diff --git a/python/lsst/ts/observatory/control/__init__.py b/python/lsst/ts/observatory/control/__init__.py
index 608af791..709bb15a 100644
--- a/python/lsst/ts/observatory/control/__init__.py
+++ b/python/lsst/ts/observatory/control/__init__.py
@@ -20,6 +20,7 @@
 # along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
 from .base_camera import *
+from .base_calsys import *
 from .base_tcs import *
 from .remote_group import *
 from .utils import *
diff --git a/python/lsst/ts/observatory/control/auxtel/__init__.py b/python/lsst/ts/observatory/control/auxtel/__init__.py
index 53caf194..09ab2148 100644
--- a/python/lsst/ts/observatory/control/auxtel/__init__.py
+++ b/python/lsst/ts/observatory/control/auxtel/__init__.py
@@ -23,3 +23,4 @@
 from .atqueue import *
 from .calsys import *
 from .latiss import *
+from .atcalsys import *
diff --git a/python/lsst/ts/observatory/control/auxtel/atcalsys.py b/python/lsst/ts/observatory/control/auxtel/atcalsys.py
new file mode 100644
index 00000000..01d0a467
--- /dev/null
+++ b/python/lsst/ts/observatory/control/auxtel/atcalsys.py
@@ -0,0 +1,508 @@
+__all__ = ["ATSpectrographSlits", "ATCalibrationSequenceStep", "ATCalsys"]
+
+import asyncio
+from collections.abc import Awaitable
+from dataclasses import dataclass
+from datetime import datetime
+from typing import List, NamedTuple, Optional
+
+import astropy.units as un
+from astropy.units import Quantity
+from lsst.ts import salobj
+from lsst.ts.idl.enums import ATMonochromator, ATWhiteLight
+
+from ..base_calsys import (
+    BaseCalsys,
+    CalibrationSequenceStepBase,
+    CalsysScriptIntention,
+    HardcodeCalsysThroughput,
+    _calsys_get_parameter,
+)
+
+
+class ATSpectrographSlits(NamedTuple):
+    FRONTENTRANCE: float
+    FRONTEXIT: float
+
+
+@dataclass
+class ATCalibrationSequenceStep(CalibrationSequenceStepBase):
+    grating: ATMonochromator.Grating
+    latiss_filter: str
+    latiss_grating: str
+    entrance_slit_width: float
+    exit_slit_width: float
+    fs_exp_time: float
+    fs_n_exp: int
+    em_exp_time: float
+    em_n_exp: int
+
+
+class ATCalsys(BaseCalsys, HardcodeCalsysThroughput):
+    """class which specifically handles the calibration system for auxtel."""
+
+    _AT_SAL_COMPONENTS: List[str] = [
+        "ATMonochromator",
+        "FiberSpectrograph",
+        "Electrometer",
+        "ATWhiteLight",
+    ]
+    CHANGE_GRATING_TIME: Quantity[un.physical.time] = 60 << un.s
+
+    # these below numbers should be able to be loaded from a
+    # (fairly static) config!
+    GRATING_CHANGEOVER_WL: Quantity[un.physical.length] = 532.0 << un.nm
+    GRATING_CHANGEOVER_BW: Quantity[un.physical.length] = (
+        55.0 << un.nm
+    )  # WARNING! PLACEHOLDER VALUE!!!
+
+    CHILLER_COOLDOWN_TIMEOUT: Quantity[un.physical.time] = 15 << un.min
+    CHILLER_SETPOINT_TEMP: Quantity[un.physical.temperature] = 20 << un.deg_C
+    CHILLER_TEMP_REL_TOL: float = 0.2
+
+    WHITELIGHT_POWER: Quantity[un.physical.power] = 910 << un.W
+    WHITELIGHT_LAMP_WARMUP_TIMEOUT: Quantity[un.physical.time] = 15 << un.min
+
+    SHUTTER_OPEN_TIMEOUT: Quantity[un.physical.time] = 15 << un.min
+    CAL_PROGRAM_NAME: str = "AT_flats"
+
+    def __init__(self, intention: CalsysScriptIntention, **kwargs):
+        """ Initialise the ATCalsys System
+
+        Parameters
+        ----------
+        intention: CalsysScriptIntention
+            An instance of CalsysScriptIntention that tells us what the script will be doing
+            this allows us to customise the various manipulation routines of the calibration system
+
+        """ 
+        super().__init__(intention, components=self._AT_SAL_COMPONENTS, **kwargs)
+
+        # instance variables we'll set later
+        self._specsposure_time: Optional[float] = None
+        self._elecsposure_time: Optional[float] = None
+        self._n_spec_exps: Optional[int] = None
+        self._n_elec_exps: Optional[int] = None
+
+    async def setup_for_wavelength(
+        self, wavelen: float, nelec: float, spectral_res: float, **override_kwargs
+    ) -> None:
+        """Set up the calibration system for running flats of a particular wavelength
+
+        Parameters
+        ----------
+        wavelen : float
+            the wavelength to setup for (in nm)
+        nelec : float
+            the tarket number of electrons for flat exposure (in kelec)
+        spectral_res : float
+            the target spectral resolution
+        **override_kwargs : FIXME: Add type.
+            keyword arguments passed in here will be forwarded to `_calss_get_parameter`
+
+        """
+
+        grating = _calsys_get_parameter(
+            override_kwargs,
+            "grating",
+            self.calculate_grating_type,
+            wavelen,
+            spectral_res,
+        )
+        slit_widths = _calsys_get_parameter(
+            override_kwargs,
+            "slit_widths",
+            self.calculate_slit_width,
+            wavelen,
+            spectral_res,
+            grating,
+        )
+        self.log.debug(
+            f"setting up monochromtor with wavlength {wavelen} nm and spectral resolution {spectral_res}"
+        )
+        self.log.debug(f"calculated slit widthsare {slit_widths}")
+        self.log.debug(f"calculated grating is {grating}")
+
+        monoch_fut = self._sal_cmd(
+            self.ATMonochromator,
+            "updateMonochromatorSetup",
+            gratingType=grating,
+            frontExitSlitWidth=slit_widths.FRONTEXIT,
+            frontEntranceSlitWdth=slit_widths.FRONTENTRACE,
+            wavelength=wavelen,
+        )
+
+        elect_fut = self._sal_cmd(self.Electrometer, "performZeroCalib")
+        elect_fut2 = self._sal_cmd(
+            self.Electrometer,
+            "setDigitalFilter",
+            activateFilter=False,
+            activateAvgFilter=False,
+            activateMedFilter=False,
+        )
+
+        await asyncio.wait(
+            [monoch_fut, elect_fut, elect_fut2], return_when=asyncio.ALL_COMPLETED
+        )
+        self.log.debug("all SAL setup commands returned")
+        self._specsposure_time = _calsys_get_parameter(
+            override_kwargs,
+            "specsposure_time",
+            self.spectrograph_exposure_time_for_nelectrons,
+            nelec,
+        )
+        self._elecsposure_time = _calsys_get_parameter(
+            override_kwargs,
+            "elecsposure_time",
+            self.pd_exposure_time_for_nelectrons,
+            nelec,
+        )
+        self._n_spec_exps = _calsys_get_parameter(
+            override_kwargs,
+            "n_spec_exps",
+            self.spectrograph_n_exps_for_nelectrons,
+            nelec,
+        )
+        self._n_elec_exps = _calsys_get_parameter(
+            override_kwargs, "n_elec_exps", self.pd_n_exps_for_nelectrons, nelec
+        )
+
+    def calculate_slit_width(self, wavelen: float, spectral_res: float,
+                             grating: Optional[ATMonochromator.GRATING] = None
+                             ) -> Optional[ATSpectrographSlits]:
+        """Calculate the slit width needed to achieve given spectral resolution.
+        NOTE: DO NOT USE! No calibration data available here yet!
+
+        The fiber spectrograph output slit widths control the spectral bandwidth
+        of the flat fields. This function converts a targeted spectral resolution
+        into a slit width setting
+
+        Parameters
+        ----------
+        wavelen : float
+            the central wavelength of the spectrum (in units of nm)
+        spectral_res : float
+            the desired FWHM bandwidth of the spectrum (in units of nm)
+        grating : Optional[ATMonochromator.GRATING]
+            which grating to use - see ts enums. If not supplied, will be
+            calculated using `calculate_grating_type`
+
+        Returns
+        -------
+        Optional[ATSpectrographSlits]
+            FIXME: Add docs.
+
+        Raises
+        ------
+        NotImplementedError
+            FIXME: Add docs.
+
+        """
+
+        if grating is None:
+            grating = self.calculate_grating_type(wavelen, spectral_res)
+        raise NotImplementedError(
+            "calculation of slit widths not available yet, override in script parameters!"
+        )
+
+    def calculate_grating_type(
+        self, wavelen: float, spectral_res: float
+    ) -> ATMonochromator.Grating:
+        # TODO: placeholder logic, in particular the exact numbers will be WRONG!
+        # likely something like the below
+        if spectral_res > self.GRATING_CHANGEOVER_BW:
+            return ATMonochromator.Grating.MIRROR
+        elif wavelen < self.GRATING_CHANGEOVER_WL:
+            return ATMonochromator.Grating.BLUE
+        return ATMonochromator.Grating.RED
+
+    async def _electrometer_expose(self) -> Awaitable[list[str]]:
+        """begin an exposure of the electrometer subsystem
+
+        the electrometer scan is immediately started on calling this function,
+        after coroutine suspension the caller may at a later point await
+        the result. See documentation for BaseCalsys._cal_expose_helper for
+        details.
+
+        Returns
+        -------
+        Awaitable[list[str]] deferred result of the electormeter exposure
+        """
+
+        assert self._n_elec_exps is not None
+        assert self._elecsposure_time is not None
+        return self._cal_expose_helper(
+            self.Electrometer,
+            self._n_elec_exps,
+            "startScanDt",
+            scanDuration=self._elecsposure_time,
+        )
+
+    async def _spectrograph_expose(self) -> Awaitable[list[str]]:
+        assert self._n_spec_exps is not None
+        assert self._specsposure_time is not None
+
+        return self._cal_expose_helper(
+            self.ATSpectrograph,
+            self._n_spec_exps,
+            "expose",
+            numExposures=1,
+            duration=self._specsposure_time,
+        )
+
+    @property
+    def _electrometer_object(self):
+        return self.Electrometer
+
+    @property
+    def script_time_estimate_s(self) -> float:
+        """Property that returns the estimated time for the script to run in units of seconds.
+
+        For script time estimation purposes.
+        For now just returns a default long time
+        """
+        match (self._intention):
+            case CalsysScriptIntention.POWER_ON | CalsysScriptIntention.POWER_OFF:
+                # for now just use fixed values from previous script
+                # start out with chiller time maximum
+                total_time: Quantity[un.physical.time] = self.CHILLER_COOLDOWN_TIMEOUT
+                # add on the lamp warmup timeout
+                total_time += self.WHITELIGHT_LAMP_WARMUP_TIMEOUT
+                total_time += self.SHUTTER_OPEN_TIMEOUT
+                return total_time.to(un.s).value
+            case _:
+                raise NotImplementedError(
+                    "don't know how to handle this script intention"
+                )
+
+    async def power_sequence_run(self, scriptobj: salobj.BaseScript, **kwargs) -> None:
+        """Run a power sequence operation
+
+         A power sequence operation is, for example, turning on or off the calibration
+        system preparing for daily calibration runs. The sequence run depends
+        on the indicated intention of the current SAL script
+        """
+        match (self._intention):
+            case CalsysScriptIntention.POWER_ON:
+                await self._chiller_power(True)
+                await scriptobj.checkpoint("Chiller started")
+                chiller_start, chiller_end = await self._chiller_settle()
+                self.log_event_timings(
+                    self.log,
+                    "chiller cooldown time",
+                    chiller_start,
+                    chiller_end,
+                    self.CHILLER_COOLDOWN_TIMEOUT,
+                )
+
+                await scriptobj.checkpoint("Chiller setpoint temperature reached")
+                shutter_wait_fut = asyncio.create_task(
+                    self._lamp_power(True), name="lamp_start_shutter_open"
+                )
+                lamp_settle_fut = asyncio.create_task(
+                    self._lamp_settle(True), name="lamp_power_settle"
+                )
+                shutter_start, shutter_end = await shutter_wait_fut
+                self.log_event_timings(
+                    self.log,
+                    "shutter open time",
+                    shutter_start,
+                    shutter_end,
+                    self.SHUTTER_OPEN_TIMEOUT,
+                )
+
+                await scriptobj.checkpoint("shutter open and lamp started")
+                lamp_settle_start, lamp_settle_end = await lamp_settle_fut
+                self.log_event_timings(
+                    self.log,
+                    "lamp warm up",
+                    lamp_settle_start,
+                    lamp_settle_end,
+                    self.WHITELIGHT_LAMP_WARMUP_TIMEOUT,
+                )
+                self.log.info("lamp is warmed up, ATCalsys is powered on and ready")
+
+            case CalsysScriptIntention.POWER_OFF:
+                await self._lamp_power(False)
+                await scriptobj.checkpoint(
+                    "lamp commanded off and shutter commanded closed"
+                )
+                shutter_wait_fut = asyncio.create_task(
+                    self._lamp_power(False), name="lamp stop shutter close"
+                )
+                lamp_settle_fut = asyncio.create_task(
+                    self._lamp_settle(False), name="lamp power settle"
+                )
+
+                shutter_start, shutter_end = await shutter_wait_fut
+                self.log_event_timings(
+                    self.log,
+                    "shutter close",
+                    shutter_start,
+                    shutter_end,
+                    self.SHUTTER_OPEN_TIMEOUT,
+                )
+                await scriptobj.checkpoint("shutter closed annd lamp turned off")
+                lamp_settle_start, lamp_settle_end = await lamp_settle_fut
+                self.log_event_timings(
+                    self.log,
+                    "lamp cooldown",
+                    lamp_settle_start,
+                    lamp_settle_end,
+                    self.WHITELIGHT_LAMP_WARMUP_TIMEOUT,
+                )
+                await scriptobj.checkpoint("lamp has cooled down")
+                await self._chiller_power(False)
+                self.log.info("chiller has been turned off, ATCalsys is powered down")
+
+            case _:
+                raise NotImplementedError(
+                    "don't know how to handle this script intention"
+                )
+
+    async def validate_hardware_status_for_acquisition(self) -> Awaitable[bool]:
+        """Calibration system readiness check.
+
+        Check whether the calibration system hardware is nominally ready to perform
+        calibration data acquisition runs
+        """
+        shutter_fut = self._sal_waitevent(self.ATWhiteLight, "shutterState")
+        lamp_fut = self._sal_waitevent(self.ATWhiteLight, "lampState")
+
+        shutter_state = await shutter_fut
+        if shutter_state.commandedState != ATWhiteLight.ShutterState.OPEN:
+            errmsg = f"shutter has not been commanded to open, likely a programming error. \
+            Commanded state is {repr(shutter_state.commandedState)}"
+            self.log.error(errmsg)
+            raise RuntimeError(errmsg)
+
+        if shutter_state.actualState != ATWhiteLight.ShutterState.OPEN:
+            errmsg = f"shutter is not open, its state is reported as {repr(shutter_state.actualState)}"
+            self.log.error(errmsg)
+            raise RuntimeError(errmsg)
+
+        lamp_state = await lamp_fut
+        if lamp_state.basicState != ATWhiteLight.LampBasicState.ON:
+            errmsg = f"lamp state is not on, its state is reported as {repr(lamp_state.basicState)}"
+            self.log.error(errmsg)
+            raise RuntimeError(errmsg)
+
+        if not lamp_state.lightDetected:
+            self.log.warning(
+                "all states seem fine, but lamp is not reporting light detected!"
+            )
+
+    def _chiller_temp_check(self, temps) -> bool:
+        """Validate the operating temperature of the calibration system chiller"""
+        self.log.debug(
+            f"Chiller supply temperature: {temps.supplyTemperature:0.1f} C "
+            f"[set:{temps.setTemperature} deg]."
+        )
+        pct_dev: float = (
+            temps.supplyTemperature - temps.setTemperature
+        ) / temps.setTemperature
+
+        if pct_dev <= self.CHILLER_TEMP_REL_TOL:
+            self.log.info(
+                f"Chiller reached target temperature, {temps.supplyTemperature:0.1f} deg "
+            )
+            return True
+        return False
+
+    async def _chiller_power(self, onoff: bool) -> None:
+        """Start or stop the power of the calibration system chiller"""
+        cmd_target = "startChiller" if onoff else "stopChiller"
+        if onoff:
+            chiller_setpoint_temp: float = self.CHILLER_SETPOINT_TEMP.to(un.s).value
+            await self._sal_cmd(
+                self.ATWhiteLight,
+                "setChillerTemperature",
+                temperature=chiller_setpoint_temp,
+            )
+        await self._sal_cmd(self.ATWhiteLight, cmd_target)
+
+    async def _chiller_settle(self) -> Awaitable[tuple[datetime, datetime]]:
+        """Wait for the calibration system chiller temperature to settle"""
+        chiller_wait_timeout: float = self.CHILLER_COOLDOWN_TIMEOUT.to(un.s).value
+        chiller_temp_gen = self._sal_telem_gen(self.ATWhiteLight, "chillerTemperatures")
+
+        return self._long_wait_err_handle(
+            chiller_temp_gen,
+            chiller_wait_timeout,
+            self._chiller_temp_check,
+            "chiller temperature range settle",
+        )
+
+    async def _lamp_power(self, onoff: bool) -> Awaitable[bool]:
+        """Control the shutter and the lamp power of the calibration system"""
+        shutter_cmd_target = "openShutter" if onoff else "closeShutter"
+        lamp_cmd_target = "turnLampOn" if onoff else "turnLampOff"
+        # TODO: do we want asserts etc here to check the lamp state is correct first?
+        # first, open the shutter
+        shutter_task = self._sal_cmd(
+            self.ATWhiteLight, shutter_cmd_target, run_immediate=False
+        )
+
+        # now start the lamp
+        lamp_start_task = self._sal_cmd(
+            self.ATWhiteLight,
+            lamp_cmd_target,
+            run_immediate=False,
+            power=self.WHITELIGHT_POWER,
+        )
+
+        timeout = self.CMD_TIMEOUT.to(un.s)
+        await asyncio.wait(
+            [shutter_task, lamp_start_task],
+            timeout=timeout,
+            return_when=asyncio.FIRST_EXCEPTION,
+        )
+
+        # now run long wait for shutter
+        shutter_evt_gen = self._sal_evt_gen(self.ATWhiteLight, "shutterState")
+        shutter_wait_timeout: float = self.SHUTTER_OPEN_TIMEOUT.to(un.s).value
+
+        # TODO: also probably bail out if this reports an unexpected state
+        def shutter_verify(evt):
+            return evt.actualState == evt.commandedState
+
+        # TODO: this can be smarter, lamp reports time when it will be warm,
+        # can use this to update scripts etc
+        return self._long_wait_err_handle(
+            shutter_evt_gen, shutter_wait_timeout, shutter_verify, "shutter state"
+        )
+
+    async def _lamp_settle(self, onoff: bool) -> Awaitable:
+        """Wait for the lamp power to settle after a power on / off event"""
+        lamp_evt_gen = self._sal_evt_gen(self.ATWhiteLight, "lampState")
+        lamp_settle_timeout: float = self.WHITELIGHT_LAMP_WARMUP_TIMEOUT.to(un.s).value
+        lamp_tgt_state = (
+            ATWhiteLight.LampBasicState.On if onoff else ATWhiteLight.LampBasicState.Off
+        )
+        lamp_transition_name = "lamp warming up" if onoff else "lamp cooling down"
+
+        def lamp_verify(evt):
+            nonlocal lamp_tgt_state
+            return evt.basicState == lamp_tgt_state
+
+        return self._long_wait_err_handle(
+            lamp_evt_gen, lamp_settle_timeout, lamp_verify, lamp_transition_name
+        )
+
+    async def take_calibration_data(self) -> dict[str, list[str]]:
+        """Take the calibration data (i.e. the elecrometer and spectrometer data).
+        NOTE: explicitly does NOT take the LATISS flats, those should be handled separately
+        by the calling script """
+        spec_fut = self._spectrograph_expose()
+        elec_fut = self._electrometer_expose()
+
+        spec_results, elec_results = await asyncio.gather(spec_fut, elec_fut)
+        return {"spectrometer_urls": spec_results, "electrometer_urls": elec_results}
+
+    @property
+    def program_reason(self) -> str:
+        return "AT_flats"
+
+    @property
+    def program_note(self) -> str:
+        return "TODO"
diff --git a/python/lsst/ts/observatory/control/base_calsys.py b/python/lsst/ts/observatory/control/base_calsys.py
new file mode 100644
index 00000000..812ec6f2
--- /dev/null
+++ b/python/lsst/ts/observatory/control/base_calsys.py
@@ -0,0 +1,601 @@
+# This file is part of ts_observatory_control.
+#
+# Developed for the Vera Rubin Observatory Telescope and Site Systems.
+# This product includes software developed by the LSST Project
+# (https://www.lsst.org).
+# See the COPYRIGHT file at the top-level directory of this distribution
+# for details of code ownership.
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+
+__all__ = ["CalsysScriptIntention", "CalsysThroughputCalculationMixin", "BaseCalsys"]
+
+
+import asyncio
+import csv
+import enum
+import logging
+from abc import ABCMeta, abstractmethod
+from collections.abc import AsyncGenerator, Callable, Coroutine
+from datetime import datetime
+from functools import reduce
+from importlib.resources import files
+from itertools import count
+from typing import (
+    Any,
+    Awaitable,
+    Mapping,
+    Optional,
+    Sequence,
+    TypeAlias,
+    TypeVar,
+    Union,
+)
+
+import astropy.units as un
+from astropy.units import Quantity, ampere, nm, watt
+from lsst.ts import salobj
+from lsst.ts.idl.enums import Electrometer
+from scipy.interpolate import InterpolatedUnivariateSpline
+
+from .remote_group import RemoteGroup
+
+Responsivity: TypeAlias = Quantity[ampere / watt]
+T = TypeVar("T")
+
+
+def _calsys_get_parameter(
+    indct: dict[str, T],
+    key: str,
+    factory_callable: Callable,
+    *factory_args: Any,
+    **factory_kwargs: Any,
+) -> T:
+    if indct.get(key, None) is None:
+        return factory_callable(*factory_args, **factory_kwargs)
+
+
+class CalsysScriptIntention(enum.IntEnum):
+    """Enum which indicates what a SAL script will be using the calsys for."""
+
+    TURN_ON = 0
+    TURN_OFF = 1
+    QUICK_CALIBRATION_RUN = 2
+    LONG_CALIBRATION_RUN = 3
+
+
+TaskOrCoro = Union[asyncio.Task, Coroutine]
+
+
+class CalsysThroughputCalculationMixin:
+    """Mixin class to allow pluggable source for calculation of throughputs."""
+
+    POWER_LINE_FREQUENCY = 60 / (un.s)
+
+    @abstractmethod
+    def detector_throughput(self, wavelen: float) -> float:
+        """Return calculated detector throughput.
+
+        The hroughput value will return (in appropriate units TBD) the
+        detector throughput of the particular calibration system specified in
+        the class for which this mixin class is specified as a base.
+
+        Parameters
+        ----------
+        wavelen: float - wavelength of the calibration to be performed in nm
+
+
+        Returns
+        -------
+        A value (units TBD, likely electrons per pixel per second), which can
+        be used to either determine how long to integrate the sensor for to
+        achieve a desired level of calibration field in electrons, or
+        determine how many electrons will be obtained for a specific
+        integration time
+
+        """
+
+    @abstractmethod
+    def spectrograph_throughput(self, wavelen: float, calsys_power: float) -> float:
+        """Obtain throughput expected of the fiber spectrograph of the calibration system.
+
+        To aid calculations  of total throughput
+        """
+
+    @abstractmethod
+    def radiometer_responsivity(
+        self, wavelen: Quantity[un.physical.length]
+    ) -> Responsivity:
+        """Return the responsivity of the radiometer"""
+
+    def end_to_end_throughput(self, wavelen: float, calsys_power: float) -> float:
+        # intended to be SOMETHING LIKE
+        return reduce(
+            lambda t, f: t * f(wavelen, calsys_power),
+            [
+                self.detector_throughput,
+                self.spectrograph_throughput,
+                self.radiometer_responsivity,
+            ],
+        )
+
+    def total_radiometer_exposure_time(
+        self, rad_exposure_time: Quantity[un.physical.time], nplc: float
+    ) -> Quantity[un.physical.time]:
+        # Note comm from Parker:
+        # "valid nplc values are from 0.01 to 10 (seconds)
+        if not (0.01 <= nplc <= 10.0):
+            raise ValueError(
+                f"supplied valud for nplc: {nplc} is not within allowed values 0.01 <= nplc <= 10"
+            )
+        # Note: magic numbers from communication with Parker F.
+        # To be added to electrometer CSC docs
+        rad_int_time = nplc / self.POWER_LINE_FREQUENCY
+        time_sep = (rad_int_time * 3.07) + 0.00254
+        # NOTE: is 0.00254 a metric -> imperial conversion?
+        max_exp_time = 16667 * time_sep
+        n_meas: int = rad_exposure_time / time_sep
+        total_time = n_meas * 0.01 + rad_exposure_time
+
+        if total_time > max_exp_time:
+            raise ValueError(
+                f"total exposure time {total_time} is longer than max allowed {max_exp_time}"
+            )
+
+        return total_time
+
+
+class ButlerCalsysThroughput(CalsysThroughputCalculationMixin):
+    """Calculating throughput of the calibration system backed by measurements stored in  a DM butler"""
+
+
+class HardcodeCalsysThroughput(CalsysThroughputCalculationMixin):
+    """Calculating throughput of the calibration system with hardcoded values, i.e. which can be directly imported from python code"""
+
+    BASERES: str = "lsst.ts.observatory.control.cal_curves"
+    RADIOMETER_CALFILE: str = "hamamatsu_responsivity.csv"
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self._itps: dict[str, InterpolatedUnivariateSpline] = dict()
+
+    @classmethod
+    def load_calibration_csv(cls, fname: str) -> Mapping[str, Sequence[float]]:
+        res = files(cls.BASERES).joinpath(fname)
+        with res.open("r") as f:
+            rdr = csv.DictReader(f)
+            if rdr.fieldnames is None:
+                raise ValueError("calibration curve has no fieldnames!")
+            out: dict[str, list[float]] = {k: [] for k in rdr.fieldnames}
+            for row in rdr:
+                for k, v in row.items():
+                    val: float = float(v) if len(v) > 0 else 0.0
+                    out[k].append(val)
+        return out
+
+    def _ensure_itp(
+        self, itpname: str, fname: Optional[str] = None, xaxis: Optional[str] = None,
+            yaxis: Optional[str] = None, **itpargs) -> InterpolatedUnivariateSpline:
+        """Obtain an interpolated spline from a calibration curve.
+
+        If the calibration curve has already been loaded, returns the existing spline interpolation object.
+        Otherwise, will load the calibration data from the filename supplied
+
+        Parameters
+        ----------
+        itpname : Optional[str]
+            The name from which to lookup the interpolation object.
+            When object is first loaded, will lookup an interpolation object with this name
+        fname : Optional[str]
+            The file name from which to load the calibration data.
+        xaxis : Optional[str]
+            The column name of the x-axis interpolator
+        yaxis : Optional[str]
+            The column name of the y-axis interpolator
+        **itpargs : 7
+            Arguments which will be passed through to scipy InterpolatedUnivariateSpline
+
+        Returns
+        -------
+        a scipy InterpolatedUnivariateSpline object which is callable and can be used to
+        obtain interpolated calibration values.
+        """
+
+        if itpname not in self._itps:
+            if any(_ is None for _ in [fname, xaxis, yaxis]):
+                raise ValueError("missing required value to load calibration data")
+            calres = self.load_calibration_csv(fname)
+            itp = InterpolatedUnivariateSpline(calres[xaxis], calres[yaxis], **itpargs)
+            self._itps[itpname] = itp
+        else:
+            return self._itps[itpname]
+
+    def radiometer_responsivity(self, wavelen: Quantity[un.physical.length]) -> Responsivity:
+        wlin: float = wavelen.to(nm).value
+
+        itp = self._ensure_itp(
+            "radiometer", self.RADIOMETER_CALFILE, "wavelength", "responsivity"
+        )
+
+        Rawout: float = itp(wlin)
+        return Rawout << un.ampere / un.watt
+
+    def maintel_throughput(
+        self, wavelen: Quantity[un.physical.length], filter_band: str
+    ) -> Quantity[un.dimensionless_unscaled]:
+        calfilename: str = f"calibration_tput_init_{filter_band}.csv"
+        itp = self._ensure_itp(
+            f"maintel_{filter_band}", calfilename, "Wavelength[nm]", "Throughput"
+        )
+
+        wlin: float = wavelen.to(nm).value
+        return Quantity(itp(wlin), un.dimensionless_unscaled)
+
+
+class BaseCalsys(RemoteGroup, metaclass=ABCMeta):
+    """Base class for calibration systems operation
+    """
+
+    CMD_TIMEOUT: Quantity[un.physical.time] = 30 << un.s
+    EVT_TIMEOUT: Quantity[un.physical.time] = 30 << un.s
+    TELEM_TIMEOUT: Quantity[un.physical.time] = 30 << un.s
+    CAL_PROGRAM_NAME: str = "flats"
+
+    def __init__(
+        self,
+        intention: CalsysScriptIntention,
+        components: list[str],
+        domain: Optional[salobj.domain.Domain] = None,
+        cmd_timeout: Optional[int] = 10,
+        log: Optional[logging.Logger] = None,
+    ):
+        """Construct a new BaseCalsys object
+
+        NOTE: should not generally be constructed directly by a user either interactively or in a SAL script
+
+        Parameters
+        ----------
+        intention : CalsysScriptIntention
+            Configures the general behaviour of calls according to what the script is going to do
+        components : list[str]
+            SAL components to initialize, should be overridden in daughter class
+        domain : Optional[salobj.domain.Domain]
+            DDS OpenSplice domain to use
+        cmd_timeout : Optional[int]
+            timeout (measured in seconds) for DDS OpenSplice commands
+        log : Optional[logging.Logger]
+            existing logging object
+
+        """
+        super().__init__(
+            components,
+            domain,
+            log=log,
+            intended_usage=salobj.BaseUsages.StateTransition,
+            concurrent_operation=False,
+        )  # QUESTION: is this last one true????
+
+        self._intention = intention
+
+    def _sal_cmd(
+        self, obj: salobj.Remote, cmdname: str, run_immediate: bool = True, **setargs
+    ) -> TaskOrCoro:
+        """Helper function that Runs a command on a remote SAL object
+
+        This function is mainly here to avoid a lot of boilerplate that otherwise
+        accumulates in the daughter classes
+
+        Parameters
+        ----------
+        obj : salobj.Remote
+            SAL remote object to call the command on
+        cmdname : str
+            the name of the command to call (look up in the generated XML
+            definitions for the respective CSC), excluding the conventional 'cmd_' prefix
+        run_immediate : bool
+            chooses whether to return an event-loop posted future (which is done using
+            asyncio.create_task, or whether to return an un-posted coroutine function
+
+            if True, returns the future, if False, returns the coroutine
+
+        **setargs
+            extra arguments that are passed to the SAL remote object set function
+
+        Returns
+        -------
+        TaskOrCoro
+            the packaged future or coroutine (which type depends on the value of run_immediate)
+
+        Examples
+        --------
+
+        # some function calls that get us the relevant objects, in this case an Electrometer
+        calsys: BaseCalsys = get_calsys_object()
+        salobj: sal.Remote = get_electrometer_object()
+        assert type(salobj) is Electrometer
+
+        # cal the "cmd_performZeroCalib" operation on the electrometer, returning a future,
+        with the task having already been posted to the running event loop
+
+        fut = calsys._sal_cmd(salobj, salobj, "performZeroCalib")
+
+        """
+        timeout = self.CMD_TIMEOUT.to(un.s).value
+        cmdfun: salobj.topics.RemoteCommand = getattr(obj, f"cmd_{cmdname}")
+        pkgtask = cmdfun.set_start(**setargs, timeout=timeout)
+        if run_immediate:
+            return asyncio.create_task(pkgtask)
+        return pkgtask
+
+    def _sal_waitevent(
+        self,
+        obj: salobj.Remote,
+        evtname: str,
+        run_immediate: bool = True,
+        flush: bool = True,
+        **evtargs,
+    ) -> TaskOrCoro:
+        """A helper function which waits for an event on a SAL remote object
+
+        Parameters
+        ----------
+        obj : salobj.Remote
+            SAL remote object to wait for the telemetry or event on            
+        evtname : str
+            name of the event to wait for (excluding the conventional prefix 'evt_')
+        run_immediate : bool
+            Whether to return a posted future or an un-posted coroutine,
+            see documentation for BaseCalsys._sal_cmd
+        flush : bool
+            Whether to flush the remote SALobject DDS event queue for this
+            particular event
+            (i.e. whether to definitely force wait for a new event rather than popping
+            from a queue) - see documentation for salobj.Remote
+        **evtargs : 7
+            extra arguments that get passed to the .next() method of the SAL object
+
+        Returns
+        -------
+        TaskOrCoro
+            posted future or unposted coro, according to value of run_immediate,
+            as per BaseCalsys._sal_cmd
+        """
+        timeout = self.EVT_TIMEOUT.to(un.s).value
+        cmdfun: salobj.topics.RemoteEvent = getattr(obj, f"evt_{evtname}")
+        pkgtask = cmdfun.next(timeout=timeout, flush=flush)
+        if run_immediate:
+            return asyncio.create_task(pkgtask)
+        return pkgtask
+
+    def _lfa_event(
+        self,
+        obj: salobj.Remote,
+        telname: str,
+        run_immediate: bool = True,
+        flush: bool = True,
+        **evtargs,
+    ) -> TaskOrCoro:
+        return self._sal_waitevent(
+            obj, "largeFileObjectAvailable", run_immediate, flush, **evtargs
+        )
+
+    def _sal_evt_gen(
+        self, obj: salobj.Remote, evtname: str, flush: bool = True
+    ) -> AsyncGenerator:
+        pkgtask = self._sal_waitevent(obj, evtname, run_immediate=False, flush=flush)
+
+        async def gen():
+            while True:
+                v = await pkgtask
+                yield v
+
+        return gen()
+
+    def _sal_telem_gen(self, obj: salobj.Remote, telname: str) -> AsyncGenerator:
+        timeout = self.TELEM_TIMEOUT.to(un.s).value
+        cmdfun: salobj.topics.RemoteTelemetry = getattr(obj, f"tel_{telname}")
+
+        async def gen():
+            while True:
+                v = await cmdfun.next(timeout=timeout, flush=True)
+                yield v
+
+        return gen()
+
+    def _long_wait(
+        self,
+        gen: AsyncGenerator,
+        timeout_seconds: float,
+        validate_fun: Callable[[Any], bool],
+        run_immediate: bool = True,
+    ) -> TaskOrCoro:
+        async def completer() -> None:
+            async for value in gen:
+                if validate_fun(value):
+                    return
+
+        coro = asyncio.wait_for(completer(), timeout_seconds)
+        if run_immediate:
+            return asyncio.create_task(coro)
+        return coro
+
+    async def _cal_expose_helper(
+        self, obj, n: int, cmdname: str, **extra_kwargs
+    ) -> list[str]:
+        out_urls: list[str] = []
+        for i in range(n):
+            await self._sal_cmd(obj, cmdname, **extra_kwargs)
+            lfa_obj = await self._sal_waitevent(obj, "largeFileObjectAvailable")
+            out_urls.append(lfa_obj.url)
+        return out_urls
+
+    async def _long_wait_err_handle(
+        self,
+        gen: AsyncGenerator,
+        timeout_seconds: float,
+        validate_fun: Callable[[Any], bool],
+        name_of_wait: str,
+    ) -> tuple[datetime, datetime]:
+        starttime = datetime.now()
+        try:
+            await self._long_wait(
+                gen, timeout_seconds, validate_fun, run_immediate=False
+            )
+            endtime = datetime.now()
+            return starttime, endtime
+        except TimeoutError as err:
+            nowfail = datetime.now()
+            wait_time: float = (nowfail - starttime).total_seconds()
+            self.log.error(
+                f"waited {wait_time} seconds but {name_of_wait} did not succeed"
+            )
+            raise err
+
+    @classmethod
+    def log_event_timings(
+        cls,
+        logger,
+        time_evt_name: str,
+        start_time: datetime,
+        end_time: datetime,
+        expd_duration: Quantity[un.physical.time],
+    ) -> None:
+        logstr = (
+            f"event: {time_evt_name} started at {start_time} and finished at {end_time}"
+        )
+        logger.info(logstr)
+        duration = (start_time - end_time).total_seconds() << un.s
+        logstr2 = f"the duration was: {duration}, and our timeout allowance was: {expd_duration}"
+        logger.info(logstr2)
+
+
+    def detector_exposure_time_for_nelectrons(
+        self, wavelen: Quantity[un.physical.length], nelec: float
+    ) -> float:
+        """using the appropriate mixin for obtaining calibration data on throughput,
+        will calculate and return the exposure time needed to obtain a flat field calibration of n
+        electrons at the imager specified in the class definition
+
+        Parameters
+        ----------
+        wavelen: float - wavelength (in nm??) of the intended calibration
+        nelec: float - number of electrons (probably measured in ke-??) desired in calibration field
+
+        Returns
+        -------
+        exposure time: float - time  (in seconds??) needed for the imager to obtain desired calibration field
+
+        """
+
+        # must have a way to access the calibration data
+        assert issubclass(type(self), CalsysThroughputCalculationMixin)
+        raise NotImplementedError("throughput calc for detector not implemented yet!")
+
+    def spectrograph_exposure_time_for_nelectrons(self, nelec: float) -> float:
+        raise NotImplementedError(
+            "throughput calc for spectrograph not implemented yet!"
+        )
+
+    def spectrograph_n_exps_for_nelectrons(self, nelec: float) -> int:
+        raise NotImplementedError(
+            "throughput calc for spectrograph not implemented yet!"
+        )
+
+    def pd_exposure_time_for_nelectrons(self, nelec: float) -> float:
+        raise NotImplementedError(
+            "throughput calc for electrometer not implemented yet!"
+        )
+
+    def pd_n_exps_for_nelectrons(self, nelec: float) -> int:
+        raise NotImplementedError(
+            "throughput calc for electrometer not implemented yet"
+        )
+
+    @property
+    @abstractmethod
+    def _electrometer_object(self) -> Electrometer:
+        pass
+
+    @abstractmethod
+    async def validate_hardware_status_for_acquisition(self) -> Awaitable:
+        pass
+
+    @abstractmethod
+    async def power_sequence_run(self, scriptobj, **kwargs) -> Awaitable:
+        pass
+
+    @abstractmethod
+    async def setup_for_wavelength(self, wavelen: float, **extra_params) -> None:
+        """awaitable which sets up the various remote components of a
+        calibration system to perform a calibration at a particular
+        wavelength.
+
+        Intended to be a 'high level' setup function, such that user doesn't
+        have to worry about e.g. setting up integration times for
+        spectrographs etc
+
+        Parameters
+        ----------
+        wavelen: float - desired wavelength (in nm)
+
+        extra_params: to handle things which are specific to individual
+        calibration systems (e.g that the auxtel can also adjust spectral
+        bandwidth)
+
+        """
+        pass
+
+    @abstractmethod
+    async def take_calibration_data(self):
+        """Awaitable which starts the exposures for the calibration.
+
+        instruments (i.e the spectrographs, electrometers etc) are chosen
+        according to the setup. It does not take images with the instrument
+        under test, it is intended that script components which use this class
+        do that themselves
+        """
+        pass
+
+    async def generate_data_flats(
+        self, instrobj, scriptobj, exposure_time_s: float, n_iter: Optional[int] = None
+    ):
+        """Return an async generator which yields sets of exposures from."""
+        # Run forever if n_iter was not given, don't worry it's just a generator
+        nrange = count() if n_iter is None else range(n_iter)
+
+        for i in nrange:
+            self.log.info("taking flats number %d", i)
+            instr_task = instrobj.take_flats(
+                exposure_time_s,
+                nflats=1,
+                groupid=scriptobj.group_id,
+                program=self.CAL_PROGRAM_NAME,
+                reason=self.program_reason,
+                note=self.program_note,
+            )
+            instr_fut = asyncio.create_task(instr_task)
+            aux_cal_fut = self.take_calibration_data()
+            instr_results, aux_cal_results = await asyncio.gather(
+                aux_cal_fut, instr_fut
+            )
+            yield instr_results, aux_cal_results
+
+    @property
+    @abstractmethod
+    def program_reason(self) -> str:
+        ...
+
+    @property
+    @abstractmethod
+    def program_note(self) -> str:
+        ...
diff --git a/python/lsst/ts/observatory/control/cal_curves/__init__.py b/python/lsst/ts/observatory/control/cal_curves/__init__.py
new file mode 100644
index 00000000..8b137891
--- /dev/null
+++ b/python/lsst/ts/observatory/control/cal_curves/__init__.py
@@ -0,0 +1 @@
+
diff --git a/python/lsst/ts/observatory/control/cal_curves/calibration_tput_init_g.csv b/python/lsst/ts/observatory/control/cal_curves/calibration_tput_init_g.csv
new file mode 100644
index 00000000..6cbcbed4
--- /dev/null
+++ b/python/lsst/ts/observatory/control/cal_curves/calibration_tput_init_g.csv
@@ -0,0 +1,807 @@
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diff --git a/python/lsst/ts/observatory/control/cal_curves/calibration_tput_init_i.csv b/python/lsst/ts/observatory/control/cal_curves/calibration_tput_init_i.csv
new file mode 100644
index 00000000..93cf1e6d
--- /dev/null
+++ b/python/lsst/ts/observatory/control/cal_curves/calibration_tput_init_i.csv
@@ -0,0 +1,807 @@
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diff --git a/python/lsst/ts/observatory/control/cal_curves/calibration_tput_init_r.csv b/python/lsst/ts/observatory/control/cal_curves/calibration_tput_init_r.csv
new file mode 100644
index 00000000..2ec0e372
--- /dev/null
+++ b/python/lsst/ts/observatory/control/cal_curves/calibration_tput_init_r.csv
@@ -0,0 +1,807 @@
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diff --git a/python/lsst/ts/observatory/control/cal_curves/calibration_tput_init_u.csv b/python/lsst/ts/observatory/control/cal_curves/calibration_tput_init_u.csv
new file mode 100644
index 00000000..aebb04f2
--- /dev/null
+++ b/python/lsst/ts/observatory/control/cal_curves/calibration_tput_init_u.csv
@@ -0,0 +1,807 @@
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diff --git a/python/lsst/ts/observatory/control/cal_curves/calibration_tput_init_y4.csv b/python/lsst/ts/observatory/control/cal_curves/calibration_tput_init_y4.csv
new file mode 100644
index 00000000..d34ed26a
--- /dev/null
+++ b/python/lsst/ts/observatory/control/cal_curves/calibration_tput_init_y4.csv
@@ -0,0 +1,807 @@
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diff --git a/python/lsst/ts/observatory/control/cal_curves/calibration_tput_init_z.csv b/python/lsst/ts/observatory/control/cal_curves/calibration_tput_init_z.csv
new file mode 100644
index 00000000..abe47ab3
--- /dev/null
+++ b/python/lsst/ts/observatory/control/cal_curves/calibration_tput_init_z.csv
@@ -0,0 +1,807 @@
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diff --git a/python/lsst/ts/observatory/control/cal_curves/hamamatsu_responsivity.csv b/python/lsst/ts/observatory/control/cal_curves/hamamatsu_responsivity.csv
new file mode 100644
index 00000000..b9237838
--- /dev/null
+++ b/python/lsst/ts/observatory/control/cal_curves/hamamatsu_responsivity.csv
@@ -0,0 +1,162 @@
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+1090,0.0985,0.3
+1095,0.0873,0.32
+1100,0.0772,0.32
diff --git a/python/lsst/ts/observatory/control/maintel/mtcalsys.py b/python/lsst/ts/observatory/control/maintel/mtcalsys.py
new file mode 100644
index 00000000..6dcce553
--- /dev/null
+++ b/python/lsst/ts/observatory/control/maintel/mtcalsys.py
@@ -0,0 +1,21 @@
+from typing import List, Optional
+from lsst.ts import salobj
+from ..base_calsys import BaseCalsys
+
+
+class MTCalsys(BaseCalsys):
+    """class which specifically handles the calibration system for maintel"""
+
+    _MT_SAL_COMPONENTS: List[str] = []  # TODO, what do we actually need here???!
+
+    def __init__(self, domain: Optional[salobj.Domain] = None):
+        super().__init__(self._MT_SAL_COMPONENTS, domain)
+
+    async def turn_on_light(self) -> None:
+        ...
+
+    async def turn_off_light(self) -> None:
+        ...
+
+    async def setup_for_wavelength(self, wavelen: float) -> None:
+        ...
diff --git a/tests/test_calsys_logic.py b/tests/test_calsys_logic.py
new file mode 100644
index 00000000..56846d0f
--- /dev/null
+++ b/tests/test_calsys_logic.py
@@ -0,0 +1,42 @@
+import typing
+import unittest
+import logging
+import pytest
+from lsst.ts import salobj
+from lsst.ts.observatory.control.utils import RemoteGroupTestCase
+from lsst.ts.observatory.control.mock.latiss_mock import LATISSMock
+from lsst.ts.observatory.control.base_calsys import HardcodeCalsysThroughput
+
+
+class TestBaseCalsysLogic(unittest.TestCase):
+    """ Test cases for the abstract calculation logic and shared functionality
+    of BaseCalsys """
+
+    def test_load_calibration(self):
+        calfile = HardcodeCalsysThroughput.load_calibration_csv("hamamatsu_responsivity.csv")
+
+        self.assertIn("wavelength", calfile)
+        self.assertIn("responsivity", calfile)
+
+    def test_interpolate(self):
+        obj = HardcodeCalsysThroughput()
+        throughput_low = obj.radiometer_throughput(875.0)
+
+
+class TestATCalsys(RemoteGroupTestCase, unittest.IsolatedAsyncioTestCase):
+    """Test cases for the ATCalsys concrete implementation """
+
+    @classmethod
+    def setUpClass(cls) -> None:
+        """set up mocks and such that we need for all the tests"""
+        
+        
+    
+    async def basic_make_group(
+            self, usage: typing.Optional[int] = None) -> typing.Iterable[typing.Union[RemoteGroup, salobj.BaseCsc]]:
+        pass
+
+    
+
+    
+