Importing examplesMaxConfig.ini causes calculated-power example acceptance test to fail

[karhin1990]

Bug Report

Importing the optional examplesMaxConfig.ini causes the calculated-power shipping example acceptance test to fail.

That configuration defines Dev1 as a PCIe-6363, while calculated_power_acq_int_clk.py uses Dev1/ai0 and Dev1/ai1 but requires a PXIe-4311. The acceptance test verifies only that Dev1 and its physical channels exist, so it runs the example without checking whether the device supports calculated-power measurements. DAQmx then returns error -200431.

Without examplesMaxConfig.ini, Dev1 is absent and the test is skipped. The test should account for required device capabilities, or the example/configuration device naming should be adjusted.

Repro or Code Sample

Refer to the Testing section on CONTRIBUTING.md. Import tests\max_config\examplesMaxConfig.ini then run poetry run pytest.

Expected Behavior

The pytest should be passing.

Current Behavior

Pytest failed with following error message:

========================================================================== FAILURES ===========================================================================
________________________________________ test___shipping_example___run___no_errors[library_init_kwargs-example_path10] ________________________________________

example_path = WindowsPath('C:/Development/nidaqmx-python/examples/analog_in/calculated_power_acq_int_clk.py')
system = <nidaqmx.system.system.System object at 0x000001CFA2CFF280>

    @pytest.mark.parametrize("example_path", EXAMPLE_PATHS)
    @pytest.mark.library_only(reason="The examples don't support gRPC.")
    def test___shipping_example___run___no_errors(example_path: Path, system):
        example_source = example_path.read_text()
        for device_name in _find_device_names(example_source):
            if device_name not in system.devices:
                pytest.skip(f"Cannot find device {device_name}.")
            device = system.devices[device_name]
            for physical_channel_name in _find_physical_channel_names(example_source, device_name):
                if not _has_physical_channel(device, physical_channel_name):
                    pytest.skip(
                        f"Device {device_name} does not have physical channel {physical_channel_name}"
                    )
        if example_path.name in ["read_freq.py", "read_pulse_freq.py"]:
            pytest.skip("Example times out if there is no signal.")
        if example_path.name in [
            "voltage_acq_int_clk_dig_start_ref.py",
            "voltage_acq_int_clk_dig_ref.py",
        ]:
            pytest.skip("Example times out if there is no trigger signal.")
        if re.search(r"\binput\(|\bKeyboardInterrupt\b", example_source):
            pytest.skip("Example waits for keyboard input.")
        if re.search(r"\bmatplotlib\b", example_source):
            pytest.skip("Example plots waveform.")
        if re.search(r"\bnptdms\b", example_source):
            pytest.skip("Example performs TDMS logging.")
        if example_path.name == "nidaqmx_warnings.py":
            # Ignore warnings from this example.
            context_manager: contextlib.AbstractContextManager = warnings.catch_warnings(record=True)
        else:
            context_manager = contextlib.nullcontext()

        with context_manager:
>           runpy.run_path(str(example_path))

tests\acceptance\test_examples.py:51:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
<frozen runpy>:291: in run_path
    ???
<frozen runpy>:98: in _run_module_code
    ???
<frozen runpy>:88: in _run_code
    ???
examples\analog_in\calculated_power_acq_int_clk.py:15: in <module>
    task.ai_channels.add_ai_calculated_power_chan(
generated\nidaqmx\task\collections\_ai_channel_collection.py:378: in add_ai_calculated_power_chan
    self._interpreter.create_ai_calculated_power_chan(
generated\nidaqmx\_library_interpreter.py:720: in create_ai_calculated_power_chan
    self.check_for_error(error_code)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

self = <nidaqmx._library_interpreter.LibraryInterpreter object at 0x000001CFA2CFFFD0>, error_code = -200431, samps_per_chan_written = None
samps_per_chan_read = None

    def check_for_error(self, error_code, samps_per_chan_written=None, samps_per_chan_read=None):
        if not error_code:
            return

        if error_code < 0:
            extended_error_info = self.get_extended_error_info()

            if samps_per_chan_read is not None:
                raise DaqReadError(extended_error_info, error_code, samps_per_chan_read)
            elif samps_per_chan_written is not None:
                raise DaqWriteError(extended_error_info, error_code, samps_per_chan_written)
            else:
>               raise DaqError(extended_error_info, error_code)
E               nidaqmx.errors.DaqError: Selected physical channel does not support the measurement type required by the virtual channel you are creating.
E
E               Create a channel of a measurement type that is supported by the physical channel, or select a physical channel that supports the measurement type.
E
E               Property: DAQmx_AI_MeasType
E               Requested Value: DAQmx_Val_Calculated_Power
E               Possible Values: DAQmx_Val_Current, DAQmx_Val_Resistance, DAQmx_Val_Strain_Gage, DAQmx_Val_Temp_BuiltInSensor, DAQmx_Val_Temp_RTD, DAQmx_Val_Temp_Thrmstr, DAQmx_Val_Temp_TC, DAQmx_Val_Voltage, DAQmx_Val_Voltage_CustomWithExcitation
E
E               Task Name: _unnamedTask<8>
E
E               Status Code: -200431

generated\nidaqmx\_library_interpreter.py:7271: DaqError

Possible Solution

Update the shipping-example acceptance test (test_examples.py) to detect calls to add_ai_calculated_power_chan and verify that the referenced device advertises UsageTypeAI.CALCULATED_POWER in device.ai_meas_types. Skip the example with a clear reason when unsupported.

device = system.devices[device_name]

if (
    "add_ai_calculated_power_chan" in example_source
    and nidaqmx.constants.UsageTypeAI.CALCULATED_POWER not in device.ai_meas_types
):
    pytest.skip(f"Device {device_name} does not support calculated power.")

This preserves Dev1 as the PCIe-6363 required by other examples while preventing calculated-power examples from running on an incompatible device.

Also, we would add a PXIe-4311 to examplesMaxConfig.ini under a recognizable name such as PXI1Slot4, then update the example to use:

voltage_physical_channel="PXI1Slot4/ai0",
current_physical_channel="PXI1Slot4/ai1",

Context

I would like to contribute to this repo, thus following the CONTRIBUTING.md to run regression test before start development.

Your Environment

• Operating system and version: Windows 11 24H2
• NI-DAQmx version: 2026 Q3
• nidaqmx-python version: 1.7.0
• Python version: 3.11.9

AB#4050189

[zhindes]

Also, we would add a PXIe-4311 to examplesMaxConfig.ini under a recognizable name such as PXI1Slot4, then update the example to use:

I agree we should do this. The example using Dev1 doesn't make sense given the only device to support that is PXI. Update the example to use a PXI name, and then update the example INI to have a device that matches that name.

Thanks!

[hongloonwong]

Fixed in #1018 . Closing this issue.