Adding Improve DC Noise Rejection example in NI-DMM

CHANGELOG.md

@@ -799,6 +799,7 @@
 #### [nidmm] Unreleased
 - Added
   - Added the `nidmm_measure_ac_volts.py` example.
+  - Added the `nidmm_improve_dc_noise_rejection.py` example.
   - Added the `nidmm_diode_test.py` example.
   - Added the `nidmm_measure_capacitance.py` example.
   - Added the `nidmm_measure_temperature_rtd.py` example.

docs/nidmm/examples.rst

@@ -21,6 +21,15 @@ nidmm_fetch_waveform.py
    :encoding: utf8
    :caption: `(nidmm_fetch_waveform.py) <https://github.com/ni/nimi-python/blob/master/src/nidmm/examples/nidmm_fetch_waveform.py>`_
 
+nidmm_improve_dc_noise_rejection.py
+-----------------------------------
+
+.. literalinclude:: ../../src/nidmm/examples/nidmm_improve_dc_noise_rejection.py
+   :language: python
+   :linenos:
+   :encoding: utf8
+   :caption: `(nidmm_improve_dc_noise_rejection.py) <https://github.com/ni/nimi-python/blob/master/src/nidmm/examples/nidmm_improve_dc_noise_rejection.py>`_
+
 nidmm_measure_ac_volts.py
 -------------------------
 

src/nidmm/examples/nidmm_improve_dc_noise_rejection.py

@@ -0,0 +1,58 @@
+#!/usr/bin/python
+
+import argparse
+import nidmm
+import sys
+
+
+def example(resource_name, options, range, digits, aperture_time, dc_noise_rejection, sample_count, auto_zero, number_of_averages):
+    with nidmm.Session(resource_name=resource_name, options=options) as session:
+        session.configure_measurement_digits(measurement_function=nidmm.Function.DC_VOLTS, range=range, resolution_digits=digits)
+        session.configure_multi_point(trigger_count=1, sample_count=sample_count)
+        # For aperture times over 100 ms, enable Auto Zero to compensate for drift.
+        session.auto_zero = nidmm.AutoZero[auto_zero]
+        session.aperture_time_units = nidmm.ApertureTimeUnits.SECONDS
+        # To reject noise at frequency f, choose the aperture time based on the weighting mode:
+        # NORMAL: a multiple of 1/f; SECOND_ORDER: a multiple of 2/f;
+        # HIGH_ORDER: at least 4/f, with no benefit to going above 4.5/f.
+        session.aperture_time = aperture_time
+        # NORMAL weighs all samples equally; SECOND_ORDER and HIGH_ORDER weigh samples in the middle of the aperture more.
+        session.dc_noise_rejection = nidmm.DCNoiseRejection[dc_noise_rejection]
+        # The DMM averages shorter measurements to produce each returned reading.
+        session.number_of_averages = number_of_averages
+        measurements = session.read_multi_point(array_size=sample_count)
+        print(f'Measurements for {sample_count} Samples: {measurements}')
+
+
+def _main(argsv):
+    supported_noise_rejection_modes = list(nidmm.DCNoiseRejection.__members__.keys())
+    parser = argparse.ArgumentParser(description='Performs a multipoint DC voltage measurement with configurable DC noise rejection.', formatter_class=argparse.ArgumentDefaultsHelpFormatter)
+    parser.add_argument('-n', '--resource-name', default='PXI1Slot2', help='Contains the resource_name of the device to initialize.')
+    parser.add_argument('-op', '--option-string', default='', type=str, help='Sets the initial value of certain attributes for the session.')
+    parser.add_argument('-r', '--range', default=0.1, type=float, help='Specifies the range for the function specified in the Measurement_Function parameter.')
+    parser.add_argument('-d', '--digits', default=6.5, type=float, help='Specifies the resolution of the measurement in digits.')
+    parser.add_argument('--auto-zero', default='OFF', choices=nidmm.AutoZero.__members__.keys(), type=str.upper, help='Specifies the Auto Zero mode.')
+    parser.add_argument('-a', '--aperture-time', default=0.1, type=float, help='Specifies the measurement aperture time for the current configuration, in seconds.')
+    parser.add_argument('--dc-noise-rejection', default='NORMAL', choices=supported_noise_rejection_modes, type=str.upper, help='Specifies the DC noise rejection mode.')
+    parser.add_argument('-s', '--sample-count', default=10, type=int, help='Specifies the number of measurements the DMM takes each time it receives a trigger in a multiple point acquisition.')
+    parser.add_argument('--number-of-averages', default=8, type=int, help='Specifies the number of averages to perform in a measurement.')
+    args = parser.parse_args(argsv)
+    example(args.resource_name, args.option_string, args.range, args.digits, args.aperture_time, args.dc_noise_rejection, args.sample_count, args.auto_zero, args.number_of_averages)
+
+
+def main():
+    _main(sys.argv[1:])
+
+
+def test_example():
+    options = {'simulate': True, 'driver_setup': {'Model': '4082', 'BoardType': 'PXIe', }, }
+    example('PXI1Slot2', options, 0.1, 6.5, 0.1, 'NORMAL', 10, 'OFF', 8)
+
+
+def test_main():
+    cmd_line = ['--option-string', 'Simulate=1, DriverSetup=Model:4082; BoardType:PXIe', ]
+    _main(cmd_line)
+
+
+if __name__ == '__main__':
+    main()