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nidmm_fetch_waveform.py
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nidmm_fetch_waveform.py
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#!/usr/bin/python
import argparse
import nidmm
import sys
import time
def example(resource_name, options, function, range, points, rate):
with nidmm.Session(resource_name=resource_name, options=options) as session:
session.configure_waveform_acquisition(measurement_function=nidmm.Function[function], range=range, rate=rate, waveform_points=points)
with session.initiate():
while True:
time.sleep(0.1)
backlog, acquisition_state = session.read_status()
if acquisition_state == nidmm.AcquisitionStatus.FINISHED_WITH_NO_BACKLOG:
break
measurements = session.fetch_waveform(array_size=backlog)
print(measurements)
def _main(argsv):
parser = argparse.ArgumentParser(description='Performs a waveform acquisition using the NI-DMM API.', formatter_class=argparse.ArgumentDefaultsHelpFormatter)
parser.add_argument('-n', '--resource-name', default='PXI1Slot2', help='Resource name of an NI digital multimeter.')
parser.add_argument('-f', '--function', default='WAVEFORM_VOLTAGE', choices=nidmm.Function.__members__.keys(), type=str.upper, help='Measurement function.')
parser.add_argument('-r', '--range', default=10, type=float, help='Measurement range.')
parser.add_argument('-p', '--points', default=10, type=int, help='Specifies the number of points to acquire before the waveform acquisition completes.')
parser.add_argument('-s', '--rate', default=1000, type=int, help='Specifies the rate of the acquisition in samples per second.')
parser.add_argument('-op', '--option-string', default='', type=str, help='Option string')
args = parser.parse_args(argsv)
example(args.resource_name, args.option_string, args.function, args.range, args.points, args.rate)
def main():
_main(sys.argv[1:])
def test_example():
options = {'simulate': True, 'driver_setup': {'Model': '4082', 'BoardType': 'PXIe', }, }
example('PXI1Slot2', options, 'WAVEFORM_VOLTAGE', 10, 10, 1000)
def test_main():
cmd_line = ['--option-string', 'Simulate=1, DriverSetup=Model:4082; BoardType:PXIe', ]
_main(cmd_line)
if __name__ == '__main__':
main()