Hi Kurt,
The tester runs a Swept Sine Test and calculates the natural frequency and resonant rise of the DUT using the magnitude and phase data from the SweptFreqAxis MAGVIEW and UNWRPHASEVIEW. A list of custom test frequencies is used to run the test. Each station is able to run a number of different products that require different custom test frequencies, amplitudes, and number of test frequencies. When a different product is selected, the card is automatically reconfigured by the program.
As the swept sine test is run, the program polls the card to retrieve the Magnitude data so that the Magnitude plot can be drawn real-time. If real-time data retrieval is not possible, that's ok.
The test also sends a DC voltage to the DUT to determine its DC gain. However, I think this part of the test can be done using the existing DAQmx library.
These DSA functions are called :
NIDSA_init(resourceName, IDQuery, resetFlag, &DSAsession);
NIDSA_error_message(DSAsession, rc, errorMessage);
NIDSA_configure_dsa_mode(DSAsession, mode=SWPSINE_MODE);
NIDSA_configure_swept_sine_source(DSAsession, amplitude, autoLevelEnable=0, autoLevelChannel=1, idealRef=1, refLowerDeviationdB=-3, refUpperDeviationdB=3, maxLevel=10, rampingEnable=0, rampingRate=1);
NIDSA_configure_swept_sine(DSAsession, startFrequency, stopFrequency, numberOfSteps, repeat=0, linLog=1, sweepMode=2, autoMaxStep=512, fastThresholddB=1, slowThresholddB=6);
NIDSA_configure_swept_sine_custom(DSAsession, numberOfSteps, pTestFrequencies);
NIDSA_get_swept_sine_status(DSAsession, &sweepStatus, &measurementError, &overload);
NIDSA_set_input_voltage_range(DSAsession, channel, range=VRANGE_10V);
NIDSA_set_input_coupling(DSAsession, channel, coupling=COUP_DC);
NIDSA_configure_source(DSAsession, sourceOn, type);
NIDSA_configure_sine_source(DSAsession, freq1, amp1, freq2, amp2, dcOffset);
NIDSA_check_new_measurement(DSAsession, newMeasurementFlag);
NIDSA_get_measurement_length(DSAsession, type, 0, pNumMeasurements, &realOrComplex);
NIDSA_read_measurement(DSAsession, type, startIndex, numMeasurements-startIndex, view, dbState=DBON, pkrmsUnits=PEAKUNIT, phaseUnits=DEGREES, &x0, &dx, fMeasurements);
NIDSA_close(DSAsession);
The hardware setup is pretty straightforward :
Analog Ouput Ch 0 --> Amplifier IN / DUT input
Analog Input Ch 0 --> Current Probe Output / DUT current input
Analog Input Ch 1 --> Capacitance Probe Output / DUT response
Ideally, as many of the configuration and test parameters as possible would be input parameters to the dll functions so that if the config or test needs to be changed the dll doesn't need to be modified or there don't need to be multiple dll's running. At minimum, the number of test frequencies, array of custom test frequencies, and amplitude would need to be input parameters.
Thanks,
Nia
