RISETIME at NI SCOPE VS. SLOPE at NIDMM(Transmeas function)

[kero06]

Hello everyone.

Just want to ask the difference between Risetime value from NISCOPE to SLOPE value from NIDMM.

My project is to replace the use of NI SCOPE with our existing NIDMM 4070 in our capacitance test with fixed 13.5Volts and regulated current at 200mA. They have different response but connected in the same supply lines.

 See below..

 niScope_FetchWaveformMeasurement (ni5124_hdl, "0", NISCOPE_VAL_RISE_TIME, &p_oszi->RiseTime);

and

TransMeas(waveform,numSamplesAcquired,ANALYSIS_HIGH,1,90.0,50.0,10.0,PERCENTAGE_LEVEL,STATE_LEVELS_PEAK,1,&dSlope,&dDUration,&dStartTime,&dEndTime,&dLowRefValue,&dMidRefValue,&dHighRefValue,&dPreUnderShoot,&dPreOverShoot,&dPostUnderShoot,&dPostOverShoot);

[rleonard3]

Hi kero06,

The niScope_FetchWaveformMeasurement function "Fetches a waveform measurement from a specific channel from a previously initiated waveform acquisition" but not the rise time information about that waveform.

http://zone.ni.com/reference/en-XX/help/370592E-01/scopefunc/niscope_fetchwaveformmeasurement/

The slope value in the TransMeas function does however give you "A measure of the rate of change of the signal in a transition region between highRefValue and lowRefValue."

http://zone.ni.com/reference/en-XX/help/370051V-01/cvi/libref/cvitransmeas/