PXI 6229 pulse period measurement

[WalterLee]

Hi there,

I try to make pulse period measurement using PXI 6229 counter, I have 0.5Vcc according to DMM and 1.05V peak2peak based on scope. Then, I connected 0.5Vcc (incoming pulses) into SCB68 pin 3 and GND pin 55. I used the DAQ assistant to perform measurement n the setting for Signal Input range is min= 1ms and max = 23ms, those values I got it from scope i.e pulse period. I set it to the Rising and Acquisition Mode to 1 sample(on demand). But, I can’t get the measured values and I have no ideal why?

Please help

Walter.

[Daniel_Fulop]

Hi Walter,

the counter input of the PXI-6229 accepts standard TTL digital signals. You can find its specifications in this document.

I will repeat the relevant parts here:

Input high voltage: Min: 2.2 V; Max: 5.25 V

Input low voltage: Min: 0 V; Max: 0.8 V

If I'm correct, your signal does not meet these specifications, so in this case you will have to connect the signal to an analog input and measure the pulse width as if it was an analog signal.

Daniel