USB-6361 Frequency measurement

[mkul]

Hi,

I have a USB-6361 device which have 4 counters and each counter has different terminals(like source, Gate, AUX ... ). My application is that I want to measure the frequency of a pulse train signal (0-4 volts pick to pick and also 30 ns rising/falling time) which comes from my sensor. I don't know to which terminal should I connect my sensor and also how do the frequency measurement in SignalExpress? 

Thanks

[Perry_S]

Hi mkul,

In signal express you can get the frequency by adding a step >> acquire signals>> DAQmx Acquire>> Counter input>>Frequency. Then you will specify the device that you will be using. It will then tell you which channel you will need to connect to. I hope that this helps.

Perry S.

[mkul]

Thanks Perry, when I went these steps, but there is something that I cannot do it. Like I cannot change the timeout. It is not active. also I connect my sensor to Gate of counter 0. is that right?

[Perry_S]

Hi,

The correct answer is that it depends.

To see what that PFI line corresponds to; go to measurement and automation explorer and right click on the device and select device pinouts. this will tell you if it shouls be the Gate or Source.

Regards,

Perry S.

[mkul]

Thanks Perry. I found that I need to connect my sensor to GATE terminal. now when I try to measure the frequency, I cannot change the timeout. also when I try to change the sample rate and number of the samples it gives me error. The error number is 200284.

I attache two snapshot of my configurations.

[Perry_S]

Hi mkul,

I believe the reason that you are receiving that error is because the DAQ is trying to read data that does not exist yet. So the first thing that I would try is for you to have N samples instead of continuous and also for you to start your sensor before you start your task.

Perry S.