Using an 53131A, how do I detect the condition of no input signal?

Hello

I use an Agilent 53131 A frequency counter to measure the frequency of the oscillator.  I need to be able to use the frequency counter to read the frequency when the oscillator is oscillating and indicate when the oscillator is bad (no signal present on the 53131A of entry).  Does anyone have any suggestions on the type of command I should use?

FETCH?
READ?
MEAS?

The problem I have is in the trigger.  When the oscillator is bad, the counter hangs up because she continues to wait for a trigger that will never come.

Thanks for any help

In fact you have right to the solution yourself.  You need to revise your release scheme or you can use the absence of trigger as your indication.

For example: you know that the measure will have x seconds to complete if the signal is present.  If you need to determine whether the measure is right here.  Simple if you use GPIB-

(1) set the property of VISA TMO to be as long as you wait for the measure.

(2) enable SRQ on operation completes in the meter. (ATTENTION: make sure that no other instrument allows to block Service Requestby the meter setting as low as possible address)

(3) when you send the boot command, you can query the status of the SRQ with the "wait for SRQ.vi" If no signal is present, then the wait fo SRQ will return with a time-out error.

(4) clear the error since you know what caused it and send a clear command (* CLR) at the counter to return to the idle state.

Alternatively, if the signal is present, the meter will trigger SRQ when the measurement is finished and you can then extract the memory reading.

Tags: NI Software

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