[time-nuts] HP5370B - 10 sec Gatetime via GPIB
Dr. Frank Stellmach
drfrank.stellmach at freenet.de
Sun Jul 1 21:29:43 UTC 2007
Hello,
currently I'm testing frequency stability of an OCXO from NDK.
The HP5370B is in the External Holdhoff & External Arm mode.
From a pulse generator I apply a 10sec ON, 100ms OFF TTL signal to
the External BNC jack, so I get a 10 sec long gate time for averaging
jitter effects much quicker than the built-in 1sec maximum gate time.
Additionally, I send the results via GPIB to the computer for the usual
statistics on the data.
Now I tried to replace the external pulse by software.
I simulated the pulses from the generator by leaving the External jack
open, or short circuit it, and by reversing the trigger slope on that
jack (comands SE0 / SE1). This works quite fine, as the trigger LED
operates, but the counter does not produce a result, obviously because
the arming signal is reset directly by the GPIB commands.
I also tried some other additional commands, but nothing works.
Has anybody got an idea how to program the HP5370B for a gate time up to
the maximum of 10sec?
Dr. Frank Stellmach
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