[time-nuts] HP/Agilet counter 53151A trigger problems

Azelio Boriani azelio.boriani at screen.it
Fri Aug 24 15:28:15 UTC 2012

>From the datasheet:
A input 10Hz..125MHz min level 25mVrms (-19dBm)
B input min 50MHz, -20dBm
the problem is on A input only? Maybe 150MHz for the A input, being beyond
the official specifications, requires more signal on one counter than the
other. In the past they all were fine?
I have read your paper on the correlation between the real and predicted
aging of crystal oscillators. I'm trying to find a suitable model for the
Morion MV201 OCXO or the Oscilloquartz 8663 to implement a Kalman filter.

On Fri, Aug 24, 2012 at 3:34 PM, Bernd Neubig <BNeubig at t-online.de> wrote:

> Hi all,
> I have several HP/Agilent frequency counters 53151A (and 53152A) in my lab.
> Several of them meanwhile show trigger problems.
> I have tested the A and B channel between 5 MHz and 200 MHZ at three input
> levels of -10 dBm, 0 dBm and +10 dBm.
> Those with trigger problems show erroneous numbers at -10 dBm input level
> rather selectively, i.e. mostly at 100 MHz, some also at 150 MHz, while the
> are o.k.
> Has anyone on this list experienced similar defects and can give a
> recommendation how to fix/repair them?
> Best regards
> Bernd
> www.axtal.com
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