[time-nuts] HP/Agilet counter 53131A (not 53151A) trigger problems

[Bernd Neubig]

Hi Azelio,

Sorry, the counters are 53131A, not 53151A. The A and B inputs are specified
from DC to 225 MHz with a sensitivity of y20 mV (rms) up to 100 MHz, <30 mV
(rms) 100 ~ 200 MHz, and <50 mV (rms) 200 ~ 225 MHz. 
The problem can be at either input alone. The problem is only in the range
between 100 MHz and <200 MHz, observed in automatic trigger mode. In manual
trigger mode the counter does not trigger at all in that freq range.

I cannot tell you an aging model for a particular OCXO, and I doubt if
anyone can ;) Aging predictions can only be made on individual OCXO, unit by
unit, and the prediction is only valid over a rather limited time. Therefore
you must continuously monitor and update your prediction.

Best regards

Bernd
DK1AG 

-----Ursprüngliche Nachricht-----
Von: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] Im
Auftrag von Azelio Boriani
Gesendet: Freitag, 24. August 2012 17:28
An: Discussion of precise time and frequency measurement
Betreff: Re: [time-nuts] HP/Agilet counter 53151A trigger problems

>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
>
> DK1AG
>
> www.axtal.com
>
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