Bernd,
Do the 53131A have rear inputs? At work, we're on contract to
repair 53132As and found the rear input seriously degrades the
performance. The basic sensitivity (100-200 MHz) is 30 mVrms. The Rear
input is in parallel with the front panel and the sensitivity is 75
mVrms (full frequency range).
In auto, the counter will attempt to set the trigger level between
the positive and negative peaks. In manual mode, you need to set the
trigger level and it might be misaligned.
Mike
On 8/27/2012 12:01 PM, Bernd Neubig wrote:
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: [email protected] [mailto:[email protected]] 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 <[email protected]> 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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