[time-nuts] Stanford Research SR620 Measurement Bias

Ulrich Bangert df6jb at ulrich-bangert.de
Mon Sep 28 14:22:04 UTC 2009


I believe I made it with calbyte 4 as described on page 71 of the manual.

Best regards

> -----Ursprungliche Nachricht-----
> Von: time-nuts-bounces at febo.com 
> [mailto:time-nuts-bounces at febo.com] Im Auftrag von Stan
> Gesendet: Montag, 28. September 2009 14:46
> An: time-nuts at febo.com
> Betreff: Re: [time-nuts] Stanford Research SR620 Measurement Bias
> Hi Ulrich,
> Thanks for the insight! I tried manually adjusting the value 
> of CalByte 50 (as per Magnus' suggestion), but it did not 
> make the problem go away. There is interaction between this 
> adjustment and the CalByte 4 adjustment for timebase 
> accuracy, and when all was said and done, I didn't notice any 
> significant difference in the offset. 
> Where in the manual does it describe the procedure to 
> minimize the bias? It's definitely not where I would have 
> expected it to be!
> Regards,
> Stan
> Message: 1
> Date: Mon, 28 Sep 2009 09:08:21 +0200
> From: "Ulrich Bangert" <df6jb at ulrich-bangert.de>
> Subject: Re: [time-nuts] Stanford Research SR620 Measurement Bias
> To: "'Discussion of precise time and frequency measurement'"
> 	<time-nuts at febo.com>
> Message-ID: <A4D0A2A6239B4798AB28E7193A646291 at athlon>
> Content-Type: text/plain;	charset="us-ascii"
> Stan,
> I own a SR620 as well and mine behaves the same (while with a 
> different number of "counts") so your's is surely not 
> defective! My understanding a few years ago when I acquired 
> the counter was that this bias is not due to a "adjustment" 
> in the normal sense but to set a parameter in the counter's 
> eeprom to a correct value. Since this parameter is limited to 
> a certain precisison you can make some effort in minimizing 
> this bias but you should not expect to make it exactly zero. 
> The manual explains how to do but you do not find the 
> procedure where you would have expected it.
> Best regards
> Ulrich Bangert
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