[time-nuts] Stanford Research SR620 Measurement Bias
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.
> -----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!
> 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"
> 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
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to
> and follow the instructions there.
More information about the time-nuts