[time-nuts] 5370B Question / help needed

Magnus Danielson magnus at rubidium.dyndns.org
Sun Jul 2 04:31:17 EDT 2017


In the manual there is an adjustment procedure. Have you looked at that?

DC offsets in trigger points do shift the start and stop triggers.


On 07/02/2017 12:16 AM, Thomas Allgeier wrote:
> Yes, they are both set to "positive".  Leaving the start at "pos" and
> switching the stop to "neg" gives 66 ns. One more observation, which
> probably does make sense: If I set the ARming to +/-TI and toggle the
> Period Complement the "sum" is always very close to 100ns: 15 is
> complemented by -85 and 66 by -34. All this is for Trigger Levels at Preset.
> When I "tune" the levels to get 100 ns at +TI and then switch to +/-TI I
> get around 20 ps, and the Complement button has no effect on this.
> On Sat, Jul 1, 2017 at 9:38 PM, Poul-Henning Kamp <phk at phk.freebsd.dk>
> wrote:
>> --------
>> In message <CAOT1cQJ4K8uyNvFp8AjoLGjd57Pm31LnZT_jRo44J4Zhesvgzg at mail.
>> gmail.com>, Thomas Allgeier writes:
>>> Going through the motions of measuring TI with it's own 10MHz ref as input
>>> (as described in the manual) I don't get 100 ns, but around 15 ns. So this
>>> is with the switch set to START COM. Oddly enough I get the same 15 ns
>> with
>>> the switch set to SEP, and going through a 6 ft cable between start and
>>> stop.
>> Have you checked the trigger polarities ?
>> --
>> Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
>> phk at FreeBSD.ORG         | TCP/IP since RFC 956
>> FreeBSD committer       | BSD since 4.3-tahoe
>> Never attribute to malice what can adequately be explained by incompetence.
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