[time-nuts] Question re 1pps output on the Z3805A

[Azelio Boriani]

Usually the PPS output from the Z-series GPSDO is a 26uS wide (from the
HP58503A datasheet) TTL pulse. To measure it you must use a fast
oscilloscope (because of the fast pulse rise time) and an analog or digital
memory (because of the very low repetition rate). The best is to use a
digital sampling 'scope and set the trigger to NORMAL.

On Sat, Nov 24, 2012 at 11:42 PM, Mark Spencer <mspencer12345 at yahoo.ca>wrote:

> Greetings.   I recently acquired two Z3805A gpsdo's from the usual auction
> site.  (These units look like a Z3801.)
>
> Does any one know the specified output level for the 1pps signals or have
> a high confidence measurement of the output voltage that they could share
> with me ?  (Measuring fast rise time signals is not really my forte and I
> don't trust my measurements of an apparent .15 volt pulse.)
>
> The status message sent from the units via RS 232 contains a TFOM ( time
> figure of merit ?) variable and I've seen that phrase used in conjunction
> with equipment that outputs a 10 volt 1 pps pulse.
>
> On a side note so far I'm pleased with the performance of the units (the
> 10 Mhz output of better of the two has a typical adev in the low 10e-12 -
> high 10e-13 range, and appears to be improving.)
>
> Thanks in advance for any comments.
>
> Regards Mark Spencer.
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