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

[Azelio Boriani]

and, yes, if your 'scope has the 50ohm/1Mohm input capability, use the 1M
one.

On Sun, Nov 25, 2012 at 12:03 AM, Azelio Boriani
<azelio.boriani at screen.it>wrote:

> 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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>
>