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

Said Jackson saidjack at aol.com
Sat Nov 24 23:02:21 UTC 2012


Mark,

Are you terminating the 1PPS output with 50 Ohms? They expect >1M Ohms..

Bye,
Said

Sent from my iPad

On Nov 24, 2012, at 2:42 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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