[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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