[time-nuts] another Ebay mixup, 5370
jmiles at pop.net
Sun Jun 10 15:13:20 EDT 2007
The readings were taken with the level controls in PRESET, START 50 OHMS,
x1, DC, positive slope, START COM enabled. Mode was +/- TI.
Again, though, until I get the chance to go through the whole thing with my
8082A, I wouldn't take any of these numbers to the bank. It's possible that
the differences between the INT and EXT results are solely due to
miscalibration. All they really prove is that levels and waveshapes need to
be matched carefully when comparing different counters and/or test
-- john, KE5FX
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com]On
> Behalf Of Tom Van Baak
> Sent: Sunday, June 10, 2007 1:20 AM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] another Ebay mixup, 5370
> > Measurements taken from 3325B at 1 MHz:
> > 5370B reference: INT EXT (same 5087A as 3325B uses)
> > Square wave, 2v pk: 15-20 ps 11-12 ps
> > Sine wave, 2v pk: 50-70 ps 30-35 ps
> > Square wave, 1v pk: 20-25 ps 12-13 ps
> > Sine wave, 1v pk: 60-80 ps 40-45 ps
> > Square wave, .1v pk: 40-60 ps 40-45 ps
> > Sine wave, .1v pk: 600-900 ps 500-600 ps
> > -- john, KE5FX
> Very nice data. Thanks for staying up late to make the measurements.
> What trigger levels and input configuration did you use for this?
> Based on these results can someone calculate how much jitter is
> due to the 5370B input circuits alone and how much is due to the
> rest of the circuitry of the unit?
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