Rex wrote:
John Miles wrote:
The procedure Bruce was describing is basically the jitter test from the
manual, at
http://cp.literature.agilent.com/litweb/pdf/05370-90031.pdf (this
is actually the same copy that David Kirkby scanned a few years ago,
hosted
by Agilent.) Follow the directions on page 3-11 and 3-12, and post the
results, especially from step 15. This jitter figure is usually well
under
50 ps in a 5370 that's working properly.
-- john, KE5FX
Bruce and John,
Thanks for pointing me back to these operator checks. I ran through
the procedures this morning and nothing seems out of spec. I guess I
just had unrealistic expectations about how stable the displays should
be while looking at that counter's own clock.
Here's my results from the Operators Checks on 3-11, 3-12:
1 - 12. Setup
13. Initial TI function: 99.59 to 99.68 nS
14. Sample 100, 99.605 to 99.618
1000, 99.603 to 99.612
10K, 99.6xx x
100K, 99.6xx x
15. STD DEV, +-TI
SS 100, 18.x to 24.x pS
MIN, -0.45 to -0.53
MAX, -0.3x
16. DSP REF 000
SET REF 99.613 nS
CLR REF 00.000
DSP EVTS 100
17. MEAN, 1, +-TI : -0.37 to -0.47 nS
PERIOD COMPLEMENT ok
18. TRIG LEV ok
19. FREQ .01S 9.999 999 9xx to 10.000 000 0x
.1S 9.999 999 99x x to 10.000 000 01x
1S 9.999 999 999 xx to 10.000 000 001 x
20. PERIOD 99.9X to 100.00 nS
21. Start/Stop Output ok
I guess all of that is in specification. Any comments appreciated.
If you have a spectrum analyzer, take a look at the 10 MHz output. If
you see 5 MHz and overtones, then there is a simple mod for you to do,
to remove them.
Also, if you feel up for it, check the multiplier chain as indicated in
the manual.
The higher resolution you have, the more digits will be affected by a
noise source...
Cheers,
Magnus
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