Charles P. Steinmetz wrote:
A friend just received an HP 5370B that was said to be properly
working and accurate, and asked my opinion. I'm not familiar with
these, so I thought I'd ask the experts. All we've done so far is
hook it to a Tbolt that I know is operating properly.
The 5370B took hours (8 or so, which seems like a long time for a
10811) to drift to a reasonably stable reading, a bit over 100 Hz high
(which seems like an awful lot for a 10811, even after a trip across
the country ten years since its last calibration). The front-panel
oven indicator is off; I did not notice if it was on when we first
powered it up. The 5370B reads its own oscillator within spec (< 2
mHz error; spec is +/-5 mHz). We have not opened it to tweak the
oscillator (or to verify that the 10811 is, in fact, still present).
Open the lid and check that it actually has a 10811A rather than a
simple gate oscillator.
Timing seems to work OK, giving the expected 100 nS and 50 nS figures
when I feed the internal oscillator into the start input, tie start to
stop (START COM), and switch the trigger phase of the stop channel.
Finally, the external heatsink (left rear) runs pretty darn hot --
somewhat warmer than you'd really like to leave your hand on, which is
WAY warmer than I'd ever design. Concerning (to me), but not
completely beyond reason. I suppose it could be normal for these. It
didn't burn down or shut off during the 8 hour warmup.
The heatsink does run hot.
I appreciate any input from those knowledgeable about the 5370B.
Thank you,
Charles
Bruce
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