[time-nuts] HP 5370B manual discrepancies

Tom Van Baak tvb at leapsecond.com
Mon Dec 13 05:01:33 EST 2004

R21 and R29 are 330R chips in the 2716A version of
the manual. I'll scan that page for you.


----- Original Message -----
From: "John Miles" <jmiles at pop.net>
To: <time-nuts at febo.com>
Sent: Monday, December 13, 2004 00:01
Subject: [time-nuts] HP 5370B manual discrepancies

> Hi, folks --
> I thought this would be a good place to see if anyone had a more
> manual for the 5370B counter than mine.  I have a 2410-series 5370B with a
> 2316-series manual plus the change notes needed to bring it up to the 2410
> level.  However, there still appear to be some differences in the input
> amplifier (A3) subassembly that aren't accounted for in the change notes.
> For instance, R56 and R57 near the input x10 attenuator switch appear to
> 330K in my counter, not 50 ohms as they are shown in the schematic.
> Does anyone have a 5370B manual that was printed after mine?  I just did
> some troubleshooting on the input signal-conditioning circuitry on mine
> that, while ultimately successful, would have gone a lot smoother if my
> manual actually reflected the circuit I was working on.  I'd be extremely
> grateful if someone with a genuine 2410 or later manual could take a scan
> that input amplifier schematic.  I'd like to update my own manual with it.
> I also have a 2610-series 5370B (parts unit), and its input amp board
> some significant differences versus the 2410 counter.  So a manual that's
> too far advanced beyond 2410 would probably not be that helpful (but still
> interesting to compare).
> Thanks es 73! -- john KE5FX
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