Burt,
You still need to offset the voltmeter if you intend to use it. I think
it's somewhere around 1.7dB difference.
I'm not sure I have the time to fix the "B" , but if things change, I'll
contact you for advice. I believe I have the manual.
Thanks,
Bob
----- Original Message -----
From: "Burt I. Weiner" <[email protected]>
To: <[email protected]>
Sent: Saturday, July 24, 2010 9:53 PM
Subject: [time-nuts] HP-3586B Tunable Voltmeter...
Bob,
For dBm or Volts across 50 Ohms, I normally set it for 10K bridging and
use a 50 Ohm terminating connector. 10K terminated by 50 Ohms is close to
49.75 Ohms, which is close enough for anything I need to do. I suppose if
I really needed to get accurate, I'd take a file to a 50 Ohm resistor like
we did in the good old days. I've never been sure why the 3586B always
seems to be less expensive than the A version other than possibly because
of the A being a 50 Ohm instrument.
I have a pdf service manual for the A,B & C instruments. Do you need a
copy for working on your B? What kind of problems does your B have? I've
repaired a few and have a little knowledge in repairing them.
Burt
From: "Robert Benward" <[email protected]>
Subject: Re: [time-nuts] HP-3586B receiver...
Burt
I believe the voltmeter is calibrated for 75 ohms, not 50, otherwise they
are very similar. You can apply a dB offset to correct for the
measurement
error, run the input at 10Kohms, and use a 50ohm feedthrough termination.
I own both (the B is has problems now), but I use the voltage measurement
capability extensively. The B is much cheaper on Ebay.
Bob
----- Original Message -----
From: Burt I. Weiner
Sent: Saturday, July 24, 2010 4:05 PM
Subject: [time-nuts] HP-3586B receiver...
I prefer the 3586-B version. I think it's more user friendly - once
you get the hang of it, it does more.
Burt I. Weiner Associates
Broadcast Technical Services
Glendale, California U.S.A.
[email protected]
www.biwa.cc
K6OQK
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