[time-nuts] HP-3586B Tunable Voltmeter...

[Burt I. Weiner]

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" <rbenward at verizon.net>
>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.
biwa at att.net
www.biwa.cc
K6OQK