[time-nuts] HP-3586B Tunable Voltmeter...
rbenward at verizon.net
Sun Jul 25 00:12:17 EDT 2010
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.
----- Original Message -----
From: "Burt I. Weiner" <biwa at att.net>
To: <time-nuts at febo.com>
Sent: Saturday, July 24, 2010 9:53 PM
Subject: [time-nuts] HP-3586B Tunable Voltmeter...
> 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.
>>From: "Robert Benward" <rbenward at verizon.net>
>>Subject: Re: [time-nuts] HP-3586B receiver...
>>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
>>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.
>> ----- 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
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