[time-nuts] (no subject) - HP 5065A

Jim/Anna McIntyre bbimini at gmail.com
Mon Dec 7 23:03:53 EST 2015


Well, no breakthroughs to report.  I started by looking at A8 (the Phase
Detector/274 Hz oscillator).  It seems to be OK, but has no 137 Hz error
signal coming in from the A7 amplifier.  The A7 amp seems OK, at least it
passes the 'Quick Check' mentioned in the service manual. (That consists of
looking at the A7 output and touching the input pin with a metal tool to
induce some 60Hz hum).

I do see some 2nd harmonic indication on the meter, but it's pretty
sporadic - and very vibration sensitive.  If I tap on the RVFR, the meter
will swing upscale.  But is soon drops back to zero.  Normal?  Or a clue as
to what's wrong?

I usually see nothing at A7 TP1, but if I tap on the RVFR I get bursts of
noise.  Other components are somewhat microphonic too, but the RVFR seems
to be the most sensitive.







On Mon, Dec 7, 2015 at 12:21 PM, Jim/Anna McIntyre <bbimini at gmail.com>
wrote:

> Thanks for adding the subject in.  I'm not used to this format, and
> forgot...
>
> Sadly, no clock.  It does have a battery, and luckily it hasn't leaked.
> I've already received a few emails with some tips, and will post an update
> soon.
>
> Thanks again,
>
> Jim
>
>
> On Mon, Dec 7, 2015 at 9:26 AM, J. L. Trantham <jltran at att.net> wrote:
>
>> Jim/Anna,
>>
>> I took the liberty of adding 'HP 5065A' to the subject line to help
>> others.
>>
>> Sounds like a nice 'find'.  There are many experts here regarding the
>> 5065A.  I'm a 'novice'.
>>
>> There are several manuals on the net.  You can find one manual here:
>>
>> http://www.ko4bb.com/manuals/207.98.180.176/HP_5065A_Manual.pdf
>>
>> Did the 'CONTINOUS OPERATION' light come on when you hit 'LOGIC RESET'
>> after switching to 'OPERATE'?  If so, sounds like it is working.  If not,
>> might want to check the light to make sure it's not burned out.  For that
>> matter, might want to check all the lights.
>>
>> What options does it have?  Clock?  Internal battery, as shown by a
>> 'Battery' lamp on the panel to the right of the door?
>>
>> If it has a battery, might want to remove it and make sure the NiCd's
>> haven't leaked.
>>
>> I suspect you have already measured the 5 MHz, 1 MHz, and 100 KHz outputs.
>>
>> These are nice units.  Good luck and welcome to the group.
>>
>> Happy Holidays!
>>
>> Joe
>>
>> -----Original Message-----
>> From: time-nuts [mailto:time-nuts-bounces at febo.com] On Behalf Of
>> Jim/Anna McIntyre
>> Sent: Sunday, December 06, 2015 10:31 PM
>> To: time-nuts at febo.com
>> Subject: [time-nuts] (no subject)
>>
>> Greetings all,
>> My name is Jim, I'm a Noob to your list.  A local DoD contractor unloaded
>> a heap of test equipment lately, and I scored a 5065A.  It's s/n
>> 1532A00666, has an Olive green-ish RVFR, and a 00105-6103, series 1284
>> Quartz oscillator.
>>
>> I have had the instrument powered up for about an hour now. (I first
>> checked the +/- 20V supplies and they're OK.)  I have a 1A source connected
>> to the TE lines.
>> At the end of the 1st hour here's what I'm seeing (Open Loop Mode).
>>
>>
>> Batt 48
>> Supply 38
>> Lamp Oven 30 (down from 50)
>> Cell Oven 30 (down from 50)
>> Osc Oven 44 (down from 50)
>> Photo 28
>> 5 MHz 32
>> Control, Error, 2nd Harmonic all read 0
>>
>>
>> I adjusted the Quartz Coarse control to be within 10-7.  Fine is set to
>> 250.  Synth output measures 5.315 005 728 MHz, and is about 1.8 Vpp.
>>
>> Control, Error, 2nd Harmonic all read 0 after I switch to Closed Loop and
>> hit 'Start'
>>
>> Please advise on next steps...
>>
>> Thanks
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>
>



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