Corby,
well, the OP Amp was shot.
When I pulled it out, I saw a marking 'BAD 7-8-97' on the side cover.
I was hoping to get it fixed because the 1uF ceramic cap at +15V was
shorted and had burned the 75R resistor.
But, after some serious investigation, I'm realizing that it is
incompatible
Corby,
the frequency test performed yesterday as follows:
- Peak Frequency 38.78 kHz at 1V eff
- EM Output connected directly to a 34401A
- measured -102 mV (10.2 nA)
- Peak Frequency 38.78 kHz at 2V eff
- EM Output connected directly to a 34401A
- measured -133 mV (13.3 nA)
- Audio Signal
Adrian,
You say it does not lock.
When you put in operate and push the logic reset button does the green
light come on?
What is the 2nd harmonic meter reading?
If too low the logic will not turn on the green light. Raise the reading
via the A7 gain adjust thru the front panel hole.
Is the
Corby,
yes, the green light comes on, but when I turn the osc. fine control by
more than +/- 30, it goes off.
The output frequency changes with the fine adjust, so that narrow range
appears more like a pseudo lock indication. I can even unplug A8P6 and
the green light is still on.
Output from
I got a 5061A with high performance tube that I'm trying to get running.
The Cs oven works and the -3500 and -2500V are there.
The beam current has its maximum at the correct frequency.
90MHz from the multiplier are there and they are phase modulated with
137Hz at about 0.01 rad.
Measured on a
Adrian
It looks like you are gathering a lot of good detail. I have a couple of
thoughts. But will say there are many on this list that are far far more
knowledgeable then me. My experience was in building a hp 5060/61 combo. A
mixed marriage that worked.
That said. You don't mention the current
Adrian,
Most used High stability tubes are DOA but you might get lucky!
You say the low frequency test worked.
What was the amplitude of the peak in nanoamps and was the peak well
above the noise or baseline level?
Once you were on the peak did you adjust the 41.6Khz amplitude to max the
: [time-nuts] HP 5061A Problem
I got a 5061A with high performance tube that I'm trying to get running.
The Cs oven works and the -3500 and -2500V are there.
The beam current has its maximum at the correct frequency.
90MHz from the multiplier are there and they are phase modulated with
137Hz
Corby,
many thanks for the comprehensive instructions.
After the harmonic generator alignment I measured 90mV into the 10Meg
DMM input, so the beam current should be 9nA.
The floor with the harmonic generator pot fully ccw was 6nA.
I didn't change the generator output during the LF test. To
Adrian,
You can use either Zeeman frequency as long as you use the corresponding
A1 frequency synthesizer setting.
See: http://www.febo.com/pipermail/time-nuts/2005-April/018171.html
This does not matter for troubleshooting but once you want to get on
frequency they need to match.
Corby
Hi all,
My 5061A has failed and I've isolated the problem to a faulty A18, the +3500
volt ion pump power supply.
The existing one has almost certainly has had the internal 200M resistor go
open as the output voltage is about 5 kV and it does not decay quickly when
the power is off. The
If you install the second unit, your 5061A still won't work. +20v at the
sensor output will signal the ion current monitor to shut down the
electron multiplier supply.
If you have some high-value resistors around, can you make up a test
200M resistor string? If so, see what happens when that's
and thus the S/N output gets poor?
-Brian, WA1ZMS
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
Behalf Of wje
Sent: Monday, August 18, 2008 1:43 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] HP 5061A problem
If you
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