[time-nuts] HP5065A Rubidium 2nd Harmonic Readings

Brian Kirby kilodelta4foxmike at gmail.com
Fri Oct 29 22:38:21 UTC 2010


The 2nd Harmonic is the only one showing variation

Battery		0
Supply		38
Lamp Oven	25
Cell Oven	23
Osc Oven	36
Photo I		31
5 Mhz		18 (loaded)
Control		0.5
Error		0
2nd Harm	31
1 Mhz		38 (no load)
100 khz		38 (no load)

Brian - KD4FM





On 10/29/2010 5:20 PM, John Miles wrote:
> There are a couple of 20 uF axial tantalum electrolytics across the B-C
> junctions of the pass transistors for both the lamp and cell heaters.  They
> were open in my 5065A when I got it, and there was some overheating damage
> on the lamp driver PCB.  Correlation != causation, but since I'm not sure
> what those capacitors were actually supposed to do in the first place, I
> think they're worth checking.
>
> -- john, KE5FX
>
>> -----Original Message-----
>> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com]On
>> Behalf Of paul swed
>> Sent: Friday, October 29, 2010 6:02 AM
>> To: Discussion of precise time and frequency measurement
>> Subject: Re: [time-nuts] HP5065A Rubidium 2nd Harmonic Readings
>>
>>
>> John,
>> Interested. How might you connect the oven controller to what he
>> is seeing?
>> Bad caps causing it to oscillate, 60 hz modulation, ......
>> I have a 5065 so am always interested in tid bits that I read.
>> Thanks
>>
>> On Fri, Oct 29, 2010 at 12:34 AM, John Miles<jmiles at pop.net>  wrote:
>>
>>> How's the photo current?  Does it vary as well?  If not, I
>> don't think I'd
>>> be too worried about the physics package.
>>>
>>> I would, however, check the electrolytics on the oven controller board.
>>>   You
>>> don't want an oven controller failure.
>>>
>>> -- john, KE5FX
>>>
>>>> -----Original Message-----
>>>> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com]On
>>>> Behalf Of Brian Kirby
>>>> Sent: Thursday, October 28, 2010 9:15 PM
>>>> To: precise time
>>>> Subject: [time-nuts] HP5065A Rubidium 2nd Harmonic Readings
>>>>
>>>>
>>>> I recently had a long term power failure and ran out of UPS time.  The
>>>> power was out over a day and when I returned home, it had
>> been restored.
>>>>
>>>> The rubidium recovered, I hit the logic reset button and start and got
>>>> the green light.
>>>>
>>>> I made some meter readings, and noticed something I have not seen
>>>> before.  The 2nd Harmonic reading is showing 30 and its bouncing up to
>>>> 31 about every 2 to 3 seconds.
>>>>
>>>> Otherwise, the unit seems to be performing nominal.
>>>>
>>>> Anybody ever seen this ?  Hope its not trying to tell me
>> failure of the
>>>> cell is on the way...
>>>>
>>>>
>>>> Brian - KD4FM
>>>>
>>>
>>>
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