[time-nuts] HP E1938A Oscillator

Azelio Boriani azelio.boriani at screen.it
Fri Jul 5 09:09:11 UTC 2013


Maybe the supporting board of the E1938A stores calibration constants...

On Fri, Jul 5, 2013 at 11:00 AM, Bruce Griffiths
<bruce.griffiths at xtra.co.nz> wrote:
> Magnus Danielson wrote:
>>
>> Hi Perry,
>>
>> On 07/05/2013 07:23 AM, Perry Sandeen wrote:
>>>
>>>
>>>
>>> List,
>>>
>>> I was looking on Ebay for some HP E1938A
>>> oscillators
>>>
>>> What I found listed were:
>>>
>>> HP E1938A 10 MHz Quartz Oscillator with EFC on PC
>>> board. $100 Fluke.l
>>>
>>> HP E1938-60201 Ovenized Crystal Oscillator  (on a PC board) $100 Tomy
>>> Chou
>>>
>>> HP E1938A Ovenized Crystal Oscillator  W/O a PC board for $50 and free
>>> shipping from  2010bluebook.
>>> My question is thus:  What does the PC board do?  All I need is a HP EFC
>>> oscillator that would
>>> be better that my HP 10811-60111’s.
>>>
>>> Do I need to worry that the E1938A’s without the
>>> board maybe of lessor quality than the others?
>>>
>>> Fluke.l says his units are good but not stellar.  The other venders say
>>> they have tested the
>>> units and guarantee them to be good.  If
>>> so, would it get better with aging?
>>>
>>> So what does the collective wisdom/experience of
>>> the group think?  TIA
>>
>>
>> Don't get the puck only. Pulling it from the board with all it's support
>> functions, including oven controller etc. was a bad move. Do look at the
>> material online to see what I mean.
>>
>> Cheers,
>> Magnus
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>
> However the pucks can be a useful replacement when an E1938A oscillator
> fails as one of mine did.
>
> Bruce
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