[time-nuts] HP 5316B External Reference

[Magnus Danielson]

Hi,

Quick correction, I wrote "HP 5314A and 5314B" and meant "HP 5316A and
5316B" which is the relevant here.

Sorry for that blunder.

Cheers,
Magnus

On 2020-07-12 22:08, Magnus Danielson wrote:
> Hi Wes,
>
> On 2020-07-12 00:51, Wes wrote:
>> As I understand it this counter has an external reference input that
>> isn't used directly as the time base but injection locks the internal
>> time base.  Does anyone here know how well this works. Is using a
>> GPSDO as a reference a worthwhile accuracy improvement?
> It was fairly easy to locate the operations and service manual for the
> HP 5314A and 5314B and they both have the same input setup, which is a
> "injection lock multiplier" which is switched in on case of external
> reference.
>
> So, rather than injection lock the crystal oscillator, another
> oscillator is switched in which is more a LC-resonator that triggers on
> the edge of input. It's crude but good enough for the counter.
>
> Feeding it a proper frequency will help, but you want to first do
> trimming to adjust the free-running frequency, which can be done using a
> procedure described in the manual that forces is into self-oscillation
> so that it can be trimmed. Then, injection locking will pull it
> sufficiently close.
>
> It's crude but it works. This is not the counter they invested most in,
> but it can still do quite a bit. It's a budget counter with ext ref and
> HPIB. I have a 5314A which has neither of these, but may be suitable for
> portable use or even battery use.
>
> Cheers,
> Magnus
>
>
>
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