[time-nuts] HP 5061B - Beam Current

Scott McGrath scmcgrath at gmail.com
Sun Oct 5 16:45:59 UTC 2008

Did you try the LF injection test?

On Sun, Oct 5, 2008 at 8:48 AM, Jeffrey Okamitsu <w3kl at w3kl.com> wrote:
> I've spent a good deal of time this weekend working with the 5061B I recently acquired.
> The unit appears to be making stable 10 MHz.  I've compared it the the Rubidium source I have and the two compare as expected.
> There are two problems:
> 1) Beam current is low - even after going carefully through the alignment procedure outline in the service manual, the best I can get (Loop Open, Mod Off) is a bit over 10 nA.
> 2) The "Continuous Operation" LED will not come on after pressing Logic Reset.  I used the trouble shooting guide to diagnose the LED and it's pointing to the circuit on the A14 board.  This is as far as I have gotten so far. Note that the trouble shooting guide is suggesting that it might not be a problem with beam current, but an electronics problem (the LED driver).
> Anyone have any insight?
> Thanks for reading.
> Jeff
> Jeffrey K. Okamitsu, PhD, MBA
> +1-609-638-5402
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