[time-nuts] HP 5372A channel c option 030

Magnus Danielson magnus at rubidium.dyndns.org
Fri Jan 6 21:12:56 EST 2017

Hi Bob,

There is also the A20 board for the C-channel consisting on a series of 
attenuator, amplifiers/limiters and a divide by 4 before reaching that 
SMA connector. You then flip the option switching on the motherboard.

I got the C-channel on mine, but you should be looking into 
05372-90016.pdf which is the service manual, chapter 12.

If you have a replacement board that does the same operation, you can 
enable the C-channel without too much effort as you install it.


On 01/07/2017 02:26 AM, Bob Bownes wrote:
> While I had the 5372a apart today to replace the battery, I noticed that there is an SMA for channel C on the events board and diagram showing a cable from there to the front panel.
> This suggests to me that the upgrade is a cable and a key, jumper, or memory setting.
> Anyone ever done the upgrade?
> Bob
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