Hello,
now I am an owner of a Datum 4040A cesium frequency standard. But, the unit did not work, after starting it, it locked, but 2 hours later it unlocked and reported error 2 and 3. (I am using the terminal software monitor3.exe on a Win 7 computer).
After unlocking the unit did lock again after some minutes, then it unlockes again and so on. After switching it off an let it cool down the cycle above can be repeated.
Are there any ideas how to start the diagnosis?
Best regards and many thanks
EMUD
I have discovered, that the values displayed in monitor3 did not match the values in the real unit, the attenuator i. e. seemed to be a current controlled PIN diode type, its voltage is 0,7 to 0,4V. Do you have any idea about that?
The other thing is to check the 12,8MHz from the frequency generation (STEL ... ) with a spectrum analyzer. I think that this cound make sense to see the points where the tube is measured. (the osc frequency control should be blocked for this)
Hello,
now I am an owner of a Datum 4040A cesium frequency standard. But, the unit did not work, after starting it, it locked, but 2 hours later it unlocked and reported error 2 and 3. (I am using the terminal software monitor3.exe on a Win 7 computer).
After unlocking the unit did lock again after some minutes, then it unlockes again and so on. After switching it off an let it cool down the cycle above can be repeated.
Are there any ideas how to start the diagnosis?
Best regards and many thanks
EMUD
Boy you're lucky your 4040A really has the serial output on it! That's wonderful news and that you're getting some lock. I have a feeling you're in better shape than I am right now and I'm glad you started a thread too. Any new info is good for me and my mine.
QuoteBoy you're lucky your 4040A really has the serial output on it! That's wonderful news and that you're getting some lock. I have a feeling you're in better shape than I am right now and I'm glad you started a thread too. Any new info is good for me and my mine.
4040A units do not have serial data out; 4040A/RS units do (the RS stands for RS232).
They used the same case for both types during the period mine was made.
QuoteThey used the same case for both types during the period mine was made.
I know.... I worked there for over thirteen-years. It's possible that unit was worked on by me because I worked on every unit that was returned for repair.
I wish I knew how to get more info from mine. It would be pretty wild if you did work on this one.
QuoteI wish I knew how to get more info from mine. It would be pretty wild if you did work on this one.
Does it have a round inspection sticker over one of the panel screws or a white rectangular tag on the front with the unit S/N and other info?
It should have initials then. If not my initials, it would be the initials of someone who worked on it, but I would have overseen the repair.