Products > Test Equipment
HP5385A OCXO Timebase
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texaspyro:
The TICC can handle over 100 Hz.  With some firmware mods the hardware can probably do 1 kHz... hence the use of input dividers.  The serial port data rate is one limitation.

If you want to do independent two-channel measurements on the TICC you need to have a good input clock source.   If you are doing differential measurements the TICC input clock does not need to be as good because it is basically being used as a short-term time-transfer reference.

Both Heather and Timelab support the TICC.
Miti:

--- Quote from: texaspyro on December 17, 2018, 02:57:46 am ---An OCXO that has been powered off for a long time can take over a month for the drift to level off and stabilize.  Here is what the 8663 DOCXO did when I put it in an HP58132A counter.

--- End quote ---

Yes, I was surprised to see both OCXOs, the one in the GPSDO and the one in the frequency counter, drifting slowly up, the GPSDO adjusting the DAC lower and lower, and I having to adjust the potentiometer every few days. They seem to have slowed down but still drifting up super slow.

I thought that them drifting was the reason why they were removed from the original equipment but now I understand it is normal and I can expect them to level off by now.
On top of that, I had to fix the OCXO in the GPSDO, the heater transistor was disconnected from the crystal so I know at least why that one was removed.
metrologist:

--- Quote from: Miti on December 16, 2018, 11:54:25 pm ---After more than one month of running continuously, with the OCXO timebase and the 10MHz GPSDO at the input, my frequency counter drifts about +/- 400ppt maximum, probably due to ambient temperature changes. Impressive, eh?

--- End quote ---

That is just within spec. It will probably get better as it runs. My Wenzel timekeeper has increased 0.593mHz since September. Not as impressive as texaspyro's...
mikepi:
Hi, I'm a new member are the boards still available?
Miti:
I've sent you a PM.
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