| Products > Test Equipment |
| HP5385A OCXO Timebase |
| << < (3/7) > >> |
| 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. |
| Navigation |
| Message Index |
| Next page |
| Previous page |