Products > Test Equipment

53132A TB CAL FAIL

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motocoder:

--- Quote from: dadler on August 26, 2015, 11:32:46 pm ---Thanks.

Do you guys know if there are lots of different versions of these MV89A oscillators?

Mine came with one labeled MV89A XO00281M-CT-MV89

I see some on eBay with this labeling, but usually no production year.

There are some newer ones that are labeled e.g. "XO00281M Rev.3 30062000011", but I don't know if these are the same class or not.

None of the numbering seems to match the datasheets I have found: http://www.morion.com.ru/catalog_pdf/MV89-OCXO.pdf

--- End quote ---

I don't know, although I haven't heard of there being versions of the MV89 with significant differences for the MV89. The only thing regarding class that's mentioned on the data sheet is the "A" suffix, which just specifies a temperature grade, not any difference in other specs. I think they go for about $25 - $30 on eBay, so that might be a cheap fix if you can determine conclusively that it's the OCXO that is the issue.

BTW, I confirmed the board in the pics you posted is definitely different than the one I bought. Yours does not even have the jumper that I mentioned, so jumper having fallen off is not the issue.

dadler:
I see-thanks for the info.

The seller responded and says he offers a 12 month warranty. I am sending the timebase back to Poland for repair. I guess I'll be back on the old Agilent tweak-a-pot crystal for a while. The factory oscillator in these units is terrible.

motocoder:

--- Quote from: dadler on August 27, 2015, 07:00:55 am ---I see-thanks for the info.

The seller responded and says he offers a 12 month warranty. I am sending the timebase back to Poland for repair. I guess I'll be back on the old Agilent tweak-a-pot crystal for a while. The factory oscillator in these units is terrible.

--- End quote ---

Yeah, it's pretty bad. Glad to hear the seller stands behind his product. You could also grab a GPSDO and set it up as an external reference. There's a couple of recent threads on this topic:

https://www.eevblog.com/forum/testgear/bg7tbl-gpsdo-master-reference/
https://www.eevblog.com/forum/testgear/economical-option-for-precision-frequency-reference/

dadler:
Just an update: I returned the timebase to Poland, and the seller sent me a replacement (which calibrated correctly).

Turns out the OCXO itself was working--It seems the DAC failed. Generating negative voltage regardless of input.

I don't know what would cause a DAC to fail spontaneously.

Orange:

--- Quote from: dadler on October 28, 2015, 07:30:54 am ---Just an update: I returned the timebase to Poland, and the seller sent me a replacement (which calibrated correctly).

Turns out the OCXO itself was working--It seems the DAC failed. Generating negative voltage regardless of input.

I don't know what would cause a DAC to fail spontaneously.

--- End quote ---
Most likely ESD (Electrostatic Discharge) during manufacture. These failures can sometimes manifest themselves after a while....

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