Products > Test Equipment
HP 8664A faults
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lugaw:
For anyone who is having this error code the fix is to use an external 10Mhz source or repair the OCXO which have a habit of turning off the OCXO because some components on the module degrades because of time.

If the HP OCXO is still outputing 10Mhz you can just jumper it directly to J2.  The A20 module have extra circuitry that detects if there's another timebase present and suppress the OCXO.  This circuit is not used by the 8664A.  This is what I did to my 8664A and it's still working.
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