Electronics > Metrology

Inspecting, aligning, and testing an HP 5065A Rubidium

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5065AGuru:
Stephano,

That (the R29 pot you mentioned) is a very good sign.

If the instrument has a strong signal the pot does indeed end up being almost max CCW and hard to set.

Cheers,

Corby

testpoint1:
today I also have time to fix my current 5065A, just follow Corby's procedure, may need several weeks since I need to replace many components and its battery, I have some idea for this:
1. +20V or -20V output, according its manual, it is +-0.2V tolerance;
2. for the Tantalum capacitor replacement, if the pin/terminal is OK, the testing result seems good, I try to replace them all, but when I purchased some "new" capacitor from Ebay, the testing KPI is worse than old one, but you can use the cemeric capacitor instead of them (100uF 30V using the 220uF 63V instead of it); the attached photo is for capacitor testing;
3. for the Rubidium lamp, it is quite good, I can say, till now,  its technology better than current small Rubidium standard, just like LPRO, SRO-100 or PRS10 etc.

bnz:
I recently got a 5065A and replaced the suspect caps and the 1k3 resistor. As it immediately locked and had good meter readings I did not do any alignments up to now. I just kept it running like that for that rubidium balance gets established again.
I am however uncertain about the development of the second harmonic reading of the meter, it kept increasing and is now at 50 (according to the manual the expected range is 20-40). Is that good or a problem? I.e. should I stop warming up and start trouble shooting  :-//

KE5FX:

--- Quote from: bnz on November 12, 2023, 05:53:23 pm ---I recently got a 5065A and replaced the suspect caps and the 1k3 resistor. As it immediately locked and had good meter readings I did not do any alignments up to now. I just kept it running like that for that rubidium balance gets established again.
I am however uncertain about the development of the second harmonic reading of the meter, it kept increasing and is now at 50 (according to the manual the expected range is 20-40). Is that good or a problem? I.e. should I stop warming up and start trouble shooting  :-//

--- End quote ---

It's normal for the 2H reading to go up over the first several days of operation.  Given the dramatic increase you're seeing, it may have already had some cell flooding the last time someone aligned it. 

The best approach, now that the caps have been replaced, is to let it sit there for a week or two before you make any adjustments. Any tweaking you perform prior to burn-in will likely need to be repeated once things stabilize.

pquadrat:
There seems to be a russian/ukrainian/soviet era clone of the HP 5065A:

https://www.ebay.com/itm/235042380910?itmmeta=01J2RHPDED6FRZYP97PKYS4MM4&hash=item36b99e1c6e:g:60IAAOSw5Y1dd0FU&itmprp=enc%3AAQAJAAAA8CKDKQNDVCtCDVBDql01YbjfMIvU1%2Btq5xs%2FaRdNi6qNFAWoZ%2BcOuOXXU7AiSaHIstm7okhMSpMZ1R49LA87UphmzeBprV80FrDFGW7MKOwfktdmPkkIpKTEcuStBVgosfp3yYp411ut1VVhmT7K89rqrqFevkq3y6fDWQ0hAeAAV3zi%2FIcb%2BphI1iKxLmpfUw5pOlckuhyP5KifmsSVOBeJsqYjhMQRi6IjU%2B4kogoNWCPlrpagy27jsk3su8VoVLEIP%2FTGt0vF%2B8cJUiBpuF2h366EE%2Fw7TPAXygtFBEpCL%2Ftv8e1fQp1vtZ%2Fh4unGzg%3D%3D%7Ctkp%3ABk9SR6LX2ZGWZA

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