Electronics > Repair
Agilent 53132A Counter Repair (FIXED and Upgraded)
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HighVoltage:

--- Quote from: Vgkid on January 23, 2016, 12:45:23 am ---Is that fan strong enough, 5.5 cfm is not much.

--- End quote ---
It seems very strong and blows very good and steady out of the back.
I also have a 53131A with double oven reference and still an original fan in there and it blows about the same.
So, I see no worries there.
It has been running for about 48 hours now and seems to be very stable.
Nuno_pt:
Well, there is one mod i can do on my 53181A with Polish channel 2 option, will change the fan since it's very annoying.

I've found this two, I suppose the original it's 12Vdc fan, I don't have the schematic or manual on hand:

Ebmpapst 412/2H-048
12Vdc
100mA
7000rpm
12,5m3/h
25dB

and

Ebmpapst 412
12Vdc
0,9W
75mA
6000rpm
10m3/h
18dB

but this are more expensive about 9 to 14€
HighVoltage:
Thanks for those fan part numbers.
The fan I installed works very well.

I had the counter officially calibrated and it passed all tests perfectly.
Here it is hooked up to my HP GPSDO and comparison to my 53230A
Seems right perfect.
Nuno_pt:
HighVoltage,

Can you tell how the fan is attach to the board, solder wires or connector?
Can you confirm that the fan is 12Vdc?
I'm not at home till almost the end of the week, so no chance to look on the inside.
soul40k:
Hey guys, wondering if you have any possible solutions to a Front End/Measurement self test fail on this?

I have all of my information on my laptop which I left at work unfortunately, but from what I remember, I have near perfect V's from the PSU, it had many issues on the logic side though, very hot MPU chip, which when replaced, fixed every self test issue I had except for Front End/Measurement test.

I bypassed the test screen and attached the reference out to both channels, and it will measure perfect 10MHZ, but if I take off the connections, it seems to float at any random amount with nothing being input. If I am not mistaken, I had a low VCC/GND ohmage (below 20ohms), and if I were to touch the board while running, it would stabilize the read out, but still not bring it to zero with nothing being input.

Sorry for this being my first post, just got into eev, literally starting from the beginning vids/pods, hope to be here more often!
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