Products > Test Equipment
Any better way to use a HP 6625A than dragging cables from the rear outputs?
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Berni:

--- Quote from: bitseeker on October 12, 2016, 04:44:01 pm ---I didn't know that about the E3610A display update hack. Cool.

--- End quote ---

Here is the display update hack for the E3610A.

That C5 cap (Shown in red) has to be replaced with about 20pF to get roughly 10 Hz update rate. There are two Microchip TC7107 multimeter ICs driving it. But the clock pin on one is wired to the other so it is nececery to just change one RC circuit to speed up both.

Opening these up can be a bit tricky since its not instantly obvious since there are no screws holding it together. All held by plastic clips. There are 4 clips holding the front bezel on and 4 clips holding the rear(2 on top 2 on bottom) They need to be pried up as shown. Care must be taken to use as little force as possible as the plastic becomes brittle with age.
bitseeker:
Thanks, Berni. I have an E3610A in my repair queue. I'll check this out. I also have an E3630A that I'll have to take a look at for a similar hack.
German_Engineer:
Hi Berni,

thank you for the inspiration. I did the same modification on a 6626A including binding posts for the sense leads.

The front panel labels are "film free waterslide decals" from sunnyscopa (ppt and pdf attached). The look is nice and the durability ok. A low-noise "Noctua NF-A12x25 PWM" replaced the original fan. It is wired directly to header P210 on the GPIB board leaving the PWM input open. The fan has about half the througput of the original one but is sufficient for the 6626A. The heat sinks of the 50W outputs did not raise above 40°C at 22°C ambient temperature with all four outputs shorted and delivering the maximum current.

Regards and all the best
Hans
Berni:
Now that is one hell of a clean looking mod.

Those stickers look pretty much factory, as well as the very HP looking binding posts.
SMB784:

--- Quote from: German_Engineer on April 20, 2021, 12:06:42 am ---Hi Berni,

thank you for the inspiration. I did the same modification on a 6626A including binding posts for the sense leads.

The front panel labels are "film free waterslide decals" from sunnyscopa (ppt and pdf attached). The look is nice and the durability ok. A low-noise "Noctua NF-A12x25 PWM" replaced the original fan. It is wired directly to header P210 on the GPIB board leaving the PWM input open. The fan has about half the througput of the original one but is sufficient for the 6626A. The heat sinks of the 50W outputs did not raise above 40°C at 22°C ambient temperature with all four outputs shorted and delivering the maximum current.

Regards and all the best
Hans

--- End quote ---

Wow, where do you get those binding posts?  I need some for my E3631A, my old ones are all cracked and broken!
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