Products > Test Equipment
Keysight 34465A in black
manupthehills:
Just got a new 34465A in my lab and, besides different plastic colors, it also has some internal differences to respect what I can see in the pictures available online.
Just curious if anyone has some insights about what changed in the "black" versions. :)
Well, had to replace the fan, that one is still the same whiny one anyone owning one of these DMMs is used to. Now is not dead silent, but at least it cut the noise in a half. :P
razvan784:
Woo, a modboard, nice! :D :P
I see they replaced the obsolete LM3 micro with the currently supported TM4C. :-+
Dr. Frank:
is it still running on WIN CE, or does it boot faster now?
The additional board looks like some protection structures.
Thanks for showing, maybe you can make pictures from the whole Mainboard w/o shield
Frank
nctnico:
Which Noctua fan did you use? I replaced the fan in my 34461A with a Noctua fan (5V IIRC) and it makes exactly the same whining sound :-BROKE
manupthehills:
Still Windows based, 25 seconds to boot up from standby.
The main PCB is marked 34460-26541 rev 001, maybe they unified the whole DMM family into using one PCB with different components, adding the small PCBA on the bottom for some versions.
Removing the shields would compromise the calibration, not planning to take more pictures for the moment.
The fan I used is a Noctua NF-A4x10 5V (4500 RPM, 3 pin connector). It's kept in place by the provided rubber mounts that leave a small gap between the metal deflector and the chassis (the fan and the deflector are in direct contact, but the fan has small rubber feet that provide some kind of mechanical isolation). Noctua has a 40x20mm model that should be slightly less noisy, but I didn't feel like experimenting with a potential different air flow inside the instrument.
I have a hard wall 4" behind the instrument reflecting the noise, so the difference with the original fan is not huge; the noise pitch is similar, just a bit quieter, I'd say a half
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