Author Topic: Keysight 34465A in black  (Read 1277 times)

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Offline manupthehills

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Keysight 34465A in black
« on: December 29, 2020, 08:01:39 pm »
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
« Last Edit: December 29, 2020, 08:13:14 pm by manupthehills »
 
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Offline razvan784

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Re: Keysight 34465A in black
« Reply #1 on: December 31, 2020, 03:10:10 pm »
Woo, a modboard, nice! :D :P

I see they replaced the obsolete LM3 micro with the currently supported TM4C. :-+
 

Offline Dr. Frank

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Re: Keysight 34465A in black
« Reply #2 on: December 31, 2020, 08:12:06 pm »
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
 

Online nctnico

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Re: Keysight 34465A in black
« Reply #3 on: December 31, 2020, 08:47:22 pm »
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
There are small lies, big lies and then there is what is on the screen of your oscilloscope.
 

Offline manupthehills

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Re: Keysight 34465A in black
« Reply #4 on: January 02, 2021, 01:37:20 am »
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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Offline PushUp

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Re: Keysight 34465A in black
« Reply #5 on: January 02, 2021, 06:40:53 pm »
As Keysight doesn't offer pix in black on their HP yet,...



https://www.keysight.com/en/pdx-2891457-pn-34465A/digital-multimeter-6-digit-truevolt-dmm?cc=GB&lc=eng

...it would be nice to see some from the outer design as well, before you put it into your rack.


ThanX!  :)
Due to the massive "EEVblog forum attachement bug", I am now using an external picture hoster, till it is solved...
 

Offline JDubU

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Re: Keysight 34465A in black
« Reply #6 on: January 02, 2021, 07:01:24 pm »
 

Offline HighVoltage

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Re: Keysight 34465A in black
« Reply #7 on: January 03, 2021, 11:00:51 am »
Thank you for sharing the pictures from the inside.
Here are some pictures from the outside.

It would be nice to have a full PCB picture in the future.

Can you make a screenshot from the info (about) screen?



« Last Edit: January 03, 2021, 02:46:40 pm by HighVoltage »
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Offline Messtechniker

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Re: Keysight 34465A in black
« Reply #8 on: January 03, 2021, 02:06:49 pm »
Did this Noctua thing on my 34465A a while ago. Was a NF-A4x10 5V. Some insights here:
https://www.eevblog.com/forum/testgear/keysight-34461a-fan-noise/msg2843508/#msg2843508

Agilent 34465A, Siglent SDG 2042X, Hameg HMO1022, R&S HMC 8043, Voltcraft VC 940 M-Audio Audiophile 192, R&S Psophometer UPGR, 3 Transistor Testers
 

Offline manupthehills

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Re: Keysight 34465A in black
« Reply #9 on: January 03, 2021, 05:47:48 pm »
Here the picture of the "about" screen

- Thanks Messtechniker, I read about your experiments even before getting the instrument  :)
 
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Offline Dr. Frank

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Re: Keysight 34465A in black
« Reply #10 on: January 04, 2021, 04:06:44 pm »
Hello,

this additional PCB on the bottom side contains a protection structure, I think for the DCV path, which was before assembled on the top side of the 34465A main board.
The previous 34460 main board seemed to be in most parts identical to the latter one, only that some components were not assembled (see review activities when Dave initially made a teardown of the 34470A in 2015).

In this security bulletin: https://www.keysight.com/upload/cmc_upload/All/Truevolt_DMM_Product_Declassification_Security.pdf
it's mentioned on the last page, that  Microsoft Windows® CE 6.0 R3  is used inside these instruments.
Support by MS was already finished in about 2018, and EOL is announced probably for next year, like CE 5.0, but I found no official statement yet.
That means, that any time soon, KS will not be allowed to sell new devices with these old O.S.

I doubt, that KS in between was able to move to direct successor O.S. like Windows Embedded 8 or 8.1, if that would physically possible, actually.

Rumors that KS is already in preparation for a new O.S. were already expressed, I think on our MM 2019.

Hopefully they get this done in time, as I assume that the whole line of TrueVolt instruments, like also Generators, sources and PSUs may be based on that SW platform.

Frank
 


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