Author Topic: Agilent 34410A, Repair of 2 dead meters [success] (Read 53260 times)

plesa · « **Reply #100 on:** September 12, 2016, 06:23:21 pm »

Quote from: Dr. Frank on September 11, 2016, 07:41:14 pm

Hello HighVoltage,
and congrats to your crisp 34411A.
As the 465A/470A with Digitizing option are promoted to be successors to the 34411A,but do not perform well regarding data transfer in BenchView, would you mind checking, if the 34411A operates better?
That means, is it possible to transfer data in real time to benchview, with highest sampling rate 50kSa/s, w/o delay due to buffering?

THX

Frank

Hi Frank,

is it related to BenchVue?
I have one application where I needs to digitize 50k samples/s with 34411A. And it seems to be working well in LabView
( following setting was essential
:FORM:DATA REAL,64
:FORM:BORD NORM

reading is by R? command)

Do you have dump of SCPI sequence which is used by BenVue and 34470A?

HighVoltage · « **Reply #101 on:** September 12, 2016, 07:20:34 pm »

Quote from: Dr. Frank on September 11, 2016, 07:41:14 pm

Hello HighVoltage,
and congrats to your crisp 34411A.
As the 465A/470A with Digitizing option are promoted to be successors to the 34411A,but do not perform well regarding data transfer in BenchView, would you mind checking, if the 34411A operates better?
That means, is it possible to transfer data in real time to benchview, with highest sampling rate 50kSa/s, w/o delay due to buffering?

THX
Frank

Hello Frank
OK, I just hooked three instruments in parallel to my 10V Geller SVRT
All three instruments are hooked up to BenchVue via Network Cable on a 1 gbit network
This is what I get for collecting 1 Mega Samples at fastest acquisition time:

34410A
10.024 KSa/sec
Time for collecting data: 99 Sec

34411A
50.118 KSa/sec
Time for collecting data: 19 Sec

34470A
25 KSa/sec
Time for collecting data: 40 Sec

I can send you the exported Excel files, if you like.
It is interesting how the screen of the three instruments are changing to just show the word: "DIGITIZING"

Is this what you wanted to know?
Or do I need to do some more test's

Dr. Frank · « **Reply #102 on:** September 26, 2016, 01:03:03 pm »

Quote from: HighVoltage on September 12, 2016, 07:20:34 pm

Hello Frank
OK, I just hooked three instruments in parallel to my 10V Geller SVRT
All three instruments are hooked up to BenchVue via Network Cable on a 1 gbit network
This is what I get for collecting 1 Mega Samples at fastest acquisition time:

34410A
10.024 KSa/sec
Time for collecting data: 99 Sec

344110A
50.118 KSa/sec
Time for collecting data: 19 Sec

34470A
25 KSa/sec
Time for collecting data: 40 Sec

I can send you the exported Excel files, if you like.
It is interesting how the screen of the three instruments are changing to just show the word: "DIGITIZING"

Is this what you wanted to know?
Or do I need to do some more test's

Hello HighVoltage,

sorry that I discovered your post and answer so late!

No, that's not yet the crucial test, because with these settings, both instruments (411A and 470A) will handle all the digitizing fully inside internal memory. If you increase the number of samples to more than 1MSa for the 411A, and more than 2MSa for your 470A @ 50Khz also (has to be manually set to digitizing at the instruments panel!), then you might notice a delay and even data loss, as at least the 470A is not able to transfer data fast enough over the bus, at first due to the ASCII format.

The 411A may have a dedicated state machine, or faster SW code, to handle that fast transfer to PC, as specified in its manual (*)(lacking for the 470A!), and might also transfer in 4 byte / 8 byte format, which would be 4 or 2 times faster, than with the ASCII transfer.

Would be nice, if you could test again with 50kSa/ sec and 4MSa for both.

THX!
Frank

PS: I assume, that both instruments don't have the possibility to transfer data directly to PC, omitting the buffer.
This method is available on the 3458A (@ >100kSa/sec), and allows real-time digitizing.

(*) "Direct I/O Measurements", and "Maximum reading rate out of memory"

HighVoltage · « **Reply #103 on:** September 26, 2016, 01:48:16 pm »

OK, I will do some more acquisition tests this week.

plesa · « **Reply #104 on:** September 26, 2016, 06:28:12 pm »

I'm using 10k-50k sample count and on NPLC 0.001 and with binary data format (:DATA REAL,64;) and there is no gap in data and digitizing looks like realtime @ 50k/sec.
If I remember testing few years ago there is no big difference between maximal rates on USB or GPIB.

USMCBYRD · « **Reply #105 on:** December 01, 2016, 08:54:41 pm »

Gents (ladies),

I am attempting, and I use that term very loosely, to repair a 34410a that has a faulty USB connection. Upon disassembling the instrument it was immediately apparent someone had shorted something with higher voltage to the connection. The components located at T1001 and FB1005 were blown completely off the CB. I have been searching the internet for days trying to find out what these components are. I believe they are a Transformer and Ferrite Bead. I would like to order replacements to see if I can get the USB connection back up and running. Can anyone help me determine the parts I need to order? I greatly appreciate any help you can give. Thank you.

HighVoltage · « **Reply #106 on:** December 01, 2016, 09:15:45 pm »

Can you show pictures of the broken parts?

plesa · « **Reply #107 on:** December 01, 2016, 09:17:43 pm »

Here is part of schematic of 34410A related to USB. Is meter able to pass self test?
Exact values should be in manual for Cypress chip.

HighVoltage · « **Reply #108 on:** January 05, 2020, 03:33:19 pm »

A forum member asked me to show a high resolution picture of U305 in the Keysight 34410A.
Here it is.

faraday · « **Reply #109 on:** January 15, 2021, 08:05:18 am »

Quote from: HighVoltage on February 12, 2016, 06:12:25 pm

OK, a quick follow up .... Repair is successfully completed.

Parts from Keysight arrived.
There was no way around this expensive Keysight relay, as Meder would not sell me anything.
- Installed the relay
- Installed new front connector block, because the contacts did not look so nice
- Installed new low noise fan.
- Reassembled the meter.

Hooked up to my Geller Labs SVRT, showing: 10.00001V after warmup.
Looks like another great addition to the lab.
Thanks for all your input.

Do you have part nr for installed FAN? I want to mod my noisy meter and looking for low noise replacement.

HighVoltage · « **Reply #110 on:** January 15, 2021, 09:09:33 am »

This was a long time ago, but I think I have used a Sunon MF40100V2-1000U-A99
In addition I have placed a 100 Ohm resistor in series to slow it down.

https://www.mouser.de/ProductDetail/Sunon/MF40100V2-1000U-A99?qs=EU6FO9ffTwcmA4g%2FuEYqgQ==

Le_Bassiste · « **Reply #111 on:** January 15, 2021, 09:42:39 am »

Quote from: HighVoltage on September 11, 2016, 01:00:33 pm

But I better stop talking, otherwise I will no longer find these scores.

yeah, thanks for being the party pooper!

HighVoltage · « **Reply #112 on:** January 15, 2021, 01:15:58 pm »

No worries, I have plenty of benchtop DMMs by now. Maybe too many

bitseeker · « **Reply #113 on:** January 16, 2021, 08:22:41 pm »

Maybe...

coromonadalix · « **Reply #114 on:** January 17, 2021, 01:42:56 am »

surely loll

HighVoltage · « **Reply #115 on:** September 11, 2021, 11:08:58 am »

Newest addition, a broken 34411A.

Problem was that unit turned ON but buttons did not react to any push.
Somehow this unit was in a strange environment and all the carbon pads had corrosion on the PCB.
I never had this problem before. I cleaned it all with alcohol and it works like new.

This instrument is newer than the previously shown and is from 2013.
Here are some pictures for your enjoyment.

Also interesting, the metal shielding around the front VFD area.
The 34411A is a very well made meter.

bitseeker · « **Reply #116 on:** September 18, 2021, 08:57:47 pm »

Good thing it didn't eat away the contacts. Nice find and recovery!

HighVoltage · « **Reply #117 on:** April 30, 2022, 12:48:15 pm »

Well, another broken 34410A found its way to me.

This one passes the self test and works well in all DC ranges but all AC measurements are wrong.
Looking forward to the repair, but need a time slot first.

bitseeker · « **Reply #118 on:** June 06, 2022, 12:56:34 am »

Looking forward to it, HV.

HighVoltage · « **Reply #119 on:** June 06, 2022, 09:15:35 am »

The repair was much easier than I had expected.

The 1 MOHM input resistor is divided into tiny 5x 200 kOHM resistors for high voltage reasons, I assume.

Two resistors (R465 and R466), and one parallel capacitor (C465) were dead.
The large input capacitor C400 was perfectly OK.
I exchanged all the small resistors and capacitors and now the unit performs well.

412jim · « **Reply #120 on:** February 20, 2023, 02:58:55 pm »

Anybody know where I can find a front/rear push rod (PN 34410-43712) for a 34410A? I just need the plastic front panel push button part, the switch works fine. I searched pretty deep on google but couldn't find anything.

coromonadalix · « **Reply #121 on:** February 20, 2023, 03:45:59 pm »

tried to get them at keysight usa ....nada maybe elsewhere or 3d print one ??

even the short one .... nada

not sure if the ones for the 34401a are the same lenght

HighVoltage · « **Reply #122 on:** February 21, 2023, 07:22:23 am »

I am traveling right now, but when I am back in my lab, I can look.
I think I ordered a few, many years ago, when they were still available.

The 34401A has a completely different rod from the 34410A

412jim · « **Reply #123 on:** February 21, 2023, 03:10:46 pm »

A 3D print is the backup plan, but an OEM part is preferred.

Thanks for checking HV. Let me know...

Bruce Savage · « **Reply #124 on:** August 30, 2023, 12:18:34 am »

Hello I'm new here. I just bought a 34410a on ebay. The fan was mounted with the label facing the rear of the unit and was turning clockwise when viewed from the rear. So it was sucking air out of the unit. What confuses me is that the decal on the back with the number '40' inside seems to indicate that it should be turning counter clockwise. So is the fan supposed to be sucking air out or pushing air in?


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Author Topic: Agilent 34410A, Repair of 2 dead meters [success] (Read 53260 times)

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