HP 3435A Digital multimeter quick fix - diyAudio
Go Back   Home > Forums > Design & Build > Equipment & Tools

Equipment & Tools From test equipment to hand tools

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 17th February 2015, 06:12 PM   #1
diyAudio Member
 
Join Date: Dec 2008
Location: Victoria, BC
Default HP 3435A Digital multimeter quick fix

I recently bought a DOA HP3435A multimeter.

Those meters all seem to come with a battery backup 'Option' with a hefty NiCad battery pack and charger module in the lid. This meter was strictly for bench AC power use, and I have no interest in rebuilding the NiCad pack (which had been done once already, from what I could see).

There's a jumper location for non-battery use; using it brought back the meter from dead with blown fuses to working properly. I just left the charger/battery cable unplugged.

The service manual is available online, but I found the jumper from the clear printing on the PCB.
Good HP manuals link:
Index of /~kurt/manuals/manuals/HP Agilent

Re-flowing the solder on the switch connections seemed to clear up a small problem with volts/ohms LED 'confusion'.

It's nice working with good gear I could never afford when it was new.
  Reply With Quote
Old 17th February 2015, 09:48 PM   #2
diyAudio Member
 
PedroDaGr8's Avatar
 
Join Date: Dec 2009
Location: San Diego, CA
The battery pack option can often be used for ultra low noise measurements. If you don't need that, then just get it out of there so they don't leak everywhere.
  Reply With Quote
Old 17th February 2015, 10:55 PM   #3
diyAudio Member
 
Join Date: Dec 2008
Location: Victoria, BC
Quote:
Originally Posted by PedroDaGr8 View Post
If you don't need that, then just get it out of there so they don't leak everywhere.
I've done that, now. Thanks for the tip.
  Reply With Quote
Old 31st July 2015, 10:00 PM   #4
diyAudio Member
 
Join Date: Sep 2011
Default J401

Hi folks,
I found J401 on my non operational 3435a, but could not figure out how to wire it for no-battery operation. Would you be so kind to help ?
Thanks,
Renato
  Reply With Quote
Old 6th August 2015, 07:33 AM   #5
diyAudio Member
 
thaumaturge's Avatar
 
Join Date: Aug 2011
Location: Utah
Quote:
Originally Posted by rtoi View Post
Hi folks,
I found J401 on my non operational 3435a, but could not figure out how to wire it for no-battery operation. Would you be so kind to help ?
Thanks,
Renato
Service manual PDF
Doc
https://www.google.com/url?sa=t&sour...BgIRunCGtd4mZQ
__________________
Noli timere problematum affigit
  Reply With Quote
Old 6th August 2015, 03:55 PM   #6
diyAudio Member
 
Join Date: Dec 2008
Location: Victoria, BC
The jumper goes 'across' the connector for the battery option. As I recall, I had to look at the schematic as well as the parts layout diagram in the manual to make sure of the location.
Attached Images
File Type: jpg mini-HP multimeter jumper.JPG (199.3 KB, 28 views)
  Reply With Quote
Old 6th August 2015, 04:23 PM   #7
diyAudio Member
 
Join Date: Sep 2011
Thank you guys. I had posted the help request one week ago and went ahead to figure it myself. The meter is now functional, with J401 connected, and I was able to execute the adjustment procedure.
Now I am at the point of deciding wether to enable or disable the battery option. I purchased and installed a 6V 1.3AH sealed battery - unfortunately it was not able to get the meter to turn on (maybe i should fully charge the battery, but I am away from home till saturday).
This is the battery I got. It is smaller than the original, and terminals are a bit awkward to connect, but it is solid enough for me.
Click the image to open in full size.
I also got what seems to be a original Gates battery at ebay: Gates Cyclon EPG 0005 6V 2 5Ah SEALED Rechargable Battery 9143 | eBay
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
quick tripath fix? infobot Class D 7 17th August 2013 11:23 AM
Digital MultiMeter? nelsondog Everything Else 23 28th August 2010 10:42 PM
HP 34702 Multimeter problem. es44 Equipment & Tools 0 31st October 2008 06:45 PM
need help with getting a digital multimeter ad_breaker Parts 14 19th February 2006 02:13 AM
Digital Multimeter speedstar Digital Source 2 20th July 2004 02:56 PM


New To Site? Need Help?

All times are GMT. The time now is 12:48 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2015 DragonByte Technologies Ltd.
Copyright 1999-2015 diyAudio

Content Relevant URLs by vBSEO 3.3.2