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Electronics => Repair => Topic started by: Dave_L on December 01, 2017, 01:35:06 pm

Title: Fluke 12 Multimeter Help
Post by: Dave_L on December 01, 2017, 01:35:06 pm

Hi All,

New to this site,so forgive me if I am doing this incorrectly. 
Ok, so I purchased a Fuke 12 multimeter from a car booty (knowing it didnt work) but the price was right and I thought what the heck.  However, I  am not the first person to open it up and it is missing a couple of parts (for a start).  I have attached a picture and circled the missing parts and I wondered if anyone could let me know the value of the resistor as well as the value of the pot and what the pot is set to (i know they will all be different, but it will give me an idea where to start.  Also does anyone know where i can buy a schematic or any repair guides to this meter if so could you email me the details please.  Any help will be greatly appreciated.

Dave

Title: Re: Fluke 12 Multimeter Help
Post by: noidea on December 01, 2017, 02:39:23 pm

Hi Dave_L
I've put a copy of the service manual on Drobox for you, schemaitcs and component list are at the back.
https://www.dropbox.com/s/o2lompuuoh1wqmv/FLUKE%2010%2C%2011%2C%2012%20Service.pdf?dl=0 (https://www.dropbox.com/s/o2lompuuoh1wqmv/FLUKE%2010%2C%2011%2C%2012%20Service.pdf?dl=0)

I'm not sure if mine is at work or not, if I can find it I'll open it up and try to take a few pics over the weekend

Title: Re: Fluke 12 Multimeter Help
Post by: Dave_L on December 01, 2017, 06:31:22 pm

Thnak you so much for this.

Title: Re: Fluke 12 Multimeter Help
Post by: nicalitz on December 02, 2017, 11:23:45 am

I haven't checked the service manual myself, but I measured the pot at 8.5kOhm.

If you end up having trouble with some of the buttons not working, which is common on the Fluke 12, you might also want to check the elastomeric strip that connects the keypad to the PCB. They do wear out over time, don't make decent contact anymore. I just added a bit of solder to the pads, easier than getting a new strip. Might also help to clean the button contacts.

Best of luck with the repair!  :-+

Title: Re: Fluke 12 Multimeter Help
Post by: Dave_L on December 02, 2017, 11:41:05 am

Hi,

Thanks for the information.  This site is brilliant as the response I have received by people has been so helpful..


Dave

Title: Re: Fluke 12 Multimeter Help
Post by: noidea on December 05, 2017, 07:38:26 am

Quote from: nicalitz on December 02, 2017, 11:23:45 am

I haven't checked the service manual myself, but I measured the pot at 8.5kOhm.

How were you measuring that, from where to where?

For what its worth the VR4 on mine is set to a similar physical position but I'm not going to mess with it as I don't have any sort of DC source to use as a reference to calibrate it again.