Products > Test Equipment
Repair of a Vintage Simpson 461-2 DMM
<< < (8/8)
Excavatoree:

--- Quote from: xrunner on March 03, 2015, 04:29:36 pm ---Update:

Just arrived from Chile, courtesy of Lightages. Set of NEW Probe Master test leads for the older Simpson meters (reverse banana plugs). Wow. Many thanks to Lightages!  :D

--- End quote ---

Don't the newer Simpson 260 meters (series 7 and series 8) use these?  I've heard them described as "Reverse banana."  Or is my memory hopeless?   
xrunner:

--- Quote from: Excavatoree on March 03, 2015, 05:13:54 pm ---Don't the newer Simpson 260 meters (series 7 and series 8) use these?  I've heard them described as "Reverse banana."  Or is my memory hopeless?   

--- End quote ---

I don't think so. I think the newer Simpson meters are "normal" banana plugs, from what I see Googling pics. Some bright guy back in the day had the idea that the "pointy" end of the connection should be on the meter, so that if the leads were connected to a high voltage, and also not in the meter, the end of the lead would be safer. Of course it's all changed in the modern era.

Excavatoree:
Ah, it's the latter case, as I expected.  I still consider this one:

http://simpson260.com/260-8/simpson_260-8prt.htm

to be a "new" one. I'm sure the 8X and 9x types are newer, and they have the "normal" leads.   So they changed, then changed back. (series 7 and the "black" series 8 260s have the "reverse" leads)  It's all too much to keep up with. 
Robbdoe1:
Hello. I’m in the learning process of meter repair and need help from you all. I too have a very nice 461-2 that has similar responses to the original post. I seem to get random numbers on the display. The volts in both AC and DC don’t respond to any input. All the resistance ranges display a 1 when either the leads are shorted or any resistance measured the display starts to show numbers that always count down to -000. I’m doing my tests with no batteries in the unit and running off the AC charger.

I’ve checked the basics like F1 and F2. I know very little about this type of logic. Based solely on the original post I jumped straight to ICL7107. According to what I see on the schematic I should have +5V between pin 1 and pin 21 of ICL7107 and I do. This is where I’m completely lost as I can see pins 30, 31 & 32 are Common, Input Hi & Input Low but don’t know how to test them and don’t want to smoke anything if possible. I have a logic probe if this is where I use it? I have used one once and that was 20 odd years ago.

Can somebody please point me in the proper direction to continue troubleshooting this meter?  Any and all help is greatly appreciated. Thank you in advance for helping me struggle through this.
Robb
Navigation
Message Index
Previous page
There was an error while thanking
Thanking...

Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod