[volt-nuts] Solartron / Schlumberger 7150, 7150 plus, 7151

[Robert Atkinson]

Hi Jan,
The component that fails in the Solartrons is a filter capacitor in the mains inlet. It's an easy fix. Both the 7150 and the plus will read to 61/2 digits but the accuracy is is only quoted to 51/2 digits. The plus has a slightly better short term stability but the long term is hard to compare as the 7150 is quoted over two years and the Plus for one. Good "bang for the Buck" certainly here in the UK where hundreds of military surplus ones are available. Still have one but it's been replaced as my everyday bench meter by a Keithley 197 that I picked up at a local rally for a tenner. Don't think that the seller knew that the "ERROR" display indicated that you had AC and Ohms selected at the same time :-)


Robert G8RPI.



________________________________
 From: Jan Fredriksson <jan at 41hz.com>
To: volt-nuts at febo.com 
Sent: Monday, 12 August 2013, 16:44
Subject: [volt-nuts] Solartron / Schlumberger 7150, 7150 plus, 7151
 

Throwing in my 2C on 5-1/2 - 6-1/2 digit DMMs on a budget

I have had a few Solartron / Schlumberger 7150, 7150 plus, 7151, 5-1/2
6-1/2 digit DMMs

Pro:
- available at very good prices on the net (especially in the UK?). I think
I paid around £50 for them. Except one bought brand new 20+ years ago.
- stability has been very good.
- Fairly compact boxes
- usually have GPIB
- schematics are available on the web

The 7150 are 5.5 digit, while 7150 plus and 7151 are 6.5 digit.

Con:
- There is a bad mains component causing smoke / shorts with age. Smokes
and smells badly so it is easy to find :-) I do not remember details but
gave a 7150 away when it smoked. The guy who got it fixed it.
- 2A max DC current range
- 2kohm min resistance range.
- Terminals are banana jacks without binding posts

A 7151 attached under a shelf over the workbench is my daily DMM. It is
turned on 24/7....

JF
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