Author Topic: Solartron Schlumberger 7151 bench multimeter teardown pics  (Read 3774 times)

iloveelectronics

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Solartron Schlumberger 7151 bench multimeter teardown pics
« on: June 26, 2014, 06:34:13 AM »
This is a 5.5/6.5-digit bench meter from 1988. I don't really need another bench meter but saw a private seller in China selling this for rather cheap and just couldn't help it. Didn't know some of these 7151 meters were actually licensed to be assembled in Shanghai, China. The Chinese text on the back panel says it was designed by Solartron in the UK but assembled, tested, and calibrated in China. It looks like a 1988 vintage judging from the date codes as well as a stamp on the inside of the top housing piece.

Calibration looks slightly out (I didn't check actual specs), based on my Agilent 34461A. It's about 3-5 count out in 5.5-digit mode (30-50 in 6.5-digit) on DCV. Didn't really check the other ranges yet.

So here goes the pictures (click to enlarge):


The Chinese voltage reference is marked as 5.00090V. 6.5-digit mode.


10.00007V. 6.5-digit mode.


Up pops the cover. You can see a date stamp on the dark underside that reads "Apr 1988".










Looks like some leakage and corrosion on the electrolytic caps.


The 3.6V battery measures only 0.57V. Someone corrects me if I'm wrong but I think it's only used for the real time clock?


Another board.






The back panel, with the Chinese text saying the unit was designed in the UK but assembled, tested and calibrated in China.


Everything looks original to me and it doesn't look like it's been repaired or anything so I'm overall pretty pleased with the purchase. But as I said I don't really need it so I'll probably just hang on to it for a little longer and then sell it on for costs+change :)
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SeanB

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Re: Solartron Schlumberger 7151 bench multimeter teardown pics
« Reply #1 on: June 26, 2014, 11:51:21 AM »
Nice meter there, just needs that battery changed out rather sharpish, as it is leaking and will destroy the board around the power supply very quickly. It already is doping this, so snip it out, and clean the board with vinegar to neutralise the KOH electrolyte, then rinse well with soap and water and scrub it well.

Mr Eastwood

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Re: Solartron Schlumberger 7151 bench multimeter teardown pics
« Reply #2 on: July 05, 2014, 08:35:30 AM »
Hi, did you connect the test leads together and "null" the meter before you measured?   I have the 7150 and I normally leave it on for 30 mins then null it before taking any measurements.
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