Products > Test Equipment
Test Equipment Anonymous (TEA) group therapy thread
Specmaster:
--- Quote from: bd139 on June 18, 2018, 09:20:37 pm ---Fixed the PL310 already. Reseated the driver board connector and all is fine.
--- End quote ---
Shades of my 1740A there.
Specmaster:
Got the 1400 meter, gave it a quick wipe over, it was filthy, more cleaning tomorrow, battery and holder was corroded and broken, new unit arriving in a couple of days, hooked up power supply and tested Ohms ranges, all seems to be Ok there. Volts are slightly off but there are 6 trimmers but not marked what does what, so a little experimentation to be done.
Meter itself is in almost new condition, one screw that holds the leather handle on is broken, probes not up to today's standards, carry case is a bit ropey and catch is rusty but it did its job and protected the meter. It even has the original users manual, just as well because info on the web about this is as plentiful as that alleged pot of gold at the end of the rainbow :-DD
To give an idea as to the size, it the same depth and width as a AVO 8 but 15mm taller and the meter scales are the same size. All things considered I'm very happy with the price I paid for this, another specmaster special, just £7.50
Here are a few photos so far. I will photo the guts when I get the battery holder, it is different to the pictures I posted from the web.
bd139:
Looking good. I've seen the same thing happen to earlier Thurlby battery holders made out of white plastic. They appear to go brittle and smash under stress.
Cerebus:
--- Quote from: bd139 on June 18, 2018, 10:54:02 pm ---Looking good. I've seen the same thing happen to earlier Thurlby battery holders made out of white plastic. They appear to go brittle and smash under stress.
--- End quote ---
I've seen that before too.
Just out of curiosity I had a go at looking up the mechanism and it looks like it might be stress corrosion cracking. A close look at the broken edge would be diagnostic as SCC leaves a very characteristic pattern. The permanent stress from the battery holder acting as a spring, combined with crack tip corrosion from residual electrolyte left behind after a leaked battery is cleaned up would appear to be a viable culprit. That suggests that if you have a nylon battery holder and its subjected to a leaking battery you ought to replace, rather than clean up, the battery holder.
I know way more than any non-materials scientist ought to know about SCC as a former flatmate did his final year university project (and subsequent PhD) on SCC and, frankly, he became a bit of a bore on the subject but it's an ill wind and all that and I ended up with quite an education in the subject. I keep on freaking out metallurgists and material scientists by even knowing what SCC is, let alone being capable of having a moderately informed conversation about it - it's surprising how often it's come up in conversation.
Specmaster:
--- Quote from: Cerebus on June 19, 2018, 12:10:36 am ---
--- Quote from: bd139 on June 18, 2018, 10:54:02 pm ---Looking good. I've seen the same thing happen to earlier Thurlby battery holders made out of white plastic. They appear to go brittle and smash under stress.
--- End quote ---
I've seen that before too.
Just out of curiosity I had a go at looking up the mechanism and it looks like it might be stress corrosion cracking. A close look at the broken edge would be diagnostic as SCC leaves a very characteristic pattern. The permanent stress from the battery holder acting as a spring, combined with crack tip corrosion from residual electrolyte left behind after a leaked battery is cleaned up would appear to be a viable culprit. That suggests that if you have a nylon battery holder and its subjected to a leaking battery you ought to replace, rather than clean up, the battery holder.
I know way more than any non-materials scientist ought to know about SCC as a former flatmate did his final year university project (and subsequent PhD) on SCC and, frankly, he became a bit of a bore on the subject but it's an ill wind and all that and I ended up with quite an education in the subject. I keep on freaking out metallurgists and material scientists by even knowing what SCC is, let alone being capable of having a moderately informed conversation about it - it's surprising how often it's come up in conversation.
--- End quote ---
Yeah, I'm replacing it with a black one, not sure what the precise material is though.
From mobile device so predictive text might have struck again [emoji83]
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