Author Topic: Cheap £5 (AU$8) Multimeter accidental destruction test  (Read 9848 times)

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Offline raymondclark0Topic starter

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Re: Cheap £5 (AU$8) Multimeter accidental destruction test
« Reply #25 on: May 23, 2013, 02:59:23 pm »
Quote
A 3458A would've not fared well under the same conditions either.

I'm not so sure,  the Agilent would probably will have proper input protection like HRC fuses and HV Slots in the board preventing any damage beyond the fuse.  I was kind of wanting to try this with my fluke under controlled conditions to see if it would hold up OK, as I'm sure it would, (it does say min fuse interrupt rating 17,000A on the back),  but I didn't want to take the risk of damaging it. (maybe if I was ridiculously rich I would)
 

Offline Monkeh

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Re: Cheap £5 (AU$8) Multimeter accidental destruction test
« Reply #26 on: May 24, 2013, 01:35:02 am »
(3) Unless you absolutely have to,don't hold the meter,place it on the ground,or some other convenient surface---the AVOs were so damn heavy,we were usually happy to do this! ;D

An Avo won't read accurately unless laid on a level surface anyway.
 

Offline c4757p

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Re: Cheap £5 (AU$8) Multimeter accidental destruction test
« Reply #27 on: May 24, 2013, 02:05:52 am »
Really? My Heathkit meter reads fine at all angles, even upside down, as long as the meter movement is properly balanced. (A ridiculous pain in the ass to do, unfortunately, if it's out of balance...)
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Offline Monkeh

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Re: Cheap £5 (AU$8) Multimeter accidental destruction test
« Reply #28 on: May 24, 2013, 02:08:51 am »
Really? My Heathkit meter reads fine at all angles, even upside down, as long as the meter movement is properly balanced. (A ridiculous pain in the ass to do, unfortunately, if it's out of balance...)

Avo's are very, very sensitive. They do not like being used at angles, nor do they like shocks without the movement being dampened (which was not available as a specific knob setting until later models).

They're amazingly accurate for analog meters when properly balanced and used, though.
 

Offline c4757p

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Re: Cheap £5 (AU$8) Multimeter accidental destruction test
« Reply #29 on: May 24, 2013, 02:19:01 am »
Interesting. When I balanced my Heathkit, I put tiny spots of hot glue on the weights to keep them from moving around, and that seems to have held it. It's been around a year, and I'm sure it's been bumped around quite a bit through two complete workbench migrations. Everything on my bench went through accuracy checks after all that abuse, and it all checked out just fine!

Of course, Avos are traditional analog meters IIRC, powered from the measurement being made. The Heathkit buffers the input with a triode differential amp (it has 10M input impedance just like a DMM  :-+), so it's able to use a stiff movement with a higher current requirement.
No longer active here - try the IRC channel if you just can't be without me :)
 


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