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Posted to uk.d-i-y
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Reccomendation for small analogue multimeter
wrote:
Doesn't have to be fantastically acurate, but something that's built to
last would be good.
One of the little Ancient AVOs (Multiminor ?) would be lovely, but a
quick search on Ebay shows that they are made of unobtainium :=((
So, what's the modern equivalent?
Incidently, if anyone would like an old AVO 7 (might be AVO 8, it's a
long time since I looked at it). Drop me a mail and we can haggle.
A lot depends on what you are going to use it for.
The old Avo Minor drew about 2.5 milli amps from the circuit, if I
remember, when measuring volts. (I have one and I use it for measuring
current, as it does not have a large voltage drop across it, like some
of the modern ones do)
It was useful for measuring Volts on some jobs, but not those where the
current flowing through the circuit was tiny. This was why the more
modern, high impedance meters were introduced. They didn't load the
circuit being measured. However, they are prone to measuring stray
signals that are not your target.
I used to work on aircraft and at times I had to measure the flap/slat
asymmetry voltages. This is a system on the A/C that detects that the
two sides of the A/C are in sync. Use a modern, high impedance input DVM
and you could not get a correct reading. Use a much older type and
everything was OK.
Post what you want it for and I am sure someone will point you in the
right direction. Other than that, use your old Avo 7/8. a very good
instrument.
Dave
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