[sdiy] 2 multimeters showing different voltages
Tim Daugard
daugard at sprintmail.com
Tue Aug 7 22:07:16 CEST 2007
> Don't forget to put a load on the 5V reg as mentioned in an earlier post. Otherwise the
reg might not regulate. Also most 7805 type regulators aren't all that accurate either.
+/- 10% for some - others are +/- 5%. From the assorment I've used on my bench and in my
equipent, they've mostly ranged from 4.8V to 5.1V. Shold be good enough to test the meter.
My biggest gripe was a high end RS Digtial multimeter with frequency mesurment that reads
60 Hz (off a transformer) as 61 Hz. Makes the meter usless for anything with much
accurracy. IIRC the meter spec says +/- 2 Hz or +/- 1 LS digit.
Tim Daugard
AG4GZ 30.4078N 86.6227W Alt: 12 feet above MSL
http://home.sprintmail.com/~daugard/synth.htm
http://home.earthlink.net/~synthfred/h_toctop.htm (Fred's online edition)
Back to lurking and doing much other computer work.
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