[Test-Equipment] Simple DC Voltage Standard?

[Brian Goldsmith]

-----Original Message-----
From: Fuqua, Bill L



Simplest solution to calibrate an analog volt meter is to use a battery,
variable voltage divider ( 10k or so) and a cheap digital volt meter across
the input to the analog voltmeter.
Any loading effects will not be an issue as long as you don't remove the
digital voltmeter. 
Oddly as it may seem the Horbor Freight  $4.95 3.5 digit multimeter is
accurate to plus or minus least digit.
I have tried many of these and they seem quite consistant in DC. Not so in
AC however.
  One down side to these cheap digital multimeters is that the input
resistance is 1MOhm. 
Just set the voltage divider output to the full scale value you want to
calibrate your meter with both meters in parallel and set it.


***Er.please tell us just how you know that the cheap digital multimeter is
calibrated correctly to begin with????

Brian G.