[Test-Equipment] HP 403B pegging meters

[Robert Roehrig (K9EUI)]

----- WA5CAB at cs.com wrote:
> I'm not familiar with this instrument  (and forget what the original
> post 
> said it even did)  But as in this case, it doesn't appear that the
> absolute 
> reading accuracy of the meter is critical (one respondant reported
> using a 0-500 uA 
> movement as a substitute), one could series a current limiter set to
> say 125 
> uA.  I don't know that anyone builds and sells a range of 2-terminal
> devices 
> but they might.  Or you could build or buy a 3-terminal one.
> the normal safety specs for the meters.

I also am not familiar with  that instrument, But I hate having any instrument that has a meter that pegs. In a few cases, especially where the meter reading may be relative rather than absolute (such as my grid dipper) I have installed a series resistor and a clamp diode across the meter movement.


-- 
Bob Roehrig
630-844-4898
A.U. Telecom dept.
K9EUI  WD2XSH/19  W9ZGP