[Amps] What's wrong here- dropping resistor for DC meter?

[Fuqua, Bill L]

Was the meter linear to start with?
Did you check it with a variable DC supply and another meter?
How many resistors and what types are in the string?
What is theinternal  resistance of the meter?
Also, your meter is interesting in that it has a 1 to 5 volt movement and
not a 0 to 5 volt.

73
bill wa4lav

________________________________________
From: amps-bounces at contesting.com [amps-bounces at contesting.com] On Behalf Of Ed Heimbach [supermechanic18360 at yahoo.com]
Sent: Saturday, July 09, 2011 8:06 AM
To: Amps at contesting.com
Subject: [Amps] What's wrong here- dropping resistor for DC meter?

 Want to meter HV out. Power supply variable from 0 through 4.5 kv dc
 Have 1 through 5 v DC movement.
 I built dropping resistor string to multiply meter by 1000X.
 Meter now has a non-linear response.
 I.E., 1 volt position corresponds to 1000 volts, 3.25 volt on meter scale  equals 4.5kv.

It would be nice if my max. volts (4.5 k) corresponded with the 4.5 mark on the scale card.

 Easy way out would be to  jiggle resistor values to get mid point on scale (2.5 volts) to correspond with 2.5 kv, and then make new meter scale to agree with indicating needle.

 Any better solutions?

73 ab3ht

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