[Amps] Westinghouse BC Ammeter QX-37

[RICHARD GEORGE]

Put the amp meter in the negative lead of the power supply


K6KWQ Dick "12 Volt radios are for wimps, real radios can kill you" Still can't make it go QRO with "More Power"
  ----- Original Message ----- 
  From: HAROLD B MANDEL<mailto:ka1xo at juno.com> 
  To: amps at contesting.com<mailto:amps at contesting.com> 
  Sent: Sunday, January 08, 2006 7:36 AM
  Subject: [Amps] Westinghouse BC Ammeter QX-37


  Gents,

  Phil at Fair Radio just sent up a couple of 4"
  square matching meters for my latest project.

  They are Westinghouse Type QX-37's, one being
  the 0 - 5KV voltmeter and the other being the
  0 - 2 amp D.C. ammeter.

  The voltmeter says it needs a 5Meg multiplier
  right on the face, but the ammeter just says
  "Style 1546677."  (& Type QX-37)

  Opening the case of the ammeter I see a metal
  zig-zag resistor between the poles with flexible
  wires going from each end of this resistor to the meter
  movement. I perceive this as an internal shunt.

  The meter's cold resistance is 0.33 ohms.

  The power supply is rated at 2545 VDC at 1.5 amperes.

  Hence, the power supply runs 3817.5 Watts through
  the amplifier.

  My question is twofold:

  1. Will this ammeter be able to handle 2545 volts?
  2. Does this ammeter need another external shunt?

  Thanks!

  Harold Mandel
  W4HBM
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