[Test-Equipment] Weston 1946T

[Mark Donaldson]

Assuming you have the movement in hand the best way is direct measurement. Put a resistor in series with the movement, start with 100K Ohm and hook up to a variable power supply adjust power supply and/or series resistor to get full scale deflection on your meter.
Now put a pot across the terminals of the meter and adjust it until you get half scale deflection on the meter. Measure the value of the pot, this will be the value of the internal resistance of the meter. Remove the pot, you should now be back to getting full scale deflection on the meter. Now measure the value of the voltage source you are using to get full scale deflection and measure the value of the series resistor. Add the value of the series resistor to the previously measured internal resistance of the meter. Take the value of the voltage source and divide it by the sum of the series resistance and the internal resistance of the meter and you will get the FS current of the meter. 

    On Friday, January 1, 2016 2:39 AM, "k4pf at juno.com" <k4pf at juno.com> wrote:
 

 
> Glenn Little WB4UIV <glennmaillist at bellsouth.net> wrote
> Where can I find the basic movement FS current for this meter?

Hi,

This photo from an eBay seller shows 100uA f.s. printed
on the dial scale for the 1946T : 
http://www.ebay.com/itm/Weston-1946T-Volt-Meter-New-/331302934793

73,
Ed Knobloch
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