[Milsurplus] RE-2 meter

[Mark K3MSB]

Thanks Elden.

19.5 mV with a 3 ohm internal resistance yields 6.3 mA FS, which is close
to my 5 mA measured on two different meters.  Being 85 years old, I find
the difference understandable.

The markings on the Thermocouple do indeed indicate a max of 0.75 A:

[image: image.png]


I have a problem with the chart.   With a 3 ohm internal resistance,
here's the voltage across the meter with the indicated current values:

[image: image.png]

With a meter reading of 1,  the voltage across the meter is 18X the FS
value of 19.5 mV.

If 19.5 mV is FS, and that's with 0.75 A through the meter,  then the
internal resistance is 0.026 ohms, which is in the ballpark of my value of
0.033 ohms.

73 Mark K3MSB





On Tue, Jun 17, 2025 at 5:53 PM elden meyer via Milsurplus <
milsurplus at mailman.qth.net> wrote:

> Good Afternoon,
>
> In the June 1963 Surplus issue of 73 magazine Roy Pafenberg writes about
> the antenna relay.
>
> He gives this data:
>
> meter only - 3 ohms DC resistance, 19.5 millivolts full scale
>
> with thermocouple -
> reading , RF amps
> 1  , 0.12
> 2  ,  0.18
> 3  , 0.22
> 4  , 0.26
> 5  , 0.32
> 6  , 0.37
> 7  , 0.43
> 8  , 0.50
> 9  , 0.59
> 10 , 0.75
>
> Elden
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