I do use a Fluke brand multi meter with the set up I described, I
should have mentioned that. The circuit layout does work
pretty well for me.
I have noticed that even the small Fluke Meter internal
resistance can and does change the loop current, more
than one might imagine.
I don't like using Multi or Ohm Meters direct onto unprotected
meter movements. The classic Simpson 260 meter will
damage a 200 uA movement on the higher resistance
--------- Forwarded message ----------
From: Gary Schafer <firstname.lastname@example.org>
That won't work exactly right. If the pot in parallel with the meter
the meter resistance then the sum of the meter and parallel resistor is
of what the meter was alone. That will increase the series circuit
from what it was with just the meter so there will be more circuit
than exactly 1/2 the original current in the meter and the resistor. If
set the pot for 1/2 scale meter reading the pot and parallel resistor
each have a different current because the total series circuit resistance
changed and the circuit current is different.
It would work if you had a second meter to monitor the series circuit
and readjusted the series pot to maintain the same circuit current.
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