mynick wrote:
want to shunt a multimeter to extend it's ac ampermeter range so
measured with Rish 14s in ohm meter position about 41 ohms
and then measured with Rish 14s its own internal resistance to get 40
ohms
Is this way to much -there is some mistake?
(http://www.multimetercalibrationsaus...shmulti14s.pdf
but cannot find data about it's internal resistance!)
Well, a good way to destroy a milliammeter movement is to use an
ohmmeter to measure its resistance (POOF!).
Take an adjustable low voltage supply in series with a resistor and
tweak for full scale reading.
Then connect an adjustable resistor across the meter and adjust for
half scale reading.
Remove that resistor and measure it.
I leave the proof to the student.