The shunt resistor is across the meter to set the working range of
application for the FSD corresponding to the full range of measurement.
, that's why it is called a shunt resistor. The protection diodes are in
parallel, and so is the meter.
https://www.youtube.com/watch?v=Q-CE-ZbBuTQ
Your statement is technically incorrect.
Maximum Forward Voltage Drop per element at 1.0A DC -*1.1*V Once it
shorts VD falls closer to zero.
On 18/5/20 6:59 pm, Steve Thompson wrote:
Rich was talking about putting diodes across the current measuring
resistor, not directly across the meter itself. Typically the resistor
generates something in the region of 0.5-2V which the meter reads via
a series resistor.
Most moving coil movements need less than 10mA and less than 0.2V to
go to full scale. A meter which reads higher current without external
resistors will almost certainly have an internal shunt. If you're
trying to protect a meter with an internal shunt you probably need to
look at the biggest Shottky diodes you can afford as they conduct at
lower voltages than silicon ones.
At 20+A glitch current, the voltage across a 1N5400 type diode will be
in the order of 1.5-2V.
Steve G8GSQ
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