RS PRO RSDM-9060, User Manual

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Diagram
Fuse
Rshunt
Rline
3A
Rline
HI
LO
DMM INPUT
Example
Vs = Voltage source
RLoad = Load under test
Rint = Current terminal total impedance
containing Fuse + Rline
Rline + Rline Rline
When different current range for measurement is
selected, Rshunt will vary accordingly.
For example,
Vs = 10V, Rload = 10 Ω, Vs = 10V, Rload = 10 Ω
If the total impedance passing through current
terminal is Rint = 0.5Ω, the ideal measured voltage
will be 10V regardless of impact on load from
voltmeter input impedance. The calculation for
actual measured value is 10V * =
9.52381V.
Error (%) = * 100, this error is
applicable to not only DC but AC measurement as
well. The influence will be probably more serious
depending on varied actual conditions.