RESISTANCE HiTESTER
RM3543

Model No. (Order Code)

Test fixtures are not supplied with the unit.
Please select an optional test fixture when ordering.

The Resistance Meter RM3543 can measure low shunt resistance values and other DC
resistance values at ahigh accuracy of ±0.16% for 0.1 mΩ and at the high resolution* of
0.01 μΩ.
*In the 10 mΩ range, at SLOW measurement speed, and with 16 averaging iterations.

Thermoelectromotive force refers to the potential difference that occurs at junctions between
different metals (see figure). Specifically, the phenomenon occurs where measurement
probes  and measurement targets come into contact, and at connections between measuring
instruments and measurement leads. The magnitude of this thermoelectromotive force varies
with the temperature of the measurement environment, increasing as the temperature
difference grows. The RM3543 includes an offset voltage correction function that applies
the measurement current in both the positive and negative directions and then uses the
resulting detected voltages to eliminate the effects of thermoelectromotive force.

The RM3543’s scaling function can correct for the difference in resistance values that are
obtained when testing a given component alone and when it is mounted on a circuit board
(due to the factors such as the effects of probing position). This feature is useful when testing low-resistance current-sensing resistors such as shunts.

The RM3543 improves contact with measurement specimens by eliminating oxide films and dirt
between the probes and specimens. By addressing faulty contact, the instrument facilitatesstable measurement and reduces the contact error rate, boosting productivity.

The presence of any foreign material between the POT and CUR measurement probes can interfere with
reliable 4-terminal connections. The RM3543 checks for probe short-circuits by measuring the resistance
value between POT and CUR while measurement is not being performed.