BEAMEX MC5P - Resistance and RTD Measurement, Connections; 4-Wire System

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Resistance and RTD Measurement, Connections
The two main problems in resistance and RTD measurement are
the effects of wiring resistances and thermovoltages in the resis-
tance measurement circuit. If possible, use 4-wire connection to
eliminate the effect of wiring resistance. The special resistance
measurement sequence of MC5P eliminates the thermovoltages of
the resistance measurement circuit.
MC5P continuously checks the connection type during resistance
and RTD measurement. The found connection type is displayed on
the resistance or RTD measurement window.
3-wire System
MC5P sources current through the resistor
from the two left side terminals. MC5P mea-
sures the voltage drop across the entire
current loop and across the low side con-
nection wire. If both left side connection
wires are identical, MC5P can compensate
for the resistance of the connection wires.
4-wire System
MC5P sources current through the resistor
from the two left side terminals. MC5P mea-
sures the voltage drop across the resistor
from the two right side terminals. The 4-
wire method gives the resistance between
the terminals of the resistor, it is insensi-
tive to the resistance of the connection
wires.
S/N
Max 60 VDC/30 VAC
OUTPUTSENSOR MEASURE & SIMULATE
T/C, Low V
4-w meas
R, RTD
V, I,
3 & 4-w meas
R, RTD
S/N
Max 60 VDC/30 VAC
OUTPUTSENSOR MEASURE & SIMULATE
T/C, Low V
4-w meas
R, RTD
V, I,
3 & 4-w meas
R, RTD
Additional Information