Mantracourt Electronics Limited
PSDS User Manual
25
Six (6) Wire Measurement Explained
The PSD utilizes a six wire measurement system to achieve maximum accuracy when connecting to a strain bridge
sensor.
Four wire strain bridge sensor can still be used but please review the recommendations below to get the best out
of the measurement system.
A six wire measurement system has one very big advantage over a four wire measurement system in that the
length of the cable connecting the handheld to the strain bridge sensor can be compensated for in terms of
losses along its length.
Meaning that even after calibration the sensor’s c
ables may be lengthened or shortened
without affecting the integrity of the calibration.
The disadvantage is that the handheld needs all six wires connecting even if using a four wire strain bridge sensor.
Wiring a Six Wire Strain Bridge Sensor
Where possible six core cable should be used to connect the strain bridge sensor directly to the PSD connector.
If the cable has twisted pairs refer to the wiring table above where it is indicated which connections should share
a twisted pair. Note that shield connections are described further on in this section. Also note that the extra two
cores required for TEDs connection (If used) are not shown in the diagram.
Wiring a Four Wire Strain Bridge Sensor (Existing four wire cable)
If is not possible to run six core cable direct to the strain bridge sensor, or the strain bridge sensor is supplied
with four core cable connected, then the sense connections will need to be made at the PSD connector end. See
previous section for recommended method of connecting a single core cable to two connector pins.
If the cable has twisted pairs refer to the wiring table above where it is indicated which connections should share
a twisted pair. Note that shield connections are described further on in this section.