SENSTAR OmniTrax - Cable-Pair Continuity Test (Network Decouplers)

Cable tests
OmniTrax Product Guide Page 151
Cable-pair continuity test (network decouplers)
1. At each processor, disconnect the sensor cables that are being tested (TX and TX OR RX and
RX).
2. At one end of the cable-pair, short the center conductor to the connector shell.
3. At the other end of the cable-pair, set a digital multimeter to measure resistance and attach it
to the center conductor and shell of the corresponding connector.
• For OC2 cable, a resistance of between 5 and 20
 confirms continuity.
• Infinite resistance means the cables are not connected or are incorrectly labelled. Re-label
or repair as required.
• A zero reading indicates a short. Check the jumper and meter clips and repair as required.
Figure 135: Cable-pair continuity test
Note For SC1/SC2 sensor cable the resistance should be approximately 3

per 100 m of cable.
Note For standalone decouplers in a cable pair, do not short the center-pin to
the shield at one end of the cable. Measure the resistance between the
center-pin and the shield at both ends of the cable. The resistance
reading should be 130 k
±5% at each end.
PEAK
HOLD
ON OFF
DC
AC
TEMP C
2000 mA
200 mA
20 mA
2 mA
200 mV
200¦
2
20
200
1000 DC
750 AC
20M
2000k
200k
20k
2k
200 nS
mA
V
*C
S
¦
mA *C
V ¦
S
R
X
B
R
X
A
T
X
A
T
X
B
multimeter
multimeter
shield to center
receive
cables
connectors
short shield to
center conductor
network decouplers
transmit
cables