42
V1.0 September 2017
8.0
TROUBLESHOOTING contd
….
Fault finding assistance for the cabling :
-
Using a Resistance meter or Electrical Multi
-
meter set to measure resistance, check the
resistance between each conductor and between each conductor and the drain wire or
screen.
There should be a VERY high, or infinite electrical resistance between the conductors
and the drain or screen (a value in M
Ω’
s is acceptable).
None of the individual conductors should be shorted to the screen or drain wire
(showing Zero resistance) and none should be shorted together (showing Zero re-
sistance).
As a terminal resistor is fitted to a string of IPI sensors, the resistance between the Yel-
low and the Green conductors and the should be in the order of 100
-
140Ω.
The electrical resistance between the Brown and White, the power conductors will vary
significantly depending on the number of sensors in the string. The resistance should
never be Zero and should not exceed
2000Ω.
