11
V1.0 Oct 2020
7.0
TROUBLESHOOTING
RESISTANCE DIAGNOSTICS
Where damage to a sensor or cable is suspected this guide illustrates the way in which
simple resistance checks can be taken to identify the possible cause of the problem.
Resistance checks can be made with most types of multi
-
meter which are readily
available in the market.
RESISTANCE OF THE THERMISTOR
STEP 1
Set the range to 20k
Ω
(or
Ω
if using a multi
-
meter which has automatic ranging).
STEP 2
Connect the T+ (green) conductor to the red lead on the multi
-
meter and the T
-
(white)
to the black lead on the multi
-
meter.
The readings will be dependent on the temperature as below:
-
10°C ~ 5.971k
Ω
(5971
Ω)
15°C ~ 4.714k
Ω
(4714
Ω)
20°C ~ 3.478k
Ω
(3478
Ω)
25°C ~ 3.000k
Ω
(3000
Ω)
PLEASE REFER TO THE THERMISTOR LOOK UP TABLE ON THE NEXT PAGE
