Sensor Selection For Temperature Measurements - Picotest M3500A User Manual

4.1.8

Sensor Selection for Temperature Measurements

The multimeter supports both thermocouple and RTD. You need to
configure the multimeter for the right sensor type, units and transducer
before conducting temperature measurements.
RTD
Definition
If the RTD is used, you have to confirm the RTD settings (incl. sensor,
units and transducer) first throught the front penal operations or the
remote control operation. For the sensor options, they are: PT100, D100,
F100, PT385, PT3916, user-defined RTD, NTCT and SPRTD. For the unit
options, they are: °C, °F and K. For the transducer options, they are: 2W
RTD and 4W RTD.
If you need to change the factors that are used to calculate the
temperature in RTD, choose user-defined RTD in which you are able to
change any factors as you wish. The default factors used are listed in
Table 4-3:
Type
PT100 0.003850
D100 0.003920
F100 0.003900
PT385 0.003850
PT3916 0.003916
NTCT 0.003850
Here is the temperature equation that is used to determine the RTD
temperature:
°
< 0
When t C :
° < <
When 0 C t 630
Table 4-3
Alpha Beta
0.10863
0.10630
0.11000
0.11100
0.11600
0.10863
[
= + +
1
R R At Bt
t 0
°
C :
65 65 65 65
Delta
1.49990
1.49710
1.49589
1.50700
1.50594
1.49990
]
( )
2 3
+ −
100
Ct t
R-zero
100
100
100
100
100
100