Escort 3016B - Manual (Page 136)

17 Appendix
Page 7
17.3. Accuracy of the PT100 measurements
The measurement inaccuracies thereafter are given as maximum values: typical values are 2 to 3
times less.
The measurement accuracy in temperature is the sum of several possible sources of inaccuracy:
Pl: accuracy of standardisation
Pz: zero accuracy
Pm: accuracy of the measurement of the equivalent voltage
Pd: accuracy of the measurement offsets
The total accuracy is then: Pt = Pl + Pz + Pm + Pd
For the recorder:
Pl = 0.25 C for the PT100
Pz = 0.25 C for the PT100
Pd = 0.10 % of the offset
Pm = given in the tables
Measurement accuracy: Pm
The measurement accuracy Pm depends on the voltage range used by the appliance. The
measurement error in degrees will then be the measurement error in voltage divided by the slope in
V/ C.
For all the voltage ranges, the accuracy is +/-0.1% +/- 10 V.
Slope dependiing of temperature :
Temperature ( C) -200 -100 0 200 400 600 800
Slope ( V/ C) 378 354 342 321 301 281 260
Equivalent voltage measurement accuracy at 0 C :
Range
Temperature Tension Max error
( V)
Max Error
( C)
20 10 20 0.06
50 20 30 0.09
100 50 60 0.18
200 100 110 0.32
500 200 210 0.60
1000 500 510 1.50
2000 1000 1010 3.00
Range
EXAMPLE OF ACCURACY CALCULATION
The measurement is about 240 C made with the 500 C range, centered on 0 C (non zero offset)
with a PT100 probe.
Pt = Pl + Pz + Pm + Pd