Electrically noisy environments – Campbell Scientific CR10XTCR Thermocouple Reference User Manual
Page 10
CR10XTCR Thermocouple Reference
6
TABLE 4. Polynomial Coefficients
Coefficient
Value
C0
-53.4601
C1
90.807
C2
-83.257
C3
52.283
C4
-16.723
C5
2.211
6. Electrically Noisy Environments
AC power lines can be the source of electrical noise. If the datalogger is in an
electronically noisy environment, the CR10XTCR temperature measurement
should be measured with the AC half bridge (Instruction 5) with the 60 Hz
rejection integration option on the CR10X (see Section 13 of the datalogger
manual for more information on noise). Instruction 11's fast integration will not
reject 60 Hz noise.
Example 2. Sample CR10X Instructions Using AC Half Bridge
01: AC Half Bridge (P5)
01: 1
Rep
02: 22
7.5 mV 60 Hz rejection Range
03: 1
IN Chan
04: 3
Excite all reps w/EXchan 3
05: 2000
mV Excitation
06: 15*
Loc [:Ref_Temp]
07: 800
Mult
08: 0
Offset
02: Polynomial (P55)
01: 1
Rep
02: 15*
X Loc Air Temp
03: 15*
F(X) Loc [:Ref_Temp]
04: -53.46
C0
05: 90.807
C1
06: -83.257
C2
07: 52.283
C3
08: -16.723
C4
09: 2.211
C5
* Proper entries will vary with program and input location assignments.
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