where:
T
c
= temperature in degrees Celsius (°C)
A
1
= 8.271111E–4
B
1
= 2.088020E–4
C
1
= 8.059200E–8
1
Coefficients provided by Measurement Specialties™.
8.3 Electrically noisy environments
EMF noise emanating from the ac mains power grid can be a significant source of measurement
error. 60 Hz noise is common in the United States. 50 Hz noise is common in Europe and other
regions. This noise can usually be filtered out.
The following code snip examples filter 60 Hz noise.
CR6-series data logger example:
Therm108
(T108_C,1,U1,U10,0,
60
,1.0,0.0)
CR800-series and CR3000 data loggers example:
Therm108
(T108_C,1,1,Vx1,0,
_60Hz
,1.0,0.0)
8.4 Long cable lengths
Long cable lengths (>50 ft) may require longer than normal analog
ue
measurement settling
times.
Enter a longer settling time in the
SettlingTime
parameter of the
Therm108()
instruction.
Campbell Scientific suggests doubling the settling time every 50 ft. The following
code snip
examples increase settling time by 20000 µs by placing
20000
as the argument in the
SettlingTime
parameter:
CR6-series data logger example:
Therm108
(T108_C,1,U1,U10,
20000
,60,1.0,0.0)
CR800-series and CR3000 data loggers example:
Therm108
(T108_C,1,1,1,
20000
,_60Hz,1.0,0.0)
108 Temperature Probe
11
