Campbell Scientific CS11-L Current Transformer - Manual (Page 33)

Appendix A. Theory of Operation
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
0
-20
-40
-60
-80
20
40
60
80
Samples
mV
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
1250
1200
1150
1100
1300
1350
1400
Samples
mV
1250 mV Offset (needed for CR200X)
0 mV Offset for Dataloggers other than CR200X
FIGURE A-8. Adding 1250 mV creates positive output
1000
500
0
1500
2000
2500
mV
Adjusted Measurement Range
mV signal CR200X
FIGURE A-9. CS11-L measurement range
A.6 Multiple Passes Through the Sensor
Multiple passes can pass through the sensor to amplify the signal of the
amperage being measured (FIGURE A-10). However, the multiplier will need
to be changed, depending on how many passes through the sensor.
The range code needs to be changed to match the number of wire
passes through the sensor. NOTE
Passes New Multiplier Range Code
2 0.1 x2
4 0.05 x4
5 0.04 x5
8 0.025 x8
10 0.02 x10
20 0.01 x20
A-5