Campbell Scientific CVD20 20:1 Voltage Divider - Manual (Page 9)

CVD20 20:1 Voltage Divider
The multiplier to use with the voltage measurement must take into account the
divisor, the calibration of the sensor, and the units desired for the result.
6.1 Examples
Suppose the user wants to measure a sensor with a 0 to 5 V output. Using the
CVD20 20:1 voltage divider, the 5 volt output will be divided to 5/20 = 0.25 V
or 250 mV. Thus the voltage range on which to make the measurement is the
±250 mV range for the CR800, CR850, CR1000, and CR10(X) and the ±1000
mV range on the CR3000 and CR5000.
The CVD20 divides the voltage by 20 and the datalogger reads it as millivolts
(i.e., (V/20) x 10
3 = V x 50). Therefore, to output directly in volts, use a
multiplier of 1/50 or 0.02.
The following examples show the measurement instruction for each of the
different dataloggers to measure the sensor described above.
6.1.1 CR1000, CR800, CR850
Public SensVolt
VoltDiff (SensVolt,1,mV250,1,True,0,250,0.02,0)
6.1.2 CR3000, CR5000
Public SensVolt
VoltDiff (SensVolt,1,mV1000,1,True,0,250,0.02,0)
6.1.3 CR10(X)
1: Volt (Diff) (P2)
1: 1 Reps
2: 24 ± 250 mV 60 Hz Rejection Range
3: 1 DIFF Channel
4: 1 Loc [SensVolt]
5: 0.02 Mult
6: 0 Offset
3