Campbell Scientific CVD20 20:1 Voltage Divider - Manual (Page 7)

CVD20 20:1 Voltage Divider
1. Introduction
The CVD20 provides six single-ended or six differential channels for
connecting sensors that have a higher voltage output than what a datalogger
can measure. Resistors in the CVD20 divide the sensor's signal voltage by a
factor of 20.
2. Cautionary Statements
The CVD20 is rugged, but it should be handled as a precision scientific
instrument.
3. Initial Inspection
Upon receipt of the CVD20, inspect the packaging and contents for damage.
File damage claims with the shipping company.
4. Specifications
Compatibility: CR800, CR850, CR1000, CR3000, CR5000,
CR9000(X), CR7, CR10(X), CR23X, 21X.
Number of Channels: 6 single-ended or 6 differential
Division Ratio: 20:1
Resistors: 1 kohm and 19 kohm
Ratio Tolerance (@ 25°C): ±0.1%
Weight: 91 g (3 oz)
Dimensions: 9.4 x 6.9 x 3.8 cm (3.7 x 2.7 x 1.5 in.)
Temperature Coefficient: 10 ppm/°C from -20° to +85°C
5. Installation
5.1 Mounting
The base of the voltage divider has keyed slots for two screws. The slots are
spaced for mounting the prepunched holes on the back plate of a Campbell
Scientific enclosure.
5.2 Wiring
Figures 1 and 2 show the wiring for single-ended and differential
measurements, respectively. The CVD20 connects to the sensor via the
sensor's cable. The cable used to connect the CVD20 to the datalogger
depends on the number of single-ended or differential channels used (see Table
1