Campbell CR800 Specifications Page 165

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Section 7. Measurement Instructions
Parameter
& Data Type
Enter
ExChan
Enter the excitation channel number to excite the first measurement.
Constan
Alpha
Code
Code/
Channel
Result
VX1 1 Switched excitation channels, are switched to the excitation
voltage.
VX2 2 for the measurement and switched off between measurements.
VX3 3
ExmV
Constant
The excitation voltage in millivolts. Allowable range ± 2500 mV.
XDelay
Specifies the length of time the excitation is enabled, after which, the channel is
set low and the datalogger moves on to the next instruction. If XDelay is set to
0, the excitation will be on until the end of the program scan or until another
instruction sets an excitation voltage.
SW12 (State)
The SW12 instruction is used to set a Switched 12-volt supply high or low.
The datalogger has a switched 12-volt output with two terminals. This
switched 12 volts is used to provide a continuous 12-volt supply to external
peripherals. At room temperature the switched 12-volt supply can source 900
mA between the SW-12 terminal and Ground. The State parameter indicates
whether the switched 12 volts is High (non-zero) or low (0).
The SW-12 supply is unregulated and can supply up to 900 mA
at 20C and up to 630 mA at 50C. A resettable polymeric fuse
protects against over-current. Reset is accomplished by
removing the load or turning off the SW-12 for several seconds.
NOTE
Parameter
& Data Type
Enter
State
The value of this parameter determines if the 12V is on or off
Value Result
0 The SW-12 ports are switched off (0V)
Constant
Variable or
Expression
0 The SW-12 ports are switched On (Connected to supply
voltage)
7.6 Self Measurements
Battery (Dest)
This instruction reads the battery voltage and stores it in the destination
variable. The units for battery voltage are volts.
7-11
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