Campbell Scientific CR5000 Measurement and Control Module - Manual (Page 140)

Section 7. Measurement Instructions
7-14
Parameter
& Data Type Enter
CAOChan The CAO channel to set.
Constant Alpha Numeric Description
CAO1 1 CAO channel 1
CAO2 2 CAO channel 2
CAOmV
Constant or
Variable
The voltage, in millivolts, to apply to the CAO Channel. The allowable range is ±5000
mV. The voltage can be constant or a variable can be used to vary the analog output in
response to time or measurements.
Boost Sets the current that the CAO can sink (The CAO can always source up to 15 mA.)
Constant Alpha Code Value Result
False 0 Boost off: Maximum current sink 5 mA
True ≠0 Boost Enabled: Maximum current sink 15 mA
FastUpdate Shortens the execution time of the instruction and the settling time for the excitation.
Alpha Code Value Result
False 0 Settle 10 time constants (~2.6 ms)
True ≠0 Settle 1 time constant (~300 µs)
ExciteI (IxChan, IxuA, XDelay)
This instruction sets the specified current excitation channel to the current
specified.
Parameter
& Data Type Enter
IxChan Enter the current excitation channel number to use to excite the first measurement.
Constant Alpha
Code Code/
Channel Result
IX1 1 Current Excitation Channels (IxChan)
IX2 2
IX3 3
IX4 4
ExuA
Constant
The excitation current in microamps. The allowable range is ±2500 µA.
XDelay
Specifies the length of time the current channel 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, CAO, or current channel.
ExciteV (ExChan, ExmV, XDelay)
This instruction sets the specified switched voltage excitation channel to the
voltage specified. The XDelay parameter is used to specify the length of time
the excitation channel is enabled, after which, the channel is set low and the
datalogger moves on to the next instruction. If the SettlingTime is set to 0, the
excitation channel will be enabled and the voltage will be held until the end of
the program scan or until another instruction sets an excitation voltage, CAO,
or current channel.