Campbell Scientific CR5000 Measurement and Control Module - Manual (Page 136)

Section 7. Measurement Instructions
7-10
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
VX4 4
MeasPEx
Constant
The number of sensors to excite with the same excitation channel before automatically
advancing to the next excitation channel. To excite all the sensors with the same
excitation channel, the number should equal the number of Reps.
ExmV
Constant
The excitation voltage in millivolts. Allowable range ± 5000 mV. RevEx may be used to
excite with both a positive and negative polarity to cancel offset voltages.
RevEx Code Value Result (Reversing requires twice as much time to complete)
Constant False 0 Excite only with the excitation voltage entered
True ≠0 A second measurement is made with the voltage polarity
reversed to cancel offsets
RevDiff Code Value Result (Reversing requires twice as much time to complete)
Constant False 0 Signal is measured with the high side referenced to the low
True ≠0 A second measurement is made after reversing the inputs to
cancel offsets
SettlingTime
Constant
The time in microseconds to delay between setting up a measurement (switching to the
channel, setting the excitation) and making the measurement. (1 microsecond resolution)
Entry Voltage Range Integration Settling Time
0 ± 20 mV Flash 200 µS (default)
0 All but ± 20 mV, Flash 100 µS (default)
0 All 250 µS 200 µS (default)
0 All _50Hz, _60 Hz 3 mS (default)
>=100 All All µS entered
Integ The time spent on integration in microseconds for each of the channels measured.
Constant Entry Integration
0, 200 Flash Conversion; 200 = 2 flash conversions 100 µS apart
and averaged
250; 500-16000 250 µS; multiples of 500: 250 µS integrations starting each
500 µS and averaged
_60Hz or 16667 16,667 µS (reject 60 Hz noise)
_50 Hz or 20000 20,000 µS (reject 50 Hz noise)
Mult, Offset
Constant,
Variable,
Array, or
Expression
A multiplier and offset by which to scale the raw results of the measurement.