
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
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 ± 2500 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
All 250 µS 450 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
250
250 µS
_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.
7.5 Excitation
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 XDelay 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.
7-10
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