Campbell Scientific CR5000 Measurement and Control Module - Manual (Page 131)

Section 7. Measurement Instructions
7-5
Parameter
& Data Type
Enter
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
MeasOfs
Constant
Code Value Result the Ground offset voltage is subtracted from single
ended measurements.
False 0 Offset voltage is corrected from background calibration
True ≠0 Offset voltage is measured each scan
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. See the
measurement description for the units of the raw result; a multiplier of one and an offset
of 0 are necessary to output in the raw units. For example, the TCDiff instruction
measures a thermocouple and outputs temperature in degrees C. A multiplier of 1.8 and
an offset of 32 will convert the temperature to degrees F.
7.3 Half Bridges
BrHalf (Dest, Reps, Range, SEChan, ExChan, MeasPEx, ExmV, RevEx,
SettlingTime, Integ, Mult, Offset)
X = result w/mult = 1,
offset = 0
X
V
V
R
R R
x
s
s f
= =
+
1
This Instruction applies an excitation voltage, delays a specified time and then makes a
single ended voltage measurement. The result with a multiplier of 1 and an offset of 0 is
the ratio of the measured voltage divided by the excitation voltage.