Campbell Scientific CR5000 Measurement and Control Module - Manual (Page 135)

Section 7. Measurement Instructions
7-9
BrFull6W (Dest, Reps, Range1, Range2, DiffChan, ExChan, MeasPEx,
ExmV, RevEx, RevDiff, SettlingTime, Integ, Mult, Offset)
X = result w/mult = 1, offset = 0
X
V
V
R
R R
R
R R
= =
+
−
+
⎛
⎝
⎜
⎞
⎠
⎟ 1000 1000 2
1
3
3 4
2
1 2
This Instruction applies an excitation voltage and makes two differential
voltage measurements. The measurements are made on sequential channels.
The result is the voltage measured on the second channel (V2) divided by the
voltage measured on the first (V1). The result is 1000 times V2 / V1 or
millivolts output per volt of excitation. The connections are made so that V1 is
the measurement of the voltage drop across the full bridge, and V2 is the
measurement of the bridge output.
Full Bridge Parameters
Parameter
& Data Type Enter
Dest
Variable or
Array
The Variable in which to store the results of the instruction. When Reps are used the
results are stored in an array with the variable name. An array must be dimensioned to
have elements for all the Reps.
Reps
Constant
The number of repetitions for the measurement or instruction.
Range
Constant
Alpha Code Numeric
Code Voltage
Range
mV5000 0 ± 5000 mV
mV1000 1 ± 1000 mV
mV200 2 ± 200 mV
mV50 3 ± 50 mV
mV20 4 ± 20 mV
AutoRange 5 mV20 - mV5000 Selects range (Sect. 3.1)
mV200C
mV50C
mV20C
20
30
40 ± 200 mV
± 50 mV
± 20 mV
The mV200C, mV50C, and mV20C
ranges pull the channel into common
mode range and check for open input
DiffChan
Constant
The differential channel number on which to make the first measurement. When Reps are
used, subsequent measurements will be automatically made on the following differential
channels. If the channel is entered as a negative number, all reps occur on that channel.