RM-4339 Calibration Procedure
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© National Instruments
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9
d.
Compare the values obtained in step c with those in Table 5.
e.
Clear the task by calling DAQmx Clear Task.
Quarter-Bridge Shunt Calibration Accuracy Verification
Complete the following procedure to verify the quarter-bridge shunt calibration accuracy of the
RM-4339:
1.
Set the calibrator to standby mode (STBY).
2.
Using an RJ50 cable connect the calibrator to the channel of the RM-4339 you want to
verify.
Note
Only one channel can be connected to the calibrator at a time.
a.
Connect EX+ (pin 6) to
Ω
HI, connect QTR (pin 5) to
Ω
LO and connect AI+ (pin 2)
to
Ω
LO as shown in Figure 2.
Figure 2.
RJ50 to Calibrator Connections
b.
QTR and AI+ must be connected together at the calibrator. The EX+ lead wire and the
QTR lead wire must be the same length.
3.
Set the calibrator output to 120
Ω
, 350
Ω
, or 1000
Ω
depending on the quarter-bridge
configuration you want to verify. This must match the configuration setting made in step 6 a.
4.
Set the calibrator output for compensation off (COMP off).
5.
Set the calibrator to operate mode (OPR) to enable the output.
Table 5.
Offset Voltage Accuracy Limits
Range (V)
Test Point (V)
Lower Limit (V)
Upper Limit (V)
Minimum
Maximum
-0.1
0.1
0
-0.000010
0.000010
C
a
li
b
r
a
tor
RJ50 Connector
on the RM-4
33
9
HI
LO
EX+ (pin 6)
AI+ (pin 2)
QTR/R
S
-
(pin 5)
Norm
a
l
Ω
O
u
tp
u
t
