14
|
ni.com
|
NI 9218 Calibration Procedure
Bridge Accuracy Verification, 22 mV/V mode
Complete the following steps to verify the full-bridge accuracy of an NI 9218.
1.
Connect a resistor network to the NI 9218 and two DMMs as shown in Figures 6, 7, or 8
for the appropriate test point value indicated in Table 17. Observe the following conditions
when connecting the equipment to the NI 9218.
•
Connect the leads of DMM2 as close as possible to the AI+ and AI- terminals on the
NI 9982.
•
Connect the leads of DMM1 as close as possible to the RS+ and RS- leads of the
NI 9982.
Figure 6.
Bridge Accuracy Verification Connections (Configuration 1)
Figure 7.
Bridge Accuracy Verification Connections (Configuration 2)
10 k
˖
249
˖
10 k
˖
V
a
V
b
DMM 1
R
S
+
R
S
–
EX+
EX–
AI+
NI 99
8
2
AI–
HI
LO
DMM 2
HI
LO
NI 921
8
D
S
UB/LEMO
CH
x
10 k
˖
249
˖
10 k
˖
V
a
V
b
DMM 1
R
S
+
R
S
–
EX+
EX–
AI+
NI 99
8
2
AI–
HI
LO
DMM 2
HI
LO
NI 921
8
D
S
UB/LEMO
CH
x
