NI 9219 Calibration Procedure
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© National Instruments Corporation
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27
Full-Bridge Accuracy Verification
Complete the following steps to verify the full-bridge accuracy of an NI 9219.
1.
Connect the NI 9219 to DMM1 as shown in Figure 14.
Figure 14.
Full-Bridge Accuracy Verification Connections to the NI 9219 (Configuration 1)
2.
Configure DMM1 for a voltage measurement in the 10 V range.
3.
Enable Auto Zero on DMM1.
4.
Acquire a V
ExcitationModule
measurement.
a.
Create an AI bridge (V/V) task on the NI 9219 to Table 31.
b.
Configure the AI bridge (V/V) task timing according to Table 32.
c.
Start the task.
d.
Use DMM1 to measure the excitation voltage from the NI 9219.
e.
Record this measurement as V
ExcitationModule
.
Table 31.
NI 9219 Configuration for Full-Bridge Accuracy Verification
Measurement
Type
Min (V)
Max (V)
Excitation
Source
Excitation
Value
Bridge
Config
Full-Bridge
62.5 mV/V
–0.0625
0.0625
Internal
2.5
Full-Bridge
Full-Bridge
7.8 mV/V
–0.0078125
0.0078125
Table 32.
NI 9219 Timing Configuration
ADC Timing Mode
Sample Timing Type
High Resolution
On Demand
NI 9219
HI
V
LO
DMM1
EX+ (3)
HI (4)
LO (6)
EX– (5)
Ch
x