NI 9219 Calibration Procedure
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© National Instruments Corporation
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29
Figure 16.
Full-Bridge Accuracy Verification Connections to the NI 9219 (Configuration 3)
7.
Acquire and average samples.
a.
Configure DMM1 for a voltage measurement in the 10 V range.
b.
Enable Auto Zero on DMM1.
c.
Configure DMM2 for a voltage measurement in the 1 V range.
d.
Enable Auto Zero on DMM2.
e.
Create an AI bridge (V/V) task on the NI 9219 to Table 33.
f.
Configure the AI bridge (V/V) task timing according to Table 34.
g.
Start the task.
Table 33.
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 34.
NI 9219 Timing Configuration
ADC Timing Mode
Sample Timing Type
High Resolution
On Demand
HI
V
LO
DMM2
HI
V
LO
DMM1
V+
V–
S
ource
10 k
Ω
± 1%
10 k
Ω
± 1%
NI 9219
EX+ (3)
HI (4)
LO (6)
EX– (5)
Ch
x
R
TestPoint