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NI 9219 Calibration Procedure
Note
The excitation voltage on the NI 9219 may be off if the module is not
configured correctly. The excitation value on the NI 9219 should be at least 2.5 V.
f.
Clear the task.
5.
Set the voltage source to V
ExcitationModule
. Use the smallest available range needed to source
V
ExcitationModule
. Using a range larger than necessary creates unwanted additional noise.
6.
Connect the NI 9219 to DMM1, DMM2, and the source as shown in Figures 15 or 16 for
the appropriate test point value indicated in Table . Observe the following conditions when
connecting the equipment to the NI 9219.
•
Connect the leads of DMM1 as close as possible to the terminals on the NI 9219.
•
Connect the HI lead of DMM2 as close as possible to the same point that the HI lead
of the NI 9219 connects to the resistor network.
•
Connect the LO lead of DMM2 as close as possible to the same point that the LO lead
of the NI 9219 connects to the resistor network.
Figure 15.
Full-Bridge Accuracy Verification Connections to the NI 9219 (Configuration 2)
HI
LO
DMM2
HI
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