22
|
ni.com
|
NI 9219 Calibration Procedure
Table 25.
NI 9219 Verification Test Limits for 3-Wire RTD Accuracy
Note
The test limits listed in Table 25 are derived using the values in Table 53.
10. Disconnect the resistor from the device.
11. Repeat steps 1 through 10 for all test points on the NI 9219.
12. Repeat steps 1 through 11 for all channels on the NI 9219.
Half-Bridge Accuracy Verification
Complete the following steps to verify the half-bridge accuracy of an NI 9219.
1.
Connect the NI 9219 to DMM1 as shown in Figure 10.
Figure 10.
Half-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 26.
Mode
Range
Test Point
1
–
Year Limits
Min
(
Ω
)
Max
(
Ω
)
Location
Value
Lower Limit
(
Ω
)
Upper Limit
(
Ω
)
3-Wire
RTD
Pt1000
0
5050
Max
4020
Ω
±1%
–3.86
3.86
Min
20
Ω
±5%
–0.62
0.62
3-Wire
RTD
Pt100
0
505
Max
402
Ω
±1%
–0.80
0.80
Min
4.99
Ω
±5%
–0.48
0.48
NI 9219
HI
V
LO
DMM1
EX+ (3)
HI (4)
EX– (5)
Ch
x