NI VirtualBench Calibration Procedure
|
© National Instruments
|
13
10. Call
DMM Read
20 times. Calculate and record the average value. Subtract the average
value measured in step 7. Verify that the result falls between the limits listed in Table 6.
Note
Use the values in the
24 Hour Limits
column for a post-adjustment
verification
only.
Otherwise, use the values in the
1 Year Limits
column.
Note
Limits are provided for resistance instead of absolute limits because the limits
depend on the actual resistance value output by your calibrator.
11. Repeat steps 8 through 10 for each verification point of the 100 Ω range listed in Table 6.
12. Repeat steps 3 through 11 for every range in Table 6.
13. To verify resistance >19 kΩ, call
DMM Configure Measurement
with the following
parameters:
•
Function
=
Resistance
•
Auto Range
=
FALSE
•
Manual Range
=
100 k
Ω
14. Set the calibrator to output 0 Ω with 2-wire compensation turned off.
15. Call
DMM Read
to allow the calibrator to properly settle.
16. Wait 5 seconds for settling.
17. Call
DMM Read
20 times. Calculate and record the average value.
Table 6.
VirtualBench Resistance
≤
19 k
Ω
Verification Limits
Range
Verification Point
1 Year Limits ±
(% of Calibrator
% of
Range)
24 Hour Limits ±
(Deviation from
Calibrator Output)
100 Ω
1 Ω
0.018 + 0.05
48.7 mΩ
100 Ω
0.018 + 0.05
49.3 mΩ
1 kΩ
10 Ω
0.018 + 0.005
48.0 mΩ
190 Ω
0.018 + 0.005
70.0 mΩ
1 kΩ
0.018 + 0.005
67.0 mΩ
10 kΩ
100 Ω
0.018 + 0.005
130 mΩ
1.9 kΩ
0.018 + 0.005
310 mΩ
10 kΩ
0.018 + 0.005
350 mΩ
100 kΩ
1 kΩ
0.018 + 0.005
1.1 Ω
19 kΩ
0.018 + 0.005
2.0 Ω
1 MΩ
10 kΩ
0.035 + 0.005
28 Ω