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NI VirtualBench Calibration Procedure
|
© National Instruments
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15
Verifying DC Current
To verify the DC current function of the VirtualBench, complete the following steps:
1.
Reset the calibrator.
2.
To verify DC current ranges <1 A, connect the connectors on one end of the low EMF
copper cable to the VirtualBench mA and LO banana plug connectors, and connect the
connectors on the other end of the cable to the HI and LO calibrator binding posts. Figure 4
shows the correct connections.
Figure 4.
Cable Connections for Current Ranges <1 A
3.
Wait 2 minutes for the thermal EMF to stabilize.
4.
Generate 0.0101 A verification point on the calibrator.
5.
Call
DMM Configure Measurement
with the following parameters:
•
Function
=
DC Current
•
Auto Range
=
FALSE
•
Manual Range
=
0.01
6.
Call
DMM Read
. Compare to the limits listed in Table 8.
1
VirtualBench DMM
2
Multifunction Calibrator
3
Low EMF Copper Cable
Table 8.
VirtualBench DC Current Verification Limits <1 A
Range
(A)
Verification
Point (A)
1 Year Limits (A)
24 Hour Limits (A)
Lower
Upper
Lower
Upper
0.01
0.0101
0.0100909
0.0101091
0.0100976
0.0101024
0
-0.0000020
0.0000020
-0.0000020
0.0000020
-0.0101
-0.0101091
-0.0100909
-0.0101024
-0.0100976
0.1
0.101
0.100926
0.101074
0.100995
0.101005
0
-0.000003
0.000003
-0.000003
0.000003
-0.101
-0.101074
-0.100926
-0.101005
-0.100995
HI
LO
HI
LO
HVI
S
EN
S
E
V
Ω
OUTPUT
V
Ω
A
AUX
CURRENT
GUARD
GROUND
1
2
3