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NI VirtualBench Calibration Procedure
Figure 1.
Cable Connections for DC Voltage
3.
Wait 2 minutes for the thermal EMF to stabilize.
4.
Null the points by completing the following steps:
a.
For the 100 mV range, set the calibrator to 0 V.
Note
When outputting less than 220 mV, range lock the calibrator to 2.2 V so it
prevents creating a voltage divider with the internal resistance of the VirtualBench.
b.
Call
DMM Configure Measurement
with the following parameters:
•
Function
=
DC Volts
•
Auto Range
=
FALSE
•
Manual Range
=
0.1
c.
Set the input resistance of the VirtualBench to 10 GΩ by calling
DMM Configure
DC Voltage
with the following parameter:
•
Input Resistance
=
10 GOhm
d.
Call
DMM Read
. Record this measurement.
5.
Generate 0.101 V verification point on the calibrator.
6.
Call
DMM Configure Measurement
with the following parameters:
•
Function
=
DC Volts
•
Auto Range
=
FALSE
•
Manual Range
=
0.1
7.
Set the input resistance of the VirtualBench to 10 GΩ by calling
DMM Configure DC
Voltage
with the following parameter:
•
Input Resistance
=
10 GOhm
1
VirtualBench DMM
2
Multifunction Calibrator
3
Low EMF Copper Cable
HI
LO
HI
LO
HVI
S
EN
S
E
V
Ω
OUTPUT
V
Ω
A
AUX
CURRENT
GUARD
GROUND
3
1
2