NI VirtualBench Calibration Procedure
CALIBRATION PROCEDURE
NI VirtualBench™
VB-8012, VB-8034, and VB-8054 All-In-One Instrument
This document contains the verification and adjustment procedures for the National Instruments
VirtualBench VB-8012, VB-8034, and VB-8054. For more information about calibration
solutions, visit ni.com/calibration.
Contents
Software and Firmware ...........................................................................................................1
Documentation.........................................................................................................................2
Test Equipment........................................................................................................................2
Test Conditions........................................................................................................................4
Digital Multimeter (DMM) Calibration Procedure .................................................................4
DMM Test Equipment.....................................................................................................5
DMM Test Conditions.....................................................................................................5
DMM Initial Setup...........................................................................................................6
DMM Verification...........................................................................................................6
Verifying DC Voltage .............................................................................................6
Verifying AC Voltage .............................................................................................9
Verifying Resistance................................................................................................11
Verifying DC Current..............................................................................................14
Verifying AC Current..............................................................................................17
DMM Adjustment............................................................................................................19
Setting Up the Test Equipment................................................................................20
Adjusting DC Voltage .............................................................................................20
Adjusting AC Voltage .............................................................................................21
Adjusting Resistance ...............................................................................................22
Adjusting AC and DC Current ................................................................................24
DMM EEPROM Update .................................................................................................25
DMM Re-Verification .....................................................................................................26
Oscilloscope Calibration Procedure ........................................................................................26
Oscilloscope Test Equipment ..........................................................................................26
Oscilloscope Test Conditions ..........................................................................................27
Oscilloscope Initial Setup................................................................................................27
Oscilloscope Verification ................................................................................................28
Verifying the Oscilloscope Offset ...........................................................................28
Verifying the Oscilloscope Gain .............................................................................31
Verifying the Oscilloscope Offset DAC Gain .........................................................36
Oscilloscope Adjustment.................................................................................................42
Oscilloscope EEPROM Update.......................................................................................46
Oscilloscope Re-Verification ..........................................................................................46
Function Generator (FGEN) Calibration Procedure ............................................................... 46
FGEN Test Equipment.................................................................................................... 47
FGEN Test Conditions.................................................................................................... 47
FGEN Initial Setup ......................................................................................................... 48
FGEN Verification.......................................................................................................... 48
Verifying the FGEN Offset..................................................................................... 48
Verifying the FGEN Gain....................................................................................... 49
FGEN Adjustment .......................................................................................................... 50
FGEN EEPROM Update ................................................................................................ 52
FGEN Re-Verification .................................................................................................... 52
DC Power Supply Calibration Procedure ............................................................................... 52
DC Power Supply Test Equipment ................................................................................. 53
DC Power Supply Test Conditions ................................................................................. 53
DC Power Supply Initial Setup....................................................................................... 54
DC Power Supply Verification ....................................................................................... 54
Verifying Voltage Programming and Measurement Accuracy .............................. 55
Verifying Current Programming and Measurement Accuracy............................... 60
DC Power Supply Adjustment........................................................................................ 64
Adjusting Voltage Programming and Measurement Accuracy .............................. 64
Adjusting Current Programming and Measurement Accuracy............................... 68
DC Power Supply EEPROM Update.............................................................................. 72
DC Power Supply Re-Verification ................................................................................. 72
Where to Go for Support ........................................................................................................ 72
Software and Firmware
Calibrating the NI VirtualBench requires the installation of NI VirtualBench application
development support and NI LabVIEW 2013 or later on the Windows calibration system. You
can download the software and driver from ni.com/downloads.
Table 1 lists the earliest required firmware support for VirtualBench calibration. You can update
the firmware through the VirtualBench application.
Table 1. VirtualBench Calibration Firmware Support
VirtualBench
2
Earliest Firmware Support
VB-8012
Version 1.1.2
VB-8034
Version 15.1
VB-8054
Version 16.1
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NI VirtualBench Calibration Procedure
Documentation
Consult the following documents for information about the NI VirtualBench and your application
software. All documents are available on ni.com and help files install with the software.
NI VirtualBench VB-8012 Quick Start or
NI VirtualBench VB-8034/8054 Quick Start
Contains: NI VirtualBench hardware installation, software launching
NI VirtualBench VB-8012 Specifications, NI VirtualBench VB-8034
Specifications, or NI VirtualBench VB-8054 Specifications
Contains: specifications and calibration interval for your VirtualBench
NI VirtualBench VI Reference Help
Contains: LabVIEW programming concepts and reference information about
NI VirtualBench VIs and functions
Test Equipment
Table 2 lists all recommended equipment for the performance verification and adjustment
procedures for all VirtualBench instruments. If the recommended equipment is not available,
select a substitute using the requirements listed in the table.
Table 2. VirtualBench Calibration Recommended Equipment
Recommended
Model
Instrument
Calibration
Minimum
Requirements
Multifunction
calibrator
Fluke
5700A/5720A/5730A
Digital Multimeter
(DMM) Calibration
Procedure
Must be calibrated
within the last year.
Low thermal
electromotive
force (EMF)
copper cable
Fluke 5440A-7002
Digital Multimeter
(DMM) Calibration
Procedure
Low thermal
electromotive force
(EMF) copper cable
with 4 mm banana
connectors.
Amplifier
Fluke 5725A
Digital Multimeter
(DMM) Calibration
Procedure
Must be calibrated
within the last year.
Shielded interface
cable for the
amplifier
Fluke 842901
Digital Multimeter
(DMM) Calibration
Procedure
—
Equipment
NI VirtualBench Calibration Procedure
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Table 2. VirtualBench Calibration Recommended Equipment (Continued)
Equipment
Instrument
Calibration
Minimum
Requirements
50 Ω terminator
Amphenol
000-46650-51RFX
Oscilloscope
Calibration
Procedure
VB-8012 only.
Oscilloscope
calibrator
Fluke 9500B
calibrator
Oscilloscope
Calibration
Procedure
Vertical gain:
DC ±(0.025% +
25 μV) into 1 MΩ
Oscilloscope
calibrator active
head
Fluke 9530
Oscilloscope
Calibration
Procedure
DC operation
Function generator
NI 5421
Oscilloscope
Calibration
Procedure
(adjustment section)
Must be able to
generate a 1 kHz
square wave
between 36 mVpp
and 18 Vpp with less
than 200 ns rise time
and less than 5%
overshoot.
SMB to BNC cable
NI part number
778827-01
Oscilloscope
Calibration
Procedure
Cable needed to
connect from the
function generator
to the VirtualBench
BNC connectors.
Digital multimeter
(DMM)
NI PXI-4071
Function Generator
(FGEN) Calibration
Procedure,
DC Power Supply
Calibration
Procedure
DC V accuracy:
21 ppm at 25 V
DC input
impedance: ≥1 GΩ
DC A accuracy:
310 ppm at 1 A,
460 ppm at 2 A
Banana
plug-to-BNC cable
Pomona 4530-C
Function Generator
(FGEN) Calibration
Procedure
—
Cabling wire
4
Recommended
Model
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NI VirtualBench Calibration Procedure
DC Power Supply
Calibration
Procedure
18 AWG to
22 AWG. Twisted
pair, shielded
cabling wire is
recommended
Test Conditions
Follow these guidelines to optimize the equipment and the environment during calibration:
•
Keep connections to the device as short as possible. Long cables and wires act as antennae,
picking up noise that can affect measurements.
•
Use a USB connection between the PC and VirtualBench.
•
Verify that all connections to the device, including front panel connections, are secure.
•
Keep relative humidity between 10% and 80% noncondensing.
•
Allow a warm up time of at least 30 minutes to ensure that the VirtualBench is at a stable
operating temperature.
•
Plug the VirtualBench, PC, and the test equipment into the same power strip to avoid
ground loops.
•
Verification limits are defined assuming the same test equipment is used during verification
and adjustment.
•
(Oscilloscope, FGEN, and DC Power Supply Procedures) Maintain an ambient
temperature of 23 ±5 °C. The device temperature will be greater than the ambient
temperature.
•
(DMM Procedure) Maintain an ambient temperature of 23 ±1 °C. The device temperature
•
(DMM Procedure) Clean any oxidation from the banana plugs on the Fluke 5440 cables
will be greater than the ambient temperature.
before plugging them into the binding posts of the calibrator or the banana plug connectors
on the VirtualBench. Oxidation tarnishes the copper banana plugs so that they appear dull
rather than shiny and leads to greater thermal EMF.
•
(DMM Procedure) Keep the blue banana plugs on the Fluke 5440 cables connected to the
V GUARD binding post of the calibrator at all times.
•
(DMM Procedure) Prevent the cables from moving or vibrating by taping or strapping
them to a nonvibrating surface. Movement or vibration causes triboelectric effects that can
result in measurement errors.
•
(DC Power Supply Procedure) Use shielded copper wire for all cable connections. Use
twisted-pair, shielded wire to reduce measurement error in noisy environments.
Digital Multimeter (DMM) Calibration Procedure
This section contains the verification and adjustment procedures for the DMM on the
VirtualBench. The calibration process includes the following steps:
1.
DMM Initial Setup—Set up the test equipment.
2.
DMM Verification—Verify the existing operation of the instrument. This step confirms
whether the instrument is operating within its specified range prior to adjustment.
3.
DMM Adjustment—Perform an external adjustment of the instrument that adjusts the
calibration constants with respect to standards of known values.
4.
DMM Re-Verification—Repeat the verification procedure to ensure that the instrument is
operating within its specifications after adjustment.
NI VirtualBench Calibration Procedure
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These steps are described in more detail in the following sections.
If you are calibrating both the DMM and the DC power supply, the DMM
must be calibrated first.
Note
DMM Test Equipment
Table 3 lists the equipment recommended for the DMM performance verification and
adjustment procedures. If the recommended equipment is not available, select a substitute using
the requirements listed in the table.
Table 3. Recommended Equipment
Equipment
Recommended
Model
Minimum Requirements
Multifunction
calibrator
Fluke 5700A/
5720A/5730A
Must be calibrated within the last year.
Low thermal
electromotive
force (EMF)
copper cable
Fluke 5440A-7002
Low thermal electromotive force (EMF)
copper cable with 4 mm banana
connectors.
Amplifier
Fluke 5725A
Must be calibrated within the last year.
Shielded interface
cable for the
amplifier
Fluke 842901
—
DMM Test Conditions
Follow these guidelines to optimize the equipment and the environment during calibration:
•
Keep connections to the device as short as possible. Long cables and wires act as antennae,
picking up noise that can affect measurements.
•
Use a USB connection between the PC and VirtualBench.
•
Verify that all connections to the device, including front panel connections, are secure.
•
Keep relative humidity between 10% and 80% noncondensing.
•
Allow a warm up time of at least 30 minutes to ensure that the VirtualBench is at a stable
operating temperature.
•
Plug the VirtualBench, PC, and the test equipment into the same power strip to avoid
ground loops.
•
Verification limits are defined assuming the same test equipment is used during verification
and adjustment.
•
Maintain an ambient temperature of 23 ±1 °C. The device temperature will be greater than
the ambient temperature.
6
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NI VirtualBench Calibration Procedure
•
Clean any oxidation from the banana plugs on the Fluke 5440 cables before plugging them
into the binding posts of the calibrator or the banana plug connectors on the VirtualBench.
Oxidation tarnishes the copper banana plugs so that they appear dull rather than shiny and
leads to greater thermal EMF.
•
Keep the blue banana plugs on the Fluke 5440 cables connected to the V GUARD binding
post of the calibrator at all times.
•
Prevent the cables from moving or vibrating by taping or strapping them to a nonvibrating
surface. Movement or vibration causes triboelectric effects that can result in measurement
errors.
DMM Initial Setup
This section is necessary for pre-adjustment verifications only. If you are
performing a post-adjustment verification, skip the setup and go directly to the DMM
Verification section.
Note
To set up the test equipment, complete the following steps:
1.
If VirtualBench is running, shut down all instruments on the VirtualBench, and close the
VirtualBench software. Remove all signal connections.
2.
Verify that the calibrator has been calibrated within the time limits specified in the DMM
Test Equipment section, and that DC zeros calibration has been performed within the last
30 days. Consult the Fluke user documentation for instructions on calibrating these devices.
Note
3.
Ensure that the VirtualBench is warmed up for at least 30 minutes.
Call DMM Initialize to create a session. For more information on using DMM
Initialize, refer to the NI VirtualBench VI Reference Help.
Note You use this session in all subsequent function calls throughout the
verification procedures.
DMM Verification
You can use the verification procedures described in this section for both pre-adjustment and
post-adjustment verification. The steps of each verification procedure must be performed in the
order listed; however, you can omit entire sections (for example, the entire Verifying AC Current
section), if necessary.
Verifying DC Voltage
To verify the DC voltage function of the VirtualBench DMM, complete the following steps:
1.
Reset the calibrator.
2.
Connect the red connectors on one end of the low thermal electromotive force (EMF)
copper cable to the banana plug connectors of the VirtualBench, and connect the connectors
on the other end of the cable to the appropriate calibrator binding posts. Figure 1 shows the
correct connections.
NI VirtualBench Calibration Procedure
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Figure 1. Cable Connections for DC Voltage
1
2
3
OUTPUT
VΩA
SENSE
VΩ
HI
HI
LO
LO
HVI
AUX
CURRENT
1
VirtualBench DMM
3.
2
Multifunction Calibrator
3
GUARD
GROUND
Low EMF Copper Cable
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.
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.
Note
b.
c.
Call DMM Configure Measurement with the following parameters:
•
Function = DC Volts
•
Auto Range = FALSE
•
Manual Range = 0.1
Set the input resistance of the VirtualBench to 10 GΩ by calling DMM Configure
DC Voltage with the following parameter:
•
d.
Input Resistance = 10 GOhm
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:
7.
•
Function = DC Volts
•
Auto Range = FALSE
•
Manual Range = 0.1
Set the input resistance of the VirtualBench to 10 GΩ by calling DMM Configure DC
Voltage with the following parameter:
•
8
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Input Resistance = 10 GOhm
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NI VirtualBench Calibration Procedure
8.
Call DMM Read. Subtract the saved value from step 4 and compare to the limits listed in
Table 4.
Table 4. VirtualBench DC Voltage Verification Limits
1 Year Limits (V)
24 Hour Limits (V)
Range
(V)
Verification
Point (V)
Input
Resistance
Lower
Upper
Lower
Upper
0.1
0.101
10 GΩ
0.100980
0.101020
0.100996
0.101004
0
-0.000005
0.000005
-0.000003
0.000003
-0.101
-0.101020
-0.100980
-0.101004
-0.100996
1.009800
1.010200
1.009960
1.010040
0
-0.00005
0.00005
-0.00002
0.00002
-1.01
-1.010200
-1.009800
-1.010040
-1.009960
10.0980
10.1020
10.0997
10.1003
0
-0.0005
0.0005
-0.0002
0.0002
-10.1
-10.1020
-10.0980
-10.1003
-10.0997
100.960
101.040
100.993
101.007
0
-0.005
0.005
-0.002
0.002
-101
-101.040
-100.960
-101.007
-100.993
149.933
150.068
149.979
150.021
0
-0.015
0.015
-0.014
0.014
-150
-150.068
-149.933
-150.021
-149.979
1
10
100
300
1.01
10.1
101
150
10 GΩ
10 GΩ
10 MΩ
10 MΩ
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.
9.
Repeat steps 5 through 8 for each verification point listed for the 100 mV range in Table 4.
10. Generate 1.01 V verification point on the calibrator.
11. Call DMM Configure Measurement with the following parameters:
•
Function = DC Volts
•
Auto Range = FALSE
•
Manual Range = 1
12. Set the input resistance of the VirtualBench by calling DMM Configure DC Voltage
with the following parameter:
•
Input Resistance = 10 GOhm
13. Call DMM Read. Compare to the limits listed in Table 4.
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14. Repeat steps 10 through 13 for each verification point in the remaining ranges listed in
Table 4.
15. Reset the calibrator for safety reasons.
16. Disconnect all cables from the calibrator and VirtualBench.
You have completed verifying the DC voltage function of the VirtualBench.
Verifying AC Voltage
To verify the AC voltage function of the VirtualBench DMM, complete the following steps:
1.
Reset the calibrator.
2.
Connect the red connectors on one end of the low EMF copper cable to the banana plug
connectors of the VirtualBench, and connect the connectors on the other end of the cable to
the appropriate calibrator binding posts. Figure 2 shows the correct connections.
Figure 2. Cable Connections for AC Voltage
1
2
3
OUTPUT
VΩA
SENSE
VΩ
HI
HI
LO
LO
HVI
AUX
CURRENT
1
3.
VirtualBench DMM
2
Multifunction Calibrator
3
GUARD
GROUND
Low EMF Copper Cable
Wait 2 minutes for the thermal EMF to stabilize.
Thermal EMF stabilization time is not needed if the cables have not been
connected/reconnected.
Note
4.
Generate 0.006 Vrms verification point on the calibrator.
5.
Call DMM Configure Measurement with the following parameters:
10
•
Function = AC Volts
•
Auto Range = FALSE
•
Manual Range = 0.1
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NI VirtualBench Calibration Procedure
6.
Call DMM Read. Compare to the limits listed in Table 5.
Table 5. VirtualBench AC Voltage Verification Limits
Range
(Vrms)
Verification
Point
Frequency
(kHz)
Verification
Point (Vrms)
Lower
Upper
Lower
Upper
0.1
1
0.006
0.005943
0.006057
0.005988
0.006012
0.05
0.049890
0.050110
0.049984
0.050016
0.101
0.100829
0.101171
0.100979
0.101021
0.06
0.05943
0.06057
0.05988
0.06012
0.5
0.49890
0.50110
0.49984
0.50016
1.01
1.00829
1.01171
1.00979
1.01021
0.6
0.5943
0.6057
0.5988
0.6012
5
4.9890
5.0110
4.9984
5.0016
10.1
10.0829
10.1171
10.0979
10.1021
6
5.943
6.057
5.988
6.012
50
49.890
50.110
49.984
50.016
101
100.829
101.171
100.979
101.021
15.9
15.748
16.052
15.868
15.932
66.25
66.038
66.462
66.213
66.287
135.15
134.855
135.445
135.107
135.193
1
10
100
265
1
1
1
1
1 Year Limits (Vrms)
24 Hour Limits (Vrms)
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.
7.
Repeat steps 4 through 6 for each verification point listed in Table 5 for all ranges.
8.
Reset the calibrator for safety reasons.
9.
Disconnect all cables from the calibrator and VirtualBench.
You have completed verifying the AC voltage function of the VirtualBench.
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Verifying Resistance
To verify the resistance function of the VirtualBench, complete the following steps:
1.
To verify resistance ≤19 kΩ, connect the red connectors on one end of the low EMF copper
cable to the banana plug connectors of the VirtualBench, and connect the connectors on the
other end of the cable to the appropriate calibrator binding posts. Figure 3 shows the correct
connections.
Figure 3. Cable Connections for Resistance ≤19 kΩ
1
2
3
OUTPUT
VΩA
SENSE
VΩ
HI
HI
LO
LO
HVI
AUX
CURRENT
1
2.
VirtualBench DMM
2
Multifunction Calibrator
3
GUARD
GROUND
Low EMF Copper Cable
Wait 2 minutes for the thermal EMF to stabilize.
Thermal EMF stabilization time is not needed if the cables have not been
connected/reconnected.
Note
3.
Call DMM Configure Measurement with the following parameters:
•
Function = Resistance
•
Auto Range = FALSE
•
Manual Range = 100
4.
Set the calibrator to output 0 Ω with 2-wire compensation turned on.
5.
Call DMM Read to allow the calibrator to properly settle.
6.
Wait 5 seconds for settling.
7.
Call DMM Read 20 times. Calculate and record the average value.
8.
Output 1 Ω verification point on the calibrator.
9.
Call DMM Configure Measurement with the following parameters:
12
•
Function = Resistance
•
Auto Range = FALSE
•
Manual Range = 100
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NI VirtualBench Calibration Procedure
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.
Table 6. VirtualBench Resistance ≤19 kΩ Verification Limits
Range
Verification Point
1 Year Limits ±
(% of Calibrator
Output + % of
Range)
100 Ω
1Ω
0.018 + 0.05
48.7 mΩ
100 Ω
0.018 + 0.05
49.3 mΩ
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
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
1 kΩ
0.018 + 0.005
1.1 Ω
19 kΩ
0.018 + 0.005
2.0 Ω
10 kΩ
0.035 + 0.005
28 Ω
1 kΩ
10 kΩ
100 kΩ
1 MΩ
24 Hour Limits ±
(Deviation from
Calibrator Output)
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.
Limits are provided for resistance instead of absolute limits because the limits
depend on the actual resistance value output by your calibrator.
Note
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 kΩ
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.
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18. Output 100 kΩ verification point on the calibrator.
19. Call DMM Configure Measurement with the following parameters:
•
Function = Resistance
•
Auto Range = FALSE
•
Manual Range = 100 kΩ
20. Call DMM Read 20 times. Calculate and record the average value. Subtract the average
value measured in step 17. Verify that the result falls between the limits listed in Table 7.
Table 7. VirtualBench Resistance >19 kΩ Verification Limits
Range
Verification Point
1 Year Limits ±
(% of Calibrator
Output + % of
Range)
100 kΩ
100 kΩ
0.018 + 0.005
3.8 Ω
1 MΩ
1 MΩ
0.035 + 0.005
100 Ω
10 MΩ
100 kΩ
0.150 + 0.005
120 Ω
10 MΩ
0.150 + 0.005
10 kΩ
1 MΩ
1.3 + 0.005
1.5 kΩ
100 MΩ
1.3 + 0.005
190.3 kΩ
100 MΩ
24 Hour Limits ±
(Deviation from
Calibrator Output)
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.
Limits are provided for resistance instead of absolute limits because the limits
depend on the actual resistance value output by your calibrator.
Note
21. Repeat steps 18 through 20 for each verification point on that range listed in Table 7.
22. Repeat steps 13 through 21 for each range listed in Table 7.
23. Reset the calibrator for safety reasons.
24. Disconnect all cables from the calibrator and VirtualBench.
You have completed verifying the resistance function of the VirtualBench.
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NI VirtualBench Calibration Procedure
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
1
2
3
OUTPUT
VΩA
SENSE
VΩ
HI
HI
LO
LO
HVI
AUX
CURRENT
1
VirtualBench DMM
2
Multifunction Calibrator
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:
6.
•
Function = DC Current
Auto Range = FALSE
•
Manual Range = 0.01
GROUND
Low EMF Copper Cable
3.
•
GUARD
Call DMM Read. Compare to the limits listed in Table 8.
Table 8. VirtualBench DC Current Verification Limits <1 A
1 Year Limits (A)
24 Hour Limits (A)
Range
(A)
Verification
Point (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
0.101
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
0.1
NI VirtualBench Calibration Procedure
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15
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.
7.
Repeat steps 4 through 6 for each verification point listed in Table 8.
8.
Reset the calibrator for safety reasons.
9.
Disconnect all cables from the calibrator and VirtualBench.
Consult the user documentation for the amplifier used in step 10 for the
recommended warm up time (at least 30 minutes) to ensure that the amplifier
circuitry is at a stable operating temperature.
Note
10. To verify DC current ranges ≥1 A, connect an amplifier to the calibrator, connect the
connectors on one end of the low EMF copper cable to the VirtualBench A and LO banana
plug connectors, and connect the connectors on the other end of the cable to the HI and LO
binding posts on the amplifier. Figure 5 shows the correct connections.
Figure 5. Cable Connections for DC Current Ranges ≥1 A
4
HI
LO
1
5
3
OUTPUT
VΩA
SENSE
VΩ
HI
HI
LO
LO
HVI
2
1
2
3
VirtualBench DMM
Multifunction Calibrator
Low EMF Copper Cable
4
5
Amplifier
Shielded Interface Cable
11. Wait 2 minutes for the thermal EMF to stabilize.
12. Generate 1.01 A verification point on the calibrator.
13. Call DMM Configure Measurement with the following parameters:
16
•
Function = DC Current
•
Auto Range = FALSE
•
Manual Range = 1
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NI VirtualBench Calibration Procedure
AUX
CURRENT
GUARD
GROUND
14. Call DMM Read. Compare to the limits listed in Table 9.
Table 9. VirtualBench DC Current Verification Limits ≥1 A
1 Year Limits (A)
24 Hour Limits (A)
Range
(A)
Verification
Point (A)
Lower
Upper
Lower
Upper
1
1.01
1.00844
1.01156
1.00968
1.01032
0
-0.00025
0.00025
-0.00025
0.00025
-1.01
-1.01156
-1.00844
-1.01032
-1.00968
2.2
2.1967
2.2033
2.1995
2.2005
0
-0.0004
0.0004
-0.0004
0.0004
-2.2
-2.2033
-2.1967
-2.2005
-2.1995
10
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.
15. Repeat steps 12 through 14 for each verification point listed in Table 9.
16. Reset the calibrator for safety reasons.
17. Disconnect all cables from the calibrator and VirtualBench.
You have completed verifying the DC current function of the VirtualBench.
NI VirtualBench Calibration Procedure
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17
Verifying AC Current
To verify the AC current function of the VirtualBench DMM, complete the following steps:
1.
Reset the calibrator.
2.
To verify AC current ranges ≤50 mA, 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 6
shows the correct connections.
Figure 6. Cable Connections for AC Current Ranges ≤50 mA
1
2
3
OUTPUT
VΩA
SENSE
VΩ
HI
HI
LO
LO
HVI
AUX
CURRENT
1
3.
VirtualBench DMM
2
Multifunction Calibrator
3
GROUND
Low EMF Copper Cable
Wait 2 minutes for the thermal EMF to stabilize.
4.
Generate 0.0003 A verification point on the calibrator.
5.
Call DMM Configure Measurement with the following parameters:
6.
GUARD
•
Function = AC Current
•
Auto Range = FALSE
•
Manual Range = 0.005
Call DMM Read. Compare to the limits listed in Table 10.
Table 10. VirtualBench AC Current Verification Limits ≤50 mA
Range
(Arms)
Verification
Point (Arms)
Frequency
(Hz)
1 Year Limits (Arms)
24 Hour Limits (Arms)
Lower
Upper
Lower
Upper
0.005
0.0003
40
0.0002969
0.0003031
0.0002995
0.0003005
0.0025
40
0.0024925
0.0025075
0.0024989
0.0025011
0.00505
40
0.0050374
0.0050626
0.0050481
0.0050519
0.003
40
0.002969
0.003031
0.002995
0.003005
0.025
40
0.024925
0.025075
0.024988
0.025012
0.0505
40
0.050374
0.050626
0.050480
0.050520
0.05
18
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NI VirtualBench Calibration Procedure
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.
7.
Repeat steps 4 through 6 for each verification point listed in Table 10.
8.
Reset the calibrator for safety reasons.
9.
Disconnect all cables from the calibrator and VirtualBench.
Consult the user documentation for the amplifier used in step 10 for the
recommended warm up time (at least 30 minutes) to ensure that the amplifier
circuitry is at a stable operating temperature.
Note
10. To verify AC current ranges ≥500 mA, connect an amplifier to the calibrator, connect the
connectors on one end of the low EMF copper cable to the VirtualBench A and LO banana
plug connectors, and connect the connectors on the other end of the cable to the HI and LO
binding posts on the amplifier. Figure 7 shows the correct connections.
Figure 7. Cable Connections for AC Current Ranges ≥500 mA
4
HI
LO
1
5
3
OUTPUT
VΩA
SENSE
VΩ
HI
HI
LO
LO
HVI
2
1
2
3
VirtualBench DMM
Multifunction Calibrator
Low EMF Copper Cable
4
5
AUX
CURRENT
GUARD
GROUND
Amplifier
Shielded Interface Cable
11. Wait 2 minutes for the thermal EMF to stabilize.
12. Generate 30 mA verification point on the calibrator.
13. Call DMM Configure Measurement with the following parameters:
•
Function = AC Current
•
Auto Range = FALSE
•
Manual Range = 0.5
NI VirtualBench Calibration Procedure
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19
14. Call DMM Read. Compare to the limits listed in Table 11.
Table 11. VirtualBench AC Current Verification Limits ≥500 mA
Range
(Arms)
Verification
Point (Arms)
Frequency
(Hz)
1 Year Limits (Arms)
24 Hour Limits (Arms)
Lower
Upper
Lower
Upper
0.5
0.03
40
0.02971
0.03030
0.02992
0.03008
0.25
40
0.24938
0.25063
0.24982
0.25018
0.505
40
0.50399
0.50601
0.50471
0.50529
0.3
40
0.2968
0.3033
0.2969
0.3031
2.5
40
2.4913
2.5088
2.4928
2.5072
5.05
40
5.0349
5.0651
5.0380
5.0620
5
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.
15. Repeat steps 12 through 14 for each verification point listed in Table 11.
16. Reset the calibrator for safety reasons.
17. Disconnect all cables from the calibrator and VirtualBench.
You have completed verifying the AC current function of the VirtualBench.
DMM Adjustment
This section explains how to adjust the VirtualBench DMM. You can choose to perform these
adjustment procedures with or without performing the verification procedures first.
If you skip any of the steps within a section of the adjustment procedures,
NI VirtualBench does not allow you to store your new calibration coefficients.
Instead, NI VirtualBench restores the original coefficients to the EEPROM.
Caution
If verification was successful and you do not want to go through the
adjustment procedure, you can update the calibration date by calling Cal Set
Calibration Information.
Note
NI recommends repeating the verification procedures after you perform these
adjustment procedures. Re-verification ensures that the instrument you have
calibrated is operating within specifications after adjustments.
Note
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NI VirtualBench Calibration Procedure
Setting Up the Test Equipment
If you have not already set up the test equipment, complete the following steps:
1.
Remove all connections from the input banana plug connectors on the VirtualBench.
2.
Verify that the calibrator has been calibrated within the time limits specified in Table 3, and
that DC zeros calibration has been performed within the last 30 days. Consult the Fluke user
documentation for instructions on calibrating these devices.
Note Ensure that the calibrator is warmed up for at least 60 minutes before you
begin this procedure.
3.
Reset the calibrator.
4.
If you have not already done so, allow the VirtualBench to warm up for 30 minutes.
Adjusting DC Voltage
To adjust the DC voltage function of the VirtualBench, complete the following steps:
1.
Reset the calibrator.
2.
Connect the red connectors on one end of the low EMF copper cable to the banana plug
connectors of the VirtualBench, and connect the connectors on the other end of the cable to
the appropriate calibrator binding posts. Figure 8 shows the correct connections.
Figure 8. Cable Connections for DC Voltage
1
2
3
OUTPUT
VΩA
SENSE
VΩ
HI
HI
LO
LO
HVI
AUX
CURRENT
1
VirtualBench DMM
2
Multifunction Calibrator
3
Wait 2 minutes for the thermal EMF to stabilize.
4.
Call DMM Initialize Calibration with the following parameter:
•
GROUND
Low EMF Copper Cable
3.
5.
GUARD
Password = NI (default)
Call DMM Get DC Voltage Calibration Adjustment Points. This will return
two arrays:
6.
•
Range—A numerical array specifying the range being calibrated
•
Adjustment Point—A numerical array specifying the DC voltage required to perform
the adjustment
Output the adjustment point on the calibrator.
NI VirtualBench Calibration Procedure
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21
7.
Call DMM Adjust DC Voltage Calibration with the following parameters:
•
Range—Supplied from the output of DMM Get DC Voltage Calibration Adjustment
Points
•
Adjustment Point—Supplied from the output of DMM Get DC Voltage Calibration
Adjustment Points
8.
Repeat steps 6 through 7 for all adjustment points.
9.
Call DMM Close Calibration with the following parameter:
•
Action Input = Commit
10. Reset the calibrator for safety reasons.
11. Disconnect all cables from the calibrator and VirtualBench.
You have completed adjusting the DC voltage function of the VirtualBench.
Adjusting AC Voltage
To adjust the AC voltage function of the VirtualBench, complete the following steps:
1.
Reset the calibrator.
2.
Connect the red connectors on one end of the low EMF copper cable to the banana plug
connectors of the VirtualBench, and connect the connectors on the other end of the cable to
the appropriate calibrator binding posts. Figure 9 shows the correct connections.
Figure 9. Cable Connections for AC Voltage
1
2
3
OUTPUT
VΩA
SENSE
VΩ
HI
HI
LO
LO
HVI
AUX
CURRENT
1
3.
VirtualBench DMM
2
Multifunction Calibrator
3
GUARD
GROUND
Low EMF Copper Cable
Wait 2 minutes for the thermal EMF to stabilize.
Thermal EMF stabilization time is not needed if the cables have not been
connected/reconnected.
Note
4.
Call DMM Initialize Calibration with the following parameter:
•
22
Password = NI (default)
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NI VirtualBench Calibration Procedure
5.
Call DMM Get AC Voltage Calibration Adjustment Points. This will return
three arrays:
6.
7.
•
Range—A numerical array specifying the range being calibrated
•
Adjustment Point—A numerical array specifying the voltage required to perform the
adjustment
•
Frequency—A numerical array specifying the frequency of the calibration signal
Output the adjustment point on the calibrator.
Call DMM Adjust AC Voltage Calibration with the following parameters:
•
Range—Supplied from the output of DMM Get AC Voltage Calibration Adjustment
Points
•
Adjustment Point—Supplied from the output of DMM Get AC Voltage Calibration
Adjustment Points
•
Frequency—Supplied from the output of DMM Get AC Voltage Calibration
Adjustment Points
8.
Repeat steps 6 through 7 for all adjustment points.
9.
Call DMM Close Calibration with the following parameter:
•
Action Input = Commit
10. Reset the calibrator for safety reasons.
11. Disconnect all cables from the calibrator and VirtualBench.
You have completed adjusting the AC voltage function of the VirtualBench.
Adjusting Resistance
To adjust the resistance function of the VirtualBench, complete the following steps:
1.
Reset the calibrator.
2.
To adjust resistance ≤19 kΩ, connect the red connectors on one end of the low EMF copper
cable to the banana plug connectors of the VirtualBench, and connect the connectors on the
other end of the cable to the appropriate calibrator binding posts. Figure 10 shows the
correct connections.
Figure 10. Cable Connections for Resistance ≤19 kΩ
1
2
3
OUTPUT
VΩA
SENSE
VΩ
HI
HI
LO
LO
HVI
AUX
CURRENT
1
VirtualBench DMM
2
Multifunction Calibrator
3
NI VirtualBench Calibration Procedure
GUARD
GROUND
Low EMF Copper Cable
|
© National Instruments
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23
3.
Wait 2 minutes for the thermal EMF to stabilize.
4.
Call DMM Initialize Calibration with the following parameter:
5.
Call DMM Get Resistance Calibration Adjustment Points. This will return
two arrays:
•
Password = NI (default)
•
Range—A numerical array specifying the range being calibrated
•
Adjustment Point—A numerical array specifying the resistance values required to
perform the adjustment
6.
Output the adjustment point on the calibrator with 2-wire compensation turned on.
7.
Call DMM Setup Resistance Calibration with the following parameter:
•
Range—Supplied from DMM Get Resistance Calibration Adjustment Points
8.
Wait 5 seconds for settling.
9.
Call DMM Adjust Resistance Calibration with the following parameter:
•
Adjustment Point—Resistance value returned by the calibrator
10. Repeat steps 6 through 9 for the first four adjustment points.
11. To adjust resistance >19 kΩ, output the adjustment point on the calibrator with 2-wire
compensation turned off.
12. Call DMM Setup Resistance Calibration with the following parameter:
•
Range—Supplied from DMM Get Resistance Calibration Adjustment Points
13. Wait 5 seconds for settling.
14. Call DMM Adjust Resistance Calibration with the following parameter:
•
Adjustment Point—Resistance value returned by the calibrator
15. Repeat steps 11 through 14 for the last eight adjustment points.
16. Call DMM Close Calibration with the following parameter:
•
Action Input = Commit
17. Reset the calibrator for safety reasons.
18. Disconnect all cables from the calibrator and VirtualBench.
You have completed adjusting the resistance function of the VirtualBench.
24
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NI VirtualBench Calibration Procedure
Adjusting AC and DC Current
To adjust the AC and DC current functions of the VirtualBench, complete the following steps:
1.
Reset the calibrator.
2.
To adjust 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 11 shows the
correct connections.
Figure 11. Cable Connections for Current Ranges <1 A
1
2
3
OUTPUT
VΩA
SENSE
VΩ
HI
HI
LO
LO
HVI
AUX
CURRENT
1
3.
4.
VirtualBench DMM
Multifunction Calibrator
3
GROUND
Low EMF Copper Cable
Wait 2 minutes for the thermal EMF to stabilize.
Call DMM Initialize Calibration with the following parameter:
•
5.
2
GUARD
Password = NI (default)
Call DMM Get Current Calibration Adjustment Points. This will return two
arrays:
•
Range—A numerical array specifying the range being calibrated
•
Adjustment Point—A numerical array specifying the current required to perform the
adjustment
6.
Output the adjustment point on the calibrator.
7.
Call DMM Adjust Current Calibration with the following parameters:
8.
•
Range—Supplied from the output of DMM Get Current Calibration Adjustment
Points
•
Adjustment Point—Supplied from the output of DMM Get Current Calibration
Adjustment Points
Repeat steps 6 through 7 for the first six adjustment points.
NI VirtualBench Calibration Procedure
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© National Instruments
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25
9.
To adjust current ranges ≥1 A, connect an amplifier to the calibrator, connect the connectors
on one end of the low EMF copper cable to the VirtualBench A and LO banana plug
connectors, and connect the connectors on the other end of the cable to the HI and LO
binding posts on the amplifier. Figure 12 shows the correct connections.
Figure 12. Cable Connections for Current Ranges ≥1 A
4
HI
LO
1
5
3
OUTPUT
VΩA
SENSE
VΩ
HI
HI
LO
LO
HVI
2
1
2
3
VirtualBench DMM
Multifunction Calibrator
Low EMF Copper Cable
4
5
AUX
CURRENT
GUARD
GROUND
Amplifier
Shielded Interface Cable
10. Wait 2 minutes for the thermal EMF to stabilize.
11. Repeat steps 6 through 7 for the last six adjustment points.
12. Call DMM Close Calibration with the following parameter:
•
Action Input = Commit.
13. Reset the calibrator for safety reasons.
14. Disconnect all cables from the calibrator and VirtualBench.
You have completed adjusting the current functions of the VirtualBench.
DMM EEPROM Update
When an adjustment procedure for the DMM is completed, the VirtualBench internal calibration
memory (EEPROM) is immediately updated.
If you do not want to perform an adjustment, you can update the calibration date and onboard
calibration temperature without making any adjustments by calling Cal Set Calibration
Information.
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NI VirtualBench Calibration Procedure
DMM Re-Verification
Repeat the DMM Verification section to determine the As-Left status of the instrument.
If any test fails re-verification after performing an adjustment, verify that you
have met the conditions listed in the DMM Test Conditions section before returning
your device to NI. Refer to Where to Go for Support for assistance in returning the
device to NI.
Note
Oscilloscope Calibration Procedure
This section contains the verification and adjustment procedures for the oscilloscope on the
VirtualBench. The calibration process includes the following steps:
1.
Oscilloscope Initial Setup—Set up the test equipment.
2.
Oscilloscope Verification—Verify the existing operation of the instrument. This step
confirms whether the instrument is operating within its specified range prior to adjustment.
3.
Oscilloscope Adjustment—Perform an external adjustment of the instrument that adjusts
the calibration constants with respect to standards of known values.
4.
Oscilloscope Re-Verification—Repeat the verification procedure to ensure that the
instrument is operating within its specifications after adjustment.
These steps are described in more detail in the following sections.
Oscilloscope Test Equipment
Table 12 lists the equipment recommended for the oscilloscope performance verification and
adjustment procedures. If the recommended equipment is not available, select a substitute using
the requirements listed in the table.
Table 12. Recommended Equipment
Equipment
Recommended
Model
Minimum Requirements
50 Ω terminator
Amphenol
000-46650-51RFX
VB-8012 only.
Oscilloscope
calibrator
Fluke 9500B
calibrator
Vertical gain: DC ±(0.025% + 25 μV) into
1 MΩ
Oscilloscope
calibrator active
head
Fluke 9530
DC operation
NI VirtualBench Calibration Procedure
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27
Table 12. Recommended Equipment (Continued)
Equipment
Recommended
Model
Minimum Requirements
Function generator
NI 5421
Must be able to generate a 1 kHz square
wave between 36 mVpp and 18 Vpp with
less than 200 ns rise time and less than 5%
overshoot.
SMB to BNC cable
NI part number
778827-01
Cable needed to connect from the function
generator to the VirtualBench BNC
connectors.
Oscilloscope Test Conditions
Follow these guidelines to optimize the equipment and the environment during calibration:
•
Keep connections to the device as short as possible. Long cables and wires act as antennae,
picking up noise that can affect measurements.
•
Use a USB connection between the PC and VirtualBench.
•
Verify that all connections to the device, including front panel connections, are secure.
•
Keep relative humidity between 10% and 80% noncondensing.
•
Allow a warm up time of at least 30 minutes to ensure that the VirtualBench is at a stable
operating temperature.
•
Plug the VirtualBench, PC, and the test equipment into the same power strip to avoid
ground loops.
•
Verification limits are defined assuming the same test equipment is used during verification
and adjustment.
•
Maintain an ambient temperature of 23 ±5 °C. The device temperature will be greater than
the ambient temperature.
Oscilloscope Initial Setup
This section is necessary for pre-adjustment verifications only. If you are
performing a post-adjustment verification, skip the setup and go directly to the
Oscilloscope Verification section.
Note
To set up the test equipment, complete the following steps.
1.
If VirtualBench is running, shut down all instruments on the VirtualBench, and close the
VirtualBench software. Remove all signal connections.
2.
Verify that the oscilloscope calibrator has been calibrated within the time limits specified
in its specifications, and that a self-calibration has been performed before VirtualBench
calibration. Consult the oscilloscope calibrator user documentation for instructions on
calibrating these devices.
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NI VirtualBench Calibration Procedure
Ensure that the VirtualBench is warmed up for at least 30 minutes and the
calibrator is warmed up for the minimum time required as specified in its user
documentation.
Note
3.
Verify that a self-calibration has been performed on the function generator before
VirtualBench calibration.
Oscilloscope Verification
You can use the verification procedure described in this section for both pre-adjustment and
post-adjustment verification.
Verifying the Oscilloscope Offset
Complete the following steps to verify the VirtualBench oscilloscope offset.
In this procedure, the 50 Ω BNC terminator is only needed for the VB-8012.
The VB-8034 and VB-8054 use an internal 50 Ω BNC terminator during calibration.
Note
1.
(VB-8012) Connect a 50 Ω BNC terminator to oscilloscope channel 1, as shown in
Figure 13.
(VB-8034/8054) Ensure there are no cables connected to any oscilloscope channels.
Figure 13. VB-8012 Oscilloscope Offset Channel 1 Connection Diagram
1
1
VB-8012 Oscilloscope
2
2
50 Ω Terminator
2.
Call MSO Initialize.
3.
Call MSO Configure Timing with the following parameter:
•
Sample Rate = 1M
•
Acquisition Time (s) = 0.1
•
Pretrigger Time (s) = 1e-9
•
Sampling Mode = Sample
NI VirtualBench Calibration Procedure
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29
4.
Call MSO Configure Analog Channel with the following parameters:
•
Enable Channel = TRUE
•
Channel = mso/1
•
Vertical Coupling = DC
•
Probe Attenuation = 1x
•
Vertical Range = 20
•
Vertical Offset = 0
5.
Call MSO Run.
6.
Call MSO Read. Calculate and record the average analog waveform. Verify that this
measurement falls within the limits in Table 13.
Table 13. Oscilloscope Offset Verification Limits
1 Year Limits (mV)
24 Hour Limits (mV)
Range
(V)
Verification
Point (V)
Lower
Upper
Lower
Upper
20
0
-400
400
-100
100
10
-200
200
-50
50
5
-100
100
-30
30
2
-40
40
-12
12
1
-20
20
-6
6
0.5
-10
10
-3
3
0.2
-4
4
-1.2
1.2
0.1
-2
2
-0.8
0.8
0.05
-1
1
-0.6
0.6
0.02*
-0.4
0.4
-0.3
0.3
* VB-8034 and VB-8054 only.
7.
Call MSO Stop.
8.
Repeat steps 4 to 7 for all of the ranges in Table 13.
Note
9.
30
The 0.02 V range only applies to the VB-8034 and VB-8054.
Call MSO Close.
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NI VirtualBench Calibration Procedure
10. (VB-8012) Remove the 50 Ω BNC terminator from channel 1 and connect it to channel 2,
as shown in Figure 14.
Figure 14. VB-8012 Oscilloscope Offset Channel 2 Connection Diagram
1
1
VB-8012 Oscilloscope
2
2
50 Ω Terminator
11. Repeat steps 2 to 9 for all ranges on channel 2.
Note When calling MSO Configure Analog Channel in step 4, change the
Channel input to mso/2.
12. (VB-8012) Remove the 50 Ω BNC terminator from channel 2.
13. (VB-8034/8054) Repeat steps 2 to 9 for all ranges on channel 3.
Note When calling MSO Configure Analog Channel in step 4, change the
Channel input to mso/3.
14. (VB-8034/8054) Repeat steps 2 to 9 for all ranges on channel 4.
Note When calling MSO Configure Analog Channel in step 4, change the
Channel input to mso/4.
NI VirtualBench Calibration Procedure
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31
Verifying the Oscilloscope Gain
Complete the following steps to verify the VirtualBench oscilloscope gain.
1.
Connect VirtualBench channel 1 to the oscilloscope calibrator active head, as shown in
Figure 15.
Figure 15. Oscilloscope Gain Channel 1 Connection Diagram
1
2
3
CH 1
CH 2
1
2
VirtualBench Oscilloscope
Oscilloscope Calibrator
3
Oscilloscope Calibrator Active Head
2.
Call MSO Initialize.
3.
Call MSO Configure Timing with the following parameters:
4.
32
•
Sample Rate = 1M
•
Acquisition Time (s) = 0.1
•
Pretrigger Time (s) = 1e-9
•
Sampling Mode = Sample
Call MSO Configure Analog Channel with the following parameters:
•
Enable Channel = TRUE
•
Channel = mso/1
•
Vertical Coupling = DC
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NI VirtualBench Calibration Procedure
•
Probe Attenuation = 1x
•
Vertical Range = 20
•
Vertical Offset = 0
Note
5.
Configure the oscilloscope calibrator for high impedance loads.
Set the oscilloscope calibrator DC voltage output to -90% of the range, or -18 V.
6.
Wait at least 5 seconds for the oscilloscope calibrator to settle.
7.
Call MSO Run.
8.
Call MSO Read. Calculate and record the average analog waveform. Save this value as
Vmeas_neg.
9.
Set the oscilloscope calibrator DC voltage output to +90% of the range, or +18 V.
10. Wait at least 5 seconds for the oscilloscope calibrator to settle.
11. Call MSO Run.
12. Call MSO Read. Calculate and record the average analog waveform. Save this value as
Vmeas_pos.
13. Call MSO Stop.
14. Calculate the gain error as follows:
( V meas_pos – V meas_neg )
--------------------------------------------------------- – 1 × 100%
( V pos – V neg )
Where Vpos and Vneg are listed in Table 14.
Verify that this calculation falls within the limits in Table 14.
Table 14. Oscilloscope Gain Verification Limits
1 Year Limits (%)
24 Hour Limits (%)
Range (V)
Vpos (V)
Vneg (V)
Lower
Upper
Lower
Upper
20
18
-18
-2
2
-0.8
0.8
10
9
-9
-2
2
-0.8
0.8
5
4.5
-4.5
-2
2
-0.8
0.8
2
1.8
-1.8
-2
2
-0.8
0.8
1
0.9
-0.9
-2
2
-0.8
0.8
0.5
0.45
-0.45
-2
2
-0.9
0.9
0.2
0.18
-0.18
-2
2
-0.9
0.9
0.1
0.09
-0.09
-2
2
-1
1
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Table 14. Oscilloscope Gain Verification Limits (Continued)
1 Year Limits (%)
24 Hour Limits (%)
Range (V)
Vpos (V)
Vneg (V)
Lower
Upper
Lower
Upper
0.05
0.045
-0.045
-2
2
-1
1
0.02*
0.018
-0.018
-2
2
-1.2
1.2
* VB-8034 and VB-8054 only.
15. Repeat steps 4 to 14 for all of the ranges with the values for Vpos and Vneg in Table 14.
Note
The 0.02 V range only applies to the VB-8034 and VB-8054.
16. Call MSO Close.
17. Remove the connections from channel 1. Connect VirtualBench channel 2 to the
oscilloscope calibrator active head, as shown in Figure 16.
Figure 16. Oscilloscope Gain Channel 2 Connection Diagram
2
3
1
CH 1
CH 2
1
34
VirtualBench Oscilloscope
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Oscilloscope Calibrator
NI VirtualBench Calibration Procedure
3
Oscilloscope Calibrator Active Head
18. Repeat steps 2 to 16 for all ranges on channel 2.
Note When calling MSO Configure Analog Channel in step 4, change the
Channel input to mso/2.
19. Remove the connections from channel 2.
20. (VB-8034/8054) Connect VirtualBench channel 3 to the oscilloscope calibrator active
head, as shown in Figure 17.
Figure 17. VB-8034/8054 Oscilloscope Gain Channel 3 Connection Diagram
1
2
3
CH 1
CH 2
1
VirtualBench Oscilloscope
2
Oscilloscope Calibrator
3
Oscilloscope Calibrator Active Head
21. (VB-8034/8054) Repeat steps 2 to 16 for all ranges on channel 3.
(VB-8034/8054) When calling MSO Configure Analog Channel in
step 4, change the Channel input to mso/3.
Note
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22. (VB-8034/8054) Remove the connections from channel 3. Connect VirtualBench channel
4 to the oscilloscope calibrator active head, as shown in Figure 18.
Figure 18. VB-8034/8054 Oscilloscope Gain Channel 4 Connection Diagram
1
2
3
CH 1
CH 2
1
VirtualBench Oscilloscope
2
Oscilloscope Calibrator
3
Oscilloscope Calibrator Active Head
23. (VB-8034/8054) Repeat steps 2 to 16 for all ranges on channel 4.
(VB-8034/8054) When calling MSO Configure Analog Channel in
step 4, change the Channel input to mso/4.
Note
24. (VB-8034/8054) Remove the connections from channel 4.
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Verifying the Oscilloscope Offset DAC Gain
Complete the following steps to verify the VirtualBench Oscilloscope Offset DAC Gain.
1.
Connect VirtualBench channel 1 to the oscilloscope calibrator active head, as shown in
Figure 19.
Figure 19. Oscilloscope Gain Channel 1 Connection Diagram
2
3
1
CH 1
CH 2
1
2.
3.
VirtualBench Oscilloscope
2
Oscilloscope Calibrator
3
Oscilloscope Calibrator Active Head
Call MSO Initialize.
Call MSO Configure Timing with the following parameters:
•
Sample Rate = 1M
•
Acquisition Time (s) = 0.1
•
Pretrigger Time (s) = 1e-9
•
Sampling Mode = Sample
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4.
Call MSO Configure Analog Channel with the following parameters:
•
Enable Channel = TRUE
•
Channel = mso/1
•
Vertical Coupling = DC
•
Probe Attenuation = 1x
•
Vertical Range = 20
•
Vertical Offset = -18
5.
Set the oscilloscope calibrator DC voltage output to the programmed vertical offset,
or -18 V for this iteration.
6.
Wait at least 5 seconds for the oscilloscope calibrator and DUT to settle.
7.
Call MSO Run.
8.
Call MSO Read. Calculate and record the average analog waveform. Save this value as
Vmeas_neg.
9.
Call MSO Stop.
10. Call MSO Configure Analog Channel with the following parameters:
•
Enable Channel = TRUE
•
Channel = mso/1
•
Vertical Coupling = DC
•
Probe Attenuation = 1x
•
Vertical Range = 20
•
Vertical Offset = 18
11. Set the oscilloscope calibrator DC voltage output to the programmed vertical offset, or
+18 V for this iteration.
12. Wait at least 5 seconds for the oscilloscope calibrator and DUT to settle.
13. Call MSO Run.
14. Call MSO Read. Calculate and record the average analog waveform. Save this value as
Vmeas_pos.
15. Call MSO Stop.
16. Calculate the gain error as follows:
( V meas_pos – V meas_neg )
--------------------------------------------------------- – 1 × 100%
( V pos – V neg )
Where Vpos and Vneg are listed in Table 15.
Verify that this calculation falls within the limits in Table 15.
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Table 15. Oscilloscope Offset DAC Gain Verification Limits
Vertical
Range (V)
Vertical Offset (V)
1 Year Limits (%)
24 Hour Limits (%)
Vpos
Vneg
Lower
Upper
Lower
Upper
18
-18
-2
2
-1
1
10
-2
2
-0.7
0.7
5
-2
2
-0.5
0.5
2
-2
2
-0.5
0.5
1
-2
2
-0.5
0.5
0.5
-2
2
-0.5
0.5
-2
2
-0.5
0.5
0.1
-2
2
-0.5
0.5
0.05
-2
2
-0.5
0.5
0.02*
-2
2
-0.5
0.5
20
0.2
4.5
-4.5
* VB-8034 and VB-8054 only.
17. Repeat steps 4 to 16 for all of the ranges with the values for Vpos and Vneg in Table 15.
Note When calling MSO Configure Analog Channel the Vertical Range
input must match the range value in Table 15.
Note
The 0.02 V vertical range only applies to the VB-8034 and VB-8054.
18. Call MSO Close.
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19. Remove the connections from channel 1. Connect VirtualBench channel 2 to the
oscilloscope calibrator active head, as shown in Figure 20.
Figure 20. Oscilloscope Gain Channel 2 Connection Diagram
2
3
1
CH 1
CH 2
1
VirtualBench Oscilloscope
2
Oscilloscope Calibrator
3
Oscilloscope Calibrator Active Head
20. Repeat steps 2 to 18 for all ranges on channel 2.
Note When calling MSO Configure Analog Channel in step 4, change the
Channel input to mso/2.
21. Remove the connections from channel 2.
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NI VirtualBench Calibration Procedure
22. (VB-8034/8054) Connect VirtualBench channel 3 to the oscilloscope calibrator active
head, as shown in Figure 21.
Figure 21. VB-8034/8054 Oscilloscope Gain Channel 3 Connection Diagram
1
2
3
CH 1
CH 2
1
VirtualBench Oscilloscope
2
Oscilloscope Calibrator
3
Oscilloscope Calibrator Active Head
23. (VB-8034/8054) Repeat steps 2 to 18 for all ranges on channel 3.
(VB-8034/8054) When calling MSO Configure Analog Channel in
step 4, change the Channel input to mso/3.
Note
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24. (VB-8034/8054) Remove the connections from channel 3. Connect VirtualBench channel
4 to the oscilloscope calibrator active head, as shown in Figure 22.
Figure 22. VB-8034/8054 Oscilloscope Gain Channel 4 Connection Diagram
1
2
3
CH 1
CH 2
1
VirtualBench Oscilloscope
2
Oscilloscope Calibrator
3
Oscilloscope Calibrator Active Head
25. (VB-8034/8054) Repeat steps 2 to 18 for all ranges on channel 4.
(VB-8034/8054) When calling MSO Configure Analog Channel in
step 4, change the Channel input to mso/4.
Note
26. (VB-8034/8054) Remove the connections from channel 4.
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NI VirtualBench Calibration Procedure
Oscilloscope Adjustment
This section explains how to adjust the VirtualBench oscilloscope. You can choose to perform
these adjustment procedures with or without performing the verification procedures first.
NI recommends repeating the verification procedures after you perform these
adjustment procedures. Re-verification ensures that the instrument you have
calibrated is operating within specifications after adjustments.
Note
Note
Allow the VirtualBench to warm up for at least 30 minutes before adjusting.
To adjust the Oscilloscope accuracy perform the following steps:
In this procedure, the 50 Ω BNC terminator is only needed for the VB-8012.
The VB-8034 and VB-8054 use an internal 50 Ω BNC terminator during calibration.
Note
1.
(VB-8012) Connect a 50 Ω BNC terminator to Oscilloscope channel 1, as shown in
Figure 23.
(VB-8034/8054) Ensure there are no cables connected to any oscilloscope channels.
Figure 23. VB-8012 Oscilloscope Adjustment Channel 1 Connection Diagram
1
1
2.
VB-8012 Oscilloscope
2
50 Ω Terminator
Call MSO Initialize Calibration with the following parameter:
•
3.
2
Password = NI (default)
Call MSO Adjust Offset Calibration with the following parameter:
•
Channel = mso/1
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4.
(VB-8012) Disconnect the 50 Ω terminator
5.
Connect Channel 1 of the oscilloscope to Channel 0 of the function generator with the
BNC-to-SMB cable, as shown in Figure 24.
Figure 24. Oscilloscope Channel 1-to-Function Generator Connection Diagram
2
1
ACCESS
ACTIVE
CH 0
CLK
IN
PFI 0
3
DIGITAL DATA & CONTROL
PFI 1
1
6.
VirtualBench Oscilloscope
Function Generator
3
BNC-to-SMB Cable
Call MSO Get Compensator Attenuation Calibration Adjustment Points.
This will return three arrays:
•
Range—A numerical array specifying the range being calibrated
•
Amplitude—A numerical array specifying the square wave amplitude required for
calibration (Vpk-pk)
•
Frequency—A numerical array specifying the frequency of the calibration square
wave
Note
7.
2
Configure the function generator for high impedance loads.
Use the function generator to generate a square wave with the offset set to zero and duty
cycle set to 50%; the frequency and amplitude are supplied from the output of MSO Get
Compensator Attenuation Calibration Adjustment Points.
8.
Wait 100 milliseconds.
9.
Call MSO Adjust Compensator Attenuation Calibration with the following
parameters:
44
•
Channel—mso/1
•
Range—Supplied from the output of MSO Get Compensator Attenuation Calibration
Adjustment Points
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NI VirtualBench Calibration Procedure
•
Amplitude—Supplied from the output of MSO Get Compensator Attenuation
Calibration Adjustment Points
•
Frequency—Supplied from the output of MSO Get Compensator Attenuation
Calibration Adjustment Points
10. Repeat steps 7 to 9 for each adjustment point.
11. Disconnect the function generator. Connect VirtualBench channel 1 to the oscilloscope
calibrator active head, as shown in Figure 25.
Figure 25. Oscilloscope Gain Channel 1 Connection Diagram
2
3
1
CH 1
CH 2
1
VirtualBench Oscilloscope
2
Oscilloscope Calibrator
3
Oscilloscope Calibrator Active Head
12. Call MSO Get Range Calibration Adjustment Points. This will return
two arrays:
•
Range—A numerical array specifying the range being calibrated
•
Adjustment Point—A numerical array specifying the DC voltage required to perform
the adjustment
13. Use the oscilloscope calibrator to generate a DC voltage with the adjustment point supplied
from the output of MSO Get Range Calibration Adjustment Points.
14. Wait 5 seconds.
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15. Call MSO Adjust Range Calibration with the following parameters:
•
Channel—mso/1
•
Range—Supplied from the output of MSO Get Range Calibration Adjustment Points
•
Adjustment Point—Supplied from the output of MSO Get Range Calibration
Adjustment Points
16. Repeat steps 13 to 15 for each adjustment point.
17. Call MSO Get Offset DAC Calibration Adjustment Points. This will return
two arrays:
•
Range—A numerical array specifying the range being calibrated
•
Adjustment Point—A numerical array specifying the DC voltage required to perform
the adjustment
18. Use the oscilloscope calibrator to generate a DC voltage with the adjustment point supplied
from the output of MSO Get Offset DAC Calibration Adjustment Points.
19. Wait 5 seconds.
20. Call MSO Adjust Offset DAC Calibration with the following parameters:
•
Channel—mso/1
•
Range—A numerical array specifying the range being calibrated
•
Adjustment Point—A numerical array specifying the DC voltage required to perform
the adjustment
21. Repeat steps 18 to 20 for each adjustment point.
22. Remove the connections from channel 1.
23. (VB-8012) Connect a 50 Ω BNC terminator to oscilloscope channel 2, as shown in
Figure 26.
Figure 26. VB-8012 Oscilloscope Offset Channel 2 Connection Diagram
1
1
46
VB-8012 Oscilloscope
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NI VirtualBench Calibration Procedure
50 Ω Terminator
24. Repeat steps 3 to 21 for MSO channel 2.
Note
For all inputs, change the Channel input to mso/2.
25. (VB-8012) Skip to step 28.
26. (VB-8034/8054) Repeat steps 3 to 21 for MSO channel 3.
Note
(VB-8034/8054) For all inputs, change the Channel input to mso/3.
27. (VB-8034/8054) Repeat steps 3 to 21 for MSO channel 4.
Note
(VB-8034/8054) For all inputs, change the Channel input to mso/4.
28. Call MSO Close Calibration with the following parameter:
•
Action = Commit
You have completed adjusting the VirtualBench oscilloscope. It is recommended that a
post-adjustment verification be performed.
Oscilloscope EEPROM Update
When an adjustment procedure for the oscilloscope is completed, the VirtualBench internal
calibration memory (EEPROM) is immediately updated.
If you do not want to perform an adjustment, you can update the calibration date and onboard
calibration temperature without making any adjustments by calling Cal Set Calibration
Information.
Oscilloscope Re-Verification
Repeat the Oscilloscope Verification section to determine the As-Left status of the instrument.
If any test fails re-verification after performing an adjustment, verify that you
have met the conditions listed in the Oscilloscope Test Conditions section before
returning your device to NI. Refer to Where to Go for Support for assistance in
returning the device to NI.
Note
Function Generator (FGEN) Calibration
Procedure
This section contains the verification and adjustment procedures for the FGEN on the
VirtualBench. The calibration process includes the following steps:
1.
FGEN Initial Setup—Set up the test equipment.
2.
FGEN Verification—Verify the existing operation of the instrument. This step confirms
whether the instrument is operating within its specified range prior to adjustment.
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3.
FGEN Adjustment—Perform an external adjustment of the instrument that adjusts the
calibration constants with respect to standards of known values.
4.
FGEN Re-Verification—Repeat the verification procedure to ensure that the instrument is
operating within its specifications after adjustment.
These steps are described in more detail in the following sections.
FGEN Test Equipment
Table 16 lists the equipment recommended for the FGEN performance verification and
adjustment procedures. If the recommended equipment is not available, select a substitute using
the requirements listed in the table.
Table 16. Recommended Equipment
Equipment
Recommended
Model
Digital multimeter
(DMM)
NI PXI-4071
Banana
plug-to-BNC cable
Pomona 4530-C
Minimum Requirements
DC V accuracy: 21 ppm
DC input impedance: ≥1 GΩ
DC A accuracy: 310 ppm
—
FGEN Test Conditions
Follow these guidelines to optimize the equipment and the environment during calibration:
•
Keep connections to the device as short as possible. Long cables and wires act as antennae,
picking up noise that can affect measurements.
•
Use a USB connection between the PC and VirtualBench.
•
Verify that all connections to the device, including front panel connections, are secure.
•
Keep relative humidity between 10% and 80% noncondensing.
•
Allow a warmup time of at least 30 minutes to ensure that the VirtualBench is at a stable
operating temperature.
•
Plug the VirtualBench, PC, and the test equipment into the same power strip to avoid
ground loops.
•
Verification limits are defined assuming the same test equipment is used during verification
and adjustment.
•
Maintain an ambient temperature of 23 ±5 °C. The device temperature will be greater than
the ambient temperature.
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FGEN Initial Setup
This section is necessary for pre-adjustment verifications only. If you are
performing a post-adjustment verification, skip the setup and go directly to the
Verifying the FGEN Offset section.
Note
To set up the test equipment, complete the following steps.
1.
If VirtualBench is running, shut down all instruments on the VirtualBench, and close the
VirtualBench software. Remove all signal connections.
2.
Verify that the DMM has been calibrated within the proper calibration interval specified in
its specifications, and a self-calibration is performed.
Ensure that the VirtualBench is warmed up for at least 30 minutes and the
DMM is warmed up for the minimum time required as specified in its user
documentation.
Note
FGEN Verification
You can use the verification procedure described in this section for both pre-adjustment and
post-adjustment verification.
Verifying the FGEN Offset
Complete the following steps to verify the VirtualBench FGEN offset.
1.
Connect the voltage input HI and LO terminals of the DMM to the FGEN BNC using a
banana plug-to-BNC cable—observing the polarity of the banana plugs—as shown in
Figure 27.
Figure 27. Cable Connections for FGEN Verification and Adjustment
2
1
3
HI
1kV
MAX 1kV
MAX
INPUT
LO
3A, 250V AMPS
MAX
HI
300V
MAX
LO
500V MAX
1
VirtualBench FGEN
2
DMM
3
Banana Plug-to-BNC Cable
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2.
Call FGEN Initialize.
3.
Call FGEN Configure Standard Waveform with the following parameters:
4.
•
Waveform Function = DC
•
DC Offset = 0
Call FGEN Enable Filter with the following parameter:
•
Enable Filter = TRUE
5.
Call FGEN Run to enable the output.
6.
Wait at least 100 milliseconds for settling.
7.
Perform a measurement with the DMM in the 100 mV range. Compare to the limits listed
in Table 17.
Table 17. FGEN Offset Calibration Limits
8.
Verification
Point (V)
FGEN
Enable Filter
Setting
Lower
Upper
Lower
Upper
0
TRUE (On)
-0.008
0.008
-0.003
0.003
0
FALSE (Off)
-0.008
0.008
-0.003
0.003
24 Hour Limits (V)
Call FGEN Enable Filter with the following parameter:
•
9.
1 Year Limits (V)
Enable Filter = FALSE
Wait at least 100 milliseconds for settling.
10. Perform a measurement with the DMM in the 100 mV range. Compare to the limits listed
in Table 17.
11. Call FGEN Close.
Verifying the FGEN Gain
Complete the following steps to verify the VirtualBench FGEN gain.
1.
Connect the voltage input HI and LO terminals of the DMM to the FGEN BNC using a
banana plug-to-BNC cable—observing the polarity of the banana plugs—as shown in
Figure 27.
2.
Call FGEN Initialize.
3.
Call FGEN Configure Standard Waveform with the following parameters:
4.
•
Waveform Function = DC
•
DC Offset = 12
Call FGEN Enable Filter with the following parameter:
•
50
Enable Filter = TRUE
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NI VirtualBench Calibration Procedure
5.
Wait at least 100 milliseconds for settling.
6.
Call FGEN Run.
7.
Perform a measurement with the DMM in the best available range greater than 12 V.
Compare to the limits listed in Table 18.
Table 18. FGEN Gain Calibration Limits
Verification
Point (V)
FGEN
Enable Filter
Setting
Lower
Upper
Lower
Upper
+12
TRUE (On)
11.88
12.12
11.98
12.02
FALSE (Off)
11.88
12.12
11.98
12.02
TRUE (On)
-12.12
-11.88
-12.02
-11.98
FALSE (Off)
-12.12
-11.88
-12.02
-11.98
-12
8.
24 Hour Limits (V)
Call FGEN Enable Filter with the following parameter:
•
9.
1 Year Limits (V)
Enable Filter = FALSE
Wait at least 100 milliseconds for settling.
10. Perform a measurement with the DMM in the best available range greater than 12 V.
Compare to the limits listed in Table 18.
11. Repeat steps 3 through 10 for all verification points in Table 18.
12. Call FGEN Close.
FGEN Adjustment
This section explains how to adjust the VirtualBench FGEN. You can choose to perform these
adjustment procedures with or without performing the verification procedures first.
NI recommends repeating the verification procedures after you perform these
adjustment procedures. Re-verification ensures that the instrument you have
calibrated is operating within specifications after adjustments.
Note
Note Before adjustment perform a self-calibration on the DMM performing the
adjustment.
Note
Allow the VirtualBench to warm up for at least 30 minutes before adjusting.
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To adjust the FGEN accuracy complete the following steps.
1.
Connect the voltage input HI and LO terminals of the DMM to the FGEN BNC using a
banana plug-to-BNC cable—observing the polarity of the banana plugs—as shown in
Figure 28.
Figure 28. Cable Connections for FGEN Verification and Adjustment
2
1
3
HI
1kV
MAX 1kV
MAX
INPUT
LO
3A, 250V AMPS
MAX
HI
300V
MAX
LO
500V MAX
1
2.
VirtualBench FGEN
DMM
3
Banana Plug-to-BNC Cable
Call FGEN Initialize Calibration with the following parameter:
•
3.
2
Password = NI (default)
Call FGEN Setup Offset Calibration with the following parameter:
•
Enable Filter = TRUE
4.
Wait 100 milliseconds.
5.
Perform a measurement with the DMM in the 1 V range. Record the reference value
measurement.
6.
Call FGEN Adjust Offset Calibration with the following parameter:
7.
Repeat steps 3 through 6 until FGEN Adjust Offset Calibration returns TRUE
from its Calibration Done output.
8.
Repeat steps 3 through 7 with the following parameter:
•
•
9.
52
Reference Value—Supplied from measurement in step 5
Enable Filter = FALSE
Call FGEN Get Gain Calibration Adjustment Points. This will return
two arrays:
•
Enable Filter—A Boolean array of filter settings
•
Adjustment Point—An array of voltage points used in the gain adjustment steps
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NI VirtualBench Calibration Procedure
10. Call FGEN Setup Gain Calibration with the following parameters:
•
Enable Filter—Supplied from the output of FGEN Get Gain Calibration Adjustment
Points
•
Adjustment Point—Supplied from the output of FGEN Get Gain Calibration
Adjustment Points
11. Wait 100 milliseconds.
12. Perform a measurement with the DMM in a range greater than 12 V. Record the reference
value measurement.
13. Call FGEN Adjust Gain Calibration with the following parameter:
•
Reference Value—Supplied from measurement in step 12
14. Repeat steps 10 through 13 for all adjustment points.
15. Call FGEN Close Calibration with the following parameter:
•
Action = Commit
You have completed adjusting the VirtualBench FGEN. It is recommended that you perform a
post-adjustment verification.
FGEN EEPROM Update
When an adjustment procedure for the FGEN is completed, the VirtualBench internal calibration
memory (EEPROM) is immediately updated.
If you do not want to perform an adjustment, you can update the calibration date and onboard
calibration temperature without making any adjustments by calling Cal Set Calibration
Information.
FGEN Re-Verification
Repeat the FGEN Verification section to determine the As-Left status of the instrument.
If any test fails re-verification after performing an adjustment, verify that you
have met the conditions listed in the FGEN Test Conditions section before returning
your device to NI. Refer to Where to Go for Support for assistance in returning the
device to NI.
Note
DC Power Supply Calibration Procedure
This section contains the verification and adjustment procedures for the DC power supply on the
VirtualBench. The calibration process includes the following steps:
1.
DC Power Supply Initial Setup—Set up the test equipment.
2.
DC Power Supply Verification—Verify the existing operation of the instrument. This step
confirms whether the instrument is operating within its specified range prior to adjustment.
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3.
DC Power Supply Adjustment—Perform an external adjustment of the instrument that
adjusts the calibration constants with respect to standards of known values.
4.
DC Power Supply Re-Verification—Repeat the verification procedure to ensure that the
instrument is operating within its specifications after adjustment.
These steps are described in more detail in the following sections.
If you are calibrating both the DMM and the DC power supply, the DMM
must be calibrated first.
Note
DC Power Supply Test Equipment
Table 19 lists the equipment recommended for the DC power supply performance verification
and adjustment procedures. If the recommended equipment is not available, select a substitute
using the requirements listed in the table.
Table 19. Recommended Equipment
Equipment
Digital multimeter
(DMM)
Cabling wire
Recommended
Model
NI PXI-4071
—
Minimum Requirements
DC V accuracy: 21 ppm at 25 V
DC input impedance: ≥1 GΩ
DC A accuracy: 310 ppm at 1 A, 460 ppm
at 2 A
18 AWG to 22 AWG. Twisted pair, shielded
cabling wire is recommended
DC Power Supply Test Conditions
Follow these guidelines to optimize the equipment and the environment during calibration:
•
Keep connections to the device as short as possible. Long cables and wires act as antennae,
picking up noise that can affect measurements.
•
Use a USB connection between the PC and VirtualBench.
•
Verify that all connections to the device, including front panel connections, are secure.
•
Use shielded copper wire for all cable connections. Use twisted-pair, shielded wire to
reduce measurement error in noisy environments.
•
Keep relative humidity between 10% and 80% noncondensing.
•
Allow a warm up time of at least 30 minutes to ensure that the VirtualBench is at a stable
operating temperature.
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NI VirtualBench Calibration Procedure
•
Plug the VirtualBench, PC, and the test equipment into the same power strip to avoid
ground loops.
•
Verification limits are defined assuming the same test equipment is used during verification
and adjustment.
•
Maintain an ambient temperature of 23 ±5 °C. The device temperature will be greater than
the ambient temperature.
DC Power Supply Initial Setup
This section is necessary for pre-adjustment verifications only. If you are
performing a post-adjustment verification, skip the setup and go directly to the
DC Power Supply Verification section.
Note
To set up the test equipment, complete the following steps:
1.
If VirtualBench is running, shut down all instruments on the VirtualBench, and close the
VirtualBench software. Remove all signal connections.
2.
Verify that the DMM has been calibrated within the proper calibration interval specified in
its specifications, and a self-calibration is performed.
Ensure that the VirtualBench is warmed up for at least 30 minutes and the
DMM is warmed up for the minimum time required as specified in its user
documentation.
Note
Note Before verifying or adjusting the DC power supply, you must enable and set
the output voltages at full scale for a minimum of 15 minutes.
Note If you are calibrating both the DMM and the DC power supply, the DMM
must be calibrated first.
DC Power Supply Verification
You can use the verification procedure described in this section for both pre-adjustment and
post-adjustment verification.
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Verifying Voltage Programming and Measurement Accuracy
To verify the voltage programming and measurement accuracy on the +6 V, +25 V, and -25 V
channels, complete the following steps.
1.
Reset the DMM and configure it for the 10 V range.
2.
Connect Channel +6 V to Volts HI, and GND to Volts LO with cabling wire, as shown in
Figure 29.
Figure 29. Cable Connections For +6 V Voltage Programming Accuracy Verification
HI
1kV
MAX 1kV
MAX
INPUT
LO
3A, 250V AMPS
MAX
HI
300V
MAX
3
LO
500V MAX
1
2
HI
1kV
MAX 1kV
MAX
INPUT
LO
3A, 250V AMPS
MAX
HI
300V
MAX
3
LO
500V MAX
1
VirtualBench DC Power Supply
2
DMM
3
3.
Call PS Initialize.
4.
Call PS Enable All Outputs with the following parameter:
•
56
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NI VirtualBench Calibration Procedure
Cabling Wire
5.
Call PS Configure Voltage Output with the following parameters:
•
Channel = ps/+6V
•
Voltage Level = 0, as listed in the first row of the Verification Point column of
Table 20 or 21
•
Current Limit = 1 or 3, as listed in the first row of the Current Limit column of
Table 20 or 21
6.
Wait at least 150 milliseconds for the DC power supply to settle.
7.
Measure the output voltage with the DMM and record the reading. Subtract the DMM
reading from the verification point. Verify that the calculation falls between the limits in
Table 20 or 21.
Table 20. VB-8012 DC Power Supply Voltage Programming and Measurement Accuracy
Channel
Verification
Point (V)
Current
Limit (A)
1 Year Limits ±(V)
24 Hour Limits
±(V)
+6 V
0
1
0.0050
0.0020
1.5
0.0065
0.0024
3
0.0080
0.0028
4.5
0.0095
0.0031
6
0.0110
0.0035
0.0200
0.0080
6.5
0.0265
0.0096
12.5
0.0325
0.0111
18.75
0.0388
0.0127
25
0.0450
0.0143
0.0200
0.0080
-6.5
0.0265
0.0096
-12.5
0.0325
0.0111
-18.75
0.0388
0.0127
-25
0.0450
0.0143
+25 V
-25 V
0
0
0.5
0.5
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57
Table 21. VB-8034/8054 DC Power Supply Voltage Programming
and Measurement Accuracy
Channel
Verification
Point (V)
Current
Limit (A)
1 Year Limits ±(V)
24 Hour Limits
±(V)
+6 V
0
3
0.0050
0.0020
1.5
0.0065
0.0024
3
0.0080
0.0028
4.5
0.0095
0.0031
6
0.0110
0.0035
0.0200
0.0080
6.5
0.0265
0.0096
12.5
0.0325
0.0111
18.75
0.0388
0.0127
25
0.0450
0.0143
0.0200
0.0080
-6.5
0.0265
0.0096
-12.5
0.0325
0.0111
-18.75
0.0388
0.0127
-25
0.0450
0.0143
+25 V
0
-25 V
0
1
1
Use the values in the 1 Year Limits column. The values in the 24 Hour Limits
column are for a post-adjustment verification only.
Note
8.
Call PS Read Output with the following parameter:
•
9.
Channel = ps/+6V
Subtract the DMM reading from step 7 from the DC power supply Actual Voltage Level
reading in step 8. Verify that calculation falls between the limits in Table 20 or 21.
10. Repeat steps 5 through 9 for each verification point on this channel.
11. Call PS Reset Instrument.
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12. Disconnect all connections and connect Channel +25 V to Volts HI and GND and Common
Floating GND to Volts LO as shown in Figure 30.
Figure 30. Cable Connections For +25 V Voltage Programming Accuracy Verification
HI
1kV
MAX 1kV
MAX
INPUT
LO
3A, 250V AMPS
MAX
HI
300V
MAX
3
LO
500V MAX
1
2
HI
1kV
MAX 1kV
MAX
INPUT
LO
3A, 250V AMPS
MAX
HI
300V
MAX
3
LO
500V MAX
1
VirtualBench DC Power Supply
2
DMM
3
Cabling Wire
13. Configure the DMM for the 100 V range.
14. Repeat steps 4 through 11 for the ps/+25V channel
NI VirtualBench Calibration Procedure
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59
15. Disconnect all connections and connect Channel -25 V to Volts HI, and GND to Volts LO
as shown in Figure 31. Connect GND and Common Floating GND with a jumper.
Figure 31. Cable Connections For -25 V Voltage Programming Accuracy Verification
HI
1kV
MAX 1kV
MAX
INPUT
LO
3A, 250V AMPS
MAX
HI
300V
MAX
3
LO
500V MAX
1
2
HI
1kV
MAX 1kV
MAX
INPUT
LO
3A, 250V AMPS
MAX
HI
300V
MAX
3
LO
500V MAX
1
VirtualBench DC Power Supply
2
DMM
16. Repeat steps 4 through 11 for the ps/-25V channel.
17. Disconnect all connections.
18. Call PS Close.
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NI VirtualBench Calibration Procedure
3
Cabling Wire
Verifying Current Programming and Measurement Accuracy
To verify the current programming and measurement accuracy of the DC power supply,
complete the following steps.
1.
Reset the DMM and configure it for the 1 A range for the VB-8012 or the 3 A range for the
VB-8034/8054.
2.
Connect Channel +6 V to Amps HI, and GND to Amps LO as shown in Figure 32.
Figure 32. Cable Connections For +6 V Current Programming Accuracy Verification
HI
1kV
MAX 1kV
MAX
INPUT
LO
3A, 250V AMPS
MAX
HI
300V
MAX
3
LO
500V MAX
1
2
HI
1kV
MAX 1kV
MAX
INPUT
LO
3A, 250V AMPS
MAX
HI
300V
MAX
3
LO
500V MAX
1
VirtualBench DC Power Supply
2
DMM
3
Cabling Wire
3.
Call PS Initialize.
4.
Call PS Enable All Outputs with the following parameter:
•
Enable Outputs = TRUE
NI VirtualBench Calibration Procedure
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61
5.
Call PS Configure Current Output with the following parameters:
•
Channel = ps/+6V
•
Current Level = 0.01 or 0.03, as listed in the first row of the Verification Point
column of Table 22 or 23
•
Voltage Limit = 6, as listed in the first row of the Voltage Limit column of
Table 22 or 23
6.
Wait for the DC power supply to settle. The VB-8012 requires at least 60 seconds of settling
time. The VB-8034/8054 requires at least 5 seconds of settling time.
7.
Measure the output voltage with the DMM and record the reading. Subtract the DMM
reading from the verification point. Verify that the calculation falls between the limits in
Table 22 or 23.
Table 22. VB-8012 DC Power Supply Current Programming and Measurement Accuracy
Channel
Verification
Point (A)
Voltage
Limit (V)
1 Year Limits ±(A)
24 Hour Limits
±(A)
+6 V
0.01
6
0.01002
0.00201
0.01200
0.00300
0.00401
0.00101
0.00475
0.00150
0.00401
0.00101
0.00475
0.00150
1
+25 V
0.005
25
0.5
-25 V
0.005
-25
0.5
Table 23. VB-8034/8054 DC Power Supply Current Programming and Measurement
Accuracy
Channel
Verification
Point (A)
Voltage
Limit (V)
1 Year Limits ±(A)
24 Hour Limits
±(A)
+6 V
0.03
6
0.01006
0.001058
0.01400
0.001550
0.00402
0.000323
0.00550
0.000570
0.00402
0.000323
0.00550
0.000570
2
+25 V
0.01
25
1
-25 V
0.01
-25
1
Use the values in the 1 Year Limits column. The values in the 24 Hour Limits
column are for a post-adjustment verification only.
Note
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NI VirtualBench Calibration Procedure
8.
Call PS Read Output with the following parameter:
•
9.
Channel = ps/+6V
Subtract the DMM reading from step 7 from the DC power supply Actual Current Level
reading in step 8. Verify that calculation falls between the limits in Table 22 or 23.
10. Repeat steps 5 through 9 for each verification point on this channel.
11. Call PS Reset Instrument.
12. Disconnect all connections and connect Channel +25 V to Amps HI, and Common Floating
GND to Amps LO as shown in Figure 33. Connect GND and Common Floating GND with
a jumper.
Figure 33. Cable Connections For +25 V Current Programming Accuracy Verification
HI
1kV
MAX 1kV
MAX
INPUT
LO
3A, 250V AMPS
MAX
HI
300V
MAX
3
LO
500V MAX
1
2
HI
1kV
MAX 1kV
MAX
INPUT
LO
3A, 250V AMPS
MAX
HI
300V
MAX
3
LO
500V MAX
1
VirtualBench DC Power Supply
2
DMM
3
Cabling Wire
13. Repeat steps 5 through 11 for the ps/+25V channel.
NI VirtualBench Calibration Procedure
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© National Instruments
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63
14. Disconnect all connections and connect Channel -25 V to Amps LO, and Common Floating
GND to Amps HI as shown in Figure 34. Connect GND and Common Floating GND with
a jumper.
Figure 34. Cable Connections For -25 V Current Programming Accuracy Verification
HI
1kV
MAX 1kV
MAX
INPUT
LO
3A, 250V AMPS
MAX
HI
300V
MAX
3
LO
500V MAX
1
2
HI
1kV
MAX 1kV
MAX
INPUT
LO
3A, 250V AMPS
MAX
HI
300V
MAX
3
LO
500V MAX
1
VirtualBench DC Power Supply
2
DMM
3
Cabling Wire
15. Repeat steps 5 through 11 for the ps/-25V channel.
16. Disconnect all connections.
17. Call PS Close.
If the instrument has successfully passed all verification tests, the DC power supply is within the
published specifications, and adjustment is optional.
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NI VirtualBench Calibration Procedure
DC Power Supply Adjustment
This section explains how to adjust the VirtualBench DC power supply. You can choose to
perform these adjustment procedures with or without performing the verification procedures first.
NI recommends repeating the verification procedures after you perform these
adjustment procedures. Re-verification ensures that the instrument you have
calibrated is operating within specifications after adjustments.
Note
Note Before adjustment perform a self-calibration on the DMM performing the
adjustment.
Note
Allow the VirtualBench to warm up for at least 30 minutes before adjusting.
Before adjusting the DC power supply, you must enable and set the output
voltages at full scale for a minimum of 15 minutes.
Note
Adjusting Voltage Programming and Measurement Accuracy
Complete the following steps to adjust voltage programming and measurement accuracy of
VirtualBench.
1.
Reset the DMM.
2.
Call PS Initialize Calibration with the following parameters:
3.
•
Cal Type = Voltage
•
Password = NI (default)
Connect Channel +6 V to Volts HI, and GND to Volts LO as shown in Figure 35.
NI VirtualBench Calibration Procedure
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© National Instruments
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65
Figure 35. Cable Connections For +6 V Voltage Programming and
Measurement Accuracy Adjustment
HI
1kV
MAX 1kV
MAX
INPUT
LO
3A, 250V AMPS
MAX
HI
300V
MAX
3
LO
500V MAX
1
2
HI
1kV
MAX 1kV
MAX
INPUT
LO
3A, 250V AMPS
MAX
HI
300V
MAX
3
LO
500V MAX
1
4.
VirtualBench DC Power Supply
2
DMM
3
Cabling Wire
Call PS Get Adjustment Points with the following parameter:
•
Channel = ps/+6V
This will return an array:
•
5.
Adjustment Points—An array of voltage points used in the adjustment steps
Call PS Set Adjustment Point with the following parameters:
•
Channel = ps/+6V
•
Adjustment Point—Supplied from the output of PS Get Adjustment Points
6.
Wait at least 150 milliseconds for the DC power supply to settle.
7.
Measure the output voltage with the DMM.
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NI VirtualBench Calibration Procedure
8.
9.
Call PS Measure Adjustment Point with the following parameters:
•
Channel = ps/+6V
•
Reference Value—Supplied from the DMM measurement in step 7
Repeat steps 5 through 8 for each adjustment point on this channel.
10. Disconnect all connections and connect Channel +25 V to Volts HI, and Common Floating
GND to Volts LO as shown in Figure 36. Connect GND and Common Floating GND with
a jumper.
Figure 36. Cable Connections For +25 V Voltage Programming and Measurement
Accuracy Adjustment
HI
1kV
MAX 1kV
MAX
INPUT
LO
3A, 250V AMPS
MAX
HI
300V
MAX
3
LO
500V MAX
1
2
HI
1kV
MAX 1kV
MAX
INPUT
LO
3A, 250V AMPS
MAX
HI
300V
MAX
3
LO
500V MAX
1
VirtualBench DC Power Supply
2
DMM
3
Cabling Wire
11. Repeat steps 4 through 9 for the ps/+25V channel.
NI VirtualBench Calibration Procedure
|
© National Instruments
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67
12. Disconnect all connections and connect Channel -25 V to Volts HI, and Common Floating
GND to Volts LO as shown in Figure 37. Connect GND and Common Floating GND with
a jumper.
Figure 37. Cable Connections For -25 V Voltage Programming and
Measurement Accuracy Adjustment
HI
1kV
MAX 1kV
MAX
INPUT
LO
3A, 250V AMPS
MAX
HI
300V
MAX
3
LO
500V MAX
1
2
HI
1kV
MAX 1kV
MAX
INPUT
LO
3A, 250V AMPS
MAX
HI
300V
MAX
3
LO
500V MAX
1
VirtualBench DC Power Supply
2
DMM
3
13. Repeat steps 4 through 9 for the ps/-25V channel.
14. Call PS Close Calibration with the following parameter:
•
Action = Commit
15. Disconnect all connections.
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NI VirtualBench Calibration Procedure
Cabling Wire
Adjusting Current Programming and Measurement Accuracy
Complete the following steps to adjust voltage programming and measurement accuracy of
VirtualBench.
1.
Reset the DMM.
2.
Call PS Initialize Calibration with the following parameters:
3.
•
Cal Type = Current
•
Password = NI (default)
Connect Channel +6 V to Amps HI, and GND to Amps LO as shown in Figure 38.
Figure 38. Cable Connections For +6 V Current Programming and
Measurement Accuracy Adjustment
HI
1kV
MAX 1kV
MAX
INPUT
LO
3A, 250V AMPS
MAX
HI
300V
MAX
3
LO
500V MAX
1
2
HI
1kV
MAX 1kV
MAX
INPUT
LO
3A, 250V AMPS
MAX
HI
300V
MAX
3
LO
500V MAX
1
VirtualBench DC Power Supply
2
DMM
NI VirtualBench Calibration Procedure
3
|
Cabling Wire
© National Instruments
|
69
4.
Call PS Get Adjustment Points with the following parameter:
•
Channel = ps/+6V
This will return an array:
•
5.
Adjustment Points—An array of current points used in the adjustment steps
Call PS Set Adjustment Point with the following parameters:
•
Channel = ps/+6V
•
Adjustment Point—Supplied from the output of PS Get Adjustment Points
6.
Wait for the DC power supply to settle. The VB-8012 requires at least 60 seconds of settling
time. The VB-8034/8054 requires at least 5 seconds of settling time.
7.
Measure the output current with the DMM.
8.
Call PS Measure Adjustment Point with the following parameters:
9.
70
•
Channel = ps/+6V
•
Reference Value—Supplied from the DMM measurement in step 7
Repeat steps 5 through 8 for each adjustment point on this channel.
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NI VirtualBench Calibration Procedure
10. Disconnect all connections and connect Channel +25 V to Amps HI, and Common Floating
GND to Amps LO as shown in Figure 39. Connect GND and Common Floating GND with
a jumper.
Figure 39. Cable Connections For +25 V Current Programming and Measurement
Accuracy Adjustment
HI
1kV
MAX 1kV
MAX
INPUT
LO
3A, 250V AMPS
MAX
HI
300V
MAX
3
LO
500V MAX
1
2
HI
1kV
MAX 1kV
MAX
INPUT
LO
3A, 250V AMPS
MAX
HI
300V
MAX
3
LO
500V MAX
1
VirtualBench DC Power Supply
2
DMM
3
Cabling Wire
11. Repeat steps 4 through 9 for the ps/+25V channel.
NI VirtualBench Calibration Procedure
|
© National Instruments
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71
12. Disconnect all connections and connect Channel -25 V to Amps LO, and Common Floating
GND to Amps HI as shown in Figure 40. Connect GND and Common Floating GND with
a jumper.
Figure 40. Cable Connections For -25 V Current Programming and Measurement Accuracy
Adjustment
HI
1kV
MAX 1kV
MAX
INPUT
LO
3A, 250V AMPS
MAX
HI
300V
MAX
3
LO
500V MAX
1
2
HI
1kV
MAX 1kV
MAX
INPUT
LO
3A, 250V AMPS
MAX
HI
300V
MAX
3
LO
500V MAX
1
VirtualBench DC Power Supply
2
DMM
3
13. Repeat steps 4 through 9 for the ps/-25V channel.
14. Call PS Close Calibration with the following parameter:
•
Action = Commit
15. Disconnect all connections.
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NI VirtualBench Calibration Procedure
Cabling Wire
DC Power Supply EEPROM Update
When an adjustment procedure for the DC power supply is completed, the VirtualBench internal
calibration memory (EEPROM) is immediately updated.
If you do not want to perform an adjustment, you can update the calibration date and onboard
calibration temperature without making any adjustments by calling Cal Set Calibration
Information.
DC Power Supply Re-Verification
Repeat the DC Power Supply Verification section to determine the As-Left status of the
instrument. Use the values in the 24 Hour Limits column of Tables 20 through 23 for a
post-adjustment verification.
If any test fails Re-Verification after performing an adjustment, verify that
you have met the DC Power Supply Test Conditions before returning your device to
NI. Refer to Where to Go for Support for assistance in returning the device to NI.
Note
Where to Go for Support
The National Instruments website is your complete resource for technical support. At ni.com/
support you have access to everything from troubleshooting and application development
self-help resources to email and phone assistance from NI Application Engineers.
Visit ni.com/services for NI Factory Installation Services, repairs, extended warranty, and
other services.
Visit ni.com/register to register your National Instruments product. Product registration
facilitates technical support and ensures that you receive important information updates from NI.
National Instruments corporate headquarters is located at 11500 North Mopac Expressway,
Austin, Texas, 78759-3504. National Instruments also has offices located around the world. For
telephone support in the United States, create your service request at ni.com/support or dial
1 866 ASK MYNI (275 6964). For telephone support outside the United States, visit the
Worldwide Offices section of ni.com/niglobal to access the branch office websites, which
provide up-to-date contact information, support phone numbers, email addresses, and current
events.
Refer to the NI Trademarks and Logo Guidelines at ni.com/trademarks for more information on National Instruments trademarks. Other
product and company names mentioned herein are trademarks or trade names of their respective companies. For patents covering National
Instruments products/technology, refer to the appropriate location: Help»Patents in your software, the patents.txt file on your media, or the
National Instruments Patents Notice at ni.com/patents. You can find information about end-user license agreements (EULAs) and third-party
legal notices in the readme file for your NI product. Refer to the Export Compliance Information at ni.com/legal/export-compliance
for the National Instruments global trade compliance policy and how to obtain relevant HTS codes, ECCNs, and other import/export data. NI MAKES
NO EXPRESS OR IMPLIED WARRANTIES AS TO THE ACCURACY OF THE INFORMATION CONTAINED HEREIN AND SHALL NOT BE LIABLE FOR
ANY ERRORS. U.S. Government Customers: The data contained in this manual was developed at private expense and is subject to the applicable
limited rights and restricted data rights as set forth in FAR 52.227-14, DFAR 252.227-7014, and DFAR 252.227-7015.
© 2015–2017 National Instruments. All rights reserved.
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