National Instruments VirtualBench Calibration Procedure Download Page 69

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NI VirtualBench Calibration Procedure

Adjusting Current Programming and Measurement Accuracy

Complete the following steps to adjust voltage programming and measurement accuracy of
VirtualBench.
1.

Reset the DMM.

Call

PS Initialize Calibration

with the following parameters:

•

Cal Type

Current

•

Password

(default)

Connect C6 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

VirtualBench DC Power Supply

DMM

Cabling Wire

00V

MAX

AMP

500V MAX

1kV

MAX

A, 250V

MAX

INPUT

MAX

1kV

00V

MAX

AMP

500V MAX

1kV

MAX

A, 250V

MAX

INPUT

MAX

1kV

Summary of Contents for VirtualBench

Page 1: ...erification 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 Volt...

Page 2: ...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 Ve...

Page 3: ...Specifications or NI VirtualBench VB 8054 Specifications Contains specifications and calibration interval for your VirtualBench NI VirtualBench VI Reference Help Contains LabVIEW programming concepts...

Page 4: ...ss 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 multimet...

Page 5: ...to 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 the...

Page 6: ...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 st...

Page 7: ...ibrator 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 documenta...

Page 8: ...C Volts Auto Range FALSE Manual Range 0 1 c Set the input resistance of the VirtualBench to 10 G by calling DMM Configure DC Voltage with the following parameter Input Resistance 10 GOhm d Call DMM Re...

Page 9: ...with the following parameter Input Resistance 10 GOhm 13 Call DMM Read Compare to the limits listed in Table 4 Table 4 VirtualBench DC Voltage Verification Limits Range V Verification Point V Input R...

Page 10: ...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 conne...

Page 11: ...irtualBench AC Voltage Verification Limits Range Vrms Verification Point Frequency kHz Verification Point Vrms 1 Year Limits Vrms 24 Hour Limits Vrms Lower Upper Lower Upper 0 1 1 0 006 0 005943 0 006...

Page 12: ...te Thermal EMF stabilization time is not needed if the cables have not been connected reconnected 3 Call DMM Configure Measurement with the following parameters Function Resistance Auto Range FALSE Ma...

Page 13: ...ough 11 for every range in Table 6 13 To verify resistance 19 k call DMM Configure Measurement with the following parameters Function Resistance Auto Range FALSE Manual Range 100 k 14 Set the calibrat...

Page 14: ...istance instead of absolute limits because the limits depend on the actual resistance value output by your calibrator 21 Repeat steps 18 through 20 for each verification point on that range listed in...

Page 15: ...4 Generate 0 0101 A verification point on the calibrator 5 Call DMM Configure Measurement with the following parameters Function DC Current Auto Range FALSE Manual Range 0 01 6 Call DMM Read Compare...

Page 16: ...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 connector...

Page 17: ...le 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 Table 9 VirtualBe...

Page 18: ...n point on the calibrator 5 Call DMM Configure Measurement with the following parameters Function AC Current Auto Range FALSE Manual Range 0 005 6 Call DMM Read Compare to the limits listed in Table 1...

Page 19: ...ify 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 co...

Page 20: ...procedures NI VirtualBench does not allow you to store your new calibration coefficients Instead NI VirtualBench restores the original coefficients to the EEPROM Note If verification was successful a...

Page 21: ...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 Virtu...

Page 22: ...ench 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...

Page 23: ...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 rea...

Page 24: ...ce 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 k o...

Page 25: ...DMM Initialize Calibration with the following parameter Password NI default 5 Call DMM Get Current Calibration Adjustment Points This will return two arrays Range A numerical array specifying the rang...

Page 26: ...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...

Page 27: ...ther 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 r...

Page 28: ...ent temperature Oscilloscope Initial Setup Note This section is necessary for pre adjustment verifications only If you are performing a post adjustment verification skip the setup and go directly to t...

Page 29: ...ifying the Oscilloscope Offset Complete the following steps to verify the VirtualBench oscilloscope offset Note In this procedure the 50 BNC terminator is only needed for the VB 8012 The VB 8034 and V...

Page 30: ...easurement falls within the limits in Table 13 7 Call MSO Stop 8 Repeat steps 4 to 7 for all of the ranges in Table 13 Note The 0 02 V range only applies to the VB 8034 and VB 8054 9 Call MSO Close Ta...

Page 31: ...en calling MSO Configure Analog Channel in step 4 change the Channel input to mso 2 12 VB 8012 Remove the 50 BNC terminator from channel 2 13 VB 8034 8054 Repeat steps 2 to 9 for all ranges on channel...

Page 32: ...5 Figure 15 Oscilloscope Gain Channel 1 Connection Diagram 2 Call MSO Initialize 3 Call MSO Configure Timing with the following parameters Sample Rate 1M Acquisition Time s 0 1 Pretrigger Time s 1e 9...

Page 33: ...f 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...

Page 34: ...ct VirtualBench channel 2 to the oscilloscope calibrator active head as shown in Figure 16 Figure 16 Oscilloscope Gain Channel 2 Connection Diagram 0 05 0 045 0 045 2 2 1 1 0 02 0 018 0 018 2 2 1 2 1...

Page 35: ...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 21 VB 8034 8054 Repeat s...

Page 36: ...igure 18 VB 8034 8054 Oscilloscope Gain Channel 4 Connection Diagram 23 VB 8034 8054 Repeat steps 2 to 16 for all ranges on channel 4 Note VB 8034 8054 When calling MSO Configure Analog Channel in ste...

Page 37: ...Bench channel 1 to the oscilloscope calibrator active head as shown in Figure 19 Figure 19 Oscilloscope Gain Channel 1 Connection Diagram 2 Call MSO Initialize 3 Call MSO Configure Timing with the fol...

Page 38: ...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...

Page 39: ...lue in Table 15 Note The 0 02 V vertical range only applies to the VB 8034 and VB 8054 18 Call MSO Close Table 15 Oscilloscope Offset DAC Gain Verification Limits Vertical Range V Vertical Offset V 1...

Page 40: ...hown in Figure 20 Figure 20 Oscilloscope Gain Channel 2 Connection Diagram 20 Repeat steps 2 to 18 for all ranges on channel 2 Note When calling MSO Configure Analog Channel in step 4 change the Chann...

Page 41: ...in Figure 21 Figure 21 VB 8034 8054 Oscilloscope Gain Channel 3 Connection Diagram 23 VB 8034 8054 Repeat steps 2 to 18 for all ranges on channel 3 Note VB 8034 8054 When calling MSO Configure Analog...

Page 42: ...igure 22 VB 8034 8054 Oscilloscope Gain Channel 4 Connection Diagram 25 VB 8034 8054 Repeat steps 2 to 18 for all ranges on channel 4 Note VB 8034 8054 When calling MSO Configure Analog Channel in ste...

Page 43: ...h to warm up for at least 30 minutes before adjusting To adjust the Oscilloscope accuracy perform the following steps Note In this procedure the 50 BNC terminator is only needed for the VB 8012 The VB...

Page 44: ...n Vpk pk Frequency A numerical array specifying the frequency of the calibration square wave Note Configure the function generator for high impedance loads 7 Use the function generator to generate a s...

Page 45: ...ctive head as shown in Figure 25 Figure 25 Oscilloscope Gain Channel 1 Connection Diagram 12 Call MSO Get Range Calibration Adjustment Points This will return two arrays Range A numerical array specif...

Page 46: ...ge 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...

Page 47: ...ou 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 R...

Page 48: ...ons 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 connecti...

Page 49: ...elf calibration is performed Note 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 FGEN V...

Page 50: ...t 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 v...

Page 51: ...how to adjust the VirtualBench FGEN You can choose to perform these adjustment procedures with or without performing the verification procedures first Note NI recommends repeating the verification pr...

Page 52: ...s 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 Reference Value Supplied from measurem...

Page 53: ...e 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 mak...

Page 54: ...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 a...

Page 55: ...g 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 th...

Page 56: ...nge 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 3 Call PS Initialize 4 C...

Page 57: ...ut 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 Sup...

Page 58: ...tween 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 Table 21 VB 8034 8054 DC Power Supply Voltage Programming and Mea...

Page 59: ...in Figure 30 Figure 30 Cable Connections For 25 V Voltage Programming Accuracy Verification 13 Configure the DMM for the 100 V range 14 Repeat steps 4 through 11 for the ps 25V channel 1 VirtualBench...

Page 60: ...D with a jumper Figure 31 Cable Connections For 25 V Voltage Programming Accuracy Verification 16 Repeat steps 4 through 11 for the ps 25V channel 17 Disconnect all connections 18 Call PS Close 1 Virt...

Page 61: ...012 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 3 Call...

Page 62: ...y that the calculation falls between the limits in Table 22 or 23 Note Use the values in the 1 Year Limits column The values in the 24 Hour Limits column are for a post adjustment verification only Ta...

Page 63: ...int 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 Floati...

Page 64: ...ing Accuracy Verification 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 pow...

Page 65: ...cations after adjustments 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 Note Be...

Page 66: ...ts used in the adjustment steps 5 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 mil...

Page 67: ...ctions 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 Pro...

Page 68: ...Cable Connections For 25 V Voltage Programming and Measurement Accuracy Adjustment 13 Repeat steps 4 through 9 for the ps 25V channel 14 Call PS Close Calibration with the following parameter Action C...

Page 69: ...alize Calibration with the following parameters Cal Type Current Password NI default 3 Connect Channel 6 V to Amps HI and GND to Amps LO as shown in Figure 38 Figure 38 Cable Connections For 6 V Curre...

Page 70: ...el 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 requi...

Page 71: ...nect GND and Common Floating GND with a jumper Figure 39 Cable Connections For 25 V Current Programming and Measurement Accuracy Adjustment 11 Repeat steps 4 through 9 for the ps 25V channel 1 Virtual...

Page 72: ...0 CableConnectionsFor 25 VCurrentProgrammingandMeasurementAccuracy Adjustment 13 Repeat steps 4 through 9 for the ps 25V channel 14 Call PS Close Calibration with the following parameter Action Commit...

Page 73: ...d 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...

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