Keithley DMM7510 Calibration Manual
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Keithley DMM7510 Calibration Manual

7 1/2 digit graphical sampling multimeter
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Download this manual See also: User Manual, Calibration Manual
www.tek.com/keithley
Model DMM7510
7½ Digit Graphical Sampling Multimeter
Calibration and Adjustment Manual
DMM7510-905-01 Rev. B / February 2016
*PDMM7510-905-01B*
DMM7510-905-01B
A Greater M easure of Confidence
A T ektr onix Company

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  • Page 1 Model DMM7510 7½ Digit Graphical Sampling Multimeter Calibration and Adjustment Manual DMM7510-905-01 Rev. B / February 2016 *PDMM7510-905-01B* DMM7510-905-01B A Greater M easure of Confidence A T ektr onix Company...
  • Page 2 , and TSP-Net are trademarks of Keithley Instruments. All Keithley Instruments product names are trademarks or registered trademarks of Keithley Instruments. Other brand names are trademarks or registered trademarks of their respective holders. The Lua 5.0 software and associated documentation files are copyright © 1994-2008, Tecgraf, PUC-Rio.

  • Page 3: Safety Precautions

    Keithley Instruments products are designed for use with electrical signals that are measurement, control, and data I/O connections, with low transient overvoltages, and must not be directly connected to mains voltage or to voltage sources with high transient overvoltages.
  • Page 4 (note that selected parts should be purchased only through Keithley Instruments to maintain accuracy and functionality of the product). If you are unsure about the applicability of a replacement component, call a Keithley Instruments office for information.

  • Page 5: Table Of Contents

    Table of Contents Introduction ....................... 1-1 Welcome ..........................1-1 Introduction to this manual ....................1-1 Extended warranty ....................... 1-2 Contact information ......................1-2 Performance verification ..................2-1 Introduction .......................... 2-1 Factory service ........................2-2 Verification test requirements ....................2-2 Environmental conditions ......................2-2 Warmup period ..........................
  • Page 6 Table of Contents Model DMM7510 Error! No text of specified style in document. Calibration and Adjustment Manual Temperature and relative humidity .................... 3-2 Line power..........................3-2 Warmup period ........................3-2 Adjustment overview ......................3-2 Recommended test equipment .................... 3-3 General adjustment considerations ..................3-4 Initial instrument setup ......................

  • Page 7: Introduction

    This manual provides instructions to help you calibrate and adjust your Keithley Instruments Model DMM7510. In this manual, the term "calibration" refers to the process of verifying that the accuracy of the instrument is within its one-year accuracy specifications. The term "adjustment" refers to the process of changing the calibration constants so that the accuracy of the instrument is within its one-year accuracy specifications.

  • Page 8: Extended Warranty

    If you have any questions after you review the information in this documentation, please contact your local Keithley Instruments office, sales partner, or distributor. You can also call the corporate headquarters of Keithley Instruments (toll-free inside the U.S. and Canada only) at 1-800-935-5595, or from outside the U.S.

  • Page 9: Performance Verification

    Rear-panel verification ............2-47 Introduction Use the procedures in this section to verify that Model DMM7510 accuracy is within the limits stated in the instrument’s one-year accuracy specifications. Specifications and characteristics are subject to change without notice; refer to the Downloads, Manuals, and Documentation web page (http://www.tek.com/downloads) for the most recent specifications.

  • Page 10: Factory Service

    Also, allow the test equipment to warm up for the amount of time recommended by the manufacturer. Line power The Model DMM7510 requires a line voltage of 100 V to 240 V and a line frequency of 50 Hz or 60 Hz. Calibration verification tests should be performed within this range.

  • Page 11: Recommended Test Equipment

    Model DMM7510 Calibration and Adjustment Manual Section 2: Performance verification Recommended test equipment The following table summarizes the recommended calibration verification equipment. You can use alternate equipment if that equipment has specifications that meet or exceed those listed in the table below.

  • Page 12: Autocalibration

    DMM as a result of temperature and time. Autocalibration improves short-term accuracy of the Model DMM7510. However, you must still perform regular full calibration adjustment with metrology equipment to maintain overall accuracy. To maintain accuracy, run autocalibration when the instrument temperature changes by more than ±5 °C or one week has...

  • Page 13: Scheduling Autocalibration

    You can set up your instrument to run autocalibration automatically. You can also set up the instrument to prompt you to run autocalibration at regular intervals. To determine the best schedule for your application, see the Model DMM7510 specifications for detail on the accuracy with and without autocalibration.

  • Page 14: Reviewing Calibration Information

    Section 2: Performance verification Model DMM7510 Calibration and Adjustment Manual From the front panel: 1. Press the MENU key. 2. Under System, select Calibration. 3. Select Scheduling Action. To have the instrument:  Prompt you to run autocalibration: Select Notify.

  • Page 15: Calibration Verification Limits

    Example reading limit calculation Assume you are testing the 10 VDC range using a 10 V input value. Using the Model DMM7510 one-year accuracy specification for 10 VDC of ± (14 ppm of reading + 1.2 ppm of range), the calculated limits are: Reading limits = 10 V ±...

  • Page 16: Calculating Resistance Reading Limits

    For example, assume that you are testing the 10 kΩ range using an actual 10.03 kΩ calibration resistance value. Using Model DMM7510 one-year 10 kΩ range accuracy of ± (30 ppm of reading + 3 ppm of range), the calculated reading limits are: Reading limits = 10.03 kΩ...

  • Page 17: Test Considerations

    Model DMM7510 Calibration and Adjustment Manual Section 2: Performance verification If the Model DMM7510 is not within specifications and is not under warranty, see the adjustment procedures in Adjustment (on page 3-1) for information about adjusting the instrument. Test considerations When performing the calibration verification procedures: •...
  • Page 18 Connect the shield to the output LO terminal of the calibrator. To verify DC voltage accuracy: 1. Use a low-thermal cable to connect the Model DMM7510 HI and LO INPUT terminals to the calibrator HI and LO terminals as shown in the following figure.
  • Page 19 Verify the DC voltage 100 mV range (on page 2-11). 14. Select each range on the Model DMM7510, allow for proper settling, and verify the remaining ranges according to the following tables. Verify the DC voltage 100 mV range...

  • Page 20: Ac Voltage Verification

    • For the 700 V range, connect the Fluke 5725A Amplifier to the calibrator. Apply accurate voltages from the calibrator terminals to the terminals on the front panel of the Model DMM7510. • Verify that the displayed readings are within specified limits.
  • Page 21 Section 2: Performance verification To verify AC voltage accuracy: 1. Connect the Model DMM7510 HI and LO INPUT connectors to the calibrator as shown in the following figure. Figure 2: Connections for AC voltage verification 100 mV to 100 V ranges 2.
  • Page 22 Section 2: Performance verification Model DMM7510 Calibration and Adjustment Manual Verify the AC voltage 1 V range Input Frequency Lower limit Upper limit 3.0E+01 9.991000E-01 1.000900E+00 1.0E+03 9.991000E-01 1.000900E+00 5.0E+04 9.981000E-01 1.001900E+00 1.0E+05 9.932000E-01 1.006800E+00 Verify the AC voltage 10 V range...
  • Page 23 To verify AC voltage accuracy for the 700 V range: 1. Put the calibrator in Standby. 2. Connect the Model DMM7510 HI and LO INPUT connectors to the calibrator as shown in the following figure. 3. For 700 V at 50 kHz and 100 kHz outputs, connect the calibrator to the Fluke 5725A amplifier.

  • Page 24: Digitize Voltage Verification

    Section 2: Performance verification Model DMM7510 Calibration and Adjustment Manual 4. On the Model DMM7510, press the FUNCTION key and select AC voltage. 5. On the Home screen, select the button next to Range and select 700 V. 6. Press the MENU key.
  • Page 25 Connect the shield to the output LO terminal of the calibrator. To verify digitize voltage accuracy: 1. Connect the Model DMM7510 HI and LO INPUT connectors to the calibrator as shown in the following figure.
  • Page 26 Section 2: Performance verification Model DMM7510 Calibration and Adjustment Manual Verify the digitize voltage 100 mV range Description Input Lower limit Upper limit Perform relative offset Full scale (+) 9.99680E-02 1.00032E-01 Half scale (+) 0.05 4.99790E-02 5.00210E-02 Half scale (–) -0.05...

  • Page 27: Frequency Verification

    2. Set the function generator output impedance to High, amplitude of 5 V , waveform to square wave. 3. Enable the output. 4. On the Model DMM7510, press the FUNCTION key, select the Measure Functions tab, and select Frequency. 5. Select the MENU key. 6. Select Settings.

  • Page 28: Simulated Thermocouple Type J Temperature Verification

    Model DMM7510 specifications. To verify the simulated thermocouple Type J temperature: 1. Connect the Model DMM7510 HI and LO INPUT terminals to the calibrator HI and LO terminals as shown in the following figure.
  • Page 29 13. Allow five minutes for settling of the thermal voltage. 14. Record the measured offset voltage to 1 µV precision. If necessary, use the Model DMM7510 filter settings to reduce the noise of this measurement (for filter settings, go to MENU > Measure Calculations).

  • Page 30: Simulated Rtd Temperature Verification

    20. Verify that the Model DMM7510 reading is within lower and upper limits. 21. Repeat steps 17 and 18 for each value in the following table. Use the following values to verify the performance of the Model DMM7510. Actual values depend on published specifications (see Example reading limit calculation (on page 2-7)).
  • Page 31 DMM7510. Actual values depend on the published specifications (see Example reading limit calculation (on page 2-7)). To verify RTD accuracy: 1. For 4-wire accuracy, connect the Model DMM7510 INPUT and SENSE terminals to the calibrator as shown in the following figure. DMM7510-905-01 Rev. B / February 2016 2-23...
  • Page 32 Model DMM7510 Calibration and Adjustment Manual Figure 7: Connections for 4-wire RTD accuracy verification 2. For 3-wire accuracy, connect the Model DMM7510 INPUT and SENSE terminals to the calibrator as shown in the following figure. The SENSE HI wire is not required for 3-wire RTD measurements. For 3-wire RTD, accuracy is for <...
  • Page 33 Model DMM7510 Calibration and Adjustment Manual Section 2: Performance verification 3. On the Model DMM7510, press the FUNCTION key and select Temperature. 4. Press the MENU key. 5. Select Settings. 6. Select Transducer. 7. Set the Type to either 4-wire RTD or 3-Wire RTD.

  • Page 34: Resistance Verification

    Section 2: Performance verification Model DMM7510 Calibration and Adjustment Manual Resistance verification Use the following information to verify the performance of the Model DMM7510 resistance functions. Dry circuit resistance verification To verify the dry circuit resistance function, you will: •...
  • Page 35 DMM7510. Actual values depend on the published specifications (see Example reading limit calculation (on page 2-7)). To verify dry circuit resistance accuracy: 1. Connect the Model DMM7510 INPUT and SENSE terminals to the calibrator as shown in the following figure. DMM7510-905-01 Rev. B / February 2016 2-27...
  • Page 36 9. For the 10 kΩ range, verify with 1.9 kΩ. Overrange is 2.4 kΩ for the 10 kΩ range. 10. Select each range on the Model DMM7510, allow for proper settling, and verify the remaining ranges according to the following tables.
  • Page 37 Model DMM7510 Calibration and Adjustment Manual Section 2: Performance verification Range Nominal calibrator Actual calibrator Lower limit Upper limit (Ω) (Ω) value value (Ω) (Ω) –8.00E-03 8.00E-03 100.0000 9.9996340E01 9.997934E+01 1.000133E+02 1000 –8.00E-02 8.00E-02 1000.000 9.9998410E+02 9.997241E+02 1.000244E+03 1.0E+04 –8.00E-01 8.00E-01...
  • Page 38 Model DMM7510 Calibration and Adjustment Manual Verify 4-wire resistance accuracy To verify 4-wire resistance accuracy: 1. Connect the Model DMM7510 INPUT and SENSE terminals to the calibrator as shown in the following figure. Figure 12: Connections for 4-wire resistance accuracy verification 2.
  • Page 39 Model DMM7510 Calibration and Adjustment Manual Section 2: Performance verification You can use either the front-panel controls or remote interface commands to set measurement parameters for verification. For calibration, you must use remote interface commands. The example below is an example of remote interface commands that will generate event messages.
  • Page 40 Verify that the displayed readings are within specified limits. Verify resistance 100 MΩ range To verify the 100 MΩ range: 1. Connect the Model DMM7510 INPUT to the calibrator as shown in the following figure. Figure 13: Connections for 100 MΩ verification 2-32...
  • Page 41 Verify resistance 909 MΩ on the 1 GΩ range To verify resistance on the 1 GΩ range: 1. Connect the Model DMM7510 INPUT to the discrete shielded 909 MΩ reference resistor. Figure 14: Connections for 1 GΩ range resistance verification 2.

  • Page 42: Dc Current Verification

    To prepare the Model DMM7510 for DC current accuracy verification: 1. Set up the Model DMM7510 for DC current and the range being tested. Make sure relative offset is disabled. 2. Connect the calibrator, Model DMM7510, and reference DMM as shown in the following figure.
  • Page 43 Model 8508A 200 µA range to verify the Model DMM7510 10 µA and 100 µA ranges. Use the Model 8508A 2 mA, 20 mA, and 200 mA ranges to verify the Model DMM7510 1 mA, 10 mA, and 100 mA ranges, respectively.
  • Page 44 Section 2: Performance verification Model DMM7510 Calibration and Adjustment Manual Test limit calculation for 10 µA to 100 mA ranges The following tables list nominal test current for 10 µA to 100 mA ranges. Test limits must be calculated relative to actual current, as determined by the reference digital multimeter (DMM) measurement.
  • Page 45 Verify that the displayed readings are within specified limits. To verify DC current accuracy: 1. Set up the Model DMM7510 for DC current and the range being tested. Make sure relative offset is disabled. 2. Connect the Model DMM7510 and calibrator as shown in the following figure.
  • Page 46 Section 2: Performance verification Model DMM7510 Calibration and Adjustment Manual Verify DC current 100 mA range Description Calibrator Lower limit Upper limit setpoint (A) UUT zero STANDBY Full scale (+) 9.9982000E-02 1.0001800E-01 Half scale (+) 0.05 4.9989500E-02 5.0010500E-02 Half scale (–) –0.05...

  • Page 47: Digitize Current Verification

    Model DMM7510 Calibration and Adjustment Manual Section 2: Performance verification Digitize current verification The following topics describe how to verify digitized DC current on the Model DMM7510. Digitize DC current verification 10 µA to 3 A ranges To verify digitize DC current accuracy: 1.
  • Page 48 Section 2: Performance verification Model DMM7510 Calibration and Adjustment Manual Verify digitize current 10 µA range Description Calibrator setpoint Lower limit Upper limit UUT zero Full scale (+) 0.000010 9.99765E-06 1.00024E-05 Half scale (+) 0.000005 4.99845E-06 5.00155E-06 Half scale (–) –0.000005...

  • Page 49: Ac Current Verification

    DMM7510 front-panel terminals. • Verify that the displayed readings fall within specified limits. Use the values in the following tables to verify the performance of the Model DMM7510. Actual values depend on the published specifications (see Example reading limit calculation (on page 2-7)).
  • Page 50 Section 2: Performance verification Model DMM7510 Calibration and Adjustment Manual 7. Connect the Model DMM7510 to the calibrator as shown in the following figure. Figure 18: Connections for AC current verification 8. Source AC current for each of the frequencies listed in the following tables.

  • Page 51: Capacitance Verification

    To compensate for capacitance offset of the cable and 1 µF thru 100 µF decade box: 1. Connect the Model DMM7510, shielded banana cable, banana to dual BNC cable, and 1 µF through 100 µF decade capacitor box as shown in the following diagram.
  • Page 52 Section 2: Performance verification Model DMM7510 Calibration and Adjustment Manual 2. Set the decade capacitor box to 0 F. 3. On the Model DMM7510, press the FUNCTION key, select the Measure Functions tab, and select Capacitance. 4. Press the MENU key.

  • Page 53: Verifying Zero Values Using A 4-Wire Short

    Four-wire short verifications are not included in the Customer Calibration Data Report. To verify zero values using a 4-wire short, you will: • Check the zero values of various test points with 4-wire connections to the Model DMM7510 front or rear terminals. •...
  • Page 54 Section 2: Performance verification Model DMM7510 Calibration and Adjustment Manual Figure 21: Front panel 4-wire shorting plug orientation 8. Verify that the 1 Ω range is within specification (see the following table). 9. Repeat verification for the 10 Ω to 100 kΩ ranges.

  • Page 55: Rear-Panel Verification

    3. Press the HOME key. 4. Set the range to 10A. 5. Connect Model DMM7510, reference DMM, calibrator, and amplifier as shown in the following figure. Ensure cabling is designed to conduct 10 A without significant voltage drop. In general, cables for the 10 A range steps should be made of heavy guage wire and should be as short as practical.
  • Page 56 Section 2: Performance verification Model DMM7510 Calibration and Adjustment Manual Figure 22: Connections for DC current verification 10 A range 2-48 DMM7510-905-01 Rev. B / February 2016...
  • Page 57 5. On the reference DMM, select DCA, 20A range. 6. On the 20 A range, apply the reference DMM offsets using Zero Range. 7. On the Model DMM7510, apply the system offsets. 8. Verify the DC current verification points and reference DMM readings from the following table.

  • Page 58: Digitize Current 10 A Range Verification

    10 A range steps should be made of heavy guage wire and should be as short as practical. To verify the 10 A range: 1. Connect Model DMM7510, calibrator, and amplifier as shown in the following figure. Figure 23: Connections for the 10 A range Ensure cabling is designed to conduct 10 A without significant voltage drop.

  • Page 59: Ac Current 10 A Verification

    Verify the Model DMM7510 zero: 1. On the calibrator, select the OPR/STBY key. Ensure that the front panel displays STANDBY. 2. Verify the Model DMM7510 zero reading for each range. Apply a relative offset to the system: 1. On the calibrator, select the OPR/STBY key. Ensure that the front panel displays OPERATE.
  • Page 60 To verify frequencies 1 kHz and higher, set the detector bandwidth to 300 Hz for faster ≈ 55 readings/s throughput. 8. Connect the Model DMM7510 to the calibrator and amplifier as shown in the following figure. Ensure cabling is designed to conduct 10 A without significant voltage drop. In general, cables for the 10 A range steps should be made of heavy guage wire and should be as short as practical.
  • Page 61 Model DMM7510 Calibration and Adjustment Manual Section 2: Performance verification Verify AC current 10 A range Description Verification point Lower limit Upper limit 40 Hz 10.000 9.955000E+00 1.004500E+01 1 kHz 10.000 9.955000E+00 1.004500E+01 5 kHz 10.000 9.907000E+00 1.009300E+01 DMM7510-905-01 Rev. B / February 2016...

  • Page 62: Adjustment

    Use the procedures in this section to adjust the Model DMM7510 calibration. Model DMM7510 performance is specified for a period of 90 days, 1 year, or 2 years from adjustment. Adjustment should be performed at one of these intervals, depending on your specification requirements.

  • Page 63: Environmental Conditions

    No direct airflow on the input terminals. Line power The Model DMM7510 requires a line voltage of 100 V to 240 V and a line frequency of 50 Hz or 60 Hz. The instrument must be adjusted within this range.

  • Page 64: Recommended Test Equipment

    Model DMM7510 Calibration and Adjustment Manual Section 3: Adjustment During adjustment, the Model DMM7510 calibrates its internal references to external standards. All DC and digitize voltage and current (below the 10 A range), and all resistance adjustments are derived from measurements of four standard reference signals: •...

  • Page 65: General Adjustment Considerations

    Calibration steps are performed on both rear and front inputs as described in sections below, except for Model DMM7510-NFP (no front panel; all adjustment steps use rear inputs). Be sure that the Front/Rear switch is in the proper position before sending adjustment commands.

  • Page 66: Select The Correct Terminals

    Section 3: Adjustment Select the correct terminals On the Model DMM7510, you must adjust calibration from both the front and rear terminals. You can verify calibration on either the front or rear terminals. To set the instrument to the rear-panel terminals, press the FRONT/REAR TERMINALS switch on the front panel of the instrument until R is lit next to the switch.

  • Page 67: Unlock Calibration

    Example calibration adjustment code that provides additional front-panel display prompts is provided Example calibration adjustment code (on page 3-23). Rear-terminal adjustment steps Follow the steps described in this section to adjust the Model DMM7510 using the rear terminals. Summary of rear-terminal adjustment steps: • Prepare the Model DMM7510 for rear-terminal adjustment •...
  • Page 68 To prepare the Model DMM7510 for rear-terminal adjustment: 1. Set the TERMINALS switch to REAR. Ensure that the orange R is displayed. 2. Install the Keithley Model 8610 or 8620 shorting plug on the rear terminals of the Model DMM7510 as shown in the figure below.
  • Page 69 1. Remove the 4-wire short from the inputs. Cables cannot be attached to the Model DMM7510 during this step. At the beginning of this step, the HI and LO terminals are measured for applied voltage detection. If detected, the step will terminate, generating a warning message.
  • Page 70 Rear AC adjustment step 2: ACI 10 A full-scale adjustment To run rear AC adjustment step 2: 1. Connect the calibrator, amplifier, and Model DMM7510 as shown in the following figure. Ensure cabling is designed to conduct 10 A without significant voltage drop. In general, cables for the 10 A range steps should be made of heavy guage wire and should be as short as practical.
  • Page 71 Section 3: Adjustment Model DMM7510 Calibration and Adjustment Manual Figure 28: Connections for the 10 A range 2. On the calibrator, set the level to 7 A at 1 kHz. Calibration adjustment step 2 allows 2 A through 10 A, ±10 % for the source level. It is best to use 7 A for lowest full-scale uncertainty and minimize internal thermal settling.

  • Page 72: Front-Terminal Adjustment Steps

    Model DMM7510 Calibration and Adjustment Manual Section 3: Adjustment Front-terminal adjustment steps Follow the steps described in this section to adjust the Model DMM7510 using the terminals on the Model DMM7510 front panel. Summary of front-terminal adjustment steps: • DC adjustment (cal.adjust.dc()) •...
  • Page 73 To prepare the Model DMM7510 for DCV adjustment steps 0 to 2: 1. Set the TERMINALS switch to FRONT. Ensure that the green F is displayed. 2. Install the Keithley Model 8610 or 8620 shorting plug on the front terminals of the Model DMM7510 as shown in the figure below.
  • Page 74 To prepare to run DCV adjustment steps 3, 4, and 5: 1. Connect a cable between the calibrator and the Model DMM7510 as shown in the figure below. Figure 30: Connections for DC voltage accuracy adjustment steps 3 to 5 2.
  • Page 75 Prepare the Model DMM7510 for ACV adjustment steps 1 to 10 To prepare to run AC adjustment steps 1 to 10: 1. Connect a cable between the calibrator and the Model DMM7510 as shown in the figure below (if not already connected from previous steps).
  • Page 76 Model DMM7510 Calibration and Adjustment Manual Section 3: Adjustment 2. Allow the instrument and cables to settle for 30 seconds. 3. On the calibrator, source 10 mV 1.0 kHz. 4. Enable the OPR key. For cal.ac.adjust steps 1 to 16, the identified source values are required. If alternate values are used, incorrect accuracies will occur and you may get out-of-tolerance warning messages.
  • Page 77 Section 3: Adjustment Model DMM7510 Calibration and Adjustment Manual AC voltage adjustment step 6: 10 V at 1.0 kHz To run ACV adjustment step 6: 1. On the calibrator, source 10 V at 1 kHz. 2. Allow the calibrator and cable to settle properly.
  • Page 78 Prepare the Model DMM7510 for ACI adjustment steps 11 to 16 To prepare the Model DMM7510 for ACI adjustment steps 11 to 16: Connect the Model DMM7510 to the calibrator as shown in the following figure. Figure 32: Connections for AC current verification AC current adjustment step 11: 100 µA at 1 kHz...
  • Page 79 Prepare the Model DMM7510 for AC coupling adjustment step 17 To prepare for AC coupling adjustment step 17: 1. Connect a cable between the calibrator and the Model DMM7510 as shown in the figure below. Figure 33: AC coupling verification connections 3-18 DMM7510-905-01 Rev.
  • Page 80 Prepare the Model DMM7510 for AC frequency adjustment step 18 To prepare the Model DMM7510 for ACI adjustment step 8: 1. Connect the Keithley Instruments Model 3390 function generator to the Model DMM7510 INPUT HI and LO terminals as shown in the following figure.

  • Page 81: Save Calibration And Set The Adjustment Dates

    Adjustment command timing and error checking Before each adjustment step, the input of the Model DMM7510 must be connected to an appropriate reference signal, as documented in Remote calibration adjustment procedures (on page 3-6).
  • Page 82 To enable prompts mode, send the localnode.prompts = 1 command. This causes the Model DMM7510 to return a TSP> prompt to the computer screen when it has completed a step and is ready for the next command. Prompts mode also returns a TSP? prompt if an event message is available (for example, if an error occurs during an adjustment step).
  • Page 83 Because bit value 16 of the status byte signals "Message Available" (MAV), a program can periodically poll the Model DMM7510 status and wait for the MAV bit to be set before reading the Done with step... message. Handling events If an error occurs while performing a calibration adjustment step, the Model DMM7510 displays an error message on the front panel.

  • Page 84: Example Calibration Adjustment Code

    Visual Studio VB.net, using National Instruments VISA (NI-VISA Namespace MessageBasedSession to communicate with the Model DMM7510. This code only illustrates techniques for controlling adjustment command timing and checking for adjustment errors. It does not include any code for controlling a calibrator source (which is needed for most adjustment steps), and it contains no provisions to handle program exceptions such as communication timeout.
  • Page 85 ' Read "Done with step 2" message. Console.WriteLine(DMM7510.ReadString()) If CheckForErrors(DMM7510) Then GoTo CleanUp ' Perform all remaining adjustment steps ' DMM7510.Write("cal.save()") ' cal.save() is required at completion of ' successful cal adjust, but do not save while experimenting with ' this example. CleanUp: DMM7510.Write("cal.lock()")

  • Page 86: Tsp Command Reference

    TSP command reference In this section: TSP commands ................ 4-1 TSP commands Introduction This section contains detailed information on the Model DMM7510 remote calibration commands. acal.count This attribute returns the number of times autocalibration has been run. Type TSP-Link accessible...

  • Page 87: Acal.lastrun.internaltemp

    Section 4: TSP command reference Model DMM7510 Calibration and Adjustment Manual acal.lastrun.internaltemp This attribute returns the internal temperature of the instrument when autocalibration was run. Type TSP-Link accessible Affected by Where saved Default value Attribute (R) Not applicable Nonvolatile memory...

  • Page 88: Acal.lastrun.tempdiff

    Model DMM7510 Calibration and Adjustment Manual Section 4: TSP command reference acal.lastrun.tempdiff This attribute returns the difference between the internal temperature and the temperature when autocalibration was last run. Type TSP-Link accessible Affected by Where saved Default value Attribute (R)

  • Page 89: Acal.lastrun.time

    Section 4: TSP command reference Model DMM7510 Calibration and Adjustment Manual acal.lastrun.time This attribute returns the date and time when autocalibration was last run. Type TSP-Link accessible Affected by Where saved Default value Attribute (R) Not applicable Nonvolatile memory Not applicable Usage dateTime = acal.lastrun.time...

  • Page 90: Acal.nextrun.time

    Model DMM7510 Calibration and Adjustment Manual Section 4: TSP command reference acal.nextrun.time This attribute returns the date and time when the next autocalibration is scheduled to be run. Type TSP-Link accessible Affected by Where saved Default value Attribute (R) Not applicable...

  • Page 91: Acal.revert()

    Section 4: TSP command reference Model DMM7510 Calibration and Adjustment Manual acal.revert() This function returns autocalibration constants to the previous constants. Type TSP-Link accessible Affected by Where saved Default value Function Usage acal.revert() Details This command reverts the present set of autocalibration constants to the previous set of autocalibration constants.

  • Page 92: Acal.schedule()

    Model DMM7510 Calibration and Adjustment Manual Section 4: TSP command reference Example acal.run() Autocalibration starts running. When it is complete, an information message is generated in the event log. Also see acal.schedule() (on page 4-7) Autocalibration (on page 2-4) acal.schedule() This function sets how often autocalibration occurs or prompts you to run it.
  • Page 93 Section 4: TSP command reference Model DMM7510 Calibration and Adjustment Manual Details Autocalibration does not start until all actions that are active on the instrument are complete. When the scheduled time occurs, the autocalibration run command is placed in the command queue and will be executed after any previously sent commands or actions have executed.

  • Page 94: Cal.adjust.ac()

    ACV step 18, 1 V 1 kHz, squarewave, frequency adjustment (10 seconds) For detail on how to use cal.adjust.ac(), refer to the steps under: • Prepare the Model DMM7510 for ACV adjustment steps 1 to 10 (on page 3-14) •...

  • Page 95: Cal.adjust.count

    Section 4: TSP command reference Model DMM7510 Calibration and Adjustment Manual This command generates an error if: • Calibration is locked • The step is out of sequence • The step does not complete successfully • The value that is passed is invalid for the step, out of range, or not needed Also see cal.adjust.dc()

  • Page 96: Cal.adjust.date

    Model DMM7510 Calibration and Adjustment Manual Section 4: TSP command reference cal.adjust.date This attribute contains the date when the instrument was last adjusted. Type TSP-Link accessible Affected by Where saved Default value Attribute (RW) Not applicable Nonvolatile memory Not applicable Usage adjustDate = cal.adjust.date...

  • Page 97: Cal.adjust.dc()

    Section 4: TSP command reference Model DMM7510 Calibration and Adjustment Manual cal.adjust.dc() This function starts the specified DC adjustment step. Type TSP-Link accessible Affected by Where saved Default value Function Usage cal.adjust.dc(step) cal.adjust.dc(step, value) step The DC adjustment step to start...

  • Page 98: Cal.adjust.internaltemp

    Model DMM7510 Calibration and Adjustment Manual Section 4: TSP command reference cal.adjust.internaltemp This attribute returns the internal temperature of the instrument when calibration was last adjusted. Type TSP-Link accessible Affected by Where saved Default value Attribute (R) Not applicable Nonvolatile memory...

  • Page 99: Cal.adjust.rear.dc()

    Section 4: TSP command reference Model DMM7510 Calibration and Adjustment Manual This command generates an error if: • Calibration is locked • The step is out of sequence • The step does not complete successfully • The value that is passed is invalid for the step, out of range, or not needed Also see cal.adjust.rear.dc()

  • Page 100: Cal.adjust.tempdiff

    Model DMM7510 Calibration and Adjustment Manual Section 4: TSP command reference This command generates an error if: • Calibration is locked • The step is out of sequence • The step does not complete successfully • The value that is passed is invalid for the step, out of range, or not needed Also see cal.adjust.rear.ac()

  • Page 101: Cal.lock()

    Section 4: TSP command reference Model DMM7510 Calibration and Adjustment Manual cal.lock() This function prevents access to instrument calibration. Type TSP-Link accessible Affected by Where saved Default value Function Usage cal.lock() Details Calibration data is locked during normal operation. To perform calibration, you must unlock calibration.

  • Page 102: Cal.password

    Model DMM7510 Calibration and Adjustment Manual Section 4: TSP command reference cal.password This attribute sets the password that you send when you unlock calibration. Type TSP-Link accessible Affected by Where saved Default value Attribute (W) Not applicable Nonvolatile memory KI000CAL Usage cal.password = password...

  • Page 103: Cal.save()

    Section 4: TSP command reference Model DMM7510 Calibration and Adjustment Manual cal.save() This function saves the calibration constants. Type TSP-Link accessible Affected by Where saved Default value Function Usage cal.save() Details This command stores the internally calculated calibration constants that were derived during the comprehensive calibration procedure.

  • Page 104: Cal.unlock()

    Model DMM7510 Calibration and Adjustment Manual Section 4: TSP command reference cal.unlock() This attribute unlocks calibration operations. Type TSP-Link accessible Affected by Where saved Default value Function Usage cal.unlock(password) password A string containing the password to unlock calibration Details Calibration data is locked during normal operation. To perform calibration, you must unlock calibration.

  • Page 105: Cal.verify.date

    Section 4: TSP command reference Model DMM7510 Calibration and Adjustment Manual cal.verify.date This attribute contains the date of the last calibration verification. Type TSP-Link accessible Affected by Where saved Default value Attribute (RW) Not applicable Nonvolatile memory Not applicable Usage verifyDate = cal.verify.date...
  • Page 106 Model DMM7510 Calibration and Adjustment Manual Section 4: TSP command reference Example 1 cal.verify.date = os.time({year=2014, month=9, day=5}) print(cal.verify.date) Set the verify calibration date to September 5, 2014. Verify the date. Example output: Sep 5 2014 12:00:00.000 Example 2 cal.verify.date = os.time() Set the calibration verification to the present date of the instrument.
  • Page 107 All other trademarks and trade names are the property of their respective companies. Keithley Instruments Corporate Headquarters • 28775 Aurora Road • Cleveland, Ohio 44139 • 440-248-0400 • Fax: 440-248-6168 • 1-800-935-5595 • www.tek.com/keithley A Gr eater M easur e of C onfi dence...

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