Keysight 3458A Calibration Manual
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Keysight 3458A Calibration Manual

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  • Page 1 Keysight 3458A Multimeter Calibration Manual...
  • Page 2 Conformity. understood and met. where in the EULA. Keysight shall be under no obligation to update, revise or otherwise modify the Software. With WARNING respect to any technical data as defined by FAR 2.101, pursuant to FAR...

  • Page 3: Keysight Technologies Warranty Statement

    3 Keysight does not warrant that the operation of Keysight products will be interrupted or error free. If Keysight is unable, within a reasonable ntime, to repair or replace any product to a condition as warranted, customer will be entitled to a refund of the purchase price upon prompt return of the product.
  • Page 4 8 Keysight will be liable for damage to tangible property per incident up to the greater of $300,000 or the actual amount paid for the product that is the subject of the claim, and for damages for bodily injury or death, to the extent that all such damages are determined by a court of competent jurisdiction to have been directly caused by a defective Keysight product.

  • Page 5: U.s. Government Restricted Rights

    1987)(or any equivalent agency regulation or contract clause), whichever is applicable. You have only those rights provided for such Software and Documentation by the applicable FAR or DFARS clause or the Keysight standard software agreement for the product involved. Keysight 3458A Calibration Manual...

  • Page 6: Safety Symbols

    Indicates the field wiring terminal that must be connected to earth ground Frame or chassis ground before operating the equipment — terminal—typically connects to the protects against electrical shock in equipment's metal frame. case of fault. Keysight 3458A Calibration Manual...

  • Page 7: Safety Considerations

    Failure to comply with these precautions or with specific warnings elsewhere in this manual violates safety standards for design, manufacture, and intended use of the instrument. Keysight Technologies assumes no liability for the customer’s failure to comply with these requirements.
  • Page 8 Return the product to Keysight for service and repair to ensure that safety features are maintained. – Measuring high voltages is al ways hazardous: ALL multimeter input terminals (both front and rear) must be considered hazardous whenever inputs greater than 42V (dc or peak) are connected to ANY input terminal.

  • Page 9: Waste Electrical And Electronic Equipment (Weee) Directive

    To return this unwanted instrument, contact your nearest Keysight Service Center, or visit http://about.keysight.com/en/companyinfo/environment/takeback.shtml for more information. Sales and Technical Support To contact Keysight for sales and technical support, refer to the support links on the following Keysight websites: – www.keysight.com/find/3458A (product-specific information and support, software and documentation updates) –...
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  • Page 11: Table Of Contents

    ........37 Keysight 3458A Calibration Manual...
  • Page 12 ......73 4-wire ohms function offset test (rear terminals) ....73 Keysight 3458A Calibration Manual...
  • Page 13 ...........114 Specifications Electronic Calibration of the 3458A (Product Note 3458A-3) Introduction .
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  • Page 15 .....49 Figure 4-1 General test procedure ......59 Keysight 3458A Calibration Manual...
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  • Page 17 .....70 Table 4-6 OHMF gain performance tests ....74 Keysight 3458A Calibration Manual...
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  • Page 19 Keysight 3458A Multimeter Calibration Manual 3458A Calibration Introduction Introduction Calibration Security Monitoring Calibration Constants...

  • Page 20: 3458A Calibration Introduction Introduction

    Chapter 5: Command Summary provides an alphabetical summary of commands that are used in adjusting and performance testing the 3458A. Appendix A: 3458A Technical Specifications Appendix B: Electronic Calibration of the 3458A, Product Note 3458A-3 Keysight 3458A Calibration Manual...

  • Page 21: Calibration Security

    3458A Calibration Introduction Calibration Security The calibration security feature of the 3458A allows the person responsible for calibration to enter a security code to prevent accidental or unauthorized calibration (CAL) or autocalibration (ACAL). The SECURE command is used to change the security code of the 3458A.
  • Page 22 If a new security number (new_code of SECURE command) is not entered while the jumper is in the right position the original number will again be in effect when jumper JM600 is returned to the left position. Keysight 3458A Calibration Manual...

  • Page 23: Hardware Lock-Out Of Calibration

    The multimeter was adjusted before it left the factory. This has incremented the NOTE calibration number. When you receive the multimeter, read the calibration number to determine the initial value you start with. The procedure for reading the number of calibrations is presented after this note. Keysight 3458A Calibration Manual...

  • Page 24: Monitoring For Cal Violations

    2 Remotely execute OUTPUT 722;“CALSTR 'CALNUM=270'” 3 At a later time you can verify if CAL has been violated by executing CALNUM? and CALSTR shift? to see if CALNUM is greater than that stored in CALSTR. Keysight 3458A Calibration Manual...

  • Page 25: Monitoring Calibration Constants

    (see CAL? command, cal_item parameter). This may give you an indication of the calibration cycle you want to establish for your 3458A. Information on the externally derived calibration constants and the 197 internally derived calibration constants is...
  • Page 26 ±l000 V peak ±1500 V peak I terminal to earth ground: Front terminals to rear ±1000 V peak ±1500 V peak terminals: – The multimeter will be damaged if any of the above maximum non-destructive inputs are exceeded. Keysight 3458A Calibration Manual...
  • Page 27 Keysight 3458A Multimeter Calibration Manual Operational Verification Tests Introduction Operational Tests...

  • Page 28: Operational Verification Tests Introduction

    This section contains Operational Verification Tests which provide an abbreviated method of testing the operation and accuracy of the unit. The Operational Verification Tests are designed to provide a 90% confidence that the 3458A is operational and meets the specifications listed in Appendix Operational Verification Tests perform a three point verification.

  • Page 29: Operational Tests

    Preliminary steps 1 Verify that the DC voltage/resistance standard is properly warmed up. 2 The 3458A requires a 4 hour warm-up period. If this has not occurred turn the instrument ON and allow it to warm up before proceeding. °...

  • Page 30: 2-Wire Ohms Function Offset Test

    39). 2 Verify that the Terminals switch is in the Front position. 3 Set the 3458A under test to the 10 W range (function = OHM). Allow five minutes for the range relays to thermally stabilize. 4 Execute Trig from the front panel two times and use the Operational Test Card to record the offset reading.

  • Page 31: 4-Wire Ohms Function Gain Test

    2 Set the Terminals switch of both DMMs to the Front position. 3 Set the range of the transfer standard DMM to 10 kW (function = OHMF). 4 Set the range of the 3458A under test to 10 kW (function = OHMF). 5 Set the resistance standard to 10 kW.

  • Page 32: Dc Voltage Function Gain Test

    4 Set the range of the transfer standard DMM to 10 V (function = DCV). 5 Set the range of the 3458A under test to 10 V (function = DCV). 6 Connect the DC voltage source to the transfer standard DMM.

  • Page 33: Dc Voltage Function Offset Test

    Operational Verification Tests 11 Execute Trig SGL and read the value as measured with the 3458A under test and record this value in the “Unit under test reading” column of the DC voltage operational test record. 12 Connect the DC voltage source to the transfer standard DMM.
  • Page 34 Operational Verification Tests Keysight 3458A Calibration Manual...
  • Page 35 Keysight 3458A Multimeter Calibration Manual Adjustment Procedures Introduction Required Equipment Preliminary Adjustment Procedure Front Terminal Offset Adjustment Rear Terminal Offset Adjustment DC Gain Adjustment AC Adjustment...

  • Page 36: Adjustment Procedures

    Adjustment Procedures Introduction This section contains procedures for adjusting the 3458A multimeter. The 3458A uses closed-box electronic adjustment. No potentiometers or other electro-mechanical adjustments are used and the complete adjustment is done without removing any of the multimeter's covers. Only a voltage standard. A resistance standard, a low-thermal short, and an AC signal source are needed to perform all of the adjustments.

  • Page 37: Required Equipment

    – 10 kW Resistance Standard--Fluke 742-10 K or equivalent (for the Resistance and DC Current Adjustment). – AC Source-Keysight 3325A Synthesizer/Function Generator or equivalent (for the AC adjustment). The resultant accuracy of the multimeter depends on the accuracy of the equipment used, the thermal characteristics of the short.

  • Page 38: Preliminary Adjustment Procedure

    Adjustment Procedures Preliminary Adjustment Procedure Perform the following steps prior to adjusting the 3458A: 1 Select the adjustment area. You can adjust the 3458A on the bench or in a system cabinet. The temperature of the adjustment environment should be °...

  • Page 39: Figure 3-1 4-Terminal Short

    Adjustment Procedures Figure 3-1 4-terminal short Keysight 3458A Calibration Manual...

  • Page 40: Front Terminal Offset Adjustment

    4 Execute the CAL 0 command. The multimeter automatically performs the front terminal offset adjustment and the display shows each of the various steps being performed. This adjustment takes about 5 minutes. When the adjustment is complete, the multimeter returns to displaying DC voltage measurements. Keysight 3458A Calibration Manual...

  • Page 41: Rear Terminal Offset Adjustment

    This adjustment takes about 5 minutes. When the adjustment is complete, the multimeter returns to displaying DC voltage measurements. 5 Remove the 4-terminal short from the rear terminals. Keysight 3458A Calibration Manual...

  • Page 42: Dc Gain Adjustment

    DC gain constants. Equipment required: A DC voltage standard capable of providing 10 VDC (the resultant accuracy of the 3458A depends on the accuracy of the voltage standard). Voltage standards from 1 V DC to 12 V DC can be used for this procedure.

  • Page 43: Resistance And Dc Current Adjustment

    This adjustment calculates gain corrections for the resistance and DC current ranges. The DC Gain Adjustment must be performed prior to this adjustment because this adjustment relies on the values calculated by the DC Gain Adjustment. Keysight 3458A Calibration Manual...
  • Page 44 (see note as the beginning of this adjustment). However, with offset compensation disabled, any offset voltages present will affect the adjustment. For most applications, we recommend enabling offset compensation for this adjustment. Keysight 3458A Calibration Manual...

  • Page 45: Figure 3-3 Resistance And Dc Current Adjustment Connections

    03458-66502 or 03458-66503 PC Assembly has been replaced or repaired. The AC autocalibration takes about 2 minute to complete. Figure 3-3 Resistance and DC current adjustment connections Keysight 3458A Calibration Manual...

  • Page 46: Ac Adjustment

    – 50 W BNC cable (keep this cable as short as possible) – 50 W resistive load (typically a 50 W carbon composition or metal film resistor). – BNC to Banana Plug Adapter--Keysight 1251-2277 or equivalent. In the following procedure, the output voltage of the synthesizer is adjusted CAUTION with the thermal converters in-circuit.
  • Page 47 3 Set the synthesizer to deliver a 3 V rms sinewave at a frequency of 100 kHz. Connect the synthesizer, the 3 V thermal converter, and the multimeter as shown in Figure 3-4. Record the exact DC voltage measured by the multimeter on Line A of the Adjustment Record. Keysight 3458A Calibration Manual...

  • Page 48: Figure 3-4 Characterizing The Adjustment Setup

    6 Set the synthesizer to deliver a 1 V rms sinewave at a frequency of 100 kHz. Replace the 3 V thermal converter with the 1 V thermal converter. Record the exact DC voltage measured by the multimeter on Line E of the Adjustment Record. Keysight 3458A Calibration Manual...

  • Page 49: Figure 3-5 Ac Adjustment Connections

    0.2% of the voltage recorded on Line G. Record the synthesizer's voltage setting on Line H of the Adjustment Record. 10 Disconnect the thermal converter and connect the synthesizer. 50 W resistive load. and multimeter as shown in Figure 3-5. Figure 3-5 AC adjustment connections Keysight 3458A Calibration Manual...
  • Page 50 Adjustment Record. 14 Repeat step 13 for each synthesizer setting and SCAL command shown on Lines D through H on the Adjustment Record. 15 Disconnect all equipment from the multimeter. 16 Execute the ACAL AC command. Keysight 3458A Calibration Manual...
  • Page 51 Adjustment Procedures 3458A ADJUSTMENT RECORD Adjusted by _________________________ Date _________________________ 3458A serial number or other device ID number _________________________ Previous calibration number (CALNUM? command) _______________ (record this number before adjusting the multimeter) Adjustments performed Perform an ACAL OHMS 1. _____ Front terminal offset adjustment 2.
  • Page 52 Adjustment Procedures THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. Keysight 3458A Calibration Manual...
  • Page 53 Keysight 3458A Multimeter Calibration Manual Performance Verification Tests Introduction DC Voltage Performance Tests Analog AC voltage performance tests DC Current Performance Tests Ohms Performance Tests Frequency Counter Performance Tests...

  • Page 54: Performance Verification Tests

    – Fluke 5700A AC/DC Standard – Keysight 3325A Function Generator/Frequency Synthesizer – Transfer standard DMM (3458A Opt. 002 within 90 days of CAL) – Low thermal short (see Figure 3-1 on page 39) – Low thermal test leads (such as Keysight 11053A, 11174A, or 11058A) –...

  • Page 55: Calibration Cycle

    Thermal EMF can become severe in high-temperature environments. To minimize thermal EMF, minimize the [1] Normal mode noise rejection is the multimeter’s ability to reject noise at the power line frequency from DC voltage, DC current, or resistance measurements. Keysight 3458A Calibration Manual...
  • Page 56 This generates an unwanted voltage in series with the circuit under test. To eliminate ground loops, ground all equipment/ circuits at the same physical point. – Internal Temperature: The internal temperature of the 3458A under test must ° be within 5 C of its temperature when last adjusted.

  • Page 57: General Test Procedure

    “Transfer Standard Reading”. 9 Disconnect the Verification Source from the transfer standard DMM and connect it to the 3458A under test (see Figure 4-1 (B)). Record this value on the Test Card under “Unit Under Test Reading”. 10 Calculate the difference between the transfer standard DMM reading and the UUT reading.
  • Page 58 Performance Verification Tests 11 Compare this difference to the allowable difference specified on the Test Card. If less than the specified difference, note that the test passed. If greater than the specified difference, note that the test failed. Keysight 3458A Calibration Manual...

  • Page 59: Figure 4-1 General Test Procedure

    Performance Verification Tests Figure 4-1 General test procedure Keysight 3458A Calibration Manual...

  • Page 60: Dc Voltage Performance Tests

    Preliminary steps 1 Verify that the DC source is properly warmed up. 2 The 3458A requires a 4-hour warm-up period. If this has not been done, turn the instrument ON and allow it to warm up before proceeding. 3 The internal temperature of the 3458A under test must be within 5 degrees C of its temperature when last adjusted.

  • Page 61: Dc Voltage Function Offset Test

    1 Connect a low thermal short across the front panel HI and LO input terminals of the DMM under test (see Figure 3-1 on page 39). 2 Set the range of the 3458A under test as specified in Table 4-1.

  • Page 62: Dc Voltage Function Gain Test

    LO Input terminals 3458A under test. Connect the Guard terminal of the voltage source to the guard terminal of the 3458A under test. 8 Set the range of the 3458A under test to 100 mV. Wait five minutes for the 3458A under test to thermally stabilize.
  • Page 63 HI and LO Input terminals of the 3458A under test. 13 Execute Trig SGL and read the value as measured with the 3458A under test and record this value in the “Unit under test reading” column of the DC voltage Test Record.
  • Page 64 DMM reading and the unit under test reading for each of the test points. 16 If any of the differences calculated are beyond the specified limits, refer to Chapter 3, “Adjustment Procedures”, to make adjustments. Keysight 3458A Calibration Manual...

  • Page 65: Analog Ac Voltage Performance Tests

    Preliminary steps 1 Make certain that the AC source is properly warmed up. 2 The 3458A requires a 4 hour warm up period. If this has not been done, turn the instrument ON and allow it to warm up. 3 Execute the ACAL AC function on both the transfer standard DMM and the UUT.

  • Page 66: Ac Voltage Test Procedure

    The following is a step-by-step procedure for all test points in the AC performance verification section. The procedure requires alternately connecting the transfer standard DMM and then the 3458A under test to the AC source. Because of this and because the accuracy of AC coupled measurements does not suffer due to small thermal induced offsets, the test connection can be made using shielded test leads terminated with dual banana plugs.
  • Page 67 DMM reading and the unit under test reading for each of the test points. 11 If any of the differences calculated are greater than the specified limits, refer to Chapter 3, “Adjustment Procedures”, to make adjustments. Keysight 3458A Calibration Manual...

  • Page 68: Dc Current Performance Tests

    Preliminary steps 1 Verify that the DC current source is properly warmed up. 2 The 3458A requires a 4 hour warm-up period. If this has not been done, turn the instrument ON and allow it to warm up before proceeding.

  • Page 69: Dc Current Function Offset Test

    DC current function offset test The following procedure tests the DC current offset specifications with the input terminals open. 1 Set the 3458A under test to the DC Current Function (DCI). 2 Set the range of the 3458A under test as specified in Table 4-4.

  • Page 70: Dc Current Function Gain Test

    6 Remove the connection from the transfer standard DMM to the DC current source. 7 Connect the DC current source to the 3458A under test HI and LO input terminals. 8 Execute Trig and read the value as measured with the 3458A under test and record this value in the “Unit under test reading”...
  • Page 71 11 If any of the differences calculated are beyond the specified limits, refer to Chapter 3, “Adjustment Procedures”, to make adjustments. 12 Reduce the output of the DC Current Source and disconnect it from the 3458A input terminals. Keysight 3458A Calibration Manual...

  • Page 72: Ohms Performance Tests

    Preliminary steps 1 Verify that the resistance standard is properly warmed up. 2 The 3458A requires a 4-hour warm-up period. If this has not been done, turn the instrument ON and allow it to warm up before proceeding. 3 The internal temperature of the 3458A under test must be within 5 degrees C of its temperature when last ohms adjusted.

  • Page 73: 2-Wire Ohms Function Offset Test

    1 Connect a low thermal short across the front panel HI and LO input terminals of the 3458A under test as shown in Figure 3-1 on page 39. 2 Set the 3458A under test to the 10 Ω range. Allow 5 minutes for the range relays to thermally stabilize.

  • Page 74: 4-Wire Ohms Function Gain Test

    7 Connect the resistance standard to the front panel 4-wire ohms input terminals of the 3458A under test. 8 Execute Trig two times and read the value as measured with the 3458A under test and record this value in the “Unit under test reading” column of the OHMS TESTS Test Card.
  • Page 75 DMM reading and the unit under test reading for each of the test points. 11 If any of the differences calculated are beyond the specified limits, refer to Chapter 3, “Adjustment Procedures” to make adjustments. 12 Disconnect the resistance standard from the 3458A input terminals. Keysight 3458A Calibration Manual...

  • Page 76: Frequency Counter Performance Tests

    Preliminary steps 1 Verify that the frequency source is properly warmed up. 2 The 3458A requires a 4-hour warm-up period. If this has not been done, turn the instrument ON and allow it to warm up before proceeding. 3 If the instrument self test has not been run, make certain all inputs are disconnected and execute the TEST function.
  • Page 77 6 Subtract the 10 MHz Unit Under Reading from the 10 MHz Frequency Standard Value. Record the difference on the FREQUENCY TESTS Test Card. 7 If either of the differences are beyond the limits specified, the instrument should be adjusted. See Chapter 3, “Adjustment Procedures” to make adjustments. Keysight 3458A Calibration Manual...
  • Page 78 Performance Verification Tests Keysight 3458A Calibration Manual...
  • Page 79 Performance Verification Tests Keysight 3458A Calibration Manual...
  • Page 80 Performance Verification Tests Keysight 3458A Calibration Manual...
  • Page 81 Performance Verification Tests Keysight 3458A Calibration Manual...
  • Page 82 Performance Verification Tests Keysight 3458A Calibration Manual...
  • Page 83 Keysight 3458A Multimeter Calibration Manual Command Summary Introduction ACAL CAL? CALNUM? CALSTR REV? SCAL SECURE TEMP? TEST...

  • Page 84: Command Summary

    Command Summary Introduction This section provides an alphabetical summary of commands that are used in calibrating the 3458A (adjustments or performance verification). Detailed command reference pages for each command are also included in this chapter. ACAL Autocal. Instructs the multimeter to perform one or all of its automatic calibrations.
  • Page 85 Temperature query. Returns the multimeter's internal temperature in degrees Centigrade. TEST Sel f-test. Causes the multimeter to perform a series of internal self-tests. If all constants are within their lower and upper limits, the self-test passes. Keysight 3458A Calibration Manual...

  • Page 86: Acal

    DCV autocal is performed prior to the other autocals. – The AC autocal performs specific enhancements for ACV or ACDCV (all measurement methods), ACI or ACDCI, DSAC, DSDC, SSAC, SSDC, FREQ, and PER measurements. Keysight 3458A Calibration Manual...
  • Page 87 – If power is turned off or the Reset button is pushed during an ACAL, an error is generated. You must perform an ACAL ALL to recalculate new calibration constants. – Related commands: CAL, SCAL, SECURE Example OUTPUT 722;"ACAL ALL,3458" !RUNS ALL AUTOCALS, SECURITY CODE IS 3458! (FACTORY SECURITY CODE SETTING) Keysight 3458A Calibration Manual...

  • Page 88: Cal

    (security code = 0), no security code is required to execute CAL. Refer to the SECURE command for more information on the security code and how to secure the calibration of the 3458A. Remarks – For highest accuracy, the value sent with the CAL command must exactly equal the actual output value of the adjustment source.
  • Page 89 – Related commands: ACAL, SCAL, SECURE Example OUTPUT 722; "CAL 10.0011" !DCV ADJUSTMENT SOURCE = 10.0011 VOLTS OUTPUT 722;"OCOMP ON" OUTPUT 722:"CAL 10000.001" !RESISTANCE ADJUSTMENT SOURCE = 10000.001 OHMS Keysight 3458A Calibration Manual...

  • Page 90: Cal

    Specifies which of the four calibration constant values is to be returned. The cal_item parameter choices are: cal_item Description Initial (nominal) value Actual value Upper limit Lower limit [a] The default for cal_item is the actual value. Keysight 3458A Calibration Manual...
  • Page 91 100 ohm zero front 1 K ohm zero front 10 K ohm zero front 100 K ohm zero front 1 M ohm zero front 10 M ohm zero front 100 M ohm zero front 1 G Keysight 3458A Calibration Manual...
  • Page 92 1 G ohmf zero rear 10 ohmf zero rear 100 ohmf zero rear 1 K ohmf zero rear 10 K ohmf zero rear 100 K ohmf zero rear 1 M ohmf zero rear 10 M Keysight 3458A Calibration Manual...
  • Page 93 10 µA dci zero rear 100 µA dci zero rear 1 mA -ACAL OHMS dci zero rear 10 mA dci zero rear 100 mA dci zero rear 1 A dcv gain 100 mV Keysight 3458A Calibration Manual...
  • Page 94 100 K ohm ocomp gain 1 M -ACAL OHMS ohm ocomp gain 10 M ohm ocomp gain 100 M ohm ocomp gain 1 G dci gain 100 nA dci gain 1 µA dci gain 10 µA Keysight 3458A Calibration Manual...
  • Page 95 .01 PLC high aperture slope .1 PLC high aperture null .01 PLC -ACAL DCV high aperture null .1 PLC underload dcv 100 mV underload dcv 1 V underload dcv 10 V Keysight 3458A Calibration Manual...
  • Page 96 1 G -ACAL OHMS overload ohm 10 overload ohm 100 overload ohm 1 K overload ohm 10 K overload ohm 100 K overload ohm 1 M overload ohm 10 M overload ohm 100 M Keysight 3458A Calibration Manual...
  • Page 97 1M overload ohm ocomp 10 M overload ohm ocomp 100 M overload ohm ocomp 1 G underload dci 100 nA underload dci 1 µA underload dci 10 µA underload dci 100 µA underload dci 1 mA Keysight 3458A Calibration Manual...
  • Page 98 1 V ac offset dac 10 V ac offset dac 100 V -ACAL AC ac offset dac 1 kV acdc offset dac 10 mV acdc offset dac 100 mV acdc offset dac 1 V Keysight 3458A Calibration Manual...
  • Page 99 12 V level dac ac 1.2 V level dac dc 12 V dcv trigger offset 100 mV dcv trigger offset 1 V dcv trigger offset 10 V dcv trigger offset 100 V dcv trigger offset 1000 V Keysight 3458A Calibration Manual...
  • Page 100 100 mV acv sync gain 1 V acv sync gain 10 V acv sync gain 100 V acv sync gain 1 kV ab ratio gain ratio acv ana gain 10 mV acv ana gain 100 mV Keysight 3458A Calibration Manual...
  • Page 101 10 mV -SCAL amplifier high frequency dac 100 mV amplifier high frequency dac 1 V amplifier high frequency dac 10 V Keysight 3458A Calibration Manual...
  • Page 102 !Enables alpha/numberic query response 60 OUTPUT 722;"CAL? 2", T !Queries constant #2 70 ENTER 722;A$ 80 PRINT A$ 90 END Return the entire set of calibration constants. PRINTER IS 701 DOM A$ [100] !Specifies the cal_item Keysight 3458A Calibration Manual...
  • Page 103 Command Summary FOR N=1 TO 253 PRINT "Cal item=", T PRINT "CONST =", N OUTPUT 722;"QFORMAT ALPHA" OUTPUT 722;"CAL?";N,T ENTER 722; A$ 100 PRINT A$ 110 NEXT N 120 END Keysight 3458A Calibration Manual...

  • Page 104: Calnum

    CALNUM. When you receive the multimeter, read the calibration number to determine its initial value. – Related commands: CAL. CALSTR. SCAL Example 10 OUTPUT 722;"CALNUM?" !READS CALIBRATION NUMBER 20 ENTER 722;A !ENTERS RESPONSE INTO COMPUTER 30 PRINT A !PRINTS RESPONSE 40 END Keysight 3458A Calibration Manual...

  • Page 105: Calstr

    – Query Command. The CALSTR? query command returns the character string from the multimeter's calibration RAM. This is shown in the second example below. – Related commands: CAL, CALNUM?, SCAL, SECURE Examples CALSTR OUTPUT 722; "CALSTR ’CALIBRATED 04/02/1987; temp(C)=43.1’" Keysight 3458A Calibration Manual...
  • Page 106 Command Summary CALSTR? 10 DIM A$[80] !DIMENSION STRING VARIABLE 20 OUTPUT 722; "CALSTR?" !READ THE STRING 30 ENTER 722;A$ !ENTER STRING 40 PRINT A$ !PRINT STRING 50 END Keysight 3458A Calibration Manual...

  • Page 107: Rev

    The second number- is the inguard firmware revision. Syntax REV? Example 10 OUTPUT 722; "REV?" !READ FIRMWARE REVISION NUMBERS 20 ENTER 722; A,B !ENTER NUMBERS 30 PRINT A,B !PRINT NUMBERS 40 END Keysight 3458A Calibration Manual...

  • Page 108: Scal

    (security code = 0), no security code is required to execute SCAL. Refer to the SECURE command for more information on the security code and how to secure the adjustment of the 3458A. Remarks – The SCAL command is in the full menu; it is not in the short menu.
  • Page 109 Command Summary – Related commands: ACAL, CAL, SECURE Keysight 3458A Calibration Manual...
  • Page 110 Command Summary Example OUTPUT 722;"SCAL 1E5" !Adjusts for frequency OUTPUT 722;"SCAL 10" !Adjusts range OUTPUT 722;"SCAL 1" OUTPUT 722;"SCAL 0.1" Keysight 3458A Calibration Manual...

  • Page 111: Secure

    Power-on acal_secure = Previously specified value (OFF is the factory setting). Default acal_secure = OFF. Remarks – Specifying 0 for the new_code disables the security feature making it no longer necessary to enter the security code to perform an adjustment or autocal. Keysight 3458A Calibration Manual...
  • Page 112 – Related commands: ACAL. CAL. CALNUM?. CALSTR. SCAL Examples Changing the code OUTPUT 722;"SECURE 3458,4448,ON" !CHANGE FACTORY SECURITY CODE TO 4448, !ENABLE AUTOCAL SECURITY Disabling security OUTPUT 722;"SECURE 3458,0" !DISABLES SECURITY FOR ADJUSTMENT AND AUTOCAL Keysight 3458A Calibration Manual...

  • Page 113: Temp

    – Monitoring the multimeter's temperature is helpful to determine when to perform autocalibration. – Related commands: ACAL, CAL, CALSTR Example 10 OUTPUT 722; "TEMP?" !READ TEMPERATURE 20 ENTER 722; A !ENTER RESULT 30 PRINT A !PRINT RESULT 40 END Keysight 3458A Calibration Manual...

  • Page 114: Test

    AUXERR? (auxiliary error register only). – NOTE: The internal self-test checks all calibration constants and verifies they are within the lower and upper limits. – Related commands: AUXERR?, ERR?, ERRSTR? Example OUTPUT 722;"TEST" !RUNS SELF-TEST Keysight 3458A Calibration Manual...

  • Page 115: Specifications

    Keysight 3458A Multimeter Calibration Manual Specifications For the specifications and characteristics of the 3458A multimeter, refer to the datasheet at http://literature.cdn.keysight.com/litweb/pdf/5965-4971E.pdf.
  • Page 116 Specifications THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. Keysight 3458A Calibration Manual...
  • Page 117 Keysight 3458A Multimeter Calibration Manual Electronic Calibration of the 3458A (Product Note 3458A-3) Introduction Saving Calibration Time and Money Summary...

  • Page 118: Electronic Calibration Of The 3458A (Product Note 3458A-3)

    1000 V AC range and converted to a DC voltage equal to 0.25 V. The final reading appears as “250.0 V AC.” (In general, AC in the 3458A multimeter uses 2 V full-scale.) These first two building blocks govern the voltmeter's basic characteristics such as its number of digits, its ranges, and its sensitivity.

  • Page 119: Saving Calibration Time And Money

    Electronic Calibration of the 3458A (Product Note 3458A-3) Saving Calibration Time and The basis for auto-calibration Money Only three external inputs are needed as the basis for all normal adjustments: he increasing accuracy required of today's – Four-wire short instrumentation tends to increase complexity and –...
  • Page 120 Electronic Calibration of the 3458A (Product Note 3458A-3) and offset correction for each function and range. analog-to-digital converter design. These These correction constants were then stored in measurements reveal integral linearity below 0.1 non-volatile memory and used to correct the parts per million and differential linearity of 0.02...

  • Page 121: Offset Adjustments

    Electronic Calibration of the 3458A (Product Note 3458A-3) Offset adjustments Internal tolerance limits for each gain adjustment are factory set. A gain value outside the associated tolerance indicates a malfunctioning To remove offset errors of internal circuits, the instrument. Therefore, as the gain adjustments...

  • Page 122: Resistance And Dc Current Adjustments

    Electronic Calibration of the 3458A (Product Note 3458A-3) Gain adjustments are now made for all other DC Input voltages greater than 100 V (1000 V range) voltage ranges. create a self-heating error in the resistor network, as shown in Figure 3. This easily identified error is...

  • Page 123: Ac Flatness And Gain Adjustments

    Electronic Calibration of the 3458A (Product Note 3458A-3) additional information needed to adjust matter of measuring and storing the results as resistance and current measurements. adjustment constants. Both current and resistance are calibrated AC flatness and gain adjustments concurrently. For resistance measurements, a...
  • Page 124 Electronic Calibration of the 3458A (Product Note 3458A-3) of the input signal, which can be shown using Fourier transform theory. Figure 5. The frequency response of the AC attenuator is adjusted based Figure 6. on two readings taken at specific delays after application of a Positive and negative signals are internally provided to eliminate step input.

  • Page 125: One-Time Adjustments

    For example, the cumulative transfer error for the 3458A multimeter is less than 1 part per million on the lower three DC volt ranges. All calibration transfer errors and noise errors are included in the published accuracy specifications of the 3458A multimeter.

  • Page 126: Summary

    Electronic Calibration of the 3458A (Product Note 3458A-3) Summary – DC volts, 0.1 V to 10 V ranges, Front and rear input terminal paths; 6 offset constants – Two-wire resistance, 10 W to 1 GW ranges, Electronic internal calibration of the 3458A Front and rear input terminal paths;...
  • Page 127 This information is subject to change without notice. Always refer to the Keysight website for the latest revision. © Keysight Technologies 1988 - 2017 Edition 7, July 1, 2017 Printed in Malaysia *03458-90017* 03458-90017 www.keysight.com...

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