Keysight 3458B Calibration Manual
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Keysight 3458B Calibration Manual

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Summary of Contents for Keysight 3458B

  • 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) –...
  • Page 10 THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. Keysight 3458A Calibration Manual...

  • Page 11: Table Of Contents

    Table of Contents Keysight Technologies WARRANTY STATEMENT ....3 U.S. Government Restricted Rights ......5 Safety Symbols .
  • Page 12 ........72 2-wire ohms function offset test ......73 Keysight 3458A Calibration Manual...
  • Page 13 ..........126 Keysight 3458A Calibration Manual...
  • Page 14 Externally derived calibration constants ..... 126 THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. Keysight 3458A Calibration Manual...
  • Page 15 .....49 Figure 4-1 General test procedure ......59 Keysight 3458A Calibration Manual...
  • Page 16 THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. Keysight 3458A Calibration Manual...
  • Page 17 .....70 Table 4-6 OHMF gain performance tests ....74 Keysight 3458A Calibration Manual...
  • Page 18 THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. Keysight 3458A Calibration Manual...
  • Page 19 Keysight 3458A Multimeter Calibration Manual 3458A Calibration Introduction Introduction Calibration Adjustment Interval Calibration Security Monitoring Calibration Constants...

  • Page 20: 3458A Calibration 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 Adjustment Interval

    (,) and the acal_secure parameter ON. The instrument is shipped from the factory with the security code set to 3458 and the acal_secure parameter set to ON (security code required to do an acal). Keysight 3458A Calibration Manual...
  • 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

    – Keysight Technologies recommends that the wiring installer attach a label to any wiring having hazardous voltages. This label should be as close to the input terminals as possible and should be an eye-catching color, such as red or yellow.
  • 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

    Appendix B, "Electronic Calibration of the 3458A (Product Note 3458A-3)"). Prior to the three point test, a self test verifies that all calibration constants are within their upper and lower limits, an indicator of proper operation. Keysight 3458A Calibration Manual...

  • Page 29: Operational Tests

    – Transfer standard DMM (3458A Opt. 002 within 90 days of CAL) – Low thermal short (copper wire) – Low thermal test leads (such as Keysight 11053A, 11174A, or 11058A) – Equipment required for the adjustment procedures can be used for...

  • Page 30: 2-Wire Ohms Function Offset Test

    Operational Test Card. Reading must be less than the limit specified on the test card. If reading is greater than the limit, refer to Chapter 3 to make adjustments. 9 Remove the short from the rear input terminals. Keysight 3458A Calibration Manual...

  • Page 31: 4-Wire Ohms Function Gain Test

    DMM reading and the unit under test reading for the test. 11 If the difference calculated is greater than 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 32: Dc Voltage Function Gain Test

    DMM and record this reading in the “Transfer standard reading” column of the DC voltage operational test record. 9 Remove the connection from the transfer standard DMM to the DC voltage source. 10 Connect the 3458A under test to the DC voltage source. Keysight 3458A Calibration Manual...

  • Page 33: Dc Voltage Function Offset Test

    (UUT Reading #4) - (UUT Reading #6) = A (UUT Reading #5) - (UUT Reading #6) = B If the A-to-D converter is linear. the difference in the absolute values of A and B will be less than or equal to 4 µV. Keysight 3458A Calibration Manual...
  • 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

    The record contains information such as the date, which adjustments were performed, the calibration number, and the multimeter's adjustment temperature. You can then file the adjustment records to maintain a complete adjustment history for the multimeter. Keysight 3458A Calibration Manual...

  • 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

    6 Allow the multimeter to warm up for 4 hours from the time power was applied. (At this point. you can connect the 4-terminal short to the front terminals as shown in Figure 3-1 on page 39 to prepare for the Front Terminal Offset Adjustment.) Keysight 3458A Calibration Manual...

  • 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

    This adjustment takes about 2 minutes. When the adjustment is complete, the multimeter returns to displaying DC voltage measurements. 5 Disconnect the voltage standard from the multimeter. Keysight 3458A Calibration Manual...

  • 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 14 Repeat step 13 for each synthesizer setting, multimeter ACBAND 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 Calibration secured _________________________ Unsecured _________________________ [a] Always perform the above adjustments numbered 1 through 4: adjustment number 5 is only required once every 2 years or whenever the 03458-66502 or 03458-66503 PC Assembly has been replace or repaired. Keysight 3458A Calibration Manual...
  • 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

    – 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) – Shielded test leads (such as Keysight 11000-60001) To have your transfer standard 3458A Opt.

  • 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 5 C, you must ° recalculate all test limits based on the temperature variation beyond the 5 limitation. The published test limits were calculated without additional temperature coefficient errors added. Keysight 3458A Calibration Manual...

  • Page 57: General Test Procedure

    Test Card under “Unit Under Test Reading”. 10 Calculate the difference between the transfer standard DMM reading and the UUT reading. Record the absolute value (ignore sign) of the difference on the Test Card under “Difference”. Keysight 3458A Calibration Manual...
  • 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

    – Transfer standard DMM (3458A Opt. 002 within 90 days of CAL) – Low thermal short (copper wire) – Low thermal test leads (such as Keysight 11053A, 11174A, 11058A) Preliminary steps 1 Verify that the DC source is properly warmed up.

  • Page 61: Dc Voltage Function Offset Test

    Table 4-1 and on the DC VOLTAGE TESTS Test Card provided at the end of this chapter. Table 4-1 Offset performance tests Offset test number DMM range 100 mV 10 V 100 V 1000 V Keysight 3458A Calibration Manual...

  • Page 62: Dc Voltage Function Gain Test

    3458A under test to thermally stabilize. 9 Set MATH NULL on the 3458A under test and execute Trig SGL to trigger the NULL reading 10 REMOVE THE SHORTING STRAP FROM THE VOLTAGE SOURCE HI and LO OUTPUT TERMINALS. Keysight 3458A Calibration Manual...
  • Page 63 -1 V 10 V -10 V 10 V 10 V 100 V 100 V 1000 V 1000 V [a] NOTE: After completing test 8, decrease the 1000 V verification source output to 0 V before disconnecting. Keysight 3458A Calibration Manual...
  • 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

    5 Configure the transfer standard DMM as follows: – ACV – SETACV SYNC – ACBAND 10,2E6 – RANGE10 – RES .001 – TRIG SGL – LFILTER ON 6 Configure the DMM under test as follows: – ACV Keysight 3458A Calibration Manual...

  • Page 66: Ac Voltage Test Procedure

    “Unit under test reading” column of the VOLTAGE TESTS Test Card. 9 Repeat steps 1 through 8 for each of the remaining AC voltage test points as specified in Table 4-3. Keysight 3458A Calibration Manual...
  • 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

    – Stable DC current source (Fluke 5700A or equivalent) – Transfer standard DMM (3458A Opt. 002 within 90 days of CAL) – Low thermal test leads (such as Keysight 11053A, 11174A, or 11058A) Preliminary steps 1 Verify that the DC current source is properly warmed up.

  • Page 69: Dc Current Function Offset Test

    5 If the offset tests are out of specification, perform another ACAL before performing step 6 below. If any of the offset readings are beyond the limits specified in the Test Record, the instrument should be adjusted. Refer to Chapter 3, “Adjustment Procedures” to make adjustments. Keysight 3458A Calibration Manual...

  • Page 70: Dc Current Function Gain Test

    Table 4-5. Table 4-5 DCI gain performance tests DCI gain test number Source and DMM range Source output 100 µA 100 µA 1 mA 1 mA 10 mA 10 mA 100 mA 100 mA Keysight 3458A Calibration Manual...
  • 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

    – Transfer standard DMM (3458A Opt. 002 within 90 days of CAL) – Low thermal short (copper wire) – Low thermal test leads (such as Keysight 11053A, 11174A, or 11058A) Preliminary steps 1 Verify that the resistance standard is properly warmed up.

  • Page 73: 2-Wire Ohms Function Offset Test

    Test Card to record the offset reading. 4 Remove the short from the rear panel input terminals. 5 Connect the low thermal short across the front input terminals and repeat steps 2 and 3. Remove the short from the terminals when complete. Keysight 3458A Calibration Manual...

  • Page 74: 4-Wire Ohms Function Gain Test

    Table 4-6 OHMF gain performance tests OHMF gain test number Source and DMM range Source output 10 W 10 W 100 W 100 W 1 kW 1 kW 10 kW 10 kW 100 kW 100 kW Keysight 3458A Calibration Manual...
  • 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

    The following equipment is required for testing the frequency counter performance of the 3458A. – Stable frequency source (Keysight 3325A Frequency Synthesizer or equivalent) – Shielded test leads, BNC to dual banana plug (such as Keysight 11001-60001) Preliminary steps 1 Verify that the frequency source is properly warmed up.
  • 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

    Service calibration. Adjusts the AC section of the instrument. Calculates the corrections to accurately measure frequency and calibrates the ac ranges. SECURE Security code. Allows the person responsible for calibration to enter a security code to prevent accidental or unauthorized adjustment or autocalibration. Keysight 3458A Calibration Manual...
  • 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

    For example, a 1 V DC standard can be used instead of 10 V (you would execute CAL 1.0000). A 1 k standard can used instead of 10 k (you would execute CAL 1E3). Each case degrades the accuracy specifications of the instrument. Keysight 3458A Calibration Manual...
  • 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

    100 kHz. – SCAL 10, SCAL 1, and SCAL 0.1 do ac range calibration calculating high frequency dac and interpolator constants. – For fastest calibration with SCAL, the multimeter can be left in the DCV function. Keysight 3458A Calibration Manual...
  • Page 109 Command Summary – With a 100 kHz input, ACBAND is set to ACBAND 10, 2E6. – With 2 MHz and 8 MHz inputs, ACBAND is set to ACBAND 10, 10E6. – 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)

    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. The A-to-D converter governs a voltmeter's Keysight 3458A Calibration Manual...

  • Page 119: Saving Calibration Time And Money

    With the emergence of non-volatile memory, precision, and speed, while avoiding the usual multimeters were designed with few or no high cost of maintaining such an instrument. adjustable components. Instead, microprocessors were used to calculate a gain Keysight 3458A Calibration Manual...
  • Page 120 Figure 1. Measurements using a Josephson junction This plot shows stability with time of the reference voltage standard confirm linearity of the standard used in the 3458A multimeter. Keysight 3458A Calibration Manual...

  • Page 121: Offset Adjustments

    3 Measure accuracy of the internal reference voltage relative to the external standard, and store the difference as a reference adjustment. (When subsequently invoked, auto-calibration uses this stored value to re-determine all gain adjustment constants). Keysight 3458A Calibration Manual...

  • Page 122: Resistance And Dc Current Adjustments

    Finally, we measure 0.1 V, with the zero error corrected errors in the DC voltage input path. removed, and compute the gain adjustment Measuring the actual values of the current constant. sources and shunt resistors results in the Keysight 3458A Calibration Manual...

  • Page 123: Ac Flatness And Gain Adjustments

    AC signals, the internal circuits must have constant gain versus The user enters the exact value of the external 10 frequency of the input signal. An Keysight kilohm standard (for example, “CAL 10E3”). The Technologies patented technique electronically following sequence, performed automatically by adjusts the entire AC section, shown in Figure 4.
  • Page 124 ± signals reduces 1/f noise. effectively an offset corrected by applying the Thus the 3458A multimeter samples at a higher chopped DC levels at one-tenth the full-scale rate to give 1/f rejection, as indicated in Figure 6. voltage. Keysight 3458A Calibration Manual...

  • Page 125: One-Time Adjustments

    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. Keysight 3458A Calibration Manual...

  • Page 126: Summary

    These constants are also updated each time auto-calibration (ACAL ALL) is executed, reducing time, temperature, or Externally derived calibration environmentally-induced drift errors. This constants capability enhances measurement accuracies over extended time intervals and operating Offset Constants: temperature ranges. Keysight 3458A Calibration Manual...
  • Page 127 This information is subject to change without notice. Always refer to the Keysight website for the latest revision. © Keysight Technologies 1988 - 2021 Edition 10, September 15, 2021 Printed in Malaysia  03458-90017 www.keysight.com...

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