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Electronic Calibration of the 3458A (Product Note 3458A-3)

122

Keysight 3458A Calibration Manual

Gain adjustments are now made for all other DC

voltage ranges.

Using the input path for the 10 V range,

accurately measure

1 V generated internally.

Linearity of the measurement circuits allows a

measurement that accurately reflects the actual l

V output. In other words, we transfer traceable

accuracy from the 10 V range to all other ranges.
The lower ranges use amplifiers to condition the

input for the 10 V full-scale analog-to-digital

converter. Each amplifier used requires a gain

constant, G

, to adjust normal readings. The

following process determines these constants.

In the 1 V range, measure the same 1 V

previously measured with the 10 V range.

Calculate a 1 V range gain adjustment so that

the two measurements agree. Note that

neither the precise value nor the long-term

stability of the internal 1 volt source are

important. The internal 1 volt source need

only be stable for the time it takes to measure

it twice.

Using the adjusted 1 V range, accurately

measure 0.1 V generated internally.

Measure the same 0.1 V using the 100 mV

range.

Calculate a 100 mV range gain adjustment so

that the two measurements agree.

Normal 100 V and 1000 V range measurements

use a 100:1 resistor network to attenuate the

input. To correct errors introduced by this

network, we apply zero volts to the input. Then,

we apply 10 V and measure the actual value.

Finally, we measure 0.1 V, with the zero error

removed, and compute the gain adjustment

constant.

Input voltages greater than 100 V (1000 V range)

create a self-heating error in the resistor network,

as shown in Figure 3. This easily identified error is

simply specified as part of the instrument's

published error. Additional measurements result

in constants to compensate for switching

transients and leakage currents.

Figure 3.

On the 1000 V range, nonlinear self-heating errors of the 100:1

resistive attenuator are noticeable.

Resistance and DC current

adjustments

Calibration of all resistance (nine ranges from

to 1 G

) and DC current ranges (eight

ranges from 100 nA to 1 A) requires only one

external resistance standard. Resistance is

measured by applying a known current through

the unknown resistance and measuring the

voltage across it. Current is measured by

applying the unknown current through a known

shunt resistor and measuring the voltage across

it. The process explained previously has already

corrected errors in the DC voltage input path.

Measuring the actual values of the current

sources and shunt resistors results in the

Содержание 3458A

Страница 1: ...Keysight 3458A Multimeter Calibration Manual ...

Страница 2: ...s customarily provided to the public to use modify reproduce release per form display or disclose commercial computer software or commercial com puter software documentation No additional government requirements beyond those set forth in the EULA shall apply except to the extent that those terms rights or licenses are explicitly required from all providers of commercial computer software pursu ant...

Страница 3: ... 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 4 Keysight products may contain remanufactured parts equivalent to new in performance or may have been subject to incidental use 5 The warranty period begins on the date of delivery or on the date of installa...

Страница 4: ...TENT ALLOWED BY LOCAL LAW THE REMEDIES IN THIS WARRANTY STATEMENT ARE CUSTOMER S SOLE AND EXLUSIVE REMEDIES EXCEPT AS INDICATED ABOVE IN NO EVENT WILL KEYSIGHT OR ITS SUPPLIERS BE LIABLE FOR LOSS OF DATA OR FOR DIRECT SPECIAL INCIDENTAL CONSEQUENTIAL INCLUDING LOST PROFIT OR DATA OR OTHER DAMAGE WHETHER BASED IN CONTRACT TORT OR OTHERWISE FOR CONSUMER TRANSACTIONS IN AUSTRALIA AND NEW ZEALAND THE ...

Страница 5: ... Oct 1988 DFARS 252 211 7015 May 1991 or DFARS 252 227 7014 Jun 1995 as a commercial item as defined in FAR 2 101 a or as Restricted computer software as defined in FAR 52 227 19 Jun 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 standar...

Страница 6: ...ECTRIC SHOCK Instruction manual symbol affixed to Alternating current AC product Indicates that the user must refer to the manual for specific WARNING or CAUTION information to avoid personal injury or damage to the product Indicates the field wiring terminal that must be connected to earth ground before operating the equipment protects against electrical shock in case of fault Frame or chassis gr...

Страница 7: ...flammable gases or fumes For continued protection against fire replace the line fuse s only with fuse s of the same voltage and current rating and type DO NOT use repaired fuses or short circuited fuse holders Keep away from live circuits Operating personnel must not remove equipment covers or shields Procedures involving the removal of covers or shields are for use by service trained personnel on...

Страница 8: ... and repair to ensure that safety features are maintained Measuring high voltages is always 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 Permanent wiring of hazardous voltage or sources capable of delivering grater than 150 VA should be labeled fused or in some other way pro...

Страница 9: ... and Control Instrument product The affixed product label is as shown below Do not dispose in domestic household waste 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 link...

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Страница 11: ...ction 20 Calibration Security 21 Security code 21 Changing the security code 21 Hardware lock out of calibration 23 Number of calibrations 23 Monitoring for CAL violations 24 Monitoring Calibration Constants 25 2 Operational Verification Tests Introduction 28 Operational Tests 29 Required equipment 29 Preliminary steps 29 2 wire ohms function offset test 30 4 wire ohms function gain test 31 DC vol...

Страница 12: ...procedure 57 DC Voltage Performance Tests 60 Required equipment 60 Preliminary steps 60 DC voltage function offset test 61 DC voltage function gain test 62 Analog AC voltage performance tests 65 Required equipment 65 Preliminary steps 65 AC voltage test procedure 66 DC Current Performance Tests 68 Required equipment 68 Preliminary steps 68 DC current function offset test 69 DC current function gai...

Страница 13: ... 104 CALSTR 105 REV 107 SCAL 108 SECURE 111 TEMP 113 TEST 114 A Specifications B Electronic Calibration of the 3458A Product Note 3458A 3 Introduction 118 Saving Calibration Time and Money 119 The basis for auto calibration 119 Offset adjustments 121 DC gain adjustments 121 Resistance and DC current adjustments 122 AC flatness and gain adjustments 123 One time adjustments 125 Traceability 125 Summ...

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Страница 15: ...e 3 1 4 terminal short 39 Figure 3 2 DC gain adjustment connections 43 Figure 3 3 Resistance and DC current adjustment connections 45 Figure 3 4 Characterizing the adjustment setup 48 Figure 3 5 AC adjustment connections 49 Figure 4 1 General test procedure 59 ...

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Страница 17: ... Tables Table 4 1 Offset performance tests 61 Table 4 2 DCV gain performance tests 63 Table 4 3 AC performance tests 67 Table 4 4 Current offset performance tests 69 Table 4 5 DCI gain performance tests 70 Table 4 6 OHMF gain performance tests 74 ...

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Страница 19: ...Keysight 3458A Multimeter Calibration Manual 19 1 3458A Calibration Introduction Introduction 20 Calibration Security 21 Monitoring Calibration Constants 25 ...

Страница 20: ... obtain best accuracy Chapter 4 Performance Verification is comprised of test procedures used to verify that all parts of the instrument are functioning properly and within specification This chapter contains Test Cards for recording the results of each test Chapter 5 Command Summary provides an alphabetical summary of commands that are used in adjusting and performance testing the 3458A Appendix ...

Страница 21: ...the SECURE command which has the following syntax SECURE old_code new_code acal_secure The procedure for changing the security code is as follows 1 Access the SECURE command Press the blue SHIFT key then the S menu key If using the full command menu use the scroll key to display the SECURE command 2 Enter the old security code the delimiter and the new security code If you want to control the auto...

Страница 22: ...e S MENU key Use the scroll key if in the full command menu to display the SECURE command f Enter the number 0 followed by the delimiter and the security code you want to use g Press the ENTER key h Turn the instrument off disconnect power and return jumper JM600 to the left position front of instrument facing you i Replace the top cover and reconnect power The instrument will now respond to the n...

Страница 23: ... to the top cover that must be broken to remove the cover indicating if unauthorized access to the hardware has occurred Number of calibrations You can monitor the number of times calibration has been performed CAL and ACAL combined if ACAL is secured by the SECURE command by using the CALNUM command CALNUM calibration number query returns a decimal number indicating the number of times the multim...

Страница 24: ...thorized calibration has taken place use the CALNUM command to access the current number of calibrations as described in the previous section Store this number in the calibration string must be done remotely with the CALSTR command i e OUTPUT 722 CALSTR calnum 270 At any later time you can execute the CALNUM and CALSTR commands and compare the two calibration numbers If the CALNUM is greater than ...

Страница 25: ...bout each constant appears in the CAL command located in Chapter 5 Command Summary WARNING Only qualified service trained personnel who are aware of the hazards involved should remove or install the multimeter or connect wiring to the multimeter Disconnect the multimeter s power cord before removing any covers changing the line voltage selector switches or installing or changing the line power fus...

Страница 26: ...er will be damaged if any of the above maximum non destructive inputs are exceeded Rated input Maximum non destructive input HI to LO Input l000 V peak 1200 V peak HI LO W Sense to LO Input 200 V peak 350 V peak HI to LO W Sense 200 V peak 350 V peak LO Input to Guard 200 V peak 350 V peak Guard to Earth Ground 500 V peak l000 V peak HI LO Input HI LO W Sense or I terminal to earth ground l000 V p...

Страница 27: ...Keysight 3458A Multimeter Calibration Manual 27 2 Operational Verification Tests Introduction 28 Operational Tests 29 ...

Страница 28: ...that the 3458A is operational and meets the specifications listed in Appendix A Operational Verification Tests perform a three point verification These three points are the basis for all internal electronic adjustments see the section titled The basis for auto calibration in Appendix B Electronic Calibration of the 3458A Product Note 3458A 3 Prior to the three point test a self test verifies that ...

Страница 29: ...ast calibrated Use the TEMP command to obtain the current internal temperature and compare it to the calibration temperature obtained by executing the command CAL 59 for DCV and CAL 60 for OHMS You can use the and scroll keys to view entire CAL message Record the temperatures on the Test Card 4 If the instrument self test has not been run make certain all inputs are disconnected and execute the TE...

Страница 30: ...es 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 Reading must be less than the limit specified on the test card 5 Remove the short from the front panel input terminals and connect it to the rear input HI and LO terminals 6 Change the Terminals switch to the Rear position 7 Allow 5 minutes for...

Страница 31: ...rig from the front panel two times and read the value of the resistance standard as measured with the transfer standard DMM and record this reading in the Transfer standard reading column of the ohms gain operational test card 7 Remove the connection between the transfer standard DMM and the resistance standard 8 Connect the resistance standard to the 4 wire ohms input terminals of the 3458A under...

Страница 32: ... auto calibration will take approximately two minutes to complete 2 Configure the transfer standard DMM as follows DCV NDIG 8 NPLC 100 Trig SGL 3 Configure the DMM under test as follows DCV NDIG 8 NPLC 100 Trig SGL 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 D...

Страница 33: ...V range This reading and the 10 V and 10 V readings from the previous DCV gain test are used to do a turnover check of the A D converter and verify its linearity 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 to 10 V 3 Let the instrument sit for five minutes before taking a readi...

Страница 34: ...t 1 Short 10 W N A __________ N A 00 25007 00 25007 __________ __________ Front terminals 2 Short 10 W N A __________ N A 00 25007 00 25007 __________ __________ Rear terminals 4 wire ohms function gain test 3 10 kW 10 kW __________ __________ __________ 00 000142 00 000142 __________ __________ CAL 59 _________________________ TEMP _________________________ Difference _________________________ mu...

Страница 35: ...alibration Manual 35 3 Adjustment Procedures Introduction 36 Required Equipment 37 Preliminary Adjustment Procedure 38 Front Terminal Offset Adjustment 40 Rear Terminal Offset Adjustment 41 DC Gain Adjustment 42 AC Adjustment 46 ...

Страница 36: ...er All of the adjustments can be performed in approximately one hour you must allow 4 hours of warm up time from the time power is applied to the multimeter before performing any adjustments Whenever adjusting the multimeter always perform the adjustments numbered 1 through 4 in the above list Adjustment number 5 AC Adjustment is required only once every 2 years or whenever the 03458 60502 or 0345...

Страница 37: ...tage Standard Fluke 732A or equivalent for the DC Gain Adjustment 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 and the type o...

Страница 38: ... the 3458A User s Guide for information on setting the line voltage switches and installing the line power fuse 3 Remove all external input signals from the front and rear input terminals 4 Select the DCV function use the DCV key and the 100 mV range repeatedly press the down arrow key until the range no longer changes Refer to Chapter 2 of the 3458A User s Guide for more information on front pane...

Страница 39: ...Adjustment Procedures 3 Keysight 3458A Calibration Manual 39 Figure 3 1 4 terminal short ...

Страница 40: ...res 2 Connect a 4 terminal short across the front panel HI and LO Input terminals and the HI and LO W Sense terminals as shown in Figure 3 1 on page 39 3 After connecting the 4 terminal short allow 5 minutes for thermal equilibrium 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 T...

Страница 41: ...Execute the CAL 0 command The multimeter automatically performs the rear 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 5 Remove the 4 terminal short from the rear terminals NOTE Take precautions to prevent thermal changes ne...

Страница 42: ...function 2 Set the front panel Terminals switch to Front 3 Connect the voltage standard to the multimeter s front panel HI and LO Input terminals as shown in Figure 3 2 If using a Guard wire as shown in Figure 3 2 set the Guard switch to the Open position If not using a Guard wire set the Guard switch to the To LO position 4 Execute the CAL command specifying the exact output voltage of the standa...

Страница 43: ...tment connections 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 ...

Страница 44: ...t using a much longer delay e g 1 second If the two measurements are significantly different you should use a longer delay in the adjustment procedure You must specify the longer delay using the DELAY command prior to executing the CAL command step 5 For example to specify a 200 ms delay execute DELAY 200E 3 The multimeter will then use the specified delay in the adjustment If a value of less than...

Страница 45: ...execute CAL 10 003E3 The multimeter automatically performs the resistance and DC current adjustment and the display shows each of the various steps being performed This adjustment takes about 12 minutes When the adjustment is complete the multimeter returns to displaying resistance readings 6 Disconnect the resistance standard from the multimeter 7 Execute the ACAL AC command use the AUTO CAL key ...

Страница 46: ...er Ballantine 1395A 1 or equivalent 0 5 V Thermal Converter Ballantine 1395A 0 4 or equivalent 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 Procedure In the following procedure steps 1 through 12 characterize the frequency flatness of the synthesizer and...

Страница 47: ...he Adjustment Record NOTE The voltages referenced in this procedure are 3 V 1 V and 100 mV rms for the SCAL 10 SCAL 1 and SCAL 1 commands respectively If necessary you can use any value between 3 V and 10 V rms wherever 3 V is referenced 300 mV to 1 V rms wherever 1 V is referenced and 30 mV to 100 mV wherever 100 mV is referenced make sure not to exceed the voltage rating of the thermal converter...

Страница 48: ...age setting on Line C of the Adjustment Record 5 Set the synthesizer to deliver a 3 V rms sinewave at a frequency of 8 MHz Adjust the synthesizer until the voltage displayed on the multimeter is within 0 2 of the voltage recorded on Line A Record the synthesizer s voltage setting on Line D of the Adjustment Record 6 Set the synthesizer to deliver a 1 V rms sinewave at a frequency of 100 kHz Replac...

Страница 49: ...y of 100 kHz Replace the 1 V thermal converter with the 0 5 V thermal converter Record the exact DC voltage measured by the multimeter on Line G of the Adjustment Record 9 Set the synthesizer to deliver a 100 mV rms sinewave at a frequency of 8 MHz Adjust the synthesizer until the voltage displayed on the multimeter is within 0 2 of the voltage recorded on Line G Record the synthesizer s voltage s...

Страница 50: ...dings 12 Without changing the synthesizer settings execute the SCAL 10 command as shown on Line B of the Adjustment Record 13 Set the synthesizer to the voltage and frequency shown on Line C of the Adjustment Record Execute the SCAL command as shown on Line C of the Adjustment Record 14 Repeat step 13 for each synthesizer setting and SCAL command shown on Lines D through H on the Adjustment Record...

Страница 51: ..._______ V 3 V 100 kHz SCAL 1E5 Frequency adjustment Line B 3 V 100 kHz SCAL 10 Low freq voltage reference Line C _____________________ V 2 MHz SCAL 10 Time interpolator and flatness Line D _____________________ V 8 MHz SCAL 10 Flatness adjustment Line E _____________________ V 1 V 100 kHz SCAL 1 Low freq voltage reference Line F _____________________ V 8 MHz SCAL 1 Flatness adjustment Line G 100 m...

Страница 52: ...3 Adjustment Procedures 52 Keysight 3458A Calibration Manual THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK ...

Страница 53: ...ration Manual 53 4 Performance Verification Tests Introduction 54 DC Voltage Performance Tests 60 Analog AC voltage performance tests 65 DC Current Performance Tests 68 Ohms Performance Tests 72 Frequency Counter Performance Tests 76 ...

Страница 54: ...ight 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 Shielded test leads such as Keysight 11000 60001 Test card Results of the performance tests may be tabulated on the appropriate Test Card located at the end of the test procedures Ma...

Страница 55: ...minals using a cotton swab dipped in alcohol Noise Rejection For DC voltage DC current and resistance measurements the multimeter achieves normal mode noise rejection NMR 1 for noise at the A D converter s reference frequency typically the same as the power line frequency when the integration time is 1 power line cycles You can specify integration time in terms of power line cycles PLCs using the ...

Страница 56: ...uit under test are grounded at physically different points A typical example of this is when a number of instruments are plugged into a power strip in an equipment rack If there is a potential difference between the ground points a current will flow through this ground loop This generates an unwanted voltage in series with the circuit under test To eliminate ground loops ground all equipment circu...

Страница 57: ...L 10K These temperatures can be determined by executing the commands CAL 58 CAL 59 CAL 60 4 If the instrument self test has not been run verify all inputs are disconnected and execute the TEST function The display must read SELF TEST PASSED B Repeated for each function and range tested 5 Execute the ACAL command for the function being tested on both the transfer standard and the unit under test UU...

Страница 58: ...ight 3458A Calibration Manual 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 ...

Страница 59: ...Performance Verification Tests 4 Keysight 3458A Calibration Manual 59 Figure 4 1 General test procedure ...

Страница 60: ... The internal temperature of the 3458A under test must be within 5 degrees C of its temperature when last adjusted Use the TEMP command to obtain the current internal temperature and compare it to the calibration temperature obtained by executing the command CAL 59 Record the temperatures obtained on the DC VOLTAGE TESTS test card 4 If the instrument self test has not been run make certain all inp...

Страница 61: ...3 1 on page 39 2 Set the range of the 3458A under test as specified in Table 4 1 3 Let the instrument sit for five minutes before taking the first reading to allow the range relay and short to thermally stabilize NOTE The thermal stabilization achieved for the 100 mV range is present for the 1V and 10V ranges since these ranges use the same relays The range relays are opened for the 100V and 1000V...

Страница 62: ...ource using a shorting strap 2 Connect the leads of a shielded low thermal EMF cable from the source output terminals to the Input HI and LO terminals of the transfer standard DMM 3 Connect the Guard terminal of the voltage source to the guard terminal of the DMM 4 Set the range of the DMM to 100 mV Wait five minutes for the DMM to thermally stabilize 5 Set MATH NULL on the transfer standard DMM 6...

Страница 63: ...als 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 14 Repeat steps 11 through 14 for each of the remaining DC voltage test points specified in Table 4 2 NOTE The thermal stabilization achieved for the 100 mV range is present for the 1V and 10V ranges since...

Страница 64: ...rmed calculate and record in the column provided The difference absolute value between the transfer standard 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 ...

Страница 65: ...ke 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 This auto calibration will take approximately 1 minute to complete 4 If the instrument Self Test has not been run make certain all inputs are disconnecte...

Страница 66: ...ect the AC voltage source to the transfer standard DMM 2 Set the range of the transfer standard DMM as specified in Table 4 3 3 Set the range of the 3458A under test as specified in Table 4 3 4 Set the AC source to the voltage level and frequency specified in Table 4 3 5 Execute Trig SGL and read the output of the AC source as measured with the transfer standard DMM and record this reading in the ...

Страница 67: ...the differences calculated are greater than the specified limits refer to Chapter 3 Adjustment Procedures to make adjustments Table 4 3 AC performance tests AC test number DMM range Source level Source frequency 1 100 mV 100 mV 1 kHz 2 1 V 1 V 1 kHz 3 10 V 1 V 1 kHz 4 10 V 10 V 20 Hz 5 10 V 10 V 1 kHz 6 10 V 10 V 20 kHz 7 10 V 10 V 100 kHz 8 10 V 10 V 1 MHz 9 100 V 100 V 1 kHz 10 a a NOTE After co...

Страница 68: ...eeding 3 The internal temperature of the 3458A under test must be within 5 degrees C of its temperature when last adjusted The current internal temperature is obtained by executing TEMP Compare this temperature to the calibration temperature obtained by executing the command CAL 60 Record these temperatures on the DC CURRENT TESTS Test Card 4 If the instrument self test has not been run make certa...

Страница 69: ...range relays to thermally stabilize 4 Execute Trig and record the absolute value of the offset reading of each range listed in Table 4 4 on the DC CURRENT TESTS Test Card provided at the end of this section 5 If the offset tests are out of specification perform another ACAL before performing step 6 below 6 If any of the offset readings are beyond the limits specified in the Test Record the instrum...

Страница 70: ... 4 Set the DC source to the current level specified in Table 4 5 5 Execute Trig SGL and read the output of the DC current source as measured with the transfer standard DMM and record this reading in the Transfer standard reading column of the DC CURRENT TESTS Test Card 6 Remove the connection from the transfer standard DMM to the DC current source 7 Connect the DC current source to the 3458A under...

Страница 71: ... provided the difference absolute value between the transfer standard DMM reading and the unit under test reading for each test point 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 ...

Страница 72: ... 3458A under test must be within 5 degrees C of its temperature when last ohms adjusted The current internal temperature can be obtained by executing TEMP Compare this temperature to adjustment temperature obtained by executing the command CAL 60 and record both temperatures on the OHMS TESTS Test Card 4 If the instrument self test has not been run make certain all inputs are disconnected and exec...

Страница 73: ...ange Allow 5 minutes for the range relays to thermally stabilize 3 Execute Trig and use the OHMS TESTS Test Card to record the offset reading 4 Remove the short from the front panel input terminals 4 wire ohms function offset test rear terminals This procedure performance verifies the rear terminal ohms offset 1 Connect a low thermal short across the rear terminals of the 3458A as shown for the fr...

Страница 74: ...standard to the ohms level specified in Table 4 6 5 Execute Trig and read the output of the resistance standard as measured with the transfer standard DMM and record this reading in the Transfer standard reading column of the OHMS TESTS Test Card 6 Remove the connection from the transfer standard DMM to the resistance standard 7 Connect the resistance standard to the front panel 4 wire ohms input ...

Страница 75: ... adjustments 12 Disconnect the resistance standard from the 3458A input terminals 6 1 MW 1 MW 7 a 10 MW 10 MW a NOTE At 10 MW leakage current from the Sense leads introduce additional uncertainty in the measurement This uncertainty however is accounted for in the published performance test limit For best accuracy and consistency across calibration sites and environments Test 7 can be performed usi...

Страница 76: ...ow 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 The display must read SELF TEST PASSED 4 Configure the DMM under test as follows FREQ Trig SGL FSOURCE ACDCV LEVEL 0 DC Frequency counter accuracy test 1 Execute FSOURCE ACDCV specifies the type of signal to be used as the input signal for frequen...

Страница 77: ...and record the exact Frequency Standard Value on the FREQUENCY TESTS Test Card Execute Trig and record the Unit Under Test Reading on the FREQUENCY TESTS Test Card 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 Se...

Страница 78: ..._ N A 00 0000023 V 00 0000023 V __________ __________ 4 Short 100 V N A __________ N A 000 000036 V 000 000036 V __________ __________ 5 Short 1000 V N A __________ N A 0000 00010 V 0000 00010 V __________ __________ Gain test 1 100 mV 100 mV __________ __________ __________ 000 00212 mV 000 00188 mV __________ __________ 2 1 V 1 V __________ __________ __________ 0 00000998 V 0 00000740 V _______...

Страница 79: ...__________ __________ 3 1 V 1 kHz 10 V __________ __________ __________ 00 00096 V 00 00096 V __________ __________ 4 10 V 20 Hz 10 V __________ __________ __________ 00 01338 V 00 01338 V __________ __________ 5 10 V 1 kHz 10 V __________ __________ __________ 00 00250 V 00 00250 V __________ __________ 6 10 V 20 kHz 10 V __________ __________ __________ 00 00272 V 00 00272 V __________ _________...

Страница 80: ...µA 000 00095 µA __________ __________ 2 Open 1 mA N A __________ N A 0 0000065 mA 0 0000065 mA __________ __________ 3 Open 10 mA N A __________ N A 00 000065 mA 00 000065 mA __________ __________ 4 Open 100 mA N A __________ N A 000 00065 mA 000 00065 mA __________ __________ 5 Open 1 A N A __________ N A 0 0000115 A 0 0000115 A __________ __________ Gain test 1 100 µA 100 µA __________ _________...

Страница 81: ...est rear terminals 1 Short 10 W N A __________ N A 00 00007 W 00 00007 W __________ __________ 4 wire function gain test 1 10 W 10 W __________ __________ __________ 00 00028 W 00 00028 W __________ __________ 2 100 W 100 W __________ __________ __________ 000 00231 W 000 00231 W __________ __________ 3 1 kW 1 kW __________ __________ __________ 0 0000142 kW 0 0000142 kW __________ __________ 4 10...

Страница 82: ...rmed by _________________________ Date _________________________ FREQUENCY TESTS Test 3458A input 3458A range Transfer standard read ing Unit under test read ing Difference Limit Std Limit Opt 002 Pass Fail 1 1 Hz N A __________ __________ __________ 0 000500 Hz 0 000500 Hz __________ __________ 2 10 MHz N A __________ __________ __________ 00 00100 MHz 00 00100 MHz __________ __________ ...

Страница 83: ...Keysight 3458A Multimeter Calibration Manual 83 5 Command Summary Introduction 84 ACAL 86 CAL 88 CAL 90 CALNUM 104 CALSTR 105 REV 107 SCAL 108 SECURE 111 TEMP 113 TEST 114 ...

Страница 84: ...ecified the initial nominal value low limit high limit or actual value of the specified constant CALNUM Calibration number query Returns a decimal number indicating the number of times the multimeter has be adjusted CALSTR Calibration string remote only Stores a string in the multimeter s nonvolatile calibration RAM Typical uses for this string include the date or place of adjustment verification ...

Страница 85: ... 85 TEMP Temperature query Returns the multimeter s internal temperature in degrees Centigrade TEST Self 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 ...

Страница 86: ...nd for more information on the security code and how to secure or unsecure autocal Remarks Since the DCV autocal applies to all measurement functions you should perform it before performing the AC or OHMS autocal When ACAL ALL is specified the 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 DSA...

Страница 87: ...ry they remain intact when power is removed You do not need to perform autocal simply because power has been cycled The approximate time required to perform each autocal routine is 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 AL...

Страница 88: ... in the CAL command security_code When a security code is set to a number other than 0 by the SECURE command you must enter the correct security code to perform a CAL If CAL is not secured 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 v...

Страница 89: ...switch the terminals to be calibrated using the front panel switch It is recommended that the OCOMP command be executed prior to adjusting with the 10 K source and OCOMP be set to ON This will account for any thermals and result in a more accurate adjustment 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...

Страница 90: ...e specified constant The returned string also contains a description of the constant This command is in the full command menu it is not in the short command menu Syntax CAL const_id cal_item cal_item Specifies which of the four calibration constant values is to be returned The cal_item parameter choices are cal_item Description 0 Initial nominal value 1 Actual value a a The default for cal_item is...

Страница 91: ...ustment 2 7 V Reference External gain adjustment 3 dcv zero front 100 mV 4 dcv zero rear 100 mV 5 dcv zero front 1 V 6 dcv zero rear 1 V 7 dcv zero front 10 V 8 dcv zero rear 10 V 9 dcv zero front 100 V 10 dcv zero rear 100 V 11 dcv zero front 1 kV 12 dcv zero rear 1 kV External zero adjustment 13 ohm zero front 10 14 ohm zero front 100 15 ohm zero front 1 K 16 ohm zero front 10 K 17 ohm zero fron...

Страница 92: ...ar 1 G 31 ohmf zero front 10 32 ohmf zero front 100 33 ohmf zero front 1 K 34 ohmf zero front 10 K External zero adjustment 35 ohmf zero front 100 K 36 ohmf zero front 1 M 37 ohmf zero front 10 M 38 ohmf zero front 100 M 39 ohmf zero front 1 G 40 ohmf zero rear 10 41 ohmf zero rear 100 42 ohmf zero rear 1 K 43 ohmf zero rear 10 K 44 ohmf zero rear 100 K 45 ohmf zero rear 1 M 46 ohmf zero rear 10 M...

Страница 93: ...m 100 M 57 offset ohm 1 G 58 cal 0 temperature 59 cal 10 temperature Internal temperatures at time of last 60 cal 10 K temperature CAL adjustment 61 vos dac Dac count to zero boot strap amp Q7 U12 External zero adj 62 dci zero rear 100 nA 63 dci zero rear 1 µA 64 dci zero rear 10 µA 65 dci zero rear 100 µA 66 dci zero rear 1 mA ACAL OHMS 67 dci zero rear 10 mA 68 dci zero rear 100 mA 69 dci zero r...

Страница 94: ...ohm gain 100 K ACAL OHMS 80 ohm gain 1 M 81 ohm gain 10 M 82 ohm gain 100 M 83 ohm gain 1 G 84 ohm ocomp gain 10 85 ohm ocomp gain 100 86 ohm ocomp gain 1 K 87 ohm ocomp gain 10 K 88 ohm ocomp gain 100 K 89 ohm ocomp gain 1 M ACAL OHMS 90 ohm ocomp gain 10 M 91 ohm ocomp gain 100 M 92 ohm ocomp gain 1 G 93 dci gain 100 nA 94 dci gain 1 µA 95 dci gain 10 µA const_id Description Constant derived fro...

Страница 95: ...3 high speed gain ACAL OHMS 104 il OFF leakage of ohmmeter current source 105 il2 input leakage correction used on 1 MW and higher 106 rin value of 10 MW attenuator RP7 107 low aperture 108 high aperture 109 high aperture slope 01 PLC 110 high aperture slope 1 PLC 111 high aperture null 01 PLC ACAL DCV 112 high aperture null 1 PLC 113 underload dcv 100 mV 114 underload dcv 1 V 115 underload dcv 10...

Страница 96: ...00 V 123 underload ohm 10 124 underload ohm 100 125 underload ohm 1 K 126 underload ohm 10 K 127 underload ohm 100 K 128 underload ohm 1 M 129 underload ohm 10 M 130 underload ohm 100 M 131 underload ohm 1 G ACAL OHMS 132 overload ohm 10 133 overload ohm 100 134 overload ohm 1 K 135 overload ohm 10 K 136 overload ohm 100 K 137 overload ohm 1 M 138 overload ohm 10 M 139 overload ohm 100 M const_id ...

Страница 97: ...148 underload ohm ocomp 100 M 149 underload ohm ocomp 1 G 150 overload ohm ocomp 10 151 overload ohm ocomp 100 152 overload ohm ocomp 1 K ACAL OHMS 153 overload ohm ocomp 10 K 154 overload ohm ocomp 100 K 155 overload ohm ocomp 1M 156 overload ohm ocomp 10 M 157 overload ohm ocomp 100 M 158 overload ohm ocomp 1 G 159 underload dci 100 nA 160 underload dci 1 µA 161 underload dci 10 µA 162 underload...

Страница 98: ...dci 1 mA 172 overload dci 10 mA 173 overload dci 100 mA 174 overload dci 1 A 175 acal dcv temperature 176 acal ohm temperature Last ACAL temperatures 177 acal acv temperature 178 ac offset dac 10 mV 179 ac offset dac 100 mV 180 ac offset dac 1 V 181 ac offset dac 10 V 182 ac offset dac 100 V ACAL AC 183 ac offset dac 1 kV 184 acdc offset dac 10 mV 185 acdc offset dac 100 mV 186 acdc offset dac 1 V...

Страница 99: ...94 acdci offset dac 1 A 195 flatness dac 10 mV 196 flatness dac 100 mV 197 flatness dac 1 V 198 flatness dac 10 V 199 flatness dac 100 V ACAL AC 200 flatness dac 1 kV 201 level dac dc 1 2 V 202 level dac dc 12 V 203 level dac ac 1 2 V 204 level dac dc 12 V 205 dcv trigger offset 100 mV 206 dcv trigger offset 1 V 207 dcv trigger offset 10 V 208 dcv trigger offset 100 V 209 dcv trigger offset 1000 V...

Страница 100: ...V 216 acv sync offset 10 mV 217 acv sync offset 100 mV 218 acv sync offset 1 V 219 acv sync offset 10 V 220 acv sync offset 100 V 221 acv sync offset 1 kV ACAL AC 222 acv sync gain 10 mV 223 acv sync gain 100 mV 224 acv sync gain 1 V 225 acv sync gain 10 V 226 acv sync gain 100 V 227 acv sync gain 1 kV 228 ab ratio 229 gain ratio 230 acv ana gain 10 mV 231 acv ana gain 100 mV const_id Description ...

Страница 101: ...38 acv ana offset 1 V 239 acv ana offset 10 V 240 acv ana offset 100 V 241 acv ana offset 1 kV ACAL AC 242 rmsdc ratio 243 sampdc ratio 244 aci gain 245 freq gain 246 attenuator high frequency dac 247 amplifier high frequency dac 10 mV SCAL 248 amplifier high frequency dac 100 mV 249 amplifier high frequency dac 1 V 250 amplifier high frequency dac 10 V const_id Description Constant derived from ...

Страница 102: ...l value lower limit upper limit or actual value Return an individual calibration constant 2 Return the entire set of calibration constants 251 amplifier high frequency dac 100 V 252 amplifier high frequency dac 1 kV SCAL 253 interpolator const_id Description Constant derived from 10 PRINTER IS 701 20 DIM A 100 30 T 3 Specifies the cal_item 40 PRINT Cal item T 50 OUTPUT 722 QFORMAT ALPHA Enables al...

Страница 103: ...mmand Summary 5 Keysight 3458A Calibration Manual 103 40 FOR N 1 TO 253 50 PRINT Cal item T 60 PRINT CONST N 70 OUTPUT 722 QFORMAT ALPHA 80 OUTPUT 722 CAL N T 90 ENTER 722 A 100 PRINT A 110 NEXT N 120 END ...

Страница 104: ...s also incremented by 1 whenever an autocal is performed if unsecured autocal does not affect the calibration number The calibration number is stored in cal protected memory and is not lost when power is removed The multimeter was adjusted before it left the factory which increments the CALNUM When you receive the multimeter read the calibration number to determine its initial value Related comman...

Страница 105: ...uotes The maximum string length is 75 characters the quotes enclosing the string are not counted as characters security_code When the calibration RAM is secured SECURE command you must include the security_code in order to write a message to the calibration RAM You can always read the string using the CALSTR command regardless of the security mode Refer to the SECURE command for information on sec...

Страница 106: ...5 Command Summary 106 Keysight 3458A Calibration Manual 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 ...

Страница 107: ...Returns two numbers separated by a comma The first number is the multimeter s outguard firmware revision 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 ...

Страница 108: ...mber other than 0 by the SECURE command you must enter the correct security code to perform an SCAL If SCAL is not secured 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 With a 100 kHz input SCAL 1...

Страница 109: ...Command Summary 5 Keysight 3458A Calibration Manual 109 Related commands ACAL CAL SECURE ...

Страница 110: ...5 Command Summary 110 Keysight 3458A Calibration Manual Example OUTPUT 722 SCAL 1E5 Adjusts for frequency OUTPUT 722 SCAL 10 Adjusts range OUTPUT 722 SCAL 1 OUTPUT 722 SCAL 0 1 ...

Страница 111: ...s an integer from 2 1E 9 to 2 1E9 If the number specified is not an integer the multimeter rounds it to an integer value acal_secure Allows you to secure autocalibration The choices are 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 secu...

Страница 112: ...y the user a procedure is presented in Chapter 1 section titled Changing the security code that allows for unsecuring the instrument after removal of the top cover 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 ADJUST...

Страница 113: ...ultimeter s internal temperature in degrees Centigrade Syntax TEMP Remarks 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 ...

Страница 114: ... error is detected the multimeter sets bit 0 in the error register and a more descriptive bit in the auxiliary error register The display s ERR annunciator illuminates whenever an error register bit is set You can access the error registers using ERRSTR both registers ERR error register only or AUXERR auxiliary error register only NOTE The internal self test checks all calibration constants and ve...

Страница 115: ... 3458A Multimeter Calibration Manual 115 A 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 ...

Страница 116: ...A Specifications 116 Keysight 3458A Calibration Manual THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK ...

Страница 117: ...Keysight 3458A Multimeter Calibration Manual 117 B Electronic Calibration of the 3458A Product Note 3458A 3 Introduction 118 Saving Calibration Time and Money 119 Summary 126 ...

Страница 118: ...must attenuate higher voltages and amplify lower voltages to give the voltmeter a selection of ranges Let s take an example Suppose we apply 250 V AC to a voltmeter with an A to D converter that requires a 1 V DC input The AC signal is attenuated on the 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...

Страница 119: ...ith unmatched accuracy precision and speed while avoiding the usual high cost of maintaining such an instrument The basis for auto calibration Only three external inputs are needed as the basis for all normal adjustments Four wire short 10 V DC voltage standard 10 kW resistance standard Normal calibration described below provides traceability of all functions ranges and internal reference standard...

Страница 120: ...eves this performance using a patented technique known as multislope integration This technique uses charge balancing where the charge from the input signal is canceled by charge injected from reference signals Multi slope integration also allows the integration aperture to be changed so that measurement resolution can be traded for measurement speed Measurements using a Josephson junction standar...

Страница 121: ...V full scale require only one external DC voltage standard The DC voltage input path shown in Figure 2 requires three adjustments potentially The product represents the calibration gain used on any given range Internal tolerance limits for each gain adjustment are factory set A gain value outside the associated tolerance indicates a malfunctioning instrument Therefore as the gain adjustments are b...

Страница 122: ... so that the two measurements agree Normal 100 V and 1000 V range measurements use a 100 1 resistor network to attenuate the input To correct errors introduced by this network we apply zero volts to the input Then we apply 10 V and measure the actual value Finally we measure 0 1 V with the zero error removed and compute the gain adjustment constant Input voltages greater than 100 V 1000 V range cr...

Страница 123: ...ference resistor to adjust current source values used for other resistance ranges 5 Use calibrated current sources to adjust shunt resistor values used for DC current measurements Leakage currents for resistance measurements and offsets produced with shunt resistors for current measurements are additional sources of error Adjustment of these errors is simply a matter of measuring and storing the r...

Страница 124: ... standard metrology practice is to use signals to correct these errors A shorter time between samples of these signals reduces 1 f noise Thus the 3458A multimeter samples at a higher rate to give 1 f rejection as indicated in Figure 6 Figure 6 Positive and negative signals are internally provided to eliminate turnover errors This input is also sampled at a higher rate to reject 1 f noise These sig...

Страница 125: ...s are in turn traceable to the external standards The problem is knowing the uncertainty to which they are traceable The answer lies in knowing the maximum uncertainty of each transfer measurement made The dominant sources of transfer uncertainty are the linearity errors of the internal circuits and the noise of each measurement Each transfer measurement contributes some error With multiple transf...

Страница 126: ...derived calibration constants Offset Constants 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 Front and rear input terminal paths 18 offset constants Four wire resistance 10 W to 1 GW ranges Front and rear input terminal paths 18 offset constants Internal Reference Constants Voltage value of internal reference voltage 1 ...

Страница 127: ...ion 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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