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Manual Change - Agilent Technologies

1. Replaceable Parts List Figure 5 7 Front Assembly 3 4 2 j a _ gt IK E e K T 7 ie x 1 4268ase07007 Table 5 7 Front Assembly 3 4 Reference Agilent Part Check Qty Description Designation Number Digit 1 04263 25151 5 1 Rubber Key 2 04263 66504 8 1 Key board Assembly 3 0515 1550 0 1 Screw M3 102 Chapter 5 Assembly Replacement Replaceable Parts List Figure 5 8 Front Assembly 4 4 426825007008 Table 5 8 Front Assembly 4 4 Reference Agilent Part Check Qty Description Designation Number Digit 1 04263 25003 6 1 Filter Transparent 2 04263 61010 1 1 LCD Assembly 3 0515 1550 0 2 Screw M3 A Quiassy TO pu D O O 3 ei Chapter 5 103 Figure 5 9 4268ase07009 Assembly Replacement Replaceable Parts List Rear View SCANNER reek OPTION 001 O e HANDLER INTERFACE o Fuse T 34 250 v 115V 230V PAN SO ITT 100VA Max d Table 5 9 Rear View Reference Agilent Part Check Qty
2. Frequency Signal Level Parameter 4268A Reading Test Result Measured a Equation 120 Hz 1000 mV Cp HF a CVil 120 Hz 1000 mV D a CV12 1 kHz 1000 mV Cp HF a CV13 1 kHz 1000 mV D a CV14 Measurement Accuracy Test 0 m 100 Meas Time MED ALC OFF Frequency Signal Level Parameter 4268A Reading Test Result Measured a Equation 120 Hz 1000 mV Rs Q a CV19 Measurement Accuracy Test 0 m 10 O Meas Time MED ALC OFF Frequency Signal Level Parameter 4268A Reading Test Result Measured a Equation 120 Hz 1000 mV Rs a CV20 1 kHz 1000 mV Rs a CV20 Measurement Accuracy Test 0 m 1 Q Meas Time MED ALC OFF Frequency Signal Level Parameter 4268A Reading Test Result Measured a Equation 120 Hz 1000 mV Rs a CV21 1 kHz 1000 mV Rs a CV21 Measurement Accuracy Test 0 m 1 Q Meas Time MED ALC ON Frequency Signal Level Parameter 4268A Reading Test Result Measured a Equation 120 Hz 1000 mV Rs a CV21 1 kHz 1000 mV Rs a CV21 48 Chapter2 Maintenance Calculation Sheet Measurement Accuracy Test 1 m 1 LE Meas Time MED ALC OFF Frequency Signal Level Parameter 4268A Reading Test Result Measured a Equation 120 Hz 1000 mV Cp uF a CVII 120 Hz 1000 mV D a CV12 1 kHz 1000 mV Cp uF a CV1
3. i TR H aa oj LO Lo Le 4268ase05028 Check3 5 V and 12 V Check 1 Turn the 4268A on 12V LED 2 When fan doesn t rotate or 12 V LED doesn t light a Using a voltmeter measure the voltage between the 12 V LED and the ground gt y Q T D ao o y G e on a b Ifthe voltage is in 12 V 0 6 V it s normal The fan or the LED suppose to be defective 3 When 5 V LED doesn t light a Using a voltmeter measure the voltage between the 5 V LED and the ground b Ifthe voltage is in 5 V 0 5V it s normal The LED supposes to be Chapter 4 71 Troubleshooting Trouble Isolation defective 4 The 5 V or 12 V voltage isn t normal power supply assembly or cable assembly between A1 and power supply seems defective Isolate them by checking the cable is broken or not using a tester Check4 12V Check 1 Turn the 4268A on 2 Using a voltmeter check the center pin of the U117 regulator If the voltage is 12 V 0 6 V it s normal Proceed to Check5 LCD Backlight Check 3 If the voltage is not normal power supply assembly or cable between Al and power supply assembly suppose to be defective 4 If the cable isn t defective replace the power supply assembly Check5 LCD Backlight Check 1 Turn the 4268A on Remove a cable connected to LCD backlight f
4. 4268ase07013 110 Chapter 5 Figure 5 14 4268ase07014 Chapter 5 111 Assembly Replacement Disassembly Procedure Power Supply Assembly Removal Tools Required e Pozidriv screwdriver pt size 1 small Procedure 1 Remove the cover refer to Cover Removal 2 Release two cables from the cable clamps item 2 and 2 in Figure 5 14 Remove the cable assemblies item 3 from the Al board Remove the five screws item 4 which fasten the shield to the chassis Remove the screw item 5 on the side of the shield Disconnect the wire assembly item 6 which is connected to the power switch Remove the cable assembly item 7 from the Power Supply assembly ROTA A D Remove the two screws on the bottom cover Power Supply Assembly Removal A Quiassy G pu D ESE O O 3 D Assembly Replacement Disassembly Procedure Fan Assembly Removal Tools Required e Pozidriv screwdriver pt size 1 small Procedure 1 Remove the cover refer to Cover Removal 2 Remove the cable attached with fan from the Al board 3 Remove the four screws which fasten the fan assembly from the side of the chassis 4 Remove the four screws connecting the fan to the plate Front Assembly Re
5. En 0000000000 e E ZI E IZOTZ Q LO 0 Le 4268ase07003 A Quiassy TO pu D O O 3 ei Chapter 5 97 Assembly Replacement Replaceable Parts List Table 5 3 Top View Mechanical Parts Reference Agilent Part Check Qty Description Designation Number Digit 1 04263 07001 6 2 Gasket 0515 1550 0 4 Screw 2 1252 6951 8 1 AC Inlet 2110 0381 7 1 Fuse 3A 250V 2110 1134 0 1 Fuse Drawer 3 04268 61621 5 1 Fan Assembly 04268 00603 5 1 Plate 3050 0891 7 4 Washer flat type 2190 0584 0 4 Washer lock type 0515 0986 4 4 Screw M3 with a pan head 0515 1005 0 4 Screw M3 with a flat head 4 04268 61634 0 1 Wire assembly Line Switch 0515 0914 8 2 Screw M3 5 04268 01203 8 1 Angle Line Switch 04339 25002 6 2 Guide 0515 0914 8 2 Screw M3 6 0370 2862 1 1 Button 04339 23001 1 1 Shaft 0535 0031 2 1 Nut 98 Chapter 5 Assembly Replacement Replaceable Parts List Figure 5 4 Bottom View oj Lo
6. 24 Set the 4268A s measurement parameter to Cs Rs 25 Connect the 100 2 Standard Resistor to the 4268A s UNKNOWN terminals 26 Press the Trig key to start the measurement 27 Record the 4268A readings of Rs on the calculation sheet 28 Calculate the test result according to the calculation sheet and record the result into the performance test record 29 Perform this test for all standards and frequency settings listed in Table 2 3 Table 2 3 Measurement Accuracy Test 0m Resistance settings Standard Signal Level ALC Frequency 100 Q 1000 mV OFF 120 Hz 100 1000 mV OFF 120 Hz 1 kHz 10 500 mV OFF 120 Hz 1 kHz ON 120 Hz 1 kHz Measurement Accuracy Test 1m 30 Reset the 4268A 31 Set the cable length to 1m 32 Connect the OPEN termination to the 4268A s UNKNOWN terminals using the 1m test leads and four BNC f BNC f adapters as shown in Figure 2 4 26 Chapter 2 Figure 2 4 4268ASE02003 Maintenance Performance Test Measurement Accuracy Test 1 m Setup HP 4268A o 0000000000 e0009 Coco 1 3 L HP 16048A 1m Test Leads A R BNC f BNC f Adapter 4 N z 5 El D 5 D 5 o 4 HP 42090A HP 42091A OPEN SHORT HP 16380C Termination Termination Standard Capacitors 33 Press the Open key blue key 4 key to display the OPEN correction menu 34 Select OpenMeas
7. Chapter 2 Standard s Calibration Values This table is used in Measurement Accuracy Tests Maintenance Calculation Sheet Standard Frequency Parameter Calibration Value Reference Designation 1000 pF 1 kHz Cp pF CV1 1000 pF 1 kHz D Cv2 0 01 uF 120 Hz Cp nF CV3 0 01 uF 120 Hz D CV4 0 01 uF 1 kHz Cp nF CV5 0 01 uF 1 kHz D CV6 0 1 uF 120 Hz Cp nF CV7 0 1 uF 120 Hz D CV8 0 1 uF 1 kHz Cp nF CV9 0 1 pF 1 kHz D CV10 1 uF 120 Hz Cp uF CVII 1 uF 120 Hz D CV12 1 uF 1 kHz Cp uF CV13 1 uF 1 kHz D CVI4 10 uF 120 Hz Cp uF CVIS 10 pF 120 Hz D CV16 10 uF 1 kHz Cp uF CV17 10uF 1 kHz D CV18 100 Q DC Rs Q CV19 100 DC Rs CV20 1Q DC Rs Q CV21 Chapter 2 45 D BK 5 2 4 5 D 5 o 4 Maintenance Calculation Sheet Measurement Accuracy Test 0 m 1000 pF Meas Time MED ALC OFF Frequency Signal Level Parameter 4268A Reading Test Result Measured a Equation 1 kHz 1000 mV Cp pF a CVl 1 kHz 1000 mV D a CV2 Measurement Accuracy Test 0 m 0 01 uF Meas Time MED ALC OFF Frequency Signal Level Parameter 4268A Reading Test Result Measured a Equation 120 Hz 1000 mV Cp nF a CV3 120 Hz 1000 mV D a CV4 1 kHz 1000 mV Cp nF a CV5 1 kHz 1000 mV D a CV6 Measurement Accuracy Test 0 m 0 11 F Meas Time
8. Signal Source Block Diagram Reference Oscillator 4268ASE05013 i ALC OFF 0 ALC ON Hpot Transducer The transducer section measures the vector voltage across the DUT and the current flowing through the DUT by converting the current to voltage Figure 4 9 shows the transducer block diagram The voltage across the DUT is measured at the Hpot and Lpot connectors using a differential amplifier The current flowing through the DUT and flowing into the Lcur connector is converted to voltage by an I V converter The differential amplifier measures the voltage between an I V converter output and the inverting input of the converter The inverting input of the converter thus Lc is at virtual ground because of the very high input impedance and very high open loop gain of the operational amplifier used in the I V converter The R1 is called range resistor The 4268A selects one of range resistors 100 uF range at 1 kHz and 1 mF range at 120 Hz are switched using a mechanical relay 86 Chapter 4 Troubleshooting Theory of Operation Figure 4 9 Transducer Block Diagram Contact Check 4268ASE05026 Detector The vector ratio detector section processes the two output voltages from the transducer section and converts these voltages into digital data Figure 4 10 shows the vector ratio detector bloc
9. 111 Fan Assembly Removal 112 Front Assembly Removal ii ERATZEN SAE AAS RY SERS Gb SERS SOLES 112 LCD Assembly Removal AAA 112 Keyboard Assembly Removal 113 BNC Connector Removal 113 EEPROM or Boot ROM Replacement 113 Post Replacement Procedure e da eurae gn 114 Firmware Installation aritz iso at pedal cheese IS ahaa EE NAA G 115 Required Controller s AAA 115 Installation Program and Firmware File 115 Firmware installation Procedure 115 O oO 4 y El e 3 D OO General Information The Service Manual is a guide to servicing the 4268A 120 Hz 1 kHz Capacitance Meter The manual contains information requisite to do performance test adjust troubleshoot and repair Figure 1 1 General Information Instruments Covered by This Manual Instruments Covered by This Manual Agilent Technologies uses a two part ten character serial number label See Figure attached to the instrument s rear panel The first five characters are the serial prefix and the last five digits are the suffix Serial Number Label Example Agilent Technologies Japan Ltd SER NO JP1KG12345 AK MADE IN JAPAN 33
10. Frequency Signal Parameter Test Limits Test Result Measurement Level Measured Uncertainty 120 Hz 500 mV Rs 0 0097 Q Q 0 00067 Q 1 kHz 500 mV Rs 0 0057 Q Q 0 00067 Q Measurement Accuracy Test 0 m 1 Q Meas Time MED ALC ON Frequency Signal Parameter Test Limits Test Result Measurement Level Measured Uncertainty 120 Hz 500 mV Rs 0 0097 Q Q 0 00067 Q 1 kHz 500 mV Rs 0 0057 Q Q 0 00067 Q 54 Chapter2 Maintenance Test Record Measurement Accuracy Test 1 m 1 LE Meas Time MED ALC OFF Frequency Signal Parameter Test Limits Test Result Measurement Level Measured Uncertainty 120 Hz 1000mV Cp 0 0020 uF uF 0 00021 uF 120 Hz 1000mV D 0 0020 0 00014 1k Hz 1000mV Cp 0 0018 uF uF 0 00021 uF 1k Hz 1000mV D 0 0018 0 00010 Measurement Accuracy Test 1 m 10 uF Meas Time MED ALC OFF Frequency Signal Parameter Test Limits Test Result Measurement Level Measured Uncertainty 120 Hz 1000mV Cp 0 020 uF uF 0 0021 uF 120 Hz 1000mV D 0 0020 0 00004 1 kHz 1000mV Cp 0 018 uF uF 0 0021 uF 1 kHz 1000mV D 0 0018 0 00004 Measurement Accuracy Test 2 m 1 LE Meas Time MED ALC OFF Frequency Signal Parameter Test Limits Test Result Measurement Level Measured Uncertainty 120 Hz 1000 mV Cp 0 0020 uF uF 0 00021 uF 120 H
11. GO Troubleshooting Trouble Isolation 76 Test the 4268A manually at the failed test point See Chapter 2 Maintenance If the test result is within the limit for raw analog circuit the adjustment data in EEPROM suppose to be defective Perform the adjustment The rough limits are followings Signal Level 15 of 4268A setting Level Monitor 10 of 4268A reading e Impedance Measurement 4 correction t 10 of 4268A reading after open short If the test result 1s out of the limit Al or cables between A1 and front panel s BNC connector suppose to be defective If all cables are normal replace Al assembly Chapter 4 Troubleshooting Service Function Service Function The service functions are used to test verify control and troubleshoot Firmware Revision Confirmation e Turn the 4268A off then turn it on again Immediately after turning the power on the firmware version and option information appear on the display Press the Config key blue key key use the Ta key to blink Rev and then press the Enter key Shift A ern Cp 22 567 uF D 0 0345 FREQ 1kHz Beep Sve Test Rev Exit LVL 1000mV Rn Short Ned Long Int Man Ext ALG Syne Hold Load Comprtr Cont Rmt Key Measurement Settings b On Source Range On On Chk Lock Meas Time b Trigger 42680301 Chapter 4 77 gt Q T D GO o y G e
12. If all test work correctly check pass into the function test record 40 Chapter 2 Maintenance Function Test Scanner Interface Test opt 001 only The 4268A s scanner interface function is tested using the built in self test and the scanner interface simulator Test Equipment Description Recommended Model Scanner Interface Simulator p n 04278 65301 N 36 Pin Cable p n 04278 61650 S a Part of the Handler Interface Simulator 2 a Procedure j 1 Turn the 4268A off 2 Confirm switches S1 and S3 on the 4268A A1 main board are the factory setting as shown in Figure 2 9 If they has been changed by customer set them to the factory setting NOTE Memorize the switch setting to reset them after this test if necessary 3 Set up the equipment as shown in Figure 2 13 Figure 2 13 Scanner Interface Test Setup Scanner Interface Simulator furnished cable To Scanner Interface HP 4268A Connector Scanner Interface Simulator To Handler Interface Connector 36PIN Cable 4268ase02012 Chapter 2 41 Maintenance Function Test 4 Set the jumper on the scanner interface simulator to 1 as shown in Figure 2 14 Figure 2 14 Scanner Interface Simulator Setting Scanner Interface Simulator CH VALID EOM 4268ase02013 5 Turn the 4268A on 6 Reset the 4268A 7 Start the
13. MED ALC OFF Frequency Signal Level Parameter 4268A Reading Test Result Measured a Equation 120 Hz 1000 mV Cp nF a CV7 120 Hz 1000 mV D a CV8 1 kHz 1000 mV Cp nF a CV9 1 kHz 1000 mV D a CV10 46 Chapter 2 Maintenance Calculation Sheet Measurement Accuracy Test 0 m 1 LE ALC OFF Frequency Signal Level Meas Parameter 4268A Reading Test Result Time Measured a Equation 120 Hz 1000 mV MED Cp uF a CV1l 120 Hz 1000 mV MED D a CV12 1 kHz 1000 mV MED Cp uF a CV13 1 kHz 1000 mV MED D a UN IA S 120 Hz 500 mV MED Cp uF a CV1l 120 Hz 500 mV MED D a Cv12 l 1 kHz 500 mV MED Cp uF a CV13 8 1 kHz 500 mV MED D a UN IA 120 Hz 300 mV MED Cp uF a CV1l 120 Hz 300 mV MED D a CV12 1 kHz 300 mV MED Cp uF a CV13 1 kHz 300 mV MED D a CV14 120 Hz 100 mV MED Cp uF a CV1l 120 Hz 100 mV MED D a CV12 1 kHz 100 mV MED Cp uF a CV13 1 kHz 100 mV MED D a CV14 120 Hz 1000 mV LONG Cp uF a CV1l 120 Hz 1000 mV LONG D a Cv12 1 kHz 1000 mV LONG Cp uF a CV13 1 kHz 1000 mV LONG D a UN IA 120 Hz 1000 mV SHORT Cp uF a CV1l 120 Hz 1000 mV SHORT D a CV12 1 kHz 1000 mV SHORT Cp uF a CV13 1 kHz 1000 mV SHORT D a CVvl4 Chapter 2 47 Maintenance Calculation Sheet Measurement Accuracy Test 0 m 1 uF Meas Time MED ALC OFF Sync Source Function ON
14. replace A2 assembly Al board test failed The Al board s ID is incorrect or the A D converter is not working properly Replace Al assembly Calibration memory lost The Factory Calibration Data in the EEPROM has been lost Perform the adjustment User data lost The User Correction Data in the EEPROM has been lost The correction data is initialized to the factory setting Previous setting lost The instrument setting values in the backup memory have been lost These value is initialized to the factory setting Possible causes include a lapse of 72 hours after power off gt Q T D ao o y G e on a Step 1 Step 2 Step 3 Step 4 Troubleshooting Service Function Front Panel Key Test Follow these steps to test the function of a front panel key Press the Config key blue key key Use the Ta key to blink Svc and then press the Enter key The service function menu below appears Shift Cp 22 567 uF D 0 0345 FREQ 1kHz KEY HNDL GUNE ROM RAM Exit LVL 1000mV Short Med Long Int bo Ext ALG Syno Hold Load Gomprtr Gont Rwt Key Measurement Settings gt Meas Time Trigger On Source Range On On Chk Look 42680411 Use the Ta key to blink KEY and then press the Enter key The front panel key test screen appears Press a key you want to test The name of the pressed key is displayed next to KEY TEST in the upper line of the display The following fi
15. 1 LED PRODUCT e Ground The Instrument To avoid electric shock hazard the instrument chassis and cabinet must be connected to a safety earth ground by the supplied power cable with earth blade DO NOT Operate In An Explosive Atmosphere Do not operate the instrument in the presence of flammable gasses or fumes Operation of any electrical instrument in such an environment constitutes a definite safety hazard Keep Away From Live Circuits Operating personnel must not remove instrument covers Component replacement and internal adjustments must be made by qualified maintenance personnel Do not replace components with the power cable connected Under certain conditions dangerous voltages may exist even with the power cable removed To avoid injuries always disconnect power and discharge circuits before touching them s DO NOT Service Or Adjust Alone Do not attempt internal service or adjustment unless another person capable of rendering first aid and resuscitation is present DO NOT Substitute Parts Or Modify Instrument Because of the danger of introducing additional hazards do not install substitute parts or perform unauthorized modifications to the instrument Return the instrument to a Agilent Technologies Sales and Service Office for service and repair to ensure that safety features are maintained Dangerous Procedure Warnings Warnings such as the example below precede potentially dangerous procedures througho
16. 56 3 Adjustment Required Controller aia ga 58 Windows PC Personal Computer 58 Required Equipment ue apela 58 Adjustment Programi ss 2 4260 egurrari evs Oh ein vag bee Oh agi oe es RE te dr 58 Program Installation rz gar guz dise dite ee rar gag ORAS Ree RRR eee 60 Running the Adjustment Program 60 Adjustment Procedure Reference 61 Signal Level AUS MENE sida rare lat la oor ae sen dit A 61 Signal Level Monitor Adjustment 63 Impedance Measurement Adjustment 64 4 Troubleshooting DO OORT E AE E o elea edade en bado daa 68 Contents Dale tytn tat A a tt A A dea Eb teka ka bd 68 UKO RARA EAK 68 Required Equipment spor dado ee edit taket duena ee Se ek See eS 68 Trouble Tsolationy lt erat ete Gz gun it a a e ern arr ees Se taiga 69 Overall Troubleshooting 69 Power Supply Troubleshooting 70 Digital Circuit Troubleshooting 73 Analog Circuit Troubleshooting 75 Service FUNCION sr nn li eik Grabatu nc M lease nes 77 Firmware Revision
17. An instrument manufactured after the printing date of this manual may have serial number prefix that is not listed on the title page This unlisted serial number prefix indicates the instrument is different from those described in this manual The manual for this new instrument may be accompanied by a yellow Manual Changes supplement or have a different manual part number This sheet contains change information that explains how to adapt the manual to the newer instrument In addition to change information the supplement may contain information for correcting errors Errata in the manual To keep this manual as current and accurate as possible Agilent Technologies recommends that you periodically request the latest Manual Changes supplement The supplement for this manual is identified by this manual s printing data and is available from Agilent Technologies If the serial prefix or number of an instrument is lower than that on the title page of this manual see Appendix A Manual Changes For information concerning a serial number prefix that is not listed on the title page or in the Manual change supplement contact the nearest Agilent Technologies office 10 Chapter 1 General Information Required Equipment o D o Ei a Required Equipment Table 1 1 lists the recommended equipment for performing maintenance on the S 4268A Table 1 1 Recommended Test
18. Description Designation Number Digit 1 04268 00211 1 1 Panel without Opt 001 0515 1550 0 2 Screw M3 L8 without Opt 001 04268 61605 5 1 Cable Assembly with Opt 001 0515 1551 1 2 Screw M3 L10 with Opt 001 2 0363 0125 0 3cmx2 Gasket 3 0515 1551 1 2 Screw M3 L10 4 04268 00111 0 1 Chassis 5 2190 0054 9 1 Washer 2950 0054 1 1 Nut 104 Chapter 5 Assembly Replacement Replaceable Parts List Side View Figure 5 10 4268ase07010 Table 5 10 Side View Description Trim Side Screw M3 Cover Foot Tilt Stand Qty 2 Check t igi D Agilent Part Number 5041 9170 0515 0914 04339 04004 5041 9167 1460 1345 Reference Designation 1 5 Assembly Replacement 105 Chapter 5 Assembly Replacement Replaceable Parts List Figure 5 11 A2 CPU Board 4268ase07011 Table 5 11 A2 CPU Board Reference Agilent Part Check Qty Description Designation Number Digit 1 04268 85031 1 1 Boot ROM 2 1818 7087 3 2 EEPROM 3 2110 1123 7 1 Fuse SMT 2A 125V 106 Chapter 5 WARNING CAUTION Assembly Replacement Disassembly Procedure Disassembly Procedure The opening of covers or removal of parts is l
19. Lo lo 4268ase07004 Table 5 4 Bottom View Reference Agilent Part Check Qty Description Designation Number Digit 1 5040 3347 5 2 Plate 0460 0616 0 35cmx2 Adhesive Tape 2 0515 1550 0 2 Screw M3 L 8 P H Chapter 5 99 pu D O O 3 A Quiassy C Figure 5 5 Assembly Replacement Replaceable Parts List 4268A Front Assembly 1 4 4268ase07005 Table 5 5 Front Assembly 1 4 Reference Agilent Part Check Qty Description Designation Number Digit 1 04263 40001 6 1 Front Frame 2 0515 0914 8 4 Screw M3 3 04268 87121 4 1 Label Front 4 1250 0252 6 4 Connector BNC 2950 0035 8 4 Nut Outer Side 5040 3324 8 4 Insulator Outer Side 5040 3325 9 4 Insulator Inner Side 04263 01221 0 4 Terminal Inner Side 5 1510 0130 1 1 Binding Post 2190 0067 4 1 Washer Inner Side 2950 0006 3 1 Nut Inner Side 6 04263 00605 2 1 Sub Panel 100 Chapter5 Figure 5 6 Front Assembly 2 4 Assembly Replacement Replaceable Parts List gt dla gi Uh L 4268ase07006 Table 5 6 Front Assembly 2 4 Reference Agilent Part Check Qty Description Designation Number Digit 1 0160 4808 4 4 Capacitor 470 pF 2 1901 1250 7 8 Diode Chapter 5 101 pu D O O 3 ei A Quiassy TO Assembly Replacement
20. ROM Verifies that the checksum of Flash ROM is correct 4 Calibration Verifies that the checksum of the adjustment data in the 8 data EEPROM is correct User Verifies that the checksum of the OPEN SHORT LOAD 16 correction correction data in the EEPROM is correct Even if the test data fails the correction data is not initialized Al main Verifies that the board ID of the Al main board analog 32 board board is correct and that the A D converter operates normally Backup RAM Verifies that the instrument setting value in the backup 64 memory RAM is correct Even if the test fails the instrument setting value is not initialized 78 Chapter 4 Troubleshooting Service Function Power On Self test This test is executed when the 4268A is turned on This test performs the following brief checks of the operation including memory This test is executed at power on Chapter 4 79 RAM test failed The RAM data bus or the address bus is NOT connected correctly Replace A2 assembly Boot ROM test failed The BOOT ROM check sum is invalid If only the Boot ROM is failed replace the BOOT ROM If other test failed replace A2 assembly Flash ROM test failed The Flash ROM check sum is invalid Install firmware to the Flash ROM If 4268A still fails replace A2 assembly EEPROM test failed Read Writing EEPROM is not performing correctly If only the EEPROM test failed replace EEPROM and perform the adjustment If other test failed
21. function is on Chapter 2 47 NOTE Maintenance Performance Test Performance Test Introduction This section provides the test procedures used to verify that the 4268A s specifications are met The performance tests can also be used for incoming inspection and for verification after troubleshooting or adjustment If the performance tests indicate that the 4268A is NOT operating within the specified limits check your test setup then proceed with troubleshooting if necessary Warm Up Time Allow the 4268A to warm up for at least 30 minutes before you execute any of the performance tests Ambient Conditions Perform all performance tests in ambient conditions of 23 C 5 C lt 70 RH Performance Test Interval The performance test should be performed periodically The recommended test interval is 12 months The test interval depends on maintenance of use and the environmental conditions under which the instrument is used You may find that the test interval could be shortened or lengthened however such a decision should be based on substantial quantitative data Performance Test Record and Calculation Sheet Performance test record lists all test points acceptable test limits test result entry columns and measurement uncertainties The listed measurement uncertainties are valid only when the recommended test equipment is used The calculation sheet is used as an aid for recording raw measurement da
22. generates an ac signal of which frequency and level is set from the front panel or by GPIB commands The signal is applied to the DUT via the High Current Hcur connector The current flowing through the DUT is current sunk into the Low Current Lcur connector which serves as virtual ground gt y Q T D ao o y G e on a The vector voltage across the DUT is detected by the voltage between High Potential Hpot and Low Potential Lpot connectors The vector current flowing through the DUT is detected by converting the current flowing into Lcur connector to a corresponding voltage using an I V converter One of the two outputs from the transducer is selected in the vector ratio detector by switch SW2 The selected signal is processed according to measurement conditions such as measurement time and measurement range and is converted into digital data by the Analog to Digital Converter ADC Chapter 4 85 Figure 4 8 E Troubleshooting Theory of Operation Signal Source The signal source section generates ac signal The signal frequency can be selected from 120 Hz and 1 kHz The signal level can be set from 100 mV to 1000 mV by 10 mV step The auto level control ALC function is designed to apply the voltage to the DUT correctly When DUT has very low impedance the applied voltage might decrease due to the output resistance of the voltage source and the resistance of the measurement cable
23. instrument The servicing procedures described herein are performed when power is supplied to the instrument and its protective covers are removed This type of servicing must be performed only by service trained personnel who are aware of the hazards involved for example fire and electrical shock When serving can be performed without power applied to the instrument remove power from the instrument Before any repair is completed ensure that all safety features are intact and functioning and that all necessary parts are properly connected to the protective grounding system ESD Precautions When using any of the procedures in this chapter you should use proper ESD precautions As a minimum you should place the instrument on a properly grounded ESD mat and wear a properly grounded ESD wrist strap Required Equipment The required equipment is listed on Table on page 11 for troubleshooting 68 Chapter 4 Figure 4 1 Troubleshooting Trouble Isolation Trouble Isolation Overall Troubleshooting Figure 4 1 shows the overall troubleshooting flowchart to isolate a defect assembly Follow the flowchart for trouble isolation Flowchart Overall Troubleshooting Start Turn HP 4268A Power on Power Supply LCD Erroris Digital Trouble Isolation doesn t light displayed Trouble Isolation 4268ASE05021 Analog Trouble Isolation Check1 LCD Check 1 Turn the 4268A off then turn the 4268A on while watching the LCD 2 Ch
24. mV LONG D 0 0020 0 00004 1 kHz 1000 mV LONG Cp 0 0018 pF pF 0 00021 pF 1 kHz 1000 mV LONG D 0 0018 0 00002 120 Hz 1000 mV SHORT Cp 0 0036 pF pF 0 00021 pF 120 Hz 1000 mV SHORT D 0 0036 0 00004 1 kHz 1000 mV SHORT Cp 0 0022 pF pF 0 00021 pF 1 kHz 1000 mV SHORT D 0 0022 0 00002 Measurement Accuracy Test 0 m 1 pF Meas Time MED ALC OFF Sync Source Function ON Frequency dedi dde Test Limits Test Result Gea 120 Hz 1000 mV Cp 0 0020 pF pF 0 00021 pF 120 Hz 1000 mV D 0 0020 0 00004 1 kHz 1000 mV Cp 0 0018 pF pF 0 00021 pF 1 kHz 1000 mV D 0 0018 0 00002 Measurement Accuracy Test 0 m 100 Q Meas Time MED ALC OFF Frequency de Ge Test Limits Test Result C 120 Hz 1000 mV Rs 0 20 Q Q 0 006 Q Measurement Accuracy Test 0 m 10 Q Meas Time MED ALC OFF Frequency de Ge Test Limits Test Result Geak 120 Hz 1000 mV Rs 0 044 Q Q 0 0006 Q 1 kHz 1000 mV Rs 0 018 Q Q 0 0006 Q Measurement Accuracy Test 0 m 1 Q Meas Time MED ALC OFF Frequency E dde Test Limits Test Result Ede 120 Hz 500 mV Rs 0 0097 Q Q 0 0001 Q 1 kHz 500 mV Rs 0 0057 Q Q 0 0001 Q Copyright 2009 Agilent Technologies Measurement Accuracy Test 0 m 1 Meas Time MED ALC ON Signal Parameter EE Measurement Frequency Level Measured Test Limits Test R
25. menu vary depending on the selected primary parameter The following example shows the display when Cp is selected Shift Cp 22 567 u F D 0 0345 FREQ 1kHz Sec Prmtr D Q G Rp LVL 1000mV L 7 ke Short Med Long Int Man Ext ALC Syne Hold Load Comprtr Cont Rmt c agirie Stines gt Meas Tine Source Range On On Chk Key Trigger On Look 42680309 Chapter 2 15 Step 1 Step 2 Step 1 Step 2 Step 1 Step 2 Maintenance How to set the 4268A for the Maintenance Frequency Setting Press the Freq key The menu as shown below appears Shift Cp 22 567 u F D 0 0345 FREQ 1kHz Freq 120Hz 1kHz LVL 1000mV Short Med Long Int Man Ext ALG Sync Hold Load Gomprtr Gont Rmt Key Measurement Settings a leas Ti E Trigger A On Source Range On On Chk Lock 42680305 The blinking frequency is the current setting To change the setting press the Ta key or press the Freq key again to blink the measurement frequency 120 Hz or 1 kHz you want to set and press the Enter key Signal Level Setting Press the Level key The menu as shown below appears Shift Leve 1000mV LVL 1000mV de 3 Short Med Long int an Ext ALG Syno Hold Load Gomprtr Gont Rwt Key Measurement Settings as Time pa Trigger On Source Range On On Chk Lod Cp 22 567 uF D 0 0345 FREQ 1kHz 42680306 Using num
26. on O Step 1 Step 2 Step 3 NOTE Table 4 1 Troubleshooting Service Function Self Test The 4268A provides a self test function The self test performs brief checks of the operation of digital parts including memory Press the Config key blue key key The menu as shown below appears Shift f Beep Cp 22 567 uF D 0 0345 Rev FREQ Sve Test Exit LVL 1000mV 1kHz Short Med Long Meas Tim x Int Wan Ext ALG Syno Hold Load Gomprtr Gont Rmt i 2 Chk Getze On Source Range On Lock 42680301 Key Measurement Settings Use the T a key to blink Test and then press the Enter key The SELF TESTING message appears and the self test is executed When the test is completed SELF TEST PASS is displayed for approximately 1 second if an error occurs its error number is displayed For details on displayed error number refer to Table 4 1 and then the menu in Step 1 appears Check that Exit is blinking if not operate keys to blink Exit and then press the Enter key to exit from the menu If several errors are detected at one time the sum of their error numbers is displayed Self test Items Test item Test description Error code RAM Verifies that the RAM data bus is connected correctly and 1 there is no faulty memory cell Boot ROM Verifies that the checksum of Boot ROM is correct 2 Flash
27. scanner interface output test with the following procedure a Press the Config key Blue key key to display the configuration setting menu b Select Sve using ek or P gt and press Enter c Select SCNR using lt or P gt and press Enter 8 Confirm that the LEDs on the scanner interface simulator light in the order shown in Figure 2 15 in accordance with the 4268A display Figure 2 15 Scanner Interface Output Order 00 0 Or WE E gt lt LLI INDEX O O l lt gt I O 4268ase02011 42 Chapter 2 Maintenance Function Test NOTE Generally when CHn LED light CH 2 is displayed on the 4268A s LCD However when CH6 or CH7 LED light CH 0 is displayed 9 If the 4268A test work correctly check pass onto the function test record D z D 5 2 4 5 D 5 o 4 Chapter 2 43 Maintenance Calculation Sheet Calculation Sheet Performance Test Frequency Accuracy Test Frequency Counter Reading Test Result Equation a 120 Hz Hz a 120 0 Hz 1 kHz kHz a 1 00000 kHz Signal Level Accuracy Test Frequency Signal Level Multimeter Reading Test Result Equation a 120 Hz 1000 mV V a 1 00 x 1000 mV 120 Hz 500 mV V a 0 500 x 1000 mV 120 Hz 100 mV V a 0 100 x 1000 mV 1 kHz 1000 mV V a 1 00 x 1000 mV 1 kHz 500 mV V Ca 0 500 x 1000 mV 1 kHz 100 mV V a 0 100 x 1000 mV 44
28. y G e on O Step 1 Step 2 Step 3 Step 4 Step 5 Troubleshooting Service Function EEPROM Test Verifies that the EEPROM data bus is connected correctly and there is no faulty memory cell Turn the 4268A off Then while pressing the ek key turn the 4268A on Cp 22 567 u F D 0 0345 FREQ 1kHz d LVL 1000mV 4268ase05001 Press the Config key blue key key Use the Ta key to blink Svc and then press the Enter key Shift Cp 22 567 uF D 0 0345 FREQ kHz KEY HNDL SCNR ROM RAM SPCL LVL 1000mV 4268ase05002 Confirm that SPCL is blinking and then press the Enter key Cp 22 567 uF D 0 0345 FREQ 1kHz EEPROM LvlCal ImpCal MonCal LVL 1000mV 4268ase05003 Confirm that EEPROM is blinking and then press the Enter key PASS or FAIL is displayed next to EEPROM TEST in the upper line of the display To return the upper menu press the Cancel key blue key BkSp key 82 Chapter 4 Troubleshooting Service Function Adjustment Data Setting Set the adjustment data status in EEPROM to activated or not Step 1 Turn the 4268A off Then while pressing the ek key turn the 4268A on Shift Cp 22 567 uF D 0 0345 FREQ 1kHz d LVL 1000mV Short Ned Long Int Man Ext ALG Syne Hold Load Comprtr Cont Rmt Key Measurement Settings f ea zea Trigg On Source Range
29. 0020 uF uF 0 00021 uF 120 Hz 1000 mV LONG D 0 0020 0 00004 1 kHz 1000 mV LONG Cp 0 0018 uF uF 0 00021 uF 1 kHz 1000 mV LONG D 0 0018 0 00003 120 Hz 1000 mV SHORT Cp 0 0036 uF uF 0 00022 uF 120 Hz 1000 mV SHORT D 0 0036 0 00009 1 kHz 1000 mV SHORT Cp 0 0022 uF uF 0 00021 uF 1 kHz 1000 mV SHORT D 0 0022 0 00005 Chapter 2 53 D z D 5 2 4 5 D 5 o 4 Maintenance Test Record Measurement Accuracy Test 0 m 1 uF Meas Time MED ALC OFF Sync Source Function ON Frequency Signal Parameter Test Limits Test Result Measurement Level Measured Uncertainty 120 Hz 1000 mV Cp 0 0020 uF uF 0 00021 uF 120 Hz 1000mV D 0 0020 0 00004 1 kHz 1000 mV Cp 0 0018 uF uF 0 00021 uF 1 kHz 1000mV D 0 0018 0 00004 Measurement Accuracy Test 0 m 100 Q Meas Time MED ALC OFF Frequency Signal Parameter Test Limits Test Result Measurement Level Measured Uncertainty 120 Hz 1000 mV Rs 0 20 Q Q 0 015 Q Measurement Accuracy Test 0 m 10 O Meas Time MED ALC OFF Frequency Signal Parameter Test Limits Test Result Measurement Level Measured Uncertainty 120 Hz 1000 mV Rs 0 044 Q Q 0 0021 Q 1 kHz 1000mV Rs 0 018 Q Q 0 0021 Q Measurement Accuracy Test 0 m 1 Meas Time MED ALC OFF
30. 02 1 kHz 1000 mV Cp 0 018 nF nF 0 0021 nF 1 kHz 1000 mV D 0 0018 0 00004 Measurement Accuracy Test 0 m 0 1 uF Meas Time MED ALC OFF Frequency Signal Parameter Test Limits Test Result Measurement Level Measured Uncertainty 120 Hz 1000 mV Cp 0 18 nF nF 0 021 nF 120 Hz 1000 mV D 0 0018 0 00003 1 kHz 1000 mV Cp 0 18 nF nF 0 021 nF 1 kHz 1000 mV D 0 0018 0 00003 52 Chapter 2 Measurement Accuracy Test 0 m 1 LF ALC OFF Maintenance Test Record Frequency Signal Meas Parameter Test Limits Test Result Measurement Level Time Measured Uncertainty 120 Hz 1000 mV MED Cp 0 0020 uF uF 0 00021 uF 120 Hz 1000 mV MED D 0 0020 0 00004 1 kHz 1000 mV MED Cp 0 0018 uF uF 0 00021 uF 1 kHz 1000 mV MED D 0 0018 0 00003 120 Hz 500 mV MED Cp 0 0020 uF uF 0 00021 uF 120 Hz 500 mV MED D 0 0020 0 00004 1 kHz 500 mV MED Cp 0 0018 uF uF 0 00021 uF 1 kHz 500 mV MED D 0 0018 0 00004 120 Hz 300 mV MED Cp 0 0020 uF uF 0 00021 uF 120 Hz 300 mV MED D 0 0020 0 00005 1 kHz 300 mV MED Cp 0 0018 uF uF 0 00021 uF 1 kHz 300 mV MED D 0 0018 0 00003 120 Hz 100 mV MED Cp 0 0027 uF uF 0 00023 uF 120 Hz 100 mV MED D 0 0027 0 00009 1 kHz 100 mV MED Cp 0 0025 uF uF 0 00022 uF 1 kHz 100 mV MED D 0 0025 0 00005 120 Hz 1000 mV LONG Cp 0
31. 3 1 kHz 1000 mV D a CV14 Measurement Accuracy Test 1 m 10 uF Meas Time MED ALC OFF Frequency Signal Level Parameter 4268A Reading Test Result Measured a Equation 120 Hz 1000 mV Cp uF a CV15 120 Hz 1000 mV D a CV16 1 kHz 1000 mV Cp uF a UNI 1 kHz 1000 mV D a CV18 Measurement Accuracy Test 2 m 1 LE Meas Time MED ALC OFF Frequency Signal Level Parameter 4268A Reading Test Result Measured a Equation 120 Hz 1000 mV Cp uF a CVII 120 Hz 1000 mV D a CV12 1 kHz 1000 mV Cp uF a CV13 1 kHz 1000 mV D a CV14 Chapter 2 49 N z D 5 2 4 5 D 5 o 4 Maintenance Calculation Sheet Function Test Level Monitor Test Frequency Signal Meas Multimeter 4268A Voltage Test Result Test Level Time Reading x Monitor x y Limits Reading y 120 Hz 1000 mV MED mV mV mV 22 mV 120 Hz 1000 mV SHORT mV mV mV 22 mV 120 Hz 500 mV SHORT mV mV mV 12mV 120 Hz 300 mV SHORT mV mV mV 8mV 120 Hz 100 mV SHORT mV mV mV 4mV 1 kHz 1000 mV SHORT mV mV mV 22 mV 1 kHz 500 mV SHORT mV mV mV 12mV 1 kHz 300 mV SHORT mV mV mV 8mV 1 kHz 100 mV SHORT mV mV mV 4mV ALC Function Test Frequency Range Voltage Monitor Voltage Monitor Test Limit Output Test Limit Reading OPEN Reading 1Q lower Imedance upper x y 120 Hz 1 mF mV mV 0 00 Q 0 10 Q 1 kHz 100 u
32. A s measurement time mode to LONG Set the measurement parameters to Cs Rs Set the 4268A s trigger mode to manual Activate the 4268A s voltage monitor with the following procedure a Press the Level Mon key blue key ShowSetting key b Select Vmon using 44 or P gt and press the Enter key Set the measurement range to 1 mF by using the following procedure a Press the Range Setup key blue key Auto Hold key b Select 1 mF using ek or P gt and press Enter Activate the ALC function 10 Connect the OPEN termination as shown in Figure 2 7 Chapter 2 33 Maintenance Function Test Figure 2 7 ALC Function Test Setup HP 4268A 00 o oonbDlvodo l t HP 42090A OPEN HP 42030A Termination Standard Resistors 4268ASE02009 11 Press Trig key to start the measurement 12 Record the voltage monitor reading on the calculation sheet 13 Disconnect the OPEN termination and connect the 1 Q standard resistor 14 Press Trig key to start the measurement 15 Record the voltage monitor reading on the calculation sheet 16 Calculate the output impedance according to the calculation sheet 17 Set the measurement frequency to 1 kHz and the measurement range to 100 pF 18 Perform step 9 to 13 19 If all test results are in the test limits check pass int
33. Agilent 4268A 120HZ 1KHZ CAPACITANCE METER Service Manual Manual Change Agilent Part No N A Apr 2009 Change 1 Change the Measurement Uncertainty value of Frequency Accuracy Test Page 51 to the following Frequency Test Limits Test Result Measurement Uncertainty 120 Hz 1 2Hz Hz 0 024Hz 1kHz 0 50Hz Hz 0 20Hz Change 2 Change the Measurement Uncertainty value of Signal Level Accuracy Test Page 51 to the following Frequency Signal Level Test Limits Test Result Measurement Uncertainty 120 Hz 1000mV 100mV V 0 11mV 120 Hz 500mV 50mV V 0 066mV 120 Hz 100mV 10mV V 0 011mV 1kHz 1000mV 100mV V 0 11mV 1kHz 500mV 50mV V 0 066mV 1kHz 100mV 10mV V 0 011mV Copyright 2009 Agilent Technologies Change 3 Change the Measurement Uncertainty value of Measurement Accuracy Test Page 52 55 to the following Measurement Accuracy Test 0 m 1000 pF Meas Time MED ALC OFF Signal Parameter gie Measurement Frequency Level Mars Test Limits Test Result Uncatiainty 1 kHz 1000 mV Cp 1 9 pF pF 0 19 pF 1 kHz 1000 mV D 0 0019 0 00002 Measurement Accuracy Test 0 m 0 01 pF Meas Time MED ALC OFF Signal Parameter us Measurement Frequency Level Measured Test Limits Test Result acorta 120 Hz 1000 mV Cp 0 019 nF nF 0 0021 nF 120 Hz 1000 mV D 0 0019 0 00002 1 k
34. Confirmation 77 EURE aaa dekoa EO EA EE E ra Ea EEE AE iatera 78 Power On Selt test iia Axel ee Se a A He ee A TE pizar 79 Front Panel Key E dle 80 Handler Interface Testo heey Boe Bh nica te ORE Ra Rs ee EL ES 80 Scanner Interface Test Opt ALO KUMA 80 ROM TS oes tat et oo de dances de ado te 81 RAM Testi a lid sl EEPROM Ti A a a 82 Adjustment DAA AO Ge data e ae er gata dati ua E 83 Theory of Operation E atte id Ri i E Sn ee are Ge get eta 84 Overall Measurement Theory 84 A alog Circuits rarene ety ed wake ep ENE ae geiak Legian ci rae aa da 84 EGORA E Geog Stark E aa aa E A are tea E a EEE e 88 Power Supply Circuit etu gata taki A i CG RE 89 5 Assembly Replacement Safety cst cou ee dee Pues ea do E ena ca Shoe ai er d 92 ESD Precautions fra a A HME a eR hs ey head goo E a te da ae 92 Replaceable Parts List8 vot Ko A nw dle gly aere dr egien aie ae eek 92 Ordering Information i 92 Exchange GST RE Ea ETE AE EE EEE ES e Er EEK EEE EEREN EEE R I 92 Parts E a m ne heb abd cae seek MRR SUE MLS Ap aud aslo dees ba pana de hanes 94 Disassembly Proc dure ga sgt d dede annees Edu Ep ge de det auzen diri owe als pw ae Zo 107 Cover Removal iii in be RR bE a ES Gee eee 107 AT Main Board Removal KAE 107 A2 CPU Board Replacement arrat cea num ta 109 Power Supply Assembly Removal
35. E 00000000000 Z J12 J11 ERIEN GO Sl GO Q b KO 4 Confirm the LEDs on the handler interface simulator as shown in Figure 2 12 on page 39 is mounted If all LEDs is not mounted add LEDs Agilent P N Chapter 2 37 Maintenance Function Test 1990 0486 5 Set up the equipment as shown in Figure 2 10 Figure 2 10 Handler Interface Test Setup Handler Interface Simulator HP 4268A To Handler Interface Connector l OODODO 000000 o dooo aolooco lt oboboloooo d Handler Interface Tester furnished Cable 4268ase02005 6 Set START STOP CH RESET KEYLOCK Switch as shown in Figure 2 11 Figure 2 11 Handler Interface Simulator Handler Interface Simulator STAR TSTOR E START STOP CH RESET a KEY LOCK 4268ase02010 7 Turn the 4268A on 8 Reset the 4268A 9 Confirm EOM INDEX and CH2 light The location are shown in Figure 2 12 on page 39 Handler Interface Output Test 10 Start the handler interface output test with the following procedure a Press the Config key Blue key key to display the configuration setting menu b Select Sve using ek or P gt and press Enter 38 Chapter 2 Figure 2 12 4268ase02006
36. Equipment Equipment Critical specifications Recommended Model Qty Use Frequency Counter Frequency 120 Hz to 100 kHz 3458A 1 P Accuracy lt 0 01 Voltmeter Frequency DC to 1 kHz 3458A 1 PA T Voltage Range 100 mV js to 1 Vims Accuracy lt 0 5 Standard Resistor Set No Substitute 42030A 1 BEA Standard Capacitor Set No Substitute 16380A 1 P Standard Capacitor Set No Substitute 16380C Opt 001 1 P OPEN Termination No Substitute 42090A 1 PEA SHORT Termination No Substitute 420914 1 PA 1 m Test Leads No Substitute 16048A 1 BEA 2 m Test Leads No Substitute 16048D 1 P A Adaptor BNC f BNC f p n 1250 0080 4 PBA Adaptor Dual Banana BNC f p n 1251 2277 1 P F A T Cable 61 cm BNC m BNC m p n 8120 1839 1 BEAT Interface Box No substitute p n 04284 65007 1 EA Handler Interface No Substitute p n 04278 65001 1 F Simulator Scanner Interface No Substitute p n 04278 65301 1 F Simulator a P Performance Tests F Function Tests A Adjustment T Troubleshooting Chapter 1 11 General Information Required Equipment 12 Chapter 1 N z D 3 a 4 5 o 3 o 4 Maintenance This chapter provides information on how to maintain the 4268A The maintenance consists of performance test and function test 13 Maintenance Test Equipment Test Equipment The required test equipment is listed on Table 1 1 on page 11 Use only calibrated equipment when adjusting the 4268A 14 Chapter 2 Step 1 Step 2 Step 1 St
37. F mV mV 0 00 Q Q 0 10 Q a 1x x y y 50 Chapter 2 Test Record 4268A 120 Hz 1 kHz Capacitance Meter Maintenance Test Record Serial Number Temperature Date Humidity Tested by Performance Test Record Frequency Accuracy Test Frequency Test Limits Test Result Measurement Uncertainty 120 Hz 1 2 Hz Hz 0 014 Hz 1 kHz 0 50 Hz Hz 0 12 Hz Signal Level Accuracy Test Frequency Signal Level Test Limits Test Result Measurement Uncertainty 120 Hz 1000 mV 100 mV mV 0 11 mV 120 Hz 500 mV 50 mV mV 0 065 mV 120 Hz 100 mV 10mV mV 0 011 mV 1 kHz 1000 mV 100 mV mV 0 11 mV 1 kHz 500 mV 50 mV mV 0 065 mV 1 kHz 100 mV 10 mV mV 0 011 mV Chapter 2 51 D BK 5 2 4 5 D 5 o 4 Maintenance Test Record Measurement Accuracy Test 0 m 1000 pF Meas Time MED ALC OFF Frequency Signal Parameter Test Limits Test Result Measurement Level Measured Uncertainty 1 kHz 1000 mV Cp 1 9 pF pF 0 18 pF 1 kHz 1000 mV D 0 0019 0 00003 Measurement Accuracy Test 0 m 0 01 uF Meas Time MED ALC OFF Frequency Signal Parameter Test Limits Test Result Measurement Level Measured Uncertainty 120 Hz 1000 mV Cp 0 019 nF nF 0 0021 nF 120 Hz 1000 mV D 0 0019 0 000
38. Hz 1000 mV Cp 0 018 nF nF 0 0021 nF 1 kHz 1000 mV D 0 0018 0 00002 Measurement Accuracy Test 0 m 0 1 uF Meas Time MED ALC OFF Signal Parameter ae Measurement Frequency Level Measured Test Limits Test Result DETE 120 Hz 1000 mV Cp 0 18 nF nF 0 021 nF 120 Hz 1000 mV D 0 0018 0 00003 1 kHz 1000 mV Cp 0 18 nF nF 0 021 nF 1 kHz 1000 mV D 0 0018 0 00002 Copyright 2009 Agilent Technologies Measurement Accuracy Test 0 m 1 pF ALC OFF Ge Signal Level Ga teek Test Limits Test Result eez z 120 Hz 1000 mV MED Cp 0 0020 pF pF 0 00021 pF 120 Hz 1000 mV MED D 0 0020 0 00004 1 kHz 1000 mV MED Cp 0 0018 pF pF 0 00021 pF 1 kHz 1000 mV MED D 0 0018 0 00002 120 Hz 500 mV MED Cp 0 0020 pF pF 0 00021 pF 120 Hz 500 mV MED D 0 0020 0 00004 1 kHz 500 mV MED Cp 0 0018 pF pF 0 00021 pF 1 kHz 500 mV MED D 0 0018 0 00002 120 Hz 300 mV MED Cp 0 0020 pF pF 0 00021 pF 120 Hz 300 mV MED D 0 0020 0 00004 1 kHz 300 mV MED Cp 0 0018 pF pF 0 00021 pF 1 kHz 300 mV MED D 0 0018 0 00002 120 Hz 100 mV MED Cp 0 0027 pF pF 0 00021 pF 120 Hz 100 mV MED D 0 0027 0 00004 1 kHz 100 mV MED Cp 0 0025 pF pF 0 00021 pF 1 kHz 100 mV MED D 0 0025 0 00002 120 Hz 1000 mV LONG Cp 0 0020 pF pF 0 00021 pF 120 Hz 1000
39. If BOOTROM REV xx xx and Waiting DOWNLOAD are displayed on the 4268A display the firmware installation is prepared 3 Run the firmrware installing program or the adjustment program 4 In the program enter a file name of the firmware file with directory 5 After Cycle Power to RUN is displayed on the 4268A turn the 4268A off and on 6 Confirm the firmware revision on the 4268A s display An error E20 Previous setting lost might be displayed on the 4268A during the power on If the error isn t displayed after next power on testing it s normal A Quiassy C pu D O O 3 Chapter 5 115 Assembly Replacement Firmware Installation 116 Chapter 5 REGIONAL SALES AND SUPPORT OFFICES For more information about Agilent Technologies test and measurement products applications services and for a current sales office listing visit our web site http www agilent com find tmdir You can also contact one of the following centers and ask for a test and measurement sales representative 11 29 99 United States fax 61 3 9272 0749 Agilent Technologies tel 0 800 738 378 New Zealand Test and Measurement Call Center fax 64 4 802 6881 P O Box 4026 Englewood CO 80155 4026 Asia Pacific tel 1 800 452 4844 Agilent Technologies 24 F Cityplaza One 1111 King s Road Canada Taikoo Shing Hong Kong Agilent Technologies Canada Inc tel 852 3197 7777 5150 Spectru
40. LNIg N4v1v O 2NI4 Maintenance Function Test c Select HNDL using ek or and press Enter 11 Confirm that the LEDs on the handler interface simulator light in the order shown in Figure 2 12 in accordance with the 4268A display LEDs of the Handler Interface Simulator D D 5 4 5 D 5 o 4 IHd Old rays W03 L H9 O Z HO O H9 O SU O eNla EIO SNI9 9NI4 ZNIa 8NI4 6NIa Old LO PE AIS xnv B ON 6 ON Twann XSQNI Q C o TT w 2 p Always OFF x Printed letters may be different 12 Exit from the test mode by selecting Exit External Trigger Function Test 13 Set the trigger mode to External 14 Set the comparator ON with the following procedure a Press Comprtr key blue key 1 key to display the comparator setting menu b Select On Off using EY or P gt and press Enter c Select On using Y or and press Enter 15 Press blue key MeasTime key 5 0 Enter key to set the average to 50 16 Set the START STOP switch on the simulator to STOP then return to START 17 Confirm the CH 1 to 4 take turns at lighting Key Lock Function Test 18 Set the trigger mode to Manual 19 Set the KEYLOCK switch on the handler interface simulator to on 20 Confirm that the all keys on the 4268A s front panel are locked out 21 Set the KEYLOCK switch on the handler interface simulator to OFF Chapter 2 39 Maintenance Function Test Record the result 22
41. On On Chk Look 4268ase05001 Step 2 Press the Config key blue key key Use the T a key to blink Svc and then press the Enter key Cp 22 567 uF D 0 0345 FREQ 1kHz KEY HNDL SCNR ROM RAM SPCL LVL 1000mV 4268ase05002 Step 3 Confirm that SPCL is blinking and then press the Enter key Shift Cp 22 567 uF D 0 0345 FREQ 1kHz EEPROM LvlCal ImpGal MonCal LVL 1000mV 4268ase05003 Step 4 To select proper adjustment data use the ek key or the t gt key to blink LvICal ImpCal or MonCal and then press the Enter key Step 5 Select On or Off using the ek key or the 1 gt key then press the Enter key e On Adjustment data in EEPROM is used for the 4268A measurement Default Off Adjustment data in EEPROM is canceled temporary Raw analog characteristic of the 4268A will behave gt y Q T D ao o y G e on a Chapter 4 83 Figure 4 6 4268ASE05025 Troubleshooting Theory of Operation Theory of Operation This section describes the general overall operation of the 4268A and the operation of each assembly Overall Measurement Theory The 4268A measures the impedance of the Device Under Test DUT by measuring vector voltage to current ratio A vector is a value which consists of a magnitude and a phase The impedance of the DUT is determined by the vector ratio between the voltage across the DUT and the current
42. adjust the actual signal level to the set value Equipment Description Recommended Model Multimeter 3458A Interface Box p n 04284 65007 61 cm BNC m BNC m Cable p n 8120 1839 Dual Banana BNC f Adapter p n 1251 2277 Setup Perform the following steps as the program instructs 1 2 3 Connect the interface box to the 4268A UNKOWN terminal Connect the Dual Banana BNC f Adapter to the BNC m BNC m Cable Connect the Dual Banana BNC f Adapter to the 3458A s INPUT binding posts Connect another end of the BNC m BNC m Cable to the interface box s TEST SIGNAL connector Signal Level Monitor Adjustment Setup Dual Banana to Multimeter BNC f Adapter HP 4268A DID DOD oojo000 0000 agjcooa 4268ASE02008 Chapter 3 63 pooboloooo b Interface Box TEST SIGNAL 61cm BNC m BNC m Cable gt 2 c a GO 3 4 5 Figure 3 4 4268ASE03001 Adjustment Adjustment Procedure Reference Impedance Measurement Adjustment This adjustment updates the impedance measurement adjustment data stored in the EEPROM Equipment Description Recommended Model Standard Resistor Set 42030A Test Leads 1m 16048A Test Leads 2m 16048D OPEN Termination 42090A SHORT Termination 42091A BNC f BNC f Adapter p n 1250 0080 Setup Perform the followi
43. asuremen Adj SHORT 0m measurement impedance to the standard s t Adjustment Adj OPEN Im value for no test cable 1m 2m test cable Adj SHORT 1m Adj OPEN 2m Adj SHORT 2m Adj GAMMA Chapter 3 59 Adjustment Adjustment Program Program Installation 1 Make a copy of the 4268A adjustment and performance test program named adj4268a exe in a directory of your hard disk drive 2 Double click the filename on the Windows Explorer to start extracting the self extracting the self extracting archive 3 You will be prompted to enter directory name for installing the program files Click Unzip to use default directory C 4268a 4 Confirm the message that you successfully extract the files and click OK and CLOSE Running the Adjustment Program 1 Start the Agilent VEE 2 Load the adjustment program file into the Agilent VEE as follows a Full down the file menu from the Agilent VEE window and select Open b Select C 4268A 4268AADJ VEE and select Open 3 You may be asked to add drivers for the equipment during the program loading Click OK and enter the address for each equipment Table 3 2 Device name and GPIB address example Device Name Equipment GPIB address 4268A 4268A 717 3458A Multimeter 722 RS232 not used 0 4 Select Start button on the Agilent VEE screen 5 Follow the instructions shown on the display 60 Chapter 3 Adjustment Adjustment Procedure Reference Adjustm
44. ccuracy Test 2 m Setup HP 4268A E Jj DD 0000 000000 a 0000000000 e0009 _ o0000rr00 I L HP 16048D 2m Test Leads B A R BNC f BNC f Adapter i HP 42090A HP 42091A OPE SHORT HP 16380C Termination Termination Standard Capacitors 48 Press the Open key blue key 4 key to display the OPEN correction menu 49 Select OpenMeas using ek or key and press Enter The OPEN correction is performed 50 Connect the SHORT termination to the 4268A s UNKNOWN terminals 51 Press the Short key blue key 5 key to display the SHORT correction menu 52 Select ShortMeas using 4 or key and press Enter The SHORT correction is performed 53 Set the 4268A frequency to 120 Hz 54 Set the 4268A s trigger mode to manual 55 Connect the 1 uF Standard Capacitor to the 4268A shown in Figure 2 5 28 Chapter 2 Maintenance Performance Test 56 Press the Trig key to start the measurement 57 Record the 4268A readings of Cp and D on the calculation sheet 58 Calculate the test results according to the calculation sheet and record the results into the performance test record 59 Set the Frequency to 1 kHz and perform step 56 to 58 D z D 5 2 4 5 D 5 o 4 Chapter 2 29 Maintenance Function Test Function Test Introduction This section provides the test procedures used to verify the 4268A s performance characterist
45. certifies that this product met its published specifications at the time of shipment from the factory Agilent Technologies further certifies that its calibration measurements are traceable to the United States National Institute of Standards and Technology to the extent allowed by the Institution s calibration facility or to the calibration facilities of other International Standards Organization members Limitation Of Warranty The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance by Buyer Buyer supplied software or interfacing unauthorized modification or misuse operation outside the environmental specifications for the product or improper site preparation or maintenance No other warranty is expressed or implied Agilent Technologies specifically disclaims the implied warranties of merchantability and fitness for a particular purpose WARNING Assistance Product maintenance agreements and other customer assistance agreements are available for Agilent Technologies products For any assistance contact your nearest Agilent Technologies Sales and Service Office Addresses are provided at the back of this manual Exclusive Remedies The remedies provided herein are buyer s sole and exclusive remedies Agilent Technologies shall not be liable for any direct indirect special incidental or consequential damages whether based on contract tort or any other legal theory Safety S
46. cs ni A peka Re Gel aah Sees iter rta E 15 Measurement Parameter Settings 15 Frequency ALEA 16 Signal EGA baL 16 Cable Length Settings a Bao ae eee gee ie 16 Measurement Time Mode Setting 16 Trigger Mode Setting 2422244 erari Seine wea ern a Obed Heed eee eed eer te 17 ATC Setting sess SE E aire ecg AT ENEN GEN GE GK EEREN EEK EEE eo ies den ZE eo 17 Performance Test eddie na en 18 Introduction iii rd is A eter 18 Frequ ncy Accuracy Test arruan A gg a R R R N 19 Signal NEGA aa dea A A SA 21 Measurement Accuracy Tetu a o HALE ee R gek gu 23 Function Test do A A A DA A ete tr 30 Intro A ea Lie 30 Signal Level Monitor Testi a A E TEOK EEEk EAT EEA ee 31 ALC Function ESE Auger rg gt bea eed Hae dp ar gara Oa area eden ier eo 33 Contact Check Test acoso orena Mas diato dut etat A SEA ardietara 35 Handler Interface Test ee ey eed eh noue R WORE Rk Led ence E are gine KR tune 37 Scanner Interface Test opt 001 only 41 Calculation Sheet R ER as gr RN dur dr Epe ae ar E argie garea 44 Performance ESE Aziz didi niet eh ead egiek eite geizki eun is heal tete 44 Function Test siey g RR ra rez rege gr dag ee d Ope e beet gr OER RSA ue 50 egiek AA EA ZEATE Ea EK EEA INE AE aad doe EEE EE Ga A ee Eo 51 Performance Test Record ads tac n 51 Function GSK EGO untar yl Gete do dee a dattes
47. ds BNC connector from the Lpot terminal of the standard resistor 11 Confirm that the 4268A displays N C No Contact 12 If contact check function work correctly check pass into the function test record 36 Chapter 2 NOTE Figure 2 9 A1 Main board 4268E0701 Handler Interface Test Maintenance Function Test The 4268A s handler interface function is tested using the built in self test and the handler interface simulator Test Equipment Procedure Initial Setup Description Recommended Model Handler Interface Simulator p n 04278 65001 1 Turn the 4268A off 2 Remove the 4268A outer cover 3 Confirm jumpers P17 P18 and P19 a switch S2 and resistors J12 and J13 D BK 5 2 4 5 D 5 o 4 on the 4268A Al main board are the factory setting as shown in Figure 2 9 If they has been changed by customer set them to the factory setting Memorize the setting of the jumpers the switch and the resistors to reset them after this test if necessary 4268A A1 Main Board EXT Trigger Connector Handler I F connector 2 P17 8 P17 7 P17 6 reserved reserved EXT 12 5 DCV1 70100 DIO OO OG SOO DIO O OOQ 200000000000 00000000000 sa dn bee E ZE OE ZE DE DE DE ZE DE DE TE
48. e assembly program certain factory repaired and tested assemblies are available on a trade in basis These assemblies are offered al lower cost than a new assembly but meet all factory specifications required of a new assembly 92 Chapter 5 Assembly Replacement Replaceable Parts List The defective assembly must be returned for credit under the terms of the rebuilt exchange assembly program Any spare assembly stock desired should be ordered using the new assembly part number A Quiassy C pu D O O 3 Chapter 5 93 Assembly Replacement Replaceable Parts List Parts List Figure 5 1 Top View Major Assembly BEI 0000000000 oj LO Lol Le 4268ase07001 Table 5 1 Top View Major Assembly Reference Agilent Part Check Qty Description Designation Number Digit 1 04268 66502 1 1 A2 CPU Board Assembly 04339 24006 8 4 Standoff 0515 1550 0 4 Screw M3 2 04268 04001 5 1 Shield 04268 01202 2 1 Bottom Cover 0950 3408 3 1 Power Supply 50 W 1400 1048 9 1 Saddle Edge 0515 1550 0 8 Screw M3 3 04268 66501 0 1 A1 Analog Board As
49. eck for a beep sound for a moment and if you see anything is displayed on the LCD 3 If LCD doesn t light power supply suppose to be failure Proceed to Power Supply Troubleshooting 4 If error message is displayed on the LCD power supply seems fine Proceed to Digital Circuit Troubleshooting Chapter 4 69 gt Q T D ao o y G e on a Troubleshooting Trouble Isolation 5 Ifno error message is displayed on the LCD power supply and digital control circuit seem fine Proceed to Analog Circuit Troubleshooting Power Supply Troubleshooting Figure 4 2 Flowchart Power Supply Trouble Isolation Fan and LED Check LCD Backlight Check Check2 Fan and LED Check 1 Turn the 4268A off Remove the cover from the 4268A Turn the 4268A on Check if the cooling fan is rotating E AN 2 If fan is rotating check 12 V LED on Al board and 5V LED on A2 board 70 Chapter 4 See Figure 4 3 for the location of the LEDs Troubleshooting Trouble Isolation 6 If fan isn t rotating or LEDs don t light proceed to Check3 5 V and 12 V Check Figure 4 3 LEDs location du EES 0000000000 EO
50. ective A1 board Figure 5 12 Al Main Board Removal 5 0000020000 KIT EI KA o o o o 4268ase07012 108 Chapter 5 NOTE Assembly Replacement Disassembly Procedure A2 CPU Board Replacement Tools Required e Pozidriv screwdriver pt size 1 small PLCC extractor Removal Procedure 1 Remove the cover refer to Cover Removal 2 Disconnect the cable assemblies item 2 and 2 in Figure 5 13 3 Remove the four screws item 3 which fasten the A2 board to the standoffs Don t remove other screws on the A2 board 4 Remove the A2 board from the chassis Replacement Procedure 5 Remove the EEPROM item 5 from the A2 board using PLCC extractor Mount the EEPROM on the replacement A2 CPU board 6 Attach the Replacement A2 board with the screws removed in Removal Procedure 7 Connect all cables disconnected in Removal Procedure to the A2 board 8 Replace the bottom cover Chapter 5 109 pu D O O 3 ei A Quiassy TO Assembly Replacement Disassembly Procedure Figure 5 13 A2 CPU Board Replacement
51. ent Procedure Reference This section provides supplemental information for the adjustments which are performed by the program Connection instructions and some additional explanations are provided Use this chapter as a reference when performing the adjustments Signal Level Adjustment This adjustment updates the signal level adjustment data stored in the EEPROM The data adjust the actual signal source level to the set value Equipment Description Recommended Model Multimeter 3458A 61 cm BNC m BNC m Cable p n 8120 1839 Dual Banana BNC f Adapter p n 1251 2277 Setup Perform the following steps as the program instructs 1 Connect the Dual Banana BNC f Adapter to the BNC m BNC m Cable 2 Connect the Dual Banana BNC f Adapter to the 3458A s INPUT binding posts 3 Connect another end of the BNC m BNC m Cable to the 4268A s Hun Connector Chapter 3 61 gt 2 c a GO 3 4 5 Adjustment Adjustment Procedure Reference Figure 3 2 Signal Level Adjustment Setup Dual Banana to Multimeter S Adapter HP 4268A L GGO D DOD DD GOGOE E EO E GGO G DOG G D D 61cm BNC m BNC m Cable 4268ASE02001 62 Chapter 3 Figure 3 3 Adjustment Adjustment Procedure Reference Signal Level Monitor Adjustment This adjustment updates the signal level monitor adjustment data stored in the EEPROM The data
52. ep 2 Step 3 Maintenance How to set the 4268A for the Maintenance How to set the 4268A for the Maintenance This section shows the 4268A measurement condition setting procedures which are used in the performance test and the function test Resetting the 4268A Press the Reset key blue key key The menu below appears 19 Shift S Cp 22 567 uF D 0 0345 FREQ 1kHz S System Reset No Yes LVL 1000mV OO bel Measurement Settings Short Med Long Int Man Ext ALG Syne Hold Load Gomprtr Cont Rmt Key Meas Time _ Trigger On Source Range On On Chk Lock 42680303 Press the P gt key to blink Yes and then press the Enter key Measurement Parameter Settings Press the Meas Prmtr key The primary parameter selection menu below appears Shift Cp 22 567 u F D 0 0345 FREQ 1kHz Pri Prmtr Cp Cs LVL 1000mV Short Med Long Int Man Ext ALG Syne Hold Load Gomprtr Cont Rmt Key Measurement Settings a Meas Tim d i a On ce Range On On Chk Lock 42680308 The blinking parameter is the current setting of the primary parameter To change the setting use the Ta key to blink the parameter you want to set and then press the Enter key The secondary parameter selection menu below appears In the same way as the primary parameter use the Ta key to blink the parameter you want to set and then press the Enter key The secondary parameters displayed in the
53. eric keys and other necessary keys enter a desired level and press the Enter key For example press 5 0 0 Eng and Enter keys to set the signal level to 500 mV Cable Length Setting Press the Cable key blue key 3 key The menu below appears Shift Cp 22 567 uF D 0 0345 FREQ 1kHz Cable Length Om im 2m LVL 1000mV ae Short Med Long Int Man Ext ALG Sync Hold Load Gomprtr Cont Rmt Key Measurement Settings Meas Time Trigger On Source Range On On Chk Lock 42680307 The blinking value is the current setting of the cable length To change the setting use the 1 gt key or lt y key to blink the cable length you want to use and then press the Enter key Measurement Time Mode Setting Press the Meas Time key The Wsymbol above either Short Med or Long indicates the current measurement time setting The following figure is an example when Med is selected 16 Chapter 2 Maintenance How to set the 4268A for the Maintenance Shift Cp 22 567 u F D 0 0 345 FREQ 1kHz v v v LVL 1000mV 42680401 BOT d Trigger Mode Setting Press the Trig Mode key The Wsymbol above either Int Man Ext indicates the current trigger mode setting The figure above is an example when internal trigger mode is selected D BK 5 2 4 5 D 5 o 4 ALC Setting Press the ALC key Each press toggles ON OFF If the Wsymbol above ALC On is displayed the
54. esult Uncertainty 120 Hz 500 mV Rs 0 0097 Q Q 0 0001 Q 1 kHz 500 mV Rs 0 0057 Q Q 0 0001 Q Measurement Accuracy Test 1 m 1 pF Meas Time MED ALC OFF Signal Parameter EO Measurement Frequency Level Measured Test Limits Test Result acetate 120 Hz 1000 mV Cp 0 0020 pF uF 0 00021 pF 120 Hz 1000 mV D 0 0020 0 00015 1 kHz 1000 mV Cp 0 0018 pF pF 0 00021 pF 1 kHz 1000 mV D 0 0018 0 00010 Measurement Accuracy Test 1 m 10 pF Meas Time MED ALC OFF Signal Parameter ale Measurement Frequency Level Measured Test Limits Test Result OE EEE 120 Hz 1000 mV Cp 0 0197 pF pF 0 0021 pF 120 Hz 1000 mV D 0 00197 0 00004 1 kHz 1000 mV Cp 0 018 pF pF 0 0021 pF 1 kHz 1000 mV D 0 0018 0 00004 Measurement Accuracy Test 2 m 1 pF Meas Time MED ALC OFF Signal Parameter Ae Measurement Frequency Level Measured Test Limits Test Result ZEZ 120 Hz 1000 mV Cp 0 0020 pF uF 0 00021 pF 120 Hz 1000 mV D 0 0020 0 00015 1 kHz 1000 mV Cp 0 0018 pF pF 0 00021 pF 1 kHz 1000 mV D 0 0018 0 00010 Copyright 2009 Agilent Technologies Agilent 4268A 120Hz 1kHz Capacitance Meter Service Manual Fourth Edition E Agilent Technologies Agilent Part No 04268 90110 May 2003 Printed in Japan NOTE Notices The information contained in this document is subject to change without notice This document contains proprietary information that is protected by copyright All rights are reserved No part
55. flowing thorough it The 4268A essentially consists of a signal source a vector voltmeter and a vector current meter Measurement Principal ex DUT o Zx v A y Zsa y In Figure 4 6 a DUT connected in series with a test voltage source including an output resistance voltmeter V and ammeter A If the ammeter measures ix ampere when the source voltage is x the DUT s impedance Zx is expressed by Zx ex ix Analog Circuit The analog circuit of the 4268A consists of signal source section transducer section and detector section The signal source section applies a measurement signal to the DUT The transducer block converts the voltage across and the current through the DUT to two voltages which are output to the vector ratio 84 Chapter 4 Figure 4 7 4268ASE05011 Troubleshooting Theory of Operation detector The voltage across the DUT is input to differential amplifier V The current through the DUT is converted to a voltage before being input to differential amplifier 7 The vector ratio detector switches these two voltages to be converted to digital data The CPU calculates DUT impedance from the vector ratio of these two voltages and displays the result on the LCD Analog Circuit Block Diagram Signal Source Transducer gt CPU Resistor The signal source
56. for the adjustments Using the program the computer controls the 4268A and the other pieces of equipment to obtain the adjustment data and stores the data in the 4268A internal EEPROM The adjustment program runs on the computer listed in Required Controller The program should be installed into your computer according to the procedure described in Program Installation To start the program after 1t has been installed refer to Program Execution Figure 3 1 shows the adjustment program flow The following lists the brief explanation for each menu item At the end of each adjustment data both to the 4268A internal EEPROM 58 Chapter 3 Adjustment Adjustment Program Figure 3 1 Adjustment Program Flow 1 PROGRAM START 2 Equipment Address and File Directory Setup 3 R Standard Calibration Value Input step 5 Adjustment 7 PROGRAM Selection FINISH 6 Do Adjustment gt 2 c 0 a 3 oO 5 4268ASE03003 Table 3 1 Title of the adjustment in the program Title in the Description adjustment program Firmware FW_INSTALL updates the 4268A firmware Installation Signal Level Adj SigLevel obtains the data to adjust the actual signal Adjustment source output voltage to the set value Signal Level Adj LvlMonitor obtains the data to adjust the signal level Monitor monitor to the signal source output voltage Adjustment Impedance Adj OPEN Om obtains the data to adjust the actual Me
57. formance Test Adjustment Firmware Installation A2 EEPROM All Adjustments All Performance Tests Signal Level Monitor Function Test Power Supply None Power on Self test All Performance Tests Fan Assembly None Power On Self test BNC Connector None Power On Self test All Performance Tests LCD Assembly None Power On Self test Keyboard Assembly None Power On Self test Front Keyboard Test a See Power On Self test on page 79 b If the EEPROM is NOT transferred to the new board all adjustments and perfor mance tests are required c See Front Panel Key Test on page 80 114 Chapter 5 NOTE Assembly Replacement Firmware Installation Firmware Installation Firmware may not be in new A2 CPU board When you replace a faulty A2 CPU with a new one Required Controller Computer PC AT compatible RAM 64Mbytes CPU Pentium200MHz OS Microsoft Windows NTO 24 0 Windows 958 Application Agilent VEE 24 0 GPIB Card 82350 82340 82341 Installation Program and Firmware File The installation program is required to install the firmware The stand alone firmware installation program or the adjustment program has capability of the installation The firmware file of proper revision to be installed is also required Firmware installation Procedure Perform following steps to install the firmware into the 4268A 1 Turn the 4268A off Then while pressing the 5 key turn the 4268A on 2
58. gure shows an example when the Trig key is pressed If the name of the key is not displayed correctly the key does not function Contact your nearest Agilent Technologies sales office or the company from which you purchased this instrument Shift press any KEY or ENTER twice to exit be KEY TEST 5 Trigger Short Med Long Int Man Ext ALG Sync Hold Load Gomprtr Gont Rmt Key Measurement Settings y leas Ti d Trigger On Source Range On On Chk Lock 42680412 Ifyou want to finish the test press the Enter key twice The service function menu appears Check that Exit is blinking if not operate keys to blink Exit press the Enter key to return to the immediately previous menu and then exit from this menu in the same way Handler Interface Test Verify the Handler Interface Function using the handler interface simulator For detail refer to Handler Interface functional test in Handler Interface Test on page 37 Scanner Interface Test Opt 001 only Verify the Scanner Interface Function using the scanner interface simulator For detail refer to Scanner Interface functional test in Scanner Interface Test opt 001 only on page 41 80 Chapter 4 Step 1 Step 2 Step 3 Step 1 Step 2 Step 3 Troubleshooting Service Function ROM Test Verifies that the checksum of the Boot ROM and the Flash ROM are correct Press the Config key blue key key Use the T a key
59. he operator unique data such as the operator saved measurement setup condition The EEPROM will not lose its data when power is turned off The EEPROM is mounted in a socket for easy replacement Digital Circuit A2 CPU Board Assy YOSSID0Yd a N BIT SWITCH ZLALLN 8en Zen PLA ELN Keyboard A1 Assy Main Board Assy Handler 88 Chapter 4 Troubleshooting Theory of Operation Power Supply Circuit The ac line power is connected to the AC Inlet on the rear panel that includes the fuse And the ac line power is supplied to power supply assembly The power supply assembly outputs de voltages of 12 V 5 V and 12V The de voltages are supplied to all assemblies either directly or indirectly via the Al assembly gt y Q T D GO o y G e on O Chapter 4 89 Troubleshooting Theory of Operation 90 Chapter 4 Assembly Replacement This chapter contains the 4268A s replaceable parts list and the procedure to replace its assemblies A Quiassy TO pu D O O 3 D 91 WARNING Assembly Replacement Safety Safety Read the safety summary at the front of thi
60. ics and functions The function test is recommended to be performed with the 4268A performance test Warm Up Time Allow the 4268A to warm up for at least 30 minutes before you execute any of the function tests Ambient Conditions Perform all performance tests in ambient conditions of 23 C 5 C lt 70 RH 30 Chapter 2 Maintenance Function Test Signal Level Monitor Test The 4268A s signal level monitor is measured with an AC voltmeter Performance Characteristic Signal Level Monitor Accuracy 2 2 mV Test Equipment GA z Description Recommended Model 2 AC Voltmeter 3458A E d Interface Box p n 04284 65007 61 cm BNC m BNC m Cable p n 8120 1839 Dual Banana BNC f Adapter p n 1251 2277 Procedure 1 Reset the 4268A 2 Set up the equipment as shown in Figure 2 6 Figure 2 6 Signal Level Monitor Test Setup Dual Banana to Multimeter BNC f Adapter HP 4268A Interface Box TEST SIGNAL 61cm BNC m BNC m Cable 4268ASE02008 3 Set the 3458A Multimeter to the Synchronously Sub sample AC voltage measurement mode using the following procedure a Press the ACV key to set the measurement mode to AC voltage Chapter 2 31 Maintenance Function Test 7 8 9 b Press the S key blue key N Rdgs Trig key Y 4 4 to display SETACV c Press g
61. ikely to expose dangerous voltages Disconnect the instrument from all voltage sources while it is being opened SUSCEPTIBLE TO DAMAGE FROM ESD Perform the following procedures only at a static safety workstation and a grounding strap Cover Removal Tools Required e Pozidriv screwdriver pt size 1 small Procedure 1 Remove the two screws which fasten the cover to the chassis rear panel 2 Slide the cover toward the rear while holding the front panel bezel A1 Main Board Removal Tools Required e Pozidriv screwdriver pt size 1 small e Flat blade screwdriver Procedure 1 Remove the A2 CPU Board Assembly refer to A2 CPU Board Assembly Removal 2 Disconnect the following assemblies items 2 from the Al Board 3 Remove the four cable assemblies item 3 connected to the UNKNOWN Terminals 4 Remove the nut which fasten the Ext Trigger item 4 connector to the rear panel 5 Remove the four standoffs item 5 that fasten the Al assembly to the chassis by rotating them with a flat based screwdriver A Quiassy TO pu D O O 3 ei Chapter 5 107 Assembly Replacement Disassembly Procedure 6 Remove the eight screws item 6 and 64 in Figure 5 12 NOTE Don t remove any screws which fasten the transistors on Al assembly 7 Lift the front side of the Al assembly and slide it toward the front side NOTE When replacing to the re built A2 board return the def
62. k diagram In the figure iour and Vour are the outputs of the transducer section The amplifier amplifies the ac signal Its gain depends on the signal source voltage and measurement range Low pass filter LPF filters the signal so that noises of higher frequency than the measurement signal frequency is cut The filter cutoff frequency depends on the measurement signal frequency Figure 4 10 Detector Block Diagram gt y Q T D GO o y G e on O 4268ASE05027 Chapter 4 87 Figure 4 11 Troubleshooting Theory of Operation Digital Circuit The digital circuit consists of the A2 CPU board assembly and peripheral assemblies such as the keyboard and LCD The circuit communicates with the Al main board assembly in order to control the latches switches and other components on the Al assembly and receive the measurement data The GPIB interface on the A2 assembly allows the 4268A communicate with a controller A handler interface on the Al assembly allows the 4268A communicate with an external handler The A2 CPU board assembly includes a processor Boot ROM Flash ROM EEPROM and LEDs The Boot ROM stores the booting program The Flash ROM stores the firmware which controls the 4268A s operation and functions The firmware can be updated using a updating program written using the HTBasic The EEPROM stores the unit unique data such as the adjustment data and t
63. m Way fax 852 2506 9284 Mississauga Ontario L4W 5G1 tel 1 877 894 4414 Europe Agilent Technologies Test amp Measurement European Marketing Organization P O Box 999 1180 AZ Amstelveen The Netherlands tel 31 20 547 9999 Japan Agilent Technologies Japan Ltd Call Center 9 1 Takakura Cho Hachioji Shi Tokyo 192 8510 Japan tel 81 426 56 7832 fax 81 426 56 7840 Latin America Agilent Technologies Latin American Region Headquarters 5200 Blue Lagoon Drive Suite 950 Miami Florida 33126 U S A tel 305 267 4245 fax 305 267 4286 Australia New Zealand Agilent Technologies Australia Pty Ltd 347 Burwood Highway Forest Hill Victoria 3131 tel 1 800 629 485 Australia
64. moval Tools Required e Pozidriv screwdriver pt size 1 small Procedure 1 Remove the cover refer to Cover Removal 2 Remove the wire assembly and the flat cable assemblies connected to the A2 assembly 3 Remove the two flat head screws which fasten the front panel from the bottom 4 Remove the side trim label from both sides of the front bezel 5 Remove the four screws which fasten the front frame to the chassis from both sides LCD Assembly Removal Tools Required e Pozidriv screwdriver pt size 1 small Procedure 1 Remove the front Assembly refer to Front Assembly Removal 2 Place the front assembly face down 3 Remove the two screws which fasten the LCD to the front panel bezel 4 Remove the LCD assembly from the front panel bezel 112 Chapter 5 Assembly Replacement Disassembly Procedure Keyboard Assembly Removal Tools Required e Pozidriv screwdriver pt size 1 small Procedure 1 Remove the front Assembly refer to Front Assembly Removal 2 Place the front assembly face down 3 Remove the screw which fasten the keyboard to the front bezel 4 Slide the keyboard assembly toward left and remove it BNC Connector Removal Tools Required e Pozidriv screwdriver pt size 1 small e Open end wrench 9 16 inch Procedure 1 Remove the front assembly refer to Front Assembly Removal Place the front panel assembly so that the front panel face down Disc
65. ng steps as the program instructs 1 Connect the specified equipment as instructed Refer to the Figure 3 4 and Figure 3 5 2 Repeat step 1 as instructed Impedance Measurement Adjustment Setup without Test Leads HP 4268A j o OO O GO GOGOE GO ooogo HP 42090A HP 42091A OPEN SHORT FP 42030A Termination Termination Standard Resistors 64 Chapter 3 Adjustment Adjustment Procedure Reference Figure 3 5 Impedance Measurement Adjustment Setup with Test Leads HP 4268A DO Goad oojao000 oooogg 000 2606 ocobobono 1m Test Leads HP 16048A or HP 16048D 2m Test Leads BNC f BNC f Adapter 4 HP 42090A HP 42091A OPEN SHORT Termination Termination 4268A SE03002 gt 2 a GO 3 4 5 Chapter 3 65 Adjustment Adjustment Procedure Reference 66 Chapter 3 S OO GC E OO GO GQ e 5 Q Troubleshooting This chapter provides assembly level troubleshooting information for the 4268A The information includes trouble isolation service function and theory of operation 67 WARNING Troubleshooting Introduction Introduction Safety Read the safety summary at the front of this manual before servicing the
66. o the function test record 34 Chapter 2 Maintenance Function Test Contact Check Test The 4268A s contact check function is tested by breaking contact at the Lpot terminal When the 4268A measures impedance correctly the contact check function for the other three terminals will operate correctly Test Equipment Description Recommended Model D Standard Resistor Set 42030A o OPEN Termination 42090A S Test Leads 1 m 16048A OO Adapter BNC f BNC f p n 1250 0080 4 ea Procedure 1 Reset the 4268A 2 Set the cable length to 1 m 3 Connect the OPEN termination to the 4268A s UNKNOWN terminals using the 1 m test leads and four BNC f BNC f adapters Figure 2 8 Contact Check Test Setup HP 4268A E ecboca DO oo 19 p doo OO 0000 ooobodDiuono t HP 16048A 1m Test Leads BNC f BNC f Adapter DD D D anno HP 42090A HP 42038A OPEN 10 kQStandard Termination Resistor 4268ase02007 4 Press blue 4 to display the OPEN correction menu 5 Select OpenMeas and press Enter The OPEN correction is performed 6 Connect the 10 kQ standard resistor instead of the OPEN termination Chapter 2 35 Maintenance Function Test 7 Press Auto Hold to hold the measurement range 8 Press blue 2 to activate the contact check function 9 Confirm that the 4268A displays the measurement values 10 Remove the test lea
67. of this document may be photocopied reproduced or translated to another language without the prior written consent of the Agilent Technologies Agilent Technologies Japan Ltd Component Test PGU Kobe 1 3 2 Murotani Nishi Ku Kobe shi Hyogo 651 2241 Japan Copyright 1999 2000 2003 Agilent Technologies Japan Ltd Manual Printing History The manual s printing date and part number indicate its current edition The printing date changes when a new edition is printed Minor corrections and updates that are incorporated at reprint do not cause the date to change The manual part number changes when extensive technical changes are incorporated April 1999 First Edition November 1999 Second Edition June 2000 Third Edition May 2003 Fourth Edition Safety Summary The following general safety precautions must be observed during all phases of operation service and repair of this instrument Failure to comply with these precautions or with specific WARNINGS elsewhere in this manual may impair the protection provided by the equipment In addition it violates safety standards of design manufacture and intended use of the instrument The Agilent Technologies assumes no liability for the customer s failure to comply with these requirements 4268A comply with INSTALLATION CATEGORY II and POLLUTION DEGREE 2 in IEC1010 1 4268A are INDOOR USE product NOTE WARNING LEDs in 4268A are Class 1 in accordance with IEC825 1 CLASS
68. onnect the cable assembly which is connected to the BNC connector Remove the core clamp supporting the cable disconnected in step 3 E d amp db Remove the nut which fasten the BNC connector to the sub panel EEPROM or Boot ROM Replacement Required Tool e Pozidriv screwdriver pt size 1 small PLCC Extractor Replacement Procedure 1 Remove the A2 CPU Board Assembly refer to A2 CPU Board Assembly Removal 2 Remove the EEPROM or the Boot ROM from the A2 CPU board using the PLCC Extractor A Quiassy TO pu D O O 3 Chapter 5 113 Assembly Replacement Post Replacement Procedure Post Replacement Procedure Table 5 12 lists the required procedures that must be performed after the replacement of an assembly or the EEPROM These are the recommended minimum procedures to ensure that the replacement is successfully completed When you replace an assembly or the EEPROM on the A2 CPU perform the adjustments and updating correction constant then verify the 4268A performance according to Table 5 12 For the detail of the adjustments and updating correction constants see Chapter 3 Adjustment Table 5 12 Post Replacement Procedure Replaced Required Adjustment Required Verification Assembly or Part Al Main Board All Adjustments Power On Self test All Performance Tests All Function Tests A2 CPU Board Firmware installation Power On Self test Per
69. rom A2 board Measure voltage of the socket using a multimeter 2 3 4 If the voltage is not 5 V 0 5V replace A2 board 5 If the voltage is 5 V 0 5V replace LCD 72 Chapter 4 Troubleshooting Trouble Isolation Digital Circuit Troubleshooting Figure 4 4 Flowchart Digital Trouble Isolation rror number is 11 12 13 of 142 Replace A2 Error number is 15 or 16 Replace A1 Replace Fan Assembly Error number is 17 Turn HP 4268A power off Return overall troubleshooting gt y GQ G eN D on Ea le OO 5 GO Check6 Error Number Confirmation 1 If error number is 11 12 13 or 14 replace A2 assembly 2 If error number is 15 or 16 replace Al assembly 3 If error number is 17 replace fan assembly 4 Turn the 4268A off Chapter 4 73 Troubleshooting Trouble Isolation 5 Go to Overall Troubleshooting on page 69 74 Chapter 4 Troubleshooting Trouble Isolation Analog Circuit Troubleshooting Figure 4 5 Flowchart Analog Trouble Isolation Source Level Level Monitor Impedance EEPROM correction OFF at Fail Point Do Adjustment Cable is failure Cable is o k Replace the cable Replace A1 Check7 Test at failed point 4268ASE05022 1 Set the 4268A adjustment data setting Off to cancel the digital adjustment See Adjustment Data Setting on page 83 Chapter 4 75 gt le G eN D on Ea G OO 5
70. s manual before servicing the instrument The servicing procedures described herein are performed when power is supplied to the instrument and its protective covers are removed This type of servicing must be performed only by service trained personnel who are aware of the hazards involved for example fire and electrical shock When serving can be performed without power applied to the instrument remove power from the instrument Before any repair is completed ensure that all safety features are intact and functioning and that all necessary parts are properly connected to the protective grounding system ESD Precautions When using any of the procedures in this chapter you should use proper ESD precautions As a minimum you should place the instrument on a properly grounded ESD mat and wear a properly grounded ESD wrist strap Replaceable Parts List Ordering Information To order part listed in the replaceable part lists quote the Agilent Technologies part number with a check digit indicate the quantity required and address the order to the nearest Agilent Technologies office The check digit will ensure accurate and timely processing of the order To order a part not listed in the replaceable part table include the instrument model number the description and function of the part and the quantity of parts required Address the order to the nearest Agilent Technologies office Exchange Assemblies Under the rebuilt exchang
71. sembly 04268 69501 A1 Analog Board Assembly Exchange 0515 1550 0 8 Screw M3 94 Chapter 5 Assembly Replacement Replaceable Parts List Figure 5 2 Top View Cable Oo LO OO 4268ase07002 A Quiassy TO pu D O O 3 ei Chapter 5 95 Assembly Replacement Replaceable Parts List Table 5 2 Top View Cable Reference Agilent Part Check Qty Description Designation Number Digit 1 04268 61632 8 1 Wire Assembly 2 Part of Al Board Flat Cable 3 04194 61697 6 1 Flat Cable Assembly 4 See Table 5 9 Cable Assembly Opt 001 5 04268 61633 9 1 Wire Assembly for ground 6 1400 1391 5 1 Cable Clamp T 1400 1334 6 1 Cable Clamp 8 04268 61601 1 1 RF Cable Assembly A 9 04268 61602 2 1 RF Cable Assembly B 10 04268 61603 3 1 RF Cable Assembly C 11 04268 61604 4 1 RF Cable Assembly D 12 04339 25004 8 4 Core Clamp 0515 1551 1 4 Screw M3 96 Chapter 5 Assembly Replacement Replaceable Parts List Figure 5 3 Top View Mechanical Parts
72. t Figure 2 3 Measurement Accuracy Test 0m Setup HP 4268A 0000000000 ooocolcaco t HP 42090A HP 42091A OPEN SHORT Deen Termination Termination a HP 16380A C Standard Capacitors 4268ASE02002 4 Press the Open key blue key 4 key to display the OPEN correction menu 5 Select OpenMeas using 4 4 or P gt key and press Enter The OPEN correction is performed 6 Connect the SHORT termination to the 4268A s UNKNOWN terminals 7 Press the Short key blue key 5 key to display the SHORT correction menu 8 Select ShortMeas using 4 or T a key and press Enter The SHORT correction is performed 9 Set the 4268A trigger mode to manual 10 Connect the 1000 pF Standard Capacitor to the 4268A s UNKNOWN terminals 11 Press the Trig key to start the measurement 12 Record the 4268A readings of Cp and D on the calculation sheet 13 Calculate the test results according to the calculation sheet and record the results into the performance test record 24 Chapter 2 Maintenance Performance Test 14 Perform this test for all standards and frequency settings listed in Table 2 2 Table 2 2 Measurement Accuracy Test 0m Capacitance se
73. t J d 4 to display SYNC then press Enter Set the 4268A s trigger mode to manual Set the 4268A s frequency to 120 Hz Activate the 4268A s voltage monitor with the following procedure a Press the Level Mon key blue key ShowSetting key b Select Vmon using y or P gt and press the Enter key Record the Multimeter reading on the calculation sheet Press Trig key to start the measurement Record the 4268A reading of voltage monitor on the calculation sheet 10 Calculate the output resistance according to the calculation sheet 11 Perform step 7 and 8 for all settings listed in Table 2 5 Table 2 5 Signal Level Monitor Test Settings Signal Frequency Means Time Signal Level 120 Hz MED 1000 mV 120 Hz SHORT 1000 mV 500 mV 300 mV 100 mV 1 kHz SHORT 1000 mV 500 mV 300 mV 100 mV 12 If all test results are in the test limits check pass into the function test record 32 Chapter 2 Maintenance Function Test ALC Function Test The 4268A s output impedance is measured when ALC function works Performance Characteristic Output Resistance lt 0 1Q Test Equipment Description Recommended Model Standard Resistor Set 42030A OPEN Termination 42090A D z D 5 SO 4 5 D 5 o oO Procedure NY A NN A N 9 Reset the 4268A Set the 4268A s signal level to 500 mV Set the 4268A s frequency to 120 Hz Set the 4268
74. ta and for calculating the performance test results The procedure for using the calculation sheet and performance test record is 1 Photo copy the calculation sheet 2 Follow the performance test procedure and record the measurement values the 4268A s reading etc into the specified column on the calculation sheet 3 Calculate the test result using the appropriate equation given on the calculation sheet and record the test result into the Test Result column of the performance test record 18 Chapter 2 Maintenance Performance Test Frequency Accuracy Test The 4268A s frequency is measured with a frequency counter Specification Frequency Accuracy 0 05 at 1 kHz 1 at 120 Hz Test Equipment N S Description Recommended Model E Frequency Counter 3458A 4 61 cm BNC m BNC m Cable p n 8120 1839 Dual Banana BNC f Adapter p n 1251 2277 Procedure 1 Reset the 4268A 2 Set up the equipment as shown in Figure 2 1 Figure 2 1 Frequency Accuracy Test Setup Dual Banana to Multimeter BNC f Adapter HP 4268A D OGO GGG 61cm BNC m BNC m Cable 4268ASE02001 Chapter 2 19 Maintenance Performance Test 3 Set the 3458A Multimeter to the frequency measurement mode pressing the FREQ key on the front panel of the 3458A 4 Select the 4268A s frequency to 120 Hz 5 Record the m
75. to blink Svc and then press the Enter key The service function menu below appears Shift Cp 22 567 uF D 0 0345 FREQ 1kHz KEY HNDL SCNR ROM RAM Exit LVL 1000mV do A Go TT Short Med Long Int Man Ext ALG Syne Hold Load Gomprtr Cont Rmt Key Measurement Settings a Meas Tim d 4 On urce Range On On Chk Lock 42680411 Use the Ta key to blink ROM and then press the Enter key The front panel key test screen appears Pass or Fail is displayed next to BOOT TEST and FLASH TEST in the upper line of the display The following figure shows an example when this test is completed RAM Test Verifies that the RAM data bus is connected correctly and there is no faulty memory cell Press the Config key blue key key Use the T a key to blink Svc and then press the Enter key The service function menu below appears Shift Cp 22 567 uF D 0 0345 FREQ 1kHz KEY HNDL SCNR ROM RAM Exit LVL 1000mV AOS berea Measurement Settings rr Short Ned Long Int Man Ext ALG Sync Hold Load Comprtr Gont Rmt Key Meas Tim amp gt On urce Range On Tn chk Look 42680411 Use the Ta key to blink RAM and then press the Enter key The front panel key test screen appears Pass or Fail is displayed next to RAM TEST in the upper line of the display The following figure shows an example when this test is completed Chapter 4 81 gt Q T D GO o
76. ttings Standard Meas Time Signal Level Frequency 1000 pF MED 1000 mV 1kHz 0 01 uF MED 1000 mV 120 Hz 1 kHz D 0 1 uF MED 1000 mV 120 Hz 3 1 kHz Z 1 uF MED 1000 mV 120 Hz 3 1 kHz 500 mV 120 Hz 1 kHz 300 mV 120 Hz 1 kHz 100 mV 120 Hz 1 kHz LONG 1000 mV 120 Hz 1 kHz SHORT 1000 mV 120 Hz 1 kHz Measurement Accuracy Test 0m Capacitance Sync Source Function ON 15 Set the 4268A s measurement time mode to MED 16 Set the 4268A s frequently to 120 Hz 17 Activate the Synchronous source function using the following procedure a Press the Sync Source key blue key Level key b Check the instrument setting indicator at the bottom of the display the W symbol is displayed above Sync Source 18 Confirm that the 1 F Standard is connected to the 4268A s UNKNOWN terminals 19 Press the Trig key to start the measurement 20 Record the 4268A readings of Cp and D on the calculation sheet 21 Calculate the test results according to the calculation sheet and record the Chapter 2 25 Maintenance Performance Test results into the performance test record 22 Set the Frequency to 1 kHz and perform step 19 to 21 Measurement Accuracy Test 0m Resistance 23 Set the Synchronous source function to OFF using the following procedure a Press the Sync Source key blue key Level key b Check the instrument setting indicator at the bottom of the display NOTHING is displayed above Sync Source
77. ultimeter reading on the calculation sheet 6 Calculate the result according to the calculation sheet and record the result into the performance test record 7 Change the 4268A s frequency to kHz and perform Step 5 and 6 20 Chapter 2 Maintenance Performance Test Signal Level Accuracy Test The 4268A s signal level is measured with an AC voltmeter Specification Signal Level Accuracy 10 Test Equipment GO Description Recommended Model 2 E AC Voltmeter 3458A E 61 cm BNC m BNC m Cable p n 8120 1839 Dual Banana BNC f Adapter p n 1251 2277 Procedure 1 Reset the 4268A 2 Set up the equipment as shown in Figure 2 2 Figure 2 2 Signal Level Accuracy Test Setup Dual Banana to Multimeter BNC f Adapter HP 4268A J ojooo0a OJODOO 0000 0060000 o hal 61cm BNC m BNC m Cable 4268ASE02001 3 Set the 3458A Multimeter to the Synchronously Sub sample AC voltage measurement mode using the following procedure a Press the ACV key to set the measurement mode to AC voltage b Press the S key blue key N Rdgs Trig key Y Y 4 to display SETACV Chapter 2 21 Maintenance Performance Test LN Zi EE 8 Table 2 1 22 c Press gt de d de to display SYNC then press Enter Set the 4268A s signal level to 1000 mV Set the test 4268A s signal frequency to 120 Hz Record the M
78. ultimeter reading on the calculation sheet Calculate the test result according to the calculation sheet and record the result into the performance test record Change the signal settings to perform this test for all settings listed in Table 2 1 Signal Level Accuracy Test Settings Frequency Signal Level 120 Hz 1000 mV 500 mV 100 mV 1 kHz 1000 mV 500 mV 100 mV Chapter 2 Measurement Accuracy Test Maintenance Performance Test The 4268A measures the calibrated standard capacitors and resistors at the 4268A s front panel and the measured values are compared with the standards listed calibration values Specification Basic Measurement Accuracy 0 2 See Chapter 10 on the 4268A Operation Manual for details D z D 5 2 4 5 D 5 o 4 Test Equipment Description Recommended Model Standard Capacitor Set 163804 Standard Capacitor Set 16380C Opt 001 Standard Resistor Set 42030A Test Leads 1m 16048A Test Leads 2m 16048D OPEN Termination 42090A SHORT Termination 42091A Adapter BNC f BNC f p n 1250 0080 4ea Procedure Measurement Accuracy Test 0m Capacitance Sync Source Function ON 1 Record the 16380A 16380C and 42030A calibration values on the calculation sheet 2 Reset the 4268A 3 Connect the OPEN termination to the 4268A s UNKNOWN terminal Chapter 2 23 Maintenance Performance Tes
79. using or key and press Enter The OPEN correction is performed 35 Connect the SHORT termination to the 4268 A UNKNOWN terminals 36 Press the Short key blue key 5 key to display the SHORT correction menu 37 Select ShortMeas using ek or P gt key and press Enter The SHORT correction is performed 38 Set the 4268A frequency to 120 Hz 39 Set the 4268A s trigger mode to manual 40 Connect the 1 uF Standard Capacitor to the 4268A as shown in Figure 2 4 41 Press Trig key to start the measurement 42 Record the 4268A readings of Cp and D on the calculation sheet 43 Calculate the test results according to the calculation sheet and record the results into the performance test record 44 Perform this test for all standards and frequency settings listed in Table 2 4 Table 2 4 Measurement Accuracy Test 1m Capacitance settings Standard Meas Time Signal Level Frequency 1 uF MED 1000 mV 120 Hz 1 kHz Chapter 2 27 Figure 2 5 4268ASE02004 Maintenance Performance Test Table 2 4 Measurement Accuracy Test 1m Capacitance settings Standard Meas Time Signal Level Frequency 10 uF MED 1000 mV 120 Hz 1 kHz Measurement Accuracy Test 2m 45 Reset the 4268A 46 Set the cable length to 2m 47 Connect the OPEN termination to the 4268A using the 2m test leads and four BNC f BNC f adapters as shown in Figure 2 5 Measurement A
80. ut this manual Instructions contained in the warnings must be followed Dangerous voltages capable of causing death are presenting this instrument Use extreme caution when handling testing and adjusting this instrument Warranty This Agilent Technologies instrument product is warranted against defects in material and workmanship for a period corresponding to the individual warranty periods of its component products Instruments are warranted for a period of one IMPORTANT year Fixtures and adapters are warranted for a period of 90 days During the warranty period Agilent Technologies will at its option either repair or replace products that prove to be defective For warranty service or repair this product must be returned to a service facility designated by Agilent Technologies Buyer shall prepay shipping charges to Agilent Technologies and Agilent Technologies shall pay shipping charges to return the product to Buyer However Buyer shall pay all shipping charges duties and taxes for products returned to Agilent Technologies from another country Agilent Technologies warrants that its software and firmware designated by Agilent Technologies for use with an instrument will execute its programming instruction when property installed on that instrument Agilent Technologies does not warrant that the operation of the instrument or software or firmware will be uninterrupted or error free Certification Agilent Technologies
81. ymbol General definitions of safety symbols used on the instrument or in manuals are listed below Instruction Manual symbol the product is marked with this symbol when it is necessary for the user to refer to the instrument manual Alternating current Direct current On Supply Off Supply In position of push button switch Out position of push button switch Frame or chassis terminal A connection to the frame chassis of the equipment which normally include all exposed metal structure This warning sign denotes a hazard It calls attention to a procedure practice condition or the like which if not correctly performed or adhered to could result in injury or death to personnel CAUTION This Caution sign denotes a hazard It calls attention to a procedure practice condition or the like which if not correctly performed or adhered to could result in damage to or destruction of part or all of the product NOTE Note denotes important information It calls attention to a procedure practice condition or the like which is essential to highlight Contents 1 General Information Instruments Covered by This Manual 10 Required Equipment ag dda te AG AAA A i On oe ee 11 2 Maintenance TestEquipment rtan o AL A a oe erra i be tie ee arara dar 14 How to set the 4268A for the Maintenance 15 Resetting 4268 A
82. z 1000 mV D 0 0020 0 00015 1k Hz 1000 mV Cp 0 0018 uF uF 0 00021 uF 1k Hz 1000 mV D 0 0018 0 00010 Chapter 2 55 D z D 5 2 4 5 D 5 o 4 Maintenance Test Record Function Test Record Signal Level Monitor Test Pass ALC Function Test Pass Contact Check Test Pass Handler Interface Test Pass Fail L Fail Fail Fail Scanner Interface Test Opt 001 only Pass L 56 Fail Chapter 2 gt 2 G 0 a 3 oO 5 Adjustment This chapter provides information on the adjustment required to ensure the 4268A is within its published specifications after it has been repaired or when it fails the performance tests The adjustments should be performed along with periodic maintenance to keep the 4268A in optimum operating condition If proper performance cannot be achieved after adjustments proceed to Chapter 4 57 Adjustment Required Controller Required Controller Performing adjustments requires the following controller Windows PC Personal Computer Computer PC AT compatible RAM 64Mbytes CPU Pentium200MHz OS Microsoft Windows NT 24 0 Windows 95 Software Agilent VEE 24 0 GPIB Card 82350 82340 82341 Required Equipment The required equipment is listed on Table 1 1 on page 11 Use only calibrated equipment when adjusting the 4268A Adjustment Program The adjustment program is required

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