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Keithley SourceMeter 3A 2420, Руководство по обслуживанию

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Calibration         2-11

2.

From normal display, press the SOURCE I key.

3.

Press the EDIT key to select the source display field, and then use the down RANGE key 
to select the 10

µ

A source range.

4.

From normal display, press MENU.

5.

Select CAL, and then press ENTER. The unit will display the following:

CALIBRATION

UNLOCK EXECUTE VIEW-DATES 

 SAVE LOCK CHANGE-PASSWORD

6.

Select EXECUTE, and then press ENTER. The instrument will display the following message:

I-CAL

Press ENTER to 10.000

µ

A

7.

Press ENTER. The Model 2420 will 10

µ

A and simultaneously display the fol-

lowing:

DMM RDG: +10.00000

µ

A

Use 

,

 

,

 

,

 

,

 ENTER, or EXIT.

8.

Note and record the DMM reading, and then adjust the Model 2420 display to agree 
exactly with the actual DMM reading. Use the up and down arrow keys to select the digit 
value, and use the left and right arrow keys to choose the digit position (or use the number 
keys, 0-9, +/-). Note that the display adjustment range is within ±10% of the present range.

9.

After adjusting the display to agree with the DMM reading, press ENTER. The instru-
ment will then display the following:

I-CAL

Press ENTER to 00.000

µ

A

10.

Press ENTER. The Model 2420 will source 0mA and at the same time display the following:

DMM RDG: +00.00000

µ

A

Use 

,

 

,

 

,

 

,

 ENTER

, or EXIT.

11.

Note and record the DMM reading, and then adjust the Model 2420 display to agree with 
the actual DMM reading. Note that the display value adjustment limits are within ±1% 
of the present range.

12.

After adjusting the display value to agree with the DMM reading, press ENTER. The 
unit will then display the following:

I-CAL

Press ENTER to Output -10.000

µ

A

13.

Press ENTER. The Model 2420 will source -10

µ

A and display the following:

DMM RDG: -10.00000

µ

A

Use 

,

 

,

 

,

 

, ENTER, or EXIT.

14.

Note and record the DMM reading, and then adjust the Model 2420 display to agree with 
the DMM reading. Again, the maximum display adjustment is within ± 10% of the 
present range.

15.

After adjusting the display value to agree with the DMM reading, press ENTER and note 
that the instrument displays:

I-CAL

Press ENTER to Output -00.000

µ

A

Содержание SourceMeter 3A 2420

Страница 1: ...c i a n sw i t ho v e r 1 5 0y e a r so f s p e c i a l i z a t i o n 9 0d a yw a r r a n t y 5d a yr i g h t o f r e t u r no na l l e q u i p me n t 1 3y e a r w a r r a n t i e sf o r n e wa n d p...

Страница 2: ...Model 24203A SourceMeter Service Manual A G R E A T E R M E A S U R E O F C O N F I D E N C E...

Страница 3: ...ECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OF ITS INSTRUMENTS AND SOFTWARE EVEN IF KEITHLEY INSTRUMENTS INC HAS BEEN ADVISED IN ADVANCE OF THE POSSIBILITY OF SUCH DAMAGES SUCH EX...

Страница 4: ...Model 2420 3A SourceMeter Service Manual 1997 Keithley Instruments Inc All rights reserved Cleveland Ohio U S A Fifth Printing October 2001 Document Number 2420 902 01 Rev E...

Страница 5: ...ated with the previous Revision of the manual are incorporated into the new Revision of the manual Each new Revision includes a revised copy of this print history page Revision A Document Number 2420...

Страница 6: ...n sient over voltages Installation Category II connections require protection for high transient over voltages often associated with localAC mains connections Assume all measurement control and data I...

Страница 7: ...manual explains dangers that might result in personal injury or death Always read the associated information very carefully before performing the indicated procedure The CAUTION heading in a manual ex...

Страница 8: ...ompliance considerations 1 7 Compliance limits 1 7 Type of compliance 1 7 Maximum compliance values 1 8 Determining compliance limit 1 8 Taking the SourceMeter out of compliance 1 8 Output voltage acc...

Страница 9: ...utine Maintenance Introduction 3 2 Line fuse replacement 3 2 4 Troubleshooting Introduction 4 2 Repair considerations 4 2 Power on self test 4 2 Front panel tests 4 3 KEYS test 4 3 DISPLAY PATTERNS te...

Страница 10: ...uction 6 2 Parts lists 6 2 Ordering information 6 2 Factory service 6 2 Component layouts 6 2 A Specifications Accuracy calculations A 10 Measurement accuracy A 10 Source accuracy A 10 B Command Refer...

Страница 11: ...er hardware requirements C 2 Software requirements C 2 Calibration equipment C 2 General program instructions C 2 Program C 1 Model 2420 calibration program C 4 Requesting calibration constants C 7 Pr...

Страница 12: ...for resistance accuracy verification 1 15 2 Calibration Voltage calibration test connections 2 8 10 A to 1A range current calibration test connections 2 10 3A range current calibration test connectio...

Страница 13: ...ent calibration 2 13 Remote calibration command summary 2 15 Recommended CAL PROT SENS parameter ranges 2 16 Recommended CAL PROT SOUR parameter ranges 2 16 Voltage calibration initialization commands...

Страница 14: ...B Command Reference Remote calibration command summary B 2 Recommended CAL PROT SENS parameter ranges B 6 Recommended CAL PROT SOUR parameter ranges B 7 Calibration errors B 9...

Страница 15: ...1 Performance Verification...

Страница 16: ...e is outside specified limits con tact your Keithley representative or the factory to determine the correct course of action Verification test requirements Be sure that you perform the verification te...

Страница 17: ...quipment which is shown in parentheses 90 day full range accuracy specifications of ranges required for various measurement points 90 day 5 C specifications of nominal resistance values shown Use actu...

Страница 18: ...n limits are calculated assume you are testing the 20V DC output range using a 20V output value Using the Model 2420 20V range one year accuracy specification of 0 02 of output 2 4mV offset the calcul...

Страница 19: ...t displays RESET ORIGINAL DFLTS BENCH GPIB 5 Select BENCH and then press ENTER The unit then displays RESETTING INSTRUMENT ENTER to confirm EXIT to abort 6 Press ENTER to restore bench defaults and no...

Страница 20: ...he maximum voltage between INPUT OUTPUT HI and 4 WIRE SENSE HI or between INPUT OUTPUT LO and 4 WIRE SENSE LO is 5V Exceeding these voltage values may result in instrument damage Setting the source ra...

Страница 21: ...e that can occur real and range Depending on which value is lower the output will clamp at either the displayed compliance setting real or at the maximum measurement range reading range The real compl...

Страница 22: ...ting is lower than the maximum possible reading on the present measurement range the compliance setting is the compliance limit If the compliance setting is higher than the measurement range the maxim...

Страница 23: ...is turned on 5 Verify output voltage accuracy for each of the voltages listed in Table 1 3 For each test point Select the correct source range Set the Model 2420 output voltage to the indicated value...

Страница 24: ...e the source output is turned on 5 Verify output voltage accuracy for each of the voltages listed in Table 1 4 For each test point Select the correct source range Set the Model 2420 output voltage to...

Страница 25: ...the multimeter DC current measuring function 3 Press the Model 2420 SOURCE I key to source current and make sure the source output is turned on Table 1 4 Voltage measurement accuracy limits Model 242...

Страница 26: ...tput is turned on 4 Verify output current accuracy for the 3A range Be sure to Select the 3A source range Set the Model 2420 output current to the correct 3A output value Verify that the multimeter re...

Страница 27: ...acy for the 10 A 1A range currents listed in Table 1 6 For each measurement Select the correct source range Set the Model 2420 source output to the correct value as measured by the digital multimeter...

Страница 28: ...eading is within the 3A limits given in the Table 1 6 NOTE It may not be possible to set the current source to the specified 3A value Use the clos est possible setting and modify reading limits accord...

Страница 29: ...d reading limits should take the additional uncertainty into ac count If using the Fluke 5450A resistance calibrator you cannot use the Auto Ohms mode of the Model 2420 to verify the 2 range The 1A te...

Страница 30: ...dify reading limits accordingly Select the appropriate ohms measurement range with the RANGE keys Verify that the Model 2420 resistance reading is within the limits given in the table 6 Repeat the ent...

Страница 31: ...2 Calibration...

Страница 32: ...humidity Conduct the calibration procedures at an ambient temperature of 18 28 C 65 82 F with rel ative humidity of less than 70 unless otherwise noted Warm up period Allow the Model 2420 to warm up...

Страница 33: ...d is 250V peak Exceeding this value may cause a breakdown in in sulation creating a shock hazard CAUTION The maximum voltage between INPUT OUTPUT HI and LO or 4 WIRE SENSE HI and LO is 75V peak The ma...

Страница 34: ...password as explained in the following paragraphs Unlocking calibration from the front panel 1 Press the MENU key and then choose CAL and press ENTER The instrument will dis play the following CALIBRA...

Страница 35: ...bration by remote To unlock calibration via remote send the following command CAL PROT CODE password For example the following command uses the default password CAL PROT CODE KI002420 Table 2 2 Calibr...

Страница 36: ...Changing the password by remote To change the calibration password by remote first send the present password and then send the new password For example the following command sequence changes the passw...

Страница 37: ...ng comprehensive calibration the instrument will display an appro priate error message see Appendix B The unit will then prompt you to repeat the calibration step that caused the error Remote error re...

Страница 38: ...g is not used Remote sensing may be used if desired but it is not essential when using the recommend ed digital multimeter 2 From normal display press the SOURCE V key 3 Press the EDIT key to select t...

Страница 39: ...V CAL Press ENTER to Output 200 00mV 13 Press ENTER The Model 2420 will source 200mV and display the following DMM RDG 200 0000mV Use ENTER or EXIT 14 Note and record the DMM reading and then adjust...

Страница 40: ...______ mV ___________ mV ___________ mV 2V 2 0000V 0 0000V 2 0000V 0 0000V ___________ V ___________ V ___________ V ___________ V 20V 20 000V 00 000V 20 000V 00 000V ___________ V ___________ V _____...

Страница 41: ...within 10 of the present range 9 After adjusting the display to agree with the DMM reading press ENTER The instru ment will then display the following I CAL Press ENTER to Output 00 000 A 10 Press ENT...

Страница 42: ...t the appropriate source range with the EDIT and up RANGE keys before calibrating each range 21 After calibrating the 1A range connect the 1 characterized resistor and DMM to the Model 2420 INPUT OUTP...

Страница 43: ...K EXECUTE VIEW DATES SAVE LOCK CHANGE PASSWORD Source range Source current Multimeter current reading 10 A 10 000 A 00 000 A 10 000 A 00 000 A ___________ A ___________ A ___________ A ___________ A 1...

Страница 44: ...ATION COMPLETE Press ENTER to confirm EXIT to abort 9 Press ENTER to save the calibration data or press EXIT to abort without saving cali bration data The following message will be displayed CALIBRATI...

Страница 45: ...6 and Table 2 7 Note that each sense range requires three parameters zero negative full scale and positive full scale Similarly each source range requires four parameters two zero parameters a positiv...

Страница 46: ...6 100 A 1E 6 to 1E 6 90E 6 to 110E 6 90E 6 to 110E 6 1mA 1E 5 to 1E 5 0 9E 3 to 1 1E 3 0 9E 3 to 1 1E 3 10mA 1E 4 to 1E 4 9E 3 to 11E 3 9E 3 to 11E 3 100mA 1E 3 to 1E 3 90E 3 to 110E 3 90E 3 to 110E 3...

Страница 47: ...ROT CODE command is sent the instrument will assume the operating states listed in Table 2 2 3 Perform the range calibration steps listed in Table 2 9 for all ranges For each range Send the SOUR VOLT...

Страница 48: ...example CAL PROT SOUR 1 02E 3 Table 2 8 Voltage calibration initialization commands Remote sensing may be used if desired but is not essential when using the recommended digital multimeter To use remo...

Страница 49: ...source range 2 SOUR VOLT Source_value Establish negative full range polarity 3 Take DMM reading Read actual output value 4 CAL PROT SOUR DMM_Reading Calibrate sense function negative full scale 5 Che...

Страница 50: ...d record the multimeter reading Send the source and sense commands using the multimeter reading as the param eter For example CAL PROT SOUR 1 03E 3 CAL PROT SENS 1 03E 3 Send the SOUR CURR 0 0 command...

Страница 51: ...2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 SOUR CURR RANGE Range SOUR CURR Source_value Take DMM reading CAL PROT SOUR DMM_Reading Check 2420 for errors CAL PROT SENS DMM_Reading Check 242...

Страница 52: ...bration procedure CAL PROT LOCK Single range calibration Normally the complete calibration procedure should be performed to ensure that the entire instrument is properly calibrated In some instances h...

Страница 53: ...3 Routine Maintenance...

Страница 54: ...place the fuse with the type specified in Table 3 1 CAUTION To prevent instrument damage use only the fuse type specified in Table 3 1 3 Re install the fuse carrier CAUTION FOR CONTINUED PROTECTION AG...

Страница 55: ...inues to blow a circuit malfunction exists and must be corrected Refer to the troubleshooting section of this manual for additional in formation Table 3 1 Power line fuse Line voltage Rating Keithley...

Страница 56: ...3 4 Routine Maintenance...

Страница 57: ...4 Troubleshooting...

Страница 58: ...ded that you send the unit back to the factory for re pairs or limit repairs to the PC board replacement level Without proper equipment and training you could damage a PC board beyond repair Repairs w...

Страница 59: ...back out of the menu structure DISPLAY PATTERNS test The display test lets you verify that each pixel and annunciator in the vacuum fluorescent dis play is working properly Perform the following steps...

Страница 60: ...troubleshooting tests and procedures covered in this section of the manual Refer to the following drawings Figure 4 1 Overall block diagram Figure 4 2 Analog circuitry block diagram Figure 4 3 Power...

Страница 61: ...Power Supply Output Stage Power Supply Digital Power Supply Line In Power Supply DACs Clamps Output Stage Feedback Front Panel Controller Trigger Digital I O RS 232 Trigger Link Figure 4 1 Overall bl...

Страница 62: ...hich provides the necessary voltage and current gain to drive the output Sense resistors in the HI output lead provide output current sensing and a separate sense resistor is used for each current ran...

Страница 63: ...ly is set to program the flash ROM See Digital circuitry below A constant frequency switching supply runs off the 24VD supplies and generates all the float ing and output supply voltages for the analo...

Страница 64: ...nt equivalent of the source voltage will appear on the guard terminal If the unit is in the SI mode the voltage on output HI is equal to the source cur rent multiplied by the external resistance value...

Страница 65: ...is gen erated on the digital board DS901 is the VFD vacuum fluorescent display module which can display up to 49 charac ters Each character is organized as a 5 7 matrix of dots or pixels and includes...

Страница 66: ...ized below Display board checks If the front panel display tests indicate that there is a problem on the display board useTable 4 1 See Principles of operation for display circuit theory Table 4 1 Dis...

Страница 67: ...nced to TP500 Table 4 3 Digital circuitry checks Step Item component Required condition Remarks 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 Power on test U3 pin 19 U3 pin 7 U3 pin 68 U3 lines A0 A19 U3...

Страница 68: ...the case cover and analog board assembly See Section 5 Battery replacement precautions WARNING There is a danger of explosion if battery is incorrectly replaced Replace only with the same or equivalen...

Страница 69: ...r has stopped communicating with the main processor which is located on the digital board This error indicates that one of the main processor ROMs may require re seating in its socket ROMs may be rese...

Страница 70: ...4 14 Troubleshooting...

Страница 71: ...5 Disassembly...

Страница 72: ...loves Only handle PC boards by the edges and shields Do not touch any board traces or components not associated with repair Do not touch areas adjacent to electrical contacts Use dry nitrogen gas to c...

Страница 73: ...p solder irons Once the device is installed in the PC board it is normally adequately protected and you can handle the boards normally Assembly drawings Use the assembly drawings located at the end of...

Страница 74: ...ss to the components under the analog board shield remove the shield which is secured to the analog board by a single screw Analog board removal Perform the following steps to remove the analog board...

Страница 75: ...air of output transistors Digital board removal Perform the following steps to remove the digital board This procedure assumes that the an alog board assembly is already removed NOTE In order to remov...

Страница 76: ...pad by pulling it from the front panel Removing power components The following procedures to remove the power supply and or power module require that the case cover and motherboard be removed as prev...

Страница 77: ...y made To en sure proper operation replace the analog signal wire ferrite noise filters and securely fasten the shield WARNING To ensure continued protection against electrical shock verify that power...

Страница 78: ...5 8 Disassembly...

Страница 79: ......

Страница 80: ......

Страница 81: ......

Страница 82: ......

Страница 83: ......

Страница 84: ...6 Replaceable Parts...

Страница 85: ...be sure to include the following information Instrument model number Model 2420 Instrument serial number Part description Component designation if applicable Keithley part number Factory service If t...

Страница 86: ...AP 1UF 10 25V CERAMIC C 495 1 C256 257 CAP 22PF 10 100V CERAMIC C 451 22P C267 268 327 CAP 1000P 10 100V CERAMIC C 451 1000P C273 282 284 289 305 310 321 322 CAP 1UF 10 25V CERAMIC C 495 1 C283 CAP 10...

Страница 87: ...20 25V TANTALUM C 440 22 C618 625 650 652 659 662 262 263 CAP 1UF 10 25V CERAMIC C 495 1 CR200 203 205 207 208 210 216 221 235 DIODE SWITCHING MMBD914 RF 83 CR206 209 230 233 400 401 222 223 DIODE IN...

Страница 88: ...229 TRANS N MOSFET VN0605T TG 243 Q242 243 TRANS N CHAN MOSFET TN254ON8 TG 274 Q247 520 601 529 228 248 TRANS PNP MMBT3906L TG 244 Q249 TRANS NPN SILICON BC846BL TG 278 Q250 TRANS PNP BC 856BL TG 287...

Страница 89: ...263 264 267 RES 100K 1 100MW THICK FILM R 418 100K R205 310 485 552 667 RES 0499 1 100MW THICK FILM R 418 0499 R207 RES 20K 1 125W THIN FILM R 456 20K R210 208 RES 768 1 100MW THICK FILM R 418 768 R21...

Страница 90: ...361 362 365 369 336 353 481 RES 1K 1 100MW THICK FILM R 418 1K R341 342 505 RES 13K 1 100MW THICK FILM R 418 13K R354 437 RES 560K 5 250MW METAL FILM R 376 560K R363 RES NET 1 1W TF 259 R364 370 371...

Страница 91: ...11K R516 523 RES 4 02K 1 100MW THICK FILM R 418 4 02K R517 524 564 565 566 567 RES 12 1 1 125MW METAL FILM R 391 12 1 R521 RES 2M 1 100MW THICK FILM R 418 2M R529 530 532 534 RES 249 1 100MW THICK FI...

Страница 92: ...R 418 1K R710 RESISTOR R 474 065 RT200 POLYSWITCH PTC RESISTOR RT 17 RT500 THERMISTER PD 7MW DEG C 1500V 613 74K RT 8 TP218 225 CONN TEST POINT CS 553 TP500 510 TP227 228 230 235 200 215 CONN TEST POI...

Страница 93: ...OR LM393D IC 775 U503 IC 5V VOLTAGE REGULATOR LM2940CT IC 576 U504 IC POS VOLTAGE REG 15V 500MA 78M15 IC 194 U505 IC NEG VOLTAGE REG 15V 500MA 79M15 IC 195 U600 264 206 207 208 233 IC DUAL PICOAMP OP...

Страница 94: ...4732A DZ 67 VR410 601 604 DIODE ZENER 3 3V MMBZ5226BL DZ 94 VR500 501 DIODE ZENER 6 0V BZX84B6V2 DZ 87 VR502 503 DIODE ZENER 12V MMSZ12T1 DZ 112 VR600 DIODE ZENER 6 4V IN4579 DZ 73 VR602 603 DIODE ZEN...

Страница 95: ...75 92 CAP 1UF 10 25V CERAMIC C 495 1 C2 56 76 78 8 80 82 87 88 89 44 46 CAP 01UF 10 50V CERAMIC C 491 01 C24 96 CAPACITOR POLYESTER C 553 1 C27 32 34 36 CAP 1UF 20 50V CERAMIC C 519 1 C28 CAP 47P 5 10...

Страница 96: ...3 CR6 12 40 41 ULTRAFAST POWER RECTIFIER RF 105 CR8 11 17 21 25 28 31 19 DIODE SWITCHING 250MA BAV103 RF 89 CR9 RECTIFIER RF 120 F1 POLYSWITCH SMD030 2 FU 103 F2 FUSE 3A FU 107 1 HS1 2 HEAT SINK HS 38...

Страница 97: ...S 1K 1 100MW THICK FILM R 418 1K R2 13 4 52 14 19 34 35 50 58 63 68 62 75 RES 10K 1 100MW THICK FILM R 418 10K R22 RES 4 02K 1 100MW THICK FILM R 418 4 02K R25 28 49 RES 4 75K 1 100MW THICK FILM R 418...

Страница 98: ...200 R99 107 RES 150K 1 100MW THICK FILM R 418 150K RT101 INRUSH CURRENT LIMITER RT 23 RV1 VARISTOR VR 10 RV101 METAL OXIDE VARISTOR VR 7 S01 2 SOCKET PLCC 032 T A SO 143 32 S1 SWITCH PUSHBUTTON 6 POL...

Страница 99: ...VOLTAGE REGULATOR LM340 12 IC 60 U3 MICROCONTROLLER MC68332 FC LSI 161 U4 IC 5V RS 232 TRANSCEIVER MAX202 IC 952 U5 IC OP AMP AD705JR IC 814 U6 IC OCTAL INTER BUS TRANS 75161 IC 647 U7 IC 4 CHANNEL P...

Страница 100: ...DISPLAY DD 51C J1032 CONN BERG CS 339 J1033 CONN HEADER STRAIGHT SOLDER PIN CS 368 16 Q901 902 TRANS NPN GEN PURPOSE BC868 TG 293 R901 RES NET 15K 2 1 875W TF 219 15K R902 RES 13K 5 125MW METAL FILM...

Страница 101: ...CK PUSH IN RED BJ 14 2 BANANA JACK PUSH IN BLUE BJ 14 6 BANANA JACK PUSH IN WHITE BJ 14 9 HOLDER FERRITE 2001 367A PC BOARD STOP 2001 371A SWITCHPAD 2400 315A HEAT SINK 2420 308A BOTTOM SHIELD 2420 30...

Страница 102: ......

Страница 103: ......

Страница 104: ......

Страница 105: ......

Страница 106: ......

Страница 107: ...A Specifications...

Страница 108: ...18 C 28 50 C 0 15 accuracy specification C MAX OUTPUT POWER 22W 66W for Model 2420 110W for Model 2425 and 2430 55W for Model 2440 four quadrant source or sink operation SOURCE SINK LIMITS Model 2400...

Страница 109: ...400 2410 1 00000 A 10 pA 1mV 0 029 300 pA All 10 0000 A 100 pA 1mV 0 027 700 pA 100 000 A 1 nA 1mV 0 025 6 nA 1 00000 mA 10 nA 1mV 0 027 60 nA 2400 2420 2425 2430 2440 10 0000 mA 100 nA 1mV 0 035 600...

Страница 110: ...IONS 89mm high 213mm wide 370mm deep 31 2 in 83 8 in 149 16 in Bench Configuration with handle feet 104mm high 238mm wide 370mm deep 41 8 in 93 8 in 149 16 in WEIGHT 3 21kg 7 08 lbs Model 2425 2430 24...

Страница 111: ...s the actual reading range is 10V 2 5mV or from 9 9975 to 10 0025V Current measurement calculations are performed in exactly the same manner using the perti nent specifications ranges and input signal...

Страница 112: ...A 6 Specifications...

Страница 113: ...B Command Reference...

Страница 114: ...egative full scale step Ranges that were successfully calibrated will be saved if calibration is unlocked Ranges that failed will not be saved Command Description CALibration PROTected CODE password C...

Страница 115: ...once before performing calibration Do not send CODE before each calibration step To change the code first send the present code then send the new code The password parameter must be enclosed in singl...

Страница 116: ...cept for LOCK Note Calibration will be only temporary unless the SAVE command is sent to per manently store calibration constants Calibration data will not be saved if 1 calibration was not unlocked b...

Страница 117: ...2 select the range being calibrated and 3 send the CAL PROT SENS command for each parameter listed in Table B 2 Note When the Model 2420 receives this command it will attempt to place the pa rameter i...

Страница 118: ...of the four allowed ranges an error number 222 Parameter data out of range will be generated Once the unit has successfully selected the appropriate parameter range it will then check to see if ifthe...

Страница 119: ...ll range for zero parameters 75 of full scale to 150 of full scale for full range parameters but ranges listed above should be observed for optimum calibration Source range First parameter negative fu...

Страница 120: ...ing any calibration step the Model 2420 will generate an appropriate error message Several methods to detect calibration errors are discussed below Reading the error queue As with other Model 2420 err...

Страница 121: ...tatus byte then test bit 2 to see if it is set If the EAV bit is set an error has occurred and you can use the appropriate error query to read the error and at the same time clear the EAV bit in the s...

Страница 122: ...an also be used to detect the completion of each calibration step In order to use OPC to detect the end of each calibration step do the following 1 Enable operation complete by sending ESE 1 This comm...

Страница 123: ...Model 2420 To use this method send both ESE 1 and SRE 32 to the instrument then include the OPC command at the end of each calibration command line as covered above Clear the SRQ by querying the ESR u...

Страница 124: ...B 12 Command Reference...

Страница 125: ...C Calibration Programs...

Страница 126: ...ou will need the following computer software Microsoft QBasic supplied with MS DOS 5 0 or later MS DOS version 5 0 or later HP style Universal Language Driver CECHP EXE supplied with Keithley and CEC...

Страница 127: ...TE Be sure to change the OneOhm parameter to the characterized value of 1 resistor See Section 2 for details 7 Check thoroughly for errors then save it using a convenient filename 8 Run the program an...

Страница 128: ...0 NDIG 7 TRIG LINE FUNC DCV AUTO OneOhm 1 Use characterized 1 ohm value CLS PRINT Model 2420 Calibration Program PRINT Connect DMM volts input to Model 2420 INPUT OUTPUT jacks GOSUB KeyCheck FOR J 1 T...

Страница 129: ...T DATE D LINE INPUT Enter calibration due date yyyy mm dd D PRINT 1 OUTPUT 24 CAL PROT NDUE D PRINT 1 OUTPUT 24 CAL PROT SAVE Save calibration constants GOSUB ErrCheck PRINT 1 OUTPUT 24 CAL PROT LOCK...

Страница 130: ...22 24 CLOSE END VoltsInit Calibration command lists DATA RST SOUR FUNC VOLT SENS CURR PROT 0 1 DATA SENS CURR RANG 0 1 SOUR VOLT PROT LEV MAX SYST RSEN OFF DATA CAL PROT CODE KI002420 OUTP STAT ON Vo...

Страница 131: ...T 24 SENS FUNC VOLT DC PRINT 1 OUTPUT 24 SOUR FUNC VOLT PRINT 1 OUTPUT 24 CAL PROT CODE KI002420 Unlock calibration Range 2 Initial range 200mV PRINT Model 2420 Voltage Calibration Constants PRINT DO...

Страница 132: ...on Programs LINE INPUT 2 Data PRINT Data Range Range 10 IF Range 9 AND Range 11 THEN Range 3 LOOP WHILE Range 3 PRINT 1 OUTPUT 24 CAL PROT LOCK Lock out calibration PRINT 1 OUTPUT 24 RST PRINT 1 LOCAL...

Страница 133: ...are requirements C 2 Current measurement accuracy 1 13 D Detecting calibration errors B 8 Detecting calibration step completion B 10 Determining compliance limit 1 8 Digital board removal 5 5 Digital...

Страница 134: ...ing calibration constants C 7 Resetting the calibration password 2 6 Resistance limits calculation 1 4 Resistance measurement accuracy 1 15 Restoring factory defaults 1 5 Routine maintenance 1 1 S Set...

Страница 135: ...Unstable Overload Will not read applied input Calibration only Certificate of calibration required Data required attach any additional sheets as necessary Show a block diagram of your measurement inc...

Страница 136: ...Landsberger Strasse 65 D 82110 Germering 089 84 93 07 40 Fax 089 84 93 07 34 GREAT BRITAIN Keithley Instruments Ltd The Minster 58 Portman Road Reading Berkshire RG30 1EA 0118 9 57 56 66 Fax 0118 9 5...

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