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Calibration

2-13

2.10.1 Recommended equipment for low-level

calibration

Table 2-6 summarizes recommended equipment for low-lev-
el calibration. Alternate equipment may be used as long as
corresponding specifications are at least as good as those list-
ed in the table. See Appendix D for a list of alternate calibra-
tion sources.

2.10.2 Low-level calibration summary

Table 2-7 summarizes the steps necessary to complete the
low-level calibration procedure. The procedure must be per-
formed in the order shown in the table. Calibration com-
mands shown are to be used when calibrating the unit over
the IEEE-488 bus.

Table 2-6

Recommended equipment for low-level calibration

Mfg.

Model

Description

Specifications*

Fluke

5700A

Calibrator

±5ppm basic uncertainty.
DC voltage:

0V: ±0.75µV
-2V, +2V: ±5ppm
20V: ±5ppm

DC current:

200mA: ±65ppm
2A: ±90ppm

AC voltage:

0.5mV @ 1kHz: ±10000ppm
5mV @ 100kHz: ±2400ppm
200mV @ 1kHz: ±150ppm
1.5V @ 1kHz: ±80ppm
20V @ 1kHz: ±80ppm
20V @ 30kHz: ±140ppm
200V @ 1kHz: ±85ppm
200V @ 30kHz: ±240ppm

AC current:

20mA @ 1kHz: ±160ppm

Resistance:

19k¾: ±11ppm
1M¾: ±18ppm

Keithley

3930A

Synthesizer

2V rms @ 1Hz

Keithley

8610

Low-thermal shorting plug

* 90-day calibrator specifications shown include total uncertainty at specified output. The ±2V outputs include 0.5ppm transfer
uncertainty. See Appendix D for a list of alternate calibration sources.

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Содержание 2001

Страница 1: ...Model 2001Multimeter Calibration 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 2: ...Model 2001 Multimeter Calibration Manual 1992 Keithley Instruments Inc All rights reserved Cleveland Ohio U S A Seventh Printing May 2004 Document Number 2001 905 01 Rev G...

Страница 3: ...SIVE REMEDIES NEITHER KEITHLEY INSTRUMENTS INC NOR ANY OF ITS EMPLOYEES SHALL BE LIABLE FOR ANY DIRECT INDIRECT SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OF ITS INSTRU MENTS A...

Страница 4: ...w Revision includes a revised copy of this print history page Revision A Document Number 2001 905 01 April 1992 Revision B Document Number 2001 905 01 June 1992 Revision C Document Number 2001 905 01...

Страница 5: ...that a shock hazard exists when voltage levels greater than 30V RMS 42 4V peak or 60VDC are present A good safety practice is to ex pect that hazardous voltage is present in any unknown circuit before...

Страница 6: ...lectric shock and fire replacement components in mains circuits including the power transformer test leads and input jacks must be purchased from Keithley Instru ments Standard fuses with applicable n...

Страница 7: ...ification 1 11 1 8 5 Resistance verification 1 13 1 8 6 Frequency accuracy verification 1 16 1 8 7 Temperature reading checks 1 17 2 Calibration 2 1 Introduction 2 1 2 2 Environmental conditions 2 1 2...

Страница 8: ...n procedure 2 15 2 10 4 IEEE 488 bus low level calibration procedure 2 18 3 Calibration Command Reference 3 1 Introduction 3 1 3 2 Command summary 3 1 3 3 CALibration PROTected subsystem 3 3 3 3 1 LOC...

Страница 9: ...resistance verification 2M 200M ranges 1 15 Figure 1 8 1G resistor test box construction 1 15 Figure 1 9 Connections for frequency accuracy verification 1 16 2 Calibration Figure 2 1 Low thermal short...

Страница 10: ...0 Frequency verification limits 1 16 Table 1 11 Thermocouple temperature reading checks 1 17 Table 1 12 RTD probe temperature reading checks 1 18 2 Calibration Table 2 1 IEEE 488 bus calibration comma...

Страница 11: ...ices Table B 1 Recommended equipment for comprehensive calibration B 2 Table B 2 Recommended equipment for low level calibration B 2 Table C 1 Calibration errors C 2 Table D 1 Alternate calibration so...

Страница 12: ...nges during testing 1 5 Recommended equipment Summarizes recom mended equipment and pertinent specifications 1 6 Verification limits Explains how reading limits were calculated 1 7 Restoring factory d...

Страница 13: ...tions 1 7 Restoring default conditions Before performing each performance verification procedure restore instrument bench default conditions as follows 1 From the normal display mode press the MENU ke...

Страница 14: ...rmal cable set Keithley CA 18 1 Low capacitance cable Low capacitance dual banana to dual banana shielded cable for ACV 1 2m 4 ft in length Keithley R 289 1G 1G resistor NOTE Resistor should be charac...

Страница 15: ...ed low thermal connections when testing the 200mV range to avoid er rors caused by noise or thermal offsets Connect the shield to calibrator output LO See Table 1 1 2 Connect the Model 2001 to the cal...

Страница 16: ...t HI Output HI Input LO Output LO Model 2001 5700A Calibrator Output DC Voltage Note Use shielded low thermal cables when testing 200mV range Use internal Guard EX GRD LED is off Ground link installed...

Страница 17: ...SCAN CONFIG MENU EXIT ENTER RANGE AUTO FILTER MATH RANGE 2001 MULTIMETER SENSE 4 WIRE HI INPUT LO INPUTS CAL 500V PEAK F R FRONT REAR 2A 250V AMPS 350V PEAK 1100V PEAK 1 900000 VAC RMS Input HI Output...

Страница 18: ...SCAN CONFIG MENU EXIT ENTER RANGE AUTO FILTER MATH RANGE 2001 MULTIMETER SENSE 4 WIRE HI INPUT LO INPUTS CAL 500V PEAK F R FRONT REAR 2A 250V AMPS 350V PEAK 1100V PEAK 1 900000 VAC RMS BNC to dual ba...

Страница 19: ...89856V to 1 90144V 1 89647V to 1 90353V 1 89000V to 1 91000V 1 86000V to 1 94000V 1 80100V to 1 99900V 20V 19V 18 8716V to 19 1284V 18 9685V to 19 0315V 18 9856V to 19 0144V 18 9809V to 19 0192V 18 97...

Страница 20: ...1 9V 19V 190V 750V 189 837mV to 190 163mV 1 89837V to 1 90163V 18 9818V to 19 0182V 189 811V to 190 189V 189 875mV to 190 125mV 1 89875V to 1 90125V 18 9856V to 19 0144V 189 849V to 190 151V 748 72V...

Страница 21: ...434V 1 373V to 1 455V 1 330V to 1 498V 1 281V to 1 547V 20V 10V 13 99V to 14 29V 13 98V to 14 30V 13 98V to 14 30V 13 97V to 14 31V 13 96V to 14 32V 13 86V to 14 42V 13 65V to 14 63V 13 22V to 15 06V...

Страница 22: ...ng ranges and frequencies listed in Table 1 7 1 8 4 AC current verification AC current verification is performed by applying accurate AC currents at specific frequencies and then verifying that Model...

Страница 23: ...o 191 645mA 189 657mA to 190 344mA 189 742mA to 190 258mA 189 685mA to 190 315mA 2A 1 90000A 1 88250A to 1 91750A 1 89556A to 1 90444A 1 89390A to 1 90610A 1 89105A to 1 90895A Note Reading limits sho...

Страница 24: ...the calibrator to output 19 000 and allow the read ing to settle Verify that the reading is within the limits stated in Table 1 8 NOTE Resistance values available in the Model 5700A calibrator may be...

Страница 25: ...for resistance verification 20 200k ranges NEXT DISPLAY PREV POWER DCV ACV DCI ACI 2 4 FREQ TEMP REL TRIG STORE RECALL INFO LOCAL CHAN SCAN CONFIG MENU EXIT ENTER RANGE AUTO FILTER MATH RANGE 2001 MUL...

Страница 26: ...s to minimize noise Enable calibrator external sense mode Use internal Guard EX GRD LED is off Sense HI Sense LO Sense HI Sense LO Ground link installed 5700A Calibrator Output 4 wire Resistance Figur...

Страница 27: ...hen press ENTER E Press EXIT to return to normal display 7 Verify that the Model 2001 frequency reading is within the limits shown in the first line of Table 1 10 8 Set the synthesizer to each of the...

Страница 28: ...ace the Model 2001 in the tem perature display mode Refer to further information be low on how to check thermocouple and RTD probe readings Thermocouple temperature reading checks To check thermocoupl...

Страница 29: ...ons between the decade resis tance box and the Model 2001 Table 1 12 RTD probe temperature reading checks RTD probe type Applied resistance Displayed temperature C PT385 0 00385055 64 30 100 109 73 13...

Страница 30: ...length of time the Model 2001 should be allowed to warm up before cal ibration 2 4 Line power States the power line voltage limits when calibrating the unit 2 5 Calibration lock Explains how to unlock...

Страница 31: ...L switch to unlock Note that it is not necessary to unlock calibration for the AC only self calibration procedure If the CAL switch is pressed with calibration already un locked the following message...

Страница 32: ...quest next due cal date from 2001 Low level calibration subsystem Request low level CAL switch state 0 locked 1 unlocked 20V AC at 1kHz step 20V AC at 30kHz step 200V AC at 1kHz step 200V AC at 30kHz...

Страница 33: ...CAL PROT LLEV CALC command will be executed The 15 low level calibration steps must be executed in order step 1 through step 15 Step 1 is always a valid next step which allows you to restart the low...

Страница 34: ...rnal hardware problems Refer to Appendix C for a com plete listing of all Model 2001 calibration error messages Table 2 2 Calibration error messages Error ID code Error message 222 438 439 440 Paramet...

Страница 35: ...librator Low thermal shorting plug 5ppm basic uncertainty DC voltage 2V 5ppm 20V 5ppm Resistance 19k 11ppm 1M 18ppm 90 day calibrator specifications shown include total uncertainty at specified output...

Страница 36: ...bration 1 When the DC zero calibration step is completed the fol lowing message will be displayed CONNECT 2 VDC CAL 2 Disconnect the low thermal short and connect the DC calibrator to the INPUT jacks...

Страница 37: ...AMPS 350V PEAK 1100V PEAK Input HI Output HI Input LO Output LO Model 2001 5700A Calibrator Note Use shielded cables to minimize noise Enable or disable calibrator external sense as indicated in proce...

Страница 38: ...alibration constants from the proce dure just completed press ENTER 3 If you do not want to save calibration constants from the procedure just completed and wish instead to restore previous constants...

Страница 39: ...alculate constants Check for errors Perform user AC cal Check for errors Save calibration dates Save calibration constants Lock out calibration CAL PROT DC ZERO CAL PROT DC LOW value CAL PROT DC HIGH...

Страница 40: ...3 Wait until the Model 2001 finishes 1M calibration be fore continuing Step 7 Open circuit calibration 1 Disconnect all test leads from the Model 2001 INPUT and SENSE jacks 2 Send the following comman...

Страница 41: ...ss ENTER The instru ment will display the following message AC CALIBRATION PHASE Open circuit inputs press ENTER 5 Press ENTER to begin AC calibration which will take about six minutes to complete Dur...

Страница 42: ...be used when calibrating the unit over the IEEE 488 bus Table 2 6 Recommended equipment for low level calibration Mfg Model Description Specifications Fluke 5700A Calibrator 5ppm basic uncertainty DC...

Страница 43: ...CAL PROT LLEV STEP 7 CAL PROT LLEV STEP 8 CAL PROT LLEV STEP 9 CAL PROT LLEV STEP 10 CAL PROT LLEV STEP 11 CAL PROT LLEV STEP 12 CAL PROT LLEV STEP 13 CAL PROT LLEV STEP 14 CAL PROT LLEV STEP 15 CAL...

Страница 44: ...point you can use the cursor and range keys to set the calibration voltage to a value from 0 98 to 2 1V if your calibrator cannot output 2V 12 Press ENTER The instrument will display the follow ing d...

Страница 45: ...inals as shown in Figure 2 3 35 Press ENTER The instrument will display the follow ing Connect 20V 1kHz 36 Set the calibrator to output 20V AC at a frequency of 1kHz then press ENTER The instrument wi...

Страница 46: ...in progress Low Level Cal Step 9 of 15 53 After this step has been completed the unit will display the following Connect 2 VDC 54 Set the calibrator for an output voltage of 2V DC then press ENTER The...

Страница 47: ...or and range keys to set the date as desired then press ENTER Press ENTER a second time to con firm your date selection 71 The Model 2001 will then prompt you to enter the cali bration due date NEXT C...

Страница 48: ...are us ing a voltage other than 2V The allowable range is 0 98V to 2 1V NOTE For best results use the calibration values given in this part of the procedure whenev er possible Wait until the Model 20...

Страница 49: ...LEV STEP 6 25 Set the calibrator output to 5mV AC at a frequency of 100kHz Send the following command to the Model 2001 CAL PROT LLEV STEP 7 26 Program the calibrator to output 0 5mV AC at a frequen c...

Страница 50: ...ation due date by sending the following commands CAL PROT DATE 1 01 92 CAL PROT NDUE 1 01 93 40 Save calibration constants in EEPROM by sending the following command CAL PROT SAVE 41 Finally lock out...

Страница 51: ...sive AC and low level calibration 3 3 CALibration PROTected subsystem Gives detailed explanations of the various commands used for both comprehensive and low level calibration 3 4 CALibration UNPRotec...

Страница 52: ...ow level calibration subsystem Request low level CAL switch state 0 locked 1 unlocked 20V AC at 1kHz step 20V AC at 30kHz step 200V AC at 1kHz step 200V AC at 30kHz step 1 5V AC at 1kHz step 0 2V AC a...

Страница 53: ...comprehensive calibration press in on the CAL switch with power turned on To unlock low level calibration hold in the CAL switch while turning on the power Programming example 10 OUTPUT 716 CAL PROT L...

Страница 54: ...UTPUT 716 CAL PROT SAVE Save constants 3 3 4 DATA CALibration PROTected DATA Purpose To download calibration constants from the Model 2001 Format cal prot data Response Cal 1 Cal 2 Cal n Description D...

Страница 55: ...dd yy Description The DATE query allows you to request from the instrument the previously stored calibra tion date The instrument response is simply a string of ASCII characters representing the last...

Страница 56: ...ue date 30 PRINT A Display due date 3 3 9 LLEVel CALibration PROTected LLEVel Low level calibration commands are summarized in Table 3 2 Table 3 2 Low level calibration commands Command Description CA...

Страница 57: ...10 OUTPUT 716 CAL PROT LLEV SWIT Request switch status 20 ENTER 716 S Input switch status 30 PRINT S Display switch status STEP CALibration PROTected LLEVel STEP Purpose To program individual low leve...

Страница 58: ...UTPUT 716 CAL PROT LLEV STEP Request step 20 ENTER 716 S Input step 30 PRINT S Display step CALCulate CALibration PROTected LLEVel CALCulate Purpose To program the Model 2001 to calculate new low leve...

Страница 59: ...rt circuit cal LOW CALibration PROTected DC LOW Purpose To program the 2V DC comprehensive calibration step Format cal prot dc low cal_voltage Parameters Cal_voltage 1 0 to 2 0 V Description LOW progr...

Страница 60: ...OHM programs the 20k comprehensive calibration step The allowable range of the calibration resistance parameter is from 9k to 20k 9E3 to 20E3 Use the 20k value whenever possible or the closest possibl...

Страница 61: ...ormat cal prot dc calc Parameters None Description The CALCulate command should be sent to the instrument after performing all other DC calibration steps to calculate new comprehensive calibration con...

Страница 62: ...o calibration equip ment All test leads must be disconnected from the input jacks when performing user AC calibration Programming note Calibration constants generated by using the ACC command are not...

Страница 63: ...a complete listing of calibration error messages 3 5 2 Detecting calibration errors Several methods to detect calibration errors are discussed in the following paragraphs Error Queue As with other Mod...

Страница 64: ...register to set the ESB event summary bit in the status byte when op eration complete is detected 2 Send the OPC command immediately following each calibration command For example CAL PROT DC ZERO OPC...

Страница 65: ...A Model 2001 Specifications A 1...

Страница 66: ...e based on your calibration sources For example calibrating with a 10V primary standard rather than a 20V calibrator will reduce calibration uncertainty and can thereby improve total 2001 accuracyform...

Страница 67: ...2 9 7 7 1 16 7 ms 20 ms 25 61 2 57 48 42 38 54 45 43 35 48 41 39 32 0 2 3 34 ms 4 ms 22 61 2 201 186 102 113 173 162 102 99 129 127 84 83 0 1 1 67 ms 2 ms 21 51 2 201 201 126 116 175 173 105 105 129 1...

Страница 68: ...Specifications apply for 10 reading digital filter If no filter is used add 0 25 of range typical uncertainty 2 Typical values 3 Add 0 001 of reading VIN 100V 2 additional uncertainty for inputs above...

Страница 69: ...1 2 57 48 38 35 53 45 36 33 48 41 34 30 0 1 1 67 ms 2 ms 21 51 2 136 136 70 70 122 122 64 64 98 98 56 56 0 01 167 s 167 s 16 41 2 140 140 71 71 127 127 66 66 99 99 58 58 0 018 167 s 167 s 16 41 2 2000...

Страница 70: ...2 k 2100 0000 100 1 m 0 98 mA 5 V 100 0 2 V to 2 V 2 5 0 2 20 k 21 000000 1 m 10 m 89 A 5 V 1 5 k 0 2 V to 2 V 4 0 2 200 k 210 00000 10 m 100 m 7 A 5 V 1 5 k 11 0 2 2 M 4 2 1000000 100 m 1 770 nA 5 V...

Страница 71: ...at the factory 7 For TCAL 5 C following 55 minute warm up Specifications include traceability to US NIST 8 In burst mode display off Burst mode requires Auto Zero refresh by changing resolution or mea...

Страница 72: ...g of reading 20 50Hz 50 100Hz 100 200Hz rms Average 0 55 0 09 0 015 AC DC COUPLING For DC 20 of AC rms voltage apply the following additional uncertainty multiplied by the ratio DC AC rms of Reading o...

Страница 73: ...ing 3 Typical values 4 For DELAY 0 digital filter off display off internal trigger Aperture is reciprocal of line frequency These rates are for 60Hz and 50Hz 5 Actual maximum voltage burden maximum vo...

Страница 74: ...96 STAT QUE CLE 3 1 ms 322 TRG 1 2 ms 833 FUNCTION CHANGE SPEED1 AUTO ZERO OFF AUTO ZERO ON FROM TO RATE RATE Function Function Range s TIME per second TIME per second Any DCV 200mV 2V 8 1 ms 1 2 0 3...

Страница 75: ...anges 3 Auto Zero off using 386SX 16 computer average time for 1000 readings byte order swapped front panel disabled 4 Typical times for 0 01 power line cycle autorange off Delay 0 100 measurements in...

Страница 76: ...5 1 2 NORMAL CALIBRATION Type Software No manual adjustments required Sources 2 DC voltages 2V 20V and 2 resistances 19k and 1M Different calibrationsourcevaluesareallowed Allotherfunctionscalibrated...

Страница 77: ...s Keithley Model 7007 MS DOS or PC DOS version 3 3 or later Microsoft QuickBASIC version 4 0 or later IOtech Driver488 IEEE 488 bus driver Rev 2 3 or lat er NOTE recent versions of Driver488 may not s...

Страница 78: ...ended equipment for low level calibration Mfg Model Description Specifications Fluke 5700A Calibrator 5ppm basic uncertainty DC voltage 0V 0 75 V 2V 2V 5ppm 20V 5ppm DC current 200mA 65ppm 2A 90ppm AC...

Страница 79: ...filename 7 Compile and run the program and follow the prompts on the screen to perform calibration Unlocking calibration In order to unlock comprehensive calibration briefly press in on the CAL switch...

Страница 80: ...lded cables to minimize noise Enable or disable calibrator external sense as indicated in procedure Use internal Guard EX GRD LED is off Sense HI Sense LO Sense LO Sense HI Ground link installed Figur...

Страница 81: ...t LO Output LO Model 2001 5700A Calibrator Amps Ground link installed Note Use internal Guard EX GRD LED is off Figure B 5 Synthesizer connections NEXT DISPLAY PREV POWER DCV ACV DCI ACI 2 4 FREQ TEMP...

Страница 82: ...Calibration Programs B 6 Program B 1 Comprehensive calibration program for use with any suitable calibrator QuickBASIC Version...

Страница 83: ...Calibration Programs B 7 Program B 1 continued Comprehensive calibration program for use with any suitable calibrator QuickBASIC Version...

Страница 84: ...Calibration Programs B 8 Program B 2 Comprehensive calibration program for use with any suitable calibrator Turbo C Version...

Страница 85: ...Calibration Programs B 9 Program B 2 continued Comprehensive calibration program for use with any suitable calibrator Turbo C Version...

Страница 86: ...Calibration Programs B 10 Program B 2 continued Comprehensive calibration program for use with any suitable calibrator Turbo C Version...

Страница 87: ...Calibration Programs B 11 Program B 3 Comprehensive calibration program for use with Fluke 5700A calibrator QuickBASIC Version...

Страница 88: ...Calibration Programs B 12 Program B 3 continued Comprehensive calibration program for use with Fluke 5700A calibrator QuickBASIC Version...

Страница 89: ...Calibration Programs B 13 Program B 3 continued Comprehensive calibration program for use with Fluke 5700A calibrator QuickBASIC Version...

Страница 90: ...Calibration Programs B 14 Program B 4 Comprehensive calibration program for use with Fluke 5700A calibrator Turbo C Version...

Страница 91: ...Calibration Programs B 15 Program B 4 continued Comprehensive calibration program for use with Fluke 5700A calibrator Turbo C Version...

Страница 92: ...Calibration Programs B 16 Program B 4 continued Comprehensive calibration program for use with Fluke 5700A calibrator Turbo C Version...

Страница 93: ...Calibration Programs B 17 Program B 5 Low level calibration program for use with Fluke 5700A calibrator QuickBASIC Version...

Страница 94: ...Calibration Programs B 18 Program B 5 continued Low level calibration program for use with Fluke 5700A calibrator QuickBASIC Version...

Страница 95: ...Calibration Programs B 19 Program B 5 continued Low level calibration program for use with Fluke 5700A calibrator QuickBASIC Version...

Страница 96: ...Calibration Programs B 20 Program B 5 continued Low level calibration program for use with Fluke 5700A calibrator QuickBASIC Version...

Страница 97: ...Calibration Programs B 21 Program B 6 Low level calibration program for use with Fluke 5700A calibrator Turbo C Version...

Страница 98: ...Calibration Programs B 22 Program B 6 continued Low level calibration program for use with Fluke 5700A calibrator Turbo C Version...

Страница 99: ...Calibration Programs B 23 Program B 6 continued Low level calibration program for use with Fluke 5700A calibrator Turbo C Version...

Страница 100: ...Calibration Programs B 24 Program B 6 continued Low level calibration program for use with Fluke 5700A calibrator Turbo C Version...

Страница 101: ...ed over the bus by the SYST ERR query include the error ID code and message separated by a comma and the message surrounded by quotes For exam ple 438 Date of calibration not set Calibration data quer...

Страница 102: ...of spec 200 ohm 4w gain out of spec 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434...

Страница 103: ...AC range Negative peak offset for 200mV AC range Positive and negative peak offset for 2V 200V and 750V AC ranges Positive peak offset for 20V AC range Negative peak offset for 20V AC range Self calib...

Страница 104: ...1G offset 4 wire 20 gain 4 wire 20 offset 4 wire 200 gain 4 wire 200 offset 4 wire 2k gain 4 wire 2k offset 4 wire 20k gain 4 wire 20k offset 4 wire 200k gain 4 wire 200k offset 7V reference value 2V...

Страница 105: ...the alternate equipment may not be as precise for certain calibration val ues Refer to the manufacturers specifications for more de tailed information Table D 1 Alternate calibration sources Manufact...

Страница 106: ...ro o Unstable o Will not read applied input o Overload o Calibration only o Certificate of calibration required o Data required attach any additional sheets as necessary Show a block diagram of your m...

Страница 107: ...1 60 11 77 26 GERMANY Landsberger Strasse 65 82110 Germering 089 84 93 07 40 Fax 089 84 93 07 34 GREAT BRITAIN Unit 2 Commerce Park Brunel Road Theale Berkshire RG7 4AB 0118 929 7500 Fax 0118 929 7519...

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