Datron 4910 User Handbook Manual Download Page 41 | Manualshive

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Summary of Contents for 4910

Page 1: ...USER S HANDBOOK 4910 and 4911 DC Voltage Reference Standards l J ...

Page 2: ...t the back of this handbook Due to our policy of continuously updating our products this handbook may contain minor differences in specification components and circuit design to the instrument actually supplied Amendment sheets precisely matched to your instrument serial number are available on request 1990 Datron Instruments Fluke Electronics is not associated with Wavetek Wandel Goitermann Inc a...

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Page 4: ... DC Power Connection 2 5 Calibration 2 5 Preparation for Operation Hot Shipment 2 6 Immediate Checks 2 6 Line Voltage Selection and Fuse Rating 2 7 AC Line Supply Connection 2 9 DC Power Connection 2 9 Specification Verification 2 9 Mounting 2 10 SECTION 3 USING THE 491 0 491 1 4910 Front Panel Features 3 2 491 1 Front Panel Features 3 4 4910 49 1 1 Rear Panel Features 3 6 Setting Up the 4910 4911...

Page 5: ... SECTION 5 SPECIFICATION VERIFICATION AND CALIBRATION Introduction 54 Calibration Confidence check 5 2 Equipment Requirements 5_2 Interconnecting Leads 5_2 Null Detector Zeroing 5 3 Calibration Confidence check Procedure 5 4 Calibration 5 9 Introduction 5 9 Equipment Requirements 5 9 Adjustment of Unit Under Test Outputs 5 10 Interconnecting Leads 5 10 Null Detector Zeroing 542 Calibration Procedu...

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Page 7: ... which feature four separate and highly stable 10V outputs While their performance is comparable to that of saturated Weston standard cells they eliminate most of the drawbacks encountered in standard cell use and maintenance In addition to replacing saturated Weston cells as a laboratory standard the 4910 and 4911 can also be used as a readily transportable standard 1 1 ...

Page 8: ...curacy standards The individual outputs are adjustable to within microvolts of one another so that inter comparison is possible to a very high level of accuracy In addition to its four individual cell outputs and its average 10V output the49 10 also features IV and 1 018V outputs and a low impedance 10V output with 4 wire sensing In their normal operating mode the units can be powered from an ac l...

Page 9: ...vicing Handbook 850258 In addition the following optional accessories are available for use with the 4910 and 4911 Description Option Number Part Number Calibration and Hot Shipment Option 10 Drift rate characterization derived from 90 days of pre shipment measurements must be ordered with Option 10 Option 20 1 018V set to requested 6 decimal place value in the range 1 017000V to 1 019000V must be...

Page 10: ...which gives heating element see Fig 1 1 These on chip the unit its portability and ease of use components allow the chip temperature to be stabilized to within approximately 1 m C and by To eliminate temperature coefficient TC providing direct control of the zener s substrate problems the reference zener diodes are temperature they avoid the long warm up times stabilized at a constant temperature ...

Page 11: ...ences In addition the PWM divider can be controlled totally digitally and therefore contains no adjustment potentiometers which could contribute to drift The zener reference produces a highly stable output at around 7 2V which is amplified to produce an accurate 10V output Rather than using resistors to set the gain of the amplifier which would introduce unacceptable TC problems and provide no rel...

Page 12: ...f these reference circuits ensure that they are completely isolated from one another However internal shorting links are provided so that individual 10V outputs can be connected together via 200 2 resistors to provide an average 10V output see Fig 1 3 This average 10V output is provided unbuffered at front panel terminals on both the 4910 and 4911 1 6 ...

Page 13: ...d to a buffer amplifer which provides a low impedance 10V output This buffer amplifier has remote sensing on its high andlow output terminals see Fig 1 4 In addition the 4910 has two separate PWM dividers which divide down the average 10V output to provide 1 018V and IV outputs see Fig 1 5 1 7 ...

Page 14: ...the 4910 4911 can be powered from a suitable AC line supply or from its internal batteries which will maintain a 4910 fully operational for a nominal period of 9 hours and a 4911 fully operational for a nominal period of 17 hours In Normal mode an external supply connected to the External DC socket will be isolated Transit Mode In Transit mode only the zener reference module zener diode tehiperatu...

Page 15: ...r equipment will reach youin perfect condition Iftheequipmenthasbeen subject to mishandling in transit this fact will probably be visible as external damage to the shipping carton In the event of damage the shipping container and cushioning material should be kept for the carrier s inspection Unpack the equipment and check for external damage to the case sockets front panel terminals etc If damage...

Page 16: ...ne voltage indicated in the cut out below the power fuse are appropriate for your line supply NOTE to inspect the fuse rating you may have to remove the fuse by sliding the module s transparent cover to the left and pulling on the fuse extractor temperature If this is the case DO NOT use the following installation procedure Refer instead to the section titled Preparation for Operation Hot Shipment...

Page 17: ...oltage selector pc board NOTE a hole is provided in the board to assist in its removal androtate it until the appropriate line voltage appears on the left hand side of the upper surface 5 Re insert the selector pc board firmly into its slot in the module The selected line voltage should be visible in the cutout below the fuse 6 Move the fuse extractor to the right hand position 7 Insert the approp...

Page 18: ...n Fig 2 3 and insert it into its socket J 102 on the rear of the Battery Pack position A in Fig 2 3 4 Check that the four Battery LEDs situated above the CELL outputs and the Battery Supply LED situated above the AVERAGE output are continuously lit GREEN or are flashing between RED and GREEN If any of these LEDs are continuously RED flashing RED or permanently OFF the unit probably has a fault in ...

Page 19: ...s line plug DC Power Connection The 49 10 49 1 1 has a 10 to 40V EXTERNAL DC INPUT which can be used to power the unit while it is in Transit mode This input is situated on a rear panel mounted 9 way D connector for which the pin designations are shown in Fig 2 4 When an external DC supply of the correct polarity and within the 10V to 40V limits is applied to the unit an LED alongside the connecto...

Page 20: ...ion NOTE because the front panel LEDs are strobed in Transit mode to conserve battery power an individual LED must be observed for at least 30 seconds to determine its true condition Cell 1 2 3 and 4 Battery LEDs flashing GREEN or flashing RED and GREEN see NOTE below Cell 1 2 3 and 4 Temp LEDs flashing GREEN If any oftheseLEDsis in a condition other than the ones listed above the unit may have be...

Page 21: ...264V a 1 6A 250V T type fuse Supplies in the range 90V to 132V a 3 0A 250V T type fuse If the fuse rating is incorrect for your line supply voltage replace it with an appropriately rated T type fuse MAKE SURE THATONLY FUSES WITHTHE REQUIREDCURRENTRATING ANDOFTHE SPECIFIED TYPE ARE INSERTED AS REPLACEMENTS AVOID THE USE OFREPAIRED FUSES AND NEVER SHORT CIRCUIT THE FUSE HOLDER CONTACTS SUCH PRACTICE...

Page 22: ... remove the fuse 4 Remove the voltage selector pc board NOTE a hole is provided in the board to assist in its removal and rotate it until the appropriate line voltage appears on the left hand side of the upper surface 5 Re insert the selector pc board firmly into its slot in the module The selected line voltage should be visible in the cutout below the fuse 6 Move the fuse extractor to the right h...

Page 23: ...g DC Power Connection The4910 4911 has a 10 to 40V EXTERNAL DC INPUT which can be used to power the unit while it is in Transit mode This input is situated on a rear panel mounted 9 way D connector for which the pin designations are shown in Fig 2 7 When an external DC supply of the correct polarity and within the 10V to 40V limits is applied to the unit an LED alongside the connector glows GREEN ...

Page 24: ...stic feet which allow the unit to stand on a flat surface Option 90 permits the 4910 4911 to be mounted in a standard 19 inch rack The rack mounting kit will accommodate a single 4910 4911 or two 49 10 491 Is mounted alongside one another For details of how to assemble the rack mounting kit refer to Fig 2 8 ...

Page 25: ... PLATE 1U 4910 SEE DRG EA 1 4 5084 6 1 BRACKET REAR CLAMP 4910 SEE DRG EA n 4 450847 1 BLANKING PLATE HALF RACK 4910 SEE DRG EA 1 450848 1 BRACKET REAR SUPPORT 4910 SEE DRG EA 2 611056 SCREW M6 X 16 POZIPAN ST CR PL EA 34 611061 SCREW M4 X 12 POZIPAN SZP EA 12 611106 SCREW 8 32 X 5 8 POZICSK SZP EA 4 613020 WASHER M4 SZP EA 12 613021 WASHER M4 INT SHAKP EA 4 613033 WASHER M6 SZP SCIIROFF 21100 104...

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Page 27: ...Section 3 Usinajhe 4910 4911 SECTION 3 USING THE 4910 4911 3 1 ...

Page 28: ...Section 3 Using the 4910 491 1 4910 Front Panel Features I Ucltr GTl DC VOLTAGE ggiai j yyw yy flEPEMMCE S1AM0AW AWMVAWW ...

Page 29: ... WIRE OUTPUT BUFFER Provides a very low impedance 10V output with 4 wire sensing capability Can deliver output currents as high as 15mA 7 Case Terminal Connects to the units exposed metalwork NOTE It must not be used as a Safety Ground terminal 8 Guard Terminal Connects to a guard screen between the primary and secondary windings of the line input transformer Connect this terminal to the source of...

Page 30: ...Section 3 Using the 4910 491 1 4911 Front Panel Features FIG 3 2 3 4 ...

Page 31: ...A VERAGE ouput 4 10V CELL Outputs Provide high stability 10V ouputs 5 Case Terminal Connects to the unit s exposed metalwork NOTE It must not be used as a Safety Ground terminal 6 Guard Terminal Connects to a guard screen between the primary and secondary windings of the line input transformer Connect this terminal to the source of common mode noise in the system 7 10V AVERAGE Ouput Provides a low...

Page 32: ...Section 3 Using the 4910 491 T 4910 4911 Rear Panel Features FIG 3 3 3 6 ...

Page 33: ... behind the rear panel and should normally be covered by a calibration seal 3 J601 9 way V connector used to input a 10V to 40V 1A DC supply to power the unit in Transit mode 4 EXTERNAL DC INPUT LED Lights GREEN when an external DC supply of the correct polarity and within the 10V to 40V limits is applied to J601 5 1 6A Fuse Protects the EXTERNAL DC INPUT against overcurrent conditions 6 BATTERY M...

Page 34: ...ped unit can be recognised by the fact that its front panel LEDs will illuminate momentarily at approximately 3 second intervals Safety The 4910 4911 is designed to be Class 1 equipment as defined in IEC Publication 348 and to meet the requirements of UL 1244 concerning safety Protection is provided by a direct connection via the POWER CABLE from ground to exposed metal parts and internal ground s...

Page 35: ...ground loops in the measurement system might be a problem 10V Cell Outputs Provided that a cell s Average LED is lit RED then the output from that cell is completely isolated from all of the other 4910 4911 outputs As a result CELL outputs which have their Average LEDs lit RED can be connected in series to obtain total output voltages of 20 30 or 40V Section 3 Using the 4910 4911 Average Output Ea...

Page 36: ...cover Remove the top cover 3 For the cell that you wish to isolate undo each of the six link retaining screws by two turns see Fig 3 4 4 Rotate the two links from position A to position B as shown in Fig 3 4 5 Tighten down the six link retaining screws to secure the links in their new positions ensuring that the washers remain on top of the links 6 Move the two AVERAGE IN OUT slide switches to the...

Page 37: ...nal cover 4 For the cell that you wish to reconnect undo each of the six link retaining screws by two turns see Fig 3 4 5 Rotate thetwo links from position B to position A as shown in Fig 3 4 6 Tighten down the six link retaining screws to secure the links in their new positions ensuring that the washers remain on top of the links 7 Replace the unit s top cover and the two top cover retaining scre...

Page 38: ...nt such as a resistive tQ account for the effects of the currents flowing in divider can be driven with negligible error ivfoer refer to Appendix D caused by lead resistance NOTES 1 In order for the 4 WIRE OUTPUT BUFFER to be operational at least one CELL output must be internally coupled to the AVERAGE output 2 If the AVERAGE output or any of the CELL outputs that are connected to it is loaded to...

Page 39: ...ternal battery which powers the analog circuitry within the cell In addition the 4910 491 1 has a Battery Supply LED which indicates the operational status ofa separatebattery whichpowers the unit s digital circuitry and in the case of the 49 10 only the 4 WIRE OUTPUT BUFFER and the DIVIDED OUTPUTS Possible combinations of LED colours are given below with the indicated battery condition and any re...

Page 40: ...he4910 4911 Servicing Handbook or your local service center 5 Check the unit s calibration using the procedure detailed in Sect 5 of this handbook Line Supply LED The 4910 4911 has a single Line Supply LED which indicates whether the unit is operating from an AC line input This LED is lit GREEN if the unit is operating from an AC line supply and is OFF whenthe unitis notoperating from an ACline su...

Page 41: ... connector can be used to monitorthe discharge of the internal batteries In order to ensure that the integrity ofthe unit s calibration is maintained none of the batteries should be allowed to discharge beyond a terminal voltage of 16V NOTE The BATTERY CHARGE VOLTAGE outputs have an output resistance of lOkO This should be taken into account if measurements are being made with a low input impedanc...

Page 42: ...ed in Normal mode from an AC line supply for at least 48 hours This will ensure that the internal batteries are fully charged 2 Disconnect all external loads from the unit s front panel terminals 3 Turn off the AC line supply and disconnect the AC power cable 4 Leave the unit for 15 minutes 5 Check that all of the Battery LEDs and the Battery Supply LED on the unit s front panel are lit GREEN If a...

Page 43: ...onal status of the same composite battery pack Possible combinations of LED colours are given below with the indicated battery condition and any required action 1 Flashing GREEN Battery pack OK No action required 2 Flashing RED GREEN Battery pack OK but requires recharging Connect the unit to an AC line supply or connect it to a 10 to 40V external DC supply via the rear panel EXTERNALDC INPUT as s...

Page 44: ...lit GREEN if the unit is operating from an AC line supply and is OFF when the unit is not operating from an AC line supply Transit Normal Mode Switching To switch the4910 4911intoNormal modecairy out the following procedure To Switch from Transit Mode to NormalMode 1 Connect the 4910 4911 to a suitable AC line supply unless it is intended that the unit continues to be operated from its internal ba...

Page 45: ...se form 5 parallel banks each of 3 insoles Battery Capacity 10A H total at 18V Energy 648kJ To ensure full capacity and hence achieve full backup time in Normal or Transit mode the 4910 11 must be charged by the instrument operating in Normal mode for a continuous period of 48 hours Height 182mm 7 17ins including feet 177mm 7ins without feet Width 214mm 8 43ins Overall depth 591mm 23J27ins which i...

Page 46: ...terruption Proposed IEC 801 4 Burst Showering Arcs All terminals on the 4910 4911 are protected against the application of external current sources provided that the current which flows into or out of the 4910 491 l s terminals is externally limited to 25 mA or less Each Hi terminal is clamped with respect to its Lo at 1 IV and IV but any signal whose slew rate exceeds lkV ps must not be applied A...

Page 47: ... 0 6 90 days 0 8 1 0 1 0 1 5 1 5 1 year 1 0 1 5 1 5 2 0 2 0 TC 0 C 50 C ppm C 0 05 0 05 0 06 0 10 0 12 0 03 0 10 0 10 OUTPUT RESISTANCE 1000 100Q ioopa 100Q ioon CURRENT DRIVE 15mA SETTING RESOLUTION ppm 0 1 0 2 0 2 Not applicable to 491 1 LINE REGULATION 0 01ppm for all power supply conditions OUTPUT SHORT CIRCUIT DURATION Indefinite 4 3 ...

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Page 49: ...ability Only modules which meet stringent TC noise level and stability requirements are subsequently built in to 4910 491 Is Complete units are then subjected to a 1 week bum in period and their stability is monitored for a minimum period of three months before shipment Units ordered with Option 10 Calibration andHot Shipment are traceably calibrated by Datron Instruments and are shipped in their ...

Page 50: ...for a period of 24 hours before the checks are carried out Equipment Requirements MODEL EQUIPMENT NUMBER REQUIRED 4910 Null Detector Sensitivity lp V Noise 200 nV pk pk Input Impedance 1M 1 For example Keithley 155 Calibrator Datron 4708 calibrator or similar 4911 Null Detector Sensitivity l iV Noise 200 nV pk pk Input Impedance 1MC2 For example Keithley 155 Interconnecting Leads In order to minim...

Page 51: ...ector range 2 Transfer the far end of the null detector s high lead to the terminal which the far end of its low lead is connected to see Fig 5 1 3 With the null detector set to measure zerothe null detector using its zoo control 4 Return the far end of the null detector s high lead to the terminal which it was previously connected to Connection for Null Detector Zeroing FIG 5 1 NULL DETECTOR ZERO...

Page 52: ...uard terminal to the Case terminal with the link provided 4 For the 4910 only connect the 4 Wire Output Buffer Hi terminal to the 1 terminal and the 4 Wire Output Buffer Lo terminal to the I terminal with the links provided 5 Connectthenulldetectortothe4910 4911 as shown in Fig 5 2 6 Use the null detector to measure the difference between the 4910 491 l s CELL output and its AVERAGEoutput Provided...

Page 53: ...ull detector to measure the difference between the 4910 s 4 WIRE OUTPUT BUFFER output and its AVERAGE output Provided that the difference is small enough it should be measured on the null detector s 10pV or lpV range with the null detector zeroed to better than 0 1pV Note the measured value on the 4910 4911 Calibration Confidence check Report Sheet J 5 ...

Page 54: ...d the 12 Use the calibrator s Error mode to deviate 4708 calibrator as shown in Fig 5 4 11 Set the output of the 4708 calibrator to 10 000000V on its 10V DC range and select remote guard and local sense its output until a null is achieved between the output of the calibrator and the AVERAGE output of the 4910 on the null detector s 10 iV range 5 6 ...

Page 55: ... 13 Connect the null detector to the 4910 and the and the 4708 calibrator output Providedthat 4708 calibrator as shown in Fig 5 5 the difference is small enough it should be 14 Set the output of the 4708 calibrator to measured on the null detector s IOjiV or lpV 1 000000V on its 10V range mfh mill detector K 5 to better than 0 1pV Note the measured value on the 15 Use the null detector to measure ...

Page 56: ...easured on the null detector s 10pV or lp V range with the null detector zeroed to better than 0 1p V Note the measured value on the 4910 4911 Calibration Confidence check Report Sheet 19 If the unit has just been received from Datron Instruments or a local sales office check the recorded figures against the validity tolerance figures as calculated on the 4910 4911 Calibration Confidence check Rep...

Page 57: ...ies are poor in which case it may be advantageous to operate both units from their internal batteries Because the IV and 1 018 V DIVIDED OUTPUTSare derived from the4910 491 1 s four individual CELL outputs it is essential that the CELL outputs are calibrated before the DIVIDED OUTPUTS as detailed in the calibration procedure given below IMPORTANT If the following calibration procedure is being per...

Page 58: ...nt an output the appropriate switch should be rotated in a clockwise direction In common with most decade switching when incrementing an output by one switch step it may be necessary to turn an individual rotary switch from its maximum setting to its minimum setting and to increase the next most significant rotary switch by one step Similarly when decrementing an output it maybenecessary to turn a...

Page 59: ...Section 5 Calibration 5 11 ...

Page 60: ...sfer the far end of the null detector s high lead to the terminal which the far end ofits low lead is connected to see Fig 5 8 requires the use of the null detector the detector 3 With the null detector set to measure zero the null detector using its zero control 4 Return the far endof the null detector s high lead to the terminal which it was previously connected to 5 12 ...

Page 61: ...rmal mode for a period of at least 4 hours To switch the unit from Transit mode to Normal mode refer to Section 3 of this handbook 3 Ensure that all four of the 4910 4911 s CELL outputs are coupled into the AVERAGE output i e that all four of the AverageLEDsare lit GREEN If any of the CELL outputs is not coupled into the AVERAGE output i e its Average LED is lit RED couple it to the AVERAGE output...

Page 62: ...r reading on the difference between the UUT s CELL output 491014911 Calibration Report Sheet and the certified 4910 491 l s AVERAGE 9 Repeat steps 5 to 8 for the CELL 2 output Provided that the difference is small CELL 3 and CELL 4 outputs of the UUT enough it should be measured on the null detector s 10pV or l xV range with the null detector zeroed to better than 0 1 iV Note the measured value on...

Page 63: ...rence between the UUT s AVERAGE output and the certified 4910 4911 AVERAGE output Provided that the Section 5 Calibration difference is small enough it should be measured on the null detector s lOjiV or lpV range with the null detector zeroed to better than 0 1pV Note the measured value on the 49 10 4911 Calibration Report Sheet 5 15 ...

Page 64: ...UUTand the IV DIVIDED OUTPUT of the certified 4910 Provided that the difference is small enough it should be measured on the null detector s lOpV or lpV range with the null detector zeroed to better than 0 1 pV Note the measured value on the 4910 4911 Calibration Report Sheet 14 Adjust the IV DIVIDED OUTPUT of the UUT to bring the null detector reading to zero 0 5 lV 15 Note the final null detecto...

Page 65: ...f the certified 4910 Provided thatthe difference is small enough it should be measured on the null detector s 10pV or l iV range with the null detector zeroed to better than 0 lM V Note the measured value on the 4910 4911 Calibration Report Sheet 18 Adjust the 1 018V DIVIDED OUTPUT of the UUTto bring the null detector reading to zero 05 lV 19 Note the final null detector reading on the 4910 4911 C...

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Page 67: ...APPENDIX C Battery Charging Voltage Limits 4910 4911 Users Handbook Appendix C Charging Voltage Volts 4910 11 Cl ...

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Page 69: ...ons must be taken to ensure that any common mode voltages generated by the external divider current total shown overleaf as Vc are eliminated from the measurement Providing the buffer output voltage is known it is measured in the Calibration Confidence check page 5 5 this can be done by taking two readings using aNull Detector Microvoltmeter and using the readings to calculate the Divided Output m...

Page 70: ...is assumed to be perfect In fact its uncertainty must be taken into account The voltage between 1 VHi and IVLo is to be found so IVLo potential is taken to be 0V 1 VHi 0V Vc 0 1 V Buf N1 but total common mode voltage Vc N2 so IVHi N2 N1 0 1 V Buf V Buf has been measured earlier N1 and N2 readings are taken as part of this measurement IVHi error N1 N2 491011 1 D2 ...

Page 71: ...t Mail Stop User Name Telephone Ext Serial number Datron Return Authorisation number Date of failure Brief description of fault Is the fault Permanent 1 Intermittent 1 1 if intermittent under what conditions does the fault re appear Is the instrument normally enclosed in a rack Yes 1 No 1 1 Approximate ambient temperature ...

Page 72: ... this insurance expense shall be paid oy the purchaser Where special domestic or export packing is specified a charge will be made to cover the extra expense involved 7 DAMAGE IN TRANSIT Claims tor damage In transit or loss in delivery of the goods will only be considered If the carriers and ourselves receive notice of such carnage wtthln seven 7 days of delivery or In the event of loss of goods i...

Page 73: ...67 AUSTRIA Walter Rekirsch Elektronisch Geraete GmbH Co Obachgasse 28 222 253626 134759 222 2572 75 A 1220 Wien BELGIUM Air Parts International B V Avenue Huart Hamoir 1 Box 34 2 241 6460 25146 API B 2 241 8130 1030 Bruxelles BRAZIL Comercial Goncalves Rua Deocleciana 77 Cep 01106 Ponte Pequena Sao Paulo SP CHINA Tianjin Zhong Huan Scientific Instruments Corp No 59 Zhao Jia Chang Street Tianjin Ho...

Page 74: ...Ashmoun St PO Box 2682 Horriya Heliopolis 2 661767 2 669861 23033 CHAKA UN 23315 EPIC UN 2 662839 2 668924 FINLAND Profeiec OY PO Box 67 00421 Helsinki 42 0 566 4477 125225 PROFESF 0 566 2998 FRANCE M B Electronique 606 Rue Foumy Zi de Buc 78530 Buc 1 39 568131 695414 1 39 565344 WEST GERMANY WAVETEK Electronics GmbH Freisinger Strafie 34 8045 Ismaning V 0 89 96 09 49 0 5 212 996 WVTK D 0 89 96 71...

Page 75: ... Sama Trading Corporation CPO Box 2447 Seoul 2 733 9336 K26375 SAMATR 2 733 8481 MALAYSIA TME Systems Pte Ltd 21 Moonstone Lane No 06 01 Singapore 1232 268 4608 786 37545 288 5935 MOROCCO MinhoISA 64 Rue El Mortada Casablanca 02 254945 24064 254969 NETHERLANDS Air Parts International BV PO Box 255 12 Kalkovenweg 2400 AG Alphen aan den Rijn 172043221 39564 1720 20651 NEW ZEALAND G T S Engineering L...

Page 76: ...Mahakali Caves Road Andheri East Post Box No 9447 22 6322412 Bombay 400 093 1179261 TIL IN 9122 634 2204 IRELAND Euro Electronic Systems Unit 3 Greenmount House Greenmount Office Park Harolds Cross Dublin BW 0001 535955 0001 534229 ISRAEL DAN EL Technologies Office 60 Pinkas St Tel Aviv 62151 3 453157 342105 3 459281 ITALY l Sistrel SPA Via Pellizza da Volpedo 59 20092 Cmisello Balsamo Milano 02 6...

Page 77: ...1 SINGAPORE Mecomb Singapore Ltd Sime Darby Centre 469 8833 RS 23178 895 Duneam Road 04 2 Singapore 2158 SOUTH AFRICA Altech Instruments Pty Ltd PO Box 39451 Wynberg 2018 11 887 7455 422033 SPAIN ESSA Equipos y Systemas SA C Apolonio Morales 13 B Madrid 16 1 458 0150 831 42856 SWEDEN i Ferner Electronics AB Snormakarvagen 35 Box 125 8 802540 10312 FERNER S S 16126 Stockhoim Bromma Telephone Telex ...

Page 78: ... 0603 404824 975173 0603 483670 UNITED STATES of AMERICA Datron Instruments Inc c o Wavetek RF Products Inc 5808 Churchman Bypass Indianapolis Indiana 46203 317 787 3915 TWX 810 341 3226 317 788 5999 Wavetek Northeast Area Sales 1 Executive Blvd Suite 206 SuffemNew York 10901 914 357 5544 914 357 5609 Wavetek Western Area Sales 9045 Balboa Avenue San Diego California 92123 V 619 565 9234 TWX 910 3...

Page 79: ...ble to model 491 1 Unit Under Test Serial Number Certified Unit Serial Number Null Detector Serial Number Null Detector Accuracy Checked by Company Department NUH Detector Reading Before DOT Aistmbnt ofNult Detector Reading Absolute Output Before Adjustment Uncertainty ofUUTOutput Before Adjustment Null Detector Reading After UUT Adjustment Uncertainty of Null Detector Reading Absolute Value of UU...

Page 80: ...Tolerance pV Utc Null Detector Measurement Tolerance pV Um Validity Tolerance pV Ud Utc Um Null Detector Measured Value pV 6a AVERAGE 10V to CELL 1 10V 10 1 23 T x 0 5 A E 6b AVERAGE 10V to CELL 2 10V 10 23 T x 0 5 B F 6c AVERAGE 10V to CELL 3 10V 10 1 23 T x 0 5 C G 6d AVERAGE 10V to CELL 4 10V 10 1 23 T X 0 5 D H Totals for four cells 4910 only Totals for four cells 491 1 only 7pV A B C D A B C ...

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