C.A 6250 - Chauvin Arnoux
Contents
1. eee rene eee eee eee eee eee eee 16 e eS Gal in EN e 16 4 5 COMPLIANCE WITH INTERNATIONAL GIANDARIUG AAA 16 ET TANG EASE E 16 enn Be 16 IIIT TE 17 WARRAN Y TT 19 T TOT aoe E cussed tse uddussecactecstaeeutenunenseecueusacue 20 1 PRESENTATION The C A 6250 microhmmeter is a top quality portable digital measuring instrument with backlit LCD display It is designed to measure very small resistances Housed in a rugged construction site type case with cover the 6250 is a self contained instrument powered by a rechargeable battery with built in charger It provides 7 measurement ranges from 5 mW to 2 500 W that can be accessed and selected directly on the front panel rotary switch It uses the 4 wire measurement method see 3 1 1 with automatic compensation of spurious voltages It has many advantages automatic detection of the presence of an external AC or DC voltage on the terminals before or during the measurement which disables or stops the measurements when measurement accuracy is no longer guaranteed 3 different measurement modes depending on the nature of the resistance to be measured protection of the operator when a resistance having a large inductive component motor transformer etc is measured After the measurement the instrument a2. P01101783 POOD ODG ceee EE a EE e a e A e eee Er P01102013 2 m cable to remote the Pt100 ee e P01102014 serial printer connecting cord EEN 01102903 1 set of 10 A Kelvin clamps With 3 cablesl 1101794 OO WSR CONO E 01295174 CONG 01295253 SN NII Batre E 01296030 xX 32 f s65 10 A2590 01297089 MES 2 EN 01297090 01298066 1 5232 9 25 2 COMMUNICATION Cor 01295172 DEUTSCHLAND Chauvin Arnoux GmbH OhmstraBe 1 77694 Rhein Tel 07851 99 26 0 Fax 07851 99 26 60 UNITED KINGDOM Chauvin Arnoux Ltd Unit 1 Nelson Ct Flagship Sq Shaw Cross Business Pk Dewsbury West Yorkshire WF12 7TH Tel 01924 460 494 Fax 01924 455 328 ITALIA Amra SpA Via Sant Ambrogio 23 25 20846 Macherio MB Tel 039 245 75 45 Fax 039 481 561 OSTERREICH Chauvin Arnoux Ges m b H Slamastrasse 29 2 4 1230 Wien Tel 01 61 61 9 61 0 Fax 01 61 61 9 61 61 SCANDINAVIA CA Matsystem AB Sjdflygvagen 35 SE 18304 TABY Tel 46 8 50 52 68 00 Fax 46 8 50 52 68 10 12 2014 Code 691106C02 Ed 1 SCHWEIZ Chauvin Arnoux AG Moosacherstrasse 15 8804 AU ZH Tel 044 727 75 55 Fax 044 727 7
3. 3 3 If desired press the ALARM 0 key to activate the alarm s Connect the measuring cords to the instrument then to the resistance to be measured 6 The instrument indicates ST BY standby Press START to start the measurement and if applicable STOP to stop it this depends on the measurement mode selected Remark Changing ranges during a measurement stops the measurement cycle the instrument returns to standby ST BY 7 The instrument displays the measurement result 8 Then press MEM to store the result and validate by pressing again For a detailed description of result storage see 3 5 oh 3 2 SELECTION OF THE MEASUREMENT MODE STYL AW KEY There are three measurement modes Inductive resistance measurement OM Non inductive resistance measurement WW Non inductive resistance measurement with automatic triggering AUTO The measurement mode is selected by successive presses on the M AW key the mode selected is displayed bellow the centre of the display unit 3 2 1 MEASUREMENT IN INDUCTIVE RESISTANCE MODE This mode is used for measurements on transformers motors and other inductive devices The measurement is started by pressing START and stopped by pressing STOP Description press the START key automatic check of connection of the current and voltage wires if the connection is incorrect an error message 15 displayed Err 11 if the current wires are
4. measuring current 1 A 250 gt 250 00 range measuring current 10 25 5mQ SET UP 2 2 KEYS 8 keys each havi 25 000 range measuring current 10 A 5 0000 mQ range measuring current 10 A instrument configuration 1 yellow START STOP key start stop measurement 8 elastomer keys each having a primary function and a secondary function 1 backlit LCD screen 1 receptacle for connection to line power to charge the battery 1 jack for connection of a Pt100 temperature probe 1 RS 232 serial INTERFACE plug 9 pin contacts for connection to a PC or to a printer ng a primary function and a secondary function Fad Activate the secondary function written in yellow italics bellow each key The 2nd symbol appears the screen Primary function before starting the measurement select the desired measurement mode inductive non inductive or non inductive with automatic triggering Secondary function select the metal for the temperature compensation calculation Cu Al or Other metal Primary function activate deactivate the temperature compensation function calculation of the resistance at a temperature other than the measurement temperature Secondary function activate deactivate alarms The direction and the triggering value high or low are adjusted in the SET UP menu Primary function store the measurement at an address identified by an object number OBJ and a test
5. Measurement of ambient temperature for compensation Resolution 0 1 C Accuracy 0 5 C 4 2 POWER SUPPLY The instrument is supplied by arechargeable battery pack comprising 5 1 2 V 8 5 Ah size D NiMH cells that can be charged using a built in charger by connecting the instrument to line power 90 to 264 V 45 to 420 Hz Note The battery compartment is inside the housing Charging the batteries Warning measurements are disabled while the batteries are charging if the instrument displays o during the measurement Ermi instand by A this means that the charge of the battery is low It must then be charges The instrument can be charged only when OFF and a full charge takes approximately 5h Indication of charge level when the rotary switch is set to a position other than OFF the display the instrument starts pre charging o bAt CHr9 and flashes Pappareil est en charge bAt FuLL and is displayed without flashing la charge est finie 4 3 ENVIRONMENTAL CONDITIONS Reference domain 23 C 5 C 45 C to 75 HR Nominal operating domain 0 C to 50 C 20 to 80 HR without condensation Extreme domain 10 C to 55 C 10 C to 80 C without condesation m Extreme storage and transport domain 40 C to 60 C 15 C to 50 C with battery charged 4 4 PHYSICAL CHARACTERISTICS Overall dimensions of the housing L x W x 270 x 250 x 180mm Mass ap
6. choose the data rate between the instrument and the peripheral This adjustment is made in SET UP 3 6 The baud rate can be set to 4 800 9 600 19 200 or 31 250 Data format 8 data bits no parity 1 stop bit hardware control CTS 3 USE PROCEDURE 3 1 MAKING A MEASUREMENT 3 1 1 CONNECTIONS Connections are made in accordance with the 4 wire measurement principale the set up used is shown in the figure bellow Where Ri Internal resistance of the instrument Rf Resistance of the measuring wires Rc Contact resistance Rx Resistance to be measured From a DC voltage U a generator delivers a current A voltmeter measures the voltage drop Ux on the terminals of the resistance Rx to be measured and displays Rx The result is independent of the other resistances in the current loop Ri Rf Rc provided that the total voltage drop they cause in combination with Rx is less than the voltage the source can deliver U U lt 6V 3 1 2 SEQUENCE OF USE 1 Turn the rotary switch from OFF to the desired range The range and the associated measuring current are then indicated at bottom left in the display unit 2 Press the NML WX key until the desired measurement mode is obtained For a detailed description of the different measurement modes see 3 2 3 If desired press the 0 key to activate the temperature compensation function For a detailed description of this function see
7. earth in category Ill Failure to observe the safety instructions may result in electric shock fire explosion and destruction of the instrument and of the installations The operator and or the responsible authority must carefully read and clearly understand the various precautions to be taken in use Sound knowledge and a keen awareness of electrical hazards are essential when using this instrument If you use this instrument other than as specified the protection it provides may be compromised thereby endangering you Before making any measurement check that the resistance to be checked is not live never connect the instrument to a live circuit Do not use the instrument if it seems to be damaged incomplete or poorly closed Use only the accessories supplied with the instrument compliant with safety standards Before each use check the condition of the insulation on the leads housing and accessories Any item of which the insulation is deteriorated even partially must be set aside for repair or scrapping When resistances having a large inductive component motors transformers etc are measured the instrument automatically discharges the inductance after the measurement During this discharging the symbol is displayed Do not disconnect the measuring cords until the symbol A disappears Comply with the charging characteristics of the battery and use a fuse of the appropriate type and rating failure to do so may damage
8. incorrectly connected Err 12 if the voltage wires are incorrectly connected the instrument switches to standby the cycle is resumed when the connection is correct current not established measurement of residual voltage Uo on the terminals of the resistance If this voltage is too high the instrument displays Err 13 establishment of current I maintained for as long as the instrument does not return to standby measurement of voltage U1 on the terminals of the resistance and display of the measurement U1 Uo any subsequent measurement involves the measurement of Un only since Uo is kept in memory the cycle is ended by pressing the STOP key Operating diagram 640ms 120 5 1200ms C check of connections O measurement of residual voltage stored 1 2 3 successive measurements of the voltage on the terminals of the resistance interval between two measurements 120 ms The delay stated for the first measurement 1 200 ms is an indication only it can vary according to the load measured Remarks Ifthe range is exceeded the instrument displays Err 07 The source of current is protected against overheating If a measurement at 10 A lasts too long gt several tens of seconds and causes a temperature rise the current is cut off and the instrument displays Err 05 The instrument must be allowed to cool down before another measurement can be made m After a measurement c
9. indicates the battery charge condition indicates that temperature compensation is activated indicates the metal selected for the temperature compensation function indicates that data are being transmitted to the serial interface Indicates the memory use level PRINT printing of current measurement PRINT MEM printing of stored data MEM storage of measurement MR retrieval and reading of a stored measurement REMOTE instrument remotely controlled via the RS 232 interface measurement units of the result displayed indicates the status of the instrument OPER measurement in progress ST BY Standby no measurement in progress waiting for an action indicates the measurement mode selected indicates the range and measuring current selected Warning Do not disconnect the measuring wires presence of external voltage indicates which alarm s are activated and their direction 2 4 RS 232 INTERFACE CHARACTERISTICS The RS 232 jack can be used with 4 different peripherals choice of 4 different links in SET UP PC activate RS232 link between the instrument and a computer activate RS232 link between the instrument and a printer TRIG activate the remote measurement triggering function VT100 activate RS232 link between the instrument and a disply console Note that the RS232 can be switched OFF to deactivate the input and output functions of the connector Saves battery power Selecting an RS232 link opens a submenu in which to
10. number TEST Secondary function retrieve stored data this function is independent of the setting of the switch except in the OFF and SET UP settings Primary function in SET UP mode select a function or increment a flashing parameter Secondary function in SET UP mode select a function or decrement a flashing parameter Primary function select the parameter to be modified in wraparound mode from left to right In SET UP mode access the adjustments of a function Secondary function in SET UP mode shift the decimal point and select the unit Primary function print the measurement directly to a serial printer Secondary function print stored data to a serial printer Primary function activate deactivate the backlighting of the display unit Secondary function activate and adjust the sound level deactivate the audible signal 2 3 DISPLAY UNIT Dual liquid crystal display 5888 TEST Secondary display unit measurement parameters memory address D D UD Da LU UU Ufro Main display unit measured values Other indications and symbols 1 2 4 J ot PIOA E E 10 11 12 Indicates that the secondary function of a key will be used 14 en BI Other metal Lei ALARM 1 H HI PRINT MEM 6 14 ALARM 2 F REMOTE MR OBJ TEST 7 e HHH Ha 2500 100mA SYY WW ST BY OPER 11 10 d indicates that the buzzer audible signal is activated
11. of the room 23 C 5 C Relative humidity 45 to 75 The standards that make up the checking chain must be such that the errors at the testing points are known and are lt 0 01 for the resistance standards with allowance for the factors of influence encountered If this check shows that one or more characteristics of the instrument are outside the specified tolerances you must either return the instrument for verification and adjustment in mainland France to our COFRAC accredited metrology laboratories or to a Manumesure agency Information and coordinates on request t l 02 31 64 51 43 outside mainland France a Chauvin Arnoux subsidiary to the dealer who sold you this equipment or make the adjustment using the procedure below which requires equipment at least as effective as that used for the check performed previously Adjustment procedure RECOMMENDATIONS The instrument was adjusted in the factory Any untimely work irreversibly alters the adjustments of the instrument The person responsible for the use of this instrument must make sure that the person in charge of the work has been informed of the precautions to be taken in performing this operation For the adjustment to be performed under ideal conditions Chauvin Arnoux recommends returning the instrument to its workshops Failure to comply with these recommendations may void the warranty This operation must be performed under the foll
12. on the terminals of the resistance establishment of measuring current I measurement of the voltage U1 on the terminals of the resistance and display of the measurement R U1 U0 I to make another measurement it is necessary to release at least one link then reestablish it cycle ended by pressing the STOP key Remarks Ifthe range is exceeded the instrument displays Err 07 3 3 TEMPERATURE COMPENSATION 0 3 3 1 PRINCIPLE The metals used for the windings of certain components e g the copper in transformers and motors have large temperature coefficients of the order of 0 4 C for copper and aluminium This makes resistance measurements strongly dependent on the temperature of the component The temperature compensation function is used to adjust the resistance measured which depends on the ambient temperature measured or programmed to the value it would have at a programmed reference temperature The temperature compensated resistance is calculated as follows R t ref R t amb 1 alpha t ref 1 alpha where R t amb resistance measured at ambient temperature by the instrument t amb temperature measured by a PT100 or programmed by the user Alpha temperature coefficient of the selected metal Aluminium Copper or Other metal t ref programmed reference temperature to which the measurement is referred t amb alpha and t ref are parameters that can be pro
13. selection Other metal ALPH dE9 10th press temperature unit dE9 2 ALAr alarms values and aun eos directions LISH 12th press duration of backlighting nEn 13th press erasure of memory Remark The SEt function can also be adjusted This possibility is however provided for maintenance of the instrument only and is password protected see Maintenance Prnt OFF 119 PC ut100 type of communication successive presses on rate speed regulation then lt Low hight or OFF Fr 9b 10 55 C press on E to change the digit press on to change the value of the digit Prb or nPrb presence or absence of sensor press on if nPrb 10 55 C if nPrb then press on to change the digit press to change the value of the digit Cu or Al or Other metal successive presses on gt 0 1 press on to change the value of the digit 00 9 C or dEQF press on 4 ALARM 1 2 lt choice of parameter to change successive presses on gt to 2500Q modification of the parameter lt 1 mn 6 10 mn or OFF dEL or dEL O press on then all memory or object 00 10 3 C press on E to change the digit F 3 6 2 ERASING THE MEMORY Two possibilities erase all stored data erase the content of an OBJET number Erasing all stored data in the SET UP menu select the nEn parameter press t
14. the instrument and void the warranty Set the switch to OFF when the instrument is not in use Check that none of the terminals is connected and that the switch is set to OFF before opening the instrument All troubleshooting and metrological checks must be performed by competent and accredited personnel CONTENTS le PRESEN TATION 4 2 DESCRIPTION E 5 SE EE Eege Ee 5 ee 5 2 WE 6 2 4 RS 232 INTERFACE CHARACTERIGTICOD aa 7 Se USE PROCEED UR Eege 7 SE le ET NEES 7 3 2 SELECTION OF THE MEASUREMENT MODE M IA ei E 8 ah AG IVATING THE ALARMO E 10 3 5 STORING AND RETRIEVING MEASUREMENTS MEM 11 3 6 INSTRUMENT CONFIGURATION niaaa eiai ea 12 3 7 PRINTING RESULTS PRINT PRINT REENEN 13 3 0 IST OF CODED ERRORS eebe EES eege 14 4 GHARAC TERISTICS eege 15 ATE RARA G TERE TIG ernea A E ee ee ee 15 A POWER URP GE 15 4 3 ENVIRONMENTAL
15. 5 56 Leger HL EGER 381 353 Tel 86 21 65 21 51 96 Fax 86 21 65 21 61 07 ESPANA Chauvin Arnoux Ib rica S A C Roger de Flor 293 1a Planta 08025 Barcelona Tel 90 220 22 26 Fax 93 459 14 43 MIDDLE EAST Chauvin Arnoux Middle East P O BOX 60 154 1241 2020 JAL EL DIB Beirut LEBANON Tel 01 890 425 Fax 01 890 424 USA Chauvin Arnoux Inc d b a AEMC Instruments 200 Foxborough Blvd Foxborough MA 02035 Tel 508 698 2115 Fax 508 698 2118 http www chauvin arnoux com 190 rue Championnet 75876 PARIS Cedex 18 FRANCE Tel 33 1 44 85 44 85 Fax 33 1 46 27 73 89 info chauvin arnoux fr Export T l 33 1 44 85 44 38 Fax 33 1 46 27 95 59 export chauvin arnoux fr
16. AND RETRIEVING MEASUREMENTS MEM MR 3 5 1 STORING RESULTS MEM Measurement results can be stored at memory addresses identified by an object number OBJ and a test number TEST An object is a box in which 99 tests can be stored An object can thus represent a device on which a number of measurements tests are to be performed Procedure 1 When the measurement is over result held on the display unit press the MEM key The MEM symbol flashes and the small display unit indicates the first free OBJ TEST number e g 02 01 The main display unit then indicates FrEE The OBJ no is that of the last measurement stored but the TEST no is incremented by 1 OBJ TEST can changed at any time using the and keys If the user selects a memory address that is already occupied OCC appears the main display unit If anew OBJ is selected TEST is set to 01 2 Pressing the MEM key again saves the measurement results at the selected memory address whether occupied or not The MEM symbol stops flashing and remains displayed Pressing a key other than MEM or turning the switch before the second press on MEM causes an exit from the save mode without storage of the results 3 To exit from the memory mode and return to measurement mode turn the rotary switch Remark Memory available This function is activated automatically when a result is saved Press MEM once to obtain the next free OBJ TEST number The memory use s
17. C A 6250 MICROHMMETER CHAUVIN G ARNOUX User s manual CHAUVIN ARNOUX GROUP Thank you for purchasing a C A 6250 microhmmeter To obtain the best service from your instrument read this user manual carefully comply with the precautions for use WARNING risk of DANGER The operator must refer to this user s manual whenever this danger symbol appears Equipment protected by double insulation Earth The CE marking indicates conformity with European directives in particular LVD and EMC The rubbish bin with a line through it indicates that in the European Union the product must undergo selective disposal in compliance with Directive WEEE 2002 96 EC This equipment must not be treated as household waste Definition of measurement categories Measurement category IV corresponds to measurements taken at the source of low voltage installations Example power feeders counters and protection devices Measurement category Ill corresponds to measurements on building installations Example distribution panel circuit breakers machines or fixed industrial devices Measurement category Il corresponds to measurements taken on circuits directly connected to low voltage installations Example power supply to electro domestic devices and portable to PRECAUTIONS FOR USE This device is compliant with safety standard IEC 61010 2 030 and the leads are compliant with IEC 61010 031 for voltages up to 50 V with respect to
18. ble the instrument perform the above operations in reverse order Important remarks Changing the battery causes stored data to be lost Avoid storing the instrument with the battery charge too low If the instrument is left unused for a long time more than 2 months the charging time will be longer Before using the instrument again it is therefore best to carry out 3 complete charging discharging cycles 5 1 2 REPLACING FUSES The instrument is protected by two fuses quick blow fuse F1 6 3 x 32 mm 16 A 250 V with a low internal resistance protects the current source against the application of an external voltage quick blow fuse 5 0 x 20 mm 2 A 250 V protects the power supply board of the charger The replacement procedure is as follows disassemble the instrument as indicated in 5 1 1 remove the defective fuse replace it with an identical fuse In all cases if the problem persists you must send the instrument back to Manumesure for checking 5 1 3 CLEANING The instrument must be disconnected from any source of electricity Use a soft cloth slightly moistened with soapy water Rinse with a damp cloth and dry rapidly with a dry cloth or forced air Do not use alcohol solvents or hydrocarbons 5 2 MAINTENANCE The primary function of the programming menu is reserved for maintenance use and is protected by a 5 digit password set the rotary switch to SET UP SEt is then displayed enter the pro
19. e to be adjusted and check that the standard is in fact connected select AdJH and enter the value of the standard select MEASH the adjustment is then performed the AdJ message indicates that the adjustment is over and was successful Adjustment of the Pt100 measurement inthe Set maintenance menu choose the AdJ command inthe submenu choose the Pt100 range and check that the standard is in fact connected select AdJ L and enter the value of the standard select MEAS L the low point is then adjusted select AdJ H and enter the value of the standard select MEAS H the high point is then adjusted the AdJ message indicates that the adjusment is over and was successful Note the error messages Err10 Err21 or Err22 may be displayed 5 2 2 UPDATING THE INTERNAL SOFTWARE If there are upgrades of the instrument the updates of the internal software will be available on Chauvin Arnoux s Web site http www chauvin arnoux com with the procedure to be followed The update will be performed using the UP9 command of the SEt maintenance menu Once this command has been validated 5 lines appear indicating that the instrument is ready to communicate with the computer for the downloading of the new version of the program Then observe all indications and recommendations displayed on your computer Once the update is over the instrument reboots as during a normal start up Important the transmission rate for t
20. ements cycles C check of connections 0 measurement of the residual voltage M measurement of the voltage on the terminals of the resistance Remarks Ifthe range is exceeded the instrument displays Err 07 m This mode has many advantages it reduces the consumption because the current is cut off between measurements and so increases the battery life it avoids a temperature rise in the resistance measured the compensation of spurious electromotive forces because they are measured and compensated before each resistance measurement 3 2 3 MEASUREMENT IN NON INDUCTIVE RESISTANCE MODE WITH AUTOMATIC TRIGGERING This mode is intended only for measuring resistances without time constants In this measurement mode there is no need to press START other than to start the whole measurement process or STOP to start or stop the measurement The measurement is triggered automatically as soon as the current and voltage circuits are established as soon as contact is established and stops automatically as soon as the measurement result is available Another measurement is started automatically as soon as the current and voltage circuits are established again as soon as contact is established again etc Description press the START key to activate the cycle connect the wires to the resistance The instrument remains on standby until the links are established measurement of residual voltage Uo
21. erature sensor incorrectly connected or missing Err 11 wires incorrectly connected Err 12 Voltage circuit wires incorrectly connected or measured resistance too high Err 13 Residual voltage too high Err21 Adjustment out of bounds Err 22 Measured value out of bounds Err 23 Edition out of bounds Err 24 Cannot write to back up memory Err25 Cannot read in back up memory Err 26 Memory full Err27 Memory empty no data available Err 28 Memory check problem Err 29 Object or test number incorrect Warning If error message 2 3 4 or 8 appears the instrument must be switched off and sent to qualified organization for repair 4 CHARACTERISTICS 4 1 CHARACTERISTICS Remark accuracies are stated in the form n read C where read reading and C a Constant in practical units They apply to the instrument placed in the reference conditions see 4 3 after 1 hour of warming up 4 wire measurement with compensation of spurious voltages measurements made under reference conditions as per publication 485 national standards NF 42 630 and DIN 43751 0 05 250 00m2 10 0 05 Possible overshoot of nominal range 5mQ range 20 25mQ range 20 the values depend on the battery charge condition Maximum open circuit voltage on terminals 7V Temperature coefficient from 0 to 18 C and from 28 C to 50 C lt 1 10 of the accuracy per
22. grammed in SET UP see 3 6 Various values of temperature coefficient carson 0 1850 G 1000026 ee Jg _ E _ 3 3 2 PROCEDURE first check the programming of the t amb alpha and t ref parameters see 3 6 the connections press the R key the symbol and the metal selected are displayed steadily on the display unit the small display unit indicates the temperature then the temperature t amb once the measurement has been made the instrument displays onthe small display unit depending on the programming the programming ambiente temperature or the temperature measured by the temperature sensor or if the temperature sensor is validated but not connected or incorrectly connected or if the temperature measured is out of bounds 10 C to 55 C on the large display unit the compensated resistance value Remark m Err 10 is displayed if a temperature is out of bounds or if the leads of the sensor become disconnected 3 4 ACTIVATING THE ALARMS The alarms are activated by successive presses on the MR key 2nd The instrument displays alarm 1 and its direction of activation then alarm 2 and its direction of activation then alarm 1 and alarm 2 and their directions of activation The values of the alarms and their direction of activation are programmed in advance by the user in SET UP see 3 6 3 5 STORING
23. gramming mode by pressing the key enter the password the factiry value is 09456 When the password has been validated a submenu proposes the various maintenance functions the 4 key is then used to navigate in the functions menu the desired function command is selected by pressing the key L CPLA Display the values of adjustments counters for the various ranges 1st press Pt100 25000 2500 250 2500 250mQ 25mQ Em L i 2nd press Adjust the instrument refer to 5 2 1 Delate the adjustment coefficients and use the default coefficients press Restarting the instrument cancels the previous action 4th press UP9 Update the program of the instrument refer to 5 2 2 D 5th press Select the line power frequency 50 or 60 Hertz 5 2 1 METROLOGICAL CHECK Like all measuring or testing devices the instrument must be checked regularly This instrument should be checked at least once a year For checking and calibration contact one of our accredited metrology laboratories information and contact details avilable on request at our Chauvin Arnoux subsidiary or the branch in your country As part of the tracking of metrological quality the user may be led to perform periodic performance checks him herself The checks must include the usual metrological precautions Comply with the following instructions The operations are performed in the reference conditions i e Temperature
24. he key on the main display unit select CLr using the key confirm by pressing key the instrument asks you to confirm by CLr Y to execute this function if yes press the key if no select CLr n by pressing the key and confirm by pressing the key Erasing the content of an OBJET number in the SET UP menu select the nEn parameter press the key on the main display unit select CLr 0 using the key confim by pressing the key the last OBJ number flashes it be changed using Y keys confirm by pressing the key the instrument asks you to confirm by CLr Y to execute this function if yes press the key if no select CLr n by pressing the key and confirm by pressing the key 3 7 PRINTING RESULTS PRINT PRINT MEM Two printing modes are available immediate printing of a measurement PRINT printing of stored data PRINT MEM If transmission of the data to the printer goes well the COM symbol flashes on the display unit problem occurs the symbol COM remains on steadily on the LCD screen 3 7 1 IMMEDIATE PRINTING OF A MEASUREMENT PRINT Following a measurement or after the MR memory retrieval mode is accessed the PRINT function can be used to print the measurement results When the key is activated the measurement is printed along with the measurement conditions and HiO if the function was activated To stop printing change the set
25. his update is 19 200 bauds ifthe update is interrupted before it is complete it is impossible to restart the instrument Downloading must be resumed after setting the instrument back to awaiting transfer 5 2 3 REPAIR For all repairs before or after expiry of warranty please return the device to your distributor 6 WARRANTY Except as otherwise stated our warranty is valid for twelve months starting from the date on which the equipment was sold Extract from our General Conditions of Sale provided on request The warranty does not apply in the following cases Inappropriate use of the equipment or use with incompatible equipment Modifications made to the equipment without the explicit permission of the manufacturer s technical staff Work done on the device by a person not approved by the manufacturer Adaptation to a particular application not anticipated in the definition of the equipment or not indicated in the user s manual Damage caused by shocks falls or floods 7 TO ORDER GO NEE P01143201 Delivered with a bag containing 1 set of 3m cables terminated by Kelvin clamps 12 Euro power supply cord 1 user manual in 5 languages 5 abridged user manuals 1 per language 1 Data export software MOT Micro Ohmmeter Transfert on a CD ROM 1 RS232 communication cord Accessories 1 set of 3 m cables with double contact PINS EE P01102056 1 set of 3 m cables with mini Kelvin Campe
26. ments with an alarm active 3 6 INSTRUMENT CONFIGURATION SET UP This function is used to configure the instrument and change its configuration as needed After the rotary switch is turned to SET UP all segments of the display unit light for 1 second SEt then appears on the small display unit to prompt for a key press the 7 key is then used to navigate in the parameter programming menu the parameter to be modified is selected by pressing the key After a parameter to be modified has been selected the figures or symbols corresponding to the parameter appear on the screen the figures or symbols that can be modified flash changes are made using the Y key to change the value of a figure digit or symbol and the key to change figures digits or symbols Remarks all changes to parameters are saved immediately and permanently to exit from the configuration mode turn the rotary switch to a position other than SET UP 3 6 1 PROGRAMMING MENU The table bellow specifies which keys are active in the SET UP function and the corresponding display with the possible adjustment ranges Display Parameter to modified key RS 1st press communication BUZZ 2nd press buzzer sound level a EdSn e trEF 6th press reference temp tAnb 7th press CS gt EdPP a Lan9 5th press printing language nEtA Value EtA Cu or Al or 8th press metal
27. owing stable climatic conditions Temperature 23 C 5 Humidity 45 to 75 90 Warm up time 1 hour The temperature of the instrument must be stabilized as well as the temperatures of the standards If these conditions cannot be met returning the instrument to the factory is preferable To adjust the instrument it is necessary to have resistances calibrated with an uncertainty less than or equal to 1x104 The standards must be able to withstand the currents of the corresponding ranges The following ranges must be adjusted Pt100 5 mQ 25 mQ 250 2500 25 250 2500 The measurement ranges are adjusted at one point We recommend standards having values greater than 80 of full scale of the ranges The Pt100 range is not a measurement range it is used for temperature compensation measurements it must therefore also be adjusted at two points a low point and a high point We recommend using standards close to 100 Q for the low point and 115 Q for the high point the lower and upper limits being 98 and 120 Q For the adjustments of the ranges connect the standards using the measurement connectors For the adjustment of the Pt100 range connect the standards to the connector of the probe Reminder The maintenance menu is password protected Adjusting the 5 25 mQ 250 mQ 2500 25 250 and 2500 Q ranges inthe SEt maintenance menu select the command select the rang
28. proximately 4kg 4 5 COMPLIANCE WITH INTERNATIONAL STANDARDS Electric safety as per standard EN 61010 1 Level of pollution 2 Measurement category II Max voltage relative to earth 50 V CEM conformity as per standard EN 61326 1 standard environment discontinuous operation Mechanical protections Tightness as per standard EN 60529 IP53 housing open IP64 housing closed Protections Electronic protection up to 250 V on the voltage wires Protection by fuse on the current wires Protection against opening of the current circuit during inductive resistance measurements 5 MAINTENANCE Except for fuse the instrument contains parts that can be replaced by personnel who have not been specially trained and accredited Any unauthorized repair or replacement of a part by an equivalent may gravely impair safety 5 1 SERVICING 5 1 1 CHANGING THE BATTERY PACK The battery should preferably be changed by Manumesure or by a repairer approved by Chauvin Arnoux However the replacement procedure is as follows disassemble the instrument unscrew the 4 screws on the bottom withdraw the instrument from the box turn the instrument over so that the battery pack is up unscrew the nuts at the four corners of the mettallic plate remove the 6 and5 contact connectors of the power supply board and the wires of the pack The yellow wires have no polarity change the battery pack to reassem
29. ting of the rotary switch Below is a printing ticket form CHAUVIN ARNOUX C A 6250 INSTRUMENT NUMBER LOW RESISTANCE MEASUREMENT OBJECT DESCRIPTION MEASUREMENT NON INDUCTIVE METAL Cu METAL COEFF 3 93 MEASUREMENT TEMPERATURE 23 2Cel REFERENCE TEMPERATURE 20 0Cel RESISTANCE MEASUREMENT 1294 60hm MEASUREMENT REFERED TREF 1287 20 REMARK EEN DATE OF NEXT TEST 3 7 2 PRINTING STORED RESULTS PRINT MEM This function is used to print the content of the instrument s memory Press the PRINT MEM key 2 PRINT The secondary display unit indicates the OBJ TEST number 01 01 as start address for printing The main display unit indicates the last recording in memory e g 12 06 as end address for printing To change the printing beginning end addresses use the normal modification procedure and Y keys To exit without printing change the setting of the rotary switch To start printing press the PRINT key again To stop printing change the setting of the rotary switch 3 8 LIST OF CODED ERRORS Err 1 Battery charge too low Err 2 Internal problem Err Impossible to measure battery charge Err 4 Impossible to measure temperature Err 5 Internal temperature too high Let the instrument cool down Err 6 Measuring current not established Err 7 Measurement out of range Err 8 Internal problem Err 9 Measurement cycle stopped Err10 Temp
30. utomatically discharges the inductance if the measuring cords are left connected to the inductive resistance measured programming of alarm thresholds alarms in the form of audible beeps possibility of measuring the measurement temperature using a Pt100 jack on the front panel function for automatic calculation of the resistance at a reference temperature using the possibility of selecting the type of metal the resistance is made of and its temperature coefficient extended memory making it possible to store approximately 1 500 measurements indication of the level of memory use indication of battery charge condition automatic switching of the backlighting to standby to save battery power RS 232 interface to print the results on a serial printer or export them to a PC main applications are bonding measurements earth continuity measurements motor and transformer resistance measurements contact resistance measurements component measurements electric cable resistance measurements tests of mechanical links 2 1 FRONT 4 4 s 2 DESCRIPTION 6250 afety terminals identified C1 P1 P2 and C2 9 way rotary switch Off 2500 Q 2509 250 instrument power off setting for charging 2500 0 range measuring current 1 mA 250 00 range measuring current 10 mA 25 000 range measuring current 100 mA 2500 2500 0 range
31. ycle the instrument automatically discharges the inductance completely During this discharging the instrument displays the following icon Never touch or disconnect leads before icon disappears 3 2 2 MEASUREMENT IN NON INDUCTIVE RESISTANCE MODE This mode is used to measure contact resistances bondings and generally any resistance having a time constant shorter than a few milliseconds The measurement is started by pressing START and stops automatically as soon as the measurement result is available START must be pressed again to make another measurement Description press the START key automatic check of connection of the current and voltage wires if the connection is incorrect an error message 15 displayed Err 11 if the current wires are incorrectly connected Err 12 if the voltage wires are incorrectly connected the instrument switches to standby the cycle is resumed when the connection is correct current not established measurement of residual voltage Uo on the terminals of the resistance If this voltage is too high the instrument displays Err 13 establishment of current measurement of the voltage on the terminals of the resistance U1 then cutoff of the current display of the measurement R U1 Uo 1 automatic stop at the end of the measurement The instrument in standby is ready for another measurement Operating diagram Example two measur
32. ymbol is displayed Symbol identified as no 6 on the display unit segments lit the entire memory is free segments are off the entire memory is full One segment represents approximately 300 records 3 5 2 RETRIEVING STORED RESULTS MR The MR function can be used to retrieve any stored data whatever range is selected on the rotary switch Procedure 1 Press the MR key Ga MEM The MR symbol is then displayed steadily on the display unit The small display unit indicates the last occupied OBJ TEST number e g 02 11 OBJ TEST be changed at any time using the and 7 keys 2 To exit from the memory mode after the consultation press MR again or turn the rotary switch The content of a memory location is as follows the OBJ TEST no of the measurement the range and measuring current settings the measured value with any compensation the 0 symbol and symbol of the metal if the measurement was compensated the active alarms at the time of the measurement Other items of information are also accessible by pressing a key displays the coeff of correction of the metal selected for compensated measurements 0 displays the ambient temperature at the time of the measurement for compensated measurements 0 2fois displays the reference temperature of the measurement for compensated measurements ALARM displays the alarm threshold for measure
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