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MICRO-OHMMETER E N G L I S H User Manual

1. ule NOTE The PDF XChange option must be selected to be able to generate PDF reports from within DataView Micro Ohmmeter Model 6250 47 Dataview insat rins Wizard mti Figure 6 2 12 In the Ready to Install the Program window click on Install 13 If the instrument selected for installation requires the use of a USB port a warning box will appear similar to Figure 6 3 Click OK Deae rata Med Do sot connect the AIMC JSD ivetrerrent or cale uti ater the imei eilatenn r We dicens end the Dated cere far hen Feed B the AEMC USB Ietrumeet ce cadie i Connected to Me cormputer non thea daconnect e trom the computer before proceeding Figure 6 3 i NOTE The installation of the drivers may take a few moments Windows may even indicate that it is not responding however it is running Please wait for it to finish 14 When the drivers are finished installing the Installation Successful dialog box will appear Click on OK 15 Next the Installation Wizard Complete window will appear Click on Finish 16 A Question dialog box appears next Click Yes to read the procedure for connecting the instrument to the USB port on the computer 48 Micro Ohmmeter Model 6250 NOTE The Set up window remains open You may now select another option to download e g Adobe Reader or close the window 17 Restart your computer then connect the instrument to the USB port
2. From the Stand by state start a test by performing the following Press the Mw button until the AUTO icon shows on the display Press the START STOP button Connect the probes to the specimen The unit waits until it detects that the current and voltage leads are connected correctly 34 Micro Ohmmeter Model 6250 Residual voltage Vo measurement across the resistor terminals is measured The measurement current I is established the voltage across the resistor terminals V4 is measured and the measurement resistance result R V4 Vo l is displayed To start a new measurement cycle Release at least one probe and then reconnect it to the next point or specimen i NOTE If the range is exceeded the unit displays Err 07 Changing the range switch position will stop the test cycle and the unit returns to the Stand by state Each measurement taken during the test cycle can be temperature compensated and stored while the test cycle is running Store the measurement of each specimen or point by first pressing the MEM button then select the object and test location to store the measurement using the arrow buttons When the desired loca tion has been selected press the MEM button a second time to complete the data storage process The test is stopped by pressing the START STOP button 4 6 Ambient Temperature Compensation Principle The metals used in the windings of certain devices for
3. One numeric field contains 4 digits for displaying ambient and reference temperature levels on the top line in temperature compensation mode The other contains 5 digits and is used to display the measured values on the bottom line Error messages are also listed on the bottom line Micro Ohmmeter Model 6250 15 3 4 Environmental Operating Temperature 14 to 132 F 10 to 55 C 10 to 80 non condensing Storage Temperature 40 to 140 F 40 to 60 C 3 5 Safety CE Ol EN 61010 1 50V CAT III Pollution Degree 2 Conducted and radiated emission EN 55022 class B EN 61000 3 2 EN 61000 3 3 Immunity EN 61000 4 2 electrostatic discharges EN 61000 4 3 radiated fields EN 61000 4 5 shock EN 61000 4 6 conducted disturbances EN 61000 4 11 voltage drops EN 61000 4 4 bursts Specifications are subject to change without notice 16 Micro Ohmmeter Model 6250 CHAPTER 4 OPERATION i NOTE Charge the instrument fully before use 4 1 Quick Summary The following is a summary instruction set that will assist the operator in performing measurements For complete details on each function and test method refer to the operating procedure section amp 4 3 and instrument configuration section 4 2 in this manual WARNING Read and follow all safety warnings on page 4 before operat ing this instrument 1 Turn the instrument on and select a test range by turning the rotary switch to the desi
4. h Model 8208 Power Clave Model 97 and E07 Sertrel Data Legge Sumcle Logger N OTR Model 510 Figure 6 1 46 Micro Ohmmeter Model 6250 There are several different options to choose from Some options require an internet connection 10 11 e DataView Version x xx xxxx Installs DataView onto the PC Adobe Reader Links to the Adobe website to download the most recent version of Adobe Reader to the computer Adobe Reader is required for viewing PDF documents supplied with DataView e DataView Updates Links to the online DataView software updates to check for new software version releases Firmware Upgrades Links to the online firmware updates to check for new firmware version releases e Documents Shows a list of instrument related documents that you can view Adobe Reader is required for viewing PDF documents supplied with DataView DataView Version x xx xxxx option should be selected by default Select the desired language and then click on Install The Installation Wizard window will appear Click Next To proceed accept the terms of the license agreement and click Next In the Customer Information window enter a Name and Company then click Next In the Setup Type window that appears select the Complete radio button option then click Next In the Select Features window that appears select the instrument s control panel that you want to install then click Next
5. seeeeseess 6 1 2 Definition of Measurement Categories sesssss 6 1 3 Receiving Your Shipment sssssseeeee 6 1 4 Ordering Information sse enn 7 1 4 1 Accessories and Replacement Parts 7 PRODUCT FEATURES 1eeeeeeeeeee ense eene nnne nnne 8 2 1 Descriptionz o hee t ede eroe era 8 2 2 ADplicatlons RERBA MEER 9 2 3 Key Eealtures e e cette etn ree desee edet ARRA 9 2 4 Gontrol Features settle te ce leue Pa eit nd 10 2 5 Button FUNCIONS sieran eiaei endini 11 2 6 Display Symbols iiaa e aA 12 SPECIFICATIONS sssssssunnnnnnnnnnnnnnnunnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nnn 14 331 EECCA aaa E R E 14 3 2 Mechanical a oaia toe ertet R r aa etie a 15 23 DISplay iui e a E AE 15 3 4 Environmental eiaa eiie ieina ii a airiai 16 EKE i AE irte E E E T bof udo mM noe 16 OPERATION 1eeeeeeeeee eene enrnn enenatis 17 4 1 Q ick Sumrnaty ice er EP Re RE RR Aha ERE 17 4 2 Instrument Configuration SET UP Mode 19 4 2 1 Program Menu Tree ccccceesccceeesesccceesseneeceeestecee 19 4 2 2 Programming the 9 Pin Interface Port rS 20 4 2 3 Setting the Buzzer Level bUZZ 21 4 2 4 Reading the Internal Serial Number EdSn 21 4 2 5 Reading the Internal Software Version EdPP 21 4 2
6. The presence of AC interference in the sample under test may cause the measured value on the display to fluctuate This interference may become more noticeable in the presence of strong electric fields The effects of this interference may be reduced by twisting the leads around each other 4 3 4 Meter Readings When testing resistive samples the meter reading will stabilize within the first few hundred milliseconds On inductive loads e g transformers the measurement reading may take from several seconds to a few minutes to stabilize and depends greatly on the type of equipment and the imped ance of the equipment under test On very large samples such as utility transformers 10 to 15 minutes charging time may be necessary Micro Ohmmeter Model 6250 29 4 3 5 Stand by ST BY State This is the position that the Model 6250 returns to at the end of a measure ment cycle after the operator presses the START STOP button during a test any changes to the position of the rotary switch every low inductive mode measurement anerror is detected 4 4 Selecting the Test Range The Model 6250 has seven test ranges to choose from Table 1 lists the maximum resistance test current and resolution for each range Resistance Range Test Current Resolution 25009 1mA 100mQ 2500 10mA 10mQ 250 100mA 1mQ 2500mQ 1A 0 1mO 250mQ 10A 10g 25mO 10A 1pQ 5mQ 10A 0 1pQ Table 1 Turn the rotary switch to the desired range the range
7. instrument has been left unused for several months recharge the battery We recommend recharging the micro ohmmeter every month to ensure a full battery charge when used When replacing fuses install only fuses which are direct replace ments If the case needs cleaning do not use any alcohol or oil based cleaners Preferably use soapy water with a damp cloth or sponge The test leads and measuring wires must be in good condition and should be changed if there is any evidence of deterioration insula tion split burnt etc Never exceed the safety values indicated in the specifications Micro Ohmmeter Model 6250 5 1 1 International Electrical Symbols This symbol signifies that the instrument is protected by double or rein forced insulation CAUTION Risk of Danger Indicates a WARNING and that the operator must refer to the user manual for instructions before operating the instrument in all cases where this symbol is marked Important instructions to read and understand completely Important information to acknowledge PI e PB Risk of electric shock The voltage at the parts marked with this symbol may be dangerous MA Compliance with the Low Voltage amp Electromagnetic Compatibility European directives 73 23 CEE amp 89 336 CEE bx 1 2 CAT I CAT Il CAT III CAT IV 1 3 In the European Union this product is subject to a separate collection
8. 12 voltage leads incorrectly connected The unit will then return to the Stand by state When the error is corrected the test automatically begins again Micro Ohmmeter Model 6250 31 With the current switched off the residual voltage Vo across the resistor terminals is measured and displayed If this voltage level is too high Err 13 will be displayed The current I is switched on at the start of a measurement and remains on continuously until the unit is manually returned to the Stand by state by pressing the START STOP button The voltage across the resistor terminals V4 is measured and the measurement R V4 Vo I is displayed All subsequent measurements comprise only a V measurement as Vo remains in memory The timing sequence for measurement is shown in Figure 4 5 i NOTE After ending the measurement with the current turned off the 6250 will discharge the device under test as long as the test leads are connected to the device MES 0 1021 3L n 100ms 640ms 120ms 1200ms Figure 4 5 C connection check 0 residual voltage measurement stored 1 2 3 n successive voltage measurements across the resistor terminals The test is stopped by pressing the START STOP button Store the measurement by first pressing the MEM button then select the object and test location to store the measurement using the arrow buttons When the desired location has been selecte
9. 6 Setting the Language used for Printing Reports 22 Micro Ohmmeter Model 6250 4 2 7 Setting the Value for the Reference Temperature 22 4 2 8 Selecting the Method and Value for Ambient Temiperature tAnb iiiter 23 4 2 9 Selecting the Metal Type nEtA sssssss 24 4 2 10 Programming the Alpha Value ALPH 24 4 2 11 Selecting Temperature Units dEg 24 4 2 12 Setting Alarm Set Point Direction and Buzzer Level ALAP V tonto ue LU Rune t 25 4 2 13 Setting the Display Timeout LIQH 26 4 2 14 Clearing the Memory nEn seeesese 26 4 3 Operating Procedure ssssssseeeen enn 28 4 3 1 Connections and Readings sssesss 28 4 3 2 Test Lead Connection sssseeee 29 4 3 3 Very Low Resistance ssssseeeeee 29 4 3 4 Meter Readings W sssssenseseerses ss serne reen ens m 29 4 3 5 Stand by ST BY State 0 eect kernen nerne 30 4 4 Selecting the Test Range sss 30 4 5 Measurement Modes sssesseee eee 31 4 5 1 Measurement Safety Warnings sssss 31 4 5 2 Inductive Resistance Measurement Mode TYY 31 4 5 3 Resistance Measurement Mode W 33 4 5 4 Low Inductive Resistance Automatic Triggering Measurement Mode sse
10. Extra large classic tool bag ssseese Cat 2133 73 Inverter 12Vbc to 120VAc 200 Watt for vehicle use Cat 2135 43 115V Power Cord 2 ner rite eee oi ed va agile Cat 5000 14 Adapter RS 232 to USB 2 0 sss Cat 5000 60 Order Accessories and Replacement Parts Directly Online Check our Storefront at www aemc com store for availability Micro Ohmmeter Model 6250 7 CHAPTER 2 PRODUCT FEATURES 2 4 Description The Model 6250 Micro ohmmeter is used to perform low resistance measurements from 1uQ to 25000 There are seven ranges with test currents from 1mA to 10A The front end of the micro ohmmeter employs a four wire Kelvin configu ration which eliminates test lead resistance for a measurement accuracy of 0 0596 A built in circuit filters out AC signals The Model 6250 Micro ohmmeter is packaged in a sealed field case well suited for shop and field use Power is supplied by a long life NiMH battery pack with a built in recharger 110 220V The large easy to read liquid crystal display is 2 25 x 4 00 It displays the value of resistance metal type reference and ambient temperatures if selected alarm conditions if selected test current and range and test mode Resistive Inductive or Auto For operator safety and instrument protection the micro ohmmeter is fuse protected at the inputs Two fuses accessible behind the front panel protect against stored energy in
11. In SET UP mode shifts the decimal point and selects the unit Activates the secondary function of a button The e symbol appears on the left side of the display PRINT Immediate printing of the measurement to a serial printer If the temperature compensation function has been activated the calculated result and the temperatures involved are also printed PRINT MEM R 9 Retrieves stored data for printing this function is independent of the setting of the switch except in the OFF and SET UP positions Activates or deactivates the temperature compensation function to calcu late the resistance measured at a temperature other than ambient meas urement temperature ALARM Activates or deactivates the alarms High or low triggering values are adjusted in SET UP M W Selects the desired measurement mode prior to starting one of the follow ing measurements Inductive mode continuous test non inductive mode instantaneous test or non inductive mode with automatic triggering mul tiple tests METAL Selects the metal type for the temperature compensation calculation Cu Al or Other metal MEM Stores the measurement at an address identified by an object number OBJ and a test number TEST Two presses on this button are required one to select the location use the A and buttons to change the location and another to store the measurement MR Bu Der Retrieves stored data this
12. and test current will appear on the lower left side of the display vem Re Cu COM rur v Lt LA LOLOL imo Figure 4 4 The Model 6250 is now ready to start a test 30 Micro Ohmmeter Model 6250 4 5 4 5 1 Measurement Modes i NOTE For descriptions of all Fault Indicator Error codes refer to Chapter 7 Troubleshooting in this manual Measurement Safety Warnings WARNING 4 5 2 Never use test leads or measuring wires if there is any evidence of deterioration insulation split burnt etc Never exceed the safety values indicated in the specifications Never connect the unit to a live circuit When the unit is measuring resistance showing a high induc tive component transformers motors etc after ending the measurement with the measurement current cut off the unit then discharges this inductance and displays the icon for this entire duration Never disconnect the connection wires before the A icon dis appears Inductive Resistance Measurement Mode mM This mode is intended for performing measurements on inductive devices Press the Mw button until the MTL icon shows on the display From the Stand by state start a test by performing the following Connect the Kelvin probes to the test specimen Press the START STOP button Ifthe Kelvin probes are incorrectly connected the display will show error message Err 11 current leads incorrectly connected or Err
13. example the copper wire used in transformer or motor windings have high temperature coef ficients in the order of 0 4 C for copper or aluminum This results in resistance measurements that are highly dependent on the temperature of the device Activating temperature compensation will correct for this condi tion The Temperature Compensation function can be accessed by pressing the R button before the start of a test in Resistance and Inductive resis tance measurement mode It can also be activated at anytime during Auto measurement mode Its purpose is to compensate the measured or resistance value at the ambient temperature whether measured or programmed to the resis tance value that it should have at a reference temperature Micro Ohmmeter Model 6250 35 The compensated resistance level is expressed as follows R Tret R Tamp 1 alpha Tref 1 alpha Tamp Where R Tamb the resistance value measured at ambient temperature Tamb the temperature measured by a Pt100 probe or programmed by the operator Alpha thetemperature coefficient of the chosen metal Aluminum Copper Other metal Tref the programmed reference temperature to which the measurement is compensated to The Temperature Coefficient of Copper near room temperature is 0 393 percent per degree C This means if the temperature increases 1 C the resistance will increase 0 393 Example You have 100 feet of 20 gage wire and its
14. line 90V 264V 45Hz 420Hz using a standard line cord 4 Wire measurement with automatic compensation of undesirable voltages and lead resistance Large multi function backlit display Direct display of the measurement with its units range measure ment mode and if activated temperature compensation Measurement can be initiated from the front panel or remotely through the 9 pin communication port Rugged sealed case Micro Ohmmeter Model 6250 9 2 4 Control Features px eo Aus 232 com R 8 CuAl Other metal ey ALARM1 av gam DC PRINT mem 3 ALARM2 Va Ker REMOTE MR EZ OBJ TEST Pt rt ner iiv AVIA mo 2500mO 100mA mm AM STBY OPER Or QO OO Sov carm 3 ALARM METAL OO OQ i bod MICRO OHMMETER INSTRUMENTS MODEL 6250 START STOP Figure 2 1 1 Kelvin input terminals AC line recharging receptacle Large multi line backlit liquid crystal display RTD temperature input Communication remote operation port Range selection switch Test Start Stop button o nN Oo a F 9o mw Eight program function buttons 10 Micro Ohmmeter Model 6250 2 5 Button Functions A In SET UP mode selects a function or increments a flashing parameter v In SET UP mode selects a function or decrements a flashing parameter In SET UP mode accesses the function to be modified In Wrap Around mode selects the parameter to be modified from left to right
15. measured Ry and displays the resistance measurement Rx directly using the formula Ry V l The result is not affected by the other resistances encountered in the cur rent loop Ri Rs Ro as long as the total voltage drop induced across Ry remains below the voltage supplied by the source which is between 5 to 6V The maximum admissible lead resistance level is R V Vx 1 The use of Kelvin probes helps as they eliminate the effect of the lead resis tance R Figure 4 2 Ri Unit internal resistance Re Contact resistance Rr Lead resistance Ry Resistance to be measured 28 Micro Ohmmeter Model 6250 4 3 2 Test Lead Connection The measurement leads are connected using the four binding posts on the left side of the front panel as shown in Figure 4 3 Connect the two red leads to terminals C1 and P1 Connect the two black leads to terminals C2 and P2 Any drop in the voltage on the load terminals is measured between the two voltage V leads P1 and P2 The current leads C1 and C2 can deliver current from 1mA to 10A Figure 4 3 4 3 3 Very Low Resistance When measuring very low resistive values in the Q range the presence of stray DC currents may affect the accuracy of the measurements These currents can be present due to a variety of reasons including chemical or thermal EMF in samples made of dissimilar metals These EMFs are auto matically compensated for during the measurement process
16. of the control panel 6 6 Creating a DataView Report 1 Download a stored test see S 6 5 2 Select the test to create the DataView report for 3 GotoFile Create DataView Report from the main menu 52 Micro Ohmmeter Model 6250 6 7 Exporting the Report to a Spreadsheet or PDF File Exporting to a PDF file 1 2 With a report open in DataView go to File gt Print Worksheet In the Print dialog box that appears make sure that PDF XChange 3 0 is selected from the drop down menu then click OK When the PDF is complete the Save As dialog box will appear Choose a location to save it to and click Save Exporting to a Spreadsheet 1 With a report open in DataView go to File gt Export to Spread sheet Click the Export measurements button The Export Step 1 dialog box will appear Click the Browse button to open the Save As dialog box Choose a location to save your file from the Save in drop down menu at the top Then type a file name in the File name field at the bottom and click Save i NOTE For additional help on using the software use DataView s Help Menu which is located on the menu bar Micro Ohmmeter Model 6250 53 CHAPTER 7 TROUBLESHOOTING The Model 6250 incorporates internal diagnostics and will inform the oper ator of any condition needing attention through the use of error messages The available messages are described here 7 4 Fault Indicator
17. on the computer 18 Once connected the Found New Hardware dialog box will appear Windows will complete the driver installation process automatically Shortcuts for DataView and each instrument control panel selected during the installation process have been added to your desktop AN NOTE If you connected your instrument to the computer before installing the software and drivers you may need to use the Add Remove Hard ware utility to remove the instrument driver before repeating the process 6 2 Connecting the Instrument to your Computer The Model 6250 is supplied with a serial cable Cat 2119 45 necessary for connecting the instrument to the computer To connect the instrument to your computer connect one end of the serial cable to the communications port on the Model 6250 and the other end to the port on the computer 6 3 Establishing Communication to the Instrument 1 Double click the Micro ohmmeter Icon that was created during software installation located on the desktop to open the Micro ohmmeter Control Panel 2 From the main menu go to Instrument gt Connect to open the Connection dialog box f Connection mom Communications port COM1 X Communication rate 19200 oy Cancel Help Instrument model CHJ P RER Figure 6 4 Micro Ohmmeter Model 6250 49 3 Make sure the Communication port and rate match the port that the serial cable is plugged into and the baud rate t
18. the transformer terminals should be jumpered together before the instrument is disconnected One terminal of the sample should be grounded for safety Make connections to the transformer as shown in Figure 8 1 On larger transformers the measurement stabilization time will increase Figure 8 1 Micro Ohmmeter Model 6250 55 8 2 Measuring Resistance on Electric Motors For this test Kelvin probes should be used Figure 8 2 Make contact with each segment on the motor commutator Allow approximately two seconds for the display to stabilize o AEMC Figure 8 2 8 3 Battery Strap Measurements Proper battery strap resistance measurements will help ensure proper voltage output The resistance on battery strap connections should be measured using the Kelvin probes see Figure 8 3 Measurements must be made with the system power turned off The average resistance of all the intercell connections should be determined by totaling the individual resistances and dividing by the number of connectors Each individual cell resistance should not exceed the average by more than 1096 See the manufacturer s specifications for typical resistance values Figure 8 3 56 Micro Ohmmeter Model 6250 CHAPTER 9 MAINTENANCE Use only factory specified replacement parts AEMC will not be held responsible for any accident incident or malfunction following a repair done other than by its service center or by an approved re
19. uT100 Print buzz off low high EdSn displays internal serial number EdPP displays firmware number Lang Lg Gb Lg F trEF value tAnb Prb nPrb nEtA Copper alpha Aluminum alpha Other Metal ALPH value dEg dEgF dEgC ALAr Alarm 1 Alarm 2 LigH t OFF t 1 t 5 t 10 nEn dEL dEL 0 Y n The cursor buttons A V and P have the following functions in the SET UP menu TheupArrow A button selects the next function to be programmed in the top level menu and increments the value of the flashing variable in the sub menus The down Arrow V button selects the previous function to be pro grammed in the top level menu and decrements the value of the flashing variable in the sub menus The right arrow gt button selects the function displayed in the top level menu and moves the cursor one place to the right or validates the programming in the sub menus See Cables and Printer Used with the Interface Port 5 3 for proper connections Micro Ohmmeter Model 6250 19 4 2 2 Programming the 9 Pin Interface Port rS The 9 pin interface port on the top right side of the front panel can be pro grammed to any of five communication methods These consist of 1 Off Disable input and output functions of the interface port This choice saves battery power Trigger Enables the remote measurement function PC Activates an RS 232 link between a computer
20. voltage Vo across the resistor terminals is measured If this voltage level is too high the unit displays Err 13 and returns to Stand by position See Chapter 7 Troubleshooting for all error message descriptions The current I is switched on when the START STOP button is pressed The voltage across the resistor terminals V4 is measured and then the current is removed The measurement resistance result R V4 Vo I is displayed or error message Err 07 is displayed if an over range condition occurs Micro Ohmmeter Model 6250 33 The Model 6250 then returns to the Stand by state at the end of the mea surement The unit is ready to perform another measurement 100ms 240ms 360ms Figure 4 6 C connection check 0 residual voltage measurement M measurement of the voltage across the resistor terminals Store the measurement by first pressing the MEM button then select the object and test location to store the measurement using the arrow buttons When the desired location has been selected press the MEM button a second time to complete the data storage process 4 5 4 Low Inductive Resistance Automatic Triggering Measurement Mode This mode is intended only for measuring resistance on material without a time constant non inductive The use of the spring loaded Kelvin probes Cat 2118 73 or Cat 2118 74 listed in the accessories section are rec ommended for this mode
21. 15V power cord quick reference guide one pad of measurement result forms NiMH rechargeable 6V battery pack and USB stick supplied with product user manual and DataView software 1 4 4 Accessories and Replacement Parts Kelvin clips 10A Hippo 10 ft color coded leads Cat 1017 84 Kelvin clips 10A Hippo 20 ft color coded leads Cat 2118 70 Kelvin probes 1A spring loaded 10 ft color coded leads with banana plug terminations ereenn Cat 2118 73 Kelvin probes 1A spring loaded 20 ft color coded leads with banana plug terminations eseeeeeese Cat 2118 74 Kelvin Probes Pistol Grip 10 ft 10A Spring Loaded Cat 2118 75 Kelvin Probes 10 ft 10A Spring Loaded Cat 2118 77 Kelvin Clips 10 ft 1 10A sss Cat 2118 79 Kelvin Clips 20 ft 1 10A sssssssssseen Cat 2118 80 Cable PC RS 232 DB9 F F 6 ft Null Modem Cable Cat 2119 45 Replacement Battery 6V 8 5 Ah rechargeable NiMH Cat 2129 91 Measurement Result Forms replacement set of two Cat 2129 94 RTD temperature probe ssssssssssssse Cat 2129 95 RTD temperature probe with 7 ft 2m extension cable Cat 2129 96 Fuse set of 3 16A 250V 1 1 4 x 1 4 6 3x32mm fast blOW co ete ce hte eats tese TI Cat 2129 98 Fuse set of 10 2A 250V 3 4 x 3 16 5x20mm fast blow Cat 2129 99
22. 34 4 6 Ambient Temperature Compensation sssssssss 35 4 6 1 Activating the Compensation Function 38 4 7 Activating Alarms sssssssesse ene 39 5 MEMORY PRINTING eeeeeeeere eren enne nnne 40 5 1 Managing and Printing the Data in Memory 40 5 2 Displaying and Printing Stored Measurements 41 5 3 Cables and Printers Used with the Interface Port 43 6 DATAVIEW SOFTWARE ener 45 6 1 Installing DataView ccceccceeeceeeceeeeeeeeeeeeeeeeeeeeeeeeeeneeneaees 45 6 2 Connecting the Instrument to your Computer 49 Micro Ohmmeter Model 6250 3 6 3 Establishing Communication to the Instrument 49 6 4 Configuring the Instrument ssss 50 6 5 Downloading Stored Tests ssssseeees 52 6 6 Creating a DataView Report sssssssssse 52 6 7 Exporting the Report to a Spreadsheet or PDF File 53 7 TROUBLESHOOTING eeeeeeeee eere 54 7 1 Fault Indicators eec edet eec edet 54 8 APPLICATION EXAMPLES neeeeeee enne 55 8 1 Measuring Winding Resistance of Motors and Transformers o eee dieto dettes ridet pns 55 8 2 Measuring Resistance on Electric Motors 56 8 3 Bat
23. E MICRO OHMMETER SJ AEMC User Manual INSTRUMENTS S CDM CL 2 Statement of Compliance Chauvin Arnoux Inc d b a AEMC Instruments certifies that this instrument has been calibrated using standards and instruments traceable to international standards We guarantee that at the time of shipping your instrument has met its published specifications An NIST traceable certificate may be requested at the time of purchase or obtained by returning the instrument to our repair and calibration facility for a nominal charge The recommended calibration interval for this instrument is 12 months and begins on the date of receipt by the customer For recalibration please use our calibration services Refer to our repair and calibration section at www aemc com Serial Catalog 2129 81 Model 4 6250 Please fill in the appropriate date as indicated Date Received Date Calibration Due Chauvin Arnoux Inc d b a AEMC Instruments INSTRUMENTS www aemc com i READ CAREFULLY BEFORE USING FOR THE FIRST TIME Your instrument is equipped with a NiMH battery This technology offers several advantages Long battery charge life for a limited volume and weight Possibility of quickly recharging your battery Significantly reduced memory effect you can recharge your battery even if it is not fully discharged Respect for the environment no pollutant materials such as l
24. abled then an AutoPlay window should appear as shown Micro Ohmmeter Model 6250 45 EET dp FOF Change AW AutoPlay d tees A aus f d usr DATAVIEW 1 J v r J DIA AUTORUN M Gereral option Decii N em JL mom mm te eret i 2 Decii mu LI d Speed up my system aae 3 B Upgredexine Vine mere AutoPlay options in Contro Panes 2 Upgrades ioi legrede e NOTE If Autorun is disabled it will be necessary to open Windows Explorer then locate and open the USB stick drive labeled DataView to view the files on the drive 3 In the AutoPlay window select Open Folder to view Files 4 Double click on Setup exe from the opened folder view to launch the DataView setup program i NOTE If installing onto a Vista based computer the User Account Control dialog box will be displayed Select the Allow option to proceed 5 ASet up window similar to the one below will appear Lr Ced een Select an opion hom Pe bet below Opere Deienphon instal the Engksh verson of D salen ordo Wes computer vem Thet venon of Dataview rupe the Tolle mniburmends Diteview Update Femme Uog ases Gesund Tester Model 6470 8 5471 and 6472 User Mansa Megeheehes Model 1089 5080 5070 695 and 6598 Mero Diete Model 6240 art EISA Power Er ngy Logget Mode PEL HOC art PELTON Power Meter Model 8220 Power Qualty Logoer Model POL 100 and POLT 20 Powel s Modes IMS and T8458 Powe ad fl Modet 113 Power s
25. and the unit for configuring the Model 6250 and for conducting tests and storing results When activated the SX icon will appear on the display VT100 Activates an RS 232 link between a display terminal and the Model 6250 When activated the XI icon will appear on the display Print Activates the RS 232 link between a printer and the Model 6250 for direct printing of test results When activated the XX icon will appear on the display The RS 232 modes also allow programming of transmission speed The baud rate choices are 4800 9600 19200 and 31250 The required data configuration settings are 8 bits no parity 1 stop bit hardware control CTS e 20 Turn the rotary switch to the SET UP position Press the A button until rS appears on the top line of the display Press the button OFF will appear in the display Press the gt button to accept this setting or press the A button to scroll through the other choices of trigger trlG PC Terminal ut100 and Print The choices of PC terminal and print also require a baud rate selection After selecting PC ut100 or Print pressing the button will enter the baud rate selection menu Press the A button to toggle the choices for 4800 9600 19200 and 31250 When the desired baud rate is in the display validate it by pressing the button to return to the top level rS menu The ETI icon will appear in the display Proceed to the next pr
26. choose to clear the entire memory or the contents of a specific object e e 26 Turn the rotary switch to the SET UP position Press the A button until nEn appears on the top line of the display Press the button AEL will appear on the lower line of the display Toggle between clearing the entire memory dEL or a specific object dEL O using the A button To clear a specific object press the button when dEL O is in the display the top line will display Obj 01 with the 0 flashing Use the arrow buttons to select the object to be deleted The lower display will show dEL 02 for example if object number 2 is selected for deletion As you press the A button the selected object will increment accordingly Micro Ohmmeter Model 6250 e Delete the selected object by first pressing the button and toggling between Yes dEL Y or No dEL n Pressing the button while dEL Y is in the display will delete the contents of the selected object The display will momentarily display dashes and then return to display the next highest object location Pressing the gt button while dEL n is in the display will cancel the request e Repeat this process for each object to be deleted To clear the entire memory contents turn the rotary switch to the SET UP position Press the A button until nEn appears on the top line of the display Press the gt bu
27. d press the MEM button a second time to complete the data storage process 32 Micro Ohmmeter Model 6250 4 5 3 Resistance Measurement Mode WV This mode is intended for measuring contact and metal plating resistance levels and as a general rule any resistance level on material with a time constant that is less than a few milliseconds In this mode only one measurement is performed per cycle When the START STOP button is pressed the test currentis applied for approximately 400 milliseconds Residual voltage is measured a resistance measurement is taken and the test stops automatically The advantages of the resistance mode include Reduced power consumption as the test current is off between measurements Less heating of the measured resistance Improved compensation of stray voltages as these are measured and compensated before each resistance measurement Press the Mw button until the Wr icon shows on the display From the Stand by state start a test by performing the following Connect the Kelvin probes to the test specimen Press the START STOP button If the Kelvin probes are incorrectly connected the display will show error message Err 11 current leads incorrectly connected or Err 12 voltage leads incorrectly connected The unit will then return to the Stand by state When the error is corrected the test can begin again by pressing the START STOP button With the current switched off the residual
28. d 5 4 respectively Connection to a PC or Terminal Figure 5 3 Male Connector Female Connector Printer end Printer end Pin 6250 end Ry 2 3 Ty Ty 3 2 Ry Gnd 5 5 Gnd Micro Ohmmeter Model 6250 43 For a Direct Printer Connection 44 Figure 5 4 Male Connector Female Connector Printer end Printer end Pin Pin Ry 2 3 Ty Ty 3 2 Ry Gnd 5 5 Gnd CTS 8 8 CTS Micro Ohmmeter Model 6250 CHAPTER 6 DATAVIEW SOFTWARE 6 1 Installing DataView DO NOT CONNECT THE INSTRUMENT TO THE PC BEFORE INSTALLING THE SOFTWARE AND DRIVERS Minimum Computer Requirements Windows XP Windows Vista amp Windows 7 8 32 64 bit e 256MB of RAM for Windows XP 1GB of RAM for Windows Vista amp Windows 7 8 32 bit 2GB or RAM for Windows Vista amp Windows 7 8 64 bit e 80MB of hard disk space 200MB recommended USB port Windows is a registered trademark of Microsoft Corporation in the United States and other countries NOTE When installing the user must have Administrative access rights during the installation The users access rights can be changed after the installation is complete DataView must be reinstalled for each user in a multi user system USB Flash Drive Install 1 Insert the USB stick into an available USB port wait for driver to be installed 2 If Autorun is en
29. e Used in conjunction with the temperature correction option e Metal Type Allows the selection of the most common metal types as well as user selectable type Used in conjunction with the temperature correction option Alarm 1 and 2 Enables and disables alarm number 1 or 2 notification e Lock Programming Disables the ability to change the configuration of the instrument The configuration panel also contains four command buttons e Delete Tests Displays a dialog box which allows the deletion of selected tests Write to Instrument Programs the micro ohmmeter using the current settings e Read from Instrument Reads the current configuration of the micro ohmmeter attached via the communications cable e Cancel Closes the Configuration dialog box and brings up the Control Panel Once all of the fields have been configured click on the Write to Instru ment button to configure the instrument and close the Configuration dialog box Micro Ohmmeter Model 6250 51 6 5 Downloading Stored Tests 1 To download stored tests go to Instrument Download 2 The Select Tests dialog box will appear displaying a list of tests stored in the instrument Cancel feet Deselect Ab Figure 6 6 3 Click on the desired test to download hold the Ctrl key to select multiple tests then click the Download button To edit the name and other properties of the test double click on the Test s name on the left side
30. ead or cadmium in compliance with the applicable regulations After prolonged storage the battery may be completely discharged If so it must be completely recharged Your instrument may not function during part of this recharging operation Full recharging of a completely discharged battery may take several hours NOTE In this case at least 5 charge discharge cycles will be necessary for your battery to recover 95 of its capacity hale To make the best possible use of your battery and extend its effective service life Only use the charger supplied with your instrument Use of another charger may be dangerous Only charge your instrument at temperatures between 0 and 40 C e Comply with the conditions of use defined in the operating manual Comply with the storage conditions specified in the operating manual NiMH technology allows a limited number of charge discharge cycles depending significantly on The conditions of use e The charging conditions Please refer to S 9 for correct replacement of the battery must be entrusted to a qualified recycling company or to a company e 1 gg Do not dispose of the battery pack with other solid waste Used batteries wmm Specialized in processing hazardous materials Table of Contents INTRODUCTION eeeeeee eerte nn nnne nnnm 5 1 1 International Electrical Symbols
31. for return instructions FUSES Before replacing the internal batteries or fuses the front panel must first be removed Use a Phillips Head screwdriver to remove the four screws from the feet on the bottom of the case e Pull out the chassis from the top The two fuses are located on the left side of the chassis F1 is located near the C1 and P1 terminals F2 is located directly below on the bottom power supply board assembly Fuse F1 is a 6 3x32 mm fast acting 16A 250V low internal resistance protecting the current source from outside voltages on energized specimens Fuse F2 is a 5 0x20 mm fast acting 2A 250V protecting the battery charger power supply board Micro Ohmmeter Model 6250 59 Repair and Calibration To ensure that your instrument meets factory specifications we recommend that it be scheduled back to our factory Service Center at one year intervals for recalibration or as required by other standards or internal procedures For instrument repair and calibration You must contact our Service Center for a Customer Service Authorization Number CSA This will ensure that when your instrument arrives it will be tracked and processed promptly Please write the CSA on the outside of the shipping container If the instrument is returned for calibration we need to know if you want a standard calibration or a calibration traceable to N I S T Includes calibration certificate plus recorded calibration da
32. front panel as shown in Figure 4 8 Figure 4 8 To measure the ambient temperature at the specimen plug the optional temperature sensor onto the extension cable and plug the extension cable into the temperature port on the front panel as shown in Figure 4 9 Place the temperature sensor in contact with the specimen or in close proximity to it Allow 2 minutes for the sensor to normalize to the specimen temperature before starting a temperature compensated measurement Micro Ohmmeter Model 6250 37 Figure 4 9 4 6 1 Activating the Compensation Function Check to ensure that all desired programming and connections are made correctly See Setting the Value for Reference Temperature 84 2 7 and Selecting the Method for Ambient Temperature 84 2 68 e Select the range and the measurement mode e Press the R O button The following information will be displayed on screen 1 R 9 2 Metal type selected Cu Al or Other Metal 3 Temperature levels Tref followed by Tamb e Press the START STOP button e The unit performs a measurement cycle and directly displays the compensated resistance value and depending on set up displays one of the following 1 The programmed ambient temperature level 2 The temperature level measured by the temperature sensor 38 Micro Ohmmeter Model 6250 3 if the temperature sensor is activated but is incorrectly connected or not connected at all 4 The measured temperature is out of ra
33. function is independent of the selector setting of the switch except for the OFF and SET UP positions Data is viewed using the A and buttons The R 6 rm w and ALARM buttons can be used Turns the display backlight ON or OFF e1 Activates or deactivates the buzzer and adjusts the sound level Micro Ohmmeter Model 6250 11 2 6 Display Symbols The display incorporates two lines of characters to display test results as well as a library of symbols to assist the operator in determining conditions at a glance The symbols that can appear are shown in Figure 2 2 and are detailed here e R 9 CuAl Other metal PZJ ALARM 1 av rr ec PRINT MEM EE ALARM 2 YA h CCE F REMOTE MR OBJ TEST 2 4 7 I E Liv AVILA LOT mo AUTO 2500mQ2 100mA YY AMW ST BY OPER Figure 2 2 e Buzzer ON f Battery condition R 9 Temperature compensation ON Cu Copper metal type selected Al Aluminium metal type selected Other metal User defined metal type selected COM Communication port active ALARM 14A Alarm 1 active with high set point ALARM 1 Y Alarm 1 active with low set point ALARM2A Alarm 2 active with high set point ALARM 2 Y Alarm 2 active with low set point OBJ First position locator for data stored in memory TEST Second position locator for data stored in memory C F Temperature displayed in either degrees Centigrade or Fahrenheit PRINT Printing curren
34. he instrument is config ured to see 84 2 2 4 Fromthe Instrument model drop down menu select the correct model if necessary 5 Once the proper parameters have been specified click OK 6 4 Configuring the Instrument 1 Establish a connection to the instrument see S 6 3 2 Goto Instrument gt Configure from the main menu to open the Con figuration Panel dialog box Necro Ohmmeter Model 6250 Configuration Panel Mess semert Type Tempernture Correction Inductive eo OF Tie Arsene Retenen Temperature TEF 2 Mite Arbiert Temoenat re Tart Metal Type A User value 730 Copper Agha 3 53 Ver Measured by PT 10 Aummum Aasi er Richer 1 Av C Nas 2 9 On on oo on Treshoid Threshold TT Q gh inn 9 Hg on 9 Low om low Burzer Buezer Lock progamme Hh low aw High low mos Delete Tests Vite to instrument Peed from Inet seer Cancel k Figure 6 5 This dialog box allows you to configure the Measurement Type Tempera ture Correction Ambient Temperature Metal type Lock programming and enable set the two Alarm thresholds Configuration Panel Options e Measurement Type Specifies the type of measurement that will be performed e Temperature Correction Enables and disables compensation of resistance measurements based on temperature e Ambient Temperature Allows User to enter the ambient temperature or use the PT100 temperature probe to measure the 50 Micro Ohmmeter Model 6250 ambient temperatur
35. inductive loads Enhanced internal circuitry protects against possible inductive kickback when the current is shut off A built in thermal switch protects the micro ohmmeter against overheating on the 10A range when in continuous use 8 Micro Ohmmeter Model 6250 2 2 Applications Some of the more popular and most frequent uses of the micro ohmmeter are in applications for 2 3 Checking metallic coating resistance especially in aeronautics Ground connections and continuity measurement Resistance measurements on motors and transformers Contact resistance measurements on breakers and switches Component measurement Electrical cable resistance measurement Mechanical bond tests Wire to terminal connections Aircraft and rail bonds Many other very low resistance samples Key Features Measures from 1492 to 2500 Test current selection from 1mA to 10A RTD temperature measurement optional Automatic or manual temperature compensation Two programmable alarms with high or low triggering Stores up to 1500 test results Selectable Inductive or Resistive test modes Operator safety by automatic discharge of residual charge on the equipment under test Instantaneous continuous or multiple test operation Selectable metal type Copper Aluminum or other for temperature compensation Internal rechargeable batteries conduct up to 5000 10A tests A built in battery pack recharger recharges the batteries by connecting to the AC
36. it to the right Repeat this process for each of the 5 digit locations After the 5th digit is programmed press the gt button again to return to the top level of the Reference Temperature set up menu To proceed to the next programming variable press the A button i NOTE The program limits for the reference temperature are 32 0 to 130 0 F and 10 0 to 130 0 C Attempting to set values outside these limits will cause error message Err23 Entry Out of Range to appear in the display Micro Ohmmeter Model 6250 4 2 8 i Selecting the Method and Value for Ambient Temperature tAnb Turn the rotary switch to the SET UP position Press the A button until tAnb appears on the top line of the dis play Press the 9 button to enter the ambient temperature sub menu The first choice here is to decide if ambient temperature will be measured using the RTD temperature probe accessory or if it will be programmed using the same method as described for refer ence temperature Prb measure the ambient temperature using the RTD probe accessory or nPrb no probe manually enter the ambient temperature will be displayed press the A button to toggle between the two choices If measuring the ambient temperature is desired press the gt button when Prb is in the display The lower display will momen tarily show dashes and then return to the top level ambient temperature menu If manually en
37. lue will be dis played The following measurement components are also accessible if stored The selected memory location will display The number of the object and test that correspond to the memory location The active range and current level during the measurement The measurement value with any compensation used The alarm icon for any active alarms that occurred during the measurement The parameters set for the alarm threshold reference temperature ambient temperature and metal correction coefficient are not directly accessible They are accessible by pressing the following Press the R button to display ambient temperature at the time of the stored measurement e Press the R button a second time to display the reference tem perature that the measurement was compensated to Press the frn we button to display the type of metal and alpha value used for compensation at the time of the measurement Pressthe PRINT button to print the measurement results stored at the current memory location An optional serial printer is required for this feature Micro Ohmmeter Model 6250 41 i NOTE Only memory locations with stored measurements are accessible Measurement data stored in memory can be accessed directly from any Switch position except OFF and SET UP for printing Press the yellow 2 button followed by the PRINT MEM button to access measurement results stored in memory for printing A
38. mQ 0 05 0 3mQ 1A 2500mV 250 1mQ 0 05 3mQ 100mA 2500mV 2500 10mQ 0 05 30mQ 10mA 2500mV 25002 100mQ 0 05 300mQ 1mA 2500mV Temperature Measurement 3 wire 100Q Platinum RTD Accuracy 0 5 C Resolution 0 1 C Influence From Environment Conditions Temperature 0 1 per 10 C typical 0 25 max Humidity 0 5 max from 10 to 90 Battery Voltage 0 1 from 4 5 to 7 5V Open Circuit Voltage 7VDC max 14 Micro Ohmmeter Model 6250 Operating Voltage 5 to 6VDC Power Source Rechargeable 6V 8 5 Ah NiMH battery pack Built in 90 to 256V 45 to 420Hz charger Battery Life 5000 10A tests typical Battery Charging 120 240VAc x 20 45 to 400Hz line voltage Auto Power Off when battery voltage 5 0V Low Battery Indication The symbol is displayed when the battery needs to be recharged Overload Input Protection 250Vrms Fuses F1 1 1 4 x 1 4 6 3x32mm fast acting 16A 250V current source protection F2 3 4 x 3 16 5x20mm fast acting 2A 250V charging circuit protection 3 2 Mechanical Dimensions 10 63 x 9 84 x 7 09 270 x 250 x 180mm Weight 8 1 Ibs 3 69kg approx without leads Case Protection ABS plastic polycarbonate watertight to IP64 cover closed water resistant to IP53 cover open Color Safety yellow case with gray faceplate 3 3 Display Blue Electroluminescent backlit Liquid Crystal Display LCD 2 25 x 4 00 with icons and two numeric fields for data presentation
39. n optional serial printer is required for this feature Use the arrow buttons to select the object and test to be printed A typical printed report using the optional DPU 414 30B portable battery operated printer Cat 2140 21 is shown below CHAUVIN ARNOUX CA6250 NUMBER 2 wid RER aneia had Bap era le SUR REOR gre eee OBJECT TEST DESCRIPTION RESENS REE eae cele eevee Apel ERR eee Meas Date Meas Type LOW INDUCTIVE Metal Type Cu Coeff Metal 393 Measurement Temperature 23 2 C Reference Temperature g 20 0 C Resistance Value Tamb E 1294 6 Ohm Resistance Value Tref i 1287 2 Ohm COMMENTE iira aaia AAE AA a Next test date Figure 5 1 Enclosed with this manual is a pad containing 50 forms to record the measurement results manually They may be photocopied as needed or downloaded from our website at www aemc com techinfo index asp ocated in the Micro ohmmeter section 42 Micro Ohmmeter Model 6250 5 3 Cables and Printers Used with the Interface Port The DB9 interface port can be used to trigger remote measurements TRIG Wiring for remote triggering of a test is detailed in Figure 5 2 The READY LED indicates that a measurement can be made SYN READY LED i Trigger button to start the measurement Figure 5 2 The DB9 interface port can be used for RS 232 communication with a PC terminal or a printer The main connection pins used are detailed in Figures 5 3 an
40. nge 10 to 55 C If the temperature is out of range or if the sensor leads are disconnected the Model 6250 displays Err 10 Temperature compensation can be toggled ON or OFF after the mea surement is completed in resistive and inductive modes or at any time in AUTO mode 4 7 Activating Alarms The alarm programming menu offers the option of choosing one or two alarm thresholds An alarm comprises a value an activation direction above A or below V the setpoint and a sound level setting for the buzzer should the alarm become active i NOTE Alarms are activated by successively pressing the 2 button fol lowed by the ALARM button The display will indicate one of the following after each set of button presses Alarm 1 and the activation direction A or V Alarm 2 and the activation direction A or V Alarm 1 and Alarm 2 and activation directions A or V for each These values and direction parameters are programmable See Setting an Alarm Set Point Direction and Buzzer Levels 84 2 12 The buzzer will sound when Alarm 1 and or Alarm 2 threshold values are reached Micro Ohmmeter Model 6250 39 CHAPTER 5 MEMORY PRINTING 5 1 Managing and Printing the Data in Memory The memory is organized into locations called Objects and Tests There are 99 objects each containing a maximum of 99 tests measure ments The maximum number of measurements that can be stored is approximately 1500 After
41. nty html Please print the online Warranty Coverage Information for your records What AEMC Instruments will do Ifamalfunction occurs within the one year period you may return the instrument to us for repair provided we have your warranty registration information on file or a proof of purchase AEMC Instruments will at its option repair or replace the faulty material REGISTER ONLINE AT www aemc com Warranty Repairs What you must do to return an Instrument for Warranty Repair First request a Customer Service Authorization Number CSA by phone or by fax from our Service Department see address below then return the instrument along with the signed CSA Form Please write the CSA on the outside of the shipping container Return the instrument postage or shipment pre paid to Ship To Chauvin Arnoux Inc d b a AEMC Instruments 15 Faraday Drive Dover NH 03820 USA Phone 800 945 2362 Ext 360 603 749 6434 Ext 360 Fax 603 742 2346 or 603 749 6309 E mail repair aemc com Caution To protect yourself against in transit loss we recommend you insure your returned material NOTE You must obtain a CSA before returning any instrument 9 AEMC INSTRUMENTS 06 14 99 MAN 100288 v21 Chauvin Arnoux Inc d b a AEMC Instruments 15 Faraday Drive Dover NH 03820 USA Phone 603 749 6434 Fax 603 742 2346 www aemc com
42. ogramming variable by pressing the A button Micro Ohmmeter Model 6250 4 2 3 4 2 4 4 2 5 e Setting the Buzzer Level bUZZ Turn the rotary switch to the SET UP position Press the A button until bUZZ appears on the top line of the display Press the gt button to scroll through the choices of OFF no icon displayed LOW small buzzer icon e displayed or HIGH large buzzer icon e displayed Each choice will display the corre sponding icon in the top left corner of the display along with the associated audible sound When the desired sound level is displayed press the button to accept it and return to the top level of buzzer set up To proceed to the next programming variable press the A button Reading the Internal Serial Number EdSn Turn the rotary switch to the SET UP position Press the A button until EdSn appears on the top line of the display Press the button to scroll through the serial number There are 10 digits in the serial number The first press will display the first five digits The second press will display the second five digits EXAMPLE First press displays t0302 Second press displays 044 0 Third press displays 0001 A Press the gt button again to return to the top level of the Serial Number set up menu To proceed to the next programming variable press the A button Reading the Internal Software Version EdPP Turn the rotary switch to the SET UP positi
43. on Press the A button until EdPP appears on the top line of the display Press the gt button to display the firmware version Press the button again to return to the top level of the Software Version set up menu To proceed to the next programming variable press the A button Micro Ohmmeter Model 6250 21 4 2 6 22 Setting the Language used for Printing Reports LAnG Turn the rotary switch to the SET UP position Press the A button until LAnG appears on the top line of the display Press the button to enter the language selection sub menu Next press the A button to toggle between English Lg Gb or French Lg F Press the button to validate the selection and return to the top level of the Language set up menu To proceed to the next programming variable press the A button Setting the Value for the Reference Temperature trEF Turn the rotary switch to the SET UP position Press the A button until trEF appears on the top line of the display Press the gt button to enter the reference temperature sub menu The current reference temperature will be displayed with the lead ing digit flashing Use the A button to change the leading digit The minus symbol can also be programmed in this location When the desired value is reached press the button to move the next digit to the right Use the A button to change this digit then press the button to again move to the next dig
44. op level of the Temperature units set up menu To proceed to the next programming variable press the A button Setting Alarm Set Point Direction and Buzzer Level ALAr Turn the rotary switch to the SET UP position Press the A button until ALAr appears on the top line of the display Press the gt button Alarm 1 and its set point direction and buzzer level will appear with ALARM 1 flashing To modify the settings of Alarm 1 press the button The direc tion arrow will now be flashing To modify Alarm 2 press the A button ALARM 2 will then be flashing When the direction arrow is flashing it may be changed by press ing the A button to toggle between HIGH A activates above set point and LOW Y activates below set point Next press the button to adjust the buzzer level for this alarm The buzzer icon en will be flashing The choices are OFF no icon displayed LOW small buzzer icon e displayed or HIGH large buzzer icon e displayed The selection is made by pressing the A button while the icon is flashing Next program the set point value used to trigger the alarm ignor ing the decimal point by pressing the button The leading digit will be flashing Adjust the digit value using the A button then press the 9 button to move to the next digit to the right Repeat the process for each of the five digits Press the button when the numeric value is set to the desired number The decimal
45. ours for a completely discharged battery If the battery symbol is flashing the battery needs to be recharged The battery will charge in both the ON and OFF mode nthe ON mode the charging indicators will show on the display nthe OFF mode no display will show during charging Connect the Model 6250 to 120VAc using the power cord provided charg ing starts automatically i NOTE Testing can not be conducted while charging the batteries Button presses are ignored when charging is in process CHARGING INDICATORS bAton the small display and CHrg on the main display signifies fast charging in progress bAton the small display and CHrg flashing on the main display signifies slow charging starts off with fast charge temperature conditions permitting bAton the small display and FULL on the main display signifies that charging is complete If the instrument is turned on and the battery voltage is gt 5V then the normal use of the device is permitted 58 Micro Ohmmeter Model 6250 9 4 Battery and Fuse Replacement i NOTE Make sure that no terminals are connected and that the switch is in the OFF position before opening the front panel BATTERY Replacing the battery causes data to be lost from the memory The battery should only be replaced by a qualified technician or sent back to the factory for replacement and standard calibration See the Repair and Calibration section
46. p automatically Inductive and AUTO testing will stop when the operator pushes the START STOP button a second time 9 Store the test result in memory by pressing the MEM button at the conclusion of a test The next available location will be presented on the top line of the display To use this location press the MEM button a second time 10 Recall readings from memory by pressing the yellow 2 button fol lowed by the MEM button The last measurement stored in location OBJ X TEST X will be displayed Use the A WV and gt buttons to select the object and test memory location to review All information from the measurement is available for review including metal type ambient and reference temperatures resistance at ambient and refer ence temperatures test range and test current Typical Operational Display Temperature compensation active cack gt ULL ee Buzzer active gt we R e Cu Metal type Copper Alarm 1 hi set point active 3x ALARM 1 4 IL Reference temperature IT 16 TI Imo sm WW ST BY OPER Test in process _ x Inductive test mode a tr Resistance measurement Measurement units Measurement range Test current Figure 4 1 18 Micro Ohmmeter Model 6250 4 2 Instrument Configuration SET UP Mode 4 2 1 Program Menu Tree The menu tree below shows the order in which functions appear in the Menu and sub menus of the set up mode Set r5 OFF Trig PC
47. pair center 9 1 9 2 Warning To avoid electrical shock do not attempt to perform any servicing unless you are qualified to do so Do not perform any service while the micro ohmmeter is on any circuit To avoid electrical shock and or damage to the instrument do not get water or other foreign agents into the electronic module Make sure the internal battery is fully charged prior to testing If the instrument has been left unused for several months recharge the battery We recommend recharging the micro ohmmeter every month to ensure a full battery charge when used When replacing fuses install only fuses which are direct replace ments Cleaning WARNING Disconnect the instrument from any source of electricity e If the case needs cleaning do not use any alcohol or oil based cleaners Preferably use soapy water with a damp cloth or sponge Dry immediately after cleaning Avoid water penetration into the electronic module Make sure the micro ohmmeter and all leads are dry before fur ther use Micro Ohmmeter Model 6250 57 9 3 Charging Recharging the Battery AC POWER SELECTION The Model 6250 may be recharged from 90 to 264Vac 45 to 420Hz The instrument includes a 110V line cord which provides the charging voltage for the rechargeable battery CHARGING THE BATTERY The Model 6250 should be charged to a full charge before using it for the first time Charging to full capacity may take up to 6 h
48. point and units MQ or Q will be flashing Set the desired resolution and units by pressing the A button Each press will move the decimal point one place to the right Cycling through milliohms and then through ohms To accept the alarm settings once the decimal point and units are at the desired values press the gt button This will bring you to Alarm 2 Repeat the process as necessary to set Alarm 2 s conditions Micro Ohmmeter Model 6250 25 4 2 13 When Alarm 2 is set press the 9 button to return to the top level of the alarm programming menu ALAr will again appear on the top line and the bottom line will be blank To proceed to the next programming variable press the A button Setting the Display Timeout LlgH This setting determines the length of time that the backlight will stay on after the last button press The choices are OFF function disabled backlight stays on continuously when activated 1 5 or 10 minutes e e 4 2 14 Turn the rotary switch to the SET UP position Press the A button until LIgH appears on the top line of the display Press the button the last programmed value will appear in the display Press the A button to toggle through the choices of OFF t 1 t 5 and t 10 When the desired length of time is in the display press the button to validate the selection To proceed to the next programming variable press the A button Clearing the Memory nEn You can
49. red position If the resistance of the device under test is unknown start with the highest range 25000 and work down to increase resolution as necessary 2 Select the test method best suited for the measurement by press ing the Mw button to select inductive continuous test resistive instantaneous test or AUTO multiple testing 3 Activate the backlight if necessary by pressing the ES button 4 Activate the buzzer if desired by pressing yellow 2 button followed by the button 5 Activate alarms if desired by pressing the yellow 2 button followed by the ALARM button Successive presses of this two button sequence will select Alarm 1 Alarm 2 or both 6 Select the metal type for the device under test by pressing the yellow 2 button followed by the METAL button Successive presses of this two button sequence will select Copper Cu Aluminum Al or Other metal This will be needed for temperature compensation Micro Ohmmeter Model 6250 17 7 Activate temperature compensation by pressing the R button The reference temperature will appear followed by the ambient temperature on the top line of the display 8 Start the test by pressing the START STOP button The resistance reading will appear on the lower line of the display The symbol OPER will appear on the lower left to indicate that a test is in process The Stand by symbol ST BY will appear when the test is completed Resistive element tests will sto
50. resistance is 1 015Q at 20 C room temp If the temperature of the wire goes up 10 C the resistance will change by 0 0399Q 10 0 00393 1 0150 0 03990 The wire resistance will now be 1 0150 0 03990 1 05490 The table below provides the temperature coefficients of the more common metals and alloys The Alpha values for Copper and Aluminum are pre programmed into the Model 6250 Others may be programmed by selecting Other Metals and then programming in the alpha constant from the table or other sources 1 o Material Element Alloy jud Ma C Aluminum Element 4 030 Copper Element 3 930 Nickel Element 5 866 Iron Element 5 671 Molybdenum Element 4 579 Tungsten Element 4 403 Silver Element 3 819 Platinum Element 3 729 Gold Element 3 715 Zinc Element 0 847 Steel Alloy 3 000 Nichrome Alloy 0 170 Nichrome V Alloy 0 130 Table 2 36 Micro Ohmmeter Model 6250 A 1000 platinum RTD can be connected to the front panel of the Model 6250 to perform compensated measurements The temperature sensor and extension cable assembly listed in the Accessories section are rec ommended The three pin temperature compensation port is located to the left of the interface port and is configured as shown in Figure 4 7 Pt100 connector Figure 4 7 To measure the ambient air temperature at the Model 6250 plug the optional temperature sensor directly into the temperature port on the
51. s Err 1 Err 2 Err 3 Err 4 Err 5 Err 6 Err 7 Err 8 Err 9 Err 10 Err 11 Err 12 Err 13 Err 21 Err 22 Err 23 Err 24 Err 25 Err 26 Err 27 Err 28 Err 29 Low battery level Internal problem Unable to measure battery Unable to measure temperature Internal temperature too high let the instrument cool down Unable to establish current measurement Measurement out of range Internal problem Measurement cycle stopped Temperature sensor incorrectly connected or missing Current leads incorrectly connected Voltage leads incorrectly connected or measured resistance too high Residual voltage too high Adjustment out of range Measured value out of range Entry out of range Unable to write to memory Unable to read memory Memory full Memory empty no data available Memory check problem Object or test number incorrect WARNING If error message 2 3 4 or 8 appears the instrument must be sent to a qualified organization for repair See the Repair and Calibration section for return instructions 54 Micro Ohmmeter Model 6250 CHAPTER 8 APPLICATION EXAMPLES The proper procedures for using the Model 6250 in some specific applica tions are outlined throughout this section 8 1 Measuring Winding Resistance of Motors and Transformers WARNING Prior to and after testing a transformer winding the energy stored in the magnetic field must be dissipated by shorting the trans former terminals For additional safety
52. system for recycling electrical and electronic components In accordance with directive WEEE 2002 96 EC Definition of Measurement Categories For measurements on circuits not directly connected to the AC supply wall outlet such as protected secondaries signal level and limited energy circuits For measurements performed on circuits directly connected to the electrical distribution system Examples are measurements on household appliances or portable tools For measurements performed in the building installation at the distribution level such as on hardwired equipment in fixed installation and circuit breakers For measurements performed at the primary electrical supply lt 1000V such as on primary overcurrent protection devices ripple control units or meters Receiving Your Shipment Upon receiving your shipment make sure that the contents are consistent with the packing list Notify your distributor of any missing items If the equip ment appears to be damaged file a claim immediately with the carrier and notify your distributor at once giving a detailed description of any damage Save the damaged packing container to substantiate your claim 6 Micro Ohmmeter Model 6250 1 4 Ordering Information Micro ohmmeter Model 6250 sss Cat 2129 81 Includes extra large tool bag set of two 10ft Kelvin clips 10A Hippo one RS 232 DB9 F F 6 ft null modem cable RS 232 to USB adapter US 1
53. t test result or tests stored in memory MEM Displayed measurement about to be stored in memory 12 Micro Ohmmeter Model 6250 REMOTE Instrument under computer control MR Memory recall Memory utilization indicator mV mQ Units of measure Ae Resistive material test mode selected mm Inductive material test mode selected AUTO Repetitive test mode selected ST BY System idle ready to start a test OPER Test in process Second function of a button activated CAUTION Refer to the user manual before using the instrument 25000 1mA 2500 ohm 1 milliamp test range selected 2500 10mA 250 ohm 10 milliamp test range selected 250 100mA 250hm 100 milliamp test range selected 2500mO 1A 2500 milliohm 1 Amp test range selected 250mO 10A 250 milliohm 10 Amp test range selected 25mO 10A 25 milliohm 10 Amp test range selected 5mO 10A 5 milliohm 10 Amp test range selected Micro Ohmmeter Model 6250 13 CHAPTER 3 SPECIFICATIONS 3 1 Electrical Specifications are given for an ambient temperature of 23 C 5 relative humidity of 45 to 75 and a supply voltage of 6V 0 1V Measurement Method 4 Wire Kelvin resistance measurement with compensation for stray resid ual voltages Measurement Ranges Range Resolution se a year a i BE 5mO 0 10 0 15 1 002 10A 50mV 25mO 1pQ 0 05 3u 10A 250mV 250mO 1000 0 05 3002 10A 2500mV 2500mQ 0 1
54. ta Ship To Chauvin Arnoux Inc d b a AEMC Instruments 15 Faraday Drive Dover NH 03820 USA Phone 800 945 2362 Ext 360 603 749 6434 Ext 360 Fax 603 742 2346 or 603 749 6309 E mail repair aemc com Or contact your authorized distributor Costs for repair standard calibration and calibration traceable to N I S T are available NOTE You must obtain a CSA before returning any instrument Technical and Sales Assistance If you are experiencing any technical problems or require any assistance with the proper operation or application of your instrument please call mail fax or e mail our technical support team Chauvin Arnoux Inc d b a AEMC Instruments 200 Foxborough Boulevard Foxborough MA 02035 USA Phone 800 343 1391 508 698 2115 Fax 508 698 2118 E mail techsupport aemc com WWW aemc com NOTE Do not ship Instruments to our Foxborough MA address 60 Micro Ohmmeter Model 6250 Limited Warranty The Micro ohmmeter Model 6250 is warranted to the owner for a period of one year from the date of original purchase against defects in manufacture This limited warranty is given by AEMC Instruments not by the distributor from whom it was purchased This warranty is void if the unit has been tampered with abused or if the defect is related to service not performed by AEMC Instruments Full warranty coverage and product registration is available on our website at www aemc com warra
55. taking a measurement it may be stored in memory by pressing the MEM button The MEM icon blinks and the first available Object and Test location for storing this measurement is displayed with the last digit of the test number blinking Example Object 1 and Test 4 are displayed and the 4 will be blinking Hgs OBJ TEST The object and test location can be changed using the arrow buttons FREE is displayed when the location is empty e OCC is displayed when the location has data stored in it After choosing the measurement s memory location pressing the MEM button a second time validates memory storage in a FREE location If an occupied location is selected the OCC message blinks to warn that this memory location is already taken Storage action in this location requires pressing the MEM button again The previous measurement in this location will be replaced by the new measurement 40 Micro Ohmmeter Model 6250 5 2 Displaying and Printing Stored Measurements NOTE To display or print a measurement result stored in memory press the yellow 2 button followed by the MR button The measurement value for the last object and test saved is displayed Example Object 1 and Test 3 are displayed LI I LI LI LL OBJ TEST The test unit number will be blinking In this example the 3 will be blinking Change the object and test numbers using the arrow buttons As you change memory locations the stored measurement va
56. tering the ambient temperature is desired press the gt button when nPrb is in the display The ambient temperature may now be manually entered The current programmed ambient temperature will be displayed with the leading digit flashing Use the A button to change the leading digit The minus symbol can also be programmed in this location When the desired value is reached press the button to move the next digit to the right Use the A button to change this digit then press the button to again move to the next digit to the right Repeat this process for each of the 5 digit locations After the 5th digit is programmed press the gt button again to return to the top level of the ambient temperature set up menu To proceed to the next programming variable press the A button NOTE The program limits for the reference temperature are 32 0 to 130 0 F and 10 0 to 130 0 C Attempting to set values outside these limits will cause error message Err23 Entry Out of Range to appear in the display Micro Ohmmeter Model 6250 23 4 2 9 4 2 10 4 2 11 24 Selecting the Metal Type nEtA Turn the rotary switch to the SET UP position Press the A button until nEtA appears on the top line of the display Press the button to toggle through the choices of Copper Cu Aluminum Al or Other Metal With each press of the right arrow button the metal type icon appears at the top of the display nEtA appears on
57. tery Strap Measurements sssssee 56 9 MAINTENANCE 1eeeeernnene nnne nnne nnnm nnn nnn 57 9 1 Warning ccce ec ee e ecc doe e 57 9 2 AEI G ea rrt A 57 9 3 Charging Recharging the Battery ssessssss 58 9 4 Battery and Fuse Replacement ssssseese 59 Repair and Calibration sssssssssssssssseeeeeennnes 60 Technical and Sales Assistance sess 60 Limited Warranty elect eme AEA eR tee tente tete ana 61 Warranty Repara 23 E EEEE E TEENER 61 4 Micro Ohmmeter Model 6250 CHAPTER 1 INTRODUCTION WARNING These safety warnings are provided to ensure the safety of person nel and proper operation of the instrument Do not attempt to perform any tests with this instrument until you have read the user manual Tests are to be carried out on de energized circuits only Never connect the unit to a live circuit When the unit is measuring resistance showing a high inductive component transformers motors etc after ending the measure ment the unit then discharges the inductive sample and the warning icon AN appears for the entire duration Never disconnect the connection wires before this icon disappears The micro ohmmeter should never be used in an explosive environment this includes poorly ventilated battery rooms and enclosures Make sure the internal battery is fully charged prior to testing If the
58. the small display and the five digit alpha value appears on the large display and then automatically returns to the top level of the metal set up menu To proceed to the next programming variable press the A button Programming the Alpha Value ALPH Turn the rotary switch to the SET UP position Press the A button until ALPH appears on the top line of the display Press the button to begin programming the alpha value See Table 2 in 84 6 for common alpha values The current alpha value will be displayed with the leading digit flashing Use the A button to change the leading digit When the desired value is reached press the button to move the next digit to the right Use the A button to change this digit then press the button to again move to the next digit to the right Repeat this process for each of the 5 digit locations After the 5th digit is programmed press the button again to return to the top level of the alpha set up menu To proceed to the next programming variable press the A button Selecting Temperature Units dEg Turn the rotary switch to the SET UP position Press the A button until dEg appears on the top line of the dis play Micro Ohmmeter Model 6250 4 2 12 Press the gt button to enter the degree units sub menu Use the A button to toggle through the choices of Fahrenheit dEgF or Centigrade dEgC Press the gt button to validate the selection and return to the t
59. tton dEL will appear on the lower line of the display Delete all data from memory by first pressing the gt button then toggling between Yes dEL Y or No dEL n Pressing the button while dEL Y is in the display will clear all memory of stored measurements e Pressing the button while dEL n is in the display will cancel the request i NOTE Only objects with data stored in them can be accessed To return to the beginning of the SET UP menu press the A button when nEn is on the top line of the display Micro Ohmmeter Model 6250 27 4 3 Operating Procedure WARNING Before performing the resistance test verify that the sample under test is not energized 4 3 1 Connections and Readings Clean all surfaces before connecting test leads Verify a solid connection between test leads and the sample Set the range selector switch to the desired range for the test If the anticipated resistance is not known begin with the highest range 25009 and successively lower the range selection until adequate resolution is achieved The START STOP button will need to be pressed each time you change ranges The range selection may be changed while the instrument is on A diagram of the measurement system is shown in Figure 4 2 The Model 6250 generates a current 1 from the internal voltage source V A voltmeter measures the voltage drop V at the Kelvin probe contact points to the resistance to be

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