Chauvin Arnoux AEMC 6255 User Manual
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Chauvin Arnoux AEMC 6255 User Manual

Chauvin Arnoux AEMC 6255 User Manual

Micro-ohmmeter
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6255
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MICRO-OHMMETER
ENGLISH
User Manual

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Summary of Contents for Chauvin Arnoux AEMC 6255

  • Page 1 6255 ■ MICRO-OHMMETER ENGLISH User Manual...

  • Page 2: Statement Of Compliance

    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.

  • Page 3: Table Of Contents

    CONTENTS 1. INTRODUCTION .................... 4 1.1. Precautions ..................4 1.2. Battery Handling .................. 5 1.3. Definition of Measurement Categories (CAT) ........5 1.4. Receiving Your Shipment ..............6 1.5. Ordering Information ................6 2. FEATURES ....................7 2.1. Description ..................7 2.2.

  • Page 4: Introduction

    1. INTRODUCTION Thank you for purchasing the AEMC Micro-Ohmmeter Model 6255. For best results from your instrument and for your safety, read the enclosed operating instructions carefully and comply with the precautions for use. These products must be only used by qualified and trained users. WARNING, risk of DANGER! The operator must refer to these instructions whenever this danger symbol appears.

  • Page 5: Battery Handling

    1.2. Battery Handling 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.

  • Page 6: Receiving Your Shipment

    1.4. 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 equipment appears to be damaged, file a claim immediately with the carrier and notify your distributor at once, giving a detailed description of any damage.

  • Page 7: Features

    2. FEATURES 2.1. Description The Micro-ohmmeter Model 6255 performs low resistance measurements from 1μΩ to 2500Ω. This easy-to-use instrument measures all inductive or non-inductive resistances with test currents (continuous or pulsed) from 1mA to 10A. A built-in thermal switch protects the micro-ohmmeter against overheating on the 10A range when in continuous use.

  • Page 8: Key Features

    2.3. Key Features  Measures from 1µΩ 2500Ω  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 ...

  • Page 9: Control Features

    2.4. Control Features Figure 2-1 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 Eight program / function buttons Micro-Ohmmeter Model 6255...

  • Page 10: Button Functions

    2.5. Button Functions In SET-UP mode, selects a function or increments a flashing parameter. 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) In SET-UP mode, shifts the decimal point and selects the unit.

  • Page 11: Display Symbols

    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 described below. Figure 2-2 Buzzer ON.
  • Page 12 Memory utilization indicator mΩ Units of measure Resistive material test mode selected 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.

  • Page 13: Specifications

    3. SPECIFICATIONS 3.1. Electrical Specifications are given for an ambient temperature of 73°F ± 9°F (23°C ± 5°), relative humidity of 45 to 75% and a supply voltage of 6V ± 0.1V. All specifications are subject to change without notice. Measurement Method: 4-Wire Kelvin resistance measurement with compensation for stray/residual voltages.

  • Page 14: Mechanical

    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" (6.3 x 32mm), fast acting, 16A/250V current source protection F2 - 3/4 x 3/16" (5 x 20mm), fast acting, 2A/250V charging circuit protection 3.2.

  • Page 15: Operation

    4. OPERATION Fully charge the instrument battery 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 (§ 4.3) and instrument configuration section (§...
  • Page 16 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 stop automatically.

  • Page 17: Instrument Configuration (Set-Up Mode)

    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 set up mode. r5 – OFF – Trig – PC – uT100 – Print buzz –...
  • Page 18 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 programmed to any of five communication methods. These consist of:  Off: Disable input and output functions of the interface port. This saves battery power.
  • Page 19 4.2.3. Setting the Buzzer Level (bUZZ) Turn the rotary switch to the SET-UP position. Press the ▲ button until “bUZZ” appears on the top line of the display. Press the ► button to scroll through the choices of OFF (no icon displayed), LOW (small buzzer icon displayed) or HIGH (large buzzer icon...
  • Page 20 4.2.6. Setting the Language used for Printing Reports (LAnG) Turn the rotary switch to the SET-UP position. Press the ▲ button until “LAnG” appears on the top line of the display. Press the ► button to enter the language selection sub-menu. Next, press the ▲...
  • Page 21 4.2.8. Selecting Method and Value for Ambient Temperature (tAnb) Turn the rotary switch to the SET-UP position. Press the ▲ button until “tAnb” appears on the top line of the display. Press the ► 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 reference...
  • Page 22 4.2.9. Selecting the Metal Type (nEtA) Turn the rotary switch to the SET-UP position. Press the ▲ 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.
  • Page 23 4.2.12. Setting Alarm Set Point, Direction and Buzzer Level (ALAr) Turn the rotary switch to the SET-UP position. Press the ▲ button until “ALAr” appears on the top line of the display. Press the ► button, Alarm 1 and its set point, direction and buzzer level will appear with ALARM 1 flashing.
  • Page 24 4.2.13. 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. Turn the rotary switch to the SET-UP position.
  • Page 25 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 ► button while “dEL. n” is in the display will cancel the request.

  • Page 26: Operating Procedure

    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.
  • Page 27 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.

  • Page 28: Selecting The Test Range

    4.3.5. Stand-by (ST BY) State This is the position that the Model 6255 returns to at the end of a measurement cycle after:  the operator presses the START/STOP button during a test  any changes to the position of the rotary switch ...

  • Page 29: Measurement Modes

    4.5. Measurement Modes For descriptions of all Fault Indicator (Error) codes, refer to § Troubleshooting. 4.5.1. Measurement Safety Warnings WARNINGS: 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.
  • Page 30 After ending the measurement, with the current turned off, the Model 6255 will discharge the device under test as long as the test leads are connected to the device. 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.
  • Page 31 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).
  • Page 32 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. #2118.77 or Cat. #2118.78) listed in the Accessories section is recommended for this mode.

  • Page 33: Ambient Temperature Compensation

    4.6. Ambient Temperature Compensation The metals used in the windings of certain devices (for example, the copper wire used in transformer or motor windings) have high temperature coefficients 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.
  • Page 34 Material Element/Alloy “alpha” per °C x 10 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...
  • Page 35 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. Figure 4-9 Place the temperature sensor in contact with the specimen or in close proximity to it.

  • Page 36: Activating Alarms

    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 (§4.2.7) and Selecting the Method for Ambient Temperature (§4.2.8). Select the range and the measurement mode. Press the R ( ) button.

  • Page 37: Memory/Printing

    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 (measurements). The maximum number of measurements that can be stored is approximately 1500.

  • Page 38: Displaying And Printing Stored Measurements

    5.2. Displaying and Printing Stored Measurements To display or print a measurement result stored in memory, press the yellow 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.
  • Page 39 Measurement data stored in memory can be accessed directly from any switch position except OFF and SET-UP for printing.  Press the yellow button followed by the PRINT MEM button to access measurement results stored in memory for printing. An optional serial printer is required for this feature.

  • Page 40: Cables And Printers Used With The Interface Port

    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 illustrated in Figure 5-2. The “READY” LED indicates that a measurement can be made. Figure 5-2 The DB9 interface port can be used for RS-232 communication with a PC, terminal or a printer.
  • Page 41 Direct Printer Connection: Male Connector Female Connector Printer end Printer end Figure 5-4 Micro-Ohmmeter Model 6255...

  • Page 42: Dataview

    6. DATAVIEW DataView software with the Micro-Ohmmeter Control Panel (provided free with the product in North America, South America, and Australia) allows you to:  Connect the instrument to a computer  Configure and schedule a recording session on the instrument ...

  • Page 43: Troubleshooting

    7. TROUBLESHOOTING The Model 6255 incorporates internal diagnostics and will inform the operator of any condition needing attention through the use of error messages. The available messages are described here. 7.1. Fault Indicators Err 1 Low battery level Err 2 Internal problem Err 3 Unable to measure battery...

  • Page 44: Application Examples

    8. APPLICATION EXAMPLES The proper procedures for using the Model 6255 in some specific applications are described in this section. 8.1. Measuring Winding Resistance of Motors and Transformers WARNINGS: Prior to and after testing a transformer winding, the energy stored in the magnetic field must be dissipated by shorting the transformer terminals.

  • Page 45: Measuring Resistance On Electric Motors

    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. Figure 8-2 8.3. Battery Strap Measurements Proper battery strap resistance measurements will help ensure proper voltage output.

  • Page 46: Maintenance

    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 repair center. 9.1. Warning  To avoid electrical shock, do not attempt to perform any servicing unless you are qualified to do so.

  • Page 47: Charging Indicators

    Connect the Model 6255 to 120V using the power cord provided (charging starts automatically). Testing cannot be conducted while charging the batteries. Button presses are ignored when charging is in process. CHARGING INDICATORS Charg L: instrument is "trickle charging."  bAt CHrg with flashing: instrument in "fast charge"...

  • Page 48: Repair And Calibration

    For North / Central / South America, Australia and New Zealand ® ® 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.

  • Page 49: Limited Warranty

    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.
  • Page 50 NOTES Micro-Ohmmeter Model 6255...
  • Page 51 NOTES Micro-Ohmmeter Model 6255...
  • Page 52 09/20 99-MAN 100458 v7 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 Micro-Ohmmeter Model 6255...

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