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Martindale Electric MM68 Instruction Manual

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MM68
MULTIMETER
I
nstructIon
M
anual

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Summary of Contents for Martindale Electric MM68

  • Page 1 MM68 MULTIMETER nstructIon anual...
  • Page 2 GENERAL SAFETY INFORMATION: Always read before proceeding. Warning These instructions contain both information and warnings that are necessary for the safe operation and maintenance of this product. It is recommended that you read the instructions carefully and ensure that the contents are fully understood. Failure to understand and to comply with the warnings and instructions can result in serious injury, damage or even death.

  • Page 3: Table Of Contents

    Thank you for buying one of our products. For safety and full understanding of its benefits please read this manual before use. Technical support is available from 01923 441717 and support@martindale-electric.co.uk. CONTENTS Introduction Inspection Description Accessories Battery Installation Product Specific Safety Information Precautions Operation General...

  • Page 4: Introduction

    If there is any damage then consult your distributor immediately. 1.2 Description The MM68 is a 4½ digit multimeter with the following measurement functions: True rms AC voltage to 750V DC voltage to 1000V...

  • Page 5: Battery Installation

    1.4 Battery Installation Refer to section 4.1 (Battery Replacement) for the battery installation instructions for the MM68.

  • Page 6: Product Specific Safety Information

    2. PRODUCT SPECIFIC SAFETY INFORMATION Measurement Category II (CAT II) is applicable to test and measuring equipment connected directly to utilization points (socket outlets and similar points) of the low-voltage MAINS installation. Measurement Category III (CAT III) is applicable to test and measuring equipment connected to the distribution part of the building’s low-voltage MAINS installation.
  • Page 7 Likewise, if test lead accessories such as crocodile clips are also used, the measurement category will be the lowest measurement category in that combination. Warning Always test this unit on an appropriate proving device or known voltage source before and after using it to determine if a hazardous voltage exists in a circuit to be tested.

  • Page 8: Operation

    3. OPERATION 3.1 General If the multimeter does not measure capacitance or current on the A/mA ranges, the internal fuse (F1) may have blown (see section μ 4.2 Fuse Replacement). If the multimeter does not measure current on the 10A the internal fuse (F2) may have blown (see section 4.2 Fuse Replacement).

  • Page 9: Description Of Press Buttons

    μF, mF, Ω Ω , Hz, kHz Ω Indicates battery is low Indicates DC measurement Indicates AC measurement 3.6 Auto Power Off The MM68 will auto power off after approximately 30 minutes. Pressing any button will turn the MM68 back on.

  • Page 10: Max/Min

    To deactivate the auto power off function press and hold the RANGE button while simultaneously turning the MM68 function switch from OFF to any position. The APO annunciator will no longer be displayed. 3.7 Max/Min To select the Max/Min function press the MAX/MIN button.

  • Page 11: Ac & Dc Voltage Measurement

    To return to autoranging hold the RANGE button for 2 seconds. 3.11 AC & DC Voltage Measurement Connect the black test lead to the COM terminal and the red test lead to the %HzV terminal. Ω Set the rotary switch to either AC mV/V or DC mV/V and if required manually set the range.

  • Page 12: Capacitance Measurement

    3.14 Capacitance Measurement Be sure the capacitor being tested is completely discharged before connecting the test leads. Connect the black test lead to the COM terminal and the red test lead to the terminal. Set the rotary switch to and if required manually set the range.

  • Page 13: Continuity Testing

    Taking all necessary safety precautions connect the test leads to the circuit being measured and read the measured % duty cycle from the display. 3.17 Continuity Testing Connect the black test lead to the COM terminal and the red test lead to the %HzV terminal.

  • Page 14: Maintenance

    4. MAINTENANCE 4.1 Battery Replacement To avoid shock or injury, disconnect the multimeter from any external circuits or components and remove the test leads before proceeding. Replace the battery by removing the two screws from the battery cover and lifting the battery cover. Fit a new 9V, NEDA 1604, JIS006P, IEC 6F22 battery and replace the battery cover and screws.

  • Page 15: Calibration

    4.6 Repair & Service There are no user serviceable parts in this unit other than those that may be described in section 3. Return to Martindale Electric if faulty. Our service department will quote promptly to repair any fault that occurs outside the guarantee period.

  • Page 16: Warranty

    5. WARRANTY AND LIMITATION OF LIABILITY This Martindale product is warranted to be free from defects in material and workmanship under normal use and service. The warranty period is 2 years and begins on the date of receipt by the end user.
  • Page 17 decision-maker of competent jurisdiction, such holding will not affect the validity or enforceability of any other provision or other part of that provision. Nothing in this statement reduces your statutory rights.

  • Page 18: Specifications

    Specification MM68 Digital Multimeter ELECTRICAL All specified accuracies are at 23°C ± 5°C, <75% RH for 1 year. Temperature Coefficient: 0.1 x (specified accuracy) per °C. (0°C to 18°C, 28°C to 50°C) DC VOLTS Ranges: 220mV, 2.2V, 22V, 220V, 1000V Resolution: 0.01mV, 0.0001V, 0.001V, 0.01V,...
  • Page 19 Specification MM68 Digital Multimeter DC CURRENT Ranges: 220μA, 2200μA, 22mA, 220mA, 10A * Resolution: 0.01μA, 0.1μA, 0.001mA, 0.01mA, 0.001A Accuracy: 220μA to 22mA ranges ± (0.5% of rdg + 10 dgts) 220mA range ± (1.0% of rdg + 10 dgts) 10A range ±...
  • Page 20 Specification MM68 Digital Multimeter Open circuit voltage: -0.45 V DC (-1.2 V DC on 220Ω range) Overload protection: 500 V DC or AC rms CAPACITANCE Ranges: 22nF, 220nF, 2.2μF, 22μF, 220μF, 2.2mF, 22mF Resolution: 0.001nF, 0.01nF, 0.0001μF, 0.001μF, 0.01μF, 0.0001mF, 0.001mF Accuracy: 22nF range ±...
  • Page 21 Specification MM68 Digital Multimeter CONTINUITY Audible indication: < 30Ω Response time: 500ms Overload protection: 500V DC or AC rms DIODE TEST Test current: 1.2mA approx Resolution: 0.1mV Accuracy: ± (2.0% rdg + 5 dgts) Audible indication: <0.25V Open circuit voltage: 3.0V DC typical...
  • Page 22 Specification MM68 Digital Multimeter Dimensions: 165mm (H) x 78mm (W) x 42.5mm (D) Weight: Approx. 285g Includes: TL16 test leads, 1 x spare fuse, 9V battery (installed) and instructions SAFETY: Conforms to BS EN 61010-1, CAT III 600 V, CAT II 1000V...
  • Page 23 USER NOTES...
  • Page 24 Martindale Electric Company Limited Metrohm House, Imperial Park, Imperial Way, Watford WD24 4PP, UK Tel: +44(0)1923 441717 Fax: +44 (0)1923 446900 E-mail: sales@martindale-electric.co.uk Website: www.martindale-electric.co.uk © 2012 Martindale Electric Company Ltd. Registered in England No. 3387451. E. & O.E. Document V2 LITMM68...

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