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allsun EM127 User Manual

Digital automotive multimeter
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Digital Automotive Multimeter
Users Manual
Read this manual thoroughly before use
127

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Summary of Contents for allsun EM127

  • Page 1 Digital Automotive Multimeter Users Manual Read this manual thoroughly before use...

  • Page 2: Warranty

    WARRANTY This instrument is warranted to be free from defects in material and workmanship for a period of one year. Any instrument found defective within one year from the delivery date and returned to the factory with transportation charges prepaid, will be repaired, adjusted, or replaced at no charge to the original purchaser.
  • Page 3 7. Resistance 8. Frequency 9. Diode 10. Continuity 11. Temperature 12. Ignition system Warning To avoid possible electric shock or personal injury, follow these guidelines: 1. Do not use the meter if it is damaged. Before you use the meter, inspect the case. Pay particular attention to the insulation surrounding the connectors.
  • Page 4 8. When servicing the meter, use only specified replacement parts. 9. Use caution when working with voltage above 30V ac rms, 42V peak, or 60V dc. Such voltages pose a shock hazard. 10. When using the probes, keep your fingers behind the finger guards on the probes.
  • Page 5 Caution To avoid possible damage to the meter or to the equipment under test, follow these guidelines: 1. Disconnect circuit power and discharge all capacitors before testing resistance, diode, continuity and temperature. 2. Use the proper terminals, function and range for your measurements.
  • Page 6 STRUCTURE Figure 1 1. Display digit LCD, with a max. reading of 1999 2. " Low " LED / " HV " LED a. In ignition system test, this LED will flash if the spark plug wire is delivering spark. b.
  • Page 7 5. Power Switch Used to turn on or off the meter. 6. Function / Range Switch Used to select desired function and range as well as to turn on off the meter. 7. " 10A " Terminal Plug-in connector for the red test lead for current measurements.
  • Page 8 GENGRAL SPECIFICATION Fuse Protection for " 10A " Jack Inputs: 10A/250V Fast Fuse Display: 3 -digit LCD, with a max. reading of 1999 Overrange Indication: only figure " 1 " shown on the display Negative Polarity Indication: " - " displayed automatically Sampling Rate: about 2~3 times/sec Operating Environment: temperature: 0°C ~ 40°C relative humidity: <...

  • Page 9: Specifications

    SPECIFICATIONS Accuracy is specified for a period of one year after calibration and at 18°C to 28°C, with relative humidity < 75%. Accuracy specifications take the form of: ± ([% of Reading]+[number of Least Significant Digits]) DC Voltage Range Resolution Accuracy 0.01V ±...

  • Page 10: Duty Cycle

    Resistance Range Resolution Accuracy ± (1.2%+5) 0.001k 0.01k ± (1.0%+5) 200k 0.1k 0.01M ± (1.5%+5) Frequency Range Resolution Accuracy 20kHz 0.01kHz ± (1.5%+5) Measurement Range: 1Vp ~ 35Vp Duty Cycle Range Resolution Accuracy 5% ~ 95% 0.1% ± (2.5%+5) Measurement Range: 6Vp ~ 35Vp Frequency Range: 40Hz ~ 1kHz...
  • Page 11 Diode and Continuity Range Description Test Condition The approx. forward Open Circuit Voltage: voltage drop of the about 2.8V diode will be displayed. The built-in buzzer will Open Circuit Voltage: sound if the resistance about 2.8V is less than about 30 . Temperature Range Resolution...
  • Page 12 Battery Range Resolution Description If the battery is low, the "Low" LED will light. If the battery is 0.01V normal, the "Normal" LED will light. If the battery is high, the "High" LED will light. The display will show the approx. 0.1V voltage at the same time.

  • Page 13: Dwell Angle

    Dwell Angle Number of Range Resolution Accuracy Cylinders 3 cylinders 0 ~ 120 ° 4 cylinders 0 ~ 90 ° 5 cylinders 0 ~ 72 ° ° ± (2.5%+5) 6 cylinders 0 ~ 60 ° 8 cylinders 0 ~ 45 °...

  • Page 14: Measuring Dc Voltage

    Measuring DC Voltage Figure 2 1. Connect the black test lead to the " COM " jack and the red test lead to the " INPUT " jack. 2. Set the range switch to desired range. 3. Connect the test leads across the circuit or source to be measured.

  • Page 15: Measuring Dc Current

    Measuring DC Current Figure 3 1. Connect the black test lead to the " COM " jack and the red test lead to the " 10A " jack. 2. Set the range switch to position. 3. Turn off power to the circuit which you want to measure. Discharge all capacitors.

  • Page 16: Measuring Resistance

    2. Don't use the meter to measure a current higher than 10A. 3. Never place the probes in parallel with a circuit or component when the test leads are plugged into the current terminals. Measuring Resistance Figure 4 1. Connect the black test lead to the " COM " jack and the red test lead to the "...

  • Page 17: Continuity Test

    seconds to stabilize reading. This is normal for high resistance measurements. 2. When the input is not connected, i.e. at open circuit, "1" will be displayed as overrange indication. 3. To avoid electric shock to you or damage to the meter, disconnect circuit power and discharge all capacitors before measuring resistance.

  • Page 18: Measuring Frequency

    3. Connect the test leads to the circuit to be measured. 4. If the resistance is less than about 30 , the built-in buzzer will sound. Note: To avoid electric shock to you or damage to the meter, disconnect circuit power and discharge all capacitors before test.

  • Page 19: Diode Test

    3. Connect the test leads across the source or load to be measured. 4. Read the reading on the display. Note: The input voltage should be between 1Vp and 35Vp. If the voltage exceeds 35Vp, the accuracy of reading may be out of the specified accuracy range.

  • Page 20: Measuring Duty Cycle

    2. Set the range switch to position. 3. Connect the red test lead to the anode of the diode to be tested and the black test lead to the cathode of the diode. 4. The display shows the approximate forward voltage drop of the diode.

  • Page 21: Measuring Temperature

    negative terminal of the signal source. 4. Read the reading on the display. Note: 1. The input voltage must be between 6Vp and 35Vp. If the voltage is too low, it will be impossible to perform measurement. If the voltage exceeds 35Vp, the accuracy of reading may be out of the specified accuracy range.
  • Page 22 Figure 9 K Type thermocouple Object 1. Connect the negative " " plug of the K type thermocouple to the " COM " jack and the positive " " plug of the K type thermocouple to the " INPUT " jack. °C 2.
  • Page 23 Measuring Dwell Angle Ignition Coil Figure 10 Ground 1. Connect the black test lead to the " COM " jack and the red test lead to the " INPUT " jack. ( Note: The polarity of the red lead is positive " ".
  • Page 24 Note: 1. The input voltage must be between 6Vp and 35Vp. If the voltage is too low, it will be impossible to perform measurement. 2. The stability of reading will decrease if the rotation speed of the engine is too low. 3.
  • Page 25 1. Connect the black test lead to the " COM " jack and the red test lead to the " INPUT " jack. ( Note:The polarity of the red lead is positive " ". ) 2. Set the range switch to desired TACH position according to the cylinder number of the engine to be measured.

  • Page 26: Battery Test

    Battery Test BAT. Figure 12 1. Connect the black test lead to the " COM " jack and the red test lead to the " INPUT " jack. 2. Set the range switch to desired BAT. position according to the rated voltage of the battery to be tested. 3.

  • Page 27: Testing Ignition System

    If the " Normal " LED lights, the battery is normal. If the " High " LED lights, the battery is high. Note: 1. To avoid damage to the meter, do not test a battery whose rated voltage is high than 24V. 2.

  • Page 28: Automatic Power Off

    1. Connect the red test lead to the " INPUT " jack. 2. Set the range switch to HV position. 3. Make sure that the engine is running, then place the steel probe of the test lead on cylinder 1's insulated spark plug wire.

  • Page 29: General Maintenance

    General Maintenance Periodically wipe the case with a damp cloth and mild detergent. Do not use abrasives or solvents. Dirt or moisture in the terminals can affect readings. Clean the terminals as follows: 1. Turn off the meter and remove the test leads from the meter. 2.
  • Page 30 This meter uses one fuse: 10A, 250V, Fast, Ø5X20mm To replace the fuse, remove the holster from the meter, then open the battery cover. Remove the battery and the screw on the bottom of the battery compartment, and remove the screws on the back cover.
  • Page 31 DISPOSAL OF THIS ARTICLE Dear Customer, If you at some point intend to dispose of this article, then please keep in mind that many of its components consist of valuable materials, which can be recycled. Please do not discharge it in the garbage bin, but check with your local council for recycling facilities in your area.

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