UNI-T UT105 Operating Manual
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UNI-T UT105 Operating Manual

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Model UT105: OPERATING MANUAL
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  • Page 1: Table Of Contents

    Model UT105: OPERATING MANUAL Table of Contents Title Page Overview Unpacking Inspection Safety Information Rules For Safe Operation Automotive Servicing Safety Guide International Electrical Symbols The Meter Structure Rotary Switch Functional Buttons Display Symbols Measurement Operation Part 1 Multimeter Basic Testing A.

  • Page 2: Title Page

    Model UT105: OPERATING MANUAL Title Page H. Charging System Voltage Testing Ignition System Testing 1. Ignition Coil Testing 2. Ignition System High Voltage Damper Testing 3. Hall Switch/Sensor Testing 4. Magnetic Resistance Sensor 5. RPMx10 Testing 6. Fuel System Testing Engine Sensor Testing 1.

  • Page 3: Overview

    To avoid electric shock or personal injury, read the “Safety Information” and “Rules for Safe Operation” carefully before using the Meter. In 1999 counts and 3-1/2 digits, the UT105 Meter is a manual testing automotive digital Multimeter. Spotting a unique design with an extra large screen, this meter...

  • Page 4: Unpacking Inspection

    Model UT105: OPERATING MANUAL Unpacking Inspection Open the package case and take out the Meter. Check the following items carefully to see any missing or damaged part: Item Description 1 piece English Operating Manual 1 pair Test Lead Alligator Clip...

  • Page 5: Safety Information

    Model UT105: OPERATING MANUAL Safety Information This Meter complies with standards IEC61010: in pollution degree 2, overvoltage category (CAT. II 1000V, CAT. III 600V) and double insulation. CAT.II: Local level, appliance, PORTABLE EQUIPMENT etc., with smaller transient overvoltages than CAT. III CAT.III: Distribution level, fixed installation, with smaller...

  • Page 6: Rules For Safe Operation

    Model UT105: OPERATING MANUAL Rules For Safe Operation (1) Warning To avoid possible electric shock or personal injury, and to avoid possible damage to the Meter or to the equipment under test, adhere to the following rules: Before using the Meter inspect the case. Do not use the Meter if it is damaged or the case (or part of the case) is removed.
  • Page 7 Model UT105: OPERATING MANUAL Rules For Safe Operation (2)
  • Page 8 Model UT105: OPERATING MANUAL...

  • Page 9: Automotive Servicing Safety Guide

    Model UT105: OPERATING MANUAL Automotive Servicing Safety Guide(2) l To connect or cut off an electronic component, close the ignition lock. l Pay attention to the automotive producer’s cautions, notes and servicing procedures. All the information, explanations and detailed descriptions in the operation manual have originated from the industrial information recently published.
  • Page 10 Model UT105: OPERATING MANUAL Automotive Servicing Safety Guide(3) 5. Check the ignition lead: any breakage of any terminal, crack on any spark plug or breakage at the insulation of the ignition lead. 6. Check all the vacuum hoses: any right line, shrinkage, bend, crack, fracture or damage.

  • Page 11: International Electrical Symbols

    Model UT105: OPERATING MANUAL International Electrical Symbols AC (Alternating Current). Grounding. Double Insulated. Deficiency of Built-In Battery. Fuse. Warning. Refer to the Operating Manual. Conforms to Standards of European Union.

  • Page 12: The Meter Structure

    Model UT105: OPERATING MANUAL The Meter Structure (see figure 1) (figure 1) LCD display Data Hold button Rotary Switch Input Terminals Power button...

  • Page 13: Rotary Switch

    Model UT105: OPERATING MANUAL Rotary Switch Below table indicated for information about the rotary switch positions. Rotary Function Switch Position DC voltage measurement. AC voltage measurement. DC Current Measurement Diode test. Continuity test. Resistance measurement. DWELL Automotive ignition dwell testing, Unit: degree...

  • Page 14: Functional Buttons

    Model UT105: OPERATING MANUAL Functional Buttons Below table indicated for information about the functional button operations. voltage measurement. Turn the power on and off. HOLD l Press HOLD once to enter hold mode. l Press HOLD again to exit hold mode and the present value is shown.

  • Page 15: Display Symbols

    Model UT105: OPERATING MANUAL Display Symbols (see figure 2) ( figure 2) Symbol Meaning The battery is low. Warning: To avoid false readings, which could lead to possible electric shock or personal injury, replace the battery as soon as the battery indicator appears.
  • Page 16 Model UT105: OPERATING MANUAL Display Symbols(2) (see figure 2) Symbol Meaning Ohm. The unit of resistance. ,k ,M kilohm.1 x 10 or 1000 ohms. Megaohm. 1 x 10 1,000,000 ohms. Volts. The unit of voltage. mV, V mV: Millivolt. 1 x 10 or 0.001 volts.

  • Page 17: Measurement Operation

    Model UT105: OPERATING MANUAL Measurement Operation(1) Part 1 Multimeter Basic Testing A.AC or DC Voltage Testing (see figure 3) (figure 3) Warning To avoid harms to you or damages to the Meter from electric shock, please do not attempt to measure voltages higher than 1000Vp although readings may be obtained.

  • Page 18: Dc Current Testing

    Model UT105: OPERATING MANUAL Measurement Operation(2) Note l If the value of voltage to be measured is unknown, use the maximum measurement position (1000V) and reduce the range step by step until a satisfactory reading is obtained. l The LCD displays “1” indicating the existing selected range is overloaded, it is required to select a higher range in order to obtain a correct reading.
  • Page 19 Model UT105: OPERATING MANUAL Measurement Operation(3) may be damaged or the operator himself may be hurt. Use proper terminals, function, and range for the measurement. When the testing leads are connected to the current terminals, do not parallel them across any circuit.

  • Page 20: Resistance Testing

    Model UT105: OPERATING MANUAL Measurement Operation(4) C.Resistance Testing (see figure 5) (figure 5) Warning To avoid damages to the Meter or to the devices under test, disconnect circuit power and discharge all the high-voltage capacitors before measuring resistance. Never attempt an in-circuit current measurement where the open circuit voltage between terminals and ground is greater than 60V DC or 30V AC rms.

  • Page 21: Diode Testing

    Model UT105: OPERATING MANUAL Measurement Operation(5) Note l The test leads can add 0.1 to 0.2 of error to the resistance measurement. To obtain precision readings in low-resistance, that is the range of 200 , short-circuit the input terminals beforehand and record the reading obtained (called this reading as X).
  • Page 22 Model UT105: OPERATING MANUAL Measurement Operation(6) Warning To avoid possible damage to the Meter and to the device under test, disconnect circuit power and discharge all high-voltage capacitors before testing diodes and continuity. Never attempt an in-circuit current measurement where the open circuit voltage between terminals and ground is greater than 60V DC or 30V AC rms.

  • Page 23: Continuity Testing

    Model UT105: OPERATING MANUAL Measurement Operation(7) l The LCD will display 1 indicating open-circuit for wrong connection. l The unit of diode is Volt (V), displaying the positive- connection voltage-drop value. l When diode testing has been completed, disconnect the connection between the testing leads and the circuit under test.

  • Page 24: Dwell Testing

    Model UT105: OPERATING MANUAL Measurement Operation(8) F.Dwell Testing (see figure 7) It was very important in the past to test the dwell of the cut-off switch of an ignition system. The dwell testing means the duration when the cut-off switch remains off when the cam is turning.

  • Page 25: Engine Tach (Rotation Speed) Testing "Rpmx10

    Model UT105: OPERATING MANUAL Measurement Operation(9) If the GM feedback carburetor is tested, connect the red probe to the ground terminal or the computer drive of the solenoid. (Refer to the automotive servicing manual for the specific position.) If the dwell of an arbitrary ON/OFF equipment is tested, connect the red probe to the end of the equipment, fixed with an ON/OFF switch.

  • Page 26: Data Holding

    Model UT105: OPERATING MANUAL Measurement Operation(10) If a DIS ignition system without any distributor board is used in the automobile, connect the red test lead probe to the TACH (tachometer) signal line (which is connected to the computer DIS module of the automotive engine). Refer to the automotive servicing manual for the specific position.

  • Page 27: Part 2 Diagnosis Of Automotive Troubles

    Model UT105: OPERATING MANUAL Measurement Operation(11) Part 2 Diagnosis of Automotive Troubles The digital multimeter is a tool for the very effective diagnosis of the troubles with the electronic systems of the automobile. This part gives a special introduction as...

  • Page 28: Solenoid Or Relay Testing

    Model UT105: OPERATING MANUAL Measurement Operation(12) C.Solenoid or Relay Testing 1. The same as in Items 1 to 3 (Fuse Testing). 2. Connect the red and black test lead probes in parallel to the two end of a solenoid or relay. The impedance of most of solenoids or relay coils is less than 200 .

  • Page 29: Battery Power Consumption Testing When The Engine Is Off

    Model UT105: OPERATING MANUAL Measurement Operation(13) (2) As prompted at the LCD connect terminal, insert the red test lead into the V terminal and the black one into the COM terminal. (3) Turn off the ignition switch. (4) Turn on the driving lights for 10 sec. to release charges from the battery.

  • Page 31: Voltage Drop Testing

    Model UT105: OPERATING MANUAL Measurement Operation(15) Voltage Temperature 9.6 V or more 21.1 C (70 9.5 V 15.6 C (60 9.4 V 10.0 C (50 9.3 V C (40 9.1V -1.1 C (30 8.9 V -6.7 C (20 8.7 V -12.2...
  • Page 32 Model UT105: OPERATING MANUAL Measurement Operation(16) 2.Set the rotary switch of the multimeter to the 200mV or 2VDC. As prompted at the LCD connect terminal, insert the red test lead into the V terminal and the black one into the COM terminal.

  • Page 33: Charging System Voltage Testing

    Model UT105: OPERATING MANUAL Measurement Operation(17) H.Charging System Voltage Testing This testing is used to see if the charging system operates normally so as to provide the electronic systems with adequate power (lamps, electric fans, radio sets, etc.). 1. Set the rotary switch of the multimeter to the 20VDC...

  • Page 34: Ignition System Testing

    Model UT105: OPERATING MANUAL Measurement Operation(18) I.Ignition System Testing 1.Ignition Coil Testing (1) Before the operation, cool the engine and cut off the ignition coil. (2) Set the rotary switch of the meter to the 200 . As prompted at the LCD connect terminal, insert the red...

  • Page 35: 2. Ignition System High-Voltage Damper Testing

    Model UT105: OPERATING MANUAL Measurement Operation(19) (5) Set the rotary switch to the 200k and test the secondary coil of the ignition coil. (6) Connect the red test lead probe to the secondary outlet and the black one to the primary “-” pole. Refer to various kinds of automotive manuals for the details.

  • Page 36: Hall Switch/Sensor Testing

    Model UT105: OPERATING MANUAL Measurement Operation(20) Warning: l Some of Chrysler’s products use a spark plug high voltage damper with “positive lock” end electrodes, which can only be moved out of the distributor board. If it is moved out of anywhere else, some damage will result.

  • Page 37: Magnetic Resistance Sensor

    Model UT105: OPERATING MANUAL Measurement Operation(21) (1) Move the Hall sensor out of the automobile and see the details of the operation in various kinds of automotive manuals. (2) Connect the positive pole of the 9 V battery to the...

  • Page 38: Rpmx10 Testing

    Model UT105: OPERATING MANUAL Measurement Operation(22) The functions of a magnetic resistance sensor is similar to those of a Hall sensor and the testing methods of both sensors are also similar. Their normal resistance is generally in a range of 150 to 1 k .

  • Page 39: Fuel System Testing

    Model UT105: OPERATING MANUAL Measurement Operation(23) (4) The normal starting rotation speed of an engine is about 50 RPM to 275 RPM. Refer the detailed position to the servicing handbooks of various kinds of automotive manuals because this value relates to the current temperature, engine size, battery size, etc.

  • Page 40: Engine Sensor Testing

    Model UT105: OPERATING MANUAL Measurement Operation(24) (2)Fuel Injector Resistance Testing (see figure 15) The testing method is similar to that of the resistance of an ignition coil. A. Cut the electric link off the injector.(Refer to the servicing handbooks of various kinds of automotive manuals for the detailed position.)

  • Page 41: Oxygen Sensor

    Model UT105: OPERATING MANUAL Measurement Operation(25) To be adapted to the provisions for low injection and fuel saving in the early period of the eighties, the computer- controlled regulators were installed in the automobile and the sensors provided the computer with some data required.
  • Page 42 Model UT105: OPERATING MANUAL Measurement Operation(26) (4) Connect the red test lead probe of the meter to the signal terminal (i.e. hot end) of the sensor. If the sensor has more than 3 leads, what is used in the automobile is a heat oxygen sensor, which has 2 hot ends.

  • Page 43: Temperature Sensor

    Model UT105: OPERATING MANUAL Measurement Operation(27) 2.Temperature sensor (see figure 17) The temperature sensor changes the output resistance through the changes in peripheral temperatures. The hotter the sensor is, the lower the resistance becomes. The temperature sensor is generally used in engine braking, air ventilation, flow, fuel temperature and other equipment.

  • Page 44: Position Sensor

    Model UT105: OPERATING MANUAL Measurement Operation(28) 3.Position Sensor (see figure 18) The position sensor is an electrometer or variable resistance. It is used for the computer monitoring of the position and direction of a mechanical device. The typical position sensors include throttle, exhaust recirculating EGR, blade air flow and other sensors.

  • Page 45: Absolute Pressure (Map) And Baro Sensor

    Model UT105: OPERATING MANUAL Measurement Operation(29) 4.Absolute Pressure (MAP) and Baro Sensor (see figure 19) The MAP sensor is used to change a pressure signal into a DC voltage or frequency one. All GM, Chrysler, Honda and Toyota use DC voltage type MAP sensors, while Ford uses frequency type MAP sensors.
  • Page 46 Model UT105: OPERATING MANUAL Measurement Operation(30) (3) Taking 4 cylinders (4CYL) for example, connect the black test lead probe of the meter to the ground terminal (i.e. ground strap connection) and connect the red one as illustrated in figure 20.

  • Page 47: Mass Air Flow (Maf) Sensor

    5.Mass Air Flow (MAF) Sensor (see figure 20) The sensor converts the air flow into a DC voltage, low frequency or high frequency signal. UT105 can only be used to test a DC voltage or low frequency signal. Testing Procedure:...
  • Page 48 Model UT105: OPERATING MANUAL Measurement Operation(32) Displayed Values: DC Voltage Type Sensor: The displayed value should be less than or equal to 1V. (The details shall be based on the parameters furnished by the supplier.) Frequency Type Sensor: In a vacuum state, the displayed value should be 330 RPM 5%.

  • Page 49: General Specifications

    Model UT105: OPERATING MANUAL General Specifications l Maximum Voltage between any Terminals and grounding: Refer to different range input protection voltage. Fuse Protection of mA terminal : CE Version: 315mA, 250V, fast type, 5x20mm Fuse Protection of 10A terminal : CE Version: 10A, 250V, fast...

  • Page 50: Accurate Specifications

    Model UT105: OPERATING MANUAL Accurate Specifications(1) Accuracy: (a% Reading + Digits), guarantee for 1 year. Operating Temperature: 18 C to 28 Relative Humidity: No more than 75% RH. A.DC Voltage Accuracy Overload Protection Range Resolution 230VAC 200mV 0.1mV (0.5%+5) 1000 VDC or 750...

  • Page 51: Resistance

    Model UT105: OPERATING MANUAL Accurate Specifications(2) D.Resistance Overload Accuracy Range Resolution Protection (0.8%+5) 600Vp 200k (1.5%+5) E.Diode Range Resolution Overload Protection 600Vp Remarks: l Open circuit voltage approximate 2.7V l The silicon PN junction normal voltage is about 500 mV to 800 mV F.Continuity Testing...

  • Page 52: Dwell Testing

    Model UT105: OPERATING MANUAL Accurate Specifications(3) G.Dwell Testing Range Resolution Overload Protection Accuracy 4CYL 600 V P 6CYL (3%+5) 8CYL Remark: Input Amplitude: More than or equal to 10 V in direct impulse; more than or equal to 0.5 mS in width.

  • Page 53: Maintenance

    Model UT105: OPERATING MANUAL Maintenance(1) This section provides basic maintenance information including battery and fuse replacement instruction. Warning Do not attempt to repair or service your Meter unless you are qualified to do so and have the relevant calibration, performance test, and service information.

  • Page 54: Replacing The Battery

    Model UT105: OPERATING MANUAL Maintenance(2) Warning To avoid electrical shock or arc blast, or personal injury or damage to the Meter, use specified fuses ONLY in accordance with the following procedure. To replace the Meter's fuse: 1. Turn the Meter off and remove all connections from the terminals.
  • Page 55 Model UT105: OPERATING MANUAL Maintenance(3) Warning To avoid false readings, which could lead to possible electric shock or personal injury, replace the battery as soon as the battery indicator " " appears. To replace the Meter’s battery: 1. Turn the Meter power off and remove all connections from the terminals.
  • Page 56 Model UT105: OPERATING MANUAL Copyright 2001 Uni-Trend International Limited. All rights reserved. Manufacturer: UNI-TREND TECHNOLOGY(DONG GUAN)LIMITED Address: Dong Fang Da Dao, Bei Shan Dong Fang Industrial Development District, Hu Men Town, Dong Guan City, Guang Dong Province, China Headquarters: Uni-Trend International Limited...

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