Model UT105: OPERATING MANUAL Table of Contents Title 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. AC and DC Voltage Testing B. DC Current Testing C. Resistance Testing D. Diode Testing E. Continuity Testing F. Dwell Testing G. Engine Tach (Rotation Speed) Testing “RPMx10” H.
Model UT105: OPERATING MANUAL Title H. Charging System Voltage Testing I. 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 J. Engine Sensor Testing 1. Oxygen Sensor 2. Temperature Sensor 3. Position Sensor 4. Absolute Pressure (MAP) and Baro Sensor 5. Mass Air Flow (MAF) Sensor General Specifications Accurate Specifications A. DC Voltage B. AC Voltage C.
Model UT105: OPERATING MANUAL Overview This Operating Manual covers information on safety and cautions. Please read the relevant information carefully and observe all the Warnings and Notes strictly. Warning 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.
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 1 2 3 4 Qty Description 1 piece English Operating Manual 1 pair Test Lead Alligator Clip 1 pair 9V Battery (NEDA 1604, 6F22 or 006P) 1 piece In the event you find any missing or damage, please contact your dealer immediately.
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 transient overvoltages than CAT.
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: l l l l l l l l l 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. Look for cracks or missing plastic. Pay attention to the insulation around the connectors.
Model UT105: OPERATING MANUAL Rules For Safe Operation (2) 7
Model UT105: OPERATING MANUAL 8
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.
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. 7. Check the leads: any connection of sharp edges, connection of hot surfaces (such as exhaust manifold), shrinkage, burn or scratch at the insulation or right line connection. 8.
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.
Model UT105: OPERATING MANUAL The Meter Structure (see figure 1) (figure 1) 1. LCD display 2. Data Hold button 3. Rotary Switch 4. Input Terminals 5.
Model UT105: OPERATING MANUAL Rotary Switch Below table indicated for information about the rotary switch positions. Rotary Function Switch Position V DC voltage measurement. V A AC voltage measurement. DC Current Measurement Diode test. Continuity test. Resistance measurement.
Model UT105: OPERATING MANUAL Functional Buttons Below table indicated for information about the functional button operations. AC voltage measurement. Turn the power on and off. HOLD l l l Press HOLD once to enter hold mode. Press HOLD again to exit hold mode and the present value is shown.
Model UT105: OPERATING MANUAL Display Symbols (see figure 2) 1 2 3 8 4 5 6 7 ( figure 2) No. Symbol 1 2 AC 3 4 5 6 7 Connect Terminal 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. Indicator for AC voltage or current. The displayed value is the mean value. Indicates negative reading. Test of diode. The continuity buzzer is on. Date hold is active.
Model UT105: OPERATING MANUAL Display Symbols(2) (see figure 2) No. 8 Symbol Meaning Ω: Ohm. The unit of resistance. Ω,kΩ,MΩ kΩ: kilohm.1 x 103 or 1000 ohms. MΩ: Megaohm. 1 x 106 or 1,000,000 ohms. mV, V V: Volts. The unit of voltage. mV: Millivolt. 1 x 10-3 or 0.001 volts. A: Amperes (amps). The unit of current. mA: Milliamp. 1 x 10-3 or 0.001 amperes. DWELL Test of Dwell. RPM x10 Tach x 10. 4CYL, Number of cylinders.
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. The DC voltage ranges are: 200.0mV, 2.000V, 20.00V, 200.0V and 1000V. The AC voltage ranges are: 2.000V, 20.00V, 200.0V and 750V To measure DC or AC voltage, connect the Meter as follows: 1.
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. l In each range, the Meter has an input impedance of approx. 10MΩ.
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. The measurement ranges of DC current are: 200.0mA and 10.00A. To measure current, do the following: 1. Turn off power to the circuit. Discharge all highvoltage capacitors. 2.
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. The resistance ranges are: 200.0Ω, 2.000kΩ, 20.00kΩ, 200.0kΩ, 2.000MΩand 20.00MΩ.
Model UT105: OPERATING MANUAL Measurement Operation(5) Note l The test leads can add 0.1Ωto 0.2Ω of error to the resistance measurement. To obtain precision readings in low-resistance, that is the range of 200Ω, short-circuit the input terminals beforehand and record the reading obtained (called this reading as X). (X) is the additional resistance from the test lead. Then use the equation: measured resistance value (Y) – (X) = precision readings of resistance. l When the resistance reading 0.
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. Use the diode test to check diodes, transistors, and other semiconductor devices.
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 positiveconnection voltage-drop value. l When diode testing has been completed, disconnect the connection between the testing leads and the circuit under test. E.
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. Now as an automobile is ignited electronically, it is no longer necessary to adjust the dwell. In addition, the dwell testing can also be used to test a mixed-controlled solenoid. (e.g. GM feedback carburetor). 1.
Model UT105: OPERATING MANUAL Measurement Operation(9) l 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. 3. Connect the black test lead probe to the good ground terminal of the automobile. 4.
Model UT105: OPERATING MANUAL Measurement Operation(10) l 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. If an ignition system with a distributor board is used in the automobile, connect the red test lead probe to the primary negative end of the ignition coil.
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 to how the multimeter is used to diagnose any trouble with a fuse, switch, solenoid, relay, starting and charging systems, ignition system, fuel system and engine sensor. A.Fuse Testing: Check the fuse to see if it is blown out. 1.
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 200Ω . (See the details in the automotive manual.) Warning: Both ends of a general solenoid or relay are connected with diodes. l Check to see if there is any damaged coil.
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. (5) Connect the black test lead probe to the negative pole of the battery and the red one to the positive pole of the battery. 2.
Model UT105: OPERATING MANUAL Measurement Operation(15) Voltage 9.6 V or more 9.5 V 9.4 V 9.3 V 9.1V 8.9 V 8.7 V 8.5 V Temperature o o 21.1 C (70 F) o o 15.6 C (60 F) o o 10.0 C (50 F) o o 4.4 C (40 F) o o -1.1 C (30 F) o o -6.7 C (20 F) o o -12.2 C (10 F) o o -17.8 C (0 F) G.Voltage Drop Testing Test the voltage drops caused by the switch, cable, solenoid or connector. Any abnormal voltage drop generally results from an additional resistance.
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. 3.Refer to the LOSS typical trigger voltage circuit.
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 As prompted at the LCD connect terminal, insert the red test lead into the V terminal and the black one into the COM terminal. 2.
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 200Ω . As prompted at the LCD connect terminal, insert the red test lead into the Ω terminal and the black one into the COM terminal. Test the primary coil of the ignition coil. (3) Short circuit the red and black test lead probes. Their short circuit resistance should be less than 0.
Model UT105: OPERATING MANUAL Measurement Operation(19) (5) Set the rotary switch to the 200kΩ 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. (7) The secondary resistance is generally in a range of 6 kΩ to 30 kΩ. Refer to various kinds of automotive manuals for the details. (8) For a heater ignition coil, repeat the said testing steps.
Model UT105: OPERATING MANUAL Measurement Operation(20) Warning: 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. Refer to various kinds of automotive manuals for the details. (2) Set the rotary switch of the meter to the 200 kΩ.
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 source end of the sensor and the negative pole to the ground end of the sensor by referring the details to the positions of the source and ground ends of the sensor in various kinds of automotive manuals. (3) Set the rotary switch of the meter to 200Ω .
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 150Ω to 1 kΩ. Refer to the ranges of resistance in various kinds of automotive manuals for the details. 5.RPMx10 Testing (see figure 14) (1) Set the rotary switch to RPMx10 and select the number of cylinders in the automobile to be tested.
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. l Warning: The displayed value of the meter becomes the actual tach reading only after it is multiplied by 10. 6.
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.) B. Connect the red and black test lead probes to the two ends of the injector. The general normal resistance is less than or equal to 10Ω . J.
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 computercontrolled regulators were installed in the automobile and the sensors provided the computer with some data required. The multimeter is an effective tool for the detection of the operation of a sensor. 1.Oxygen Sensor The oxygen sensor is used to test the oxygen content in the exhaust, giving rise to an appropriate voltage or resistance.
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. Refer the positions of the hot ends in various kinds of automotive manuals. At this time, connect the red and black test lead probes respectively to these two hot ends.
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. Testing Procedure: (1) The same as in the resistance testing method.
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. Testing Procedure: (1) The same as in the resistance testing method.
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. Refer to relevant manuals for other automotive manufacturers.
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. (4) Turn on the ignition key but do not start the engine. Displayed Values: DC Voltage Type Sensor: In a vacuum state, the displayed value is generally between 3 V and 5 V. (The details shall be based on the parameters furnished by the supplier.
Model UT105: OPERATING MANUAL Measurement Operation(31) 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: (1) Connect the DC voltage type MAF sensor in the DC voltage testing method and set the rotary switch of the meter to 20VDC.
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%. (This only applies to GM low frequency sensors.) The other low frequency sensors shall be based on the parameters furnished by the supplier.
Model UT105: OPERATING MANUAL General Specifications l Maximum Voltage between any Terminals and grounding: Refer to different range input protection voltage. l Fuse Protection of mA terminal : CE Version: 315mA, 250V, fast type, 5x20mm l Fuse Protection of 10A terminal : CE Version: 10A, 250V, fast type, 5x20mm Measurement Speed : Updates 2-3 times /second. Maximum Display : 1999.
Model UT105: OPERATING MANUAL Accurate Specifications(1) Accuracy: (a% Reading + Digits), guarantee for 1 year. o o Operating Temperature: 18 C to 28 C. Relative Humidity: No more than 75% RH. A.DC Voltage Range Resolution 200mV 2V 20V 200V 1000V 0.1mV 1mV 10mV 100mV 1V Accuracy Overload Protection 230VAC (0.5%+5) 1000 VDC or 750 VAC continuous (0.8%+5) Remark: Input impedance: 10MΩ B.AC Voltage Range Resolution 2V 20V 200V 750V 1mV 10mV 100mV 1V Accuracy Overload Protection (0.
Model UT105: OPERATING MANUAL Accurate Specifications(2) D.Resistance Range Resolution 200Ω 2kΩ 20kΩ 200kΩ 2MΩ 20MΩ 0.1Ω 1Ω 10Ω 100Ω 1kΩ 10kΩ Accuracy (0.8%+5) Overload Protection 600Vp (1.5%+5) E.Diode Range Resolution Overload Protection 1mV 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 Range Resolution Overload Protection 1Ω 600Vp Remarks: l Open circuit voltage approximate 2.7V.
Model UT105: OPERATING MANUAL Accurate Specifications(3) G.Dwell Testing Range Resolution Accuracy Overload Protection 4CYL 6CYL 8CYL 0.1 o (3%+5) 600 VP Remark: Input Amplitude: More than or equal to 10 V in direct impulse; more than or equal to 0.5 mS in width. H.Tach (Rotation Speed) Testing Range Resolution Accuracy Overload Protection 4CYL 6CYL 8CYL 10 RPM (3%+5) 600 VP Remarks: l Input Amplitude: More than or equal to 10 V in direct impulse; more than or equal to 0.5 mS in width.
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. To avoid electrical shock or damage to the Meter, do not get water inside the case. A.General Service l Periodically wipe the case with a damp cloth and mild detergent.
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. 2. Remove the holster from the Meter. 3. Remove the 3 screws from the case bottom, and separate the case top from the case bottom. 4.
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. 2. Take the Meter out from the holster. 3. Remove the 3 screws from the case bottom, and separate the case top from the case bottom. 4. Remove the battery from the battery connector. 5.
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 Address: Rm901, 9/F, Nanyang Plaza 57 Hung To Road Kwun Tong Kowloon, Hong Kong Tel: (852) 2950 9168 Fax: (852) 2950 9303 Email: info@uni-trend.com http://www.uni-trend.
