Model UT106: 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. DC Voltage Testing B. AV Voltage Testing C. DC Current Testing D. Resistance Testing E. Diode Testing F. Continuity Testing G. Temperature Measurement H. Frequency Measurement I.
Model UT106: OPERATING MANUAL Title F. Trigger Voltage Battery Load Testing G. Voltage Drop Testing 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.
Model UT106: 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. Automotive Digital Multimeter Model UT106 (hereafter referred to as “the Meter”) is a 1999 counts, 3-1/2 digits manual ranging meter.
Model UT106: 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 English Operating Manual 2 Test Lead 3 Point Contact Temperature Probe 4 Holster 5 9V Battery (NEDA 1604, 6F22 or 006P) Qty 1 1 1 1 1 piece pair piece piece piece In the event you find any missing or damage, please contact your dealer immediately.
Model UT106: OPERATING MANUAL Rules For Safe Operation 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 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. l Inspect the test leads for damaged insulation or exposed metal.
Model UT106: OPERATING MANUAL l If the value of current to be measured is unknown, use the maximum measurement position, and reduce the range step by step until a satisfactory reading is obtained l Replace the battery as soon as the battery indicator appears. With a low battery, the Meter might produce false readings that can lead to electric show and personal injury. l When servicing the Meter, use only the same model number or identical electrical specifications replacement parts.
Model UT106: OPERATING MANUAL Automotive Servicing Safety Guide Warning As some automobiles are installed with safety air bags, you must pay attention to the cautions in the automotive servicing manual when you are working around the components and wiring of the air bags, or any carelessness will open an air bag, resulting in some personal injury.
Model UT106: OPERATING MANUAL All the information, explanations and detailed descriptions in the operation manual have originated from the industrial information recently published. It is impossible to prove the accuracy and completeness of the information, of which we shall not be responsible for the assumption. A. The data of the automotive servicing manual have originated from the automotive servicing information. 1. Contact the local distributors of automotive components. 2.
Model UT106: OPERATING MANUAL International Electrical Symbols AC (Alternating Current). DC (Direct Current) Grounding. Double Insulated. Deficiency of Built-In Battery. Fuse. Warning. Refer to the Operating Manual. Conforms to Standards of European Union.
Model UT106: 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 UT106: OPERATING MANUAL Rotary Switch Below table indicated for information about the rotary switch positions. Rotary Function Switch Position V DC voltage measurement. V AC voltage measurement. Resistance measurement. Diode test. Continuity test, Unit: A DC Current Measurement.
Model UT106: OPERATING MANUAL Display Symbols (see figure 2) 4 2 3 1 5 6 ( figure 2) 1 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. 2 Indicates negative reading. 3 Test of diode. 4 Continuity test 5 Date hold is active. 6 Indicator of connecting test leads into Connect test leads different input terminals.
Model UT106: OPERATING MANUAL Measurement Operation Part 1 Multimeter Basic Testing A. 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. Please take extra care when measuring high voltages to avoid electric shock. The DC voltage ranges are: 200mV, 2V, 20V, 200V and 1000V. To measure DC voltage, connect the Meter as follows: 1.
Model UT106: OPERATING MANUAL 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. 10M . This loading effect can cause measurement errors in high impedance circuits.
Model UT106: OPERATING MANUAL B. AC Voltage Testing (see figure 4) ( figure 4) 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. Please take extra care when measuring high voltages to avoid electric shock. The AC voltage ranges are: 200V and 750V. To measure AC voltage, connect the Meter as follows: 1.
Model UT106: OPERATING MANUAL 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. 10M . This loading effect can cause measurement errors in high impedance circuits.
Model UT106: OPERATING MANUAL C. DC Current Testing (see figure 5) ( figure 5) Warning Before connecting the Meter in serial to the tested in-circuit, disconnect in-circuit power. If the fuse burns out during measurement, the Meter 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 otherwise it will burn the fuse or damage to the Meter.
Model UT106: OPERATING MANUAL Note l If the value of current to be measured is unknown, use the maximum measurement position (10A) and 10A terminal, and reduce the range step by step until a satisfactory reading is obtained. l When DC current measurement has been completed, disconnect the connection between the testing leads and the circuit under test. l When measuring 5A~10A: for continuous measurement 10 seconds and interval time between 2 measurement greater than 15 minutes.
Model UT106: OPERATING MANUAL D. Resistance Testing (see figure 6) ( figure 6) 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. To avoid harm to yourselves , never attempt to input an effective voltage over 60V in DC or 30V in AC. The resistance ranges are: 200 , 2k , 20k , 200k , 2M and 20M . To measure resistance, connect the Meter as follows: 1.
Model UT106: OPERATING MANUAL 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 , shortcircuit 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 UT106: OPERATING MANUAL E. Diode Testing (see figure 7) ( figure 7) 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. To avoid harm to yourselves , never attempt to input an effective voltage over 60V in DC or 30V in AC. Use the diode test to check diodes, transistors, and other semiconductor devices.
Model UT106: OPERATING MANUAL Note l In a circuit, a good diode should still produce a forward voltage drop reading of 0.5V to 0.8V; however, the reverse voltage drop reading can vary depending on the resistance of other pathways between the probe tips. l Connect the test leads to the proper terminals as said above to avoid error display. l The open-circuit voltage is around 2.7V when testing diode. l The LCD will display “1” indicating open-circuit or wrong polarity connection.
Model UT106: OPERATING MANUAL F. Continuity Testing (see figure 7) 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. To avoid harm to yourselves , never attempt to input an effective voltage over 60V in DC or 30V in AC. To test for continuity, connect the Meter as below: 1. Insert the red test lead into the terminal and the black test lead into the COM terminal. 2.
Model UT106: OPERATING MANUAL G. Temperature Measurement (see figure 8) Black Red ( figure 8) Warning To avoid harm to yourselves , never attempt to input an effective voltage over 60V in DC or 30V in AC. The temperature measurement range is -400C ~ 10000C. To measure temperature, connect the Meter as below: 1. Insert the red test lead into the mA0C terminal and the black test lead into the COM terminal. 2. Set the rotary switch to 0C. 3.
Model UT106: OPERATING MANUAL H. Frequency Measurement (see figure 9) ( figure 9) Warning To avoid harm to yourselves , never attempt to input an effective voltage over 60V in DC or 30V in AC. The measurement range is 2kHz. To measure frequency, connect the Meter as follows: 1. Insert the red test lead into the Hz terminal and the black test lead into the COM terminal. 2. Set the rotary switch to 2kHz. 3. Connect the test leads across with the object being measured. 4.
Model UT106: OPERATING MANUAL I. Dwell Testing (see figure 10) Ignition Coil Red Test Lead Ground Black Test Lead ( figure 10) 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.
Model UT106: OPERATING MANUAL J. Engine Tach (Rotation Speed) Testing “RPMx10” (see figure 11) Ignition Coil Red Test Lead Ground Black Test Lead ( figure 11) The RPM means the rotating frequency of the main shaft of the engine per minute. 1. Set the rotary switch to RPMx10. 2. As prompted at the LCD connect terminal, insert the red test lead into the terminal and the black one into the COM terminal. Select an appropriate number of cylinders. Connect the ends to be tested as illustrated.
Model UT106: OPERATING MANUAL K.
Model UT106: OPERATING MANUAL Part 2 Diagnosis of Automotive Troubles The Meter UT106 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 Meter UT106 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. Set the rotary switch to 200 . 2.
Model UT106: OPERATING MANUAL B. Switch Testing: Check the switch to see if it can work correctly. 1. The same as in Items 1 to 3 (Fuse Testing). 2. Connect the black test lead probe to one end of the switch and the red one to another end. When the switch is connected, the reading of the meter should be displayed less than 10 . When the switch is cut off, overload “1” should be displayed as the reading of the meter. C. Solenoid or Relay Testing 1. The same as in Items 1 to 3 (Fuse Testing). 2.
Model UT106: OPERATING MANUAL D. Starting/Charging System Testing The on-off package of the engine starting system consists of a battery, engine starting button, solenoid and relay starting buttons, lead connections and lines. During the operation of the engine, the charging system keeps the battery charged. This system consists of an AC generator, voltage calibrator, lead connections and circuits. The multimeter is an effective tool for the checking of these systems. 1.
Model UT106: OPERATING MANUAL E. Battery Power Consumption Testing when the Engine Is off The test is carried out to find the amperage of the power consumption of the battery when both the ignition key and the engine are off. The test is helpful for the determination of the additional consumption of the battery, which may finally lead to the exhaustion of the battery. 1. Turn off and close the ignition key and all its accessories.
Model UT106: OPERATING MANUAL F. Trigger Voltage Battery Load Testing Upon the start of the engine, test the battery to see if it can offer an adequate voltage. 1. Set the rotary switch to 20 VDC. 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. Interrupt the ignition system to disable the start of the automobile. Cut off the main ignition coil, shunt coil, cam and starting sensor so as to interrupt the ignition system.
Model UT106: OPERATING MANUAL 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. The resistance will restrict the currents upon the start of the engine, leading to the reduction of the load voltage of the battery and the slow-down of the start of the engine. 1. Cut off the ignition system so as to disable the start of the automobile.
Model UT106: OPERATING MANUAL Component Voltage Switch 300 mV Lead 200 mV Grounding 100 mV Battery Lead Connector 50 mV Wiring 0.0 V Compare the readings of the tested voltages against the said table. If the voltage is on the high side, check the components and connectors to see if there is anything wrong. If anything wrong is found, do necessary servicing.
Model UT106: OPERATING MANUAL 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 to the 200mV or 2 VDC. As prompted at the LCD connect terminal, insert the red test lead into the A terminal and the black one into the COM terminal. 2.
Model UT106: OPERATING MANUAL 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 to the 200 . As prompted at the LCD connect terminal, insert the red test lead into the 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 0.5 .
Model UT106: OPERATING MANUAL (5) Set the rotary switch to the 200k and test the primary 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 primary resistance is generally in a range of 6k to 30k . Refer to various kinds of automotive manuals for the details. (8) For a heater ignition coil, repeat the said testing steps.
Model UT106: OPERATING MANUAL 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 to the 200 k . As prompted at the LCD connect terminal, insert the red test lead into the terminal and the black one into the COM terminal.
Model UT106: OPERATING MANUAL (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 200 .
Model UT106: OPERATING MANUAL 5. RPMx10 Testing (see figure 17) Ignition Coil Red Black Ground (figure 17) (1) Set the rotary switch to RPMx10 and select the number of cylinders in the automobile to be tested. (2) As prompted at the LCD connect terminal, insert the red test lead into the terminal and the black one into the COM terminal. (3) Connect the black test lead probe to the ground (i.e.
Model UT106: OPERATING MANUAL 6. Fuel System Testing It is necessary to add more accurate engine fuel control to a low injection automobile. Since 1980, the automotive manufacturing industry has used electronically-controlled carburetor and fuel injection so as to achieve lower fuel injection. (1) GM (General Motor): Testing the dwell of the C-3 mixed-control solenoid: Place the solenoid in a cylinder, monitoring the ratio between the air and the fuel, which should generally be 14.
Model UT106: OPERATING MANUAL The testing method is similar to that of the resistance of an ignition coil. [1] Cut the electric link off the injector. (Refer to the servicing handbooks of various kinds of automotive manuals for the detailed position.) [2] 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 10 . J.
Model UT106: OPERATING MANUAL 1. Oxygen Sensor The oxygen sensor is used to test the oxygen content in the exhaust, giving rise to an appropriate voltage or resistance. A low voltage (high resistance) means a too high oxygen content in the exhaust, while a high voltage (low resistance) means a too low oxygen content. The computer regulates the ratio between the air and the fuel according to the high or low voltage. There are normally two types of oxygen sensors: the zirconia and titania sensors.
Model UT106: OPERATING MANUAL The zirconia sensor is tested with the 2VDC. As prompted at the LCD connect terminal, insert the red test lead into the V terminal and insert the black test lead into the COM terminal. The titania sensor is tested with the 200k . As prompted at the LCD connect terminal, insert the red test lead into the terminal and insert the black test lead into the COM terminal. Secure the sensor with a table vice, light up the propane burner and add a heat sensor terminal.
Model UT106: OPERATING MANUAL 2. Temperature Sensor (see figure 20) Heater Temperature Sensor Red Black (figure 20) 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 UT106: OPERATING MANUAL 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. (2) Connect the red and black test lead probes respectively to the signal test terminal and ground terminal.
Model UT106: OPERATING MANUAL 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. Testing Procedure: (1) Connect the DC voltage type MAP sensor in the DC voltage testing method and set the rotary switch to 20 VDC.
Model UT106: OPERATING MANUAL 5. Mass Air Flow (MAF) Sensor (see figure 23) Ground Black Red Low frequency MAF Sensor of GM (General Motor) in 1988 or Before (figure 23) The sensor converts the air flow into a DC voltage, low frequency or high frequency signal. The Meter 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 to 20VDC.
Model UT106: OPERATING MANUAL 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.) Warning l The reading becomes the actual RPM only after it is multiplied by 10. l Frequency = RPM/30. (This only applies to 4CYL.
Model UT106: OPERATING MANUAL General Specifications l Maximum Voltage between any Terminals and grounding: Refer to different range input protection voltage. l Fuse Protection of mA0C terminal: 315mA, 250V, fast type, 5x20mm l Fuse Protection of A terminal: 10A, 250V, fast type, 5x20mm l Measurement Speed: Updates 2-3 times /second. l Maximum Display: 1999. l Temperature: Operating: 0 0 C ~40 0 C (32 0 F~104 0 F). Storage: -10 0 C ~50 0 C (14 0 F~122 0 F).
Model UT106: OPERATING MANUAL Accurate Specifications Accuracy: (a% Reading + Digits), guarantee for 1 year. Operating Temperature: 180C to 280C. Relative Humidity: No more than 75% RH. A. DC Voltage Range Resolution Accuracy 200mV 2V 20V 200V 1000V 0.1 mV 1 mV 10 mV 100 mV 1V Overload Protection 230VAC (0.5%+2) 1000 VDC or 750 VAC continuous (0.8%+2) Remark: Input impedance: Around 10M . B. AC Voltage Range Resolution Accuracy 200V 750V 100mV 1V (0.
Model UT106: OPERATING MANUAL C. DC Current Range Resolution Accuracy 200mA 0.1 mA 10A 10 mA Overload Protection Fuse 315mA, 250V, fast type, 5x20mm Fuse 10A, 250V, (1.2%+5) fast type, 5x20mm (0.8%+5) Remark: l When measuring 5 to 10A: For continuous measurement 10 seconds and interval time between 2 measurement greater than 15 minutes. D. Resistance Range Resolution Accuracy 200 2k 20k 200k 2M 20M 0.1 1 10 100 1k 10k (0.8%+5) Overload Protection 600Vp (1.5%+5) E.
Model UT106: OPERATING MANUAL F. Continuity Testing Range Overload Protection Resolution 1 600Vp Remark: l Open circuit voltage approximate 2.7V. l The buzzer does not sound when the resistance value is >100 . The circuit is disconnected. l The buzzer sounds continuously when the resistance value is 10 . The circuit is in good condition. l The buzzer may or may not sound when the resistance value is between 10 ~100 . G.
Model UT106: OPERATING MANUAL I. Dwell Testing Range Resolution Accuracy 4CYL 6CYL 8CYL 0.10 Remark: l Input Scope: 0.5mS (3%+5) Overload Protection 600 Vp 10V in forward impulse; Bandwidth J. Tach (Rotation Speed) Testing Range Resolution Accuracy 4CYL 6CYL 8CYL 10 RPM (3%+5) Overload Protection 600 Vp Remark: l Input Scope: 10V in forward impulse; Bandwidth 0.5mS l Maximum Tach: 10000 RPM, Tach = Displayed Reading x 10.
Model UT106: OPERATING MANUAL Maintenance 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 UT106: OPERATING MANUAL B. Replacing the Fuses (see figure 24) Holster Screw (figure 24) 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 UT106: OPERATING MANUAL C. Replacing the Battery (see figure 25) Open up Screw Battery (figure 25) 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 screw from the battery compartment and open the battery compartment. 4.
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Model UT106: OPERATING MANUAL Copyright 2005 Uni-Trend Group Limited. All rights reserved. Manufacturer: Uni-Trend Technology (Dongguan) Limited Dong Fang Da Dao Bei Shan Dong Fang Industrial Development District Hu Men Town, Dongguan City Guang Dong Province China Postal Code: 523 925 Headquarters: Uni-Trend Group Limited 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.
