Model UT90B: OPERATING MANUAL Table of Contents Title Overview Unpacking Inspection Safety Information Rules For Safe Operation International Electrical Symbols The Meter Structure Rotary Switch Functional Buttons Display Symbols Measurement Operation A. DC & AC Voltage Measurement B. AC & DC Current Measurement C. Test for Diodes & Continuity D. Resistance Measurement E. Power Charging The Impedance Changeover Button The POWER Button General Specifications Accuracy Specifications A. DC Voltage B.
Model UT90B: OPERATING MANUAL 2
Model UT90B: 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. The Model UT90B (hereafter referred to as “the Meter”) is a 1999 counts 3 1/2 digits multimeter with stabilized functions, safe design, and reliable performance.
Model UT90B: 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 Description English Operating Manual Test Lead Holster Qty 1 piece 1 pair 1 piece In the event you find any missing or damage, please contact your dealer immediately.
Model UT90B: 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. Use the Meter only as specified in this operating manual, otherwise the protection provided by the Meter may be impaired. In this manual, a Warning identifies conditions and actions that pose hazards to the user, or may damage the Meter or the equipment under test.
Model UT90B: 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 UT90B: OPERATING MANUAL Rules For Safe Operation (2) l l l l l l When servicing the Meter, use only the same model number or identical electrical specifications replacement parts. The internal circuit of the Meter shall not be altered at will to avoid damage of the Meter and any accident. Soft cloth and mild detergent should be used to clean the surface of the Meter when servicing. No abrasive and solvent should be used to prevent the surface of the Meter from corrosion, damage and accident.
Model UT90B: OPERATING MANUAL International Electrical Symbols AC (Alternating Current). DC (Direct Current). Grounding. Double Insulated. Deficiency of Power. Fuse Warning. Refer to the Operating Manual. Conforms to Standards of European Union.
Model UT90B: OPERATING MANUAL The Meter Structure (see figure 1) ( figure 1) 1 2 3 4 5 6 LCD Display. Solar Panel. Impedance Changeover Button. Rotary Switch. Input Terminals. Power Button.
Model UT90B: OPERATING MANUAL Rotary Switch Below table indicated for information about the rotary switch positions.
Model UT90B: OPERATING MANUAL Functional Buttons Below table indicated for information about the functional button operations. AC voltage measurement. Turn the power on and off. LOW imp.
Model UT90B: OPERATING MANUAL Display Symbols(1) (see figure 2) ( figure 2) No. Symbol 1 2 3 4 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. Indicates negative reading. Test of diode. The continuity buzzer is on. 5 Charge indicator. CHARGE 6 Indicator for AC voltage or current. The displayed value is the mean value.
Model UT90B: OPERATING MANUAL Display Symbols(2) (see figure 2) No. 7 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. µA, mA, A mA: Milliamp. 1 x 10-3 or 0.001 amperes. µA: Microamp. 1x 10-6 or 0.000001 amperes.
Model UT90B: OPERATING MANUAL Measurement Operation(1) A.DC & AC Voltage Measurement (see figure 3) red black ( 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 1000V DC/750V AC although readings may be obtained. Impedance Changeover Button turn on time must be 3 seconds. To avoid damages to the Meter, please do not attempt to press the Impedance Changeover Button when the measured voltage is higher than 250V.
Model UT90B: OPERATING MANUAL Measurement Operation(2) 1. Insert the red test lead into the VΩ terminal and the black test lead into the COM terminal. 2. Set the rotary switch to an appropriate measurement position in V or V . 3. Connect the test leads across with the object being measured. The measured value shows on the display. Note l When DC/AC voltage measurement has been completed, disconnect the connection between the testing leads and the circuit under test.
Model UT90B: OPERATING MANUAL Measurement Operation(3) Warning Never attempt an in-circuit current measurement where the open-circuit voltage between the circuit and ground is greater than 60V. 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. The measurement ranges of AC current are: 200.
Model UT90B: OPERATING MANUAL Measurement Operation(4) Note l For safety sake, the measuring time for high current should be less than 10 seconds for each measurement and the interval time between 2 measurements should be greater than 15 minutes. l When AC/DC current measurement has been completed, disconnect the connection between the testing leads and the circuit under test. C.
Model UT90B: OPERATING MANUAL Measurement Operation(7) D.Resistance Measurement (see figure7) red black ( figure 7) 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 harms to you, never attempt to measure voltages higher than 60V DC/30V AC. The resistance ranges are: 200.0Ω, 2.000kΩ, 20.00kΩ, 200.0kΩ, 2.000MΩand 20.00MΩ. To measure resistance, connect the Meter as follows: 1.
Model UT90B: OPERATING MANUAL Measurement Operation(8) 21
Model UT90B: OPERATING MANUAL General Specifications(2) l Safety/Compliances l Certification : IEC61010: CAT. II 1000V, CAT. III 600V overvoltage and double insulation standard.
Model UT90B: OPERATING MANUAL Accuracy Specification(1) Accuracy: (a% reading + b digits),guarantee for 1 year. o o Operating temperature:23 C~5 C. Relative humidity:<75%. o Temperature coefficient: 0.1 x (specified accuracy) / 1 C. A.DC Voltage Range Resolution 200mV 2V 20V 200V 1000V 0.1mV 1mV 10mV 100mV 1V Accuracy Overload Protection 230VAC (0.5%+2) 1000V DC or 750V AC continuous. (0.8%+3) Remark: Input impedance: 10MΩ B.
Model UT90B: OPERATING MANUAL Accuracy Specification(3) E. Diodes & Continuity Test Range Resolution Overload Protection 1mV 230V rms 1Ω F. Resistance Range Resolution 200Ω 0.1Ω 2kΩ 20kΩ 200kΩ 2MΩ 20MΩ 1Ω 10Ω 100Ω 1kΩ 10kΩ Accuracy Overload Protection (0.8%+3) + short-circuit the input terminals (0.8%+3) (1.2%+5) Remarks: Open circuit voltage approximate 3V.
Model UT90B: 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 UT90B: 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. Replacement of the fuses is seldom required. Burning of a fuse always results from improper operation. ** END ** This operating manual is subject to change without notice.
Model UT90B: OPERATING MANUAL 31
Model UT90B: 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.
