Related Manuals for UNI-T UT90B
Summary of Contents for UNI-T UT90B
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Page 1: Table Of Contents
Model UT90B: OPERATING MANUAL Table of Contents Title Page 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. - Page 2 Model UT90B: OPERATING MANUAL...
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Page 3: Overview
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. -
Page 4: Unpacking Inspection
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 Description 1 piece English Operating Manual Test Lead 1 pair Holster 1 piece In the event you find any missing or damage, please contact your dealer immediately. -
Page 5: Safety Information
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. -
Page 6: Rules For Safe Operation
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 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 UT90B: OPERATING MANUAL Rules For Safe Operation (2) l When servicing the Meter, use only the same model number or identical electrical specifications replacement parts. l The internal circuit of the Meter shall not be altered at will to avoid damage of the Meter and any accident.
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Page 8: International Electrical Symbols
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. -
Page 9: The Meter Structure
Model UT90B: OPERATING MANUAL The Meter Structure (see figure 1) ( figure 1) 1 LCD Display. 2 Solar Panel. 3 Impedance Changeover Button. 4 Rotary Switch. 5 Input Terminals. 6 Power Button. -
Page 10: Rotary Switch
Model UT90B: OPERATING MANUAL Rotary Switch Below table indicated for information about the rotary switch positions. µ µ... -
Page 11: Functional Buttons
Model UT90B: OPERATING MANUAL Functional Buttons Below table indicated for information about the functional button operations. voltage measurement. Turn the power on and off. Impedance changeover between LOW imp. and 400k 400k... -
Page 12: Display Symbols
Model UT90B: OPERATING MANUAL Display Symbols(1) (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 13 Model UT90B: OPERATING MANUAL Display Symbols(2) (see figure 2) Symbol Meaning Ohm. The unit of resistance. kilohm.1 x 10 or 1000 ohms. ,k ,M Megaohm. 1 x 10 1,000,000 ohms. Volts. The unit of voltage. mV, V mV: Millivolt. 1 x 10 or 0.001 volts.
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Page 14: Measurement Operation
Model UT90B: OPERATING MANUAL Measurement Operation(1) DC & AC Voltage Measurement (see figure 3) 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. -
Page 15: Ac & Dc Current Measurement
Model UT90B: OPERATING MANUAL Measurement Operation(2) 1. Insert the red test lead into the V 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. - Page 16 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.
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Page 17: Test For Diodes & Continuity
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. -
Page 20: Resistance Measurement
Model UT90B: OPERATING MANUAL Measurement Operation(7) D.Resistance Measurement (see figure7) 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. - Page 21 Model UT90B: OPERATING MANUAL Measurement Operation(8)
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Page 25: General Specifications
Model UT90B: OPERATING MANUAL General Specifications(2) l Safety/Compliances : IEC61010: CAT. II 1000V, CAT. III 600V overvoltage and double insulation standard. l Certification... -
Page 26: Accuracy Specifications
Model UT90B: OPERATING MANUAL Accuracy Specification(1) Accuracy: (a% reading + b digits),guarantee for 1 year. Operating temperature:23 Relative humidity:<75%. Temperature coefficient: 0.1 x (specified accuracy) / 1 A.DC Voltage Overload Accuracy Range Resolution Protection 230VAC 200mV 0.1mV (0.5%+2) 1000V DC... -
Page 28: Diodes & Continuity Test
Model UT90B: OPERATING MANUAL Accuracy Specification(3) E. Diodes & Continuity Test Range Resolution Overload Protection 230V rms F. Resistance Overload Accuracy Range Resolution Protection (0.8%+3) + short-circuit the input terminals 230V rms (0.8%+3) 200k (1.2%+5) Remarks: Open circuit voltage approximate 3V. -
Page 29: Maintenance
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. - Page 30 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.
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- Page 32 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...