Model UT58A/B/C: 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 and AC Voltage Measurement B. DC and AC Current Measurement C. Measuring Resistance D. Measuring Diodes E. Testing for continuity F. Capacitance measurement G. Temperature Measurement (UT58B/UT58C only) H. Measuring Transistor I.
Model UT58A/B/C: OPERATING MANUAL Title Page K. Frequency (UT58C only) Maintenance A. General Services B. Replacing the Fuses C.
Model UT58A/B/C: OPERATING MANUAL Overview Warning To avoid electric shock or personal injury, read the “Safety Information” and “Rules for Safety Operation” carefully before using the Meter. Digital Multimeters Model UT58A, UT58B and UT58C (hereafter referred to as “the Meter”) are 3 1/2 digits with ex-large LCD, steady operations, fashionable structure and highly reliable hand-held measuring instrument. The Meter uses large scale of integrated circuit and has full range overload protection.
Model UT58A/B/C: OPERATING MANUAL Unpacking Inspection Item 1 2 3 4 5 Description English Operating Manual Test Lead Multi-Purpose Socket Point Contact Temperature Probe (UT58B/UT58C only) 9V Battery (NEDA 1604, 6F22 or 009P) Qty 1 piece 1 pair 1 piece 1 piece 1 piece In the event you find any missing or damage, please contact your dealer immediately.
Model UT58A/B/C: OPERATING MANUAL Safety Information This Meter complies with the 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 voltage overvoltages than CAT. III CAT. III: Distribution level, fixed installation, with smaller transient overvoltages than CAT.
Model UT58A/B/C: 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 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 UT58A/B/C: OPERATING MANUAL Rules For Safe Operation (2) l l l l l l l l l l l When using the test leads, keep your fingers behind the finger guards. Disconnect circuit power and discharge all high -voltage capacitors before testing resistance, continuity, diodes, capacitance or current. Before measuring current, check the Meter’s fuses and turn off power to the circuit before connecting the Meter to the circuit. Replace the battery as soon as the battery indicator appears.
Model UT58A/B/C: OPERATING MANUAL International Electrical Symbols AC (Alternating Current). DC (Direct Current). Grounding. Double Insulated. Deficiency of Built-In Battery. Warning. Refer to the Operating Manual. Conforms to Standards of European Union.
Model UT58A/B/C: OPERATING MANUAL The Meter Structure (see figure 1) (figure 1) 1. 2. 3. 4. 5. LCD Display. HOLD Button. Rotary Switch. Input Terminals.
Model UT58A/B/C: OPERATING MANUAL Functional Buttons Below table indicated for information about the functional button operations. Button Operation Performed POWER Turn the Meter on and off. (Yellow l Press down the POWER to turn on Button) the Meter. l Press up the POWER to turn off the Meter. l Press HOLD once to enter hold mode. HOLD l Press HOLD again to exit hold mode. (Blue Button) l In Hold mode, is displayed and the present value is shown.
Model UT58A/B/C: OPERATING MANUAL FmVVΩ kΩMΩ nFµFkHzµAmAA Connect Test Leads A µ AmA VΩ COM (figure 2) No. Symbol 1 2 3 Meaning The battery is low. Warning: To avoid false readings, replace the battery as soon as the battery indicator appears. AC 4 5 6 7 8 Connect Terminal 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 UT58A/B/C: OPERATING MANUAL No.
Model UT58A/B/C: OPERATING MANUAL Measurement Operation(1) A.DC and AC Voltage Measurement (see figure 3) black red (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 although readings may be obtained. The DC Voltage ranges are: 200mV, 2V, 20V, 200V and 1000V. The AC Voltage ranges are: 2V, 20V, 200V and 750V To measure DC or AC Voltage, connect the Meter as follows: 1.
Model UT58A/B/C: OPERATING MANUAL Measurement Operation(2) black red (figure 4) Warning Never attempt an in-circuit current measurement where the open circuit voltage between terminals and ground is greater than 250V . If the fuse burns out during measurement, the Meter may be damaged or the operator himself may be hurt.
Model UT58A/B/C: OPERATING MANUAL Measurement Operation(3) 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 DC Current ranges are: Model UT58A/ UT58B: 20µA,2mA,20mA, 200mA and 20A. Model UT58C: 2mA, 200mA, 20A The AC Current ranges are: 2mA, 200mA and 20A To measure current, do the following: 1. Turn off power to the circuit. Discharge all highvoltage capacitors. 2.
Model UT58A/B/C: OPERATING MANUAL Measurement Operation(4) black red (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. The resistance ranges are: Model UT 58A/UT58B:200Ω, 2kΩ, 20kΩ, 2MΩ,20MΩ and 200MΩ. Model UT 58C:200Ω, 2kΩ, 20kΩ, 2MΩ and 20MΩ. 1. Insert the red test lead into the Hz VΩ (UT58C) or VΩ (UT58A/UT58B) terminal and the black test lead into the COM terminal. 2.
Model UT58A/B/C: OPERATING MANUAL Note l The test leads can add 0.1to 0.2Ω of error to the slowresistance measurement. To obtain accurate readings in low-resistance, 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) = accurate readings of resistance. l If the input terminal short-circuit reading 0.
Model UT58A/B/C: OPERATING MANUAL Warning To avoid damage to the Meter or to the equipment under test, disconnect circuit power and discharge all high-voltage capacitors before measuring diodes. To avoid harms to you, please do not attempt to input voltages higher than 60V DC or 30V rms AC. Use the diode test to check diodes, transistors, and other semiconductor devices. The diode test sends a current through the semiconductor junction, and then measures the voltage drop across the junction.
Model UT58A/B/C: OPERATING MANUAL Measurement Operation(7) l l The open-circuit voltage is around 3V. When diode testing has been completed, disconnect the connection between the testing leads and the circuit under test. black red (figure 7) Warning To avoid harms to you, please do not attempt to input voltages higher than 60V DC or 30V rms AC.
Model UT58A/B/C: OPERATING MANUAL 9 (figure 9) 22
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Model UT58A/B/C: OPERATING MANUAL POWER 24
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Model UT58A/B/C: OPERATING MANUAL General Specifications Maximum Voltage or Current between input Terminals and Grounding: According to different functional input protection value. l l l l l l l l l l l l l l l Fused Protection for AmA Input Terminal : CE Version: 0.5A, 250V fast type, 5x20mm. Maximum Display : 1999,updates 2~3 times/ second. Range : Manual ranging. Polarity display : Automatically Overloading : Display “1”. Battery Deficiency : Display “ ”.
Model UT58A/B/C: OPERATING MANUAL Accuracy Specifications(1) Accuracy: (a% reading + b digits),guarantee for 1 year. o o Operating temperature:18 C~28 C. Relative humidity: 75%RH. A. DC Voltage Range Resolution 200mV 2V 20V 200V 1000V 0.1mV 1mV 10mV 100mV 1V Accuracy Overload Protection 250VAC (0.5%+1) 1000V AC (0.8%+2) Remarks:Input Impedance: approx.10MΩ. B. AC Voltage Range Resolution 2V 20V 200V 750V 1mV 10mV 100mV 1V Accuracy (0.8%+3) Overload Protection 1000V AC (1.
Model UT58A/B/C: OPERATING MANUAL Accuracy Specifications(2) C. DC Current Range Resolution 20µA 2mA 20mA 200mA 20A 0.01µA 1µA 10µA 0.1mA 10mA Accuracy Overload Protection (0.8%+1) Fuse 0.5A, 250V, fast type, 5x20mm (1.5%+1) (2%+5) Un-Fused Remarks: l At 20A Range: For continuous measurement 10 seconds and interval time between 2 measurement greater than 15 minutes. D. AC Current Range Resolution Accuracy Overload Protection 2mA 200mA 1µA 0.1mA (1.0%+3) (1.8%+3) Fuse 0.
Model UT58A/B/C: OPERATING MANUAL Accuracy Specifications(4) H. Capacitance Accuracy Range Resolution 2nF 1pF 200nF 0.1nF 100µF 0.1µF (4.0%+3) ±(5.
Model UT58A/B/C: OPERATING MANUAL Accuracy Specifications(5) J. Transistor test Range Resolution Accuracy±(a% reading + b digits) hFE 1β Vce 3V Ibo 10µA 1000βMAX K. Frequency ( UT58C only) Range Resolution 2kHz 20kHz 1Hz 10Hz Accuracy ±(1.
Model UT58A/B/C: 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 damp cloth and mild detergent.
Model UT58A/B/C: OPERATING MANUAL Maintenance(2) 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. Remove the fuse by gently prying one end loose, then take out the fuse from its bracket. 5. Install ONLY replacement fuses with the identical type and specification and make sure the fuse is fixed firmly in the bracket. Fuse: 0.
Model UT58A/B/C: OPERATING MANUAL ** END ** This operating manual is subject to change without notice.
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Model UT58A/B/C: OPERATING MANUAL Copyright 2001 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.
