Related Manuals for UNI-T UT90A
Summary of Contents for UNI-T UT90A
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Page 1: Table Of Contents
Model UT90A: OPERATING MANUAL=VC220 Table of Contents Title Page Overview Unpacking Inspection Safety Information Rules For Safe Operation International Electrical Symbols The Meter Structure LCD Indicators Rotary Switch Functional Buttons Measurement Operation AC/DC Voltage Measurement AC/DC Current Measurement Resistance Measurement... -
Page 2: Unpacking Inspection
“Safety Information” and “Rules for Safety Operation” carefully before using the Meter. The Model UT90A (hereafter referred to as “the Meter”) is a 1999 counts low power waste electrical tester with and stabilize functions, safety operations, and reliable performance. -
Page 3: Safety Information
Model UT90A: OPERATING MANUAL certificate 1 piece In the event you find any missing or damage, please contact your dealer immediately. Safety Information This Meter complies with GB4793 standard for safety electrical measuring and test equipment, and IEC61010-1: in pollution degree 2, overvoltage category (CAT II 1000V, CAT III 600V) and double insulation. - Page 4 Model UT90A: OPERATING MANUAL to the following rules: 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.
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Page 5: International Electrical Symbols
Model UT90A: OPERATING MANUAL readings. Remove test leads from the test circuit before changeover of range. Turn the Meter power off before connect the Meter to circuit and check the fuse before measuring current. When servicing the Meter, use only the... -
Page 6: The Meter Structure
Model UT90A: OPERATING MANUAL Deficiency of Built-In Battery. Warning. Refer to the Operating Manual. China Technology Supervision Bureau, license measuring instrument Manufacture Conforms to Standards of European Union. The Meter Structure (see figure 1) ? LCD Display. ? Impedance changeover button. -
Page 7: Functional Buttons
Model UT90A: OPERATING MANUAL Below table indicated for information about the rotary switch positions. Rotary Switch Function Positio DC voltage measurement range from 200.0mV to 1000V. AC voltage measurement range from 2.000V to 750.0V. OResistance measurement range from 200.0O to 20.00MO. -
Page 8: Measurement Operation
Model UT90A: OPERATING MANUAL Impeda It is used to inspect AC/DC the resistance of voltage change supply power under over range 250V button MAX.(? ? ? ? ? ? ) rotary Turn the power of the Meter on or off. -
Page 9: Ac/Dc Current Measurement
Model UT90A: OPERATING MANUAL AC/DC voltage, connect the Meter as follows: Insert the red test lead into the“VO)” terminal and the black test lead into the COM terminal. Set the rotary switch to“V ”or“V ”,and Connect the test leads across with the power or load being measured. - Page 10 Model UT90A: OPERATING MANUAL To avoid damages to the built-in fuse and the Meter, please do not attempt parallel connect the test leads with any circuit while the test leads are inserted into the current terminal. For the safety requirement, when measure high current, every measure time should<...
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Page 11: Resistance Measurement
Model UT90A: OPERATING MANUAL completed, disconnect the connection between the test leads and measured circuit. C. Resistance Measurement(see figure 5) Warning To avoid injury to the user, please do not attempt the voltage higher than 60V/DC or 30V/AC. The resistance ranges are: 200.0O, 2.000kO, 20.00kO, 200.0kO, 2.000MOand 20.00MO. -
Page 12: Diodes Measurement
Model UT90A: OPERATING MANUAL precision readings in low-resistance measurement, that is the range of 200.0O, 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. - Page 13 Model UT90A: OPERATING MANUAL To test a diode out of a circuit, connect the Meter as follows: Insert the red test lead (anode “+”) into the terminal and the black test lead (cathode “-”) into the COM terminal. Set the rotary switch to , place the red test lead on the component’s anode and...
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Page 14: Continuity Measurement
Model UT90A: OPERATING MANUAL disconnect the connection between the testing leads and the circuit under test. E. Continuity Measurement(see figure 7) Warning To avoid injury to the user, please do not attempt the voltage higher than 60V/DC or 30V/AC. To avoid damages to the Meter or to the... - Page 15 Model UT90A: OPERATING MANUAL capacitors. Open-circuit voltage of continuity measurement is about 3V. When continuity testing has been completed, disconnect the connection between the testing leads and the circuit under test. F. Power Voltage measurement(see figure 8) Warning To avoid damage to the inside fuse and the...
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Page 16: General Specifications
Model UT90A: OPERATING MANUAL The range of 9V only fit for the measure of 9V Battery, inside load resistance is 38O. General Specifications l Maximum Voltage between any Input Terminals and COM Terminal: 1000Vp. l Fuse protection of µA mA terminal: 300mA 250V fast melt fuse. -
Page 17: Dc Voltage
Model UT90A: OPERATING MANUAL Accuracy: ±(a% reading + b digits), guarantee for 1 year. Operating temperature: 18 - 28? . Relative humidity: =75%RH. A.DC Voltage Accuracy: Range Resolution ±(a% reading + b digits) 200mV 0.1mV ±(0.5%+2) 10mV 200V 100mV 1000V ±(0.8%+3) -
Page 18: Dc Current
Model UT90A: OPERATING MANUAL C.DC Current Accuracy: Range Resolution ±(a% reading + b digits) 200mA 0.1µA 1µA ±(0.8%+2) 20mA 10µA 200mA 0.1mA 10mA ±(1.2%+5) Remarks: ?Overload Protection: AtµA mA range: Fuse 5×20mm F0.3A 250V. At A range: Fuse 6×25mm F20A 250V. -
Page 19: Resistance
Model UT90A: OPERATING MANUAL time between two measurements> 15 minutes. E. Resistance Accuracy: Range Resolution ±(a% reading + b digits) 200O 0.1O 20kO ±(0.8%+3) 200kO 100O 20MO 10kO ±(1.2%+5) Remarks: ?Overload Protection: 230V rms. F. Diodes Test Range Resolution Remark Open-circuit voltage is about 3V;... -
Page 20: Fuse Replacement
Model UT90A: OPERATING MANUAL Open circuit voltage is about 3V; Set the resistance of a open circuit> 100O, buzzer will not sound; Set the resistance of a well connected circuit=10O, buzzer sounds continuously. Remark: ?Overload Protection: 230V rms. Fuse Replacement(see figure 9) - Page 21 Model UT90A: OPERATING MANUAL Warning Before remove the case bottom, make sure the power is off, remove the test leads from terminals and test circuit. Periodically wipe the case with a damp cloth and a little mild detergent. Do not use chemical abrasives or solvents.