Model UT90B: OPERATING MANUAL 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 A. AC/DC Voltage Measurement B. AC/DC Current Measurement C. Resistance Measurement D. Diodes Measurement E. Continuity Measurement F. Built-in Power Deficiency Charge General Specifications Accuracy Specifications A. DC Voltage B. AC Voltage C.
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 Safety Operation” carefully before using the Meter.
Model UT90B: OPERATING MANUAL Item Description Qty 1 Operating Manual 1 piece 2 Test Lead 1 pair 3 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.
Model UT90B: OPERATING MANUAL 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: z z z z z z z z 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. Inspect the test leads for damaged insulation or exposed metal.
Model UT90B: OPERATING MANUAL z z z z z z z all high-voltage capacitors before testing resistance, diodes or continuity. Charge as soon as the Meter indicator appears to keep precision of the 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 same model number or identical electrical specifications replacement parts.
Model UT90B: OPERATING MANUAL Grounding. Double Insulated. Deficiency of Built-In Battery. Warning. Refer to the Operating Manual. China Technology Supervision Bureau, license for measuring instrument Manufacture Conforms to Standards of European Union. The Meter Structure (see figure 1) LCD Display. solar receiver. Impedance optional Button. Rotary Switch. Input Terminals. 6 Power Button. LCD indicators(see figure 2) appear at AC measurement, disappear at DC measurement. display the minus readings.
Model UT90B: OPERATING MANUAL MV, V mA, mA, A Voltage unit: millivolt, volt Current unit: microampere, milliampere, ampere Rotary Switch Below table indicated for information about the rotary switch positions. Rotary Switch Positio n V V Ω Function DC voltage measurement range from 200.0mV to 1000V. AC voltage measurement range from 2.000V to 750.0V. ΩResistance measurement range from 200.0Ω to 20.00MΩ. Diode test. A A CHARGE Continuity test. DC current measurement range from 200.0µA to 20.00A.
Model UT90B: OPERATING MANUAL functional button operations. Button Impeda nce change over button Measur ing Functi on Operation Performed AC/DC voltage range It is used to inspect the resistance of supply power under 250V MAX.( ) Any rotary switch position Turn the power of the Meter on or off. Measurement Operation A.
Model UT90B: OPERATING MANUAL The DC voltage ranges are: 200.0mV, 2.000V, 20.00V, 200.0V, 1000V; The AC voltage ranges are: 2.000V, 20.00V, 200.0V, 750.0V. To measure AC/DC voltage, connect the Meter as follows: 1. 2. 3. 4. 5. Insert the red test lead into the“VΩ)” 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.
Model UT90B: OPERATING MANUAL B. AC/DC Current Measurement (see figure 4) Warning 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 10 seconds and the time between two measurements should 15 minutes. The measurement ranges of current are: 200.0µA, 2.000mA, 20.00mA, 200.0mA and 20.00A.
Model UT90B: OPERATING MANUAL z Please use the ranges from high to low if the current not being confirmed. z When current measurement has been 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: 200.0Ω, 2.000kΩ, 20.00kΩ, 200.0kΩ, 2.000MΩand 20.00MΩ. To measure resistance, connect the Meter as follows: 1. 2.
Model UT90B: OPERATING MANUAL z capacitors. The test leads can add 0.1Ωto 0.2Ω of error to resistance measurement. To obtain precision readings in low-resistance measurement, that is the range of 200.0Ω, 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. z When the resistance reading≥0.
Model UT90B: OPERATING MANUAL junction, then measures the voltage drop across the junction. A good silicon junction drops between 0.5V and 0.8V. To test a diode out of a circuit, connect the Meter as follows: 1. 2. 3. Insert the red test lead (anode “+”) into the VΩ terminal and the black test lead (cathode “-”) into the COM terminal. , place the red Set the rotary switch to test lead on the component’s anode and place the black test lead on the component’s cathode.
Model UT90B: OPERATING MANUAL capacitors. z When diode testing has been completed, 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 devices under test, disconnect circuit power and discharge all the capacitors before measuring continuity. To test for continuity, connect the Meter as below: 1.
Model UT90B: OPERATING MANUAL Note z To measure online capacity, please turn off power of the circuit and discharge all capacitors. z z 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. Built-in Power Deficiency Charge (see figure 8) Warning To avoid damage to the Meter, please do not attempt changeover the rotary range during charge.
Model UT90B: OPERATING MANUAL into the 9-12 charge. 3. Power plug to start the Solar energy charge. Charge through the solar energy receive window receive solar energy from sun light. Indicator “-6V” on the display is rated charge voltage(comparative value), the time of 220 V Power or 9-12 low voltage power charge is about 5 minutes. Note z The Built-in Power Deficiency indicator appear on the display, please charge in time to keep the precision reading of the Meter. z z Choose the right way of charge.
Model UT90B: OPERATING MANUAL /second. Range: Manual. Polarity: Automatically display. Over load indicator: “1”. . Battery Deficiency: Display Temperature: Operating: 0 ~40 (32 ~104 ). Storage: -10 ~50 (14 ~122 ). z Relative Humidity: ≤75% @ 0 - 30 ; ≤50% @ 31 - 40 . z Supply Power: 220V 9-12 or solar energy charge. z Dimensions (HxWxL): 179 x 88 x 39mm. z Weight: ? g. z Safety/Compliances: IEC61010: CAT II 1000V CAT III 600V.
Model UT90B: OPERATING MANUAL 1000V 1V ±(0.8%+3) Remark: ●Input impedance: 10MΩ. ●Overload Protection: 1000V DC or 750V AC continuously measure(except 200mV 230V AC). B.AC Voltage Range Accuracy: ±(a% reading + b digits) Resolution 2V 1mV ±(0.8%+5) 20V 10mV 200V 100mV 750V 1V ±(1.0%+5) Remarks: ●Input impedance: 10MΩ. ●Overload Protection: 1000V DC or 750V AC continuously measure. ●Frequency response: 40Hz ~ 400Hz. ●Displays effective value of sine wave (mean value response). C.
Model UT90B: OPERATING MANUAL AtµA mA range: Fuse 5×20mm F0.3A 250V. At A range: Fuse 6×25mm F20A 250V. continuous measure time 10 seconds. time between two measurements 15 minutes. D. AC Current Range Resolution Accuracy: ±(a% reading + b digits) 200µA 0.1µA 2mA 1µA ±(1.2%+5) 20mA 10µA 200mA 0.1mA 20A 10mA ±(2.0%+5) Remarks: ●Frequency response: 40Hz – 400Hz. ●Overload Protection: AtµA mA range: Fuse 5×20mm F0.3A 250V. At A range: Fuse 6×25mm F20A 250V. continuous measure time 10 seconds.
Model UT90B: OPERATING MANUAL ●Overload Protection: 230V rms. F. Diodes Test Range Resolution 1mV Remark Open-circuit voltage is about 3V; transistor PN normal voltage is about 0.5~0.8V. Remarks: ●Overload Protection: 230V rms. G. Continuity Test Resolutio Range n 1Ω Remark Open circuit voltage is about 3V; Set the resistance of a open circuit 100Ω, buzzer will not sound; Set the resistance of a well connected circuit≤10Ω, buzzer sounds continuously. Remark: ●Overload Protection: 230V rms.
Model UT90B: OPERATING MANUAL when there is not any response on the display during current measurement. Replace the damaged fuse with identical model number or electrical specifications. To replace the fuse as follows: 1. Turn the Meter to OFF position, and remove the test leads from terminals. 2. Take off the holster as figure 9 shows. 3. Remove the 3 screws from the case bottom, separate the case bottom, then replace the damaged fuse.
Model UT90B: OPERATING MANUAL test, and service information. ** END ** This operating manual is subject to change without notice. C Copyright 2001 Uni-Trend International Limited. ○ All rights reserved. Manufacturer: Uni-Trend International 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.
