UNI-T UT90B Operating Manual Download | Manualshive

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Summary of Contents for UT90B

Page 1: ...ement 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 AC Voltage C AC Current D DC Current E Diodes Continuity Test F Resistance Maintenance A General Service B Replacing the Fuses 3 4 5 6 8 9 10 11 12 14 14 15 17 20 22 23 23 24 26 26 26 ...

Page 2: ...Model UT90B OPERATING MANUAL 2 ...

Page 3: ...2 digits multimeter with stabilized functions safe design and reliable performance In addition to the conventional measuring function such as DC AC voltage DC AC current resistance diode and continuity it is equipped with advanced design of charging power through 220V AC or 12 36V AC DC or solar energy With such design the Meter can be used without battery therefore it will not cause chemical poll...

Page 4: ... the following items carefully to see any missing or damaged part In the event you find any missing or damage please contact your dealer immediately Model UT90B OPERATING MANUAL 4 Item 1 2 3 Description English Operating Manual Test Lead Holster Qty 1 piece 1 pair 1 piece ...

Page 5: ...al 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 A Note identifies the information that user should pay attention on International electrical symbols used on the Meter and in this Operating Manual are explained on page 8 Model UT90B OPERATING...

Page 6: ...behind the finger guards l Do not apply more than the rated voltage as marked on the Meter between the terminals or between any terminal and grounding l When the Meter working at an effective voltage over 60V in DC or 30V in AC special care should be taken for there is danger of electric shock l Use the proper terminals function and range for your measurements l The rotary switch should be placed ...

Page 7: ...ergent 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 l Turn off the Meter when it is not in use l Do not use or store the Meter in an environment of high temperature humidity explosive inflammable and strong magnetic field The performance of the Meter may deteriorate afte...

Page 8: ...ectrical 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 8 ...

Page 9: ...The Meter Structure see figure 1 9 figure 1 1 LCD Display 2 Solar Panel 3 Impedance Changeover Button 4 Rotary Switch 5 Input Terminals 6 Power Button Model UT90B OPERATING MANUAL ...

Page 10: ...10 Rotary Switch Below table indicated for information about the rotary switch positions µ µ Model UT90B OPERATING MANUAL ...

Page 11: ...tons Below table indicated for information about the functional button operations AC voltage measurement Turn the power on and off Impedance changeover between 10MΩ and 400kΩ LOW imp 400k Ω Model UT90B OPERATING MANUAL ...

Page 12: ...ould lead to possible electric shock or personal injury replace the battery as soon as the battery indicator appears 2 4 Indicates negative reading 5 Test of diode The continuity buzzer is on 3 CHARGE Charge indicator 6 Indicator for AC voltage or current The displayed value is the mean value Model UT90B OPERATING MANUAL ...

Page 13: ...ms MΩ Megaohm 1 x 106 or 1 000 000 ohms µA mA A A Amperes amps The unit of current mA Milliamp 1 x 10 3 or 0 001 amperes µA Microamp 1x 10 6 or 0 000001 amperes V Volts The unit of voltage mV Millivolt 1 x 10 3 or 0 001 volts No Symbol Meaning 7 Ω kΩ MΩ mV V 13 Model UT90B OPERATING MANUAL ...

Page 14: ...though 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 The DC voltage ranges are 200 0mV 2 000V 20 00V 200 0V and 1000V The AC voltage ranges are 2 000V 20 00V 200 0V and 750 0V To measure DC AC voltage connect the Meter as f...

Page 15: ...lue shows on the display B AC DC Current Measurement see figure 4 Note l When DC AC voltage measurement has been completed disconnect the connection between the testing leads and the circuit under test l In each range the Meter has an input impedance of 10MΩ This loading effect can cause measurement errors in high impedance circuits If the circuit impedance is less than or equal to 10kΩ the error ...

Page 16: ...A 2 000mA 20 00mA 200 0mA and 10 00A To measure current do the following 1 Turn off power to the circuit Discharge all high voltage capacitors 2 Insert the red test lead into the µAmA or 10A terminal and the black test lead into the COM terminal Use the 10A terminal and 10A or 10A range if the current value to be tested is an unknown 3 Set the rotary switch to an appropriate measurement position i...

Page 17: ...tages higher than 60V DC 30V AC figure 5 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 Test for Diodes Continuity Testing D...

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Page 20: ...stance ranges are 200 0Ω 2 000kΩ 20 00kΩ 200 0kΩ 2 000MΩand 20 00MΩ To measure resistance connect the Meter as follows 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 Ω 3 Parallel connect the test leads across with the object being measured 4 The measured value shows on the display Note l The LCD displays 1 indicating open ci...

Page 21: ...21 Measurement Operation 8 Model UT90B OPERATING MANUAL ...

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Page 25: ...25 General Specifications 2 l Safety Compliances IEC61010 CAT II 1000V CAT III 600V overvoltage and double insulation standard l Certification Model UT90B OPERATING MANUAL ...

Page 26: ...e 40Hz 400Hz l Display effective value of sine wave mean value response A DC Voltage 200mV 2V 20V 200V 1000V 0 1mV 1mV 10mV 100mV 1V Range Resolution 0 5 2 Overload Protection Accuracy 230VAC 0 8 3 1000V DC or 750VAC continuous 2V 20V 200V 750V 1mV 10mV 100mV 1V Range Resolution Overload Protection Accuracy 1000V DC or 750VAC continuous 40 100Hz 0 8 5 100 400Hz 1 0 10 40 100Hz 1 0 5 100 400Hz 1 0 ...

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Page 28: ... rms Accuracy Specification 3 F Resistance Range Resolution Overload Protection Accuracy 200Ω 2kΩ 20kΩ 200kΩ 2MΩ 20MΩ 0 1Ω 1Ω 10Ω 100Ω 1kΩ 10kΩ 0 8 3 short circuit the input terminals 0 8 3 1 2 5 230V rms Remarks Open circuit voltage approximate 3V Model UT90B OPERATING MANUAL ...

Page 29: ...ter inside the case A General Service l Periodically wipe the case with a damp cloth and mild detergent Do not use abrasives or solvents l To clean the terminals with cotton bar with detergent as dirt or moisture in the terminals can affect readings l Turn the Meter off when it is not in use and take out the battery when not using for a long time l Do not store the Meter in a place of humidity hig...

Page 30: ... 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 ...

Page 31: ...31 Model UT90B OPERATING MANUAL ...

Page 32: ...a 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 com Model UT90B OPERATING MANUAL ...

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