UNI-T UT90C Operating Manual Download Page 31

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C. Resistance

Range

Resolution

Overload
Protection

Accuracy

400

Ω

40k

Ω

400k

Ω

40M

Ω

0.1

Ω

100

Ω

10k

Ω

(1%+2)

600Vp

(1.2%+2)

(1.5%+2)

(1.2%+2)

Remarks:

Open circuit voltage: approx. 0.45V

D. Diode & Continuity

1mV

Ω

Range Resolution Overload Protection

600Vp

E. Capacitance Test

Range

Resolution

Overload
Protection

Accuracy

40nF

400nF

4µF

40µF

100µF

10pF

100pF

1nF

10nF

100nF

(3%+5)

600Vp

(3%+10)

(4%+5)

Accuracy Specification(2)

Model UT90C: OPERATING MANUAL

Summary of Contents for UT90C

Page 1: ...Diodes Continuity Capacitance C Frequency Measurement D AC DC Current Measurement E Power Charging Operation of Hold Mode The Use of Relative Value Mode The RESET Button The SELECT Button Sleep Mode General Specifications Accuracy Specifications A AC Voltage B DC Voltage C Resistance D Diode Continuity E Capacitance Test F Frequency Test G AC Current H DC Current 3 4 5 6 8 9 10 11 12 14 14 16 21 2...

Page 2: ...Title Page Maintenance A General Service B Replacing the Fuses 34 2 34 34 Model UT90C OPERATING MANUAL ...

Page 3: ...cal tester 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 data hold and continuity it is equipped with capacitance test frequency test relative mode and advanced design of charging power through 220V AC or 12 36V AC DC or solar energy With such design the Meter can be used withou...

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 Item 1 2 3 Description English Operating Manual Test Lead Holster Qty 1 piece 1 pair 1 piece Model UT90C OPERATING MANUAL 4 ...

Page 5: ...ating manual 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 UT90C...

Page 6: ...hen using the test leads keep your fingers 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 from there is danger of electric shock l Use the proper terminals function and range for your measurements l The rotary switc...

Page 7: ...ny accident l Soft cloth and mild detergent 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 performa...

Page 8: ...g Current DC Direct Current AC or DC Grounding Double Insulated Deficiency of Built In Battery Continuity Test Diode Fuse Warning Refer to the Operating Manual Conforms to Standards of European Union Capacitance Test Model UT90C OPERATING MANUAL 8 ...

Page 9: ...The Meter Structure see figure 1 9 figure 1 1 LCD Display 2 Solar Panel 3 SELECT Button 4 Rotary Switch 5 HOLD Button 6 Input Terminals 7 Relative Mode RESET Button Model UT90C OPERATING MANUAL ...

Page 10: ... Rotary Switch Position Function AC DC voltage measurement Diode test Resistance measurement Ω AC or DC Current Measurement Power is turned off OFF Continuity test Capacitance test Ω Hz Frequency Test l 230V MAX Charge at 220VAC l 12 36V Charge at 12 36V CHARGE Model UT90C OPERATING MANUAL ...

Page 11: ... enter and exit the mode in any measuring mode except in frequency and charge mode the Meter beeps SELECT Switches between AC and DC voltage current the Meter beeps DC is default Switches between resistance diode continuity and capacitance measurements the Meter beeps Resistance is default Ω Any rotary switch position Press to enter and exit the Hold mode in any mode the Meter beeps Model UT90C OP...

Page 12: ...readings which could lead to possible electric shock or personal injury replace the battery as soon as the battery indicator appears Charge indicator The Meter is in the auto range mode in which the Meter automatically selects the range with the best resolution Data hold is active 5 The mode on which display the present value minus the stored value 6 7 8 The voltage unit when charging is on V Mode...

Page 13: ...peres V Volts The unit of voltage mV Millivolt 1 x 10 3 or 0 001 volts No Symbol Meaning Ω kΩ MΩ mV V 13 9 The continuity buzzer is on Test of diode 10 11 µF nF F µF nF Farad The unit of capacitance Microfarad 1 x 10 6 or 0 000001 farads Nanofarad 1 x 10 9 or 0 000000001 farads Hz kHz MHz Hertz The unit of frequency in cycles second Kilohertz 1 x 103 or 1 000 hertz Megahertz 1 x 106 or 1 000 000 h...

Page 14: ...urement The AC voltage ranges are 4 000V 40 00V 400 0V and 750 0V To measure AC Voltage connect the Meter as follows 1 Insert the red test lead into the HzVΩ terminal and the black test lead into the COM terminal 2 Set the rotary switch to V and press SELECT button to select AC measurement mode 3 Connect the test leads across with the object being measured The measured value shows on the display w...

Page 15: ...lows 1 Insert the red test lead into the HzVΩ terminal and the black test lead into the COM terminal 2 Set the rotary switch to V DC measurement is default or press SELECT button to select DC measurement mode 3 Connect the test leads across with the object being measured The measured value shows on the display Note l At 400mV range the Meter has an input impedance of 4000MΩ Except at 400mV range a...

Page 16: ...arge all the high voltage capacitors before measuring resistance diodes continuity capacitance For testing capacitance use the DC Voltage function to confirm that the capacitor is discharged Resistance Measurement see figure 4 The resistance ranges are 400 0Ω 4 000kΩ 40 00kΩ 400 0kΩ 4 000MΩand 40 00MΩ To measure resistance connect the Meter as follows 1 Insert the red test lead into the HzVΩ termi...

Page 17: ...ative value function button RESET to automatically subtract the value measured when the testing leads are short circuited from the reading l For high resistance measurement 1MΩ it is normal taking several seconds to obtain a stable reading l IfΩ reading with shorted test leads is not 0 5Ω check for loose test leads incorrect function selection or enabled Data Hold function l The LCD displays OL in...

Page 18: ...ead into the HzVΩ terminal and the black test lead into the COM terminal 2 Set the rotary switch toΩ and press SELECT button to select measurement mode 3 For forward voltage drop readings on any semiconductor component place the red test lead on the component s anode and place the black test lead on the component s cathode The measured value shows on the display Note l In a circuit a good diode sh...

Page 19: ...see figure 6 To test for continuity connect the Meter as below 1 Insert the red test lead into the HzVΩ terminal and the black test lead into the COM terminal 2 Set the rotary switch toΩ and press SELECT button to select measurement mode 3 The buzzer does not sound if the circuit is disconnected with resistance value is 100Ω The buzzer sounds continuously if the circuit is in good condition with r...

Page 20: ...the red test lead into the HzVΩ terminal and the black test lead into the COM terminal 2 Set the rotary switch toΩ and press SELECT button to select measurement mode The existing of the Meter built in equalized capacitance will affect the accuracy To increase the accuracy of capacitance measurement press button before measuring to make the LCD display 0 3 Connect the test leads across with the obj...

Page 21: ...ompleted disconnect the connection between the testing leads and the circuit under test C Frequency Measurement see figure 8 Warning To avoid harms to you please do not attempt to input frequency voltage being tested higher than 30V The measurement ranges are from 10Hz to 10MHz To measure frequency connect the Meter as follows 1 Insert the red test lead into the HzVΩ terminal and the black test le...

Page 22: ...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 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 current measurement has 3 measurement positions on the rotary switch µA A and mA TheµA has a 400 0µA ...

Page 23: ...n AC current is displayed as an mean value calibrated against sine wave effective value 5 Break the current path to be tested Connect the red test lead to the more positive side of the break and the black test lead to the more negative side of the break 6 Turn on power to the circuit The measured value shows on the display Note l For safety sake the measuring time for high current should be less t...

Page 24: ...age to the Meter please do not attempt to changeover the rotary switch during charging To set up charging as follows l Charge at 220V AC 1 Insert the red test lead into the HzVW terminal and the black test lead into the COM terminal 2 Set the rotary switch to 230V MAX 3 Insert the test leads probe tip into the 220V AC power supply respectively 4 CHARGE shows on the display 5 The charging time is a...

Page 25: ...rrent charging voltage l When power charging has been completed disconnect the connection between the testing leads and the supply power Model UT90C OPERATING MANUAL l Charge at 12 36V 1 Insert the red test lead into the HzVΩ erminal and the black test lead into the COM terminal 2 Set the rotary switch to 12 36V 3 Place the test leads probe tip onto the 12 36V power supply respectively 4 CHARGE sh...

Page 26: ...ition is as follows l Relative value present value stored value For instance if the stored value is 20 0V and the present measurement value is 22 0V the reading would be 2 0V If a new measurement value is equal to the stored value then display 0 0V To enter or exit mode l Use rotary switch to select the measurement function before selecting RESET If measurement functions change manually after RESE...

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Page 29: ...29 General Specifications 2 l Safety Compliances IEC61010 CAT II 1000V CAT III 600V overvoltage and double insulation standard l Certification Model UT90C OPERATING MANUAL ...

Page 30: ...e of sine wave mean value response B DC Voltage Remark l Input impedance At 400mV range above 4000MΩ All other ranges approx 10MΩ A AC Voltage 4V 40V 400V 750V 1mV 10mV 100mV 1V Range Resolution 1 5 Overload Protection Accuracy 1 2 5 1000V DC or 750VAC continuous Accuracy Specification 1 400mV 4V 40V 400V 1000V 0 1mV 1 mV 10 mV 100mV 1V Range Resolution Overload Protection Accuracy 0 8 3 1000V DC ...

Page 31: ...0Vp 1 2 2 1 5 2 1 2 2 Remarks l Open circuit voltage approx 0 45V D Diode Continuity 1mV 1Ω Range Resolution Overload Protection 600Vp E Capacitance Test Range Resolution Overload Protection Accuracy 40nF 400nF 4µF 40µF 100µF 10pF 100pF 1nF 10nF 100nF 3 5 600Vp 3 10 4 5 Accuracy Specification 2 Model UT90C OPERATING MANUAL ...

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Page 34: ...er 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 high...

Page 35: ...the Meter use specified fuses ONLY in accordance with the following procedure Maintenance 2 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 UT90C OPERATING MANUAL ...

Page 36: ...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 UT90C OPERATING MANUAL ...

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