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Model UT90C: OPERATING MANUAL

Check the following items carefully to see any
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Item

Description

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Operating Manual

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Test Lead

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certificate

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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.

Use the Meter only as specified in this operating
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.

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 XXX.

Summary of Contents for 121416

Page 1: ...tion A AC DC Voltage Measurement B AC DC Current Measurement C Resistance Measurement D Diodes Measurement E Continuity Measurement F Capacitance Measurement G Frequency Measurement H Built in Power Deficiency Charge General Specifications Accuracy Specifications A DC Voltage B AC Voltage C DC Current D AC Current E Resistance F Capacitance Test G Frequency Test H Diodes Test I Continuity Test Fus...

Page 2: ...abilize functions safety operations and reliable performance In addition to the conventional measuring function such as DC AC voltage resistance capacitance frequency diode relative measurement Data Hold and continuity it is equipped with advanced design of charge through 220V AC or 9 12V AC or DC or solar energy With such design and its recycled package the Meter can obtain energy without battery...

Page 3: ...ing and test equipment and IEC61010 1 in pollution degree 2 overvoltage category CAT II 1000V CAT III 600V and double insulation Use the Meter only as specified in this operating 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 ide...

Page 4: ...al Check the test leads for continuity Replace damaged test leads with identical model number or electrical specifications before using the Meter z When using the test leads keep your fingers behind the finger guards z Do not apply more than the rated voltage as marked on the Meter between the terminals or between any terminal and grounding z When the Meter working at an effective voltage over 60V...

Page 5: ...Meter use only the same model number or identical electrical specifications replacement parts z The internal circuit of the Meter shall not be altered will to avoid damage of the Meter and any accident z 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 a...

Page 6: ...eau license for measuring instrument Manufacture Conforms to Standards of European Union The Meter Structure see figure 1 LCD Display solar receiver SELECT Button Rotary Switch HOLD Button Input Terminals RESET Button LCD indicators see figure 2 AC Appear at AC measurement disappear at DC measurement Display the minus readings CHARGE Charge indicator AUTO Choose the best resolve power range in the...

Page 7: ...MHz Frequency unit MV V Voltage unit µA mA A Current unit Rotary Switch Below table indicated for information about the rotary switch positions Rotary Switch Positio n Function DC voltage measurement range from 400 0mV to 1000V AC voltage measurement range from 4 000V to 750V Ω ΩResistance measurement range from 400 0Ω to 40 00MΩ Diode test Capacitance test Continuity test Hz Frequency measurement...

Page 8: ...ent range from 400 0µA to 20 00A CHARGE Charge 230V MAX AC 220V input charge 9 12 9 12 input charge OFF Turn off the Meter Functional Buttons Below table indicated for information about the functional button operations Button Measur ing Functi Operation Performed ...

Page 9: ...orange turn the rotary switch from the beginning to the end and back to the beginning one time only fit the Autorange function RESET BUTTON CHAR GE Reversion Button When the built in power is deficiency the display will shut off At the first time to start up the LCD during charge it is necessary to use button to make the Meter display the exact present charge voltage SELEC T BUTTO N Any rotary swi...

Page 10: ...of continuity test is connected the buzzer beeps continuously AUTO POWE R OFF Any rotary switch position When there is not any operation of the Meter all the indicators on the LCD will disappear the Meter will enter sleep mode Any operation of rotary changover or pressing button will wake up the Meter to work again When press SELECT BUTTON to start up the Meter the function of AUTO POWER OFF will ...

Page 11: ...Set the rotary switch to and connect the test leads across with the power or load being measured 3 The measured value shows on the display which is an effective value of sine wave mean value response 4 In each range the Meter has an input impedance of 10MΩ except the input impedance is about above 4000MΩ in the 400mV range This loading effect can cause measurement errors in high impedance circuits...

Page 12: ...re time should 10 seconds and the time between two measurements should 15 minutes The measurement ranges of current are 400 0µA 4000µA 40 00mA 400 0mA 4 000A and 20 00A To measure current do the following 1 Insert the red test lead into the µA mA or 20A terminal and the black test lead into the COM terminal 2 Set the rotary switch to µA mA or A press SELECT AC or DC and connect the test leads acro...

Page 13: ...ent 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 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 Hz VΩterminal and the black test lead into the COM terminal 2 Set the rotary switch toΩ press SELECT button to choose Ω r...

Page 14: ...d 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 5Ωin the shorten circuit please check for loose test leads or choose the wrong range or if start up the HOLD mode z For high resistance measurement 1MΩ it is normal taking several seconds to obtain a stable...

Page 15: ...d test lead anode into the Hz VΩterminal and the black test lead cathode into the COM terminal 2 Set the rotary switch toΩ press SELECT button to choose range Then place the red test lead on the component s anode and place the black test lead on the component s cathode 3 For forward voltage drop readings on any semiconductor component the measured value shows on the display Note z In a circuit a g...

Page 16: ...t 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 Insert the red test lead into the Hz VΩterminal and the black test lead into the COM term...

Page 17: ...y please turn off power of the circuit and discharge all capacitors z Open circuit voltage of continuity measurement is about 0 45V z When continuity testing has been completed disconnect the connection between the testing leads and the circuit under test F Capacitance Measurement see figure 8 Warning To avoid injury to the user please do not attempt the voltage higher than 60V DC or 30V AC To avo...

Page 18: ...est leads across with the capacitor being measured 3 The measured value shows on the display Note z The LCD will display OL indicating that the capacitor under test is in short circuit or the capacity under test is higher than the range of the Meter z Discharge all capacitors before measure z To measure online capacitance please turn off power of the circuit and discharge all capacitors z If the c...

Page 19: ...e Meter as below 1 Insert the red test lead into the Hz VΩ terminal and the black test lead into the COM terminal 4 Set the rotary switch to Hz press SELECT button to choose range Then parallel connect the test leads across with the object being measured 5 The measured value shows on the display Note z When making frequency measurement please mind the input sensitivity as follows 1MHz 300mV input ...

Page 20: ...et the rotary range to 230 V MAX position then insert the test leads into the 220 V Power plug to start the charge 2 9 12 low voltage power charge Insert the red test lead into the Hz VΩ terminal and the black test lead into the COM terminal set the rotary range to 9 12 position then insert the test leads into the 9 12 Power plug to start the charge 3 Solar energy charge Charge through the solar e...

Page 21: ...harge has been completed disconnect the connection between the testing leads and the supply power General Specifications z Maximum Voltage between any Voltage Input Terminals and COM Terminal 1000Vp z Fuse protection of µA mA terminal 500mA 250V fast melt fuse z Fuse protection of 20A terminal 20A 600V fast melt fuse z Equipped with full icons display z Maximum Display Display 2000 z Measurement S...

Page 22: ...61010 CAT II 1000V CAT III 600V z Certification CMC 94 03000148 Accuracy Specifications Accuracy a reading b digits guarantee for 1 year Operating temperature 18 28 Relative humidity 75 RH A DC Voltage Range Resolution Accuracy a reading b digits 400mV 0 1mV 0 8 3 4V 1 mV 40V 10 mV 400V 100mV 0 8 1 1000V 1V 1 0 3 Remark Input impedance about 10MΩ except 4000MΩin 400mV range Overload Protection 100...

Page 23: ...tinuously measure Frequency response 40Hz 400Hz Displays effective value of sine wave mean value response C DC Current Range Resolution Accuracy a reading b digits 400µA 0 1µA 4000µA 1µA 1 0 2 40mA 10µA 400mA 0 1mA 1 2 3 4A 1mA 20A 10mA 1 5 5 Remarks Overload Protection AtµA mA range Fuse 5 20mm F0 5A 600V At A range Fuse 6 25mm F20A 600V continuous measure time 10 seconds time between two measure...

Page 24: ...z 400Hz Overload Protection AtµA mA range Fuse 5 20mm F0 5A 600V At A range Fuse 6 25mm F20A 600V continuous measure time 10 seconds time between two measurements 15 minutes E Resistance Range Resolution Accuracy a reading b digits 400Ω 0 1Ω 1 2 2 4kΩ 1Ω 40kΩ 10Ω 400kΩ 100Ω 1 0 2 4MΩ 1kΩ 1 2 2 40MΩ 10kΩ 1 5 2 Remarks Overload Protection 600Vp F Capacitance Test Range Resolution Accuracy a reading ...

Page 25: ... Test Range Resolu tion Accuracy a reading b digits 10Hz 10MHz 0 01Hz 10KHz 0 1 3 Remarks MAX input amplitude 1MHz 300mV MIN input amplitude 1MHz 600mV Overload Protection 600Vp H Diodes Test Range Resolution Remark 1mV Open circuit voltage is about 1 48V transistor PN normal voltage is about 0 5 0 8V Remarks Overload Protection 600Vp I Continuity Test ...

Page 26: ...uously Fuse Replacement see figure 11 Warning To avoid electrical shock or injury to the user because of wrong readings of the Meter please inspect the damage of fuse inside 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 rem...

Page 27: ... remove the case bottom make sure the power is off remove the test leads from terminals and test circuit z Periodically wipe the case with a damp cloth and a little mild detergent Do not use chemical abrasives or solvents z Please stop any operation of the Meter and sent it outside to repair or service if there is anything wrong z Do not attempt to repair of service your Meter unless you are quali...

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