UNI-T UT39A Operating Manual Download Page 23

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E. Resistance Test

Range Resolution

(0.8%+3)

Overload

Protection

250V DC

or AC rms

Accuracy

UT39A UT39B UT39C

200

Ω

20k

Ω

200k

Ω

20M

Ω

200M

Ω

0.1

Ω

100

Ω

10k

Ω

100k

Ω

Remark:

Open circuit voltage:

At 200M

Ω

range: approx. 3V

Other ranges: 700mV

At 200M

Ω

range, test lead is in short circuit, and it is

normal to display 10 digits. During measurement,
subtract the 10 digits from the reading.

(0.8%+1)

(1%+2)

[5%(reading-10)+10]

F. The Model UT39C: Frequency

Range Resolution

(2%+5)

Overload Protection

250V AC

Accuracy

2kHz

20kHz

1Hz

10Hz

(1.5%+5)

Remark:

Input Sensitivity: 200mV.
When the input voltage is 30V rms, no guaranteed
accuracy.

l
l

G. The Model UT39C: Temperature

Range

Resolution

(4%+4)

Overload Protection

250V AC

Accuracy

-40

C~0

C~400

401

C~1000

(2%+8)

(3%+10)

Model UT39A/B/C: OPERATING MANUAL

Summary of Contents for UT39A

Page 1: ...E Measuring Resistance F Frequency Measurement The Model UT39C only G TemperatureMeasurement TheModelUT39Conly H Capacitance Measurement I Measuring Diodes Continuity J Measuring Transistor Sleep Mode General Specifications Accuracy Specifications A DC Voltage B AC Voltage C DC Current D AC Current E Resistance Test F Frequency The Model UT39C only G Temperature The Model UT39C only H Capacitance ...

Page 2: ...24 24 25 25 25 26 PAGE I Diodes and Continuity Test J Transistor Test Maintenance A General Service B Replacing the Battery C Replacing the Fuses Model UT39A B C OPERATING MANUAL 2 ...

Page 3: ...r not only can measure AC DC Voltage AC DC Current Resistance Capacitance Temperature Transistor Frequency Diodes and Continuity but also has Data Hold and Sleep Mode features The Meter comes with a holster which can provide sufficient and anti shaking Unpacking Inspection Open the package case and take out the Meter Check the following items carefully to see any missing or damaged part Item Descr...

Page 4: ...ABLE EQUIPMENT etc with smaller transient voltage overvoltages than CAT III 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 identifies the information that user should pay attentio...

Page 5: ...ted voltage as marked on the Meter between the terminals or between any terminal and grounding The rotary switch should be placed in the right position and no any changeover of range shall be made during measurement is conducted to prevent damage of the Meter When the Meter working at an effective voltage over 60V in DC or 30V rms in AC special care should be taken for there is danger of electric ...

Page 6: ... number or identical electrical specifications replacement parts The internal circuit of the Meter shall not be altered at will to avoid damage of the Meter and any accident 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 The Meter is suitable ...

Page 7: ...nion Grounding DC Direct Current Diode Continuity Test Fuse International Electrical Symbols The Meter Structure see figure 1 1 LCD Display 2 Data Hold Button 3 Transistor Jack 4 COM Input Terminal 5 Other Input Terminals 6 mA Input Terminal 7 20A 10A Input Terminal 8 Capacitance Jack 9 Rotary Switch 10 Power figure 1 7 Model UT39A B C OPERATING MANUAL ...

Page 8: ... indicated for information about the functional button operations l l l l l Display Symbols see figure 2 figure 2 Symbol hFE 0 C No 1 2 3 4 5 6 7 8 Meaning Data hold is active Indicates negative reading The battery is low Warning To avoid false readings which could lead to possible electric shock or personal injury replace the battery as soon as the battery indicator appears Unit of Transistor Cen...

Page 9: ...eter from electric shock please do not attempt to measure voltages higher than 1000V or 750V rms although readings may be obtained Take extra attention when measuring high voltages to avoid electric shock To measure DC voltage connect the Meter as follows 1 Insert the red test lead into the VΩ input terminal and the black test lead into the COM input terminal 2 Set the rotary switch to an appropri...

Page 10: ...nect the connection between the testing leads and the circuit under test l l l l B AC Voltage Measurement see figure 3 with dotted line Warning To avoid harms to you or damages to the Meter from electric shock please do not attempt to measure voltages higher than 1000V or 750V rms although readings may be obtained Take extra attention when measuring high voltages to avoid electric shock To measure...

Page 11: ... 10kΩ the error is negligible 0 1 or less When AC voltage measurement has been completed disconnect the connection between the testing leads and the circuit under test C DC Current Measurement see figure 4 Warning Never attempt an in circuit current measurement where the open circuit voltage between terminals and ground is greater than 60V DC or 30V rms If the fuse burns out during measurement the...

Page 12: ...lead into 10A or 20A terminal 3 Set the rotary switch to an appropriate measurement position in A range Note l l l l l If the value of current to be measured is unknown use the maximum measurement position 20A and 20A terminal or 10A and 10A terminal and reduce the range step by step until a satisfactory reading is obtained Replace appropriate rating fuse when the fuse is burnt Fuse specification ...

Page 13: ...uring current at 200mA below insert the red test lead into mA terminal while measuring current 200mA or above insert the red test lead into 10A or 20A terminal 3 Set the rotary switch to an appropriate measurement position in A range 4 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 ...

Page 14: ...play Note l l The test leads can add 0 1Ω to 0 3Ω of error to the resistance measurement To obtain precision readings in low resistance that is the range of 200Ω short circuit the red and black test leads beforehand and record the reading obtained called this reading as X Then use the equation measured resistance value Y X precision readings of resistance For high resistance 1MΩ it is normal takin...

Page 15: ...stance measurement has been completed disconnect the connection between the testing leads and the circuit under test l l figure 6 To measure frequency 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 an appropriate measurement position in kHz range 3 Connect the test leads across with the object be...

Page 16: ...obe into the COM terminal 2 Set the rotary switch to 0 C 3 Place the temperature probe to the object being measured The measured value shows on the display Note l l l The Meter displays 1 when there is no temperature probe connection The included temperature probe can only be measured up to 2500 C For any mesaurement higher than that the rod type temperature probe must be used instead When tempera...

Page 17: ... into the capacitance jack 2 Set the rotary switch to an appropriate measurement position in range 3 Connect the test leads across with the object being measured The measured value shows on the display Note For testing the capacitor with polarity connect the red test lead to anode black test lead to cathode When the tested capacitor is shorted or the value is overloaded the LCD display 1 To minimi...

Page 18: ...into the COM terminal 2 Set the rotary switch to 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 LCD displays the nearest value of diode forward voltage drop Note In a circuit a good diode should still produce a forward voltage drop reading of 0 5V to 0 8V however the re...

Page 19: ...ates broken circuit The buzzer may or may not sound if the resistance of a circuit under test is between 10Ω to 70Ω The LCD displays the resistance value of a circuit under test Note The LCD displays 1 indicating the circuit being tested is open When continuity testing has been completed disconnect the connection between the testing leads and the circuit under test l l J Measuring Transistor see f...

Page 20: ...type φ 5 x 20mm Fused Protection for 10A or 20A Input Terminal Un fused Range Manual ranging Maximum Display 1999 Mesaurement Speed Updates 2 3 times second Temperature Operating 00 C 400 C 320 F 1040 F Storage 100 C 500 C 140 F 1220 F Relative Humidity 75 00 C 300 C 50 310 C 400 C Altitude Operating 2000m Storage 10000m Battery Type 9V NEDA1604 or 6F22 or 006P Battery Deficiency Display Data Hold...

Page 21: ...DC or AC rms 1000V DC or 750V AC Remark Input impedance 10MΩ Accuracy UT39A UT39B UT39C 200mV 2V 20V 200V 1000V 100µV 1mV 10mV 100mV 1V 0 8 2 B AC Voltage Range Resolution 0 8 3 Overload Protection 1000V DC or 750V AC Remark Accuracy UT39A UT39B UT39C 2V 20V 200V 750V 1mV 10mV 100mV 1V 1 2 3 l Input impedance 10MΩ Frequency response 40Hz 400Hz Display effective value of sine wave mean value respon...

Page 22: ...asurement voltage drop Full range at 200mV l l l D AC Current Range Resolution 1 3 Overload Protection 0 315A 250V fast type fuse φ 5 x 20mm Un Fused Accuracy UT39A UT39B UT39C 200µA 2mA 20mA 200mA 10A 20A 0 1µA 1µA 10µA 100µA 10mA 3 5 Remark UT39A UT39B At 10A Range For continuous measurement 10 seconds and interval not less than 15 minutes UT39C At 20A Range For continuous measurement 10 seconds...

Page 23: ...mal to display 10 digits During measurement subtract the 10 digits from the reading l l 0 8 1 0 8 1 0 8 1 1 2 5 reading 10 10 F The Model UT39C Frequency Range Resolution 2 5 Overload Protection 250V AC Accuracy 2kHz 20kHz 1Hz 10Hz 1 5 5 Remark Input Sensitivity 200mV When the input voltage is 30V rms no guaranteed accuracy l l G The Model UT39C Temperature Range Resolution 4 4 Overload Protection...

Page 24: ...rox 400Hz 40mV rms l I Diodes and Continuity Test Function Diode Continuity Buzzer RangeResolution 1mV 1 Input Protection 250V DC or AC Remark Open circuit voltage approx 2 8V Approx 70 buzzer beeps continuously J Transistor Test Range hFE Remarks Can measure NPN or PNP transistor Display range 0 1000 Testing Conditions Vce 2 8V I bo 10µA 24 ...

Page 25: ...cloth and mild detergent Do not use chemical solvent To clean the terminals with cotton bar with detergent as dirt or moisture in the terminals can affect readings Press the Meter power off when it is not in use and take out the battery when not using for a long time Do not store the Meter in place of humidity high temperature explosive inflammable and strong magnetic field l l l l B Replacing the...

Page 26: ...ing the Fuses see figure 11 figure 11 SCREW Warning To avoid electrical shock or arc blast or personal injury or damage to the Meter use specified fuses ONLY in accordance with the following procedure To replace the Meter s fuse 1 Disconnect the connection between the testing leads and the circuit under test and remove the testing leads away from the input terminals of the Meter 2 Press the Meter ...

Page 27: ...n the bracket 0 315A 250V fast type fuse φ 5 x 20mm 8 Rejoin the case bottom and the case top and install the screw 9 Rejoin the battery door from the battery compartment and install the screw 10 Rejoin the holster and the Meter Replacement of fuses is seldom required Burning of a fuse always results from the improper operation END This operating manual is subject to change without notice Model UT...

Page 28: ...Dong Fang Industrial Development District Hu Men Town Dongguan City Guang Dong Province China Postal Code 523 925 Headquarters Uni Trend Group 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 com 28 Model UT39A B C OPERATING MANUAL ...

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