UNI-T UT39A, UT39C, UT39B Operating Manual
TABLE OF CONTENTS
TITLE PAGE
Overview
Unpacking Inspection
Safety Information
Rules For Safe Operation
International Electrical Symbols
The Meter Structure
Functional Buttons
Display Symbols
Measurement Operation
A. DC Voltage Measurement
B. AC Voltage Measurement
C. DC Current Measurement
D. AC Current Measurement
E. Measuring Resistance
F. Frequency Measurement (The Model UT39C only)
G. T emperature Measurement (The Model UT39C only)
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
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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
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Overview
Warning
To avoid electric shock or personal injury, read the
“Safety Information” and “Rules for Safety Operation”
carefully before using the Meter.
Digital Multimeters Model UT39A, UT39B and UT39C
(hereafter referred to as “the Meter”) are 3 1/2 digits with
steady operations, fashionable structure and highly
reliable hand-held measuring instrument. The Meter uses
large scale of integrated circuit with double integrated
A/D converter as its core and has full range overload
protection. The Meter 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 Description Qty
English Operating Manual
Test Lead
Point Contact Temperature Probe
(UT39C only)
Holster
9V Battery (NEDA 1604 or 6F22 or 006P)
1
2
3
4
5
1 piece
1 pair
1 piece
1 piece
1 piece
In the event you find any missing or damage, please
contact your dealer immediately.
Model UT39A/B/C: OPERATING MANUAL
Safety Information
This Meter complies with the standards IEC61010: in
pollution degree 2, overvoltage category (CAT. I 1000V,
CAT. II 600V) and double insulation.
CAT. I: Signal level, special equipment or parts of
equipment, telecommunication, electronic, etc., with
smaller transient overvoltages than overvoltages CAT. II.
CA T. II: Local level, appliance, PORT 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
attention on.
International electrical symbols used on the Meter and
in this Operating Manual are explained on page 7.
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Model UT39A/B/C: OPERATING MANUAL
Rules For Safe Operation
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:
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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. Check the test leads for continuity .
Replace damaged test leads with identical model
number or electrical specifications before using
the Meter.
Do not apply more than the rated 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
shock.
Use the proper terminals, function, and range for
your measurements.
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 after
dampened.
When using the test leads, keep your fingers behind
the finger guards.
Disconnect circuit power and discharge all highvoltage capacitors before testing resistance,
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Model UT39A/B/C: OPERATING MANUAL
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continuity, diodes, capacitance or current.
Before measuring current, check the Meter’s fuses
and turn off power to the circuit before connecting
the Meter to the circuit.
Replace the battery as soon as the battery indicator
appears. With a low battery, the Meter might
produce false readings that can lead to electric
shock and personal injury.
Remove test leads and temperature probe from
the Meter and turn the Meter power off before
opening the Meter case.
When servicing the Meter, use only the same model
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 for indoor use.
Turn the Meter power off when it is not in use and
take out the battery when not using for a long time.
Constantly check the battery as it may leak when
it has been using for some time, replace the battery
as soon as leaking appears. A leaking battery will
damage the Meter.
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Model UT39A/B/C: OPERATING MANUAL
Deficiency of Built-In Battery
AC (Alternating Current)
AC or DC
Double Insulated
Warning. Refer to the Operating Manual
Conforms to Standards of European Union
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)
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Model UT39A/B/C: OPERATING MANUAL
Button
POWER
(Y ellow Button)
HOLD
(Blue Button)
Operation Performed
Turn the Meter on and off.
Press down the POWER to turn on the Meter.
Press up the POWER to turn off the Meter.
Press HOLD once to enter hold mode.
Press HOLD again to exit hold mode.
In Hold mode, is displayed and the
present value is shown.
Functional Buttons
Below table indicated for information about the functional
button operations
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Display Symbols (see figure 2)
( figure 2)
Symbol
hFE
0
C
No.
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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
Centigrade temperature
Test of diode.
The continuity buzzer is on.
Dangerous Voltages.
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Make sure the Sleep Mode is not on if you found there
is no display on the LCD after turning on the Meter.
Make sure the Low Battery Display is not on,
otherwise false readings may be provided.
Pay extra attention to the symbol which is located
besides the input terminals of the Meter before carrying
out measeurement.
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A. DC Voltage Measurement (see figure 3)
Warning
T o 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 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 appropriate measurement
position in V range.
3. Connect the test leads across with the object being
measured.
The measured value shows on the display.
( figure 3)
Black Red
Model UT39A/B/C: OPERATING MANUAL
Measurement Operation
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