UNI-T UT50D Operating Manual

1

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. Inductance Measurement
G. Capacitance Measurement
H. Temperature Measurement
I. Measuring Diodes & Continuity
Sleep Mode
Turning on the Auto Display Backlight
General Specifications
Accuracy Specifications
A. DC Voltage
B. AC Voltage
C. DC Current
D. AC Current
E. Resistance Test
F. Inductance
G. Capacitance
H. Temperature
I. Diodes and Continuity Test

Table of Contents

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Model UT50D: OPERATING MANUAL

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Maintenance
A. General Service
B. Replacing the Battery
C. Replacing the Fuses

Model UT50D: OPERATING MANUAL

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Digital Multimeters Model UT50D (hereafter referred to
as “the Meter”) is a 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,
Inductance, Diodes and Continuity, but also has Data
Hold, Full Icon Display and Sleep Mode features.

The Meter adopted advanced “co-injection” technique in
order to provide sufficient insulation and anti-shaking.
In addition, the Automatic Display Backlight feature
enables user to work in a dim condition.

Warning
To avoid electric shock or personal injury, read the
“Safety Information” and “Rules for Safety Operation”
carefully before using the Meter.

Model UT50D: OPERATING MANUAL

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1 English Operating Manual 1 piece
2 Test Lead 1 pair
3 Test Clip 1 piece
4 Point Contact Temperature Probe
5 9V Battery (NEDA 1604, 6F22 or 009P)
(installed inside the Meter)

1 piece
1 piece

Item

Description

Qty

In the event you find any missing or damage, please
contact your dealer immediately.

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Model UT50D: OPERATING MANUAL

Safety Information

This Meter complies with the standards IEC61010: in
pollution degree 2, overvoltage category (CAT. II 1000V,
CAT. III 600V) and double insulation.

CA T. II: Local level, appliance, POR TABLE EQUIPMENT
etc., with smaller transient voltage overvoltages than
CAT. III
CAT. III: Distribution level, fixed installation, with smaller
transient overvoltages than CAT. IV

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 8.

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Model UT50D: OPERATING MANUAL

Rules For Safe Operation (1)

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.

6

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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Model UT50D: OPERATING MANUAL

Rules For Safe Operation (2)

Disconnect circuit power and discharge all high

-voltage capacitors before testing resistance,
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, test clips 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 UT50D: OPERATING MANUAL

International Electrical Symbols

AC (Alternating Current).
DC (Direct Current).
Grounding.
Double Insulated.
Deficiency of Built-In Battery.
Warning. Refer to the Operating Manual.

Conforms to Standards of European Union.

Diode.
AC or DC.

Fuse.
Continuity Test.

Model UT50D: OPERATING MANUAL

8

9

(figure 1)

The Meter Structure (see figure 1)

1. LCD Display

2. Data Hold Button.

3. Rotary Switch

4. Other Input Terminals

5. COM Input Terminal

6. 20A Input Terminal

7. mA Input terminal

8. Power

Model UT50D: OPERATING MANUAL

Button Operation Performed

Turn the Meter on and off.
l Press down the POWER to turn
on the Meter.
l Press up the POWER to turn off
the Meter.

HOLD

(Blue Button)

l Press HOLD once to enter hold
mode.
l Press HOLD again to exit hold
mode.
l In Hold mode, is displayed and
the present value is shown.

POWER

(Yellow Button)

Functional Buttons

Below table indicated for information about the functional
button operations

Model UT50D: OPERATING MANUAL

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(figure 2)

Display Symbols(1) (see figure 2)

No. Symbol Meaning

1

Dangerous Voltages.

2

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.

3

Indicator for AC voltage or
current.The displayed value is the
mean value.

4

Indicates negative reading.

5

Test of diode.

6

Data hold is active.

7

The continuity buzzer is on.

8

Centigrade temperature

o

C

o

F

9

Fahrenheit temperature

10

V: Volts. The unit of voltage.
mV: Millivolt. 1 x 10-3 or 0.001 volts.

mV, V

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Model UT50D: OPERATING MANUAL

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