UNI-T UT58A, UT58B, UT58C Operating Manual
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Table of Contents
Title Page
Overview
Unpacking Inspection
Safety Information
Rules For Safe Operation
International Electrical Symbols
The Meter Structure
Rotary Switch
Functional Buttons
Display Symbols
Measurement Operation
A. DC and AC Voltage Measurement
B. DC and AC Current Measurement
C. Measuring Resistance
D. Measuring Diodes
E. Testing for continuity
F. Capacitance measurement
G. Temperature Measurement
(UT58B/UT58C only)
H. Measuring Transistor
I. Frequency Measurement (UT58C only)
Sleep Mode
Operation of Hold Mode
General Specifications
Accuracy Specifications
A. DC Voltage
B. AC Voltage
C. DC Current
D. AC Current
E. Resistance Test
F. Diodes Test
G. Continuity Test
H. Capacitance
I. Temperature (UT58B/UT58C only)
J. Transistor Test
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Model UT58A/B/C: OPERATING MANUAL
Title Page
K. Frequency (UT58C only)
Maintenance
A. General Services
B. Replacing the Fuses
C. Replacing the Battery
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Model UT58A/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 UT58A, UT58B and UT58C
(hereafter referred to as “the Meter”) are 3 1/2 digits with
ex-large LCD, steady operations, fashionable structure
and highly reliable hand-held measuring instrument. The
Meter uses large scale of integrated circuit and has full
range overload protection. The Meter not only can
measure AC/DC Voltage, AC/DC Current, Resistance,
Capacitance, Temperature, Frequency, T ransistor, Diode
and Continuity , but also have Data Hold, Full Icon Display,
Overload Protection and Sleep Mode features.
Model UT58A/B/C: OPERATING MANUAL
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Unpacking Inspection
In the event you find any missing or damage, please
contact your dealer immediately.
1 English Operating Manual
2 Test Lead
3 Multi-Purpose Socket
4 Point Contact Temperature Probe
(UT58B/UT58C only)
5 9V Battery (NEDA 1604, 6F22 or 009P)
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Model UT58A/B/C: OPERATING MANUAL
Item
Description
Qty
1 piece
1 pair
1 piece
1 piece
1 piece
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, PORTABLE 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 to.
International electrical symbols used on the Meter and
in this Operating Manual are explained on page 8.
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Model UT58A/B/C: OPERATING MANUAL
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:
l 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.
l 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.
l Do not apply more than the rated voltage, as
marked on the Meter, between the terminals or
between any terminal and grounding.
l 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.
l 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.
l Use the proper terminals, function, and range
for your measurements.
l If the value to be measured is unknown, use the
maximum measurement position and reduce the
range step by step until a satisfactory reading is
obtained.
l 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.
Rules For Safe Operation (1)
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Model UT58A/B/C: OPERATING MANUAL
Rules For Safe Operation (2)
l When using the test leads, keep your fingers
behind the finger guards.
l Disconnect circuit power and discharge all high
-voltage capacitors before testing resistance,
continuity, diodes, capacitance or current.
l Before measuring current, check the Meter’s
fuses and turn off power to the circuit before
connecting the Meter to the circuit.
l 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.
l Remove test leads, test clips and temperature
probe from the Meter and turn the Meter power
off before opening the Meter case.
l When servicing the Meter, use only the same
model number or identical electrical specifications
replacement parts.
l The internal circuit of the Meter shall not be altered
at will to avoid damage of the Meter and any
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 The Meter is suitable for indoor use.
l Turn the Meter power off when it is not in use
and take out the battery when not using for a long
time.
l 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 UT58A/B/C: 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.
Model UT58A/B/C: OPERATING MANUAL
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(figure 1)
The Meter Structure (see figure 1)
1. LCD Display.
2. HOLD Button.
3. Rotary Switch.
4. Input Terminals.
5. POWER
Model UT58A/B/C: OPERATING MANUAL
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Functional Buttons
Below table indicated for information about the functional
button operations.
POWER
(Yellow
Button)
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.
Button Operation Performed
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