UNI-T UT58D Operating Manual

Overview
Warning
To avoid electric shock or personal injury, read the
"Safety Information" carefully before using the
Meter.
Digital Multimeter Model UT58D is a 2000-count hand
-held instrument with remarkable features: ex-large
LCD, steady operations, overload protection for all
ranges and unique structure. It is designed with large
-scale integrated circuits and dual integral A/D converter
as the core, which offers 28 measuring ranges and can
measure AC/DC voltage, AC/DC current, resistance,
capacitance, inductance, transistor, diode and continuity.
It is also equipped with data hold, full icon display and
sleep mode functions,etc;
Unpacking Inspection
Open the package case and take out the Meter. Check
the following items carefully for any missing or
damaged part:
Item Description Qty
1 English Operating Manual 1 pc
2 Test Lead 1 pair
3 Multi-Purpose Socket 1 pc
1 pair
4 Test Clip
1 pc
5 Holster
6 9V Battery (NEDA 1604, 6F22 or 009P) 1 pc
In the event you find any missing or damaged part,
please contact your dealer immediatel y.
Safety Information
This Meter complies with the standard IEC61010:
Pollution Degree 2; Overvoltage Category; (CAT. II 1000V,
CAT. III 600V) and Double Insulation;
CAT. 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.
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:
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.
If the value to be measured is unknown, use the
maximum measurement position and reduce the
range stop by step until a satisfactory reading is
obtained.
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 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 and multi-purpose socket from
the Meter and turn the Meter power off before
opening the Meter case.
When servicing the Meter, use the replacement parts
with the same model or identical electrical specifica
-tions.
To avoid any damage to the meter or any accident,
do not alter the internal circuit of the Meter randomly.
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.
International Electrical Symbols
AC (Alternating Current).
DC (Direct Current).
Grounding.
Double Insulated.
Low Battery Indication.
Warning. Refer to the Operating Manual.
Diode.
AC or DC.
Fuse.
Continuity Test.
Conforms to Standards of European Union.
The Meter Structure
(See Figure 1)
1 LCD Display
2 POWER
3 HOLD Button.
4 Rotary Switch
5 COM Input Terminal
6 20A Input Terminal
7 mA Input Terminal
( Figure 1)
8 Other Input Terminal.
Rotary Switch
Below table indicated for information about the
rotary switch positions.
DC voltage measurement.
AC voltage measurement.
Transistor Test
AC Current Measurement
DC Current Measurement
Fcx Capacitance Test
HLx Inductance Test
Diode test
Continuity test
Resistance measurement.
Functional Buttons
Below table indicated for information about the functional
button operations
Description
POWER Turn the Meter on and off.
( Ye l l o w
Press down the POWER to turn on the
B u t t o n )
Meter.
Press up the POWER to turn off the
Meter.
HOLD Press HOLD once to enter hold mode.
(Blue Press HOLD again to exit hold mode.
Button) In Hold mode, is displayed and the
present value is shown.
Display Symbols
(See Figure 2)
( Figure 2)
No. Symbol Description
The battery is low.
Warning: To avoid false
1
readings, replace the battery as
soon as the battery indicator
appears.
2 Warning Symbol.
Indicator for AC voltage or current.
AC
3
The displayed value is the mean
value.
Indicates negative reading.
4
5 Test of diode.
6 The continuity buzzer is on.
Date hold is active.
7
Indicator of connecting test leads
8
into different input terminals.
Connect
Terminal
9
hFE The Unit of Transistor Test
A: Amperes (amps). The unit of
mA, A
current.
-3
mA: Milliamp. 1 x 10 or 0.001
amperes.
V: Volts. The unit of voltage.
-3
mV: Millivolt. 1 x 10 or 0.001 volts.
10-15
H: Henry. The unit of Inductance.
mH, H -3
mH: Millihenry. 1 x 10 or 0.001
henry.
Measurement Operation
A. Measuring DC and AC Voltage(See Figure 3)
Black Red
( Figure 3)
The DC Voltage ranges are: 200mV, 20V, 200V and 1000V.
The AC Voltage ranges are: 2V, 200V and 1000V
To measure DC&AC Voltage, connect the Meter as follows:
1. Insert the red test lead into theV input terminal
and the black test lead into the COM input terminal.
2. Set the rotary switch to an appropriate measurement
position in V or V range.
3. Connect the test leads parallel across with the object
to be measured.
The measured value shows on the display.
Note
If the value of voltage to be measured is unknown,
use the maximum measurement position (1000V)
and reduce the range step by step until a satisfactory
reading is obtained.
The LCD displays "1" indicating the existing selected
range is overloaded, it is required to select a higher
range in order to obtain a correct reading.
In each range, the Meter has an input impedance of
approx. 10M This loading effect can cause
measurement errors in high impedance circuits. If the
, the
circuit impedance is less than or equal to 10 k
error is negligible (0.1% or less).
When voltage measurement has been completed
disconnect the connection between the testing leads
and the circuit under test, and remove the testing
leads away from the input terminal of the Meter.
B. Measuring DC and AC Current (See Figure 4)
Black Red
( 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 Meter
may be damaged or the operator himself may be hurt.
Use proper terminals, function, and range for the
measurement. When the testing leads are connected
to the current terminals, do not parallel them across
any circuit.
The DC Current ranges : 2mA, 200mA and 20A
The AC Current ranges : 2mA, 200mA and 20A
To measure current, do the following:
1. Turn off power to the circuit. Discharge all high-voltage
capacitors.
2. Insert the red test lead into the 20A or mA input
terminal and the black test lead into the COM terminal.
When you measure current below 200mA, please insert
the red test lead into the mA input terminal. When you
measure 200mA or above, insert the red test lead into
the 20A input terminal.
3. Set the rotary switch to an appropriate measurement
position in A or A range.
4. Break the current path to be tested. Connect the red
test lead in serial to the more positive side of the break
and the black test lead to the more negative side of
the break.
5. Turn on power to the circuit.
The measured value shows on the display.
Note
If the value of current to be measured is unknown,
use the maximum measurement position, and reduce
the range step by step until a satisfactory reading is
obtained.
For safety sake, the measuring time for high current
should be less than 10 seconds and the interval time
between 2 measurements should be greater than 15
minutes
When current measurement has been completed,
disconnect the connection between the testing leads
and the circuit under test, and remove the testing leads
away from the input terminal of the Meter
C. Measuring Resistance
(See Figure 5)
Black Red
( Figure 5)
Warning
To avoid damages to the Meter or to the devices under
test, disconnect circuit power and discharge all the
high-voltage capacitors before measuring resistance.
1. Insert the red test lead into the V input terminal and
the black test lead into the COM terminal.
2. Set the rotary switch to an appropriate measurement
position in range.
3. Connect the test leads with the object being measured
in parallel.
The measured value shows on the display.
Note
The test leads can add 0.1 to 0.3 of error to the low
To obtain accurate readings in low-resistance, short-circuit
the input terminals beforehand and record the reading
obtained (called this reading as X). (X) is the additional
resistance from the test lead.
Then use the equation:
measured resistance value (Y) - (X) = accurate readings
of resistance.
For high resistance (>1M ), it is normal taking several
seconds to obtain a stable reading..
When there is no input, for example in open circuit
condition, the Meter displays "1".
When resistance measurement has been completed,
disconnect the connection between the testing leads
and the circuit under test, and remove the testing leads
away from the input terminal of the Meter.
D. Testing Diodes and Continuity (See Figure 6)
Black Red
( Figure 6)
Warning
To avoid damage to the Meter or to the equipment
under test, disconnect circuit power and discharge
all high-voltage capacitors before measuring diodes.
To avoid harms to you, never attempt to input