Unit UT56 Manuale utente
Contents
A. Your Meters Feature
B. Specifications
C. Making Measurements
D. Maintenance
E. Accessories
F. Using Holster
G. Using Strap
Introduction
UT56 is one type of UNI-T brand new UT50 series
Multimeters with 4 1/2 digits, which has steady
function and is a 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 can measure DC current, AC current, DC
Voltage, AC Voltage, Resistance, Capacitance,
Diode, Transistor, Frequency and Continuity Beeper,
which is an ideal measuring tool for users.
Model UT56: OPERATING MANUAL
1
Safety Rules
l Use the Meter only as specified in this
manual, otherwise the protection provided
by the Meter may be impaired.
l Do not operate the Meter before the cabinet
has been closed and screwed safely as
terminalcan carry voltage.
l Make sure before each measurement the
Meter is set to the suitable range.
l Before using the Meter, please inspect
the cabinet and test leads for damaged
insulation or exposed metal.
l Connect the red and black test lead to the
correct measuring input jack properly.
l Do not input values over the maximum range
of each measurement to avoid damages of
the Meter.
l Do not turn the rotary function switch during
Voltage and Current measurement, otherwise
the Meter could be destroyed .
l Make sure to use new fuses with proper
rating in stead of bad fuses.
l To avoid electric shock or damages, do not
apply more than 1000V between the"COM"
terminals and ""earth ground.
l Use caution when working with Voltages
above 60V (DC) or 30Vrms (AC). These
Voltages pose shock hazard.
Model UT56: OPERATING MANUAL
2
Low Battery Earth Ground
Safety Rules Double Insulated
AC Diode
Dangerous Voltages
DC Buzzer
Fuse
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 Turn off the Meter once finished measuring.
Fetch out the battery, when the meter will
not be used for long period.
l Do not operate the Meter under adverse
environmental condition including high
temperature and especially humid area as
the Meter's function may be effected after
moisturizing.
l To avoid damages and dangerous, do not
change the circuit on your own.
l Periodically wipe the cabinet with a damp
cloth and mid detergent. Do not use
abrasives or solvents.
l Dispose the used battery proper.
l International Electrical Symbols.
Model UT56: OPERATING MANUAL
3
A. Your Meters Feature
“ ”
“ ”
Model UT56: OPERATING MANUAL
4
B-3 Direct Current Current (DC Current)
2mA
20mA
200mA
20A
0.1µV
1µV
10µV
1mV
Range Resolution
(0.8% +5)
Accuracy
(2% +10)
(0.5% +5)
Overload protection: Below 200mA with 0.3
A/250V Fused. No fuse protection on 20A.
Max current input: 20A(above 10Afor 15 seconds
maximum).
Measuring voltage drop: Full ranges are 200mV.
B-4 Alternate Current Current (AC Current)
2mA
20mA
200mA
20A
0.1µV
1µV
10µV
1mV
Range Resolution
(1.2% +10)
Accuracy
(2.5% +10)
(0.8% +10)
Overload protection: Below 200mA with0.3A/
250V Fused. No fuse protection on 20A.
Max current input:20A(above 10Afor 15seconds
maximum).
Measuring voltage drop: Full ranges are 200mV
Display: Average value(RMS of Sine Wave).
Model UT56: OPERATING MANUAL
6
7
B-5 Resistance
200Ω
2KΩ
20KΩ
200KΩ
2MΩ
20MΩ
200MΩ
0.01Ω
0.1Ω
1Ω
10Ω
100Ω
1KΩ
10KΩ
Range Resolution Accuracy
(0.3% +1)
(0.5% +10)
(0.5% +1)
[5.0%(-1000) +10]
(0.3% +3)
Overload protection: All ranges are 250VDC
or AC RMS.
Caution:
1) At 200MΩrange, test lead is short circuit, the
LCD display 1000 digits, deduct the 1000
digits from the measured reading during
measuring.
2) At 200Ωrange, short the test lead first to display
the resistance value of the test leads. Deduct
that resistance value from the measured reading
to obtain the being measured object correct
value .
B-6 Capacitance
Testing Signals: About 400Hz, 40mVrms.
2nF
20nF
200nF
2µF
20µF
0.1pF
1pF
10pF
0.1nF
1nf
Range Resolution Accuracy
(4% +20)
Model UT56: OPERATING MANUAL
2-7 Frequency
Range Resolution Accuracy
20kHz 1Hz(1.5% +5)
Input sensitivity: <200mVrms, Max. input
scope 30Vrms.
Overload protection: 250Vrms.
2-8 Diode and Continuity Beeper
Overload protection: 250V DC orAC RMS.
B-9 Transistor hFE test
Range Remark Measuring Condition
Display Diode
Forward Voltage
Value, unit is "V"
Forward DC Current abt
1mA, Backward DC
Voltage abt3.0V
Beeper sounds when
Resistance < 50Ω.
Display the nearest
value, unit is "kΩ"
Voltage at open Circuit
abt 3.0V
Range Remark Measuring Condition
hFE Can Measure NPN
and PNP type
Transistor, Display
ranges: 0-1000 β
Basic polarity current abt
10µA,Vce abt 3.0V
Model UT56: OPERATING MANUAL
8
C. Making Measurements
Caution:
1On/Off Switch 2Capacitance jack
3Liquid Crystal Display 4Date Hold Switch
5Rotary switch 6Transistor jack
7Input jack
(1) If there is no display or is shown on the
LCD when the Meter is switched on, replace
the battery ASAP.
(2) Never exceed the maximum input voltage or
current limits shown besides the input jacks
, otherwise the Meter will be damaged
and this is dangerous to life.
(3) Turn the rotary switch to proper range before
operating.
“ ”
“ ”
Model UT56: OPERATING MANUAL
9
C-1 Measuring DC Voltage
1. Connect the black test lead to COM jack and
red test lead to Vjack.
2. Set the rotary switch to V .
3. Connect the test leads across with the object
to be measured. LCD appears the measured
value and also the polarity of the red test leads.
“ ”
“ ”
Caution
1) If magnitude of the voltage is unknown, always
start with the highest range and reduce until
satisfactory reading is obtained.
2) If 1is shown on the LCD, which means the
Meter is overloaded, then set the measuring
range to higher.
3) means never exceed the maximum input
limit 1000V, otherwise internal circuit of the
Meter will be damaged.
4) Take extra care of voltage leakage when
measuring high voltage.
C-2 Measuring AC Voltage
“ ”
“ ”
1. Connect the black test lead to COM jack
and red test lead to Vjack.
2. Set the rotary switch to V~ .
3. Connect the test leads across with the object
to be measured.
“ ”
“ ”“ ”
Caution
1) Refer to DC Voltage Caution 1, 2, 4.
2) means never exceed the maximum input
limit 750V, otherwise internal circuit of the
Meter will be damaged.
“ ” “ ”
“ ”
Model UT56: OPERATING MANUAL
10
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