Unit UT51-55 Manuale utente
Contents
A Your Meters Feature
B Specifications
C Making Measurements
D Maintenance
E Accessories
F Using Holster
G Using Strap
Introduction
One kind of UNI-T brand new UT50 series
Multimeters is a 3 1/2 digit with steady function
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
can measure DC current, AC current, DC Voltage,
AC Voltage, Resistance, Capacitance, Diode,
Temperature, Frequency and Continuity, which is
an ideal tool for users.
Model UT51-55: OPERATING MANUAL
1
Safety Rules
l Do not operate the Meter before the cabinet
has been closed and screwed safely as
terminal can 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 The UNI-T UT50 series comply with
IEC 61010: in pollution degree 2,
overvoltage category (CAT I 1000V and
CAT II 600V) and double insulation.
Use the Meter only as specified in this
manual, otherwise the protection provided
by the Meter may be impaired.
l CAT I-For signal level, telecommunication,
electronic with small transient over voltage.
l CAT II -For local level, appliances, main
wall outlets, portable equipment.
l The meter is designed to withstand the
stated Max. voltages. If it’s not possible
to exclude without doubts that impulses,
transients, disturbance or for other reasons,
these voltages are exceeded a suitable
prescale (10:1) must be used.
l Do not turn the rotary function switch
during Voltage and Current measurement,
otherwise the Meter could be destroyed.
Model UT51-55: OPERATING MANUAL
2
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 especially humid
area.
l To avoid damages and dangerous, do not
change the circuit.
l Periodically wipe the case with a damp
cloth and mild detergent. Do not use
abrasives or solvents.
l International Electrical Symbols:
Low Battery Earth Ground
Safety Rules Double Insulated
AC Diode
Dangerous Voltages
DC Buzzer
Fuse
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.
l The Meter is suitable for indoor use only.
Model UT51-55: OPERATING MANUAL
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A. Your Meters Feature
l 32 ranges.
l Liquid Crystal Display, digits height is 27mm.
l Overload display l.
l Maximum display 1999 (3 1/2 digit).
l Full range overload protection.
l Auto-Power Off (For UT53, UT54 and UT55
ONLY).
l Temperature:
Operating:0oCto 40oC(32 0Fto 104 0F).
Storing:-10oCto 50oC(14 0Fto 122 0F).
l Altitude:
Operating: 2000m
Storing: 10000m.
l Relative Humidity:Max. relative humidity
80% for temperature up to 31oC decreasing
linearly to 50% relative humidity at 40oC.
l Low Battery display "".
l Strap for easy carry.
l Tilt stand design, three observation angles,
is in favor of reading display.
l Dimension: 190mm x 88mm x 34mm.
l Weight: Meter only(excluding test leads)
about 270g .Meter + holster + tilt stand
about 550g.
l Battery Type: 9V NEDA 1604 or 6F22 or 006P
Model UT51-55: OPERATING MANUAL
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B. Specifications
Accuracy is specified for one year after calibration,
at operating temperatures 23oC+/- 5oC, with relative
humidity at < 75%.Accuracy specifications take
the form of:+/- (a% readings +digits )
B-1Direct Current Voltage (DC Voltage)
Input impedance: All ranges are 10MΩ .
Overload protection: 200mV is 250VDC or AC
RMS. All other ranges is 750Vrms or 1000Vp-p.
B-2 Alternating Current Voltage (AC Voltage)
Input impedance: All ranges are 10MΩ.
Frequency: 40Hz-400Hz .
Overload protection: 200mV is 250VDC or AC
RMS. All other ranges is 750Vrms or 1000Vp-p.
Display: Average Value (RMS of Sine Wave).
200mV
2V
20V
200V
1000V
100µV
1mV
10mV
100mV
1V
Range Resolution
(0.5% +1)
UT51 UT 52 UT53 UT54 UT55
Accuracy
(0.8% +2)
200mV
2V
20V
200V
750V
100µV
1mV
10mV
100mV
1V
Range Resolution UT51 UT 52 UT53 UT54 UT55
Accuracy
(1.2% +3)
(0.8% +3)
(1.2% +3)
Model UT51-55: OPERATING MANUAL
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B-3 Direct Current Current (DC Current)
Overload protection:
20µA
200µA
2mA
20mA
200mA
2A
10A
20A
0.01µA
0.1 µA
1 µA
10µA
100 µA
1mA
Range Resolution UT51 UT 52 UT53 UT54 UT55
Accuracy
(2%+5)
(0.8%+1)
(1.5%+1 )
(0.8%+1)
10mA
(1.5%+1)
(2%+5) (2%+5 )
For UT51:
2A, 250V fast acting fuse, φ5x20mm(below
2A range)
10A, 250V fast acting fuse,φ5x20mm(at 10A
range) .
For UT52/53/54/55:
315mA, 250V fast acting fuse, φ5x20mm (No
fuse at 20A range).
Max current input :
For UT51: 10A (The measurement time
for high current should be less than 10
seconds maximum, and the interval time
between two measurements should be greater
than 15 minutes.
For UT52/53/54/55: 20A (The measurement
time for high current should be less than 15
seconds maximum, and the interval time
between two measurements should be greater
than 15 minutes.
Model UT51-55: OPERATING MANUAL
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7
B-4 Alternating Current Current (AC Current)
200µA
2mA
20mA
200mA
2A
10A
20A
0.1µA
1µA
10µA
100 µA
1mA
Range Resolution UT51 UT 52 UT53 UT54 UT55
Accuracy
(1%+3)
(1%+3)
10mA (1.8%+3)
(3%+7) (3%+7 )
(1.8%+3)
(1.8%+3)
Overload protection:
For UT51:
2A, 250V fast acting fuse, φ5x20mm(below 2A
range)
10A, 250V fast acting fuse,φ5x20mm(at 10A range) .
For UT52/53/54/55:
315mA, 250V fast acting fuse,φ5x20mm (No fuse
at 20A range).
Max current input :
For UT51: 10A (The measurement time for high
current should be less than 10 seconds maximum,
and the interval time between two measurements
should be greater than 15 minutes.
For UT52/53/54/55: 20A (The measurement time
for high current should be less than 15 seconds
maximum, and the interval time between two
measurements should be greater than 15 minutes.
Measuring voltage drop: Full range is 200mV.
Display: Average Value (RMS of Sine Wave ) .
Model UT51-55: OPERATING MANUAL
B- 6 Capacitance
Testing signal: around 400Hz 40mVrms
Range Resolution UT51 UT 52 UT53 UT54 UT55
Accuracy
(4% +3)
2nF
20nF
200nF
2µF
20µF
1pF
10pF
100pF
1nF
10nF
B-5 Resistance
200Ω
2KΩ
20KΩ
200KΩ
2MΩ
20MΩ
200MΩ
0.1Ω
1Ω
10Ω
100Ω
1KΩ
10KΩ
100KΩ
Range Resolution UT51 UT 52 UT53 UT54 UT55
Accuracy
(0.8% +1)
(0.8% +3)
(1% +2)
[5%(-10) +10]
B-7 Frequency
Range ResolutionUT51 Accuracy
UT52 UT54 UT55
UT53
2kHz
20kHz 1Hz
10Hz (2%+5)
(1.5%+5)
Voltage at open circuit: 700mV (200MΩrange,
open circuit voltage around 3V) .
Overload protection: All ranges 250VDC or AC
RMS .
Caution: At 200MΩrange, as test lead is short
circuit the LCD display 10 digits is normal, deduct
the 10 digits from the measured reading during
measuring.
Model UT51-55: OPERATING MANUAL
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Overload protection: 250V DC or AC RMS.
B-10 Transistor hFE test
Comment Measuring Condition
Range
hFE Can measure NPN or
PNP transistor hFE.
Range: 0-1000β
Basic polarity current abt
10µA,Vce abt 2.8V
B-9 Diode Test and Continuity Beeper
Comment Measuring Condition
RangeDisplay diode forward-
voltage near value,
Unit mV
Forward DC current abt
1mABackward DC voltage
abt 2.8V
Voltage at open circuit
abt 2.8V
“ ”
“ ”
B-8 Temperature
Range Resolution Accuracy
UT51,52,53 UT53 UT55
(5%+3)
(1%+3)
2%
-20oC
to
1000oC1oC
-20oC to 0oC
0oC to 400oC
400oCto
1000oC
Input sensitivity: 100mVrms.
Overload protection: 250Vrms.
Model UT51-55: OPERATING MANUAL
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C. Making Measurements
“ ”
“ ”
1On/Off Switch 2Capacitance jack
3Liquid Crystal Display 4Temperature jack
5Rotary switch 6Transistor jack
7Input jack
Model UT51-55: OPERATING MANUAL
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