Unit UT57 Manuale utente
Table of Contents
A. Your Meter’s Feature
B. Specifications
C. Making Measurements
D. Maintenance
E. Accessories
F. Using Holster
G. Using Strap
Introduction
UT57 is one type of UNI-T brand new UT50 series
Multimeters with 4 1/2 digits, which has special
and steady function and is a highly reliable hand
-held measuring instrument. The design of the
Meter is the use of CMOS technology with large
scale of integrated circuit using double integrated
A/D tranducer as its core and has full ranges overload
protection.The Meter can measure DC current,
AC current, DC Voltage, AC Voltage, Resistance,
Capacitance, Diode, Frequency and Continuity
Beeper. AC Voltage and Current measurement
is TRMS and has the function of AC+DC/AC which
is an ideal tool for users.
Model UT57: 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 The meter is designed to withstand the
stated Max. voltages. If it is 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 operate the Meter before the cabinet
has been closed and screwed safely as
terminal can carry voltage.
l Make sure the Meter is set to the suitable
range before each measurement.
l Before using the Meter, please inspect the
case 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 or Current measurement,
otherwise the Meter could be destroyed
Model UT57: OPERATING MANUAL
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l Make sure to use new fuses with proper
rating to instead 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 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.
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 dangers, do not
change the circuit.
l Periodically wipe the cabinet with a damp
cloth and mid detergent. Do not use
abrasives or solvents.
l International Electrical Symbols:
Low Battery Earth Ground
Warning Double Insulated
AC Diode
Dangerous Voltages
DC Buzzer
Fuse
Model UT57: OPERATING MANUAL
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A. Your Meter’s Feature
l 21 ranges.
l Liquid Crystal Display, digit’s height is
21mm .
l Overload display “l”.
l Maximum display “19999”.
l Full range symbol display.
l Full range overload protection.
l Auto-Power Off.
l Operating Temperature:
0oC to 40oC (32 oF to 104 oF ) .
l Storing Temperature:
-10oC to 50oC (14 oF to 122 oF) .
l Altitude:Operation:2000m.
Storage: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 Battery type:9V Zinc,NEDA1604 or 6F22
or 006P.
l Fuse:F.0.3A/250Vφ5x20mm.
F.10A/250Vφ6x25mm.
l Measuring Dangerous Voltage display“ ”
l Strap for easy carry.
l Dimension: 190 x 88 x 34mm.
l Weight: about 270gram (excluding test
leads).
Model UT57: OPERATING MANUAL
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B. Specifications
Accuracy is specified for one year after
calibration,at operating temeratures 23oC
5oC,with relative humidity at<75%.Accuracy
specifications take the form of: (a% readings
+n digits)
B-1 Direct Current Voltage (DC Voltage)
B-2 Alternate Current Voltage (AC Voltage)
200mV
2V
20V
200V
750V
10µV
100µV
1mV
10mV
100mV
Range Resolution
(0.8% +20)
Accuracy
(1.0% +50)
Model UT57: OPERATING MANUAL
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B-3 Direct Current Current (DC Current)
B-4 Alternate Current Current (AC Current)
Model UT57: OPERATING MANUAL
6
7
B-5 Resistance
200Ω
2KΩ
20KΩ
200KΩ
2MΩ
20MΩ
0.01Ω
0.1Ω
1Ω
10Ω
100Ω
1KΩ
Range Resolution Accuracy
(0.1% +2)
(0.1% +5)
(0.3% +10)
Overload protection: All ranges are 230VDC
or AC RMS.
Voltaeg at Open Circuit: About 3V
Caution: At 200Ωrange, short the test lead
first to obtain the resistance value of the test
leads. Deduct the resistance value from the
measured reading to obtain the correct value
of the object being measured .
B-6 Capacitance
20nF
200nF
2µF
20µF
1pF
10pF
0.1nF
1nf
Range Resolution Accuracy
(2.0% +10)
(2.5% +30)
Testing Signals: About 400Hz, 40mVrms.
Model UT57: OPERATING MANUAL
2-7 Frequency
Range Resolution Accuracy
20kHz 1Hz (1.0% +20)
200kHz 10Hz
Input sensitivity: 200mV rms,
Max Input Scope: 30V rms.
Overload protection: 230V rms
2-8 Diode and Continuity Beeper
Range Remark Measuring Condition
Display Diode
Forward Voltage
Value, unit is "V"
Forward DC Current abt
1mA, Backward DC
Voltage abt2.8V
Beeper sounds when
Resistance < 30Ω.
Display the nearest
value, unit is "kΩ"
Voltage at open Circuit
abt 3.0V
Overload protection: 230V DC orAC RMS.
Model UT57: OPERATING MANUAL
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C. Making Measurements
Caution
(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's internal circuit will
be damaged and this is dangerous to life.
(3) Become familiar with all buttons,and Turn the
rotary switch to proper range before operating.
(4) Put the / On/Off button at “ ” position as
do not measure AC current or voltage,otherwise,
The LCD will appear “ AC ” symbol.
1. LCD Display
2. + / On/Off Button
3. / On/Off Button
4. Rotary Switch
5. COM Input Jack
6. Capacitance Jack
7. Power On/Off Button
8. Data-Hold Button
9. 200mA~10A lnput Jack
10. Below 200mA Input Jack
11. V Hz lnput Jack
Ω
Model UT57: OPERATING MANUAL
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C-1 Measuring DC Voltage
1) / Button should not be pressed down
and LCD should not display “AC” Symbol.
2) Connect the black test lead to “COM” jack and
red test lead to “ V ” jack.
3) Set the rotary switch to “ V ”
4) Connect the test leads across with the object
to be measured. LCD appears the measuring
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 “1” is shown on the LCD, it means the Meter
is overloaded, then set the measuring range
to higher.
3) “ ” means never exceed the maximum input
limits, 1000V, otherwise internal circuit of the
Meter will be damaged even though it is still
possible to display higher voltage value.
4) Take extra care of voltage leakage when
measuring high voltage.
C-2 Measuring AC Voltage
1) Press down / button to display "AC" on
LCD. If + / button is not pressed, it
means the measuring value is the sum of
Direct and Alternate Current ( + ). While
if + / button is pressed, it means the
measuring value is a pure Alternate Current
TRMS.
Model UT57: OPERATING MANUAL
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