UNI-T UT57 Operating Manual

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.

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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

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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 T urn 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 T o 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

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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 V oltage display“ ”
l Strap for easy carry.
l Dimension: 190 x 88 x 34mm.
l Weight: about 270gram (excluding test

leads).

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B. Specifications
Accuracy is specified for one year after
calibration,at operating temeratures 23

o

C

5

o

C,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)

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B-3 Direct Current Current (DC Current)

B-4 Alternate Current Current (AC Current)

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