Prokit's Industries MT-1620 User Manual
CONTENTS
1. SAFETY INFORMATION………………………1
2. DESCRIPTION………………………………….7
3. SPECIFICATIONS…………………………….12
4. OPERATING INSTRUCTION………………..23
5. MAINTENANCE……………………………….42
6. ACCESSORIES…………………………….....45
1. SAFETY INFORMATION
To ensure safe operation, and in order to exploit to
the full functionality of the meter, please follow the
directions in this section carefully.
WARNING
This multimeter has been designed according to IEC-1010
concerning electronic measuring instruments with an
overvoltage category CATⅡ1000V, CATⅢ 600V and
pollution 2.
With proper use and care, the digital multimeter will give you
years of satisfactory service.
Follow all safety and operating instructions to ensure that the
meter is used safely and is kept in good operating condition.
1.1 PRELIMINARY
1.1.1 When using the meter, the user must observe all
normal safety rules concerning:
Protection against the danger of electrical attack
Protection of the meter against misuse
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1.1.2 When the meter is delivered, check if it has been
damaged in transit.
1.1.3 When harsh preservation or shipping
conditions caused, inspect and confirm this
meter without delay.
1.1.4 Test leads must be in good condition. Before
using verify that the insulation on test leads
is not damaged and/or the leads’ wire is not
exposed.
1.1.5 Full compliance with safety standards can be
guaranteed only if used with test leads
supplied. If necessary, they must be replaced
with the same model or the same class.
1.2 DURING USE
1.2.1 Before using, you must select the right input
jack, function and range.
1.2.2 Never exceed the protection limit values
indicated in specifications for each range of
measurement.
1.2.3 When the meter is linked to a measurement
circuit, do not touch unused terminals.
1.2.4 Do not measure voltage if the voltage on the
terminals exceeds 600V above earth ground.
1.2.5 At the manual range, when the value scale to
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be measured is unknown beforehand, set the
range selector at the highest position.
1.2.6 Always be careful when working with
voltages above 60V DC or 30V AC rms, keep
fingers behind the probe barriers while
measuring.
1.2.7 Never connect the meter with any voltage
source while the function switch is in the
current, resistance, capacitance, diode,
continuity ， temperature, humidity, sound level or
illuminance range, otherwise it will damage
the meter.
1.2.8 Before stir the transform switch to change
functions, disconnect test leads from the
circuit under test.
1.2.9 When carrying out measurements on TV or
switching power circuits always remember
that there may be high amplitude voltages
pulses at test points, which can damage the meter.
1.2.10 Never measure any of resistance，
capacitance, diode or continuity
measurements on live circuits.
1.2.11 Never perform capacitance measurements
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unless the capacitor to be measured has been
discharged fully.
1.2.12 Never use the meter under the condition of
the explosive air, steam or dirt.
1.2.13 If any faults or abnormalities are observed,
the meter can not be used any more and it
has to be checked out.
1.2.14 Never use the meter unless the rear case is
in place and fastened fully.
1.2.15 Please do not store or use meter in areas
exposed to direct sunlight, high temperature,
humidity or condensation.
1.3 SYMBOLS
Important safety information, refer to the
operating manual.
Dangerous voltage may be presence.
Double insulation（Protection class ）.
CAT III Overvoltage (Installation) category III,
Pollution Degree 2 per IEC1010-1 refers
to the level of Impulse Withstand Voltage
protection provided.
Conforms to European Union Directive
Earth ground
Fuse
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Low Battery
~ AC (alternating current)
DC (direct current)
Continuity Buzzer
~ AC or DC (alternating current or direct current)
1.4 MAINTENANCE
1.4.1 Please do not attempt to adjust or repair the
meter by removing the rear case while
voltage is being applied. A technician who
fully understands danger involved should
only carry out such actions.
1.4.2 Before opening the case of the meter, always
disconnect test leads from all sources of
electric current.
1.4.3 To avoid the wrong reading causing
electricity attack, when the meter
displays“ ”, you must change the battery.
1.4.4 For continue protection against fire, replace
fuse only with the specified voltage and
current ratings: F 500mA/250V (quick acting).
1.4.5 Do not use abrasives or solvents on the
meter, use a damp cloth and mild detergent
only.
1.4.6 ALWAYS set the power switch to the OFF
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position when the meter is not in use.
1.4.7 If the meter is to be stored for a long period of time, the
batteries should be removed to prevent damage to the
unit.
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2. DESCRIPTION
- The 5 in 1 digital multi-tester has been designed
to combine the functions of Sound Level Meter,
Light Meter, Humidity Meter, Temperature Meter
and Digital Multimeter.
- The Sound Level function can be used to
measure noise in factories, schools, offices,
airports, home, etc., checking acoustics of
studios, auditoriums and hi-fi installations.
- The Light function is used to measure
illuminance in the field. It is fully cosine
corrected for the angular incidence of light. The
light sensitive component used in the meter is a
very Stable, long life silicon diode.
-The Humidity/Temperature is for use a humidity
semiconductor sensor and K type
thermocouple.
-The digital Multimeter performs AC/DC Voltage,
AC/DC Current, Resistance，Frequency, Duty,
Capacitance measurement and Continuity, Diode test.
- This meter is a portable professional measuring
instrument with large LCD and back light easily
reading. Single operation of a range switch
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makes measurement convenient. Overload
protection and low battery indication are
provided. It is an ideal multi-function Instrument
with scores of practical applications for
professional, workshop, school, hobby and
home use.
-When using, it can show ranges engineering
unit enunciators measuring results.
- This meter has function of auto range and
manual range.
- This meter has function of auto power off.
- This meter has function of data hold.
- This meter has function of relative measuring.
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2.1 NAMES OF COMPONENTS
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Light, Sound and Humidity Sensitive Component
LCD Display
Function Transform Button
Function Rotary Switch
10A Input Jack
mA/℃ Input Jack
COM Input Jack
V、Ω、Hz、 、 Input Jack
2.2 SWITCH, BUTTONS AND INPUT JACK
ELUCIDATION
HOLD Button: This Button is used to the switch
of data hold.
FUNC Button: This button is used to transform
function.
RANGE Button: This button is used to
transform Auto range or manual range.
Hz% Button: This button is used to
the transformation of Hz or Duty measuring.
REL Button: This button is used to
the transformation of relative measuring.
LIGHT Button: This button is used to the switch
of back light.
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Transform Switch: This switch is used to select
functions and desired ranges.
OFF – switch: This switch is used to turn off the
power.
10A Input Jack: Input terminal for current 0 ~
10A.
mA/℃Input Jack: Input terminal for current 0 ~
400mA, centigrade temperature.
V、Ω、Hz、 、 Input Jack
Input terminal for voltage, resistance, frequency,
duty, capacitance, diode, continuity.
COM Input Jack
Common terminal for current, voltage,
resistance, frequency, duty, capacitance, diode
and continuity measurement.
Humidity Semiconductor Sensor: This sensor is
used to measure humidity.
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3. SPECIFICATIONS
Accuracy is specified for a period of year after
calibration and at 18℃ to 28℃（64(F to 82(F） with
relative humidity to 75%.
3.1 GENERAL SPECIFICATIONS
3.1.1 It includes 14 function with 39 ranges.
3.1.2 Auto ranges and manual range.
3.1.3 Overrange protection for all ranges.
3.1.4 Max. Voltage Between Terminals And Earth
Ground: 600V DC or rms AC
3.1.5 Operating Altitude: 2000 meters (7000 ft.)
maximum
3.1.6 Display: “ ”LCD
3.1.7 Max. Show Value: 3999 counts max
3.1.8 Polarity Indication: ‘-’indicates negative
polarity.
3.1.9 Overrange Indication: Display ‘0L’ or ‘-0L’
3.1.10 Sampling Time: approx. 0.4 second
3.1.11 Unit showing: showing of function and
electrical capacity.
3.1.12 Auto power off time: 15 min.
3.1.13 Fuse Protection: F 500mA/250V (quick
acting).
3.1.14 Power Supply: 9V battery, NEDA 1604 or
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6F22
3.1.15 Low Battery Indication: ‘”’ displayed
3.1.16 Temperature Factor: < 0.1×Accuracy /℃
3.1.17 Operating Temperature: 0℃ to 40℃（32℉
to 104℉）
3.1.18 Storage Temperature: -10℃ to 50℃（10℉
to 122℉）
3.1.19 Dimension: 178×85×40mm
3.1.20 Weight: approximate 320g（including
battery）
3.2 ELECTRICAL SPECIFICATIONS
Circumstance Temperature: 23℃; Relative
Humidity: < 70%
3.2.1 DC Voltage
Range Resolution Accuracy
400mV 0.1mV
4V 1mV
40V 10mV
400V 100mV
600V 1V ±（1.0% of rdg + 2digits）
- Input Impedance: 10M
- Overload Protection: 400mV range: 250V DC or
rms AC,
±（0.7% of rdg + 2digits）
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