Pro's Kit MT-1707 User manual

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MT-1707
3-5/6 True-RMS Digital Multimeter

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User’s Manual
1st Edition, 2018
©2018 Copyright by Prokit’s Industries Co., Ltd.
1. General Information
This digital multimeter is designed and manufactured in compliance with
IEC-61010 safety requirements on electronic measuring instruments and
hand-held digital multi-meters. It is compliant with IEC-61010requirements
pertaining to CAT IV 600V, CAT. III 1000V and requirements on pollution
degree 2. Please read carefully this operation manual and pay attention to
safety guidelines before operating this meter.
1.1 Safety information
1.1.1 Safety instructions
* Before operating this meter, the operator must observe all standard safety
procedures in the two respects below:
A. Safety procedures against electric shock
B. Safety procedures against unintended use
* To ensure your personal safety, please use the test lead that accompanies
the meter. Before operating this meter, ensure that the test lead is flawless.
1.1.2 Safety considerations
* When the meter is used in the vicinity of the equipment that produces
strong electromagnetic interferences, the reading on the meter will grow
unstable and even produce serious errors.
* Don't operate the meter or pen-shaped meter whose appearance is
damaged.
* The safety function of the meter will become null if the meter is not
properly operated.
* The meter must be operated with great care when working in the vicinity of
an exposed conductor or busline.

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* The meter is prohibited from being used in the vicinity of any explosive
gas, vapor or dust.
* The measurement must be made with correct input terminals and
functions and within the allowable measuring range.
* To prevent the meter from being damaged, the value to be input shall not
exceed the extremes allowed by each measuring range.
* When the meter has already been connected to the line being measured,
the operator is prohibited from touching the input terminal that is not in
service.
* When the voltage measured exceeds 60Vdc or 30Vac (valid value), the
operator shall be careful enough to avoid electric shock.
* When making measurement with a test lead, place your fingers behind its
protective ring.
* When switching to another measuring range, be sure that test lead has
already been taken off the measured circuit.
* For all DC functions, to prevent potential electric shock as a result of
incorrect reading, please first use AC functions to check the absence of
any AV voltage. Then, select DC voltage measuring range equivalent to or
greater than that for AC voltage.
* Before the tests on electric resistance, diode, capacitor or continuity, the
operator must cut off the power supply to the circuit to be measured, and
discharge all high-voltage capacitors within the circuit to be measured.
* The electric resistance measurement or continuity test cannot be carried
out in any live electrical circuit.
* Before the current measurement, the operator must first examine the
protective tube of the meter. Before connecting the meter to the circuit to
be measured, the operator must first power off the aforesaid circuit.
* Before repairing TV sets or measuring power switching circuit, the
operator must be careful enough to prevent high amplitude voltage
impulse from damaging the meter.
* This meter uses 1 x 9V 6F22 batteries that must be correctly installed into
the battery compartment.

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* When appears, the batteries must be replaced immediately. The low
level of a battery will result in incorrect reading on the meter, which is likely
to bring electric shock or personal injury to the operator.
* In measurement, category III voltage and category IV voltage shall not
exceed 1000V and 600V respectively.
* The meter shall not be in service if its case (or part of its case) is
dismantled.
1.1.3 Safety symbol:
The safety symbols that appear on the meter's body and in this Operation
Manual:
Warning, an important safety symbol. The operator
must consult this Operation Manual before using the
meter. Unintended use may lead to the damage to the
device or its components.
AC (alternating current)
DC (direct current)
AC/DC
Ground
Double insulation protection
Fuse
High voltage warning
CAT. III 1000
V
Over-voltage protection
CAT. IV 600 V
Over-voltage protection
1.1.4 Maintenance practices for safety
* The operator must first pull out the test lead when the meter's case is
opened or the battery cover is dismantled.

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* The designated replacement parts must be used at the moment of
maintenance.
* The operator must cut off all relevant power supplies before opening the
meter. At the same time, the operator must avoid damage to the meter's
elements by ensure that he himself doesn't carry any static.
* The meter can only be calibrated, repaired and maintained by
professionals.
* When the meter's case is opened, the operator must understand the fact
that the presence of some capacitance may promise the dangerous
voltages even if the power supply to the meter is cut off.
* The operator should stop using and maintain the meter immediately if any
abnormality has been observed on the meter. The operator must see to it
that the meter cannot be in service unless it is proved conforming.
* When the meter is left idle for a long period, the operator shall remove the
battery and place it in a place free from high temperature and humidity.
1.2 Input protection measures
* The meter can sustain the maximum input voltage of 1000V (DC) or 750V
(AC) at the moment of voltage measurement.
* The meter can sustain the maximum AC voltage of 600V or equivalent
voltage (valid value) when the tests on frequency, electric resistance,
continuity and diode are carried out.
* The protective tube (F500mA/250V) is used for protection purpose when
A and mA current measurements are carried out. The protective tube
(F10A/250V) is used for protection purpose when A current measurements
are carried out.
2. A Schematic Diagram for the Meter
This meter is a hand-held digital multi-meter with the function of displaying
True RMS. it is a large-screen LCD unit with backlight and illumination light
functions so that the user can easily recognize reading. It is equipped with
the function of overload protection and the indicator of battery under voltage.

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Either for professionals, factories, schools, enthusiasts or households, it is
an ideal multi-functional meter.
2.1 A Schematic Diagram for the Meter
Physical appearance
①Non-contact voltage detection area
②LED Light
③Non-contact voltage indicator
④LCD screen
⑤Select key
⑥Hold key
⑦Backlight key
⑧LED light key
⑨Rotary switch
⑩Input socket

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①
②
③
④
⑥
⑦
⑧
⑨
⑤
⑩

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2.2 Description of the symbols on the display unit

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Table.1 Symbols (Continued)
V, mV
V:
mV：
V: the unit of volt
Millivolt，1x10-3 or 0.001 volt.
A, mA, A
A: mA:
A:
Ampere, the unit of current.
Milliampere, 1x10-3 or 0.001
ampere. Microampere, 1x10-6 or
0.000001 ampere.
, k , M
: k :
M:
Ohm, the unit of electric resistance.
Kilohm, 1000 Ohm
Megaohm, 1,000,000 ohm.
MkHz
Hz:
KHz:
MHz:
Hz, the unit of frequency KHz,
1x103Hz.
MHz, 1x106Hz or 1000 KHz.
mF, F, nF
F: mF:
F:
nF:
Farad, the unit of capacitance.
Millifarad, 1x10-3 or 0.001 farad.
Microfarad, 1x10-6 or 0.000001 farad.
nF, 1x10-9 or 0.000000001 farad.
2.3 Description of functional keys
Key
Description of functions
Select
SEL keys, e.g.
Temperature measurement position: ℃mode or ℉
mode.
AC voltage position: press the key to select
voltage/frequency mode in the AC voltage
measurement mode.
Hold
Press the key to hold the measured value for the
current moment Press the key again to cancel this
function.

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Press the key, the backlight and the illumination
indicator will be on; and press the key anther ,
you will turn off backlight and illumination
indicator. If you don't press the key at all, the
function will automatically be disenabled in 15
minutes.
LED light key. Press the key, the led light will be
on, and press the key another, the led light will
be off.
2.4 Description of input socket
input socket
Description
COM
All public input terminals to be measured are
connected to test leads in black or the public output
plugs of exclusive multi-function test sockets.
V Hz
Positive input terminals (connected to a test lead in
red) for capacitor measurement, diode
measurement, beep on/off test, temperature
measurement, voltage measurement, electric
resistance, frequency, duty ratio measurement.
A mA
A / mA positive input terminal (connected to a test
lead in red).
℃
/
℉

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10A
10A positive input terminal (connected to a test lead
in red).
2.5 Accessories
1.Operation Manual X 1 copy 2. Test lead X 1 pair
3.K-Type thermocouple X 1 pce
3. Operational guidelines
3.1 Normal operation
3.1.1 Hold mode
In the hold mode, the reading can be maintained on the display unit.
Changing the measurement function position or pressing the key "Hold"
again to exit the hold mode.
Hold mode: entry and exit
1. Press the key “Hold ” and the reading will be held and the symbol
“HOLD” will appear on the LCD screen.
2. Press the key “Hold” again to restore the meter to its status for normal
measurement.
3.1.2 Backlight
The meter is equipped with the functions of backlight so that the operator
can access measurement results even if he is in a darker place. The
backlight function can be enabled or disenabled by the steps below:
1. Press the key" "to enable backlight .
2. Press the key" " again to manually disenable backlight; wait
for 15 seconds until the backlight is automatically disenabled.
3.1.3 LED Light
Press the key " ",the led light will be on, and press the key another, the
led light will be off.
3.1.4 Auto power off
If no operations are made in 15 seconds following the initialization, themeter
will sound to remind the operator to automatically cut off power supply and

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enter the state of dormancy. The meter can be rebooted when the operator
presses "Hold" or " "key in the auto power off mode.
3.2 Measurement guidelines
3.2.1 Measurement of AC voltage and DC voltage
To avoid any electric shock and/or damage to the meter, do
not attempt a voltage measurement if the voltage (valid
value) is 1,000V for DC current or 750V for AC current. To
avoid any electric shock and/or damage to the meter, don't
attempt to impose between any public terminal and ground
any voltage whose valid value is over 1,000V for DC current
or 750V for AC current.
The meter provides DC voltage measuring ranges as follows: 600.0mV,
6.000V, 60.00V, 600.0V and 1000V, and AC voltage measuring ranges:
6.000V, 60.00V, 600.0V and 750V.
Measurement of AC voltage or DC voltage
⚫Turn the rotary switch to the position ～V or V.
⚫Connect the test lead in black and test lead in red to COM input socket
and V input socket respectively.
⚫Use another two ends of the test lead to measure the voltage of the
circuit to be measured. (In parallel connection with the circuit to be
measured)
⚫Read the measured voltage value on LCD screen. When DC voltage
measurement is attempted, the display unit will show the voltage polarity
of the circuit connected to the pen-shaped meter in red.
Notes:
◼Within the measuring range of DC voltage of 600mV and AC voltage of
6V, even if there is no input or no connection to the test lead, the meter

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will display some information. In this situation, press short circuit “V－”
and “COM” terminal to reset the meter to zero.
◼Within the AC voltage function, press the key "Select" to measure the
frequency of the AC voltage source.
◼The value of the AC voltage measured with this meter is True RMS (root
mean square). These measurements are accurate for sine wave and
other waves (without DC offset), square wave, triangular wave and step
wave.
3.2.2 Frequency measurement
To avoid any electric shock and/or damage to the meter, do
not attempt a frequency measurement if the voltage is over
750V for DC current or AC current(valid value).
Frequency measurement at the Hz%position:
◼Turn the rotary switch to the position Hz%.
◼Connect the test leads in black and in red to COM input socket and Hz
input socket respectively.
◼Use another two ends of the test lead to measure the frequency of the
circuit to be measured.
◼Read the measured frequency on LCD screen.
Frequency measurement at the ACV position:(It is only applicable to
measuring frequencies less than 1KHz.)
◼Turn the rotary switch to the position～6V/60V/600V/750V.
◼Press the "Select" key to select "Hz".
◼Connect the test lead in black and test lead in red to COM input socket
and V input socket respectively.
◼Use another two ends of the test lead to measure the frequency of the
circuit to be measured.
◼Read the measured frequency value on LCD screen.

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3.2.3 Electric resistance measurement
To avoid the meter or the measured equipment from damage,
do not attempt a resistance measurement unless the operator
has already cut off all power sources for the circuit to be
measured and fully discharged all high-voltage capacitors.
Ohm is the unit of electric resistance ( ).
The measuring ranges of electric resistance of this meter are 600.0 ,
6.000k , 60.00k , 600.0k , 60.00M and 600.0M ,
Measurement of electric resistance
1. Turn the rotary switch to the appropriate position.
2. Connect the test lead in black and test lead in red to COM input socket
and V/ input socket respectively.
3. Use another two ends of the test lead to measure the electric
resistance of the circuit to be measured.
4. Read the measured electric resistance value on LCD screen. Notes:
◼The measured value of the electric resistance of the circuit differs a bit
from the rated value of the electric resistance.
◼To ensure measurement accuracy, in attempting a low resistance
measurement, first put two pen-shaped meters in short circuit and
capture the resistance reading of these short circuits. Then subtract
the aforesaid reading from the measured resistance.
◼At 60M /600M position, you have to wait a few seconds before the
reading grow stable. This is quite normal for a high resistance
measurement.
◼When the meter is in open circuit, the display unit will show "OL" that
indicates the measured value is over the measuring range.

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3.2.4 Diode test
To avoid the meter or the measured equipment from damage,
do not attempt a diode test unless the operator has already
cut off all power sources for the circuit to be measured and
fully discharged all high-voltage capacitors.
Diode test outside the circuit:
1. Turn the rotary switch to the position .
2. Connect the test leads in black and in red to COM input socket and
V/ input socket respectively.
3. Connect the test leads in black and in red to the positive and negative
poles of the diode to be tested respectively.
4. The meter displays the forward bias value of the diode to be tested. If
the polarity of the test lead is reversed, the meter will display "OL". A
normal diode still produces a forward voltage drop of 0.5V to 0.8V; the
reverse bias voltage reading depend on the variation in electric
resistance of other channels between two pen-shaped meters.
3.2.5 Beep continuity test
To avoid the meter or the measured equipment from damage,
do not attempt a beep continuity test unless the operator has
already cut off all power sources for the circuit to be measured
and fully discharged all high-voltage capacitors.
Steps for a continuity test:
1. Turn the rotary switch to the position .
2. Press the "Select" key to select measure.
3. Connect the test lead in black and test lead in red to COM input socket
and V/ input socket respectively.
4. Use another two ends of the test lead to measure the resistance of the
circuit to be measured. If the measured distance is no more than 30Ω,
the sensor LED will be on and the beeper will sound continuously.

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3.2.6 Capacitance measurement
To avoid the meter or the measured equipment from damage,
do not attempt a capacitance measurement unless the
operator has already cut off all power sources for the circuit
to be measured and fully discharged all high-voltage
capacitors. Use the DC voltage position to determine that all
capacitors have been discharged.
The measuring range for the capacitance of this meter are 1.000nF~60mF.
Measurement of capacitance:
1. Turn the rotary switch to the position 60mF.
2. Connect the test leads in black and in red to COM input socket and
input socket respectively.
3. Use another two ends of the test lead to measure the capacitance of
the capacitor to be measured, and capture the measured value on
LCD screen.
Note:
◼The measurement of a large capacitance requires a given period of
stabilization of reading.
◼To avoid damage to the meter, the measurement of a capacitor with
polarities requires much attention to its polarity.
3.2.7 Current measurement
Do not attempt a measurement on the current in a circuit, if
when the voltage between the open-circuit voltage and the
ground is over 250V. If the fuse is blown at the moment of
measurement, you are likely to damage the meter or get
yourself hurt.
To avoid any damage to the meter or equipment to be
measured, do not attempt a current measurement unless you

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have examined the meter's protective tube. In attempting a
measurement, you should use the correct input sockets,
function positions and measuring ranges. When a test lead is
inserted into the current input socket, do not put the other end
of the test lead in parallel connection with any circuit.
The meter provides DC current measuring ranges as follows: 600.0uA,
60.00mA, 600.0mA and 10.00A; and AC current measuring ranges:
60.00mA, 600.0mA, and 10.00A.
Measurement of current:
1. Turn the rotary switch to the appropriate position.
2. Connect the test lead in black to COM input socket. Connect the test
lead in red to a mA input socket when the measured current is less
than 600mA; connect the test lead in red to a 10A input socket when
the measured current is 600mA~10A.
3. Disconnection of the circuit to be measured Connect the test lead in
black to the end of disconnected circuit (the voltage is lower) and
connect the test lead in red to the end of the disconnected circuit
(voltage is higher).
4. Connect the power to the circuit and capture the displayed reading. If
the display unit only shows "OL", it means the input is over the
selected measuring range. At this moment, turn the rotary switch to a
higher measuring range.
5. When the measured current is greater than 5A, the measurement time
is not more than 10 seconds.
3.2.8 NCV test (non-contact voltage detection)
Turn the rotary switch to NCV position, and place the top of the meter
approach the conductor. If the meter detects the AC voltage, the indicators
for signal density (high, medium and low) will be on in accordance with the
detected density, while the beeper will sounds alarms at different
frequencies.
Note:

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1: Voltage may still remain in the absence of any indication. The operator
shall not rely on non-contact voltage detector to check the presence of
voltage. The detection operation may be affected by various factors,
including socket design, insulation thickness and type.
2. When the voltage is input into the meter's input terminal, the
voltage sensor LED may be on as a result of induced voltage.
3. External sources of interference (like flashlight and motor) may
trigger non-contact voltage detection.
3.2.9 Measuring temperature
Put the range switch at the gear of / . Insert the red plug of
the thermocouple into the end of , and insert the black plug of the
thermocouple into COM socket. Directly read the temperature value from the
display screen after the reading is stable.
Notes: Themaximum measuring temperature for the K-type thermocouple
dispatched at random is 250 , and its instant measuring value can reach
300
4. Technical parameters
4.1 Overall parameters
⚫Operating environment:
600V CAT Ⅳand 1000V CAT. ⅢPollution level: 2
Altitude < 2000 m
Working temperature & humidity: 0~40℃(The requirements will not be
considered when temperature is less than 10℃and relative
humidity is below 80%).
Storage temperature & humidity: -10~60℃(batteries shall be removed
when RH is below 70%).
⚫Coefficient of temperature: 0.1 accuracy/ ℃(<18 ℃or >28℃).
⚫Allowable max voltage between terminal to be measured and ground:
1000V DC or 750V AC (valid value)
.

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⚫Protection of protective tube: mA position: protective tube F 500mA/250V;
A position protective tube F 10A/250V
⚫Rotation rate: approximately 3 revolutions/second
⚫Display unit: 6000 counts displayed on LCD screen. Automatically display
the symbol for unit in accordance with measurement function position. ⚫
Outrange indication: the LCD screen will display "OL".
⚫Battery Low indication: “ ” will appear when the battery's voltage is
below the normal working voltage.
⚫Input polarity indication: “ ” will automatically appear.
⚫Power: 1 x 9V 6F22 battery
⚫Dimensions: 190 mm(L)×89mm(W)×53mm(H).
⚫Weight: approximately 315g (not included batteries or test leads)
4.2 Precision indicator
Accuracy: ( reading + digit)
The accuracy warranty will run for 1 year upon the ex-factory date.
Reference conditions: Ambient temperature is between 18℃and 28℃and
relative humidity is no more than 80 .
4.2.1 DC voltage
Measuring range
Resolution
Accuracy
600mV
0.1mV
±(0.5% Reading + 3 digits)
6V
1mV
60V
10mV
600V
100mV
1000V
1V
Input impedance:10M
Maximal input voltage: 1000Vdc or 750Vac valid value
4.2.2 AC voltage
Measuring range
Resolution
Accuracy