Major tech MT570 User manual

INSTRUCTION MANUAL
5kV HIGH VOLTAGE
INSULATION TESTER
MT570

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Contents Page no
1. Safety Precautions............................................................................4
2. Overview...........................................................................................5
3. Features...........................................................................................5
4. Specifications...................................................................................6
5. Connections.....................................................................................7
6. Instrument layout..............................................................................8
7. Measuring procedure........................................................................9
8. Charge............................................................................................15
9. Maintenance & repair......................................................................15

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1. Safety Precautions
Electricity can cause severe injuries even with low voltages or currents.
Therefore, it is extremely important that you read the following
information before using your high voltage insulation tester.
1.1. This Instrument must only be used and operated by a competent
trained person and in strict accordance with the instructions. we
will not accept liability for any damage or injury caused by misuse
or non-compliance with instructions and safety procedures.
1.2. This instrument must not be used on live circuits. Ensure all circuits
are de-energized before testing. see paragraph for details of built-
in warning features should your high voltage insulation tester be
connected to a live system.
1.3. Always inspect your high voltage insulation tester and test leads
before use for any sign of abnormality or damage. If any abnormal
conditions exist (broken test leads, cracked case, display faulty
etc...) do not attempt to take any measurement or use the tester.
Return your high voltage insulation tester to your nearest
distributor for service.
1.4. Your high voltage insulation tester has been designed with your
safety in mind. However, no design can completely protect against
incorrect use. Electrical circuits can be dangerous and / or lethal
when a lack of caution or poor safety practice is used.
1.5. Pay attention to cautions and warnings which will inform you of
potentially dangerous procedures.
1.6. Your high voltage insulation tester has a live circuit warning beeper.
If it is connected to a live circuit, a rapid pulsating bleep will be
heard. DO NOT proceed to test and immediately disconnect the
instrument from the circuit. In addition your tester will display the
warning message.
1.7. Rated environmental conditions :
1. Indoor use.
2. Installation Category IV.
3. Pollution Degree 2.
4. Altitude up to 2000 meters.
5. Relative humidity 80% max.
6. Ambient temperature 0ºC~40ºC.
1.8. Observe the international Electrical Symbols listed below :
Meter is protected throughout by double insulation or
reinforced insulation.
Warning ! Risk of electric shock.
Caution ! Refer to this manual before using the meter.
Earth

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2. Overview
This is a 5kV high voltage insulation tester which has output voltages of
500V, 1000V, 2500V, 5000V.
The top line of the display shows the elapsed time at the start of the test.
Digital readout of the total time will remain displayed even after testing
has ceased.
This instrument displays a voltage warning and sounds when AC or DC is
present before injecting the test voltage.
3. Features
Ÿ2 Lines × 16 Characters LCD
ŸMicroprocessor-controlled
ŸTests insulation resistance up to 1TΩ
Ÿ4 Insulation test voltages: 500V, 1000V, 2500V, 5000V
ŸAC/DC Voltmeter (30-600V)
ŸShort-circuit current up to 5mA
ŸPI (Polarization Index) indication
ŸDAR (Dielectric Absorption Ratio) indication
ŸAuto-ranging on all insulation ranges
ŸAuto-hold function to freeze reading
ŸOverload protection
ŸAdjustable testing duration: 1-30 minutes
ŸInternal memory for data storage
ŸDisplays testing duration for insulation measurement
ŸAuto-off function
Ÿ200 measurement results can be saved in memory and recalled on
display

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Function Range
Test Voltage 500V, 1000V, 2500V, 5000V
Insulation resistance 100GΩ / 500V 500GΩ / 2500V
200GΩ / 1000V 1TΩ / 5000V
Accuracy ±(5.0%rdg + 5dgt)
Resolution 1000MΩ: 1MΩ 100GΩ: 0.1GΩ
10GΩ: 0.01GΩ 1TΩ: 1GΩ
Short circuit current up to 5mA
PI (Polarization Index) √
DAR (Dielectric √
Absorption Ratio)
Voltmeter ACV: 30~600V (50/60Hz)
DCV: 30~600V
Accuracy: ±(2.0%rdg + 3dgt)
Resolution: 1V
Current measurement 0.5nA ~ 0.55mA (Depending on the insulation
resistance)
Power source 1.5V "C" × 8 Alkaline batteries
DC3V (CR2032) × 1
Dimensions 250(L) × 190(W) × 127(D) mm
Weight Approx. 2070g (battery included)
Safety standard IEC/EN 61010-1 CAT IV 600V
IEC/EN 61010-2-030
EN 61326-1
Accessories Instruction manual Carry case
Test leads Batteries
Alligator clips Shoulder belt
4. Specifications

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5. Connections
FIRST MEASUREMENT
Measure without the guard to take everything into account and find
out if need cleaning.
DIRTY
INSULATOR
ELECTRICAL
EQUIVALENT
CIRCUIT DIRTY
INSULATOR SECOND
MEASUREMENT
Measure with the
guard to ensure
insulator is correct.
TYPICAL TEST
Resistance due to contamination can be
very low and lower the total resistance.
Cleaning periodically can also reduce
system power consumption.

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6. Instrument Layout
1 - LCD display
2 - +HV terminal
3 - GUARD terminal
4 - -HV terminal
5 - ENTER / SAVE button
6 - Function rotary switch
7 - ESC/ button
8 - "▼" button
9 - SEL button
10 - TEST / STOP button
11 - "▲" button

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7. Measuring procedure
This insulation tester provides five main functions and four minor
functions:
Main Functions:
1. 500V voltage insulation resistance test.
2. 1000V voltage insulation resistance test.
3. 2500V voltage insulation resistance test.
4. 5000V voltage insulation resistance test.
5. AC/DC voltage measurement.
Minor functions:
Function 1 ─ Date/time adjustment
Function 2 ─ Measurement time setting.
Function 3 ─ Display data stored
Function 4 ─ Delete data stored
7.1. Insulation resistance measurement test (main function)
Note:
1. Before test performed, be sure that no voltage is present. If
voltage is present, disconnect the power supplied.
2. To secure operator's safety, check if there is any damage on the
insulation tester or test cable.
3. During the test, do not touch any exposed metal parts or test
lead tip.
4. Wear insulation gloves and rubber shoes while operating this
high-voltage measuring instrument.
7.1.1. Checks before test is performed:
Turn the function rotary switch to any functions to check if the
Battery power is enough or not.
If the Battery power is approximate DC 10V, "Batt. Low" will be
displayed on the LCD display.
If the Battery power is approximate DC 8.5V, "Batt. Fail" will be
displayed on the LCD display. Then, please replace with new
Alkaline batteries.

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7.1.2. Insulation measuring procedure:
1. Connect to test cable to test object.
2. Turn the function rotary switch to the test voltage from
500V, 1000V, 2500V or 5000V respectively.
3. When pressing and holding the backlight button then the
display will shows the backlight function.
4. Be sure that the cable connecting the test object does not
have a voltage (above AC30V or DC30V). The LCD will
display the voltage picture as show in the AC/ DC voltage.
If pressing the TEST/ STOP button, the LCD displays the
warning picture show in below
Note: The test cannot be performed. To test remove the
exterior voltage.
5. Press the TEST / STOP button for testing continuously.
While test is running, beeper activates to remind -9-
operator that test is underway. After the set test time is
completed (see Function 2: the test time setting), the test
stops and system will automatically hold the test value. To
read the test value on the LCD display.
6. Press the TEST / STOP button for discharging.
7. Read the test value from LCD display.

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8. To store the data, press the ENTER/ SAVE button; LCD displays
the picture show in below;
Note: When doing an insulation test, always connect the test leads
to the object we want to measure before pressing the TEST button.
Do not press the TEST button in advance.
7.1.3. ACV/DCV Measuring procedure:
1. Turn the function rotary switch to V AC/DC(30~600V)
function. LCD displays the picture shown in below.
2. Input AC/DC Voltage; LCD displays the picture shown in
below.
7.1.4. Minor Functions:
7.1.4.1.Function 1- Date/ time adjustment
(RTC Adjustment)
1. Turn on the insulation tester by rotating the function rotary
switch to any position(except OFF).
2. Press the SEL function to enter the minor function
selection, LCD displays the following picture respectively;
3. Press the ENTER/SAVE button to enter the Date/Time
Adjustment.

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4. Press the SEL button to select year, month, day, hour,
minute for adjustment, LCD displays the following picture
respectively;
5. Press the ▲ "up button" or the ▼ "down button" till the
correct value is reached.
6. After all adjustments are complete, press the ENTER/SAVE
button to confirm and save the data measured.
Note: if Date/Time unit (year, month, day, hour or minute)
needs not to be adjusted, press the ESC/ to skip it and
return back to the minor function selection.
7. Press the ESC/ button again to return back to the main
page.
7.1.4.2. Function 2 – Measurement time setting
(Test Timer)
1. Turn on the insulation tester by rotating the function rotary
switch to any position(except OFF).
2. Press the SEL function to enter the minor function selection.
3. Press the ▲ "up button" or the ▼ "down button to find the
measurement time setting; LCD displays the following
picture respectively;
4. Press the ENTER/SAVE button, LCD displays the picture
shown in below:
5. Press the ▲ "up button" or the ▼ "down button" to set the
test time (from 1-30 minutes)
6. After setting is complete, press the ENTER/ SAVE button to
confirm & save the data measured.
Note: if Test Timer unit needs not to be adjusted, press the
ESC/backlight button and return back to the minor function
selection.

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7. Press the ESC/backlight button again to return back to the
main page
7.1.4.3.Function 3 – Display the data stored
(Log Display)
1. Turn on the insulation tester by rotating the function rotary
switch to any position(except OFF).
2. Press the SEL function to enter the minor function selection
3. Press the ▲ "up button" or the ▼ "down button to find the
measurement time setting; LCD displays the following
picture respectively;
4. Press the ENTER/SAVE button, LCD displays the picture
shown in below:
5. Press the ENTER/SAVE button to query the subpage of data
(include Resistance value, testing voltage, PI, DAR, Saving
Date & Time).
6. Press the ▲ "up button" or the ▼ "down button to select
the required data value. If no data available, LCD displays
the picture shown in below
7. After the query is over, press the ESC/ button to return
back the minor function selection.
8. Press the ESC/ button again to return back to the main
page.
7.1.4.4. Function 4 – Clear/Erase the data stored
(LOG Clear)
1. Turn on the insulation tester by rotating the function rotary
switch to any position(except OFF).
2. Press the SEL function to enter the minor function selection.

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3. Press the ▲ "up button" or the ▼ "down button to find the
measurement time setting; LCD displays the following
picture respectively;
4. Press the ENTER/SAVE button to inquire whether to clear
up the data or not; LCD displays the picture shown in
below:
Note: if the erasing unit needs not to be done, press ESC/
button to skip it and return back to the minor function
selection.
5. Press the ENTER/SAVE button again to clear up the data;
LCD displays the picture shown in below:
then return back to the minor function selection.
6. Press the ESC/ button again to return back to the main
page.
7.1.5. Introduction of other Functions:
1. Dielectric absorption ratio (DAR):
Ratio of insulation resistance between 1-min and 30-sec
2. Polarization index (PI):
Ratio of insulation resistance between 10-min and 1-min
DAR : 1-min insulation resistance
30-sec insulation resistance
PI : 10-min insulation resistance
1-min insulation resistance
Lower insulation resistance tested takes a longer test time,
which would deteriorate the object under test. Thus, higher
DAR or PI (as close to 1) would create better insulation
grade of the object under test.

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Operation:
During the test run, wait for one minute, DAR will be
displayed automatically; wait for 10 minutes, PI will be
displayed automatically.
3. AUTO OFF:
System will shut down automatically after 3 minutes
without operation.
8. Battery replacement
When the LCD displays "Batt. Low", disconnect the test leads from the
high voltage insulation tester and turn off the power. Replace with
new Alkaline batteries. (1.5V "C" type x 8)
9. Maintenance & repair
9.1. To avoid and electric-shock or device damage, do not wet inner
part of the tester.
9.2. Avoid the tester from being dropped that would damage or
disconnect devices.
9.3. Wipe the tester surface with soft, dry cloth and mild detergent.
Prohibit from using sandpaper or solvent.
Note:
1. This tester is HV operated; user should not open the outer casing. If
any damage occurs, take the tester back to manufacturer for repair.
2. If the tester is not used for over 60 days, remove the batteries for
storage.

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