Major tech MT560 Manuale utente
INSTRUCTION MANUAL
DIGITAL
INSULATION TESTER
MT560
2
3
Contents Page no
1. Safety Information.............................................................................4
2. Safety Symbols..................................................................................4
3. Specifications....................................................................................4
3.1. General Information.................................................................4
3.2. Electrical Specifications............................................................5
4. Parts & Control..................................................................................7
4.1. How to connect test leads.........................................................7
4.2. Battery Check-UP & Replacement...............................................7
4.3. Test leads check.......................................................................7
4.4. Rotary Switch positions.............................................................7
4.5. Buttons and a display Indicators................................................7
4.6. Resistance (Auto-ranging)........................................................7
5. Insulation Resistance Measurements...................................................8
6. Low Resistance (Continuity)Measurements..........................................9
7. AC/DC Voltage Measurements............................................................9
8. Battery Saver (Sleep Mode)................................................................9
9. Power Tools and Small Appliances........................................................9
4
1. SAFETY INFORMATION
• Read the following safety information carefully before attempting to
operate or service the meter.
• To avoid damages to the instrument do not apply the signals which
exceed the maximum limits shown in the technical specifications tables.
• Do not use the meter or test leads if they look damaged. Use extreme
caution when working around bare conductors or bus bars.
• Accidental contact with the conductor could result in electric shock.
• Use the meter only as specified in this manual; otherwise, the protection
provided by the meter may be impaired.
• Read the operating instructions before use and follow all safety
Information.
• Caution when working with voltages above 60V DC or 30V AC RMS. Such
voltages pose a shock hazard.
• Before taking resistance measurements or testing acoustic continuity,
disconnect circuit from main power supply and all loads from the circuit.
2. SAFETY SYMBOLS
Caution refer to this manual before using the meter.
Dangerous voltages.
Meter is protected throughout by double insulation or
reinforced insulation.
When servicing, use only specified replacement parts.
CE Comply with EN-61010-1
3. SPECIFICATIONS
3.1. General Information
Environment conditions:
1. Installation Categories III
2. Pollution Degree 2
3. Altitude up to 2000 meters
4. Indoor use only
5. Relatively humidity 80% max.
6. Operation Ambient 0~40ºC
Maintenance & Cleaning:
1. Repairs or servicing not covered in this manual should only be
performed by qualified personnel.
2. Periodically wipe the case with a dry cloth. Do not use abrasives or
solvents on this instruments.
5
Accuracies are specified in the way:
±(…% of reading +…digits) at 23ºC ±5ºC, below 80% RH.
Display Large LCD with dual display
Measurement Range 4000MΩ/125V, 4000MΩ/250V, 4000MΩ/500V,
4000MΩ/1000V, 400Ω/BZ, to 500V, decreasing
linearly to ≤1.5 at 1000V, 1000V/DCV, 750V/ACV
Sampling Rate 2.5 times per second.
Zero Adjustment Automatic adjustment.
Over Range Indicator "OL" of highest digit is displayed.
Low Battery Indication The is displayed when the battery Voltage
drops below the operating voltage.
Operating Temperature 0ºC to 40ºC (32ºF to 104ºF) and Humidity
below 80% RH
Storage Temperature -10ºC to 60ºC (14ºF to 140ºF) and Humidity
below 70% RH
Batteries 6 x AA
Dimensions 200(L) x 92(W) x 50(H) mm
Weight Approx. 700g including battery
Accessories Test Leads, 6 Batteries, Carrying Case, Manual.
Function Range
3.2. Electrical Specifications
OHMS
Range Resolution Accuracy Max. open Overload
Circuit Protection
Voltage
40.00Ω 0.01Ω 5.8V
±(1.2%+3) 250Vrms
400.0Ω 0.1Ω 5.8V
Continuity Beeper
Range Resolution Accuracy Max. open Overload
Circuit Protection
Voltage
0.01Ω Resistance≤35Ω 5.8V 250Vrms
Short circuit current ≧200mA
6
DC Voltage
Range Resolution Accuracy Input Overload
Impedance Protection
1000V 1V ±(0.8%+3) 10MΩ 1000Vrms
AC Voltage (40Hz~400Hz)
Range Resolution Accuracy Input Overload
Impedance Protection
750V 1V ±(1.2%+10) 10MΩ 750Vrms
Meg OHMS
Terminal Range Resolution Accuracy Test Short
Voltage Current Circuit
Current
125V 0.125~4.000MΩ 0.001MΩ ±(2%+10) 1mA ≤1mA
(0%~ 4.001~40.00MΩ 0.01MΩ ±(2%+10) @load
+10%) 40.01~400.0MΩ 0.1MΩ ±(4%+5) 125kΩ
400.1~4000MΩ 1MΩ ±(5%+5)
250V 0.250~4.000MΩ 0.001MΩ ±(2%+10) 1mA ≤1mA
(0%~ 4.001~40.00MΩ 0.01MΩ ±(2%+10) @load
+10%) 40.01~400.0MΩ 0.1MΩ ±(3%+5) 250kΩ
400.1~4000MΩ 1MΩ ±(4%+5)
500V 0.500~4.000MΩ 0.001MΩ ±(2%+10) 1mA ≤1mA
(0%~ 4.001~40.00MΩ 0.01MΩ ±(2%+10) @load
+10%) 40.01~400.0MΩ 0.1MΩ ±(2%+5) 500kΩ
400.1~4000MΩ 1MΩ ±(4%+5)
1000V 1.000~4.000MΩ 0.001MΩ ±(3%+10) 1mA ≤1mA
(0%~ 4.001~40.00MΩ 0.01MΩ ±(2%+10) @load
+10%) 40.01~400.0MΩ 0.1MΩ ±(2%+5) 1MΩ
400.1~4000MΩ 1MΩ ±(4%+5)
4. PARTS & CONTROLS
1. Digital Display
2. Data Hold Button; MAX/MIN
3. Lock Button
4. Backlight Button; ZERO
5. Test Button
6. Rotary Function switch
7. VΩ Jack
8. COM input jack
9. Pothook
10. Battery Cover
4.1. How to connect test leads.
On MΩ Range, and 400Ω/BZ, ACV, DCV, Connect the red test lead into the
"VΩ" terminal and the black lead into the "COM" terminal.
4.2. Battery Check-UP & Replacement
a) As battery power is not sufficient. LCD will display . Replacement of
6 pcs new batteries, type 1.5V size "AA" is required.
b) Place back the battery cover and four the screws.
4.3. Test leads check
Set the range select switch to the 400Ω range. With the tip and alligator
clip of the test leads connected. The indicator should read 00.0Ω. When
the leads are not connected the display will read infinity indicated by "OL".
This will ensure that test lead are under working condition.
4.4. Rotary Switch positions
Turn the Tester on by selecting any measurement
Lift ＜ 1000V, 500V, 250V, 125V (4000MΩ)
OFF 400Ω/ , 1000VDC, 750VAC ＞ Right
4.5. Buttons and a display Indicators
a) Button
HOLD/MAX.MIN: Press the “HOLD” button to ensure the current values
are held on the primary display. Once held on the display, hold down the
button for 2 seconds for the display to read the “MAX” value. Click again to
view the “MIN” value. Hold down the button for 2 seconds to exit.
LOCK: In the insulation resistance testing function, press the
"LOCK" button, and then push down the "TEST" key, it will allow hands
free operation to inject the high-voltage and enter the insulation resistance
testing status. Press the "TEST" button once more, it will shut off the high-
voltage and exit from the insulation resistance testing status.
7
87
TEST: In the insulation resistance testing function, pressing and
holding the "TEST" button, the meter will inject high-voltage, and
enter into the insulation resistance testing, release the "TEST" button and it
will cut off the high-voltage and exit form the insulation resistance testing.
ZERO/LIGHT: Press the “ZERO/LIGHT” button, the current values in the
primary display will be set to zero, (mainly used for 400Ω, the low
resistance testing), it will return if the button is pressed for 2 seconds, it
will enter directly into the “LIGHT” status, and the LCD backlight light up.
After 15 seconds, the backlight is shut off automatically, the same as
pressing for 2 seconds within 15s.
b) Display Indicators
The Primary Display： Indicates the current function testing values
The Secondary Display： It shows the output DCV while you test the
insulation resistance, and the battery voltage while the ACV
The Analog Bar： Indicates the current function testing value in
synchronous with the primary display.
:While testing the insulation resistance, the symbol " “ flashes
frequently if the voltage is over 30V.
: While testing the insulation resistance, the symbol " " flashes
frequently and the buzzer warns continually if the outside voltage is
over 30V. the symbol " " is indicated while LOΩ≤35Ω and the
buzzer warns continuously.
LOCK: Push down the "LOCK" button while you test the insulation
resistance and the symbol " " is indicated.
LOBAT： The display shows "LOBAT" when the voltage drops below 7.5V
MAX/MIN: Stand for the maximum or the minimum.
ZERO: Digital zero adjusting.
HOLD:The digital holding function for the primary display.
AC，DC: The indicator for the voltage property.
V，MΩ，Ω: The measured dimension units.
5. INSULATION RESISTANCE MEASUREMENTS
a) Turn the function switch from the "OFF" position to the left (4000MΩ/
1000V, 4000MΩ/500V, 4000MΩ/250V, 1000MΩ/125V) and choose one
of the voltage-block (there are 4 ranges namely, 4MΩ, 40MΩ, 400MΩ
and 4000MΩ can be switched automatically for every voltage-block.)
b) Connect two testing lines to the tested；
c) Push down and hold the "TEST" button /or press the "LOCK" keystoke
first and then the "TEST" button, if the object under test is live and its
voltage (AC/DC) is over 30V, it will refuse to work and no high-voltage
testing occurs, simultaneously, it shows ">30V" on the LCD, the symbol
" “ flashes, and the buzzer warns frequently. If the object under test
9
or its voltage is lower than 30V, it will enter into the formal testing
process and inject the high-voltage on the primary display, the
insulation resistance in MΩ is indicated in-phase with analog bar; on
the secondary display, the tested insulation voltage in V (DC) is
indicated, the symbol " " flashes and the buzzer warns frequently
d) Hands free operation "TEST" button or pushing down the "TEST"
button in the "LOCK” status can exit from the "LOCK" status and
shutoff the high-voltage，synchronously, the resistance values is
indicated in the primary display will be held, and the secondary display
still be in the status of monitoring the insulation voltage for the tested.
e) Subsequently, discharge the balance insulation voltage of the tested
through the inner switch of the meter. Turning the function switch can
exit automatically from testing status during the process.
6. LOW RESISTANCE (CONTINUITY) MEASUREMENTS
a) Set the range switch to 400Ω/ Position
b) Connect the red test lead to the VΩ terminal and black to the COM
terminal.
c) Connect the tips of the test leads to both ends of the circuit under test,
read resistance in Ω on the LCD. The two ranges (40.00/400.0Ω) can
be switched automatically; the primary display of the resistance in Ω,
flashes in synchronous with the analog bar.
d) When the impedance on circuit is below approximately ≤35Ω. It will
indicate by a continuous beeper.
e) The current isfrom200 to 220mA while the tested resistance is 0Ω
f) The high voltage symbol " " flashes along with a primary display of
">30V" and the buzzer warns frequently if the voltage (AC/DC) is more
than 30V.
7. AC/DC VOLTAGE MEASUREMENTS
a) Set the range switch to ACV or DCV position
b) Connect red test lead to "VΩ" terminal and black test lead to terminal
"COM".
c) Connect test prods of test leads IN PARALLEL to the circuit being
measured.
d) Read the voltage value on LCD.
8. BATTERY SAVER (SLEEP MODE)
The meter will automatically enter the "sleep mode" if there is no function
change or button press for 10 minutes, but it works as soon as you turn
the rotary function switch or push down any button.
9. POWER TOOLS AND SMALL APPLIANCES
This test would also apply to other similar equipment that has a line cord.
For double insulated power tools, the megohmmeter lead shown
1010
connected to the housing would be connected to some metal part lf the
tool (e.g. chuck, blade).
Note: The switch of the device must be in the "ON" position and the
main power should be disconnected.
MOTORS
AC-Disconnect the motor from the line by disconnecting the wires at the
motor terminals or by opening the main switch. If the main switch is used
and the motor also has a starter then the starter must be held, by some
means, in the "ON" position. In the latter case, the measured resistance
will include the resistance of the motor, wire and all other components
between the motor and the main switch. If a problem is indicated, the
motor and other components should be checked individually. If the motor
is disconnected at the motor terminals, connect one megohmmeter lead
to the grounded motor housing and the other lead to one of the motor
leads. DC-Disconnect the motor from the line. To test the brush rigging,
field coils and armature connect one megohmmeter lead to the grounded
motor housing and the other lead to the brush on the commutator. If the
resistance measurement indicates a problem, raise the brushes off the
commutator and separately test the armature, field coils and brush
rigging by connecting one megohmmeter lead to each of them
individually, leaving the other connected to the grounded motor housing.
The above also applies to DC Generators.
Indice
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