Major tech MT775 User manual
MT775
AC/DC TRMS
CLAMP METER
INSTRUCTION MANUAL
II
2
Contents Page no
3
1. Safety ..................................................................................... 4
2. Description ............................................................................ 5
2.1. Meter Description .............................................................. 5
10. Temperature Probe Replacement ..................................... 14
4.3. Resistance Measurement ............................................... 11
5.4. REL/Backlight Button....................................................... 14
3.2. General Specifications ...................................................... 9
4.4. Diode and Continuity Measurements............................... 11
4. Operation ............................................................................. 10
7. Maintenance ........................................................................ 14
3.1. Specifications ................................................................... 7
4.2. AC/DC Voltage Measurement ......................................... 11
5.2. RANGE Button ................................................................ 13
2.2. Symbols Used on LCD Display ...........................................6
4.8. Non-Contact AC Voltage Measurements ......................... 13
4.1. AC/DC Current Measurement ......................................... 10
8. Cleaning and Storage .......................................................... 14
9. Battery Replacement .......................................................... 14
3. Specifications ........................................................................ 7
5. Button ................................................................................... 13
4.5 .Capacitance Measurements ........................................... 12
4.6. Frequency or % Duty Cycle Measurements .................... 12
5.3. PEAK/VFD Button ........................................................... 13
5.5. Data Hold/Flashlight Button ............................................. 14
5.1. MODE/INRUSH Button ................................................... 13
6. Battery Replacement ........................................................... 14
4.7. Temperature Measurements ........................................... 12
This symbol, adjacent to a terminal, indicates that, under
normal use, hazardous voltages may be present.
Double insulation.
This symbol, adjacent to another symbol or terminal, indicates
the user must refer to the manual for further information.
4
1. Safety
!
1.1. lnternational Safety Symbols
• When changing ranges using the selector switch always disconnect the
test leads from the circuit under test.
• Set the function switch OFF when the meter is not in use.
• Remove the battery if the meter is to be stored for long periods.
• Do not exceed the maximum rated input limits.
1.4. CAUTIONS
• Inspect the condition of the test leads and the meter itself for any
damage before operating the meter. Repair or replace if damaged before
use.
1.3. WARNINGS
• Do not exceed the maximum allowable input range of any function.
• Set function switch to the appropriate position before measuring.
1.2. SAFETY NOTES
• Do not apply voltage to meter when resistance function is selected.
• When measuring volts do not switch to current/resistance modes.
• Always remove the test leads before replacing the battery.
• Use great care when making measurements if the voltages are greater
than 25VAC RMS or 35VDC. These voltages are considered a shock
hazard.
• Improper use of this meter can cause damage, shock, injury or death.
Read and understand this user manual before operating the meter.
• Always discharge capacitors and remove power from the device under
test before performing Diode, Resistance or Continuity tests.
• Voltage checks on electrical outlets can be difficult and misleading
because of the uncertainty of connection to the recessed electrical
contacts. Other means should be used to ensure that the terminals are
not “live”.
5
• If the equipment is used in a manner not specified by the manufacturer,
the protection provided by the equipment may be impaired.
2. Input Limits
4. Relative / Backlight Button
1. Current Clamp
3. Clamp Trigger
2.1. Meter Description
2. Non-Contact AC Voltage Indicator
Light
5. LCD Display
6. MODE / INRUSH Select Button
2. Description
13. COM Input Jack
7. RANGE Button
11. Battery Cover
9. Rotary Function Switch
14. VΩHz% CAP TEMP Jack
10. Data Hold / Flashlight Button
12. Flashlight
8. PEAK / VFD Button
A AC/DC
V AC/DC
Frequency, Resistance,
Diode, Continuity,
Capacitance Test
Temperature
1000A
1000V DC/AC
1000V DC/AC
1000V DC/ AC
Function Maximum Input
WARNING
TO AVOID ELECTRICAL
SHOCK REMOVE TEST
LEADS BEFORE OPENING
CASE OR BATTERY COVER.
DO NOT OPERATE WITH
BATTERY COVER OPEN.
1.5V AAAX3
1
2
3
5
4
6
7
8
9
10
11
12
13 14
V
Hz%
V
Temp
°C°F
CAP
Ω
OFF
LoZ V
Hz%
600A 1000A
AC TRMS CLAMP METER
AUTO POWER OFF
CAT III 1000V
CAT IV 600V
CAP
V Hz%
Ω
Temp
COM
REL
MODE RANGE PEAK
INRUSH
6
8. Auto Range Mode
14. Variable Frequency Drive Voltage Value
15. Units of Measure List
1. Low Impedance Input Mode
5. Low Battery
9. Diode Test Mode
12. Relative Mode
16. Frequency/Duty Cycle Test Mode
11. Peak Voltage Value
4. AC (Alternating Current)
7. Auto Power Off
10. Audible Continuity
2. DC (Direct Current)
3. Minus Sign
6. Inrush Current Mode
13. Data Hold Mode
17. 6000 Count Measurement Reading
2.2. Symbols Used on LCD Display
1
3
4
7 8 910 11 12 13 14
6
15
17
16
2
5
7
3.1. Specifications
3. Specifications
Range & Resolution
600.0A
1000A
Accuracy ±(% of reading+digits)
±(2.5% + 8 digits)
±(2.8% + 8 digits)
Function
AC Current
(50/60Hz)
600.0A
1000V ±(2.8% + 5 digits)
DC Current ±(2.5% + 5 digits)
Inrush current Maximum Input: 1000A.
Over range protection: Maximum input 1000A.
Frequency Response: 50Hz to 60Hz True RMS.
Accuracy specified from 5% to 100% of the measuring range.
6.000V
60.00V
600.0V
1000V
±(1.5% + 5 digits)
AC Voltage
(50-400Hz)
AC voltage bandwidth: 50 to 400Hz (Sine); 50/60 (All wave).
Maximum Input: 1000V AC RMS.
Variable frequency Drive TEST AC voltage range: 100V - 600V.
Accuracy specified from 5% to 100% of the measuring range.
VFD, PEAK Maximum Input: 1000V.
Range & Resolution
Accuracy ±(% of reading+digits)
Function
6.000V
60.00V
300.0V
±(3.0% + 40 digits)
LoZ AC
Voltage
Maximum Input: 300V AC
Range & Resolution
Accuracy ±(% of reading+digits)
Function
600.0mV
6.000V
60.00V
600.0V
1000V
±(0.5% + 5 digits)
±(1.5% + 2 digits)
DC Voltage
Maximum Input: 1000V DC
Range & Resolution
Accuracy ±(% of reading+digits)
Function
8
60.00nF
600.0nF
6.000µF
60.00µF
600.0µF
6.000mF
60.00mF
100.0mF
±(4.0% + 20 digits)
±(3% + 5 digits)
±(5% + 5 digits)
±(5% + 8 digits)
±(5% + 15 digits)
Capacitance
Input Protection: 300V DC or 300V AC RMS.
Range & Resolution
Accuracy ±(% of reading+digits)
Function
600.0Ω
6.000KΩ
60.00KΩ
600.0KΩ
6.000MΩ
60.00MΩ
±(1.0% + 4 digits)
±(1.5% + 2 digits)
±(2.5% + 3 digits)
±(3.5% + 5 digits)
Resistance
Input Protection: 300V DC or 300V AC RMS.
Range & Resolution
Accuracy ±(% of reading+digits)
Function
Note: Accuracy is given as ±(% of reading + counts of least significant digit) at 23°C ±5°C,
with relative humidity less than 80%RH. AC voltage and current shall be subject to sine
wave.
9.999Hz to 99.99kHz ±(1.2% + 5 digits)
Frequency
Sensitivity:
=>5VRMS
Range & Resolution
Accuracy ±(% of reading+digits)
Function
10.0% to 90.0% ±(1.2% + 2 digits)
Duty Cycle
Sensitivity:
=>5VRMS
Input Protection: 300V DC or 300V AC RMS.
Range & Resolution
Accuracy ±(% of reading+digits)
Function
-20.0 to 1000°C
-4.0 to 1832°F
±(3% + 5°C)
±(3% + 9°F)
Temp
(Type-K)
(Probe accuracy not included)
Input Protection: 300V DC or 300V AC RMS.
Range & Resolution
Accuracy ±(% of reading+digits)
Function
9
Clamp Size
Diode Test
Overrange Indication
TRMS
Continuity Check
Low Battery Indication
Measurements Rate
Input Impedance
Display
AC Current
AC Voltage Bandwidth
Operating Temperature
Storage Humidity
Operating Altitude
Over Voltage
Operating Humidity
Weight
Auto Off
Safety
Dimensions
Battery
Storage Temperature
3.2. General Specifications
33mm approx
2 per second, nominal
<80%
2000 meters maximum.
250 x 78 x 40mm
Three (3) x 1.5V AAA Battery
50 - 400Hz (VAC)
-20 to 60°C (-4 to 140°F)
50 - 60Hz (AAC)
Approx. 30 minutes
For indoor use and in accordance with the
requirements for double insulation to
IEC1010-1 (2001): EN61010-1 (2001)
Overvoltage Category III 1000V and Category
IV 600V, Pollution Degree 2.
10M (VDC and VAC)
5 to 40°C (41 to 104°F)
Category IV 600V
Test current of 0.3mA typical; Open circuit
voltage 3.2V DC typical.
350g
The AC voltage and AC current of this
instrument are measured by TRMS. True RMS
measurement is different from mean
measurement. The mean measurement
method can only measure the symmetric
waveform, such as sine wave. True RMS
measurements can reliably measure any
irregular waveform and obtain valid values for
AC voltage or AC current.
“OL” is displayed
6000 counts LCD
Threshold <=50Ω; Test current < 0.5mA
“ ” is displayed
Max 80% up to 31°C decreasing linearly to
50% at 40°C
10
CorrectIncorrect
2. If the range to be measured is not known, select the higher range first
then move to the lower range if necessary.
3. Press the trigger to open jaw. Fully enclose one conductor to be
measured.
1. Set the Function switch to the 1000A AC/DC, 600A AC/DC range.
4. The clamp meter LCD will display the reading.
4. Operation
NOTICES: Read and understand all warning and precaution statements
listed in the safety section of this operation manual prior to using this
meter. Set the function select switch to the OFF position when the meter is
not in use.
4.1. AC Current Measurements
WARNING: Ensure that the test leads are disconnected from the meter
before making current clamp measurements.
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