Major tech MT 770 User manual

MT770
AC TRMS
CLAMP METER
INSTRUCTION MANUAL
II

2

Contents Page no
3
1. Safety ..................................................................................... 4
2. Description ............................................................................ 5
2.1. Meter Description .............................................................. 5
2.2. Symbols Used on LCD Display ...........................................6
3. Specifications ........................................................................ 7
3.1. Specifications ................................................................... 7
3.2. General Specifications ...................................................... 9
4. Operation ............................................................................. 10
4.1. AC Current Measurement ................................................ 10
4.2. AC/DC Voltage Measurement ......................................... 11
4.3. Resistance Measurement ............................................... 11
4.4. Diode and Continuity Measurements............................... 11
4.5 .Capacitance Measurements ........................................... 12
4.6. Frequency or % Duty Cycle Measurements .................... 12
4.7. Temperature Measurements ........................................... 12
4.8. Non-Contact AC Voltage Measurements ......................... 13
5. Button ................................................................................... 13
5.1. MODE/INRUSH Button ................................................... 13
5.2. RANGE Button ................................................................ 13
5.3. PEAK/VFD Button ........................................................... 13
5.4. REL/Backlight Button....................................................... 14
5.5. Data Hold/Flashlight Button ............................................. 14
6. Battery Replacement ........................................................... 14
7. Maintenance ........................................................................ 14
8. Cleaning and Storage .......................................................... 14
9. Battery Replacement .......................................................... 14
10. Temperature Probe Replacement ..................................... 14

This symbol, adjacent to another symbol or terminal, indicates
the user must refer to the manual for further information.
This symbol, adjacent to a terminal, indicates that, under
normal use, hazardous voltages may be present.
Double insulation.
4
1. Safety
!
1.1. lnternational Safety Symbols
1.2. SAFETY NOTES
• Do not exceed the maximum allowable input range of any function.
• Do not apply voltage to meter when resistance function is selected.
• Set the function switch OFF when the meter is not in use.
1.3. WARNINGS
• Set function switch to the appropriate position before measuring.
• When measuring volts do not switch to current/resistance modes.
• When changing ranges using the selector switch always disconnect the
test leads from the circuit under test.
• Do not exceed the maximum rated input limits.
1.4. CAUTIONS
• Improper use of this meter can cause damage, shock, injury or death.
Read and understand this user manual before operating the meter.
• Always remove the test leads before replacing the battery.
• 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.
• Use great care when making measurements if the voltages are greater
than 25VAC RMS or 35VDC. These voltages are considered a shock
hazard.
• Remove the battery if the meter is to be stored for long periods.
• 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”.

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• 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
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
2.1. Meter Description
1. Current Clamp
2. Non-Contact AC Voltage Indicator
Light
3. Clamp Trigger
4. Relative / Backlight Button
5. LCD Display
6. MODE / INRUSH Select Button
2. Description
7. RANGE Button
8. PEAK / VFD Button
9. Rotary Function Switch
10. Data Hold / Flashlight Button
11. Battery Cover
12. Flashlight
13. COM Input Jack
14. VΩHz% CAP TEMP Jack
A AC
V AC/DC
Frequency, Resistance,
Diode, Continuity,
Capacitance Test
Temperature
1000A
1000V DC/AC
1000V DC/AC
1000V DC/ AC
Function Maximum Input

6
1
3
4
7 8 910 11 12 13 14
6
15
17
16
2
5
1. Low Impedance Input Mode
2. DC (Direct Current)
3. Minus Sign
4. AC (Alternating Current)
5. Low Battery
6. Inrush Current Mode
7. Auto Power Off
8. Auto Range Mode
9. Diode Test Mode
10. Audible Continuity
11. Peak Voltage Value
12. Relative Mode
13. Data Hold Mode
14. Variable Frequency Drive Voltage Value
15. Units of Measure List
16. Frequency/Duty Cycle Test Mode
17. 6000 Count Measurement Reading
2.2. Symbols Used on LCD Display

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3. Specifications
3.1. Specifications
Range & Resolution
600.0A
1000A
Accuracy ±(% of reading+digits)
±(2.5% + 8 digits)
±(2.8% + 8 digits)
Function
AC Current
(50/60Hz)
Over range protection: Maximum input 1000A.
Accuracy specified from 5% to 100% of the measuring range.
Frequency Response: 50Hz to 60Hz True RMS.
Inrush current Maximum Input: 1000A.
6.000V
60.00V
600.0V
1000V
±(1.5% + 5 digits)
AC Voltage
(50-400Hz)
Variable frequency Drive TEST AC voltage range: 100V - 600V.
AC voltage bandwidth: 50 to 400Hz (Sine); 50/60 (All wave).
Accuracy specified from 5% to 100% of the measuring range.
Maximum Input: 1000V AC RMS.
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

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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
TRMS
Diode Test
Continuity Check
Low Battery Indication
Overrange Indication
Measurements Rate
Input Impedance
Display
AC Current
AC Voltage Bandwidth
Operating Temperature
Storage Temperature
Operating Humidity
Storage Humidity
Operating Altitude
Over Voltage
Battery
Auto Off
Dimensions
Weight
Safety
33mm approx
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.
Test current of 0.3mA typical; Open circuit
voltage 3.2V DC typical.
Threshold <=50Ω; Test current < 0.5mA
“ ” is displayed
“OL” is displayed
2 per second, nominal
10M (VDC and VAC)
6000 counts LCD
50 - 60Hz (AAC)
50 - 400Hz (VAC)
5 to 40°C (41 to 104°F)
-20 to 60°C (-4 to 140°F)
Max 80% up to 31°C decreasing linearly to
50% at 40°C
<80%
2000 meters maximum.
Category III 1000V
Three (3) x 1.5V AAA Battery
Approx. 30 minutes
250 x 70 x 40mm
350g
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.
3.2. General Specifications

10
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.
1. Set the Function switch to the 1000A AC, 600A AC range.
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.
4. The clamp meter LCD will display the reading.
CORRECTINCORRECT