Major tech MT 770 User manual

MT 770

AC CLAMP METER

INSTRUCTION MANUAL

1. Measuring Limits ........................... 1

2. Safety Warnings ............................ 2

3. Features ......................................... 4

4. Instrument Layout ......................... 5

5. Specifications ................................ 5

6. AC Current Measurement ............. 7

7. DC Voltage Measurement ............. 8

8. AC Voltage Measurement ............. 9

9. Resistance Measurement ............. 10

10. Capacitance Measurement ........... 11

11. Frequency Measurement .............. 12

12. Duty Cycle Measurement ............. 13

13. Temperature Measurement .......... 14

14. Diode Test ...................................... 15

15. Continuity Testing ......................... 16

16. Other Functions ............................ 17

17. Battery Replacement .................... 18

18. Standard Accessories ................... 18

MEASURING LIMITS

AC Amperes : 0.1A to 1000A

DC Voltage : 0.1mV to 600V

AC Voltage : 0.1mV to 600V

Resistance : 0.1Ω to 40MΩ

Capacitance : 0.01 nF to 100µF

Frequency : 0.001 Hz to 10MHz

Duty Cycle : 0.5% to 99.0%

Temperature : -20 ºC to 1000 ºC

- 4 ºF to 1832 ºF

CONTENTS

1. SAFETY INFORMATION

This manual contains information that must be

followed for operating the meter safely and

maintaining the meter in a safe operating

condition. If the meter is not used in a manner

specified in this manual, the protection provided

by the meter may be impaired

The Model MT770 has been designed and

complies with IEC 61010-1 and EN 61010-1

Safety Requirements for Electronic Measuring

Apparatus.

WARNING

! Read through the operating instructions

throughly and understand the instructions

before operating the meter.

! Keep the manual at hand so as to enable

quick reference when necessary

! Ensure that the use of the meter is in its

intended applications and follow

measurement procedures described in this

manual.

! Follow all safety and operating instructions to

ensure maximum personal safety during the

use and operation of the meter.

! Failure to follow the above instructions may

cause injury, instrument damage and/or

damage to equipment under test.

!The symbol indicated on the meter means that

the user must refer to related parts in the

manual for safe operation of the meter. Be

sure to carefully read the instructions following

each symbol in this manual.

DANGER is reserved for conditions and

actions that are likely to cause serious or fatal

injury

WARNING is reserved for conditions and

actions that are likely to cause serious or fatal

injury

CAUTION is reserved for conditions and

actions that are likely to cause minor injury or

DANGER

! Never use the meter to measure voltages on a

circuit above the maximum allowable input

value on any function.

! Do not exceed the maximum allowable input

of any measurement range.

! Never touch exposed wiring, connections or

any live circuit when attempting to take

measurements.

! Do not attempt to make measurements in

flammable gaseous areas, fumes, vapor or

dust. The use of the instrument in these areas

may cause sparking , which can lead to an

explosion.

! Do not attempt to use the instrument if its

surface or your hand is wet

! Never open the battery compartment cover

when making measurements.

WARNING

! Always inspect the meter and test leads for

any signs of damage or abnormality before

use. If the meter or its accessories have any

structural defects such as broken test leads,

cracked cases, exposed metal parts or the

display is not reading, do not attempt to make

measurements.

! Do not turn the function switch whilst test

leads are connected to the meter.

! Do not install substitute parts or make

modifications to the meter. Return the meter

to your distributor for repair or re-calibration.

! Ensure the meter is switch off before opening

the battery cover when replacing the battery.

! Never replace a battery if the surface of the

meter is wet or moist.

CAUTION

! Before making measurements ensure that the

function selector switch is set on the

appropriate range position.

! Always make sure that the plug of each test

lead is inserted fully into the appropriate

terminal of the meter.

! Ensure that the function selector switch is set

to the “OFF” position after use. When the

meter will not be in use for a long period of

time, place it in storage after removing the

battery.

! Do not expose the meter to direct sunlight,

extreme temperatures or moisture.

! Do not use abrasives or solvents on the meter.

To clean it use a damp cloth and mild

detergent only.

Qualified and trained service technicians should

only perform calibration and repair of the meter.

2. FEATURES

! Large 4000 count LCD display with bright

white LED backlight.

! Wide measuring range from 0.01A AC up to

1000A AC

! Measures AC and DC Voltage up to 600 volts

! Measures resistance from 0.01Ω up to 40MΩ.

! Capacitance measurements up to 100µF

! Temperature measurement from -20ºC to

+1000ºC and -4ºF to +1832ºF.

! Designed to the international safety standard

IEC61010 CAT lll 600V / CAT ll 1000V,

Pollution degree 2.

! Auto Power Off after approximately 30

minutes to conserve battery life.

! Continuity Buzzer and Diode Test

! Frequency measurement up to 10MHz, with

Duty Cycle testing

! Data Hold switch used to freeze reading on

display

3. INSTRUMENT LAYOUT

Transformer

Jaws

Function

Switch

Jaw Trigger

Data Hold

& Backlight

Switch

Mode Switch

Display

COM

Terminal

Volt, Resistance,

Frequency,

Temperature

Terminal

Frequency,

Duty Cycle

Switch

Range Selector

Switch for Volts

and Resistance

Clamp Size

Diode Test

Continuity Check

Low Battery Indication

Overrange Indication

Measurements Rate

Input Impedance

Display

AC Current

AC Voltage Bandwidth

Operating Temperature

Storage Temperature

Relative Humidity

Over Voltage

Battery

Auto Power Off

Dimensions

Weight

30mm Opening Approx

Test Current of 0.3mA typical;

Open circuit voltage 1.5V DC

Threshold <100Ω; Test current <1mA

“ “ is displayed

“OL” is displayed

2 per second, nominal

7.8MΩ (VDC and VAC)

4000 count LCD

50/60Hz (AAC)

50/60Hz (VAC)

-10ºC to 50ºC (-14ºF to 122ºF)

-30ºC to 60ºC (-14ºF to 140ºF)

Up to 85%

Category lll 600V

One PP3 “9V” Battery

Approx 30 minutes

229 x 80 x 49mm

303g

4. SPECIFICATIONS

Range

AC Current

Measuring Range Resolution

40A

400A

1000A

0 ~ 40.00A

0 ~ 400.0A

0 ~ 1000A

0.01 A

0.1 A

1 A

Accuracy (% of Reading)

± (2.5% + 10 digits)

± (2.5% + 5 digits)

± (3.0% + 5 digits)

Range

DC Voltage

Measuring Range Resolution

400mV

40V

400V

600V

0 ~ 400.0mV

0 ~ 4.000V

0 ~ 40.00V

0 ~ 400.0V

0 ~ 600V

0.1 mV

0.001 V

0.01 V

0.1 V

1 V

Accuracy (% of Reading)

± (0.8% + 3 digits)

± (1.5% + 3 digits)

± (2.0% + 3 digits)

Range

AC Voltage

Measuring Range Resolution

400mV

40V

400V

600V

0 ~ 400.0mV

0 ~ 4.000V

0 ~ 40.00V

0 ~ 400.0V

0 ~ 600V

0.1 mV

0.001 V

0.01 V

0.1 V

1 V

Accuracy (% of Reading)

± (0.8% + 10 digits)

± (1.8% + 5 digits)

± (2.5% + 5 digits)

Range

Resistance

Measuring Range Resolution

400Ω

4kΩ

40kΩ

400kΩ

4MΩ

40MΩ

0 ~ 400.0Ω

0 ~ 4.000kΩ

0 ~ 40.00kΩ

0 ~ 400.0kΩ

0 ~ 4.000MΩ

0 ~ 40.00MΩ

0.1 Ω

1Ω

10 Ω

100 Ω

1 kΩ

10 kΩ

Accuracy (% of Reading)

± (1.0% + 4 digits)

± (1.5% + 2 digits)

± (2.5% + 3 digits)

± (3.5% + 5 digits)

Note: No Autoranging on 400mV AC Range

Range

Capacitance

Measuring Range Resolution

40nF

400nF

4µF

40µF

100µF

0 ~ 40.00nF

0 ~ 400.0nF

0 ~ 4.000µF

0 ~ 40.00µF

0 ~ 100.0µF

0.01 nF

0.001 µF

0.01 µF

0.1 µF

Accuracy (% of Reading)

± (5.0% + 20 digits)

± (3.0% + 5 digits)

± (3.5% + 5 digits)

± (5.0% + 5 digits)

Range

Frequency

Measuring Range Resolution

5Hz

50Hz

500Hz

5kHz

50kHz

500kHz

5MHz

10MHz

0 ~ 5.000Hz

0 ~ 50.00Hz

0 ~ 500.0Hz

0 ~ 5.000kHz

0 ~ 50.00kHz

0 ~ 500.0kHz

0 ~ 5.000MHz

0 ~ 10.00MHz

0.001 Hz

0.01 Hz

0.1 Hz

1 Hz

10Hz

100 Hz

1 kHz

10 kHz

Accuracy (% of Reading)

± (1.5% + 5 digits)

± (1.2% + 2 digits)

Sensitivity: 10Vrms min

± (1.2% + 10 digits)

Range

Duty Cycle

Measuring Range Resolution

%0.5% ~ 99.0%

Pulse width:

100µs - 100ms

0.1 %

Accuracy (% of Reading)

± (1.2% + 2 digits)

Range

Temperature

Measuring Range Resolution

ºC

ºF

-20.0ºC ~ 400.0ºC

400ºC ~ 1000ºC

-4.0ºF ~ 400.0ºF

400ºF ~ 1832ºF

0.1 ºC

1 ºC

0.01 ºF

1 ºF

Accuracy (% of Reading)

± (3.0% + 5ºC)

± (3.0% + 7ºF)

5. AC CURRENT MEASUREMENT

WARNING: Ensure that the test leads are

disconnected from the meter before making

current measurements.

1. Set the function switch to or or

range position, and make sure that the

current under test does not exceed the upper

limit of the measuring range you have

selected.

2. Press the trigger to open up the transformer

jaws and clamp around the single conductor

under test.

3. Read the display.

Note: • During current measurements keep the

transformer jaws fully closed, otherwise

this will affect the accuracy of the

measurement.

• When large currents the transformer

jaws may buzz. This is not a fault and

does not affect the accuracy of the

reading.

40A

400A

1000A

Correct Current

Measurement

Incorrect Current

Measurement

6. DC VOLTAGE MEASUREMENT

1. Set the function switch to range

position. The meter automatically defaults to

DC Volts.

2. Insert the red test lead into the “V Ω ºC ºF HZ”

input terminal and the black lead to the “COM”

terminal.

3. Connect the other end of the test leads to the

circuit under test.

4. Read the display. If a “-” sign is displayed, the

red lead is the negative potential.

Note: • The meter is set to default to “Auto

Range” mode.

• Pressing the button transforms

the meter into a ‘Manual Range” mode.

This means that the user will have to

depress this button to select the correct

range for the voltage being measured.

• In order to return back to the “Auto

Range” mode, hold down the

button for 3 seconds.

RANGE

Battery

AC Supply

7. AC VOLTAGE MEASUREMENT

1. Set the function switch to range

position.

2. Press the ” button to select the AC Volt

range. The meter automatically defaults to DC

Volts.

3. Insert the red test lead into the “V Ω ºC ºF HZ”

input terminal and the black lead to the “COM”

terminal.

4. Connect the other end of the test leads to the

circuit under test. Take the reading on the

display.

Note: • The meter is set to default to “Auto

Range” mode.

• Pressing the button transforms

the meter into a ‘Manual Range” mode.

This means that the user will have to

depress this button to select the correct

range for the voltage being measured.

• In order to return back to the “Auto

Range” mode, hold down the

button for 3 seconds.

• To test Frequency on AC Voltage simple

press the button.

MODE

RANGE

•

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