Major tech MT775 Bedienungsanleitung

MT775

AC TRUE RMS CLAMP METER

INSTRUCTION MANUAL

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

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

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

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

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

7. Data Hold Function ......................... 7

8. Peak Hold Function ........................ 7

9. LCD Backlight ................................. 7

9. AC Current Measurement .............. 8

10. DC Voltage Measurement .............. 9

11 AC Voltage Measurement ............. 10

12. Resistance Measurement ................ 11

13. Capacitance Measurement ........... 12

14. Frequency Measurement ............... 13

15. Temperature Measurement ........... 14

16. Diode Test ........................................ 15

17. Continuity Testing .......................... 16

18. Auto Power Off ............................... 17

19. Calibration ...................................... 17

20. Guarantee ....................................... 17

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

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

1. 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 : 0.001 nF to 40mF

Frequency : 0.001 kHz to 4kHz

Temperature : -40 ºC to 1000 ºC

- 40 ºF to 1832 ºF

CONTENTS

2. 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 MT775 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.

3. FEATURES

! True RMS measurement of AC Current and

AC Voltage

! Large 4000 count LCD display with bargraph

and a 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 40mF

! Temperature measurement from -40ºC to

+1000ºC and -40ºF to +1832ºF.

! Designed to the international safety standard

IEC61010 CAT lll 600V / CAT ll 1000V,

Pollution degree 2.

! Auto Power Off after approximately 20

minutes to conserve battery life.

! Continuity Buzzer and Diode Test

! Frequency measurement up to 4kHz

! Peak Hold to record the minimum and

maximum readings for current and voltage.

! Data Hold switch used to freeze reading on

display

4. INSTRUMENT LAYOUT

Transformer

Jaws

Function

Switch

Jaw Trigger

Data Hold

Switch

Mode Switch

Display with

Bargraph

COM

Terminal

Volt, Resistance,

Frequency,

Temperature

Terminal

Backlight

Switch

Peak Hold

Selector Switch

for Volts and

Current

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 <35Ω; Test current <1mA

“ “ is displayed

“OL” is displayed

2 per second, nominal

10MΩ (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 20 minutes

229 x 80 x 49mm

303g

5. 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)

± (2.8% + 10 digits)

± (2.8% + 8 digits)

± (3.0% + 8 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% + 2 digits)

± (1.5% + 2 digits)

± (2.0% + 2 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)

± (1.0% + 10 digits)

± (1.5% + 8 digits)

± (2.0% + 8 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% + 5 digits)

± (3.5% + 10 digits)

Note: No Autoranging on 400mV AC Range

Range

Frequency

Measuring Range Resolution

4kHz 0 ~ 4.000kHz 0.001 kHz

Accuracy (% of Reading)

± (1.5% + 2 digits)

Sensitivity: 5Vrms min

Range

Temperature

Measuring Range Resolution

ºC

ºF

-40ºC ~ 1000ºC

-40.0ºF ~ 1832ºF

1 ºC

1 ºF

Accuracy (% of Reading)

± (2.5% + 3ºC)

± (2.5% + 5ºF)

Capacitance

Range Measuring Range Resolution

4nF

40nF

400nF

4µF

40µF

400µF

4mF

40mF

0 ~ 4.000nF

0 ~ 40.00nF

0 ~ 400.0nF

0 ~ 4.000µF

0 ~ 40.00µF

0 ~ 400.0µF

0 ~ 4.000mF

0 ~ 40.00mF

0.001 nF

0.01 nF

0.1 nF

0.001 µF

0.01 µF

0.1 µF

0.001mF

0.01mF

Accuracy (% of Reading)

± (5.0% + 30 digits)

± (5.0% + 20 digits)

± (3.0% + 5 digits)

± (4.0% + 10 digits)

± (4.5% + 10 digits)

± (5.0% + 10 digits)

6. DATA HOLD

This is a function used to freeze the reading on

the display, ideal for later viewing.

1. Press the button once. When the Hold is

activated, the meter beeps, freezes the

reading, and displays the “HOLD” indicator on

the LCD.

2. To deactivate the “HOLD” function, press

button once, the meter will beep and the meter

will start reading new measurements.

7. PEAK HOLD

This is a function used to record the maximum

and minimum readings on the display for the

voltage and current ranges.

1. Press the button once. This will record

the “PEAK” maximum, the meter beeps, and

displays the “P MAX” indicator on the LCD.

2. Press the button again. This will record

the “PEAK” minimum, the meter beeps, and

displays the “P MIN” indicator on the LCD.

3. To deactivate the “PEAK” function, press

button for 3 seconds,the meter will beep and

the meter will start reading new measurements.

8. LCD BACKLIGHT

The backlight is ideally used in dark or dimly lit

areas.

1. Press the button for 3 seconds, and the

bright white light will come on.

2. To turn off the backlight press the button

for 3 seconds.

Note: • The use of the backlight will reduce the

battery life considerably.

PEAK

HOLD

9. AC TRUE RMS 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

10. 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 TEMP 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 hold button will

allow the user to record the peak

maximum and minimum readings on the

AC volt range. See page 7 for further

instructions for “PEAK” Hold function.

Battery

PEAK

__ __

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