MAJOR TECH MTD75T 800A AC-DC True Rms Digital Clamp Meter Instruction Manual

: June 9, 2024
: MAJOR TECH

Table of Contents

SAFETY
- lnternational Safety Symbols
Description
General Specifications
SPECIFICATIONS
OPERATION
Maintenance
Customer Support
References
Read User Manual Online (PDF format)
Download This Manual (PDF format)

MAJOR TECH MTD75T 800A AC-DC True Rms Digital Clamp Meter Instruction Manual

SAFETY

lnternational Safety Symbols

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.

Application around and removal from uninsulated hazardous live conductors is permitted.

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.
Remove the battery if meter is to be stored for longer than 60 days.

Warnings

Set function switch to the appropriate position before measuring.
When measuring volts do not switch to current/resistance modes.
Do not measure current on a circuit whose voltage exceeds 600V.
When changing ranges always disconnect the test leads from the circuit under test.

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 or fuses.
Inspect the condition of the test leads and the meter itself for any damage before operating the meter. Repair or replace any damage 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.
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”.
If the equipment is used in a manner not specified by the manufacturer, the protection provided by the equipment may be impaired.

Function	Maximum Input
A DC , A AC	800A DC/AC
V DC, V AC	1000V DC/AC
Resistance, Capacitance, Frequency, Diode Test, Temperature	250V DC/AC

Description

Meter Description

NCV Test
Current clamp
LED Flashlight
Non-contact AC voltage indicator light
Clamp trigger
Rotary Function switch
SELECTOR mode range button
Data Hold and Flashlight and LCD backlight button
RANGE button and DCA Zero
Frequency and % Duty Cycle button
LCD display
COM input jack
V Ω Diode Continuity CAP TEMP Hz% jack
Battery Cover

Display Icons

Button	Operation Performed
Data Hold
Minus sign	Negative reading display
0 to 5999	Measurement display digits
DCA Zero
NCV	Non-Contact Voltage
APO	Auto Power Off
AUTO	Auto Range mode
DC	Direct Current/Voltage
AC	Alternating Current/Voltage
Low battery
mV or V	Milli-volts or Volts (Voltage)
Ω	Ohms (Resistance)
A	Amperes (Current)
F	Farad (Capacitance)
Hz/%	Hertz (Frequency)/Percent(duty ratio)
°F and °C	Fahrenheit and Celsius units (Temperature)
n, m, μ, M, k	Unit of measure prefixes: nano, milli, micro, mega, and kilo
Continuity test
****	Diode test

General Specifications

Basic Functions Range

Clamp jaw opening| 28mm approx.
Display| 6000 Count (3-5/6 digits backlit LCD
Low Battery indication| is displayed
Over-range indication| display
Measurement rate| 3 readings per second, nominal
Temperature sensor| Type K thermocouple 4mm terminals
Input Impedance| 10MΩ (VDC and VAC)
AC response| TrueRMS (AAC and VAC)
ACV Bandwidth| 2KHZ
Operating Temperature| 5°C to 40°C (41°F to 104°F)
Storage Temperature| -20°C to 60°C (-4°F to 140°F)
Operating Humidity| Max 80% up to 31°C (87°F) Decreasing linearly to 50% at 40°C (104°F)
Storage Humidity| <80%
Operating Altitude| 2000meters (7000ft.) maximum.
Battery| 2 x 1.5V AAA Battery
Battery life| Approx. 30h (backlight ON), Approx. 100h (backlight OFF)
Auto power OFF| After approx. 15 minutes
Dimensions| 123 (W) x 270 (D) x 39 (H)mm
Weight| 280g
Safety| For indoor use and in the requirement For double insulation IEC1010-1(2001): EN61010-2-030, EN61010-2-032,
EN61010-2-033 Overv oltage Category III 600V, Pollution Degree 2.

SPECIFICATIONS

AC True RMS Current

Range	Resolution	Accuracy (% of reading + digits)
60.00A	0.01A	±1.5% of rdg ± 5 digits
600.0A	0.1A
800.0A	1A

Over range protection: Maximum input 1000A
Accuracy specified from 5% to 100% of the measuring range
Frequency Response: 40Hz to 1kHz True RMS

DC Current

Range	Resolution	Accuracy (% of reading + digits)
0.00A	0.01A	±1.5% of rdg ± 5 digits
600.0A	0.1A
800.0A	1A

Over range protection: Maximum input 1000A

AC Voltage

Range	Resolution	Accuracy (% of reading + digits)
6.00V	1mV	±0.8% of rdg ± 5 digits
60.0V	10mV
600V	100mV

Input impedance 10MΩ. Overload protection 1000V AC RMS.
Frequency response 6000V at 40Hz to 1kHz (sine), other ranges 40/2kHz (all wave).

DC Voltage

Range	Resolution	Accuracy (% of reading + digits)
600mV	0.1mV	±1.0% of rdg ± 5 digits
6.00V	1mV	±0.5% of rdg ± 5 digits
60.0V	10mV
600V	100mV

Input impedance 10MΩ. Overload protection 1000V RMS

Resistance

Range	Resolution	Accuracy (% of reading + digits)
600.0Ω	0.1Ω	±0.8% of rdg ± 5digits
6.000kΩ	1Ω	±0.8% of rdg ± 1 digits
60.00kΩ	10Ω
600.0kΩ	100Ω
6.000MΩ	1kΩ
60.00MΩ	10kΩ	±1.0% of rdg ± 5 digits

Input Protection: 250V DC or 250V AC RMS

Note:

a. On 600Ω range, short the test leads to measure lead resistance, then subtract the value from the real measurement
b. When measuring resistance over 1MΩ, it is normal that the reading reacts slowly, wait until reading is stable

Capacitance (Auto Ranging)

Range	Resolution	Accuracy (% of reading + digits)
6nF	1pF	± (5.0% rdg ± 10 digits)
60nF	10pF	± (2.5% rdg ±5 digits)
600nF	100pF
6uF	1nF
60uF	10nF
600uF	100nF	± (5% rdg ± 10 digits)
6mF	1uF
60mF	10uF

Ensure capacitors are discharged before measuring value

Warning DO NOT apply voltage to this range

Frequency (Auto Ranging)

Range	Resolution	Accuracy (% of reading + digits)
10Hz	0.01Hz	± (0.5% rdg ± 4 digits)
100Hz	0.1Hz
1kHz	1Hz
10kHz	10Hz
100kHz	100Hz
1MHz	1kHz
10MHz	10kHz

Input Protection: 250V DC or 250V AC RMS
Input sensitivity >0.7V

Temperature

Range	Resolution	Accuracy (% of reading + digits)
-40°C to	1°C	<400°C: ±1.0% ± 5°C
+1000°C	≥400°C: ±1.5% ± 15°C
0°F to	1°F	<750°F: ±1.0% ± 5°C
+1832°F	≥750°F: ±1.5% ± 15°C

Sensor: Type K Banana Plug Thermocouple
Warning DO NOT apply voltage to this range

Diode & Continuity

Function	Testing Condition	Reading
Diode	Forward DCA is approx. 0.8mA, open circuit Voltage MAX. 2.2V	Forward

voltage drop of Diode
Continuity| Open circuit Voltage MAX. 2V| Buzzer makes a continuous sound while resistance is less than (50Ω)

Input Protection: 250V DC or 250V AC RMS
Warning DO NOT apply voltage to Continuity range

OPERATION

NOTES: Read and understand all Warning and Caution statements in this operation manual prior to using this meter. Set the function select switch to the OFF position when the meter is not in use.

AC Current Measurements

WARNING: Ensure that the test leads are disconnected from the meter before making current clamp measurements.

Set the Function switch to the A Range. If the approx. range of the measurement is not known, select Auto Range.
Press the /RANGE button to zero the meter display.
Use SELECT Button to select AC
Press the trigger to open jaw. Fully enclose only one conductor. For optimum results, center the conductor in the jaw.
The clamp meter LCD will display the reading.

DC Current Measurements

WARNING: Ensure that the test leads are disconnected from the meter before making current clamp measurements.

Set the Function switch to the A Range. If the approx. range of the measurement is not known, select Auto Range.
Press the /RANGE button to zero the meter display.
Use SELECT Button to select DC
Press the trigger to open jaw. Fully enclose only one conductor. For optimum results, center the conductor in the jaw.
The clamp meter LCD will display the reading.

AC Voltage Measurement

Insert the black test lead into the negative COM terminal and the red test lead into the positive V/Ω terminal.
Set the function switch to the V~ position.
Connect the test leads in parallel to the circuit under test.
Read the voltage measurement on the LCD display.

DC Voltage Measurement

Insert the black test lead into the negative COM terminal and the red test lead into the positive V/Ω terminal.
Set the function switch to the V position.
Connect the test leads in parallel to the circuit under test.
Read the voltage measurement on the LCD display.

Resistance Measurement

Insert the black test lead into the negative COM terminal and the red test lead into the positive V/Ω terminal.
Set the function switch to the position .
Use SELECT Button to select Ω
Touch the test probe tips across the circuit or component under test. It is best to disconnect one side of the device under test so the rest of the circuit will not interfere with the resistance reading.
For Resistance tests, read the resistance on the LCD display.

Capacitance Measurement

WARNING: To avoid electric shock, discharge the capacitor under test before measuring.

Insert the black test lead into the negative COM terminal and the red test lead into the positive V/Ω terminal.
Set the function switch to the position .
Use SELECT Button to select nF
Touch the test probe tips across the circuit or component under test. It is best to disconnect one side of the device under test so the rest of the circuit will not interfere with the resistance reading.
Capacitance value displayed on the LCD display.

Frequency Measurement

Insert the black test lead into the negative COM terminal and the red test lead into the positive V/Ω terminal.
Set the function switch to the Hz position.
Touch the test probe tips across the circuit or component under test. It is best to disconnect one side of the device under test so the rest of the circuit will not interfere with the resistance reading.
Frequency measurement can be read on the LCD display.

Temperature Measurement

Set the function switch to the °C/°F position.
Insert the Temperature Probe into the negative COM and the V/Ω positive jacks, observing polarity.
Touch the Temperature Probe head to the device under test. Continue to touch the part under test with the probe until the reading stabilizes.
Read the temperature on the display. The digital reading will indicate ambient temperature if no probe is inserted.
Use the SELECT button to select °F or °C.

WARNING: To avoid electric shock, be sure the thermocouple probe has been removed before changing to another measurement function.

Continuity Measurements

Insert the black test lead into the negative COM terminal and the red test lead into the positive V/Ω terminal.
Set the function switch to the position.
Use SELECT Button to select . The display icons will change when the SELECT button is pressed.
Touch the Test Probe tips across the circuit or component under test.
If the resistance is <50Ω, the buzzer tone will sound.

Diode Measurements

Insert the black test lead into the negative COM terminal and the red
test lead into the positive V/Ω terminal
Set the function switch to the position.
Use SELECT Button to select . The display icons will change when the SELECT button is pressed.
Touch the test probe tips to the diode or semiconductor junction under test. Note the meter reading
Reverse the test lead polarity by reversing the red and black leads. Note the reading
The diode or junction can be evaluated as follows:
- If one reading displays a value (typically 0.400V to 0.900V) and the other reading displays OL, the diode is good.
- If both readings display OL device is open
- If both readings are very small or “0”, the device is shorted

Non-Contact AC Voltage Measurements

WARNING: Risk of Electrocution. Before use, always test the Voltage Detector on a known live circuit to verify proper operation

Touch the probe tip to the hot (LIVE) conductor or insert into the hot (LIVE) side of the electrical outlet.
If AC voltage is present, the detector red LED light will illuminate.
- a. NOTE : The conductors in electrical cord sets are often twisted. For best results, rub the probe tip along a length of the cord to assure placing the tip in close proximity to the live conductor.
- b. NOTE : The detector is designed with high sensitivity. Static electricity or other sources of energy may randomly trip the sensor. This is normal operation.

HOLD/Flashlight & LCD Backlight

To freeze the LCD reading, press the HOLD/ button. While data hold is active, the HOLD icon appears on the LCD. Press the HOLD/ button again to return to normal operation.
The LCD is equipped with backlighting for easier viewing, especially in dimly lit areas. Press the Select Key button for 3 seconds to turn the Flashlight and LCD backlight on. Press again for 3 seconds to turn the Flashlight and backlight off. The both work simultaneously.

Range

Press the RANGE key to activate the manual mode and to disable the Autorange function. The symbol “AUTO” disappears from the upper left part of the display. In manual mode, press the RANGE key to change measuring range: the relevant decimal point will change its position. ‘ The RANGE keyis not active in positions, , , CAP, Hz%, Temp °C °F. In Auto range mode, the instrument selects the most appropriate ratio for carrying out measurement. If a reading is higher than the maximum measurable value, the indication “OL” appears on the display. Press and hold the RANGE key for more than 1 second to exit the manual mode and restore the Auto range mode.

Automatic Power OFF

In order to conserve battery life, the meter will automatically turn off after approximately 15 minutes. To turn the meter on again, turn the rotary function switch to the OFF position and then to the desired function range. To cancel the auto power off function, press SELECT button and turn on the power with the rotary switch at the same time. THE “APO” symbol will disappear from the LCD display.

Maintenance

WARNING: To avoid electrical shock, disconnect the meter from any circuit, remove the test leads from the input terminals, and turn OFF the meter before opening the case. Do not operate the meter with an open case.

Cleaning and Storage

Periodically wipe the case with a damp cloth and mild detergent; do not use abrasives or solvents. If the meter is not to be used for 60 days or more, remove the battery and store it separately

Battery Replacement