MAJOR TECH MTD73A 800A AC True RMS Digital Clamp Meter Instruction Manual

INSTRUCTION MANUAL
MTD73A
800A AC TRUE RMS
DIGITAL CLAMP METER

SAFETY

1.1. 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.
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.
• Remove the battery if meter is to be stored for longer than 60 days.

1.3. 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.

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 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.

Description

2.1. Meter Description

1. NCV Test
2. Current clamp
3. LED Flashlight
4. Non-contact AC voltage indicator light
5. Clamp trigger
6. Rotary Function switch
7.  SELECTOR mode range button/Flashlight
8. Data Hold button
9. REL button for Relative Measurement
10. Flashlight and LCD backlight button
11. LCD display
12. COM input jack
13. V Ω Diode Continuity CAP TEMP Hz% jack
14. Battery Cover

2.2. Display Icons

General Specifications

Basic Functions Range

Clamp jaw opening| 28mm approx.
Display| 4000 Count (3-3/4 digits backlit LCD
Low Battery indication| La is displayed
Over-range indication| ‘012 display
Measurement rate| 3 readings per second, nominal
Temperature sensor| Type K thermocouple 4mm terminals
Input Impedance| 10MQ (VDC and VAC)
AC response| Average Reading (MC 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| 2000m (7000ft.) maximum.
Battery| 2 x 1.5V AM Battery
Battery life| Approx. 30h (backlight ON), Approx. 100h (backlight OFF)
Auto power OFF| After approx. 15 minutes
Dimensions| 123 x 270 x 39mm
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 Over voltage Category III 600V, Pollution Degree 2.

Specifications

4.1. AC Current

40A: ±(2% rdg + 5 digits)
40A| 10mA
400A| 100mA
800A| 1A

Over range protection: Maximum input 1000A. Accuracy specified from 5% to 100% of the measuring range. Frequency Response: 40Hz to 1kHz True RMS
4.2. AC Voltage (Auto Ranging)

Input impedance 10MΩ. Overload protection 1000V DC or 750V AC peak value. Frequency response 600V at 40Hz to 1kHz (sine), other ranges 50/60Hz (all wave).
4.3. DC Voltage (Auto Ranging)

Input impedance on 400mV range >40MΩ all other ranges 10MΩ.
Overload protection 1000V DC or 750V AC peak value
4.4. Resistance (Auto Ranging)

Input Protection: 250V DC or 250V AC RMS
Note: a. On 400Ω 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.
Warning DO NOT apply voltage to this range
4.5. Capacitance (Auto Ranging)

Input Protection: 250V DC or 250V AC RMS
Ensure capacitors are discharged before measuring value
Warning DO NOT apply voltage to this range
4.6. Frequency (Auto Ranging)

Input Protection: 250V DC or 250V AC RMS
Input sensitivity >0.7V
Warning DO NOT apply voltage to this range
4.7. Temperature

-40°C to
+1000°C| 1°C| < 400°C: +1.0% of rdg ±5°C
≥ 400°C: +1.5% of rdg ±5°C

Input Protection: 250V DC or 250V AC RMS
Sensor: Type K Banana Plug Thermocouple
Warning DO NOT apply voltage to this range
4.8. Diode & Continuity

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

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

5.2. AC Voltage Measurement

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

5.3. DC Voltage Measurement

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

5.4. Resistance Measurement

1. Insert the black test lead into the negative COM terminal and the red test lead into the positive V/Ω terminal.
2. Set the function switch to the position .
3. Use SELECT Button to select Ω.
4. 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.
5. For Resistance tests, read the resistance on the LCD display.

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

1. Insert the black test lead into the negative COM terminal and the red test lead into the positive V/Ω terminal.
2. Set the function switch to the position.
3. Use SELECT Button to select nF.
4. 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.
5. Capacitance value displayed on the LCD display.

5.6. Frequency Measurement

1. Insert the black test lead into the negative COM terminal and the red test lead into the positive V/Ω terminal.
2. Set the function switch to the Hz position.
3. 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.
4. Frequency measurement can be read on the LCD display.

5.7. Temperature Measurement

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

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

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

5.9. Diode Measurements

1. Insert the black test lead into the negative COM terminal and the red test lead into the positive V/Ω terminal.
2. Set the function switch to the position.
3. Use SELECT Button to select . The display icons will change when the SELECT button is pressed.
4. Touch the test probe tips to the diode or semiconductor junction under test. Note the meter reading.
5. Reverse the test lead polarity by reversing the red and black leads. Note the reading.
6. 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.

5.10. 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

1. Touch the probe tip to the hot (LIVE) conductor or insert into the hot (LIVE) side of the electrical outlet.
2. 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.

5.11. Data HOLD/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.
2. The LCD is equipped with backlighting for easier viewing, especially in dimly lit areas. Press the button for 2 seconds to turn the LCD backlight on and off.
5.12. Flashlight
Hold down the SELECT Key for 2 seconds to turn on and off the flashlight.
5.13. REL Mode
This sets the relative point to measure against the next reading.
Press the REL key to enter the Relative Measurement Mode, this function resets the display to zero.
5.14. 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.

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.
6.1. 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.
6.2. Battery Replacement

1. When the LCD displays , please replace the battery to ensure correct readings.
2. Remove the Phillips head screw that secures the rear battery door.
3. Open the battery compartment.
4. Replace the 2x 1.5V AAA battery, recommend Alkaline batteries for longer use.
5. Secure the battery compartment.

MAJOR TECH (PTY) LTD
South Africa
www.major-tech.com
sales@major-tech.com
Australia
www.majortech.com.au
info@majortech.com.au

References

• Major Tech - Innovation l Quality l Excellence
• Home - Major Tech Australia

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