MAJOR TECH MT785 1000 A AC/DC Trms Power Clamp Meter User Manual

: June 4, 2024
: MAJOR TECH

Table of Contents

MAJOR TECH MT785 1000 A AC/DC Trms Power Clamp Mete
References
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MAJOR TECH MT785 1000 A AC/DC Trms Power Clamp Mete

Safety

International Safety Symbols

This symbol adjacent to another symbol, terminal or operating device indicates that the operator must refer to an explanation in the Operating Instructions to avoid personal injury or damage to the meter.
This symbol adjacent to one or more terminals identiﬁes them as being associated with ranges that may, in normal use, be subjected to particularly hazardous voltages. For maximum safety, the meter and its test leads should not be handled when these terminals are energized.
Equipment is protected by double or reinforced insulation

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.

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

Cautions cont.

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 AC, A DC	1000A AC
V DC, V AC	1000V DC/AC
Resistance, Capacitance, Frequency, Diode Test	600V DC/AC
Temperature	600V DC/ AC

Description

Meter Description

Current clamp
Flash light LED
Non-contact AC voltage indicator light
Flash light button
Clamp trigger
Rotary Function switch
Data Hold and Backlight button
MODE select button
PEAK and INRUSH button
Max/Min button
RANGING button
LCD display
COM input jack
V ΩCAP TEMP Hz jack
Battery Cover

Display icons Description

HOLD Data Hold
Negative Reading Display
Measurement display digits Maximum/Minimum
REL/DCA Zero
Auto Power Off
Auto Range Mode
Direct Current / Alternating Current
Low Battery
Milli-volts or Volts (Voltage)(Resistance)
Amperes (Current)
Farad (Capacitance)
Hertz (Frequency)/Percent (duty ratio)
Celsius and Fahrenheit units (Temperature)
Unit of measure prefixes: nano, milli, micro
Continuity Test
Diode Test
THD THD Test
Individual Harmonic mode Select Mode

SPECIFICATIONS

Voltage

Function| Range| Resolution| Accuracy

(% of reading + digits)

---|---|---|---

DC Voltage

| 6.000V| 1mV| +1.0% of rdg + 3digits
60.00V| 10mV| +1.2% of rdg + 3digits
600.0V| 100mV| +1.2% of rdg + 3digits
1000V| 1V| +1.5% of rdg + 3digits

Maximum Input: 1000V DC ****

Function| Range| Resolution| Accuracy

(% of reading + digits)

---|---|---|---

AC True RMS Voltage

| 6.000V| 1mV| +1.2% of rdg + 5digits
60.00V| 10mV| +1.2% of rdg + 5digits
600.0V| 100mV| +1.5% of rdg + 5digits
1000V| 1V| +3% of rdg + 8digits

AC Response: 50 Hz to 400Hz

Not sinusoidal waveform Accuracy:(60Hz to 400Hz) : (10%rdg + 10dgt)

Maximum Input: 1000V ac rms.

Function| Range| Resolution| Accuracy

(% of reading + digits)

---|---|---|---

AC +DC

| 6.000V| 1mV| +1.5% of rdg + 5digits
60.00V| 10mV| +1.5% of rdg + 5digits
600.0V| 100mV| +1.5% of rdg + 5digits
1000V| 1V| +3% of rdg + 8digits

Current

Function| Range| Resolution| Accuracy

(% of reading + digits)

---|---|---|---

DC A

| 60A| 10mA| ±(2.5% of reading + 0.2A)
1000A| 100mA| ±(2.5% of reading + 5digits)
AC A| 60A| 10mA| 50-60Hz ±(2.5% of reading + 8digits)
1000A| 100mA

Frequency

Function	Range	Resolution	Accuracy
Frequency	20Hz-10kHz	0.1Hz	±(0.5% of reading + 3digits)

Total Harmonic Distortion

Function	Range	Resolution	Accuracy
AC A/AC V	99.9%	0.1%	±(3% of reading + 10digits)

Harmonic distortion measurement

Function	Range	Resolution	Accuracy
H01-H12	99.9%	0.1%	±(5% of reading + 10digits)
H13-H25	±(10% of reading + 10digits)

ACA Sensitivity: >10A RMS

DCV Sensitivity : >5V MAX 600V

Active Power

Function	Range	Accuracy
AC W	599.9KW	A.error x v.reading+ V.error x A.reading

Power Factor

Function	Range	Accuracy
PF	-1.0-0.0-1.0	±(3% of reading + 1digits)

Resistance & Continuity & Diode

Function	Range	Resolution	Accuracy
Resistance	600.0Ω	0.1Ω	±(1.0% of reading + 5digits)
6.000kΩ	1Ω	±(1.5% of reading + 3digits)
60.00kΩ	10Ω	±(1.5% of reading + 3digits)
600.0kΩ	100Ω	±(1.5% of reading + 3digits)
6.000MΩ	1kΩ	±(2.0% of reading + 5digits)
60.00MΩ	10kΩ	±(3% of reading + 8digits)

Capacitance

Function	Range	Resolution	Accuracy
Capacitance	9.999uF	1nF	±(3% of reading + 5digits)
99.99uF	10nF	±(3% of reading + 5digits)
999.9uF	0.1uF	±(4% of reading + 10digits)
9999uF	1uF	±(4.5% of reading + 10digits)

Temperature

Function	Range	Resolution	Accuracy
Temperature	-50°C —-

+599.9°C

| 0.1°C| ±(3% of reading + 5°C)

±(3% of reading + 5°C)

600°C —-

+1000°C

| 1°C
-58°F —-

+599.9°F

| 0.1°F| ±(3% of reading + 9°F)

±(3% of reading + 9°F)

600°F —-

+1832°F

| 1°F

Diode and Continuity

Function	Testing Condition	Reading
Diode	Forward DCA is approx.1mA, open circuit Voltage MAX . 3V	Forward

voltage drop of Diode
Continuity| Test current MAX. 1.5mA| Buzzer makes a long sound, While resistance is less than(50)

General Specifications

Clamp jaw opening 1.9″ (48mm) approx.
Flexible coil φ140*180mm
Display 3-6/7 digits (6000 counts) backlit LCD
Continuity check Threshold 50Ω; Test current <0.5mA
Low Battery indication is displayed
Over-range indication ‘OL’ display
Measurement rate 3 readings per second, nominal
PEAK Captures peaks >1ms
INRUSH 100MS
Temperature sensor Type K thermocouple
Input Impedance 10MΩ (VDC and VAC)
AC response True RMS (A AC and V AC)
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 One (1) 9V Battery
Auto power OFF After approx. 30 minutes
Dimensions & Weight 230 x 76 x 40mm; 315g
Safety For indoor use and in accordance with the requirements for double insulation to
IEC1010-1 (2001): EN61010-1 (2001)
Overvoltage Category III 1000V and
10 Category IV 600V, Pollution Degree 2

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/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 1000A, 600A or 60A range. If the approx. range of the measurement is not known, select the highest range then move to the lower ranges if necessary.
Press the ZERO button to zero the meter display.
Use the MODE button to select AC or DC Current.
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.
NOTE: Press ZERO button to test DC Current Measurements

AC Voltage Measurement

Insert the black test lead into the negative COM terminal and the red test lead into the positive V G CAP TEMP Hz 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 G CAP TEMP Hz 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

Insert the black test lead into the negative COM terminal and the red test lead into the V G CAP TEMP Hz Ω positive terminal.
Set the function switch to the Ω G ))).CAP position.
Touch the test probe tips across the circuit or component under test.
Read the resistance on the LCD display.

Capacitance Measurements

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

Set the function switch to the Ω G ))).CAP position.
Insert the black test lead banana plug into the negative COM jack and the red test lead banana plug into the V G CAP TEMP Hz Ω· positive jack.
Touch the test probe tips across the part under test. If “OL” appears in the display, remove and discharge the component.
Read the capacitance value in the display.
The display will indicate the proper decimal point and value.
Note : For very large values of capacitance measurement it can take several minutes before the final reading stabilizes.

Frequency Measurements

Insert the black test lead banana plug into the negative COM jack and the red test lead banana plug into the V G CAP TEMP Hz Ω positive jack.
Set the function switch to the AC V/AC A Position.
Touch the test probe tips across the part under test.
Read the value on the display.
The display will indicate the proper decimal point and value.

Temperature Measurements

Set the function switch to the TEMP position.
Insert the Temperature Probe into the negative COM and the V G CAP TEMP Hz 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 the proper decimal point and value.
Use the MODE button to select °C or °F.
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 V G CAP TEMP Hz Ω positive terminal.
Set the function switch to the Ω G ))).CAP position.
Use the MODE button to select continuity “ “ The display icons will change when the MODE button is pressed.
Touch the test probe tips across the circuit or component under test.
If the resistance is < 50Ω, a tone will sound.

Diode Test

Insert the black test lead banana plug into the negative COM jack and the red test lead banana plug into the V G CAP TEMP Hz Ω positive jack
Turn the function switch to Ω G ))).CAP. Use the MODE button to select the diode function if necessary (diode symbol will appear on the LCD when in Diode test mode)
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 this 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 the device is open.
If both readings are very small or ‘0’, the device is shorted.

THD Measurement (AC mode only)
Select the “THD” indicator then press the MODE key to enter the THD mode. THD-F=RMS of Harmonics ÷ RMS of fundamental ×100%. (harmonics up to the 50th)

Individual Harmonic Measurement (AC mode only)
Select the “ “ indicator then press the mode key to enter the individual harmonic mode. Select the “Hn “ indicator then press the and key to enter the individual harmonic mode. Hn=RMS of Individual Harmonic ÷ RMS of fundamental ×100%.

Measuring Active Power (W) / Power factor (PF)

Single Phase Power Measurement

Step 1: Set the rotary switch to the “W” position.
Step 2: Connect the Red test lead to the Line conductor, and the Black test lead to the Neutral conductor.
Step 3: Press the trigger to open the transformer jaws and clamp one conductor only, make sure that the jaw is firmly closed around
the conductor.
Step 4: Using the Mode key to choose the “W/PF” mode.
Note: The meter offer AC power measurement mode only.

Active power sign :
No sign : Indicates the power flows from the power source to the load.
“_” sign : Indicates the power flows from the load to the power source.
Power factor sign :
No sign : The phase of the current signal is lagging behind the voltage signal (inductive load).
“_” sign : The phase of the current signal is leading the voltage signal (capacitive load).
Overrange display :
± OL kW : Active Power >600 kW or < -600 kW.
OLU: Active Power >600 V or < -600 V.

RANGE button

The AUTORANGE mode automatically selects the proper range for the measurement being made and is generally the best mode for most applications. For measurement situations requiring that a range be manually selected, perform the following:

Momentarily press the RANGE button. The “AUTO” indicator will no longer be shown on the LCD display.
Momentarily press the RANGE button to step through the available ranges until the desired range is selected.
To exit the Manual Ranging mode, press and hold the RANGE button until the “AUTO” indicator reappears.

The Autorange mode automatically selects the proper range for the measurement being made and is generally the best mode for most
applications. For measurement situations requiring that a range be manually selected, perform the following:

Momentarily press the RANGE button. The “AUTO” indicator will no longer be shown on the LCD display.
Momentarily press the RANGE button to step through the available ranges until the desired range is selected.
To exit the Manual Ranging mode, press and hold the RANGE button until the “AUTO” indicator reappears.

Mode
Press MODE key the selection of double measured functions which are present at display is possible. In particular this key is active in V CAP Ω position to select among resistance test, diode test, continuity test and capacitance test, and in Temp position to select between °C or °F. and in current position to select between AC or DC current measurements and THD test.
To press and hold the MODE key to turn the system on, the auto power off function will be cancelled.
NOTE : Only ACV functions can do the peak value measurement.
PEAK Key is the peak value measurement key that acts with trigger.

INRUSH
NOTE : Only AC A functions can do the INRUSH value measurement.

Switch off motor and then clamp supply.
Press the INRUSH button , “—-”will appear in the display.
Start motor and then read the value on the display.

Data Hold
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.

MAX/MIN
Press MAX/IN key the maximum and minimum values are measured. This mode is activated on each measurement except for continuity test, diode test capacitance test, frequency test and duty cycle test.
This mode is disabled keeping pressed MAX/MIN key or moving the rotary switch.
Flash Light Button
Press the Flash light button to turn the flash light on. Press again to turn the flash light off.
LCD Backlight Button
The LCD is equipped with backlighting for easier viewing, especially in dimly lit areas. Press the backlight button to turn the backlight on. Press again to turn the backlight off. Note that the meter does have an auto power off feature as described below.
Bluetooth

Bluetooth Off: Bluetooth logo is not displayed on the screen
Bluetooth On: Bluetooth logo is displayed on screen
Hold down the mode button to select the bluetooth function

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 function switch to the OFF position and then to the desired function position.

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

Remove the Phillips head screw that secures the rear battery door
Open the battery compartment
Replace the 9V battery
Secure the battery compartment

Temperature Probe Replacement

NOTE: To use a K Type thermocouple probe that is terminated by a subminiature (flat blade) connector, a subminiature-to-banana plug adaptor (Part Number MT660 & MT802) is required.