Major MT 730 User manual

MT 730
AC CLAMP METER
INSTRUCTION MANUAL
© 2004, MAJOR TECH (PTY) LTD. All rights reserved

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. Diode Test ........................................ 11
11. Continuity Testing ........................... 12
12. Data Hold Function ........................ 13
13. Max Hold Function ......................... 13
14. LCD Backlight ................................. 13
15. Battery Replacement ..................... 14
16. Optional Accessories ..................... 14
1. MEASURING LIMITS
AC Amperes : 0.01A to 600A
DC Voltage : 0.1mV to 600V
AC Voltage : 0.1mV to 600V
Resistance : 0.1Ω to 20MΩ
Buzzer : Sounds >120Ω
Diode Test : Test Current <0.3mA
1
CONTENTS

2
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 MT730 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.
3
!!
!

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
! Large 2000 count LCD display with bright
white LED backlight.
! Wide measuring range from 0.01A AC up to
600A AC
! Measures AC and DC Voltage up to 600 volts
! Measures resistance from 0.01Ω up to 20MΩ.
! Designed to the international safety standard
IEC61010 CAT lll 600V / CAT ll 1000V,
Pollution degree 2.
! Max Hold records the highest reading in the
current and voltage ranges.
! Auto Power Off after approximately 15
minutes to conserve battery life.
! Continuity Buzzer <120Ω
! Diode Test current 0.3mA typical.
! Low battery indication.
! 30mm Maximum conductor size.
! Data Hold switch used to freeze reading on
display.
4
!!

4. INSTRUMENT LAYOUT
Transformer
Jaws
Jaw
Trigger
Backlight
Switch
Max Hold
Switch
Display
COM
Terminal
AC Volt, DC Volt
Resistance,
Buzzer and
Diode Test Input
Terminal
Data Hold
Switch
Range
Selector
Switch for
Volts and
Resistanc
5
Buzzer and
Diode Test
Switch

5. SPECIFICATIONS
Range
AC Current
Measuring Range Resolution
40A
400A
600A
0 ~ 40.00A
0 ~ 400.0A
0 ~ 600A
0.01 A
0.1 A
1 A
Accuracy (% of Reading)
± (2.5% + 10 digits)
± (2.5% + 10 digits)
± (3.0% + 8 digits)
Range
DC Voltage
Measuring Range Resolution
200mV
2V
20V
200V
600V
0 ~ 200.0mV
0 ~ 2.000V
0 ~ 20.00V
0 ~ 200.0V
0 ~ 600V
0.1 mV
0.001 V
0.01 V
0.1 V
1 V
Accuracy (% of Reading)
± (0.8% + 5 digits)
± (1.2% + 3 digits)
± (1.5% + 3 digits)
Range
AC Voltage
Measuring Range Resolution
200mV
2V
20V
200V
600V
0 ~ 200.0mV
0 ~ 2.000V
0 ~ 20.00V
0 ~ 200.0V
0 ~ 600V
0.1 mV
0.001 V
0.01 V
0.1 V
1 V
Accuracy (% of Reading)
± (1.5% + 30 digits)
± (1.5% + 3 digits)
± (2.0% + 4 digits)
Range
Resistance
Measuring Range Resolution
200Ω
2kΩ
20kΩ
200kΩ
2MΩ
20MΩ
0 ~ 200.0Ω
0 ~ 2.000kΩ
0 ~ 20.00kΩ
0 ~ 200.0kΩ
0 ~ 2.000MΩ
0 ~ 20.00MΩ
0.1 Ω
1Ω
10 Ω
100 Ω
1 kΩ
10 kΩ
Accuracy (% of Reading)
± (1.0% + 4 digits)
± (1.5% + 2 digits)
± (2.0% + 3 digits)
± (3.0% + 5 digits)
Note: No Autoranging on 200mV AC Range
6
Clamp Size
Diode Test
Continuity Check
Low Battery Indication
Overrange Indication
Measurements Rate
Input Impedance
Display
AC Current Bandwidth
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 <120Ω; Test current <1mA
“BAT “ is displayed
“OL” is displayed
2 per second, nominal
7.8MΩ (VDC and VAC)
2000 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
Two 1.5V “AAA” Batteries
Approx 15 minutes
229 x 80 x 49mm
303g

6. 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.
20A
~
200A
~
600A
~
Correct Current
Measurement
Incorrect Current
Measurement
7
!!

+
-
7. 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 ”
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 maximum
reading on the DC volt range. See page
13 for further instructions for “MAX” Hold
function.
Battery
8
V
__
__ __ __
MAX

AC Supply
8. AC VOLTAGE MEASUREMENT
1. Set the function switch to range
position.
2. Insert the red test lead into the “V Ω ”
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 hold button will
allow the user to record the maximum
reading on the AC volt range. See page
13 for further instructions for “MAX” Hold
function.
V
~
9
MAX

!!
9. RESISTANCE MEASUREMENT
1. Set the function switch to range
position.
2. Insert the red test lead into the “V Ω ”
input terminal and the black lead to the “COM”
terminal.
3. Connect the other end of the test leads to the
circuit or component under test. Take the
reading on the display.
Note: • The meter is set to default to “Auto
Range” mode.
• WARNING before attempting to
make a resistance measurement, ensure
there is no voltage present on the circuit
under test.
Ù
Resistor
10

10. DIODE TEST
1. Set the function switch to range position.
2. Press the button to select the Diode Test
range. The meter automatically defaults to
Diode Test range.
3. Insert the red test lead into the “V Ω ”
input terminal and the black lead to the “COM”
terminal.
4. Connect the other end of the test leads to the
component under test. Read the display.
Note:• Use the diode test to check diodes,
Transistors, silicon controlled rectifiers
(SCR’s) and other semiconductor devices.
• The test sends a current through a
semiconductor junction, then measures
the junction’s voltage drop.
• Normal forward voltage drop (forward bias)
for a good silicon diode is between 0.4V to
0.9V. A reading higher than that indicates
a leaky (defective) diode. A zero reading
indicates a shorted diode.
• Reverse the test leads connection (reverse
bias) across the diode. The display shows
“OL” if the diode is good. Any other
readings indicate the diode is shorted or
resistive (defective).
Diode
11

11. CONTINUITY TESTING
1. Set the function switch to range position.
2. Press the button to select the Continuity
Test range. The meter automatically defaults to
Diode Test.
3. Insert the red test lead into the “V Ω ”
input terminal and the black lead to the “COM”
terminal.
4. Short the tip of the test leads and make sure the
display reads “0” and the buzzer beeps.
5. Connect the tip of the test leads to the circuit or
component under test. The display reads the
resistance and the buzzer beeps when the
reading is not more than about 120Ω.
Note: • Using resistance and continuity function
in a live circuit will produce false results
and may damage the instrument.
• In many cases the suspicious
components must be disconnected from
the circuit under test to obtain accurate
results
• WARNING before attempting to
make a test, ensure there is no voltage
present on the circuit. .
Buzzer Sounds
!!
12

12. 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.
13. MAX HOLD
This is a function used to record the maximum
reading on the display for the voltage and current
ranges.
1. Press the button once. When the MAX
is activated, the meter beeps, and displays the
“MAX” indicator on the LCD.
2. The meter will record the highest reading and
freeze the display indicating this maximum
reading.
3. To deactivate the “MAX” function, press
button once, the meter will beep and the meter
will start reading new measurements.
14. 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 together with the
Data Hold.
2. To turn off the backlight press the button
for 3 seconds.
Note: • The use of the backlight will reduce the
battery life considerably.
HOLD
HOLD
MAX
MAX
13

15. BATTERY REPLACEMENT
When the “ BAT “ sign appears on the LCD, this
indicates the battery should be replaced. Use the
following procedure to replace the two standard
“AAA” 1.5V batteries (IEC LR 3) batteries.
1. Disconnect the test leads from any live source
and remove the leads from the input terminals.
2. Rotate the function switch to the
position.
3. The battery cover is secured to the bottom of
the case by a screw. Using a screwdriver
remove the screw from the battery cover and
remove the battery cover from the meter.
4. Remove the old battery and replace it with two
new IEC LR 3 1.5V batteries.
5. Replace the battery cover and reinstall the
screw.
16. OPTIONAL ACCESSORIES
OFF
HDT 3914
Crocodile Clip
CAT lll 600V, CAT ll 1000V
10A Ratings
HDT 1282
ComfiGrip™ Test Leads
CAT lV 600V, CAT lll 1000V
10A Rating
Battery Cover
14

© 2004, MAJOR TECH (PTY) LTD.
All rights reserved E&OE
MAJOR TECH
(PTY) LTD
T9 Industrial Village, Sam Green Road,
Tunney Ext. 9, Elandsfontein,
South Africa
P.O. Box 888, Isando 1600,
South Africa
Telephone: [phone]
National Contact Number: 08 61 62 5678
Sales Facsimile: [phone]
Admin Facsimile: [phone]
E-mail: [email protected]
www.major-tech.com