Extech Instruments MA435T User manual

USERMANUAL
400Amp True RMS AC/DC Clamp Meter
Model MA435T
AdditionalUserManualTranslationsavailableatwww.extech.com

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Introduction
Congratulations on your purchase of this Extech MA435T True RMS Clamp Meter. This meter
measures AC/DC Current, AC/DC Voltage, Resistance, Capacitance, Frequency, Diode Test, Duty
Cycle and Continuity. Special features include Thermocouple Temperature and Non-Contact Voltage
detection. The double molded case is designed for heavy duty use. This meter is shipped fully tested
and calibrated and, with proper use, will provide years of reliable service.
Safety
International 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
This WARNING symbol indicates a potentially hazardous situation, which if not
avoided, could result in death or serious injury.
This CAUTION symbol indicates a potentially hazardous situation, which if not
avoided, may result damage to the product.
PER IEC1010 OVERVOLTAGE INSTALLATION CATEGORY
OVERVOLTAGE CATEGORY I
Equipment of OVERVOLTAGE CATEGORY I is equipment for connection to circuits in which
measures are taken to limit the transient overvoltages to an appropriate low level.
Note – Examples include protected electronic circuits.
OVERVOLTAGE CATEGORY II
Equipment of OVERVOLTAGE CATEGORY II is energy-consuming equipment to be supplied from
the fixed installation.
Note – Examples include household, office, and laboratory appliances.
OVERVOLTAGE CATEGORY III
Equipment of OVERVOLTAGE CATEGORY III is equipment in fixed installations.
Note – Examples include switches in the fixed installation and some equipment for industrial use with
permanent connection to the fixed installation.
OVERVOLTAGE CATEGORY IV
Equipment of OVERVOLTAGE CATEGORY IV is for use at the origin of the installation.
Note – Examples include electricity meters and primary over-current protection equipment
WARNING
CAUTION

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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
AC/DC Amps, 400A
AC/DC Volts 600V DC/AC
Resistance, Capacitance, Frequency, Diode
Test, Continuity, Temperature 250V DC/AC

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Description
Meter Description
1. NCV sensor
2. Current clamp
3. Non-contact AC voltage indicator light
4. Clamp trigger
5. Data Hold/ Back Light button
6. LCD display
7. MODE select button
8. COM input jack
9. Rotary Function switch
10. Relative button
11. Range button
12. Hz% Hold button
13. V ΩCAP TEMP Hz jack
14. Battery Cover (rear)
Display icons Description
HOLD Data Hold
AUTO Autoranging
DC Direct Current
AC Alternating Current
Low battery
REL Relative
V Volts (Voltage)
Ohms (Resistance)
A Amperes (Current)
F Farad (Capacitance)
Hz Hertz (Frequency)
% Duty Ratio
oF and oC Fahrenheit and Celsius units (Temperature)
n, m, , M, k Unit of measure prefixes: nano, milli, micro, mega, and kilo
))) Continuity test
Diode test
REL

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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.
Non-Contact Voltage Detector
WARNING: Risk of Electrocution. Before use, always test the Voltage Detector on a known live
circuit to verify proper operation.
1. Rotate the Function switch to any position.
2. Place the detector probe tip on the conductor to be tested.
3. If AC voltage is present, the NCV detector light will turn on with a
steady red light.
NOTE: The conductors in electrical cord sets are often twisted. For best
results, move the probe tip along a length of the cord to assure
placing the tip in close proximity to the live conductor.
NOTE: The detector is designed with high sensitivity. Static electricity or other sources of energy
may randomly trip the sensor. This is normal operation.
AC/DC Current Measurements
WARNING: Disconnect the test leads before making clamp measurements.
1. Rotate the Function switch to the 400A AC or the 400A
DC position
2. Press the trigger to open jaw. Fully enclose only one
conductor.
3. Read the current value in the display.
4. If the value is less than 40A, rotate the function switch
to the 40A position to improve resolution.

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AC/DC Voltage, Frequency, Duty Cycle Measurements
CAUTION: Do not measure voltages if a motor on the circuit is being switched ON or OFF. Large
voltage surges may occur that can damage the meter.
1. Rotate the function switch to the V position.
2. Press the MODE button to select AC or DC Voltage.
3. Insert the black test lead banana plug into the negative COM jack.
Insert the red test lead banana plug into the positive Vjack.
4. Touch the black test probe tip to the negative side of the circuit.
Touch the red test probe tip to the positive side of the circuit.
5. Read the voltage value in the display.
6. Press the Hz % button to display Frequency
7. Press the Hz % button to display Duty Cycle
Resistance, Diode, Continuity Measurements
Note: Remove power from the device under test before making resistance measurements
1. Set the function switch to the position.
2. Insert the black test lead banana plug into the negative COM jack.
Insert the red test lead banana plug into the positive jack.
3. Touch the black test probe tip to one side of the device.
Touch the red test probe tip to the other side of the device.
4. Read the resistance value in the display.
5. Press the MODE button to select the DIODE mode. The Diode symbol will
appear in the display.
6. Press the MODE button to select the Continuity mode. The continuity
symbol will appear in the display. If the resistance is <150 ohms the tone will
sound.

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Capacitance Measurements
WARNING: To avoid electric shock, discharge the capacitor before measuring.
1. Rotate the function switch to the CAP capacitance position.
2. Insert the black test lead banana plug into the negative COM jack.
Insert the red test lead banana plug into the positive CAP jack.
3. Touch the black test probe tip to one side of the device.
Touch the red test probe tip to the other side of the device.
4. Read the capacitance value in the display.
Type K Temperature Measurements
1. Rotate the function switch to the °F or °C temperature position.
2. Insert the Temperature Probe into the input jacks.
3. Press the MODE button to select °F or °C.
4. Place the temperature probe tip(s) where needed.
5. Read the temperature on the display.
Note: In case of an open input or a temperature overrange, the meter will display
“OL”.

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Data Hold
To freeze the LCD reading, press the HOLD button. The HOLD icon appears on the LCD. Press the
HOLD button again to return to normal operation.
Relative
Press the REL button (REL will appear in the display) to zero the reading and create a reference
point. All future reading will be the difference between the actual reading and the stored “REL”
reading. In the REL mode, autoranging is disabled and measurements are limited to the range
active when the REL button was pressed. Press the REL button to exit the mode.
Note: Relative does not function in Frequency or Duty Cycle mode.
Range
When the meter is first turned on, it automatically goes into Auto-Ranging. This automatically
selects the best range for the measurements being made and is generally the best mode for most
measurements. For measurement situations requiring that a range be manually selected, perform
the following:
1. Press the RANGE button and the “AUTO” icon will turn of.
2. Press the RANGE button to step through the available ranges until the range needed appears.
3. Press and hold the RANGE button for 2 seconds to exit the Manual-Ranging mode and return
to Auto-Ranging.
Hz%
Press the HZ% button while in the Voltage mode to display either Frequency or Duty Cycle.
Backlight
Press and hold the HOLD/ button for two seconds to turn the backlight on. Repeat the button
press to turn the backlight off.
CAUTION: The HOLD function will enable when the backlight is turned on. Press and release the
HOLD button to turn HOLD off.
Automatic Power Off
In order to conserve battery life, the meter will automatically turn off after approximately 30 minutes.
To turn the meter on again, change the position of the function switch.
Low battery indication
When the icon appears in the display, the battery should be replaced. Refer to the battery
replacement procedure in the maintenance section.

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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
1. Remove the Phillips head screw that secures the rear battery cover
2. Open the battery compartment
3. Replace the 9V battery.
4. Secure the battery compartment door
Never dispose of used batteries or rechargeable batteries in household waste.
As consumers, users are legally required to take used batteries to appropriate
collection sites, the retail store where the batteries were purchased, or wherever
batteries are sold.
Disposal: Do not dispose of this instrument in household waste. The user is obligated
to take end-of-life devices to a designated collection point for the disposal of electrical
and electronic equipment.
Other Battery Safety Reminders
oNever dispose of batteries in a fire. Batteries may explode or leak.
oNever mix battery types. Always install new batteries of the same type.

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Specifications
Function Range Resolution Accuracy
(% of reading + digits)
AC Current*
50/60Hz TRMS 40.00 A 0.01A ±(2.8% + 8 digits)
400.0 A 0.1A
DC Current 40.00 A 0.01A ±(2.5% + 5 digits)
400.0 A 0.1A ±(2.8% + 5 digits)
AC Voltage*
50/60Hz TRMS 400.0mV 0.1mV ±(1.5% + 30 digits)
4.000 V 0.001V
±(1.5% + 8 digits)
40.00 V 0.01V
400.0 V 0.1V
600 V 1V ±(2.5% + 5 digits)
DC Voltage 400.0 mV 0.1mV ±(0.8% + 2 digits)
4.000 V 0.001V
±(1.5% + 2 digits)
40.00 V 0.01V
400.0 V 0.1V
600 V 1V ±(2.0% + 2 digits)
Resistance 400.00.1±(1.0% + 4 digits)
4.000k0.001k
±(1.5% + 2 digits)
40.00k0.01k
400.0k0.1k
4.000M0.001M±(2.5% + 3 digits)
40.00M0.01M±(3.5% + 5 digits)
Capacitance 40.00nF 0.01nF ±(4.0% + 20 digits)
400.0nF 0.1nF
±(3.0% + 5 digits)
4.000µF 0.001µF
40.00µF 0.01µF
100.0µF 0.1µF ±(4.0% + 10 digits)
Frequency 10 to 10kHz 0.01Hz ±(1.5% + 2 digits)
Sensitivity: 100V(<50Hz); 50V(50 to 400Hz); 15V(401Hz to 10kHz)
Duty Cycle 0.5% to 99.0% 0.1% ±(1.2% + 2 digits)
Pulse width: 100s to 100ms, Frequency: 10Hz to 10kHz
Temperature
Type K -4.0 to 1400°F -20 to 760°C
0.1° <400°
1° >400° ±(3% + 9°F/5°C)
Specification does not include probe accuracy. Range of supplied probe is -22
to 572°F (-30 to 300°C).
* AC Current and AC Voltage accuracy data are specified from 5% to 100% of published ranges.