Extech Instruments MA435T-NIST 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.

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