Extech Instruments EX430A 11 Function True RMS Professional MultiMeter User's Manual

Extech Instruments EX430A is a True RMS Autoranging Multimeter capable of measuring AC/DC Voltage, AC/DC Current, Resistance, Capacitance, Frequency, Duty Cycle, Diode Test, and Continuity plus Thermocouple Temperature. It also features a backlit display, auto power off, and a protective holster. With its versatile range of functions and features, the Extech EX430A is an ideal tool for electrical and electronic professionals, technicians, and hobbyists.

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True RMS Multimeter

Extech EX430A

USER MANUAL

Introduction

Congratulations on your purchase of the Extech EX430A True RMS Autoranging Multimeter. This meter measures AC/DC Voltage, AC/DC Current, Resistance, Capacitance, Frequency, Duty Cycle,

Diode Test, and Continuity plus Thermocouple Temperature. Proper use and care of this meter will provide many years of reliable service. For copies of this user manual in other languages please visit the www.extech.com

website.

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

WARNING

This WARNING symbol indicates a potentially hazardous situation, which if not avoided, could result in death or serious injury.

CAUTION

MAX

600V

This CAUTION symbol indicates a potentially hazardous situation, which if not avoided, may result damage to the product.

This symbol advises the user that the terminal(s) so marked must not be connected to a circuit point at which the voltage with respect to earth ground exceeds (in this case) 600 VAC or VDC.

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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.

 This device is not a toy and must not reach children’s hands. It contains hazardous objects as well as small parts that children could swallow. In case a child swallows any of the parts, please contact a physician immediately

 Do not leave batteries and packing material unattended; they can be dangerous for children.

 In case the device is going to be unused for an extended period of time, remove the batteries to prevent them from draining.

 Expired or damaged batteries can cause cauterization on contact with skin. Always use suitable hand protection.

 See that the batteries are not short-circuited. Do not put batteries into fire.

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OVERVOLTAGE CATEGORY III

This meter meets the IEC 61010-1 (EN 61010-1), 2010, 3 rd edition standard for OVERVOLTAGE

CATEGORY III. Cat III meters are protected against overvoltage transients in fixed installation at the distribution level. Examples include switches in the fixed installation and some equipment for industrial use with permanent connection to the fixed installation.

SAFETY INSTRUCTIONS

This meter has been designed for safe use, but must be operated with caution. The rules listed below must be carefully followed for safe operation.

1. NEVER apply voltage or current to the meter that exceeds the specified maximum:

Input Protection Limits

V DC or V AC mA AC/DC

A AC/DC

Frequency, Resistance, Capacitance,

Duty Cycle, Diode Test, Continuity

600V DC and AC, 200Vrms on 400mV range

500mA 600V fast acting fuse

10A 600V fast acting fuse (30 seconds max every 15 minutes)

250Vrms for 15sec max

2. USE EXTREME CAUTION when working with high voltages.

3. DO NOT measure voltage if the voltage on the "COM" input jack exceeds 600V above earth ground.

4. NEVER connect the meter leads across a voltage source while the function switch is in the current, resistance, or diode mode. Doing so can damage the meter.

5. ALWAYS discharge filter capacitors in power supplies and disconnect the power when making resistance or diode tests.

6. ALWAYS turn off the power and disconnect the test leads before opening the covers to replace the fuse or battery.

7. NEVER operate the meter unless the back cover and the battery and fuse covers are in place and fastened securely.

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Description

1. 4000 count LCD display

2. HOLD

5. mA, uA and A input jacks

6. COM input jack

8. RANGE hold button

10. Backlight button

11. Protective holster

Note: Tilt stand and battery compartment are on rear of unit.

Symbols and Annunciators

•))) Continuity

Diode test

Battery status

Test lead connection error n nano 

4 m milli A



Amps

Farads (capacitance)

Ohms

Hz Hertz V Volts

% Percent (duty ratio) REL Relative

ºF

Direct current

Degrees Fahrenheit

HOLD Display hold

ºC Degrees Centigrade

5 6 7

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Operating Instructions

WARNING: Risk of electrocution. High-voltage circuits, both AC and DC, are very dangerous and should be measured with great care.

1. ALWAYS turn the function switch to the OFF position when the meter is not in use.

2. If “OL” appears in the display during a measurement, the value exceeds the range you have selected. Change to a higher range.

NOTE: On some low AC and DC voltage ranges, with the test leads not connected to a device, the display may show a random, changing reading. This is normal and is caused by the high-input sensitivity. The reading will stabilize and give a proper measurement when connected to a circuit.

DC VOLTAGE MEASUREMENTS

CAUTION: Do not measure DC voltages if a motor on the circuit is being switched ON or OFF.

Large voltage surges may occur that can damage the meter.

1. Set the function switch to the green V position.

2. Press the SELECT button to indicate “DC” on the display.

3. Insert the black test lead banana plug into the negative COM jack.

Insert the red test lead banana plug into the positive V jack.

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 in the display.

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AC VOLTAGE MEASUREMENTS

WARNING: Risk of Electrocution. The probe tips may not be long enough to contact the live parts inside some 240V outlets for appliances because the contacts are recessed deep in the outlets. As a result, the reading may show 0 volts when the outlet actually has voltage on it. Make sure the probe tips are touching the metal contacts inside the outlet before assuming that no voltage is present.

CAUTION: Do not measure AC voltages if a motor on the circuit is being switched ON or OFF.

Large voltage surges may occur that can damage the meter.

1. Set the function switch to the green V position.

2. Press the SELECT button to indicate “AC” on the display.

3. Insert the black test lead banana plug into the negative COM jack.

Insert red test lead banana plug into the positive V jack.

4. Touch the black test probe tip to the neutral side of the circuit.

Touch the red test probe tip to the “hot” side of the circuit.

5. Read the voltage in the display.

DC CURRENT MEASUREMENTS

CAUTION: Do not make current measurements on the 10A scale for longer than 30 seconds.

Exceeding 30 seconds may cause damage to the meter and/or the test leads.

1. Insert the black test lead banana plug into the negative COM jack.

2. For current measurements up to 4000µA DC, set the function switch to the yellow µA position and insert the red test lead banana plug into the

µA/mA jack

3. For current measurements up to 400mA DC, set the function switch to the yellow mA position and insert the red test lead banana plug into the

µA/mA jack.

4. For current measurements up to 10A DC, set the function switch to the yellow 10A range and insert the red test lead banana plug into the 10A jack.

5. Press the SELECT button to indicate “DC” on the display.

6. Remove power from the circuit under test, then open up the circuit at the point where you wish to measure current.

7. 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.

8. Apply power to the circuit.

9. Read the current in the display.

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AC CURRENT MEASUREMENTS

CAUTION: Do not make current measurements on the 10A scale for longer than 30 seconds.

Exceeding 30 seconds may cause damage to the meter and/or the test leads.

1. Insert the black test lead banana plug into the negative COM jack.

2. For current measurements up to 4000µA AC, set the function switch to the yellow µA position and insert the red test lead banana plug into the

µA/mA jack

3. For current measurements up to 400mA AC, set the function switch to the yellow mA position and insert the red test lead banana plug into the

µA/mA jack.

4. For current measurements up to 10A AC, set the function switch to the yellow 10A range and insert the red test lead banana plug into the 10A jack.

5. Press the SELECT button to indicate “AC” on the display.

6. Remove power from the circuit under test, then open up the circuit at the point where you wish to measure current.

7. 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.

8. Apply power to the circuit.

9. Read the current in the display.

RESISTANCE MEASUREMENTS

WARNING: To avoid electric shock, disconnect power to the unit under test and discharge all capacitors before taking any resistance measurements. Remove the batteries and unplug the line cords.

1. Set the function switch to the green  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. Press the SELECT button to indicate on the display.

4. Touch the test probe tips across the circuit or part under test. It is best to disconnect one side of the part under test so the rest of the circuit will not interfere with the resistance reading.

5. Read the resistance in the display.

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CONTINUITY CHECK

WARNING: To avoid electric shock, never measure continuity on circuits or wires that have voltage on them.

1. Set the function switch to the green position.

2. Insert the black lead banana plug into the negative COM jack.

Insert the red test lead banana plug into the positive  jack.

3. Press the SELECT button to indicate on the display.

4. Touch the test probe tips to the circuit or wire you wish to check.

5. If the resistance is less than approximately 150 , the audible signal will sound. If the circuit is open, the display will indicate “OL”.

DIODE TEST

1. Set the function switch to the green position.

2. Insert the black test lead banana plug into the negative COM jack and the red test lead banana plug into the positive diode jack.

3. Press the SELECT button to indicate on the display.

4. Touch the test probes to the diode under test. Forward voltage will typically indicate 0.400 to 0.700V. Reverse voltage will indicate

“OL”. Shorted devices will indicate near 0V and an open device will indicate “OL” in both polarities.

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CAPACITANCE MEASUREMENTS

WARNING: To avoid electric shock, disconnect power to the unit under test and discharge all capacitors before taking any capacitance measurements. Remove the batteries and unplug the line cords.

1. Set the rotary function switch to the green 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 test leads to the capacitor to be tested.

4. Read the capacitance value in the display

FREQUENCY MEASUREMENTS

1. Set the rotary function switch to the green “Hz” position.

2. Insert the black lead banana plug into the negative COM jack and the red test lead banana plug into the positive Hz jack.

3. Touch the test probe tips to the circuit under test.

4. Read the frequency on the display.

% DUTY CYCLE

1. Set the rotary function switch to the “Hz” position.

2. Insert the black lead banana plug into the negative COM jack and the red test lead banana plug into the positive Hz jack.

3. Press the SELECT key momentarily to select % in the display.

4. Touch the test probe tips to the circuit under test.

5. Read the % duty cycle on the display.

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CONTACT TEMPERATURE MEASUREMENTS

1. Set the function switch to the black Type K ºC or ºF position.

2. Insert the Temperature Probe into the input jacks, making sure to observe the correct polarity.

3. Touch the Temperature Probe head to the part whose temperature you wish to measure. Keep the probe touching the part under test until the reading stabilizes (about 30 seconds).

4. Read the temperature in the display.

Note: The temperature probe is fitted with a type K mini connector. A mini connector to banana connector adaptor is supplied for connection to the input banana jacks.

AUTORANGING/MANUAL RANGE SELECTION

When the meter is first turned on, it automatically goes into AutoRanging. 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 key. The AUTO display indicator will turn off.

2. Press the RANGE key to step through the available ranges until you select the range you want.

3. To exit the Manual Ranging mode and return to AutoRanging, press and hold the RANGE key for

2 seconds.

Note: Manual ranging does not apply for the Capacitance, Frequency and Temperature functions.

RELATIVE MODE

The relative measurement feature allows you to make measurements relative to a stored reference value. A reference voltage, current, etc. can be stored and measurements made in comparison to that value. The displayed value is the difference between the reference value and the measured value.

1. Perform the measurement as described in the operating instructions.

2. Press the REL button to store the reading in the display and the "REL" indicator will appear on the display.

3. The display will now indicate the difference between the stored value and the measured value.

4. Press the REL button to exit the relative mode.

Note: The Relative function does not operate in the Frequency function.

DISPLAY BACKLIGHT

Press the key for to turn on or off the display backlight function.

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HOLD

The hold function freezes the reading in the display. Press the HOLD key momentarily to activate or to exit the hold function.

AUTO POWER OFF

The auto off feature will turn the meter off after 15 minutes.

LOW BATTERY INDICATION

The icon will appear in the lower left conner of the display when the battery voltage becomes low. Replace the battery when this appears.

WRONG CONNECTION INDICATION

The icon will appear in the upper right conner of the display and the buzzer will sound whenever the positive test lead is inserted into the 10A or uA/mA input jack and a non-current

(green, black or red) function is selected. If this occurs, turn the meter off and reinsert the test lead into the proper input jack for the function selected.

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Specifications

Function Range Resolution

DC Voltage 400mV 0.1mV

4V 0.001V

40V 0.01V

400V 0.1V

AC Voltage

600V 1V

400mV 0.1mV

Accuracy

(0.3% reading + 2 digits)

(0.5% reading + 2 digits)

(0.8% reading + 3 digits)

50 to 400Hz 400Hz to 1kHz

(1.5% reading + 15 digits)

(2.5% reading + 15digits)

4V 0.001V

40V 0.01V

400V 0.1V

600V 1V

(1.5% reading + 6 digits)

(2.5% reading + 8 digits)

(1.8% reading + 6 digits)

(3% reading + 8 digits)

DC Current 400 A 0.1A

4000 A 1A

40mA 0.01mA

400mA 0.1mA

(1.5% reading + 3 digits)

AC Current

4A 0.001A

10A 0.01A

400 A 0.1A

4000 A 1A

(2.5% reading + 5 digits)

50 to 400Hz 400Hz to 1KHz

(1.8% reading + 8 digits)

(3.0% reading + 7 digits)

40mA 0.01mA

400mA 0.1mA

Resistance

4A 0.001A (3.0% reading + 8

10A 0.01A digits)

400  0.1

(3.5% reading + 10 digits)

(0.8% reading + 4 digits)

4k  0.001k (0.8% reading + 2 digits)

40k  0.01k

400k  0.1k

4M  0.001M

(1.0% reading + 2 digits)

40M  0.01M

Capacitance 40nF 0.01nF

400nF 0.1nF

(3.0% reading + 5 digits)

(5.0% reading + 7 digits)

(3.0% reading + 5 digits)

4 F 0.001F

40 F 0.01F

100 F 0.1F

(3.5% reading + 5 digits)

(5.0% reading + 5 digits)

NOTE: Accuracy is stated at 18 o C to 28 o C (65 o F to 83 o F) and less than 75% RH.

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Function Range Resolution

Frequency 5.000Hz 0.001Hz

50.00Hz 0.01Hz

Duty Cycle

Temp

(type-K)

500.0Hz 0.1Hz

5.000kHz 0.001kHz

50.00kHz 0.01kHz

500.0kHz 0.1kHz

Accuracy

(1.5% reading + 5 digits)

(1.2% reading + 2 digits)

5.000MHz 0.001MHz

10.00MHz 0.01MHz

Sensitivity: 0.8V rms min. @ 20% to 80% duty cycle and <100kHz; 5Vrms min @ 20% to 80% duty cycle and > 100kHz.

0.1 to 99.9% 0.1%

(1.5% reading + 4 digits)

(1.2% reading + 2 digits)

Pulse width: 100µs - 100ms, Frequency: 5Hz to 150kHz

-20 to 750 C 1 C

-4 to 1382 F 1F

(3.0% reading + 3 digits)

(probe accuracy not included)

NOTE: Accuracy specifications consist of two elements:

 (% reading) – This is the accuracy of the measurement circuit.

 (+ digits) – This is the accuracy of the analog to digital converter.

Diode Test

Continuity Check

Test current of 0.3mA maximum, open circuit voltage 1.5V DC typical

Audible signal will sound if the resistance is less than 150  (approx.), test current <0.7mA

Temperature Sensor Requires Type-K thermocouple

Input Impedance >7.5MΩ (VDC & VAC)

AC Response True rms

ACV Bandwidth

Display

Over-range indication

Auto Power Off

Polarity

Measurement Rate

50Hz to 1kHz

4000 count backlit LCD

“OL” is displayed

15 minutes (approximately)

Automatic (no indication for positive); Minus (-) sign for negative

2 times per second, nominal

Low Battery Indication

Battery

“ ” is displayed if battery voltage drops below operating voltage

One 9 volt (NEDA 1604) battery

Fuses mA, µA ranges; 500mA/600V ceramic fast blow

A range; 10A/600V ceramic fast blow

Operating Temperature

Storage Temperature -20

Operating Humidity

5ºC to 40ºC (41ºF to 104ºF) o C to 60 o C (-4 o F to 140 o F)

Max 80% up to 31ºC (87ºF) decreasing linearly to 50% at 40ºC(104ºF)

Storage Humidity

Operating Altitude

Weight

Size

Safety

<80%

2000 meters (7000ft) maximum.

342g (0.753lb) (includes holster).

187 x 81 x 50mm (7.36” x 3.2” x 2.0”) (includes holster)

For indoor use and in accordance with the requirements for double insulation to IEC 61010-1 (EN 61010-1), 2010, 3 rd edition for

Overvoltage Category III 600V, Pollution Degree 2.

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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.

This MultiMeter is designed to provide years of dependable service, if the following care instructions are performed:

1. KEEP THE METER DRY. If it gets wet, wipe it off.

2. USE AND STORE THE METER IN NORMAL TEMPERATURES. Temperature extremes can shorten the life of the electronic parts and distort or melt plastic parts.

3. HANDLE THE METER GENTLY AND CAREFULLY. Dropping it can damage the electronic parts or the case.

4. KEEP THE METER CLEAN. Wipe the case occasionally with a damp cloth. DO NOT use chemicals, cleaning solvents, or detergents.

5. USE ONLY FRESH BATTERIES OF THE RECOMMENDED SIZE AND TYPE. Remove old or weak batteries so they do not leak and damage the unit.

6. IF THE METER IS TO BE STORED FOR A LONG PERIOD OF TIME, the batteries should be removed to prevent damage to the unit.

Battery Replacement

1. Remove the Phillips head screw that secures the rear battery door

Open the battery compartment

Replace the 9V battery

4. Secure the battery compartment

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-oflife devices to a designated collection point for the disposal of electrical and electronic equipment.

Other Battery Safety Reminders o Never dispose of batteries in a fire. Batteries may explode or leak. o Never mix battery types. Always install new batteries of the same type.

WARNING: To avoid electric shock, do not operate the meter until the battery cover is in place and fastened securely.

NOTE: If your meter does not work properly, check the fuses and batteries to make sure that they are still good and that they are properly inserted.

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REPLACING THE FUSES

1. Disconnect the test leads from the meter.

2. Remove the protective rubber holster.

3. Remove the battery cover (two “B” screws) and the battery.

4. Remove the four “A” screws securing the rear cover.

5. Lift the center circuit board straight up from the connectors to gain access to the fuse holders.

6. Gently remove the old fuse and install the new fuse into the holder.

7. Always use a fuse of the proper size and value

(0.5A/600V fast blow for the 400mA range,

10A/600V fast blow for the 10A range).

8. Align the center board with the connectors and gently press into place.

9. Replace and secure the rear cover, battery and battery cover.

WARNING: To avoid electric shock, do not operate your meter until the fuse cover is in place and fastened securely.

ISO‐9001 Certified

www.extech.com

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