Extech Instruments EX420A User manual

USER MANUAL
Digital Multimeter
Extech EX420A

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Introduction
Congratulations on your purchase of the Extech EX420A 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
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.
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.
WARNING
CAUTION
MAX
600V

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CAUTIONS
1. Improper use of this meter can cause damage, shock, injury or death. Read and understand
this user manual before operating the meter.
2. Always remove the test leads before replacing the battery or fuses.
3. 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.
4. Use great care when making measurements if the voltages are greater than 25VAC rms or
35VDC. These voltages are considered a shock hazard.
5. Warning! This is a class A equipment. This equipment can cause interference to devices in
the home; in this case the operator can be required to carry out adequate measures to
prevent interference.
6. Always discharge capacitors and remove power from the device under test before
performing Diode, Resistance or Continuity tests.
7. 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".
8. If the equipment is used in a manner not specified by the manufacturer, the protection
provided by the equipment may be impaired.
9. 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
10. Do not leave batteries and packing material unattended; they can be dangerous for children.
11. In case the device is going to be unused for an extended period of time, remove the
batteries to prevent them from draining.
12. Expired or damaged batteries can cause cauterization on contact with skin. Always use
suitable hand protection.
13. 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 (EN61010-1), 2010, 3rd 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
Function Maximum Input
V DC or V AC 600V, 200Vrms on 400mV range
mA AC/DC 500mA 600V fast acting fuse
A AC/DC 10A 600V fast acting fuse (30 seconds max every 15
minutes)
Frequency, Resistance, Capacitance,
Duty Cycle, Diode Test, Continuity
250Vrms for 15sec max
Temperature 60V DC/24V AC
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
3. SELECT button
4. Function switch
5. mA, uA and A input jacks
6. COM input jack
7. Positive input jack
8. RANGE hold button
9. RELATIVE 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 (10-9) (capacitance)
µ micro (10-6) (amps, cap)
m milli (10-3) (volts, amps) A Amps
k kilo (103) (ohms) F Farads (capacitance)
M mega (106) (ohms)  Ohms
Hz Hertz (frequency) V Volts
% Percent (duty ratio) REL Relative
AC Alternating current AUTO Autoranging
DC Direct current HOLD Display hold
ºF Degrees Fahrenheit ºC Degrees Centigrade
1
2
3
4
8
9
10
11
567

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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 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 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 Vjack.
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.
1
2

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CAPACITANCE MEASUREMENTS
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.
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.
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.

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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.
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 Accuracy
DC Voltage 400mV 0.1mV (0.3% reading + 2 digits)
4V 0.001V
(0.5% reading + 2 digits)
40V 0.01V
400V 0.1V
600V 1V (0.8% reading + 3 digits)
AC Voltage 50 to 400Hz 400Hz to 1kHz
400mV 0.1mV (1.5% reading + 15
digits)
(2.5% reading + 15digits)
4V 0.001V
(1.5% reading + 6
digits) (2.5% reading + 8 digits)
40V 0.01V
400V 0.1V
600V 1V (1.8% reading + 6
digits)
(3% reading + 8 digits)
DC Current 400A 0.1A
(1.5% reading + 3 digits)
4000A 1A
40mA 0.01mA
400mA 0.1mA
4A 0.001A (2.5% reading + 5 digits)
10A 0.01A
AC Current 50 to 400Hz 400Hz to 1KHz
400A 0.1A
(1.8% reading + 8
digits) (3.0% reading + 7 digits)
4000A 1A
40mA 0.01mA
400mA 0.1mA
4A 0.001A (3.0% reading + 8
digits)
(3.5% reading + 10
digits)
10A 0.01A
Resistance 4000.1

(0.8% reading + 4 digits)
4k0.001k

(0.8% reading + 2 digits)
40k0.01k
(1.0% reading + 2 digits)
400k0.1k
4M0.001M
40M0.01M

(3.0% reading + 5 digits)
Capacitance 40nF 0.01nF (5.0% reading + 7 digits)
400nF 0.1nF (3.0% reading + 5 digits)
4F 0.001F (3.5% reading + 5 digits)
40F 0.01F
100F 0.1F (5.0% reading + 5 digits)
NOTE: Accuracy is stated at 18oC to 28oC (65oF to 83oF) and less than 75% RH.

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Function Range Resolution Accuracy
Frequency 5.000Hz 0.001Hz (1.5% reading + 5 digits)
50.00Hz 0.01Hz
500.0Hz 0.1Hz
(1.2% reading + 2 digits)
5.000kHz 0.001kHz
50.00kHz 0.01kHz
500.0kHz 0.1kHz
5.000MHz 0.001MHz (1.5% reading + 4 digits)
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.
Duty Cycle 0.1 to 99.9% 0.1% (1.2% reading + 2 digits)
Pulse width: 100µs - 100ms, Frequency: 5Hz to 150kHz
Temp
(type-K)
-20 to 750C 1C (3.0% reading + 3 digits)
(probe accuracy not included)
-4 to 1382F 1F
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 Test current of 0.3mA maximum, open circuit voltage 1.5V DC typical
Continuity Check 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 Average responding
ACV Bandwidth 50Hz to 1kHz
Display 4000 count backlit liquid crystal
Overrange indication “OL” is displayed
Auto Power Off 15 minutes (approximately)
Polarity Automatic (no indication for positive); Minus (-) sign for negative
Measurement Rate 2 times per second, nominal
Low Battery Indication “ ” is displayed if battery voltage drops below operating voltage
Battery One 9 volt (NEDA 1604) battery
Fuses mA, µA ranges; 0.5A/600V fast blow
A range; 10A/600V ceramic fast blow
Operating Temperature 5ºC to 40ºC (41ºF to 104ºF)
Storage Temperature -20oC to 60oC (-4oF to 140oF)
Operating Humidity Max 80% up to 31ºC (87ºF) decreasing linearly to 50% at 40ºC(104ºF)
Storage Humidity <80%
Operating Altitude 2000 meters (7000ft) maximum.
Weight 342g (0.753lb) (includes holster).
Size 187 x 81 x 50mm (7.36” x 3.2” x 2.0”) (includes holster)
Safety For indoor use and in accordance with the requirements for double
insulation to: IEC61010-1 (EN61010-1), 2010, 3rd 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
2. Open the battery compartment
3. 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-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.
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
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.
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.
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