Extech EX410A Operating Manual
USER MANUAL
True RMS Multimeter
Extech EX411A
Additional User Manual Translations available at www.extech.com
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Introduction
Congratulations on your purchase of the Extech EX411A True RMS Multimeter. This meter measures
AC/DC Voltage, AC/DC Current, Resistance, 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
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.
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.
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 throw batteries into fire.
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OVERVOLTAGE CATEGORY III
This meter meets the IEC 61010-1 (EN61010-1) 3rd edition (2010) 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 DC/AC, 200Vrms on 200mV range
mA DC
200mA 600V fast acting fuse
A DC
10A 600V fast acting fuse (30 seconds max every 15 minutes)
Ohms, Continuity
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 cover is in place and fastened
securely.
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Description
1. Rubber holster
2. 2000 count LCD display
3. °F button
4. °C button
5. Function switch
6. mA, uA and A input jacks
7. COM input jack
8. Positive input jack
9. Battery check button
10. Hold button
11. Backlight button
Note: Tilt stand and battery compartment are on rear of
unit.
Symbols and Annunciators
•))) Continuity
Diode test
Battery status
Test lead connection
error
µ micro (10-6) (amps)
m milli (10-3) (volts, amps)
k kilo (103) (ohms)
M mega (106) (ohms) Ohms
A Amps V Volts
AC Alternating current AUTO Autoranging
DC Direct current HOLD Display hold
ºF Degrees Fahrenheit ºC Degrees Centigrade
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