User's Guide
True RMS Multimeter
Extech 430
99 Washington Street
Melrose, MA 02176
Phone 781-665-1400
Toll Free 1-800-517-8431
Visit us at www.TestEquipmentDepot.com
Introduction
Congratulations on your purchase of the Extech 430 (part number EX430) 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.
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
CAUTION
MAX
600V
This WA
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.
RNING symbol indicates a potentially hazardous situation, which if not
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CAUTIONS
Improper use of this meter can cause damage, shock, injury or death. Read and understand
this user manual before op
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 op
meter. Rep
Use great care when making measurements if the voltages are greater than 25VAC
35VDC. Th
Always discharge capacitors and remove power from the device under test before pe
Diode, Resistance or Continuit
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 ens
the terminals are not "live".
If the equipment is used in a manner not specified by the manufacturer, the protection
y the equipment may be impaired.
b
This device is not a toy and must not reach children’s hands. It contains
well as small parts that the children could swallow. In case a child swallows any of them,
please contact a ph
Do not leave batteries and packing material lying around unattended; they can be da
for children if the
In case the device is going to be unused for an extended period of time, remove the
to prevent them from training
Expired or damaged batteries can cause cauterization on contact with the skin. Always
therefor
See that the batteries are not short-circuited. Do not throw batteries
air or replace any damage befor
ese voltages are considered a shock ha
y use them as toys
e, use suitable hand gloves in such case
erating
the meter.
sts.
y te
ysician immediately
e use.
erating the
rms or
zard.
rforming
ure that
provided
hazardous objects as
ngerous
batteries
,
s
into the fire.
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OVERVOLTAGE CATEGORY III
This meter meets the IEC 610-1-2001 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:
V DC or V AC 1000V DC/750V AC, 200Vrms on 400mV range
Function Maximum Input
mA AC/DC 500mA 250V fast acting fuse
A AC/DC 20A 250V fast acting fuse(30 seconds max every 15
Frequency, Resistance, Capacitance,
Duty Cycle, Diode Test, Continuity
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.
Input Protection Limits
minutes)
250Vrms for 15sec max
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Controls and Jacks
1. 4000 count LCD display
2. HOLD
3. SELECT button
itch
4. Function
sw
5. mA, uA and A input jacks
6. COM input jack
7. Positive
8.
RANGE hold butt
9. RELATIVE
input
butto
jack
on
n
10. Backlight button
11. Protective holster
: Tilt stand and battery compartment are on rear of unit.
Note
Symbols and Annunciators
•))) Continuity
Diode test
Battery status
Test lead connection
error
n nano (10
µ micro (10
m milli (10
k kilo (10
M mega (10
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
-9
) (capacitance)
-6
) (amps, cap)
-3
) (volts, amps) A Amps
3
) (ohms) F Farads (capacitance)
6
) (ohms) Ohms
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