User's Guide
True RMS Multimeter
Extech 430
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
FAX 781.665.0780 - 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
This symbol adjacent to another symbol,
terminal or operating device indicates that the
operator must refer to an explanation in the
Operating Instructions to avoid personal injury
or damage to the meter.
WARNING
CAUTION
MAX
600V
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.
This symbol adjacent to one or more terminals
identifies them as being associated with
ranges that may, in normal use, be subjected
to particularly hazardous voltages. For
maximum safety, the meter and its test leads
should not be handled when these terminals
are energized.
This symbol indicates that a device is
protected throughout by double insulation or
reinforced insulation.
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OVERVOLTAGE CATEGORY III
This meter meets the IEC 610-1-95 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
Function Maximum Input
mA AC/DC 500mA 250V fast acting fuse
A AC/DC 20A 250V fast acting fuse(30
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
400mV range
seconds max every 15 minutes)
250Vrms for 15sec max
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Controls and Jacks
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
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) Ω Ohms
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Specifications
Function Range Resolution Accuracy
DC
Voltage
AC
Voltage
DC
Current
AC
Current
NOTE: Accuracy is stated at 65
400mV 0.1mV
±(0.3% reading + 2 digits)
4V 0.001V
40V 0.01V
±(0.5% reading + 2 digits)
400V 0.1V
1000V 1V
±(0.8% reading + 3 digits)
50 to 400Hz 400Hz to 1kHz
400mV 0.1mV
4V 0.001V
40V 0.01V
400V 0.1V
750V 1V
±(1.5% reading
+ 15 digits)
±(1.5% reading
+ 6 digits)
±(1.8% reading
+ 6 digits)
±(2.5% reading
+ 15digits)
±(2.5% reading
+ 8 digits)
±(3% reading +
8 digits)
400µA 0.1µA
4000µA 1µA
40mA 0.01mA
±(1.5% reading + 3 digits)
400mA 0.1mA
4A 0.001A
20A 0.01A
±(2.5% reading + 5 digits)
50 to 400Hz 400Hz to 1KHz
400µA 0.1µA
4000µA 1µA
40mA 0.01mA
±(1.8% reading
+ 8 digits)
±(3.0% reading
+ 7 digits)
400mA 0.1mA
4A 0.001A
20A 0.01A
±(3.0% reading
+ 8 digits)
o
F to 83oF (18oC to 28oC) and less
±(3.5% reading
+ 10 digits)
than 75% RH.
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Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
FAX 781.665.0780 - TestEquipmentDepot.com
Function Range Resolution Accuracy
Resistance
apacitance
Frequency
Duty Cycle
Temp
(type-K)
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
400Ω 0.1Ω ±(0.8% reading + 4 digits)
4kΩ 0.001kΩ ±(0.8% reading + 2 digits)
40kΩ 0.01kΩ
400kΩ 0.1kΩ
4MΩ 0.001MΩ
40MΩ 0.01MΩ ±(3.0% reading + 5 digits)
40nF 0.01nF
400nF 0.1nF
4µF 0.001µF
40µF 0.01µF
100µF 0.1µF ±(5.0% reading + 5 digits)
5.000Hz 0.001Hz
50.00Hz 0.01Hz
500.0Hz 0.1Hz
5.000kHz 0.001kHz
50.00kHz 0.01kHz
500.0kHz 0.1kHz
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%
Pulse width: 100µs - 100ms, Frequency: 5Hz to 150kHz
-4 to 1382°F 1°F
-20 to 750°C 1°C
converter.
±(1.0% reading + 2 digits)
±(5.0% reading + 7 digits)
±(3.0% reading + 5 digits)
±(3.5% reading + 5 digits)
±(1.5% reading + 5 digits)
±(1.2% reading + 2 digits)
±(1.5% reading + 4 digits)
±(1.2% reading + 2 digits)
±(3.0% reading + 3 digits)
(probe accuracy not included)
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