Extech EX840 Operating Manual
User's Guide
Extech EX840 True RMS 1000 Amp
Clamp Meter with IR Thermometer
Introduction
Congratulations on your purchase of the Extech EX840 CAT IV True RMS 1000A Clamp
Meter. This meter measures AC/DC Voltage, AC/DC Current, Resistance, Capacitance,
Frequency, Duty Cycle, Diode Test, Continuity, Type k thermocouple thermometer plus
Non-Contact IR 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
SAFETY NOTES
• Do not exceed the maximum allowable input range of any function.
• Do not apply voltage to meter when resistance function is selected.
• Set the function switch OFF when the meter is not in use.
• Remove the battery if meter is to be stored for longer than 60 days.
WARNINGS
• Set function switch to the appropriate position before measuring.
• When measuring volts do not switch to current/resistance modes.
• Do not measure current on a circuit whose voltage exceeds 600V.
• When changing ranges always disconnect the test leads from the circuit under test.
Function Maximum Input
A AC, ADC 1000A DC/AC
V DC, V AC 1000V DC/AC
Resistance, Capacitance, Frequency, Diode Test 250V DC/AC
Type K Temperature 60V DC, 24V AC
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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 the children could swallow. In case a child
swallows any of them, please contact a physician immediately
• Do not leave batteries and packing material lying around unattended; they can be
dangerous for children if they use them as toys
• In case the device is going to be unused for an extended period of time, remove the
batteries to prevent them from training
• Expired or damaged batteries can cause cauterization on contact with the skin.
Always, therefore, use suitable hand gloves in such cases
• See that the batteries are not short-circuited. Do not throw batteries into the fire.
• Do not directly view or direct the laser pointer at an eye. Low power visible lasers
do not normally present a hazard, but may present some potential for hazard if
viewed directly for extended periods of time
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Description
Meter Description
1. Current clamp
2. Clamp opening trigger
3. Data Hold Button
4. Mode
5. Peak
6. Range
7. DCA Zero
8. MIN/MAX
9. Backlit LCD Display
10. Test lead input jacks
11. IR thermometer and laser pointer (rear)
12. Backlight Button
13. Laser pointer button
14. Function switch
Display icons Description
HOLD Data Hold
Minus sign Negative reading display
0 to 3999 Measurement display digits
ZERO Zero
P Peak value
AUTO Auto Range mode
DC/AC Direct Current / Alternating
MAX Max reading
MIN Min reading
Low battery
mV or V Milli-volts or Volts (Voltage)
Ω Ohms (Resistance)
A Amperes (Current)
F Farad (Capacitance)
Hz Hertz (Frequency)
o
F and oC Fahrenheit and Celsius units (Temperature)
n, m, μ, M, k Unit of measure prefixes: nano, milli, micro, mega, and kilo
)
)
•
) Continuity test
Current
Diode test
Laser pointer
1
2
3
5
6
9
10
11
12
13
14
8
4
7
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