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User Guide
Flexible AC Clamp Meter
3000 Amp / 600 Volt
Model 382400
99 Washington Street
Melrose, MA 02176
Phone 781-665-1400
Toll Free 1-800-517-8431
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
FAX 781.665.0780 - TestEquipmentDepot.com
Visit us at www.TestEquipmentDepot.com
Back to the Extech 382400 Product Page
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Introduction
Congratulations on your purchase of the Model 382400 Extech AC Clamp device. The
Model 382400 features:
True RMS AC measurements
3000A maximum current
600V maximum voltage
Fast Peak Hold feature
MAX-MIN and Data Hold features
Auto Power OFF
This meter is shipped fully test and calibrated. Careful use of this meter will provide 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 measurement ranges.
• Set the function switch to the OFF position when the meter is not in use.
• Remove the batteries if the meter is to be stored for longer than 60 days.
WARNINGS
• Do not install the flexible current probe around bare conductors carrying a voltage
ranging from 30V to 600V unless wearing protective clothing and gloves suitable for
high-voltage work.
• Always inspect and check any damage of the current probe assembly before usage.
Do not use the flexible current probe if any damage is found.
• Do not use the meter on circuits rated higher then 600V.
• Set function switch to the appropriate position before measuring.
• When measuring voltage do not switch to the current mode.
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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 and clamp jaw from circuits or devices under test before
replacing the battery or fuses.
• Use great care when making measurements if the voltages are greater than 25VAC
rms. These voltages are considered a shock hazard.
• 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.
MAXIMUM INPUTS
Function Maximum Input
Current (Amperes) 3000A AC
Voltage (Volts) 600V AC
PER IEC1010 OVERVOLTAGE INSTALLATION CATEGORY
OVERVOLTAGE CATEGORY I
Equipment of OVERVOLTAGE CATEGORY I is equipment for connection to circuits in
which measures are taken to limit the transient overvoltages to an appropriate low
level.
Note – Examples include protected electronic circuits.
OVERVOLTAGE CATEGORY II
Equipment of OVERVOLTAGE CATEGORY II is energy-consuming equipment to be
supplied from the fixed installation.
Note – Examples include household, office, and laboratory appliances.
OVERVOLTAGE CATEGORY III
Equipment of OVERVOLTAGE CATEGORY III is equipment in fixed installations.
Note – Examples include switches in the fixed installation and some equipment for
industrial use with permanent connection to the fixed installation.
OVERVOLTAGE CATEGORY IV
Equipment of OVERVOLTAGE CATEGORY IV is for use at the origin of the
installation.
Note – Examples include electricity meters and primary over-current protection
equipment
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Description
Meter Description
1. Clamp conductor
2. COM test lead input jack
3. Voltage (V) test lead input jack
4. LCD Display
5. HOLD, MIN, MAX, PEAK mode button
6. Function select switch
7. 50/60Hz select push-button
8. Flex Clamp probe
9. Clamp coupling mechanism
Display Description
H Data Hold
MAX Max reading
MIN Min reading
Pk Peak reading
Low battery
V Volts (Voltage)
A Amperes (Current)
HZ Frequency
AP Auto Power OFF
Minus sign Negative reading display
0 to 9999 Measurement display digits
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Operation
NOTES: Read and understand all Warning and Caution statements in this operation
manual prior to using this meter. Set the function select switch to the OFF position when the
meter is not in use.
AC True RMS Current Measurements
WARNING: Ensure that the test leads are disconnected from the meter before making
current clamp measurements.
1. Set the Function switch to the A position.
2. Select the fundamental frequency (50Hz or 60Hz) with the 50Hz-60Hz push-button.
The LCD display will reflect the selected
frequency.
3. Open the clamp loop by pressing the latch tabs
and disconnecting the clamp coupling connector.
4. Fully enclose only one conductor centered inside
the clamp loop. Allow at least 25mm between the
conductor and the clamp coupling connector.
5. The meter’s LCD will display the current (A) and
frequency (Hz) readings.
Note: For measurements lower than 3A, the meter’s
frequency display will indicate ‘0’.
‘OL’ is displayed when the measurement exceeds
the specified maximum limit.
AC True RMS Voltage Measurements
WARNING: Maximum input is 600Vac rms. Do not attempt to take any voltage
measurement that exceeds this limit. Exceeding the limit could cause electrical shock and
damage to the meter.
1. Insert the black test lead into the negative COM terminal and the red test lead into the
positive V terminal.
2. Set the function switch to the V position.
3. Select the fundamental frequency (50Hz or 60Hz)
with the 50Hz-60Hz push-button. The LCD display
will reflect the selected frequency.
4. Connect the test leads in parallel to the circuit under
test.
5. Read the voltage measurement (V) and frequency
(Hz) on the LCD display. ‘OL’ is displayed when the
measurement exceeds the specified maximum limit.
Note: For measurements lower than 30V, the
meter’s frequency display will indicate ‘0’.
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DATA HOLD, MAX-MIN, and PEAK Modes
1. Measure current or voltage as previously described.
2. Press the HOLD button to access the Data Hold mode; an H icon will be displayed.
Use the Data Hold mode to freeze a displayed reading.
3. Press again to access the MAX mode. In the MAX mode, only the highest reading will
be displayed. The MAX icon will be indicated on the LCD display.
4. Press again to access the MIN mode. In the MIN mode, only the lowest reading will
be displayed. The MIN icon will be indicated on the LCD display.
5. Press again to access the PEAK mode. The PEAK display icon will be indicated on
the LCD display.
6. Press and hold the HOLD button for 3 seconds to return to the normal operating
mode.
Note: The sampling time of the PEAK Mode is 39µS (50Hz) or 33µS (60Hz).
HOLD, MAX and MIN display the TRMS value
Automatic Power OFF
In order to conserve battery life, the meter will automatically turn off after approximately 15
minutes. To turn the meter on again, turn the function switch to the OFF position and then
to the desired function position.
To defeat the Auto Power OFF feature, press and hold the HOLD button while turning the
meter on.
Specifications
AC Current
50/60Hz, Auto Range, True RMS, Crest Factor <4
Conductor should be positioned at the center of the flexible loop
Range Resolution Accuracy *
0 to 300.0 AAC
300.0 to 999.9 A
1000 to 3000 A 1A
*Position sensitivity is 2% of range; External field effect of < 40A/m and 200mm from the
coupling is 1% of range; Temperature coefficient is 0.02% of reading/oC.
AC Voltage
50/60Hz, Auto Range, True RMS, Crest Factor <4, Input Impedance 10M ohm, Overload
protection 800V
Range Resolution Accuracy
4.0V to 600.0 VAC 0.1V ± (0.5% reading+ 5 digits)
Frequency
ACV value > 30VAC or ACA value > 30A
Range Resolution Accuracy
45 – 65 0.1 ± 0.2Hz
0.1A
± 1.0% of range
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Probe Specifications
Probe length 24” (610mm)
Bending diameter 1.4” (35mm)
Connector diameter 0.9” (23mm)
Cable diameter 0.5 “(14mm)
Cable length (probe to meter) 6.7” (170mm)
Cable length (meter to output) 6.7” (170mm)
General Specifications
Display Four (4) digit (9999 counts) LCD
Range selection Automatic
Low Battery indication Battery symbol is displayed
Over-range indication ‘OL’ is displayed
Measurement rate 2 readings per second, nominal
Peak Hold Captures peaks 39µS (50Hz) or 33µS (60Hz)
Operating Temperature 14°F to 185 °F (-10°C to 85°C)
Storage Temperature -4°F to 185° F (-20°C to 85°C)
Operating Humidity 15% to 85%
Storage Humidity 15% to 85%
Operating Altitude 7000ft. (2000m) max.
Battery Two (2) 1.5V ‘AA’ batteries
Power consumption 10mA approx.
Auto power OFF After approx. 15 minutes
Weight 15.2 oz. (430g)
Safety For indoor use and in accordance with the requirements for
double insulation to EN61010-1-032 Category III 600V;
Pollution Degree 2.
Approvals CE
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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.
Inspection
Inspect the clamp for damage before each use; have the unit repaired before use if
damage is evident.
Cleaning and Storage
Periodically wipe the meter and probe with a damp cloth and mild detergent; do no use abr
asives or solvents. If the meter is not to be used for 60 days or more, remove the batteries
and store separately.
Battery Replacement
When the low battery symbol appears on the LCD, replace the two 1.5V
‘AA’ batteries.
1. Remove the center Phillips head screw that secures the rear
battery door (see diagram)
2. Open the battery compartment
3. Replace the 1.5V ‘AA’ batteries
4. Secure the battery compartment
99 Washington Street
Melrose, MA 02176
Phone 781-665-1400
Toll Free 1-800-517-8431
Visit us at www.TestEquipmentDepot.com
Back to the Extech 382400 Product Page
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
FAX 781.665.0780 - TestEquipmentDepot.com
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382400 V1.1 06/07
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