99 Washington Street
Melrose, MA 02176
Phone 781-665-1400
Toll Free 1-800-517-8431
User's Manual
2000A Auto Ranging
True RMS Clamp + DMM
MODEL 380926
Visit us at www.TestEquipmentDepot.com
INTRODUCTION
Congratulations on your purchase of Extech’s 380926 Clamp meter + Digital MultiMeter. This
meter can measure to 2000A through the clamp and also measure to 400mA through the test
leads. With Capacitance, Diode and Duty Cycle measurements, this meter provides the user
with a full featured multimeter combined with the high amperage current clamp. Proper use
and care of this meter will yield years of reliable service.
SAFETY
Safety Symbols
WARNING: This indicates that a potentially hazardous condition which, if not avoided,
CAUTION: This indicates that a potentially hazardous condition which, if not avoided,
Safety Precautions
1. WARNING: Improper use of this meter can cause damage, shock, injury or death.
2. Make sure any covers or battery doors are properly closed and secured.
3. Always remove the test leads before replacing the battery or fuses.
4. Inspect the condition of the test leads and the meter itself for any damage before
5. Do not exceed the maximum rated input limits.
6. Use great care when making measurements if the voltages are greater than 25VAC
7. Always discharge capacitors and remove power from the device under test before
8. Remove the battery from the meter if the meter is to be stored for long periods.
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
could result in death or serious injury.
could result in injury or damage to the meter Reply to request.
Read and understand this user’s manual before operating the meter.
operating the meter. Repair or replace any damage before use.
rms or 35VDC. These voltages are considered a shock hazard.
performing Capacitance, Diode, Resistance or Continuity tests.
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Model 380926 Version 3.1 March 2005
METER DESCRIPTION
Front panel
1. Current Sense Jaws
2. Function switch
3. Keypad
4. LCD display
5. Input jacks
Note: The tilt stand and battery
compartment door are
located on the rear of the meter.
1
2
3
4
Symbols
AC current or Voltage
DC current or Voltage
Continuity
H Display hold
REL Relative
AUTO Auto range
Diode
Display Backlight
Units
mV, V millivolt, volt (voltage)
Ω, kΩ, MΩ ohm, kilohm, megohm (resistance)
% percent (duty cycle)
µA, mA, A microamps, milliamps, amps (current)
Hz, kHz hertz, kilohertz (frequency)
nF, µF nanofarad, microfarad (capacitance)
5
3
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
FAX 781.665.0780 - TestEquipmentDepot.com
Model 380926 Version 3.1 March 2005
OPERATING INSTRUCTIONS
Current Measurements using the Clamp, DC/AC
WARNING: Make sure that the test leads are disconnected from the meter’s terminals
WARNING: For safety, use the rubber input terminal cover when measuring current
1. Set the Function switch to 2000A position.
2. Press the FUNC key to select AC or DC current
3. For DC current measurements,
push & hold the DCA ZERO button
until the reading indicates zero.
4. Press the trigger to open jaw. Fully
enclose the conductor to be
measured (see diagram).
5. The clamp meter will automatically
select the proper range (Auto
Range). To select the range
manually, press the RANGE button
before pressing DCA ZERO button.
6. Read the measured value from the
LCD display.
NOTE: If the DCA zero button is used to zero the meter, the clamp meter remains in the
before making current measurements with the clamp jaw.
using the Clamp.
INCORRECT
More than one
auto-range mode. If the REL button is used, the clamp meter will be placed in the
manual range mode.
conductor in jaws
CORRECT
One conductor in jaws
Current Measurements using the Test Leads, DC/AC
1. Set the Function switch to the mA or µA position.
2. Press the FUNC key to select AC or DC.
3. Connect the black test lead to the COM terminal and the
red test lead to the mA µA input jack.
4. Break the circuit under test (put the meter in series with
circuit under test) refer to diagram.
5. Read the measured value from the LCD display.
NOTE: The maximum reading for direct input current is 240mA
AC/DC.
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Model 380926 Version 3.1 March 2005
µA and mA
Current
Voltage Measurements, DC/AC
1. Set the Function Switch to the V
position.
2. Press the FUNC key to select AC or DC.
3. Insert the black test lead to the COM
input jack and the red test lead into the
V input jack.
4. Connect the test leads in PARALLEL
with the circuit to be measured (see
diagrams).
5. Read the measured value from the LCD
display.
Resistance Measurements
CAUTION: Before taking any in-circuit resistance measurements
remove power from the circuit under test and discharge all
capacitors.
1. Set the Function switch to the Ω position.
2. Press the FUNC key until the ohms symbol appears on LCD.
3. Insert the black test lead to the COM input jack and the red
test lead to the Ω input jack.
4. Connect test leads to the device under test (see diagram).
5. Read the measured value from the LCD display.
Continuity Test
1. Set the Function switch to the position.
2. Press the FUNC key until the "Ω" and " " symbols appear on the display.
3. Insert the black test lead to the COM input jack and the red test lead to the Ω input
jack.
4. Connect the test lead tips to the device to be measured (refer to diagram for
resistance measurements above).
5. Read the measured value from the LCD display.
6. If the resistance is < 10Ω approx. an audible signal will be heard.
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Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
FAX 781.665.0780 - TestEquipmentDepot.com
Model 380926 Version 3.1 March 2005
Diode Test
1. Set the Function switch to the diode position.
2. Press the FUNC key until the symbol appears on the LCD.
3. Insert the black test lead to the COM input jack and the red test lead to the input
jack.
4. Connect the test lead tips to the diode. A typical diode forward voltage drop will
indicate 0.3 to 0.7V. The reverse drop will indicate "OL", indicating high impedance.
Proper diode check should include both forward and reverse tests.
RED REDBLACK BLACK
FORWARD TEST REVERSE TEST
Frequency Measurement
1. Set the Function switch to the Hz position.
2. Press the FUNC key until the "Hz" symbol appears on the LCD.
3. Insert the black test lead to the COM input jack and the red test
lead to the Hz input jack.
4. Connect the tips of the test leads to the device to be measured
(see diagram).
5. Read the frequency value in Hz on the LCD.
Duty Cycle Measurements
Follow the steps as for Frequency measurements with the following exception: Press the
“Hz/%” key until the “%” symbol appears on the display.
Capacitance Measurement
1. Set the Function switch to the position.
2. Press the FUNC key until the "nF" symbol appears on the LCD.
3. Insert the black test lead to the COM input jack and the red test
lead to the red input terminal.
4. Connect the tips of the test leads to the device to be measured
(see diagram).
5. Read the capacitance value on the display.
NOTE: When making very low capacitance measurements, use the
REL function to zero any stray capacitance.
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Model 380926 Version 3.1 March 2005
Automatic / Manual Range Selections
The meter defaults to the autoranging mode when turned on. "AUTO" will appear in the
display. To select manual ranging, press the RANGE key. Momentary presses of the
RANGE key will step through the ranges. To return to the Auto Range mode, press and
hold the RANGE key for 2 seconds.
Relative Reading Measurements
Press the REL key to enter the relative mode. "REL" will appear in the display. In the
relative mode, the meter stores the reading that was on the display at the time of the
REL key is pressed and displays the difference between the measured value and the
stored value
Press the REL key to return to normal mode.
Data Hold / Backlight key
Press the HOLD key momentarily to freeze the present reading on the LCD."H" will
appear in the display. Press HOLD again to return to normal operation.
Backlight
Press and hold the Hold key for 2 seconds to activate the backlighting. The backlight
will automatically turn off to conserve energy after approx 12 seconds.
MAINTENANCE
Battery Replacement
When the low battery symbol appears on the LCD, replace the meter’s 9V battery.
1. Remove power to the meter and remove test leads from meter
2. Remove the Phillips head screw (back of meter) and open the battery compartment.
3. Remove and replace the 9V battery.
4. Replace the compartment cover and rear screw.
Fuse Replacement
NOTE: Fuse Rating: 500mA (5mm x 20mm diameter)
1. The meter is provided with one overload protect 500mA fuse for current
measurements (direct input NOT clamp measurements).
2. To replace the fuse, open the meter case by removing the battery cover and battery
and then the four screws holding the rear case.
3. The fuse is located on the Main PCB.
4. Replace fuse and secure meter case.
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Model 380926 Version 3.1 March 2005
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
FAX 781.665.0780 - TestEquipmentDepot.com
SPECIFICATIONS
Function Range Resolution Accuracy Remarks
(Clamp on)
AC Voltage
True RMS
400.0A 0.1A ±(2.0% + 5d) AC/DC Current
2000A 1A ±(2.0% + 8d)
4.000V 1mV
±(1.2% + 5d) 45Hz to 1KHz
40.00V 10mV
400.0V 0.1V
45Hz to 1KHz
Input Impedance:
10Mohms
1000V 1V
DC Voltage
400.0mV 0.1mV ±(0.5% + 2d)
4.000V 1mV
±(1.0% + 2d)
Input Impedance:
10Mohms
40.00V 10mV
400.0V 0.1V
1000V 1V
Resistance
400.0 Ω 0.1Ω
±(1.0% + 5d)
4.000 kΩ 1Ω
40.00 kΩ 10Ω
400.0 kΩ 100Ω
±(2.0% + 2d)
±(3.5% + 5d)
±(1.2% + 5d) 45Hz to 1KHz
AC/DC Current
(Direct Input)
4.000 MΩ 1kΩ
40.00 MΩ 10kΩ
400.0µA 0.1µA
4000µA 1µA
40.00mA 0.01mA
400.0mA 0.1mA
Frequency
5Hz 0.001Hz
±(1% + 5d)
50Hz 0.01Hz
500Hz 0.1Hz
5kHz 1Hz
50kHz 10Hz
100kHz 100Hz
Capacitance
50nF 10pF
±(3% + 5d) Accuracy stated
500nF 100pF
5µF 0.001µF
after a relative "REL"
zero performed
50µF 0.01µF
Duty Cycle 1 to 99% 0.1% ±(1% + 5d)
Continuity Audible tone; <10 ohms approximately
Open circuit voltage; 0.5V approximately
Conductor Size 60mm (2.36”) maximum
Measurement parameters ACA, DCA, ACV, DCV, Resistance, Diode, Frequency,
Current Sensor Hall Effect
Zero adjust Automatic except for DCA (Push-button)
Diode Test Test current of 0.6mA typical;
Open circuit voltage <1.6V DC typical.
Battery type 9V NEDA 1604
Range Selection Auto or manual
Display 0.6” (15mm) 5000 Count Backlit LCD
Overload Indication "OL"
Power Consumption 5mA approx.
Low Battery Indication Battery icon appears on LCD
Sampling rate 1 reading every 0.35 seconds approx.
Standards CE, IEC 1010-1 CAT III 1000V
Operating Temperature/Humidity 32 to 122
Dimensions 10 x 2.9 x 1.5” (255 x 73 x 38mm)
Weight 0.85 lbs. (380g)
Capacitance, Duty Cycle, Continuity
o
F (0oC to 50oC) / <80%
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Model 380926 Version 3.1 March 2005
Maximum Rated Input Limits
Function Maximum Rated Input Limits
AC/DC Current 500mA AC/DC (fused)
AC Voltage 1000 VAC/DC
DC Voltage 1000 VAC/DC
Resistance 400 VAC/DC
Frequency 1000 VAC/DC
Capacitance 400 VAC/DC
Duty Cycle 1000 VAC/DC
Diode Test 400 VAC/DC
Back to the Extech 380926 Product Page
Visit us at www.TestEquipmentDepot.com
9
Model 380926 Version 3.1 March 2005
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
FAX 781.665.0780 - TestEquipmentDepot.com
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