EXTECH INSTRUMENTS CORPORATION warrants the basic instrument to be free of
defects in parts and workmanship for one year from date of shipment (a six month
limited warranty applies on sensors and cables). If it should become necessary to return
the instrument for service during or beyond the warranty period, contact the Customer
Service Department at (781) 890-7440 for authorization or visit www.extech.com for
more information. A Return Authorization (RA) number must be issued before any product is returned to Extech. The sender is responsible for shipping charges, freight,
insurance and proper packaging to prevent damage in transit. This warranty does not
apply to defects resulting from action of the user such as misuse, improper wiring,
operation outside of specification, improper maintenance or repair, or unauthorized
modification. Extech specifically disclaims any implied warranties or merchantability or
fitness for a specific purpose and will not be liable for any direct, indirect, incidental or
consequential damages. Extech's total liability is limited to repair or replacement of the
product. The warranty set forth above is inclusive and no other warranty, whether written
or oral, is expressed or implied.
Repair and Calibration Services
Extech offers complete repair and calibration services for all of the products we sell. For
periodic calibration, NIST certification or repair of any Extech product, call customer
service for details on services available. Extech recommends that calibration be
performed on an annual basis to insure calibration integrity.
including the right of reproduction in whole or in part in any form.
Tech Support Hotlines
781-890-7440 ext. 200
extech@extech.com
www.extech.com
380926 V1.1 11/00
3
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 240mA 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
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.
1. WARNING: Improper use of this meter can cause damage, shock, injury or
death. Read and understand this users manual before operating the meter.
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 operating the meter. Repair or replace any damage before use.
5. Do not exceed the maximum rated input limits.
6. Use great care when making measurements if the voltages are greater than
25VAC rms or 35VDC. These voltages are considered a shock hazard.
7. Always discharge capacitors and remove power from the device under test
before performing Capacitance, Diode, Resistance or Continuity tests.
8. Remove the battery from the meter if the meter is to be stored for long
periods.
4
SPECIFICATIONS
Function Range Resolution Accuracy Remarks
AC/DC Current
(Direct Input)
Current Sensor Hall Effect
Zero adjust Automatic except for DCA (Push-button)
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 122F (0oC to 50oC) / <80%
Dimensions 10x2.9x1.5” (255x73x38mm)
Weight 0.85 lbs. (380g)
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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
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.
Symbols
AC current or Voltage
DC current or Voltage
Continuity
HDisplay hold REL Relative
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 and hold the DCA ZERO
button until the reading indicates zero.
4. Press the trigger to open jaw. Fully enclose the conductor to be
measured.
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
Current Measurements using the Test Leads, DC/AC
1. Set the Function switch to the mA or uA 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 uA
input jack.
4. Break the circuit under test (put the meter in series with circuit under test).
5. Read the measured value from the LCD display.
NOTE: The maximum reading for direct input current is 240mA AC/DC.
Voltage Measurements, DC/AC
before making current measurements with the clamp jaw.
using the Clamp.
auto-range mode. If the REL button is used, the clamp meter will be placed in the
manual range mode.
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.
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 ΩΩ position.
2. Press the FUNC key until the ohms symbol appears on the LCD.
3. Insert the black test lead to the COM input jack and the red test lead to the ΩΩ input
jack.
4. Connect test leads to the device to be measured.
5. Read the measured value from the LCD display.
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Continuity Test
Red Black Black Red
Forward test Reverse test
1. Set the Function switch to the position.
2. Press the FUNC key until the "ΩΩ " and " " symbols appear on the display.
3. Insert the black test lead to the COM input jack and the red test lead to the ΩΩ input
jack.
4. Connect the test lead tips to the device to be measured.
5. Read the measured value from the LCD display.
6. If the resistance is < 10Ω approx. an audible signal will be heard.
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.
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.
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.
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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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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