Extech Instruments 380926 Manual de usuario

User's Manual

2000A Auto Ranging

True RMS Clamp + DMM

MODEL 380926

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380926 4.1 07/07

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. This meter is

shipped fully tested and calibrated and, with proper use, will provide years of reliable service.

SAFETY

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

WARNING: This indicates that a potentially hazardous condition which, if not avoided,

could result in death or serious injury.

CAUTION: This indicates that a potentially hazardous condition which, if not avoided,

could result in injury or damage to the meter Reply to request.

Safety Precautions

1. WARNING: Improper use of this meter can cause damage, shock, injury or death.

Read and understand this user’s 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.

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380926 4.1 07/07

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

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)

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380926 4.1 07/07

OPERATING INSTRUCTIONS

Current Measurements using the Clamp, DC/AC

WARNING: Make sure that the test leads are disconnected from the meter’s terminals

before making current measurements with the clamp jaw.

WARNING: For safety, use the rubber input terminal cover when measuring current

using the Clamp.

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

auto-range mode. If the REL button is used, the clamp meter will be placed in the

manual range mode.

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.

INCORRECT

More than one

conductor in jaws

CORRECT

One conductor in jaws

µA and mA

Current

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380926 4.1 07/07

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

Vinput 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 Ωposition.

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 Ωinput 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 Ωinput

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 < 10Ωapprox. an audible signal will be heard.

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380926 4.1 07/07

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

(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.

RED REDBLACK BLACK

FORWARD TEST REVERSE TEST

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380926 4.1 07/07

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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380926 4.1 07/07

SPECIFICATIONS

Function Range Resolution Accuracy Remarks

400.0A 0.1A ±(2.0% + 5d)AC/DC Current

(Clamp on) 2000A 1A ±(2.0% + 8d) 45Hz to 1KHz

4.000V 1mV

40.00V 10mV

400.0V 0.1V

AC Voltage

True RMS

1000V 1V

±(1.2% + 5d) 45Hz to 1KHz

Input Impedance:

10Mohms

400.0mV 0.1mV ±(0.5% + 2d)

4.000V 1mV

40.00V 10mV

400.0V 0.1V

DC Voltage

1000V 1V

±(1.0% + 2d) Input Impedance:

10Mohms

400.0 Ω0.1Ω

4.000 kΩ1Ω

40.00 kΩ10Ω

400.0 kΩ100Ω

±(1.0% + 5d)

4.000 MΩ1kΩ±(2.0% + 2d)

Resistance

40.00 MΩ10kΩ±(3.5% + 5d)

400.0µA 0.1µA

4000µA 1µA

40.00mA 0.01mA

AC/DC Current

(Direct Input)

400.0mA 0.1mA

±(1.2% + 5d) 45Hz to 1KHz

5Hz 0.001Hz

50Hz 0.01Hz

500Hz 0.1Hz

5kHz 1Hz

50kHz 10Hz

Frequency

100kHz 100Hz

±(1% + 5d)

50nF 10pF

500nF 100pF

5µF 0.001µF

Capacitance

50µF 0.01µF

±(3% + 5d) Accuracy stated

after a relative "REL"

zero performed

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,

Capacitance, Duty Cycle, Continuity

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 IV 600V

Operating Temperature/Humidity 32 to 122oF (0oC to 50oC) / <80%

Dimensions 10 x 2.9 x 1.5” (255 x 73 x 38mm)

Weight 0.85 lbs. (380g)

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380926 4.1 07/07

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

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380926 4.1 07/07



Support line (781) 890-7440

Technical support: Extension 200; E-mail: support@extech.com

Repair & Returns: Extension 210; E-mail: [email protected]

Product specifications subject to change without notice

For the latest version of this User’s Guide, Software updates, and other

up-to-the-minute product information, visit our website: www.extech.com

Extech Instruments Corporation, 285 Bear Hill Rd., Waltham, MA 02451

Warranty

EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free of defects

in parts and workmanship for one year from date of shipment (a six month limited warranty

applies to 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 ext. 210 for authorization or visit our website www.extech.com for contact

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.

Calibration and Repair Services

Extech offers repair and calibration services for the products we sell. Extech also

provides NIST certification for most products. Call the Customer Care Department for

information on calibration services available for this product. Extech recommends that

annual calibrations be performed to verify meter performance and accuracy.

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