Extech Instruments 38394 Manual de usuario

User’s Guide

Digital AC/DC Clamp Meter

Model 38394

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38394 V3.3 8/08

Introduction

Congratulations on your purchase of Extech’s 38394 AC/DC Clamp Meter. This clamp

meter measures AC/DC Current to 600A, DC/AC Voltage, Resistance, Frequency,

Diode, and Continuity. 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.

Safety Precautions

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

understand this User Guide before operating the meter.

1. Always remove the test leads before making current measurements

2. Always remove the test leads before replacing the batteries

3. Inspect the condition of the clamp jaw, test leads and the meter for any damage

before operating the meter. Repair any damage or replace meter before use

4. Do not exceed the maximum rated input limits

5. Use great care when making measurements, especially when the voltages are

greater than 25VAC rms or 35VDC. These voltages are considered a shock hazard

6. Always discharge capacitors and remove power from the DUT (device under test)

before performing Resistance or Continuity tests

7. Remove the batteries from the meter if the meter is to be stored for long periods

8. Ensure that the selected meter function matches the measurement to be taken

9. If the measured current is higher than the range selected for long periods,

overheating may occur compromising the safety and the operation of the meter’s

internal circuits

10. To avoid discharge risks and erroneous readings, do not measure current on high

voltage conductors (>600V)

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38394 V3.3 8/08

Specifications

Function Range Accuracy

400.0A (AC Amps 0.5 to 400.0A) ±(2% rdg + 5d)

(AC @ 50/60Hz)

AC/DC Current

600A ±(2% rdg + 8d)

AC Voltage 4.000V, 40.00V, 400.0V, 600 V ±(1.2% rdg + 5d)

(AC @ 50/60Hz)

400.0mV ±(0.5% rdg +2d)DC Voltage

4.000V, 40.00V, 400.0V, 600V ±(1.0% rdg + 2d)

400.0Ω, 4.000kΩ, 40.00kΩ, 400.0kΩ±(1% rdg + 5d)

4.000MΩ±(2% rdg + 2d)

Resistance

40.00MΩ±(3.5% rdg + 5d)

Frequency (≥5V) 5.000Hz, 50.00Hz, .500.0Hz, 5.000kHz,

50.00kHz, 100.0kHz ±(1% rdg + 5d)

Continuity Audible tone <10Ωapproximately

Function

Maximum

Input

Function

Maximum

Input

V DC/AC 600V DC or

AC Peak Frequency 250V DC or AC peak

Input Limits

A DC/AC 600A DC/AC,

fused Resistance 400V DC or AC peak

(<10 seconds)

Conductor Size 1.18" (30mm) maximum

Battery type Two (2) 1.5V AA batteries

Range Selection Automatic ranging

Display 5000 Count LCD

Overload Indication "1" or “-1”

Low Battery Indication Battery icon

Environmental conditions Installation Category III (clamp); Category II (DMM),

Pollution degree 2; Altitude: 2000 meters, Indoor use

only

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

Storage Temperature/Humidity 14º to 140ºF (-10oC to 60oC) / <80% RH

Dimensions 7.0 x 2.5 x 1.3” (178 x 64 x 33mm)

Weight 8.3 oz. (230g)

Zero Adjust REL (Relative) push button

Diode Short/Open, Good/Defect Test

Sample Time 0.35 sec approx.

Input Impedance 10MΩ for ACV & DCV

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38394 V3.3 8/08

Meter Description

Front panel

1. Current Jaws

2. Jaw opening trigger

3. Rotary function switch

4. REL key

5. DATA HOLD key

6. Function key

7. Range key

8. LCD display

9. COM & V/Ωinput jacks

Symbols and Units of Measure

AC Current or Voltage

DC Voltage

•))) Audible Continuity

Diode test

Hold Display Data Hold

Auto Auto Range

Low Battery icon

V Volt (voltage)

Ω Ohm (resistance)

A Ampere (current)

REL Relative Mode

Hz, KHz Hertz, kilohertz (frequency)

WARRANTY

EXTECH INSTRUMENTS CORPORATION (A FLIR COMPANY) 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.

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38394 V3.3 8/08

OPERATING INSTRUCTIONS

AC/DC 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 600A range.

2. Press the FUNC key to select AC or DC (the AC/DC icons

will toggle on the LCD with each key press).

3. Press the trigger to open jaw. Fully enclose one conductor

to be measured.

4. The clamp meter will display the reading and automatically

select the proper range

Note: When the meter is set to the DCA mode (clamp jaws

empty), the meter’s display may indicate an offset reading, this

is normal. For best results, use the RELATIVE procedure to

zero the meter before taking DCA measurements.

AC/DC Voltage Measurements

1. Set the Function Switch to the Vposition.

2. Press the FUNC key to select AC or DC Voltage. The meter will display the

selected unit of measure (AC or DC) on the left side of the LCD.

3. Insert the black test lead to the COM input jack and the red test lead to the Vjack.

4. Connect the test leads in PARALLEL with the circuit to be measured.

5. Read the displayed measurement value on the LCD display.

Manual Range

This meter automatic selects the range. However, the range can be manually held and

selected. To manually hold the range, momentarily press the RANGE key the

appropriate number of times to select the desired range. The units of measure and

decimal positioning will change with each press of the RANGE key.

Resistance Measurements

CAUTION: Before taking an in-circuit resistance measurement, remove power from the

circuit under test and discharge all capacitors.

1. Insert the black test lead to the COM input jack and the red test lead to the Ωinput

jack.

2. Set the Function switch to the •))) Ωposition, press the FUNC key if necessary

to display the Ω icon.

3. Connect the test leads to the device under test and read the measured value on

the LCD display.

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38394 V3.3 8/08

Continuity Test

CAUTION: Before taking measurements, remove power from the circuit under test and

discharge all capacitors

1. Insert the black test lead to the COM input jack and the red test lead to the Ωinput

jack.

2. Set the Function switch to the •))) Ωposition.

3. Press the FUNC key until the “•)))” icon appears in the upper right-hand area of the

LCD display.

4. Connect the test lead tips to the device under test.

5. If the resistance is < 10Ω(approx.) a tone will sound.

Frequency Measurements

CAUTION: Before taking an in-circuit measurement, remove power from the circuit

under test and discharge all capacitors.

1. Insert the black test lead to the COM input jack and the red test lead to the VΩ

input jack.

2. Set the Function switch to the Hz position.

3. Connect the test lead tips to the device under test.

4. Read the measured value on the LCD display.

Diode Test

CAUTION: Before taking measurements, remove power from the circuit under test and

discharge all capacitors

1. Insert the black test lead to the COM input jack and the red test lead to the V/Ω

input jack

2. Set the Function switch to the •))) Ωposition

3. Press the FUNC key until the icon appears in the upper right-hand side of the

LCD.

4. Connect the test lead tips to the device to be measured

5. Note the displayed reading

6. Reverse the test lead polarity by swapping the red and black lead connection; note

this reading also.

a. If one reading displays a value and the other reading displays “OL”, the

diode is good

b. If both readings display “OL”, the device is open

c. If both readings are very small or zero, the device is shorted

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38394 V3.3 8/08



Support line (781) 890-7440

Technical Support: Extension 200; E-mail: [email protected]

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

Product specifications subject to change without notice

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

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

Extech Instruments Corporation, 285 Bear Hill Road, Waltham, MA 02451

Data Hold

Press the HOLD key momentarily to freeze the present reading on the LCD. Hold will

appear in the display. Press the Hkey again to return to normal operation.

Relative (ZERO) Mode

The Relative mode permits the user to store a reference reading and compare all

subsequent readings to the stored reference value. Subsequent readings will display a

value that is the difference between the actual reading and the stored reference value.

1. Press the REL key when the desired valued is displayed on the meter. This

becomes the stored reference. The REL symbol will appear on the LCD.

2. Take measurements and note that the meter displays the actual reading minus the

reference reading.

3. Press the REL key to return to normal operation. The REL symbol will switch off.

Maintenance

WARNING: To avoid electrical shock or damage to the meter, keep moisture from entering

the meter housing. Also, remove the test leads before opening the meter

housing.

Cleaning

Periodically wipe the case with a damp cloth and mild detergent. Do not use abrasives

or solvents.

Battery Replacement

When the LCD display shows the battery symbol, replace the two ‘AA’ 1.5V batteries.

Accurate readings are possible for a short period of time after the battery symbol

appears, but it is recommended that the batteries be replaced immediately to ensure

accurate results. To replace the batteries, remove the rear battery compartment cover.

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.

www.burntec.comwww.burntec.com

38394 V3.3 8/08

www.burntec.comwww.burntec.com

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