Extech Instruments 38394 Manuale utente

User's Manual

Digital AC/DC Clamp Meter

Model 38394

Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176

FAX 781.665.0780 - TestEquipmentDepot.com

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 38394 Product Info Page

38394 V2.1 03/2002

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, and Continuity.

Proper use and care of this meter will yield 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's manual 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 jaws, 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 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)

38394 V2.1 03/2002

SPECIFICATIONS

Function Range Accuracy

240.0A ±(2% rdg + 5d)

(AC @ 50/60Hz)

AC/DC Current

600A ±(2% rdg + 8d)

AC Voltage 2.400V, 24.00V, 240.0V, 600.0V ±(1.2% rdg + 5d)

(AC @ 50/60Hz)

240.0mV ±(0.5% rdg +2d)DC Voltage

2.400V, 24.00V, 240.0V, 600V ±(1.0% rdg + 2d)

240.0Ω, 2.400kΩ24.00kΩ, 240.0kΩ±(1% rdg + 5d)

2.400MΩ±(2% rdg + 2d)

Resistance

24.00MΩ±(3.5% rdg + 5d)

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

100.0kHz

±(1% rdg + 5d)

Continuity Audible tone <40Ωapproximately

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: 2 x 1.5V AA

Range Selection: Automatic ranging

Display: 5000 Count LCD

Overload Indication: "OL"

Low Battery Indication: Battery icon

Environmental conditions Installation Category II, 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 7.0x4.2x1.3” (178x64x33mm)

Weight 8.3 oz. (230g)

Zero Adjust Uses REL (Relative) push button

Diode Short/Open, Good/Defect Test

Sample Time 0.35 sec approximately.

Input Impedance 10MΩ for ACV & DCV

Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176

FAX 781.665.0780 - TestEquipmentDepot.com

38394 V2.1 03/2002

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

•))) Continuity

Diode test

Hold Display Data Hold

Auto Auto Range

Low Battery icon

V Volt (voltage)

Ω Ohm (resistance)

A Amp (current)

REL Relative Mode

Hz, KHz Frequency

38394 V2.1 03/2002

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 reading and automatically

select the proper range

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 measured value from the LCD display.

Manual Range

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

selected. To manual hold the range, press the RANGE key until the desired display

range is selected. The units of measure and decimal positioning will change with each

press of the RANGE key.

Resistance Measurements

CAUTION: Before taking any in-circuit resistance 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, 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.

Continuity Test

CAUTION: Before taking measurements, remove power from 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 on the upper right-hand portion of

the LCD.

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

5. If the resistance is < 40Ω(approx.) a tone will sound.

38394 V2.1 03/2002

Frequency Measurements

CAUTION: Before taking any in-circuit 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 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 from the LCD display.

Diode Test

CAUTION: Before taking measurements, remove power from 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 on 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 0, the device is shorted

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 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 value.

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

becomes the stored reference.

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.

Using Relative Mode to zero the meter

Press the REL key to zero the meter. Ensure that the test leads and clamp jaw are not

connected to any circuit while doing so. The display will read zero and all subsequent

readings will be displayed relative to zero. Zero as often as necessary.

Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176

FAX 781.665.0780 - TestEquipmentDepot.com

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