Extech Instruments 38390 Manual de usuario

User's Manual

Digital AC Clamp Meter

Model 38390



Tech Support

Hotlines

781-890-7440 ext. 200

[email protected]

www.extech.com

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 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 ext. 210 for authorization. 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 ensure calibration integrity.

including the right of reproduction in whole or in part in any form.

38390 V1.1 4/02

INTRODUCTION

Congratulations on your purchase of Extech’s 38390 AC Clamp Meter. This autoranging clamp meter measures AC

Current to 400A, DC/AC Voltage, Resistance, 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 users

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 or replace any damage 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 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.

SPECIFICATIONS

Function Range Accuracy Remarks

AC Current 40.00A

400.0A

± (2% + 15 digits) Frequency: 50/60Hz;

660A overload protection

AC Voltage 400.0V

600V

± (1.5% + 10 digits) Frequency: 40Hz to 450Hz;

Input Z: 1MΩ; 660Vrms OL protect

DC Voltage 400.0V

600V

± (1% + 5 digits) Input Z: 1MΩ;

660V overload protect

Resistance 0.3 to 400 Ω± (1% + 5 digits) -1.1 to -1.3V open circuit;

600Vrms overload protect

Continuity Audible tone <40Ωapproximately -1.1 to -1.3V open circuit;

600Vrms overload protect

Note: Accuracy specified as ± (% of reading + number of digits) at 64oF to 82oF (18oC to 28oC) and RH<80%

Conductor Size 0.9" (23mm ) maximum

Operating principle Dual slope integration

Battery type 2 x 1.55V button (ICE LR-44, NEDA 116A or A76)

Battery Life 200 hours

Auto Power off After 30 minutes

Range Selection Automatic ranging

Display 3-3/4 digit (3999 Count) LCD

Overload Indication "OL"

Low Battery Indication Battery icon

Environmental conditions Installation Category II,Pollution degree 2,Altitude up to 2000 meters, Indoor

use only

Operating Temperature/Humidity 32 to 104F (0oC to 40oC) / <80% RH

Storage Temperature/Humidity 14 to 140F (-10oC to 60oC) / <70% RH

Dimensions 7.4 x 2.5 x 1.2” (188 x 62.5 x 30.5mm)

Weight 6.5 oz. (185g)

METER DESCRIPTION

Symbols

AC Current or Voltage

DC Voltage

Continuity

HDisplay Data Hold

AAuto Range

Low Battery icon

Units

V Volt (voltage)

Ω Ohm (resistance)

A Amps (current)

Front panel

1. Jaw opening trigger

2. Function switch (OFF, A, V,

Ω)

3. COM input jack

4. Transformer Jaws

5. DATA HOLD key

6. AC/DC Selector key

7. LCD Display

8. VΩinput jack

OPERATING INSTRUCTIONS

Precautions

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

2. 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.

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

conductors (>600V).

AC Current Measurements

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

making current measurements with the clamp jaw.

1. Set the Function switch to the Arange..

2. Press the trigger to open jaw. Fully enclose one conductor to be measured.

3. The clamp meter will automatically select the proper range (Auto Range).

4. Read the measured value from the LCD display.

DC and AC Voltage Measurements

1. Set the Function Switch to the Vposition.

2. Press the AC/DC key (directly below the HOLD key) to select AC or DC Voltage. The meter will

show the selection with an AC or DC symbol (upper left side of 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.

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

3. Connect test leads to the device to be measured.

4. Read the measured value from the LCD display.

5. If the resistance is < 40Ω(approx.) an audible signal will be heard.

Data Hold

Press the HOLD key momentarily to freeze the present reading on the LCD. "H" will appear in the display. Press the

HOLD key again to return to normal operation.

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