Extech Instruments 380942 Manuale utente

INSTRUCTION MANUAL

Model 380942

True RMS AC/DC 30A Mini Clamp-on Meter

•True RMS AC Current and Voltage

•Measure low current with high resolution to 0.1mA AC and 1mA DC

•Auto Power Off

•One touch DCA zero adjust

•MIN/MAX and Data Hold functions

•0.9” (23mm) Jaw diameter

Introduction

Congratulations on your purchase of the Extech Model 380942 DC/AC Clamp Meter.

This meter is shipped fully tested and calibrated and, with proper use, will provide years

of reliable service.

www.burntec.com

Model 380942 Version 2.0 July 2006

Specifications

General Specifications

Display 3-3/4 digit (4000 count) LCD with 40 segment bargraph

Functions ACA, DCA, ACV, DCV

Polarity Minus sign ( - ) indicates negative polarity

Current sensor Hall effect sensor type

Overload indication Left blinking digit

DCA zero adjust One touch zero key

Display rate 2 readings/second (20 readings/second for bargraph)

Battery Two 1.5V AA batteries

Operating conditions 4oF to 122oF (-10oC to 50oC); < 85% Relative Humidity

Storage conditions - 4oF to 140oF (-20oC to 60oC); < 75% Relative Humidity

Altitude Operate at less than 2000 meters (for indoor use only)

Power consumption Approximately 10mA DC

Weight 6.2 oz. (190g) including battery

Dimensions 7.2 x 2.5 x 1.4” (183 x 63.6 x 35.6mm) (H x W x D)

Jaw opening 0.9” (23mm)

Standards IEC 1010 Category III 300V, Category II 600V

Range Specifications

Function Range Resolution Accuracy Overload

protect

4000mA 1mA 40A DCDC Current

30A 10mA

± (2.0% + 3d)

100A DC

50/60Hz 40 to 100Hz

400mA 0.1mA ±(1.5% + 5d) ±(2.0% + 5d) 40A AC

50/60Hz 40 to 1kHz

4000mA 1mA ±(2.5% + 5d) ±(3.0% + 5d) 40A AC

AC Current

(True RMS)

30A 10mA ±(2.0% + 5d) ±(2.5% + 5d) 100A AC

DC Voltage 400V 0.1V ± (1.0% + 2d) 1000V DC

50/60Hz 40 to 1kHzAC Voltage

(True RMS) 400V 0.1V ±(1.5% + 4d) ±(2.0% + 5d) 800V AC

Specification Notes

•AC Voltage and Current Crest Factor: < 3

•AC / DC Voltage Input Impedance: 10MΩ

www.burntec.com

Model 380942 Version 2.0 July 2006

Meter Description

1. Current sense jaw

2. Measurement Trigger

3. Function switch

4. Data HOLD key

5. MAX / MIN key

6. One-touch DCA ZERO key

7. LCD Display

8. Positive input terminal for Voltage

9. COM terminal

345

Safety Symbols and Information

!Caution ! Refer to the explanation in this Manual

Caution ! Risk of electric shock

Earth (Ground)

This meter has been designed to be safe in use, but the operator must use caution in its

operation. The rules listed below should be carefully followed for safe operation.

1. NEVER apply voltage or current to the meter that exceeds the specified maximum:

2. USE EXTREME CAUTION when working with high voltages.

3. DO NOT measure voltage if the voltage on the "COM" input jack exceeds 600V above

earth ground.

4. ALWAYS turn off the power and disconnect the test leads before opening the back to

replace the fuse or batteries.

5. NEVER operate the meter unless the back cover and the battery/fuse door are in place

and fastened securely.

www.burntec.com

Model 380942 Version 2.0 July 2006

Operation

AC Current Measurements (True RMS)

WARNING: To avoid electric shock, disconnect the test leads from the meter before

making current measurements.

1) Set the Function switch to the 400mA, 4000mA, or 30A AC

range.

2) Press the jaw trigger and clamp around, fully enclosing a

single conductor. Do not allow a gap between the two halves

of the jaw. Refer to the diagram at right for the correct way to

enclose a single conductor.

3) Read the AC Current value on the LCD’s digital or bargraph

display.

DC Current Measurements

WARNING: To avoid electric shock, disconnect the test leads from the meter before

making current measurements.

1) Set the Function switch to the mA or 30A DC range.

2) Press the DCA zero key to null the meter display.

3) Press the Trigger to open the current sense Jaw.

4) Fully enclose the conductor to be measured. Do not allow a gap between the two

halves of the jaw.

5) Read the DC Current value on the LCD’s digital or bargraph display.

AC Voltage Measurements (True RMS)

WARNING: To avoid electric shock or damage to the meter, do not make any voltage

measurements that exceed the maximum specified limits.

1) Set the Function switch to the 400V AC position.

2) Insert the test leads to the meter as follows: Red lead to “V” terminal; Black lead to the

COM input.

3) Connect the test leads to the circuit or device under test.

4) Read the AC Voltage value on the LCD’s digital or bargraph display.

DC Voltage Measurements

WARNING: To avoid electric shock or damage to the meter, do not make any voltage

measurements that exceed the maximum specified limits.

1) Set the Function switch to the 400V DC position.

2) Insert the test leads to the meter as follows: Red lead to “V” terminal; Black lead to the

COM input.

3) Connect the test leads to the circuit or device under test.

4) Read the DC Voltage value on the LCD’s digital or bargraph display.

Yes

www.burntec.com

Model 380942 Version 2.0 July 2006

Advanced Features

Relative Measurements

1) Press the ZERO key. The displayed reading will zero and the word ZERO will appear

on the upper portion of the LCD.

2) All subsequent measurements will now be displayed with respect to the zeroed

reading. For example, if a 20A reading is zeroed and a 30A reading is subsequently

measured, the LCD will display 10A.

3) To return to normal operation, press and hold the ZERO key for 2 seconds until the

word ZERO switches off.

4) Note that Relative mode is not available if MIN/MAX mode is enabled.

Data Hold

To freeze the current reading on the LCD, press the Data Hold key. The word HOLD will

appear on the LCD while the meter is in the Data Hold mode. To release the Data Hold

function and return the meter to normal operation, press the Data Hold key again. The

word HOLD will switch off.

MIN/MAX Readings

Pressing the MIN/MAX key allows the meter to display the highest and then the lowest

readings encountered. Press the MIN/MAX key once to view the minimum reading, press it

again to view the maximum reading. Note that the meter will only change its displayed

reading when a measurement is taken higher than the previous MAX or lower than the

previous MIN readings. The HOLD display icon (along with the MIN or MAX icon) will

appear on the LCD in MIN/MAX mode. Pressing the MIN/MAX key a 3rd time returns the

meter to normal operation.

Auto Power Off

To extend battery life, the meter will auto power off after 30 minutes of operation. To

resume operation, either turn the meter OFF and then ON again, or press the HOLD

button. To disable the auto power off function, press down the “HOLD” key while turning

the meter on.

www.burntec.com

Model 380942 Version 2.0 July 2006



Support line (781) 890-7440

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

Repair & Returns: Extension 210; E-mail: repair@extech.com

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

Maintenance

Battery Replacement

1) When the low battery symbol appears on the LCD the batteries must be replaced.

2) Turn the meter OFF and remove the rear battery compartment Phillips screw.

3) Lift off the battery compartment cover and replace the two 1.5V AA batteries.

4) Replace the compartment cover and secure the screw.

Cleaning

Caution: Use only a dry cloth to clean the plastic case.

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 Service Department for

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

annual calibrations be performed to verify meter performance and accuracy.

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.

www.burntec.com

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