Extech Instruments 380941 Manuale utente

User Guide

AC/DC Mini Clamp Meter

Model 380941

•Large 3 3/4 digit LCD display with 40 segment bargraph

•Continuity and Frequency Measurements

•One touch DCA zero adjust

•MIN/MAX and Data Hold functions

•0.9” (23mm) Jaw diameter

Introduction

Congratulations on your purchase of Extech’s DC/AC Clamp Meter. This professional meter,

with proper care, will provide years of safe reliable service.

www.burntec.com

380941 V3.1 10/06

Specifications

General Specifications

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

Functions ACA, DCA, ACV, DCV, Resistance, Frequency, Continuity

Polarity “-“ 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 temperature 4oF to 122oF (-10oC to 50oC)

Operating humidity < 85% RH

Power consumption Approximately 10mA DC

Weight 8 oz. (225g) including battery

Dimensions 7 x 1.75 x 1.25” (178 x 45 x 32mm) (HWD)

Jaw opening 0.9” (23mm)

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

Range Specifications

Function Range Resolution. Accuracy Overload

protect

40A 10mA ±(1.0% +2dgts) 400A DC

0 to 150A 100mA ±(1.0% +2dgts) 400A DC

DC Current

150 to 200A 100mA ±(2.2% +2dgts) 400A DC

50/60Hz 40 to 400Hz

40A 10mA ±(1.0% +3dgts) ±(1.5% +4dgts) 400A AC

0 to 150A 100mA ±(1.0% +3dgts) ±(1.5% +4dgts) 400A AC

AC Current

150 to 200A 100mA ±(2.2% +3dgts) ±(2.5% ±4dgts) 400A AC

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

50/60Hz 40 to 400HzAC Voltage

400V 0.1V ±(1.5% +2dgts) ±(2.0% +4dgts) 800V AC

Resistance 40 to 400Ω0.1 ±(1.0% +2dgts) Beeper <38Ω600V AC

Frequency 100 to 10k 0.01Hz ±0.5% ±2dgts Sensitivity;

2V, 0.1A AC

600V AC

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380941 V3.1 10/06

Front Panel 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. 40 segment bargraph display

9. Positive input terminal for V, HZ and Ω

10. COM terminal

International Symbols

!Caution ! Refer to the explanation in this Manual

Caution ! Risk of electric shock

Earth (Ground)

Safety

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 500V above

earth ground.

4. NEVER connect the meter leads across a voltage source while the function switch is

in the current, resistance or diode mode; doing so can damage the meter.

5. ALWAYS discharge filter capacitors in power supplies and disconnect the power

when making resistance or diode tests.

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

replace the fuse or batteries.

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

place and fastened securely.

www.burntec.com

380941 V3.1 10/06

Operation

AC 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 40 or 200A 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.

3) Read the ACA value on the LCD.

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 40 or 200A 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 DCA value on the LCD.

AC Voltage Measurements

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

measurements that exceed the maximum specified.

1) Set the Function switch to the VAC position.

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

lead to the COM input.

3) With the pointed end of the test leads measure voltage. Remember that voltage

measurements are made in parallel with the device or circuit under test.

4) Read the ACV value on the LCD.

DC Voltage Measurements

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

measurements that exceed the maximum specified.

1) Set the Function switch to the VDC position.

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

lead to the COM input.

3) With the pointed end of the test leads measure voltage. Remember that voltage

measurements are made in parallel with the device or circuit under test.

4) Read the DCV value on the LCD.

Resistance and Continuity Measurements

WARNING: To avoid electric shock or damage to the meter, remove power to the circuit

under test and discharge all capacitors.

1) Set the Function switch to the Ωposition.

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

lead to the COM input.

3) With the pointed end of the test leads measure resistance. Remember that

resistance measurements are made in parallel with the device or circuit under test.

4) Read the resistance value on the LCD.

5) If the resistance is less than 40Ω, the continuity beeper will sound.

www.burntec.com

380941 V3.1 10/06

Frequency Measurements

1) Ensure that at least 0.1A AC is detectable with an ACA measurement before

measuring Frequency.

2) Set the Function switch to the Hz position.

3) Insert the test leads to the meter as follows: Red lead to “V,Hz,Ω” terminal; Black

lead to the COM input.

4) With the pointed end of the test leads measure frequency

5) Read the Frequency measurement on the LCD in Hz.

Additional Features

Relative Measurements

1) Press the Zero key and the present measurement will Zero.

2) All subsequent measurements are 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.

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

Data Hold

To freeze a reading on the LCD, press the Data Hold key. The HOLD icon will appear

and the measurement will be held on the meter’s LCD. To release the Data Hold

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

MIN/MAX Reading Mode

Pressing the MIN/MAX key allows the meter to display ONLY the highest and 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 higher than the previous MAX or lower than the

previous MIN readings is encountered. 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.

www.burntec.com

380941 V3.1 10/06

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 screw.

3) Remove the battery compartment cover and replace the two 1.5V AA cells.

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.

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

www.burntec.com

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