Extech Instruments 380950 Manual de usuario

User's Guide

Model 380950

80A Mini AC/DC Clamp Meter

99 Washington Street

Melrose, MA 02176

Phone 781-665-1400

Toll Free 1-800-517-8431

Visit us at www.TestEquipmentDepot.com

380950 V1.0 6/072

Introduction

Congratulations on your purchase of the Extech 80A Mini AC/DC Clamp Meter. The Model

380950 measures AC/DC Current, AC/DC Voltage, Resistance, Frequency, Capacitance,

Duty Cycle, Diode Test, and Continuity. This clamp meter is shipped fully tested and

calibrated and, with proper use, will provide years of reliable service.

Safety

International 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

SAFETY NOTES

•Do not exceed the maximum allowable input range of any function.

•Do not apply voltage to meter when resistance function is selected.

•Set the function switch OFF when the meter is not in use.

•Remove the battery if meter is to be stored for longer than 60 days.

WARNINGS

•Set function switch to the appropriate position before measuring.

•When measuring volts do not switch to current/resistance modes.

•Do not measure current on a circuit whose voltage exceeds 240V.

•When changing ranges always disconnect the test leads from the circuit under test.

CAUTIONS

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

understand this user manual before operating the meter.

•Always remove the test leads before replacing the battery or fuses.

•Inspect the condition of the test leads and the meter itself for any damage before

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

•Use great care when making measurements if the voltages are greater than 25VAC

rms or 35VDC. These voltages are considered a shock hazard.

•Always discharge capacitors and remove power from the device under test before

performing Diode, Resistance or Continuity tests.

•Voltage checks on electrical outlets can be difficult and misleading because of the

uncertainty of connection to the recessed electrical contacts. Other means should be

used to ensure that the terminals are not "live".

•If the equipment is used in a manner not specified by the manufacturer, the protection

provided by the equipment may be impaired.

Function Maximum Input

A AC, A DC 80A DC/AC

V DC, V AC 600V DC/AC

Resistance, Frequency, Diode Test 250V DC/AC

380950 V1.0 6/073

Meter Description

1. Conductor jaws

2. Jaw opening trigger

3. Function select switch

4. LCD Display

5. ZERO button

6. Data Hold and Backlight Button

7. Mode select button

8. Range select button

9. Hz/%/Duty Cycle button

10. COM input jack

11. V/Ω/Hz jack

12. Battery cover (rear)

AC AC (alternating current)

DC DC (direct currrent)

Minus sign

AUTO AutoRange mode

ZERO ZERO mode

•))) Audible Continuity

HOLD Data Hold mode

Low Battery icon

Diode test mode

m milli

VVolts

AAmps

Kkilo

MMega

ΩOhms

380950 V1.0 6/074

Operation

Notice: Read and understand all WARNING and CAUTION statements listed in the

safety section of this operation manual prior to using this meter. Set the function select

switch to the OFF position when the meter is not in use.

DC/AC Current Measurements

Warning: Disconnect the test leads from the meter before making

current clamp measurements.

1. Set the Function switch to the 80ADC, 4ADC, 80AAC or 4AAC

range. If the range of the measured is not known, select the

higher range first then move to the lower range if necessary.

2. For DC current measurement, press the ZERO key to null the

meter display.

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

be measured.

4. The clamp meter LCD will display the reading.

DC/AC Voltage Measurements

1. Set the rotary function switch to the Vposition.

2. Insert the black test lead banana plug into the negative (COM) jack

Insert the red test lead banana plug into the positive (V/Ω/Hz) jack

3. Select AC or DC with the MODE button

4. Connect the test leads to the circuit under test

5. Read the voltage on the display. The display will indicate the proper

decimal point and value.

Resistance Measurements

1. Set the function switch to the Ω•))) CAP position.

2. Insert the black test lead banana plug into the negative (COM) jack

Insert the red test lead banana plug into the positive (VΩHz)jack.

3. Touch the test probe tips across the circuit or part under test. It is best to

disconnect one side of the part under test so the rest of the circuit will not

interfere with the resistance reading.

4. Read the resistance on the display. The display will indicate the proper

decimal point and value.

Continuity Check

1. Set the function switch to the Ω•))) CAP position.

2. Push the mode button to indicate •))) on the display.

3. Insert the black lead banana plug into the negative (COM) jack

Insert the red test lead banana plug into the positive (VΩ Hz) jack.

4. Touch the test probe tips to the circuit or wire you wish to check.

5. If the resistance is less than approximately 150Ω, the audible signal will

sound. If the circuit is open, the display will indicate “OL.”.

380950 V1.0 6/075

Diode Test

1. Turn the rotary switch to the Ω•))) CAP position.

2. Insert the black test lead banana plug into the negative (COM) jack

Insert the red test lead banana plug into the positive (VΩ Hz)jack.

3. Push the mode button to indicate on the display.

4. Touch the test probes to the diode under test. Typically for a normal diode,

forward voltage will indicate 0.4V to 0.7V. Reverse voltage will indicate

“OL”. Shorted devices will indicate near 0V and an open device will indicate

“OL” in both polarities.

Capacitance Measurements

Warning: To avoid electrical shock, disconnect power to the unit under test and

discharge all capacitors before taking any capacitance measurements. Remove the

batteries and unplug the line cords.

1. Set the function switch to the Ω•))) CAP position.

2. Push the mode button to indicate nF on the display.

3. Insert the black lead banana plug into the negative (COM) jack

Insert the red test lead banana plug into the positive (VΩHz) jack.

4. Press the ZERO key to null the meter display.

5. Touch the test probe tips to the capacitor you wish to check.

6. Read the capacitance value on the display.

Frequency or % Duty Cycle Measurements

1. Turn the rotary switch to the Hz % position.

2. Insert the black test lead banana plug into the negative (COM) jack and the

red test lead banana plug into the positive (VΩ Hz ) jack.

3. Select Hz or % with the HZ/% button.

4. Touch the test probe tips to the circuit under test.

5. Read the frequency on the display.

Analog Signal Output

1. Turn the rotary switch to the DCA or ACA ranges.

2. Insert the black test lead banana plug into the negative (COM) jack and the red test lead

banana plug into the positive (VΩ Hz)jack.

3. Connect the test leads to a multimeter, oscilloscope or chart recorder inputs.

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

5. The analog voltage signal is output to the measuring device.

Note: When measuring DCA, the output signal is DCV. When measuring ACA, the output

signal is both ACV and DCV.

380950 V1.0 6/076

Auto/Manual Ranging

The meter turns on in Autoranging mode. Press the RANGE button to enter manual

ranging. Each press of the range button will step to the next range as indicated by the units

and decimal point location. Press and hold the RANGE button for two seconds to return to

Autoranging mode.

Note: Manual ranging does not function in AC Current or Diode and Continuity check

functions. In Temperature function, it will change the resolution from 0.1° to 1°.

Data Hold

To freeze the LCD meter reading, press the HOLD button. While data hold is active, the

HOLD display icon appears on the LCD. Press the HOLD button again to return to normal

operation.

Backlight

Press and hold the HOLD button for >2 seconds to turn the backlight on/off.

Note: The HOLD feature will activate when the backlight is turned on. Press the HOLD

button again to exit the Hold feature.

Zero Button

Zeros Capacitance and DC Current measurements. Also allows the user to offset the

meter by using the displayed value as the zero reference value. Press the ZERO key

momentarily to activate and to exit Zero mode.

380950 V1.0 6/077

Specifications

Function Range & Resolution Accuracy (of reading)

4.000 ADC ± (2.8% + 10 digits)DC Current 80.0 ADC ± (3.0% + 8 digits)

4.000 AAC ± (3.0% + 10 digits)AC Current

(50/60Hz) 80.0 AAC ± (3.0% + 8 digits)

400.0mV ± (1.0% + 15 digits)

4.000V ± (1.0% + 3 digits)

40.00V

400.0V ± (1.5% + 3 digits)

DC Voltage

600V ± (2.0% + 3 digits)

400.0mV ± (1.0% + 30 digits)

4.000V

40.00V

400.0V

AC Voltage

(50/60Hz)

600V

± (2.0% + 5 digits)

400.0Ω± (1.0% + 4 digits)

4.000kΩ

40.00kΩ

400.0kΩ± (1.5% + 2 digits)

4.000 MΩ± (2.5% + 3 digits)

Resistance

40.00MΩ± (3.5% + 5 digits)

40.00nF ± (5% + 30 digits)

400.0nF ± (3% + 5 digits)

4.000µF

40.00µF ± (3.5% + 5 digits)

Capacitance

100.0µF ± (5% + 5 digits)

5.000Hz ± (1.5% + 5 digits)

50.00Hz

500.0Hz

5.000KHz

50.00KHz

500.0KHz

5.000MHz

Frequency

10.00MHz

± (1.2% + 2 digits)

Sensitivity: 10Vrms min.

0.5% to 99.0% ± (1.2% + 2 digits)Duty Cycle Pulse Width: 100µs-100ms, Frequency: 5Hz to 150KHz

Analog Output

(ACA & DCA

ranges)

10mV/Amp ; Accuracy: ± (5%rdg + 2mV);

Output impedance: approx 3kΩ

380950 V1.0 6/078

Jaw size 0.5" (12.7mm) approx.

Display 4000 count LCD

Continuity Audible tone < 150Ωapprox.

Diode Test Open circuit voltage < 1.5VDC; Test current <1mA (typical)

AC V bandwidth 50Hz to 400Hz

AC A bandwidth 50/60Hz

Low battery indication “ ” is displayed

Overrange indication “OL” is displayed

Auto Power OFF After 25 minutes

Measurement rate 2 per second, nominal

Input Impedance 7.8MΩ(V DC and V AC)

Operating Temperature 14ºF to 122ºF (-10ºC to 50ºC)

Storage Temperature -22oF to 140oF (-30oC to 60oC)

Operating Humidity Max 80% up to 87ºF (31ºC) decreasing linearly to 50% at

113ºF(45ºC)

Storage Humidity <80%

Operating Altitude 6560ft. (2000meters) operating

Batteries (2) 1.5V AAA batteries

Weight 0.44lb (200g)

Size 7.87” x 1.97” x 1.38” (200x50x35mm)

Safety For indoor use and in accordance with the requirements for

double insulation to IEC1010-1 (1995): EN61010-1 (1995)

Overvoltage Category III, Pollution Degree 2.

PER IEC1010 OVERVOLTAGE INSTALLATION CATEGORIES

OVERVOLTAGE CATEGORY I

Equipment of OVERVOLTAGE CATEGORY I is equipment for connection to circuits in

which measures are taken to limit the transient overvoltages to an appropriate low level.

Note – Examples include protected electronic circuits.

OVERVOLTAGE CATEGORY II

Equipment of OVERVOLTAGE CATEGORY II is energy-consuming equipment to be

supplied from the fixed installation.

Note – Examples include household, office, and laboratory appliances.

OVERVOLTAGE CATEGORY III

Equipment of OVERVOLTAGE CATEGORY III is equipment in fixed installations.

Note – Examples include switches in the fixed installation and some equipment for

industrial use with permanent connection to the fixed installation.

OVERVOLTAGE CATEGORY IV

Equipment of OVERVOLTAGE CATEGORY IV is for use at the origin of the installation.

Note – Examples include electricity meters and primary over-current protection equipment

380950 V1.0 6/079



Support line (781) 890-7440

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

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

Product specifications subject to change without notice

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

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

Extech Instruments Corporation, 285 Bear Hill Rd., Waltham, MA 02451

Maintenance

WARNING: To avoid electrical shock, disconnect the meter from any circuit, remove the

test leads from the input terminals and turn OFF the meter before opening the case. Do

not operate with open case.

Cleaning and Storage

Periodically wipe the case with a damp cloth and mild detergent; do not use abrasives or

solvents. If the meter is not to be used for periods of longer than 60 days, remove the

batteries and store them separately

Battery Replacement

1. Remove the two rear battery cover Phillips head screws

2. Open the battery compartment

3. Replace the two 1.5V AAA batteries.

4. Re-assemble the meter

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.

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.

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