Extech Instruments 381626 Manuale utente

Pen Multimeter

Model 381626

CAUTION: Read, understand and follow all

Safety Rules and Operating Instructions in this

manual before using this product.

This instrument is a 3200 count pen style digital

multimeter. It can be used for measuring AC or DC

voltage, AC or DC current, resistance, diodes and

continuity. It can also be used as a logic test pen. The

measuring ranges are changed automatically or can

be manually set. All measurements are displayed with

0.6 inch high characters with full parameter symbols.

This meter is easily operated and all ranges have

overload protection. It is an ideal instrument for use in

the home, factory, school and laboratory. The DMM is

for indoor use only. It is UL 1244 listed.

WARNING: USE EXTREME CAUTION IN THE USE OF

THIS DEVICE. Improper use of this device can result

in injury or death. Follow all safeguards suggested in

this manual. In addition to the normal safety

precautions used in working with electrical circuits.

DO NOT service this device, if you are not qualified to

do so.

EXTECH INSTRUMENTS CORPORATION warrants this

instrument to be free of defects in parts and

workmanship for one year from date of shipment. 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

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.

Version 1.1 4 August, 2000

SPECIFICATIONS

Ranges Resolution Accuracy

DC Voltage 300mV, 3V

30,300, 500V 100µV+(1.5% reading + 5 digits)

+(1.0% reading + 2 digits Input Impedance 10MΩ

Max Input 500V AC/DC

AC Voltage 3, 30, 300, 500V 1mV +(1.5% reading + 8 digits) AC Freq. Response:

DC Current 30, 300mA 10µA+(1.5% reading + 3 digits) 40Hz to 400Hz

AC Current 30, 300mA 10µA+(2.0% reading + 5 digits) Average responding

Resistance 300,3k,30k,300kΩ

3MΩ

30MΩ

0.1 ohms +(1.5% reading + 5 digits)

+(2.0% reading + 8 digits)

+(3.0% reading + 10 digits)

Overload Protection:

250VAC rms

Open ckt. V: 0.6V -

1.2V

Continuity Buzzer sounds for resistance less than 20 ohms (approximately)

Logic <1V Logic low, 1V to 2V Indeterminate, >2V Logic High, 3V reference, 220kΩinput impedance

Power supply Two 1.5V AAA batteries

Dimmensions/Wt. 1x7.5x1.9” (26x191x40mm) / 3.9oz (120gm)

SAFETY INSTRUCTIONS

This meter has been designed to be safe in use, but the

rules listed below should be carefully followed for safe

operation.

1. NEVER apply voltage or current to the meter that

exceeds the specifications.

2. USE EXTREME CAUTION when working with high

voltages.

3. DO NOT measure voltage above 500V DC or AC rms.

4. ALWAYS turn off the power and disconnect the test

leads before replacing the fuse or battery.

FUNCTIONAL DESCRIPTION

1. Data Hold Button

2. Range Hold Button

3. DC/AC / Button

4. Function Switch

5. Green LED

6. Red LED

7 Common Terminal

8. Positive Test Probe

9. Battery & Fuse Door

10. LCD Display & Bargraph

11.

Function Switch Settings

Switch

Button VΩALogic

DC, DCV ΩDCA Logic

AC, ACV ΩACA Logic

Range Hold Button

The Resistance, AC or DC voltage or current ranges can

be selected manually or automatically. The Range Hold

button is used to select the range hold mode as follows.

1. Press to change from automatic to manual ranging.

“RH” is displayed in the manual range mode

2. Press to change range in the manual range mode.

Observe the decimal point position to determine the

range set.

3. Press and HOLD for 2 seconds to change back to

automatic ranging.

Data Hold Button

1. The display will hold the reading when the Data Hold

button is pressed. The “DH” symbol will be displayed.

2. Data Hold will be canceled when the “D-H” button is

pressed again or it will be canceled automatically if the

Function switch is changed to another position.

OPERATION

CAUTION: This meter is a precision electronic instrument.

To avoid damaging the unit, observe all safety statements

contained in this manual.

DC or AC Voltage Measurement

1. Connect the black test lead to the COM jack.

2. Set the Function Switch to the V position and select

AC or DC.

3. Connect the positive test probe and the black test lead

across the source or load under measurement.

For DC voltage, the polarity of the measurement will be

indicated.

DC or AC Current Measurement

1. Connect the black test lead to the COM jack.

2. Set the Function Switch to the mA position and select

DC or AC.

3. Connect the positive test probe and the black test lead

in series with load under measurement.

For DC current, the polarity of the measurement will be

indicated.

Resistance Measurement

1. Connect the black test lead to the COM jack.

2. Set the Function Switch to the Ωposition.

3. Connect the positive test probe and the black test

across the resistance to be measured.

Note: 1) The polarity of the positive test probe is “+”.

2) When checking in-circuit resistance, be sure all

power is removed from the circuit under test and

all capacitors are fully discharged.

Continuity Test

1. Connect the black test lead to the COM jack.

2. Set the Function Switch to the / position and

select with button 3.

3. Connect the positive test probe and the black test lead

to the circuit. If the resistance is less than

approximately 20Ωthe buzzer will sound.

Note: The polarity of the positive test probe is “+”

Diode Test

1. Connect the black test lead to the COM jack.

2. Set the Function Switch to the / position and

select with Button(3)

3. Connect the positive test probe and the black test lead

across the diode under test. If the positive test probe is

placed on the anode of the diode, the display will

indicate the approximate forward voltage drop of the

diode.

Logic Test

1. Connect the black test lead to the COM jack.

2. Set the Function Switch to the L position

3. Connect the black test lead to the common terminal of

the circuit to be tested Connect the test probe to the

point to be tested.

a) If the measured voltage is below the low reference

threshold the GREEN led will light, indicating a logic

“0”.

b) If the measured voltage is above the high reference

threshold the RED led will light, indicating a logic “1”.

c) If the measured voltage is between the reference

thresholds, neither led will light.

4. In the logic testing mode, the measured voltage is

displayed in the LCD.

Battery and Fuse Replacement

NOTE: Do not operate the instrument or connect the test

lead or probe to any circuit with the rear cover open.

1. Remove the screw and open the battery door. Replace

the old batteries or the blown fuse with the same type.

Fuse: 800mA/250V fast blow type

Battery: Two 1.5V AAA or UM-4 type

Indice

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