Extech Extech 381626 Manual

99 Washington Street
Melrose, MA 02176

Phone [phone]
Toll Free 1-800-517-8431

Visit us at www.TestEquipmentDepot.com

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Pen Multimeter

Model 381626

CAUTION: Read, understand and follow all

Safety Rules and Operating Instructions in this
manual before using this product.

Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 - FAX [phone] - TestEquipmentDepot.com

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 [phone] 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 1.2 5/02

SPECIFICATIONS

Ranges Resolution Accuracy
DC Voltage 300mV, 3V

100µV

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

300,3k,30k,300kΩ

10µA
10µA

0.1 ohms +(1.5% reading + 5 digits)
3MΩ
30MΩ

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

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

Operating Temp. 32oF to 122oF (0oC to 50oC)
Storage Temp. -4oF to 140oF (-20oC to 60oC)
Relative Humidity <70% operating, <80% storage
Operating Altitude 2000 meters (7000ft.) maximum
Safety For indoor use and in accordance with Overvoltage Category II, Pollution Degree 2. Category II

includes local level, appliance, portable equipment, etc., with transient overvoltages less than
Overvoltage Category III.

Power supply Two 1.5V AAA batteries
Dimmensions/Wt. 1x7.5x1.9” (26x191x40mm) / 3.9oz (120gm)

Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 - FAX [phone] - TestEquipmentDepot.com

+

(1.5% reading + 5 digits)

+

(1.0% reading + 2 digits

Input Impedance 10MΩ
Max Input 500V AC/DC

+(1.5% reading + 3 digits) 40Hz to 400Hz
+(2.0% reading + 5 digits) Average responding

Overload Protection:

+

(2.0% reading + 8 digits)

+

(3.0% reading + 10 digits)

250VAC rms
Open ckt. V: 0.6V - 1.2V

SAFETY INSTRUCTIONS

Caution ! Refer to the explanation in this Manual

!

Warning ! Risk of electric shock

Earth (Ground)

Double Insulation or Reinforced insulation
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.

5) Voltage checks on electrical outlets can be difficult

and misleading because of the uncertainty of
connection to the electrical contacts. Other means

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

6) The product is intended only for indoor use

7) If the equipment is used in a manner not specified by
the manufacturer, the protection provided by the
equipment may be impaired.

8) Pollution degree: 2

FUNCTIONAL DESCRIPTION

8

9

1

3

4

1. Data Hold Button 8. Positive Test Probe

2. Range Hold Button 9. Battery & Fuse Door

3. DC/AC / Button 10 LCD Display & Bargraph

4. Function Switch

5. Green LED

6. Red LED
7 Common Terminal

2

6107

5

Function Switch Settings

Switch

Button V
DC, DCV
AC, ACV

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.

Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 - FAX [phone] - TestEquipmentDepot.com

A Logic

Ω

DCA Logic

Ω

ACA Logic

Ω

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 Ω position.

3. Connect the positive test probe and the black test probe
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
20Ω the 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

limits, neither LED will light.

4. In the logic testing mode, the measured voltage is
displayed in the LCD.

Auto Power Off

Power will automatically turn off after 30 minutes of
inactivity.

UL Listed

The UL mark does not indicate that this product has been
evaluated for the accuracy of its readings.

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

Repair/Returns: Ext. 210; Email: [e-mail]

Website: www.extech.com

Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 - FAX [phone] - TestEquipmentDepot.com