Extech Instruments 381285 User manual

WARNING

MEASUREMENT OF VOLTAGE IN OSCILLOSCOPE MODE

GREATER THAN 250VAC OR 360VDC

WILL RESULT IN PERMANENT DAMAGE AND POSSIBLE INJURY

User's Guide

Handheld MultiScope

Model 381285

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V2.0 03/05

Table of Contents

Section Page

Warranty 3

Safety 4

Specifications 5

Symbols and Annunciators 8

Soft Keys and Sub Menus 8

Operation (Oscilloscope) 10

AC and DC Voltage 10

Time/Div 11

Volt/Div 11

Trigger 11

More 11

Single 11

Glitch 12

Position 12

Cursor 13

Operation (Digital Multimeter) 14

AC and DC Volts 14

Resistance 15

Continuity 15

Diode 15

AC and DC Current 16

Capacitance 16

Relative 17

Avg Min Max 17

Peak Hold 17

Limit 18

Sig. Out 18

Frequency Counter, Duty Cycle and Dwell 19

Automotive RPM 19

Logic Analyzer 19

Set Up 20

Aux 20

Backlight 21

Auto/Manual Range 21

Help 21

Print 21

Tilt Stand 21

RS232 Commuincations 22

Maintenance 23

Battery Replacement 23

Fuse Replacement

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V2.0 03/05



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

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 on 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 at

www.extech.com (click on ‘Contact Extech’ and go to ‘Service Department’ to request an

RA number). 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 Service 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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V2.0 03/05

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 for the

function selected.

Input Limits

Function Maximum Input

V DC 1000V DC within 10 seconds

V AC 700V AC within 10 seconds

Ohms 250V DC/AC within 10 seconds

mA DC/AC 250V/500mA fused

20A DC/AC 250V/20A fused, 20A for 30 seconds max

each 15 minutes

Logic Analyzer 50V p-p

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 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 is in place and fastened securely.

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

The WARNING symbol indicates a potentially hazardous situation which, if not

avoided, could result in serious injury or death

The CAUTION symbol indicated a potentially hazardous situation which, if not

avoided, may result in minor or moderate injury

WARNING

CAUTION

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V2.0 03/05

WARNING

MEASUREMENT OF VOLTAGE IN OSCILLOSCOPE MODE

GREATER THAN 250VAC OR 360VDC

WILL RESULT IN PERMANENT DAMAGE AND POSSIBLE INJURY

Specifications

DIGITAL MULTIMETER

DC Voltage

Range Resolution Accuracy

400mV 0.1mV

4V 0.001V

40V 0.01V

400V 0.1V

1000 V 1V

±(0.3%rdg + 5dgt)

AC Voltage (True rms)

Accuracy

Range Resolution

50Hz to 1kHz 1kHz to 10kHz 10kHz to 30kHz

400mV 0.1mV ±(1.0%rdg + 10dgt) ±(5.0%rdg + 10dgt) not specified

4V 1mV ±(2.0%rdg + 10dgt)

40V 10mV

400V 100mV

±(0.75%rdg + 10dgt) ±(1.0%rdg + 10dgt) ±(5%rdg + 5dgt)

700 V 1V ±(1.0%rdg + 10dgt) not specified not specified

Resistance

Ranges Resolution Accuracy

4000.1

4k1

40k10

400k0.1k

4M1M

±(0.5%rdg + 10dgt)

40M10M±(1%rdg + 5dgt)

DC Current

Ranges Resolution Accuracy

40mA 0.01mA

400mA 0.1mA ±(1.2%rdg + 10dgt)

4A 1mA

20A 10mA ±(1.5%rdg + 10dgt)

AC Current (True rms)

Accuracy

Ranges Resolution 50Hz to 1kHz 1kHz to 10kHz

40mA 0.01mA

400mA 0.1mA ±(1.2%rdg + 10dgt) ±(4%rdg + 10dgt)

4A 1mA

20A 10mA ±(2.0%rdg + 10dgt) ±(4%rdg + 10dgt)

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V2.0 03/05

Capacitance

Ranges Resolution Accuracy

40nF 0.01nF

400nF 0.1nF

4µF 1µF

40µF 10µF

100µF 0.1µF

±(2%rdg + 10dgt)

Frequency Counter

Range Resolution Accuracy

0.5Hz to 45MHz 0.1Hz ±(0.1%rdg + 5dgt)

Signal Output

Range Form Amplitude

2.5Hz to 78kHz Square wave, 50% duty cycle,

300/10% steps (approx) 5V p-p

Automotive RPM

Range RPM1 RPM2

0 to 12000 rpm DIS electronic type engine (2

cycle engine)

Distributor type engine

(4 cycle engine)

Logic Analyzer

Channels Sweep Time Sweep Mode

1 125ns to 2s per division (23 divisions) Auto

Diode Test Open circuit voltage: 5V max

dB (-80 to +80dB) 2, 3, 8, 16, 50, 75, 93, 110, 125, 135, 150, 300, 600, 900, 1000, or 1200

ohms reference

Continuity Buzzer sounds for < 60

Auxiliary Input 400.0mV DC range scaled for direct display of temperature, relative

humidity or current (1 unit per mV)

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V2.0 03/05

DIGITAL STORAGE OSCILLOSCOPE

Channels 1

Bandwidth DC to 5MHz

Sample rate 25Mega samples per second

Vertical Sensitivity 10mV/div to 200V/div (14 divisions)

Time base 125ns. to 2sec. per division (23 divisions)

Glitch capture 500nsec. (minimum)

Trigger Level adjustable ±2 divisions (in 0.1 steps)

(Positive or negative edge moving trigger)

COMMON SPECIFICATIONS

Display 160x160 pixel graphic LCD with EL backlight

Viewing Area 2.48” x 2.48” (63 x 63mm)

Measurement rate Digital: 4 times/sec. Bargraph: 7 times/sec.

AC Response True rms

Crest Factor 3 at full scale, 5 at half scale

Input Impedance 10Mfor numerical display, 1Mfor graphical display

Auto Power Off 30 minutes (with disable feature)

Min/Max/Avg. Displays minimum, average, & maximum readings over time

Hold Captures displayed reading

Overrange Indicates “OVER”

Storage 15 pages (text or graphics)

Dimensions 3.6x7.6x2.2inches (92x192x55mm)

Weight 1.0lbs. (450gm)

Power 6 size AA cells, 6 size AA NiMH batteries, 3 dual cell NiMH Battery

Packs or AC adaptor

Charging time 10 hours approx.

Operating time Alkaline (6hrs approx.), NiMH (6hrs approx.)

Temperature Operating: 32OF to 104OF (0OC to 40OC), Storage (NiMH batteries

removed): -4OF to 140OF (-20OC to 60OC),

Charging: 32OF to 113OF (0OC to 45OC)

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Meter Description

1. RS232 pc interface connector

2. LCD Dot matrix display

3. Soft function keys

4. Display storage key

5. Scope/multimeter key

6. Function switch

7. Sig. Out, mA, Frequency jack

8. 20A jack

9. AC adaptor jack

10. Help key

11. Hold key

12. Mode keys

13. Com jack

14. Volts, ohms, cap, diode jack

Symbols and Annunciators

A Ampere

AC alternating current

AUTO autoranging

AVG average

CALL recall stored data

CLEAR remove stored data

dB decibel

DC direct current

F farads(capacitance)

LIMIT compare

GLITCH glitch waveform

Hz hertz(frequency)

MANU manual

RESET reset

MAX maximum

MIN minimum

ms milliseconds

ºC degrees centigrade

ºF degrees fahrenheit

PAUSE pause in min/max

peakhold, single

glitch mode

P-H peak hold

RANGE manual range

REL relative

RPM 1 2 stroke - DIS Engine

RPM 2 4 stroke Engine

RUN restart in peak hold,

min/max mode

SAVE saves present signal

in memory

SINGLE single waveform

SLEEP auto shut-off

TEST self test

TIME manually change time

base

TRIG frequency trigger

V volts

ohms(resistance)

%Rh relative humidity

buzzer, continuity

diode

cursor ( left or right )

cursor( up or down )

low battery

over range on V & A

AC adaptor in use

t signal pulse width

1/t frequency

V signal amplitude

time to auto power off

trigger slope

% % DUTY CYCLE

Dwell Degree

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V2.1 03/06

Soft-Keys and Sub-Menus

Soft keys are located directly below the

LCD display and perform multiple

operation as indicated on the LCD and

determined by the function selected by

the rotary switch.

Some functions will produce a sub-menu

on the display for further selection

Operation of the menus and sub-menus

is described in the appropriate operation

paragraph.

F1 to F4 Soft keys, function indicated on graphical display.

Toggle between the multimeter and graphical display mode.

also power reset key to re-activate power if the auto-shutoff is in effect

Save and recall measurement data or graphical display.

also press for 3 seconds to print data or the graphical display

Display the basic meter warning, Input jack locations and test procedures

also press for 3 seconds to enable the RS232 interface.

Toggle between AUTORANGE and MANUAL RANGE.

Toggle between AC and DC measurements in V and A functions.

Logic analyzer function.

Operation of the scope function, V, t%, t, 1/t value display.

"Freezes" the reading on the display.

NOTE : Soft key Reaction Time: The soft keys react ONLY AFTER 250msec(millisecond)

for all except in the Oscilloscope Mode ( 500msec).

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V2.1 03/06

Frequency

Cursor width

Vertical (volt) scale

Horizontal (time) scale

Trigger level

Trigger slope

Peak-peak voltage

Waveform

Position

WARNING

MEASUREMENT OF VOLTAGE IN OSCILLOSCOPE MODE

GREATER THAN 250VAC OR 360VDC

WILL RESULT IN PERMANENT DAMAGE AND POSSIBLE INJURY

Operation (Oscilloscope)

AC and DC VOLTAGE

WARNING: Risk of Electrocution. The probe tips may not be long enough to contact the

live parts inside some 240V outlets for appliances (contacts can be recessed deep in the

outlets). As a result, the reading may show 0 volts when the outlet actually is live. Make

sure the probe tips are contacting the metal contacts inside the outlet before assuming

that no voltage is present.

CAUTION: Do not measure AC or DC voltages if a motor on the circuit is being

switched ON or OFF. Large voltage surges may occur during the ON or OFF operations

that can damage the meter.

CAUTION: To avoid meter damage, do not apply 700V AC or 1000V DC for more than

10 seconds.

1. Insert the black test lead banana plug into the negative COM jack and the red test

lead banana plug into the positive Vjack.

2. Set the function switch to the Vposition.

3. Select AC or DC voltage using the AC/DC key (default is AC).

4. Press and momentarily hold the SCOPE key to switch to the graphical display.

5. Touch the test probe tips to the circuit under test and observe the waveform.

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Table of contents

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