Extech Instruments MultiScope 381270 User manual

Owner's Manual

Model 381270 & 381275 MultiScopeTM

CAUTION: Read, understand and follow all Safety Rules and Operating Instructions in

this manual before using this product.

381270 v1.2 04/02

TABLE OF CONTENTS Page

Safety Instructions 3

Safety Symbols 4

Specifications 5

Meter Description 7

Controls 7

Display Symbols 8

Graphical Display Description 9

Operating Instructions 10

AC Voltage Measurements 10

DC Voltage Measurements 10

mV Voltage Measurements 11

Resistance, Conductance and Continuity 11

Capacitance and Diode Measurements 11

mA and uA Current Measurements 11

Current Measurements 12

RPM Measurements 12

Signal Out 12

AUX 12

Install 12

Frequency Measurements 13

Trigger Level 13

Duty Ratio 13

Pulsewidth 13

Period 13

Min Max 13

Memory Storage 14

Auto/Manual Range 14

Relative 14

Peak-Hold 14

dB 14

Time (graphical) 14

Trigger (graphical) 15

Glitch 15

Software 16

Tilt Stand 17

Battery Replacement 17

Fuse Repacement 17

Warranty 18

381270 v1.2 04/02

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.

SAFETY INSTRUCTIONS

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.

•Avoid Working Alone.

•Do not use Non-Rechargeable Batteries (Alkaline, Carbon Zinc etc.) together with

the AC power Adapter.

•Do not turn the Rotary switch to HI-Z/ range while the Test Leads are connected to

a High Voltage

•When measuring resistance (OHMS) be sure the circuit is non-powered. Ohms can

not be measured if there is voltage in the circuit being measured.

•When using the inductive pick up lead, be sure you keep the inductive clamp away

from adjoining high tension spark plugs leads to prevent the clamp from picking up

signals from those leads.

•Use a current clamp to measure circuits exceeding 20A.

•When measuring current, turn the power off before connecting the meter to the

circuit.

•Select the proper function and range for your measurement.

•Never connect more than one set of test leads to the meter.

•Disconnect the live test lead before disconnecting the common test lead.

•Choose the proper range and function for the measurement.

•Do not try voltage or current measurements that may exceed the ratings marked on

the function/range switch or terminal.

•Avoid Electrical Shock. Do not touch the test leads tips or the circuit being tested.

•Never operate the meter unless the back cover and the battery/fuse door are in

place and fastened securely

381270 v1.2 04/02

SAFETY SYMBOLS

This symbol adjacent to another symbol, terminal or operating

device indicates that the operator must refer to an explanation in

the Operating Instructions to avoid personal injury or damage to

the meter.

This WARNING symbol indicates a potentially hazardous

situation, which if not avoided, could result in death or serious

injury.

This CAUTION symbol indicates a potentially hazardous

situation, which if not avoided, may result in minor or moderate

injury or damage to the product or other property.

This symbol advises the user that the terminal(s) so marked must

not be connected to a circuit point at which the voltage, with

respect to earth ground, exceeds (in this case) 500 VAC or VDC.

This symbol adjacent to one or more terminals identifies them as

being associated with ranges that may, in normal use, be

subjected to particularly hazardous voltages. For maximum

safety, the test leads should not be handled when these terminals

are energized.

WARNING

CAUTION

MAX

381270 v1.2 04/02

SPECIFICATIONS

Display 128x64 pixel graphic LCD (view area: 2.8x1.5”, 71.7x39mm)

Measurement rate Digital: 4 times/sec; Bar-Graph: 7 times/sec.

Auto Power Off After 30 minutes of inactivity

Overrange indication “OVER”

Display rate Digital display; 4/second Bargraph; 7/second

Input resistance 10MΩ, >2GΩon mV range

Power 6 size AA cells, 6 size AA Nicad batteries, 2 Ni-Cad Battery

Pack or AC adaptor

Operating time: Alkaline (6hrs approx.), Ni-Cad (8hrs

approx.) Ni-Cad Charging time (3hrs approx.)

Temperature Operating: 32OF to 104OF(0OC to 40OC), Storage (Ni-Cad

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

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

RS232 Interface Baud Rate: 9600, Data bit: 8 bit, Stop bit: 1 bit, Parity: none

Min/Max/Avg. Records minimum, average and maximum value

Hold Captures displayed reading

Storage 15 pages (text or graphic)

Dimensions/weight 4.2x8.3x2.2” (107x210x55mm) / 1.77lbs. (800gm)

Digital Storage Oscilloscope

Display Number of Channels One

Bandwidth DC to 100kHz

Volt / Division (4 divisions) 150mV to 400V

Sample Rate 1.0MSPS

Horizontal Number of Channels One

Second / Division (9 divisions) 10usec. to 1 second

Record length 25 div

Glitch Capture 500nsec. (minimum)

Multimeter Range Resolution Accuracy

400mV 0.1mV

4V 0.001V

40V 0.01V

400V 0.1V

DC Voltage

1000V 1V

±(0.5%rdg + 10dgt)

400mV 0.1mV

4V 0.001V

40V 0.01V

400V 0.1V

AC Voltage True

RMS

700V 1V

±(0.75%rdg + 10dgt) RMS

50Hz to 1kHz

400uA 0.001mA

400mA 0.1mA

DC Current

20A 0.01A

±(1.0%rdg + 10dgt)

400uA 1µA

400mA 0.1mA

AC Current

20A 0.01A

±(1.2%rdg + 10dgt) RMS

50Hz to 1kHz

381270 v1.2 04/02

Multimeter Range Resolution Accuracy

400Ω0.1Ω

4kΩ0.001kΩ

40kΩ0.01kΩ

400kΩ0.1kΩ

4MΩ0.001MΩ

±(1.0%rdg + 5dgt)

Resistance

40Mohms 10kohms ±(3.0%rdg + 5dgt)

Conductance 0025 to 0999nS 1nS ±(3.0%rdg + 5dgt)

4nF 0.001nF

40nF 0.01nF

400nF 0.1nF

4µF 0.001µF

Capacitance

40µF 0.01uF

±(3.0%rdg + 5dgt)

1,000Hz 1HzFrequency

100kHz 1kHz

±(1.0%rdg + 5dgt)

Diode Test 1mV ±(2.0%rdg + 5dgt)

dB -80 to +80dB Reference values: 2, 4, 8, 16, 50, 75, 93,

110, 125, 135, 150, 300, 600, 900, 1000Ω

RPM 12000rpm 10rpm ±(3.0%rdg + 10rpm)

4000usec 1usecPeriod/Pulse

Width 1000msec 1msec

±(3.0%rdg + 5dgt)

Duty Cycle 1 to 100% 0.1% ±(3.0%rdg + 5dgt)

10Hz – 100Hz 1Hz

100Hz - 1000Hz 10Hz

Signal Out

1kHz – 20kHz 1kHz

±(1.2% + 5 digits)

OVERLOAD PROTECTION

Input Overload Protection

Function Maximum Input

V DC, V AC 1000V DC or AC peak, less than 10 sec

mV AC, mV DC 250V DC or AC peak, less than 10 sec

mA DC/AC 400mA DC / AC, Fused: 0.4A/250V ceramic fast blow

20A DC/AC 20A DC or AC, less than 30 sec with a 15 min cool

down period, Fused: 20A/250V ceramic fast blow

RPM 250V Dc or AC rms, less than 10 sec

Period/Pulse Width 250V DC or AC rms, less than 10 sec

Duty Cycle 250V DC or AC rms , less than 10 sec

Capacitance None

Diode None

WARNING: To avoid electric shock and damage to the meter, do not test

any diode or capacitor that has voltage on it

381270 v1.2 04/02

BASIC METER FUNCTIONS

1. RS 232 Computer lnterface Socket

2. AC Adapter Input Socket

3 LCD Screen display

4. Soft keys and labels

5. Buttons (Select mode of operation)

6. Rotary Switch (Select function).

7. Input jacks

CONTROLS

Soft function keys F1, F2,

F3, F4

These four keys perform

the function indicated on

the LCD display. The

function will change

depending on the position

of the rotary switch and the

mode of operation.

RST: Power reset key to re-activate power if the auto-shutoff is in effect after

30 minutes of inactivity.

MODE: Toggle between the multimeter text mode and the oscilloscope

graphics mode. The graphics mode functions in the V, A, and mV

modes.

HOLD: “Freezes” the reading on the display. Press “Hold” again to resume

normal operation. The hold symbol “H” will appear on the display when

Hold is selected.

HELP: Displays three screens (safety, connections, procedure) for the

function selected on the rotary switch. The F4 key steps through the

pages. Press “HELP” to exit.

HZ: Selects the Frequency mode in V functions.

MIN/MAX: Selects the MIN, MAX, Average display.

STORAGE: Store and recall measurement data or graphical display.

RANGE: Holds and selects a measurement range. Hold the key for 2 seconds

to return to auto-range.

381270 v1.2 04/02

BASIC DISPLAYS

Multimeter Mode

Oscilloscope Mode

DISPLAY SYMBOLS

A Ampere

AC Alternating current

AUTO auto ranging

Ave average

BEEPER Button beeper

CALL Recall stored data

CLEAR Remove stored data

dB Decibel

DC Direct current

div division (graph mode)

DUTY Duty cycle

F Farads (capacitance)

Glitc Glitch Waveform

Hi-A High Current

Hi-Z High Impedance

Hz Hertz (frequency)

Max maximum

Min minimum

nS Nano Siemens (Conductance)

oC Degrees Centigrade

oF Degrees Fahrenheit

OUT Signal out

PAUSE Pause in “MIN/MAX” mode

P-H Peak Hold

Psi,kPa Pressure

RANGE manual ranging

REL Relative

RESET Reset

RMS True RMS

RPM revolution per minute

RS232 RS 232 Interface is on

RUN Record in “MIN/MAX” mode

Singl Single Waveform

SLEEP Auto shut-off

TEST Self Test (Install function)

Time Time change (graph mode)

TRIG Frequency Trigger

V Volts

Ωohms (resistance)

%RH Relative Humidty

2 cyl 2 cycle engine

4 cyl 4 cycle engine

Buzzer, Continuity

cursor (left or right)

%& cursor (up or down)

Low Battery Indication

Overrange on A & V ranges.

AC adaptor is connected

381270 v1.2 04/02

GRAPHICAL DISPLAY DESCRIPTION

1. The graphical mode is entered when the “MODE” key is pressed when the function

switch is in the ACV, DCV, mV, ACA or DCA position

2. The amplitude (vertical) and time (horizontal) divisions are selected automatically

when in the autoranging mode. The time division will vary to display the best wave

pattern in the autoranging mode or can be set manually using the “F1” and arrow

keys. The volts/division is determined by the range selected and cannot be varied.

SOFT KEYS AND SUB-MENUS

Function keys F1, F2, F3, and F4 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.

381270 v1.2 04/02

OPERATING INSTRUCTIONS

WARNING: Risk of Electrocution. High-voltage circuits, both AC and DC, are very

dangerous and should be measured with great care.

1. ALWAYS set the power switch to the OFF position when the meter is not in use.

2. If “OVER” appears in the display during a measurement in the manual range mode,

the value you are measuring exceeds the range you have selected. Change to a

higher range.

AUTORANGE / MANUAL RANGE SELECTION

The meter will turn on in the autoranging mode. For most applications this is the

easiest and most accurate method of measurement. For measurements that require

the range to be held:

1. Press the “RANGE” key. The display will change from “AUTO” to “RANGE” (manual

range) with the full scale value displayed.

2. Each time the “RANGE” key is pressed, the next available range will be set.

3. To return to “AUTO” range, hold the “RANGE” key for 4 seconds.

DATA HOLD

The meter will freeze the reading in the display when the HOLD key is pressed. “H”

will apear in the display when HOLD is activated. Press HOLD again to resume

normal operation.

AUTO POWER OFF

The meter will automatically shut off after 30 minutes if a push button is not pressed or

the rotary switch is not moved. The symbol in the upper left of the display indicates the

time left to shut off.

AC VOLTAGE MEASUREMENT

1. Turn the rotary switch to the ACV position.

2. Press the HELP key and then the F4 key to display

procedures, cautions and connection diagrams

regarding ACV measurements.

3. Press the HELP key again to exit the HELP screens.

DC VOLTAGE MEASUREMENT

1. Turn the rotary switch to the DCV position.

2. Press the HELP key and then the F4 key to display

procedures, cautions and connection diagrams

regarding DCV measurements.

3. Press the HELP key again to exit the HELP screens

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