User's Guide
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Handheld MultiScope
Model 381285
MEASUREMENT OF VOLTAGE IN OSCILLOSCOPE MODE
WILL RESULT IN PERMANENT DAMAGE AND POSSIBLE INJURY
GREATER THAN 250VAC OR 360VDC
WARNING
Table of Contents
Section Page
Warranty 3
Safety 4
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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
2
V2.0 03/05
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
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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
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.
(click on ‘Contact Extech’ and go to ‘Service Department’ to request an
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.
Technical support: Extension 200; E-mail: support@extech.com
Repair & Returns: Extension 210; E-mail: repair@extech.com
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
Support line (781) 890-7440
All rights reserved including the right of reproduction in whole or in part in any form.
Copyright © 2005 Extech Instruments Corporation
3
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
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function selected.
V DC 1000V DC within 10 seconds
Function Maximum Input
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
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
Input Limits
each 15 minutes
WARNING
CAUTION
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
4
V2.0 03/05
Specifications
DIGITAL MULTIMETER
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DC Voltage
Range Resolution Accuracy
400mV 0.1mV
4V 0.001V
40V 0.01V
400V 0.1V
1000 V 1V
AC Voltage (True rms)
Range Resolution
400mV 0.1mV ±(1.0%rdg + 10dgt) ±(5.0%rdg + 10dgt) not specified
4V 1mV ±(2.0%rdg + 10dgt)
40V 10mV
400V 100mV
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
40M 10M ±(1%rdg + 5dgt)
DC Current
Ranges Resolution Accuracy
40mA 0.01mA
400mA 0.1mA
4A 1mA
20A 10mA
AC Current (True rms)
Ranges Resolution
40mA 0.01mA
400mA 0.1mA
4A 1mA
20A 10mA
MEASUREMENT OF VOLTAGE IN OSCILLOSCOPE MODE
WILL RESULT IN PERMANENT DAMAGE AND POSSIBLE INJURY
GREATER THAN 250VAC OR 360VDC
±(0.75%rdg + 10dgt)
WARNING
±(0.3%rdg + 5dgt)
50Hz to 1kHz 1kHz to 10kHz 10kHz to 30kHz
50Hz to 1kHz 1kHz to 10kHz
±(1.2%rdg + 10dgt) ±(4%rdg + 10dgt)
±(2.0%rdg + 10dgt) ±(4%rdg + 10dgt)
Accuracy
±(1.0%rdg + 10dgt)
±(0.5%rdg + 10dgt)
±(1.2%rdg + 10dgt)
±(1.5%rdg + 10dgt)
Accuracy
±(5%rdg + 5dgt)
5
V2.0 03/05
Capacitance
Ranges Resolution Accuracy
40nF 0.01nF
400nF 0.1nF
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4µF 1µF
40µF 10µF
100µF 0.1µF
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,
Automotive RPM
Range RPM1 RPM2
0 to 12000 rpm DIS electronic type engine (2
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
Continuity Buzzer sounds for < 60
Auxiliary Input 400.0mV DC range scaled for direct display of temperature, relative
300/10% steps (approx)
cycle engine)
ohms reference
humidity or current (1 unit per mV)
±(2%rdg + 10dgt)
5V p-p
Distributor type engine
(4 cycle engine)
6
V2.0 03/05
DIGITAL STORAGE OSCILLOSCOPE
Channels 1
Bandwidth DC to 5MHz
Sample rate 25Mega samples per second
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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: 32
removed): -4
Charging: 32
O
F to 104OF (0OC to 40OC), Storage (NiMH batteries
O
F to 140OF (-20OC to 60OC),
O
F to 113OF (0OC to 45OC)
7
V2.0 03/05
Meter Description
1. RS232 pc interface connector
2. LCD Dot matrix display
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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
1
2
3
4
5
6
7
8
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
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
9
10
11
12
13
14
base
8
V2.0 03/05
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