User Manual
Model 381295 and 381295-220
5MHz Dual Channel
True RMS Handheld Oscilloscope
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
FAX 781.665.0780 - TestEquipmentDepot.com
99 Washington Street
Melrose, MA 02176
Phone 781-665-1400
Toll Free 1-800-517-8431
Visit us at www.TestEquipmentDepot.com
Back to the Extech 381295 Product Page
381295 381295-220 V1.3 5/06
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Table of Contents
Introduction ........................................................................................ 3
Main Features .........................................................................................................3
Safety................................................................................................... 3
Safety Precautions..................................................................................................3
Safety Symbols .......................................................................................................3
Quick-Start Manual............................................................................. 4
Power on and off.....................................................................................................4
Division, Trigger and Function key..........................................................................4
Input Terminals........................................................................................................4
Command (F1-F4), Arrow, Backlight and Help key.................................................4
Primary Menu Map..................................................................................................5
Positioning the waveform on the screen.................................................................5
Division key map.....................................................................................................6
Changing Vertical (A/div or B/div) division..............................................................7
Changing Horizontal division...................................................................................7
Trigger key map ......................................................................................................8
Trigger level control.................................................................................................8
Function key map....................................................................................................9
Specifications................................................................................... 10
General Specifications ..........................................................................................10
Oscilloscope Function...........................................................................................11
Digital Multimeter Functions..................................................................................12
Product Description......................................................................... 14
LCD Area...............................................................................................................14
Keys Area..............................................................................................................15
T erminal Area........................................................................................................17
Operation .......................................................................................... 18
Powering the Meter...............................................................................................18
Changing Backlight...............................................................................................18
Making Selections in a Menu................................................................................18
Frequency measurements for CHA.......................................................................19
Freezing the screen ..............................................................................................19
Changing the Graphic Representation..................................................................20
Acquiring the Waveform........................................................................................21
Triggering on a Waveform.....................................................................................22
Setting Trigger level (on NORmal trigger mode)...................................................22
Making a single acquisition...................................................................................23
Setting Trigger mode (Tmode)..............................................................................23
Setting AUTO Trigger Level ..................................................................................24
Setting Normal Trigger mode................................................................................24
Setting Trigger Slope.............................................................................................25
Storing and Recalling Screens..............................................................................25
Storing Screen.......................................................................................................25
Recalling Screen...................................................................................................25
PC Interface and Datalogging Software......................................... 26
Maintaining the Meter ......................................................................29
Battery Replacement...........................................................................................259
Appendices....................................................................................... 31
Troubleshooting guide...........................................................................................31
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Introduction
Main Features
• Rechargeable batteries and AC Adaptor:
Model 381295 (120V, 60Hz)
Model 381295-220 (240V, 50Hz)
• RS-232C PC interface for viewing, saving, and printing measurement and
waveform data.
• Dual Channel operation plus Auto Calibration features.
• Automatic settings for horizontal and vertical divisions.
• DC to 5MHz bandwidth
• Built-in auto ranging True-RMS digital MultiMeter
• Auto ranging
• Data hold and run modes.
• Backlit display with Low battery indication.
• Display Type: Super-Twist 132 x 128 pixels.
• Designed to comply with safety standards: UL3111 and CSA C22.2 No.1010-1
Safety
Attention
Carefully read the following safety information before using this instrument.
Safety Precautions
Specific warning and caution statements, where they apply, will be found throughout the
manual.
A ‘Caution’ identifies conditions and actions that may damage the instrument. A
‘Warning’ identifies conditions and actions that pose hazard(s) to the user.
Symbols used on this instrument and in this manual are explained in the next table.
Warning
To avoid electrical shock, use only the supplied power supply.
See explanation in manual
Dangerous Voltage
Double Insulation (Protection Class)
Earth (Ground)
Either AC or DC
DC – Direct Current
AC – Alternating Current
Fuse
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Quick-Start
Power On and Off
1.Pressing and holding this button for 2 to 3
seconds will turn the unit on. Pressing this
button again will turn the power off.
Division, Trigger and Function key
1 Division key:
Adjusts vertical division or Horizontal
division.
2 Trigger key:
Adjusts Trigger level.
Selects Single shot mode.
Selects trigger setup.
3 Function key:
Selects Scope Setup.
Selects general setup.
Input Terminals
1 Channel A:
Always use the red channel A input for single
input measurements.
2 Channel B:
For measuring two signals, use Channel B with
Channel A.
3 Common:
Use the black common as signal ground for low frequency measurements and for
ACV, DCV, Ohm, and Continuity measurements.
4 External trigger:
The EXT.TRIG input accepts external trigger signals.
Command (F1-F4), Arrow, Backlight and Help key
1
Function Command keys:
F1 through F4 are command ‘soft’ keys.
Their functions change with each screen.
2 Four arrow keys:
These keys serve as the primary means
of navigating the instrument’s menus and
operating displays.
3 Help key:
General information for the meter is available with a press of this key.
4 Display back light:
Press this button to turn on the backlight. To turn the back light off, press this button
again.
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Quick-Start
Primary Menu Map
Default Menu
Division Menu
Trigger Menu
Function Menu
Positioning the Waveform on the Screen
1. Pressing
moves the waveform up.
2. Pressing
moves the waveform down.
3. Pressing
moves the waveform left.
4. Pressing
moves the waveform right.
¸
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
FAX 781.665.0780 - TestEquipmentDepot.com
381295 381295-220 V1.3 5/06
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Quick-Start
Division key map
1
Pressing DIV calls up the default division menu.
2 Press F2 to control the Channel B Vertical Division.
3 Press F3 to change the Horizontal Division.
4 Press F4 to exit.
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Quick-Start
Changing Vertical (A/div or B/div) division
1 Pressing increases
CHA vertical division
(A/div).
2 Pressing
decreases
CHA vertical division
(A/div).
3 Pressing
or will
change Div from
MANUAL to AUTO(
).
Changing Horizontal
division
1 Pressing increases
Horizontal division
(H/div).
2 Pressing
decreases Horizontal
division (H/div).
3 Pressing
or will
change Div from
MANUAL to AUTO(
).
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Quick-Start
Trigger key map
1
Press TRIG to
display the
TRIGGER
default menu.
2 Press F2 for
Single shot mode.
3 Press F3 for
TRIGGER
SETUP.
4 Press F4 to exit.
Trigger level control
1 Pressing
increases the
Trigger level.
2 Pressing
decreases the
Trigger level.
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Quick-Start
Function key map
1 Press FUNC to display the FUNCtion default menu.
2 Press F1 for SCOPE SETUP.
3 Press F2 for General SETUP. Press F4 to exit.
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Specifications
General Specifications
Operational Temperature: +32°F to +122°F (0°C to +50°C)
Operational Relative Humidity: < 75%
Storage conditions: -4°F to 140°F (-20°C to +60°C); < 75%RH
Temperature Coefficient: 0.1 x (Specified Accuracy) per °C for temperature
<64.4°F (18°C) to >82.4°F (28°C)
Max. Voltage Input and Ground: DC or AC 600Vrms
Basic DC Accuracy: 0.3%
Scope Bandwidth: 5 MHz
MultiMeter AC Bandwidth: 20 kHz
Power Supply: Ni-MH Battery 4.8V (1.2V x 4 cell)
Battery Life: 4 Hours with Backlight OFF, 3 Hours with Backlight
ON
Battery Charge Time: 3 Hours approx.
AC Adaptor/Charger: Class-2 transformer,
Input: 120V AC 60Hz (381295)
Input: 240V AC 50Hz, (381295-220)
Output: 9V DC 1A
Display Type: Super-Twist 132 x 128 pixels
Equipment Dimensions: 3.5” (90mm) width x 7.7” (195mm) depth x 1.6”
(40mm) height
Equipment Weight: 1.0 lbs
. (460g) approx.
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
FAX 781.665.0780 - TestEquipmentDepot.com
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