Owon AS Series User manual

AS Series Oscilloscopes
User Manual
www.owon.com.cn

July 2019 edition V1.0.1
Copyright © LILLIPUT Company.All rights reserved.
The LILLIPUT's products are under the protection of the patent rights, including ones which
have already obtained the patent rights and those which are applied for. The information in this
manual will replace all materials published.
The information in this manual was correct at the time of printing. However, LILLIPUT will
continue to improve products and reserves the rights to change specification at any time
without notice.
is the registered trademark of the LILLIPUT Company.
Fujian LILLIPUT Optoelectronics Technology Co., Ltd.
No. 19, Heming Road
Lantian Industrial Zone, Zhangzhou 363005 P.R. China
Tel: [phone] Fax: [phone]
Web: www.owon.com.cn E-mail: [e-mail]

General Warranty
OWON warrants that the product will be free from defects in materials and
workmanship for a period of 3 years from the date of purchase of the product by
the original purchaser from the OWON Company. The warranty period for
accessories such as probes is 12 months. This warranty only applies to the original
purchaser and is not transferable to a third party.
If the product proves defective during the warranty period, OWON will either repair
the defective product without charge for parts and labour, or will provide a
replacement in exchange for the defective product. Parts, modules and
replacement products used by OWON for warranty work may be new or
reconditioned like new. All replaced parts, modules and products become the
property of OWON.
In order to obtain service under this warranty, the customer must notify OWON of
the defect before the expiration of the warranty period. Customer shall be
responsible for packaging and shipping the defective product to OWON's
designated service centre, a copy of the customers proof of purchase is also
required.
This warranty shall not apply to any defect, failure or damage caused by improper
use or improper or inadequate maintenance and care. OWON shall not be
obligated to furnish service under this warranty a) to repair damage resulting from
attempts by personnel other than OWON representatives to install, repair or
service the product; b) to repair damage resulting from improper use or connection
to incompatible equipment; c) to repair any damage or malfunction caused by the
use of non-OWON supplies; or d) to service a product that has been modified or
integrated with other products when the effect of such modification or integration
increases the time or difficulty of servicing the product.
Please contact the nearest OWON's Sales and Service Offices for services.
For better after-sales service, please visit www.owon.com.cn and register the
purchased product online.
Excepting the after-sales services provided in this summary or the applicable warranty
statements, OWON will not offer any guarantee for maintenance definitely declared or
hinted, including but not limited to the implied guarantee for marketability and
special-purpose acceptability. OWON should not take any responsibilities for any
indirect, special or consequent damages.

i
Table of Contents
1. General Safety Requirements.........................................................................1
2. Safety Terms and Symbols .............................................................................2
3. User Guidebook ...............................................................................................4
Structure of the Oscilloscope ....................................................................................4
Front Panel ................................................................................................................................ 4
Rear Panel................................................................................................................................. 6
General Inspection......................................................................................................7
Basic Operation...........................................................................................................7
Probe Compensation..................................................................................................8
Set the Probe Attenuation Coefficient.......................................................................9
Use the Probe Safely...................................................................................................9
X-Y Mode....................................................................................................................10
4. Troubleshooting.............................................................................................12
5. Technical Specifications ...............................................................................13
General Technical Specifications ............................................................................14
6. Appendix.........................................................................................................15
Appendix A: Enclosure.............................................................................................15
Appendix B: General Care and Cleaning.................................................................15

1.General Safety Requirements
1
1. General Safety Requirements
Before use, please read the following safety precautions to avoid any
possible bodily injury and to prevent this product or any other connected
products from damage. In order to avoid any contingent danger, ensure this
product is only used within the range specified.
Only the qualified technicians can implement the maintenance.
To avoid Fire or Personal Injury:
Connect the probe correctly. The grounding end of the probe
corresponds to the grounding phase. Please don't connect the
grounding end to the positive phase.
Use Proper Power Cord. Use only the power cord supplied with the product
and certified to use in your country.
Connect or Disconnect Correctly. When the probe or test lead is connected
to a voltage source, please do not connect and disconnect the probe or test
lead at random.
Product Grounded. This instrument is grounded through the power cord
grounding conductor. To avoid electric shock, the grounding conductor must be
grounded. The product must be grounded properly before any connection with
its input or output terminal.
When powered by AC power, it is not allowed to measure AC power
source directly, because the testing ground and power cord ground
conductor are connected together, otherwise, it will cause short circuit.
Check all Terminal Ratings. To avoid fire or shock hazard, check all ratings
and markers of this product. Refer to the user's manual for more information
about ratings before connecting to the instrument.
Do not operate without covers. Do not operate the instrument with covers or
panels removed.
Use Proper Fuse. Use only the specified type and rating fuse for this
instrument.
Avoid exposed circuit. Do not touch exposed junctions and components
when the instrument is powered.
Do not operate if in any doubt. If you suspect damage occurs to the
instrument, have it inspected by qualified service personnel before further
operations.
Use your Oscilloscope in a well-ventilated area. Make sure the instrument
installed with proper ventilation, refer to the user manual for more details.
Do not operate in wet conditions.
Do not operate in an explosive atmosphere.
Keep product surfaces clean and dry.

2.Safety Terms and Symbols
2
2. Safety Terms and Symbols
Safety Terms
Terms in this manual. The following terms may appear in this manual:
Warning: Warning indicates the conditions or practices that could result
in injury or loss of life.
Caution: Caution indicates the conditions or practices that could result in
damage to this product or other property.
Terms on the product. The following terms may appear on this product:
Danger: It indicates an injury or hazard may immediately happen.
Warning: It indicates an injury or hazard may be accessible potentially.
Caution: It indicates a potential damage to the instrument or other property might
occur.
Safety Symbols
Symbols on the product. The following symbol may appear on the product:
Hazardous Voltage Refer to Manual
Protective Earth Terminal Chassis Ground
Test Ground

2.Safety Terms and Symbols
3
To avoid body damage and prevent product and connected equipment damage,
carefully read the following safety information before using the test tool. This
product can only be used in the specified applications.
Warning:
In X-Y mode, the X Input and Y Input of the oscilloscope are not electrically
isolated. The channels should adopt a common ground during measuring.
To prevent short circuits, the 2 probe grounds must not be connected to 2
different non-isolated DC levels.
The diagram of the oscilloscope ground wire connection:
Ground Clip
Signal Input
Oscilloscope Electrical Outlet
Probe
Power Cord
Warning:
To a
void fire or electrical shock, when the oscilloscope input
s
ignal connected is more than
42V peak (30Vrms) or on circuits of
more than 4800VA
, please take note of below items:
Only use accessory insulated voltage probes and test lead.
Check the accessories such as probe before use and
replace it if there are any damages.
Remove probes, test leads and other accessories
immediately after use.
Do not apply input voltages above the rating of the
instrument because the probe tip voltage will directly
transmit to the oscilloscope. Use with caution
when the
probe is set as 1:1.
Do not use exposed metal BNC or banana plug connectors.
Do not insert metal objects into connectors.

3.User Guidebook
4
3. User Guidebook
Structure of the Oscilloscope
This chapter makes a simple description of the operation and function of the front
panel of the oscilloscope, enabling you to be familiar with the use of the
oscilloscope in the shortest time.
Front Panel
1
2
4
3
6
9
18
17
11 10
7
5
16
14
13
8
15
19
12
Figure 3-1 Front panel
No.
Name
Description
1
Display screen
Display the trace.
2
Run/Stop
Enable or disable sampling on input signals.
3 Var (right side)
Provides continuously variable sweep rate. Turn
clockwise until the waveform does not change is the
calibration position.
4
◁▷
Position Horizontal positioning control of trace on the screen.

3.User Guidebook
5
5Level
Control signal trigger to sweep at certain level.
Towards "-
": The triggering level moves downward
on the display waveform.
Towards "+": The triggering level moves upward on
the display waveform.
6
Time/DIV
Select the sweep rate.
7Lock
When the Lock button is pressed down, the
triggering level is automatically maintained at
optimum value irrespective of the signal amplitude,
requiring no manual adjustment of triggering level.
8Norm/Auto/TV
Select the desired trigger mode.
Norm: No trace on screen if no signal. Trace is only
generated when adequate trigger signal is present.
Auto:
a single trace shown on screen even no
signal. Au
tomatically reverts to triggered sweep
operation when adequate triggered signal is present.
Needs to adjust the Level.
TV: Used to show TV signals.
9 X Input
When switching to XY mode, it’s X input terminal.
When switching the trigger source to Ext, it’s external
trigger input terminal.
10 Int/Line/Ext
Switch to select the Trigger Source.
Int: Select internal signal as trigger source signal.
Line: Select AC power line as trigger signal.
Ext: The external signal applied through X Input
terminal is used for the external triggering source
signal.
11 CAL signal
Provide calibration square wave for 0.5Vpp range,
frequency=1kHz. Used for adjusting probe
compensation
and adjusting the vertical & horizontal
sensitivity.
12 CAL ground Ground wire connector of the calibration signal.
13 AC/DC/
⊥
Switch for selecting coupling mode.
AC: Block the DC component of the input signal.
DC: Pass both AC and DC components of the input
signal.
⊥(GND): Disconnect the input signal.
14
Y Input
Vertical input terminal.

3.User Guidebook
6
15 +/-/XY
+: Trigger on rising slope. Triggering occurs when
the triggering signal cro
sses the triggering level in
positive-going direction.
-: Trigger on falling slope.
Triggering occurs when
the triggering signal crosses the
triggering level in
negative-going direction.
XY: This position is used when using the instrument
as an X-Y oscilloscope.
16
Volts/DIV Adjusting sensitivity of vertical system.
17
▽E
△
A
Position
Control vertical position of trace on the screen.
18 Var (left side)
Continuously adjusting the sensitivity of vertical
system. Turn clockwise until the waveform does not
change is the calibration position.
19
Power switch
Main power on/off.
Rear Panel
20
21
Figure 3-2 Rear Panel
No.
Name
Description

3.User Guidebook
7
20
AC Power input
connector Connect the supplied AC power cord to this connector.
21
Fuse holder
Fuse rating is 1A, T class, 250 V.
General Inspection
After you get a new oscilloscope, it is recommended that you should make a check
on the instrument according to the following steps:
1. Check whether there is any damage caused by transportation.
If it is found that the packaging carton or the foamed plastic protection cushion
has suffered serious damage, do not throw it away first till the complete device
and its accessories succeed in the electrical and mechanical property tests.
2. Check the Accessories
The supplied accessories have been already described in the "Appendix A:
Enclosure" of this Manual. You can check whether there is any loss of
accessories with reference to this description. If it is found that there is any
accessory lost or damaged, please get in touch with the distributor of OWON
responsible for this service or the OWON's local offices.
3. Check the Complete Instrument
If it is found that there is damage to the appearance of the instrument, or the
instrument can not work normally, or fails in the performance test, please get in
touch with the OWON's distributor responsible for this business or the
OWON's local offices. If there is damage to the instrument caused by the
transportation, please keep the package. With the transportation department
or the OWON's distributor responsible for this business informed about it, a
repairing or replacement of the instrument will be arranged by the OWON.
Basic Operation
1. Set the switches and controls on the front panel as shown below.
Position for control switches
Item
No. in Figure 3-1 Front panel
Setting
Power switch
19
○
pressed down
Volts/DIV
16
0.1 V
Norm/Auto/TV
8
Auto
Time/DIV
6
0.5 ms
+/-/XY
15
+
Int/Line/Ext
10
Int

3.User Guidebook
8
AC/DC/⊥
13
⊥
Lock
7
Pressed down
2. Connect the power cord to the AC line outlet. Press the power switch ○— on
the front panel to power on, the screen will light up. A few seconds later, a
trace will appear on the screen.
3. Align the trace with the horizontal center line of the graticule by adjusting the
AE▽E
△
APosition knob.
4. Connect the probe to the Y Input terminal and apply the 0.5 Vpp CALIBRATOR
signal to be probe tip.
5. Set the AC/DC/⊥switch to the AC state. A square waveform will be displayed
on the screen.
6. For signal viewing, set the Volts/DIV switch and Time/DIV switch in appropriate
positions so that signal waveform is displayed clearly.
7. Adjust the A
E▽E
△
APosition and ◁▷Position controls in appropriate positions so that
the displayed waveform is aligned with the graticule and voltage and period
can be read conveniently.
Probe Compensation
When connect the probe with the input channel for the first time, make this
adjustment to match the probe with the input channel. The probe which is not
compensated or presents a compensation deviation will result in the measuring
error or mistake. For adjusting the probe compensation, please carry out the
following steps:
1. Set the switch in the probe to 10X. (see "Set the Probe Attenuation Coefficient"
on P9).
2. Connect the probe BNC connector to the Y Input terminal. Connect the probe
tip to the calibration signal on the front panel (see 11 of Figure 3-1 Front panel).
Connect the reference wire clamp to the ground wire connector of the
calibration signal (see 12 of Figure 3-1 Front panel).
3. Check the displayed waveforms and regulate the probe till a correct
compensation is achieved (see Figure 3-3 and Figure 3-4).

3.User Guidebook
9
Compensated correctly Overcompensated Under compensated
Figure 3-3 Displayed Waveforms of the Probe Compensation
Figure 3-4 Adjust Probe
Set the Probe Attenuation Coefficient
The probe has several attenuation coefficients, which will influence the vertical
scale factor of the oscilloscope.
The set values of the probe switch are 1X and 10X (see Figure 3-5).
Figure 3-5 Attenuation Switch
Caution:
When the attenuation switch is se
t to 1X, the probe will limit the
bandwidth of the oscilloscope in 5MHz or 6MHz. To use the full
bandwidth of the oscilloscope, the switch must be set to 10X.
Use the Probe Safely
The safety guard ring around the probe body protects your finger against any
electric shock, shown as Figure 3-6.

3.User Guidebook
10
Figure 3-6 Finger Guard
Warning:
To avoid electric shock, always
keep your finger behind the safety
guard ring of the probe during the operation.
To protect you from suffering from the electric shock, do not touch any
metal part of the probe tip when it is connected to the power supply.
Before making any measurements, always
connect the probe to the
instrument and connect the ground terminal to the earth.
X-Y Mode
Examine the Phase Difference between Signals of two Channels
X-Y mode is a very useful when examining the Phase difference of two signals.
1. Set the +/-/XY control on the front panel to the XY position.
2. Set the switch in the probe to 1X or 10X, depend on your need (see "Set
the Probe Attenuation Coefficient" on P9).
3. Connect the probe of Y Input to the Y-axis signal (vertical axis signal).
Connect the probe of X Input to the X-axis signal (horizontal axis signal).
4. Turn the Volts/DIV knob to set the vertical scale of Y-axis signal. The
vertical scale of X-axis signal is fixed as 0.5V/DIV.
5. The vertical position is adjusted using the A
E▽E
△
APosition knob. The horizontal
position is adjusted using the ◁▷Position knob.
6. With the elliptical oscillogram method adopted, observe and calculate the
phase difference (see Figure 3-7).

3.User Guidebook
11
Figure 3-7 Lissajous Graph
Based on the expression sin (q) =A/B or C/D, thereinto, qis the phase
difference angle, and the definitions of A, B, C, and D are shown as the graph
above. As a result, the phase difference angle can be obtained, namely, q =±
arcsin (A/B) or ± arcsin (C/D). If the principal axis of the ellipse is in the I and
III quadrants, the determined phase difference angel should be in the I and IV
quadrants, that is, in the range of (0 - π /2) or (3π / 2 - 2π). If the principal axis
of the ellipse is in the II and IV quadrants, the determined phase difference
angle is in the II and III quadrants, that is, within the range of (π / 2 - π) or (π -
3π /2).
The signal must be
centered and kept in the
horizontal direction.

4.Troubleshooting
12
4. Troubleshooting
1. Oscilloscope is powered on but no Display.
Check whether the power connection is connected properly.
Check whether the fuse which is beside the AC power input jack is blew
(the cover can be pried open with a straight screwdriver).
Restart the instrument after completing the checks above.
If the problem persists, please contact OWON and we will be under your
service.
2. After acquiring the signal, the waveform of the signal is not displayed in
the screen.
Check whether the probe is properly connected to the signal connecting
wire.
Check whether the signal connecting wire is correctly connected to the
BNC (namely, the channel connector).
Check whether the probe is properly connected with the object to be
measured.
Check whether there is any signal generated from the object to be
measured (the trouble can be shot by the connection of the channel from
which there is a signal generated with the channel in fault).
Make the signal acquisition operation again.
3. The measured voltage amplitude value is 10 times or 1/10 of the actual
value.
Look at the attenuation ration of the probe (see "Set the Probe Attenuation
Coefficient" on P9).
4. There is a waveform displayed, but it is not stable.
Check whether the trigger source (Int/Line/Ext controls on the front panel)
is in conformity with the signal channel used in the practical application.
Press down the Lock button on the front panel.

5.Technical Specifications
13
5. Technical Specifications
Unless otherwise specified, the technical specifications applied are for
single-channel series only, and Probes attenuation set as 10X. Only if the
oscilloscope fulfills the following condition at first, these specification standards
can be reached.
This instrument should run for at least 30 minutes continuously under the
specified operating temperature.
All specification standards can be fulfilled, except one(s) marked with the word
"Typical".
Performance Characteristics
Instruction
Bandwidth AS101
DC
0 – 10 MHz
AC
10 Hz – 10 MHz
AS201
DC
0 – 20 MHz
AC
10 Hz – 20 MHz
Channel Q’nty
1
Acquisition
Run/Stop
supported
Sampling Rate
100M Sa/s
Input
Input Coupling
DC, AC, and ground
Input Impedance
1 MΩ ± 2%, in parallel with 20 pF±5 pF
Max. Input Voltage
400V (DC+AC, PK - PK)
Horizontal
System
Sampling Rate Range
0.5 Sa/s - 100 MSa/s
Interpolation
sin(x)/x
Scanning Speed (s/DIV)
0.05μs/DIV - 0.1s/DIV, step by 1 - 2 - 5
Sampling Rate / Relay
Time Accuracy
±100 ppm
Trimming Ratio
≥2.5:1
Vertical
system
Sensitivity
5 mV/DIV - 10 V/DIV
Displacement
±10 DIV
Analog Bandwidth
AS101
10 MHz
AS201
20 MHz
Low Frequency
≥10 Hz (at input, AC coupling, -3 dB)
Rise Time
(at input, typical)
≤ 30 ns
Trimming Ratio
≥2.5:1
X-Y Mode
Sensitivity
X: 0.5V/DIV, Y: 0.1V/DIV - 1V/DIV
Bandwidth (-3dB)
DC: 0 - 1MHz, AC: 10Hz - 1MHz
Trigger
Trigger Level Range
Internal
±4 DIV from the screen center
Trigger Level Accuracy
(typical)
Internal,
External
±0.3 DIV

5.Technical Specifications
14
Trigger Lock
supported
Edge Trigger
Slope
rising, falling
Video Trigger Modulation
supported standard: NTSC, PAL and
SECAM broadcast systems
Ext. Trigger Input Impedance
1 MΩ ± 2%, in parallel with 20 pF±5 pF
Ext. Trigger Max. Input Voltage
400 Vpp
Trigger Source
Int, Line, Ext
Trigger Mode
Norm, Auto, and TV
Output of the Probe Compensator
Output Voltage (typical) square, 0.5 Vpp ± 2%
Frequency (typical)
square wave of 1 kHz (±1%)
General Technical Specifications
Display
Display Type
3.7" LCD, TFT screen
Display Resolution
320 (horizontal) x 240 (vertical) pixels
Display Color
65536 colors
Power
Mains Voltage 100 - 240 VACRMS, 50/60 Hz, CAT II
Power Consumption
< 15 W
Fuse
1A, T class, 250 V
Environment
Temperature working temperature: (0 ℃)- (+40 ℃)
storage: (-20 ℃)- (+60 ℃)
Relative Humidity
≤ 90%
Height
operating: 3,000 m
non-operating: 15,000 m
Cooling Method
natural cooling
Mechanical Specifications
Dimension (D/H/W)
288 mm x 195 mm x 117 mm
Weight
Approx. 1.8 kg
Interval Period of Adjustment:
One year is recommended for the calibration interval period.

6.Appendix
15
6. Appendix
Appendix A: Enclosure
(The accessories subject to final delivery.)
Standard Accessories:
Power Cord
Quick Guide
Probe
Spare Fuse
Probe Adjust
Appendix B: General Care and Cleaning
General Care
Do not store or leave the instrument where the display will be exposed to direct
sunlight for long periods of time.
Caution: To avoid any damage to the instrument or probe, do not exposed it to
any sprays, liquids, or solvents.
Cleaning
Inspect the instrument and probes as often as operating conditions require.
To clean the instrument exterior, perform the following steps:
1. Wipe the dust from the instrument and probe surface with a soft cloth. Do
not make any scuffing on the transparent LCD protection screen when
clean the LCD screen.
2. Disconnect power before cleaning your Oscilloscope. Clean the instrument
with a wet soft cloth not dripping water. It is recommended to scrub with
soft detergent or fresh water. To avoid damage to the instrument or probe,
do not use any corrosive chemical cleaning agent.
Warning:
Before power on again for operation, it is required to confirm
that the instrument has already been dried completely,
avoiding any electrical short circuit or bodily in
jury resulting
from the moisture.