Text preview for : SDS Series Oscilloscopes Service_Manual_v1.2.pdf part of OWON SDS Series SDS Series
Smart Digital Storage Oscilloscopes
Service Manual
■ SDS6062(V)
■ SDS7102(V)
■ SDS8102(V)
■ SDS8202(V)
■ SDS8302
■ SDS9302
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SDS Series
Smart Digital Storage Oscilloscopes
Service Manual
SDS6062(V)
SDS7102(V)
SDS8102(V)
SDS8202(V)
SDS8302
SDS9302
Note: "V" for VGA interface (optional), SDS8302 and SDS9302
including VGA interface as default.
WWW.OWON.COM.HK
WWW.OWON.COM.CN
Jan. 2013 edition V1.2
Copy Right in this Manual © Lilliput Company. All rights Reserved.
The Lilliput's products are under the protection of the patent rights in America and other countries,
including ones which have already obtained the patent rights and those which are applying for.
The information in this manual will replace all that in the materials published originally.
The information in this manual was correct at the time of printing. However, OWON will continue
to improve products and reserves the rights to changes specification at any time without notice.
OWON is the registered trademark of the Lilliput Company.
Headquarter: Fujian Lilliput Optoelectronics Technology Co.,Ltd.: The mansion of
optoelectronics, 19 Heming Road, Lantian industrial zone, Zhangzhou, Fujian, China
Tel:+86-596-2130430 Fax:+86-596-2109272
Web: www.owon.com.hk Mail: Business Consulting: [email protected]
Sale service: [email protected]
Branch: Xiamen Lilliput Technology Co.,Ltd.: the 5th floor, B Area, Chuangxin Mansion,
Software Park, ZhenZhuWan, Huandao RD, Xiamen, Fujian, China
Tel:+86-592-2575666 Fax:+86-592-2575669
Web: www.owon.com.cn Mail: [email protected]
LIMITED WARRANTY & LIMITATION OF LIABILITY
Each Owon product is warranted to be free from defects in material and workmanship under
normal use and service. The warranty period of oscilloscope is three years and the warranty period
of accessories is one year, and begins on the date of shipment. Parts, product repairs and services
are warranted for 90 days. This warranty only apply to the original buyer or customers of a Owon
authorized dealer, and does not apply to fuses, disposable batteries or to any product which, in
Owon's opinion, has been misused, altered, neglected or damaged by accident or abnormal
conditions of operation or handling. Owon warrants that software will operate substantially in
accordance with its functional specifications for 90 days and that it has been properly recorded on
non-defective media. Owon does not warrant that software will be error free or operate without
interruption.
Owon authorized dealer shall extend this warranty on new and unused products to end-user
customers only but have no authority to extend a greater or different warranty on behalf of Owon.
Warranty support is available if product is purchased through an Owon authorized sales outlet or
Buyer has paid the applicable international price. Owon reserves the right to invoice Buyer for
importation costs of repair/replacement parts when product purchased in one country is submitted
for repair in another country.
Owon's warranty obligation is limited, at Owon's option, to refund of the purchase price, free of
charge repair, or replacement of a defective product which is returned to an Owon authorized
service center within the warranty period.
To obtain warranty service, contact your nearest Owon authorized service center or send the
product, with a description of the difficulty, postage and insurance prepaid (FOB Destination), to
the nearest Owon authorized service center. Owon assumes no risk for damage in transit.
Following warranty repair, the product will be returned to Buyer, transportation prepaid (FOB
Destination). If Owon determines that the failure was caused by misuse, alteration, accident or
abnormal condition of operation or handling, Owon will provide an estimate of repair costs and
obtain authorization before commencing the work. Following repair, the product will be returned
to the Buyer transportation prepaid and the Buyer will be billed for the repair and return
transportation charges (FOB Shipping Point).
This warranty is Buyer's sole and exclusive remedy and is in lieu of all other warranties, express
or implied, including but not limited to any implied warranty of merchantability or fitness for a
particular purpose. Owon shall not be liable for any special, indirect, incidental or consequential
damages or losses, including loss of data, whether arising from breach of warranty or based on
contract, tort reliance or any other theory.
Since some countries or states do not allow limitation of the term of an implied warranty, or
exclusion or limitation of incidental or consequential damages, the limitations and exclusions of
this warranty may not apply to every buyer. If any provision of this Warranty is held invalid or
unenforceable by a court of competent jurisdiction, such holding will not affect the validity or
enforceability of any other provision.
SERVICES CENTER
To locate an authorized services center, visit us on the World Wide Web:
www.owon.com.hk
Table of Contents
List of Figures ...................................................................................................................................ii
List of Tables.....................................................................................................................................ii
General Safety Summary ................................................................................................................ iii
Section 1: General Information.........................................................................................................1
1.1 Introduction.........................................................................................................................1
1.2 Accessories Supplied...........................................................................................................1
1.3 Technical Specifications......................................................................................................1
1.4 General Technical Specifications ........................................................................................7
1.5 Declaration of Conformity ..................................................................................................8
Section 2: Installation........................................................................................................................9
2.1 Performing the General Inspection .....................................................................................9
2.2 Operating Environment.......................................................................................................9
2.3 Storage and Transport .........................................................................................................9
2.4 Packaging ..........................................................................................................................10
2.5 Tagging for Service ...........................................................................................................10
2.6 Power Supply Requirement...............................................................................................10
2.7 Cleaning Requirements .....................................................................................................10
Section 3: Test and Calibration ....................................................................................................... 11
3.1 Equipment for Testing....................................................................................................... 11
3.2 Test Standard ..................................................................................................................... 11
3.3 Inspection Items and Methods........................................................................................... 11
Section 4: Debugging and Calibration ............................................................................................18
4.1 Brief Introduction..............................................................................................................18
4.2 Tools and Devices .............................................................................................................18
4.3 The Interval Time to Calibration.......................................................................................18
4.4 Auto-calibration ................................................................................................................18
4.5 Attenuation Compensation Capacitance and Resistance Calibration ................................18
Section 5: Maintenance...................................................................................................................22
5.1 Brief Introduction..............................................................................................................22
5.2 Preparation and Safety Event ............................................................................................22
5.3 Circuit Diagram.................................................................................................................22
5.4 Removal and Installation Procedures................................................................................24
5.6 Examination and Maintenance ..........................................................................................34
Section 6: Replaceable Parts ...........................................................................................................36
6.1 Replaceable Parts List .......................................................................................................36
6.2 Order Information .............................................................................................................36
i
List of Figures
Figure 1: Connection of sweep rate and error inspection .....................................12
Figure 2: Waveform of sweep rate and error inspection .......................................12
Figure 3: Connection of voltage division and error inspection.............................13
Figure 4: Connection of voltage measurement and error inspection ....................13
Figure 5: Connection of transient response inspection .........................................14
Figure 6: Waveform of transient response inspection...........................................14
Figure 7: Connection of vertical movement range inspection ..............................15
Figure 8: Connection of input impedance inspection ...........................................16
Figure 9: Connection of maximum input voltage testing .....................................16
Figure 10: Attenuation Switch ..............................................................................19
Figure 11: Connection of calibrating the probe in the CH1..................................19
Figure 12: Displayed Waveforms of the Probe Compensation.............................19
Figure 13: Adjust Probe ........................................................................................19
Figure 14: The position of the attenuation compensation capacitance .................20
Figure 15: The position of the attenuation compensation resistance ....................21
Figure 16: SDS series block diagram....................................................................22
Figure 17: The schematic circuit diagram of the power supply............................24
Figure 18: Loosen the screws of battery box ........................................................24
Figure 19: Remove the battery box cover.............................................................24
Figure 20: Remove the Ground Connection .........................................................25
Figure 21: Remove the screws of rear panel.........................................................26
Figure 22: Unsnap the rear panel (1) ....................................................................26
Figure 23: Unsnap the rear panel (2) ....................................................................26
Figure 24: Disconnect the rear panel and Remove the battery box container ......27
Figure 25: Remove power supply board...............................................................27
Figure 26: Screws and cables of the adapter plate................................................28
Figure 27: Remove the adapter plate ....................................................................28
Figure 28: Remove the chassis .............................................................................29
Figure 29: Fan power cable of the chassis ............................................................29
Figure 30: Install the chassis (1) ...........................................................................30
Figure 31: Install the chassis (2) ...........................................................................30
Figure 32: Screws secure the fan ..........................................................................31
Figure 33: Screws secure the main board .............................................................31
Figure 34: Remove the main board.......................................................................32
Figure 35: Troubleshooting procedure (1) ............................................................34
Figure 36: Troubleshooting procedure (2) ............................................................35
List of Tables
Table 1: Specifications ............................................................................................2
Table 2: General specifications ...............................................................................7
Table 3: Environment..............................................................................................9
Table 4: Replaceable parts list ..............................................................................36
ii
General Safety Summary
General Safety Summary
Operation security
Read the security information carefully before use.
Safety Terms and Symbols
Specific Warning and Caution Terms that Appear throughout the Manual
Warning: "Warning" identifies conditions and actions that pose hazards to the users.
Caution: "Caution" identifies conditions and actions that may damage the product or
other properties.
Terms Used on the Product
The following terms appears possibly on the product:
Danger: The term "Danger" is used in this manual to indicate that when you read this
mark, personal injury may be caused to you immediately.
Warning: The term "Warning" is used in this manual to indicate that when you read this
mark, personal injury may not be caused to you immediately, but you need to
be cautionary.
Notice: The term "Notice" is used in this manual to indicate that damages may be
caused on this product or other properties.
Symbols Used on the Product
The following symbols appear possibly on the product.
High voltage Refer to user Protective Measurement Earth (ground)
manual ground ground Terminal
iii
General Safety Summary
Safety Requirement
Carefully read the following safety information in order to avoid any personal injury and damage
on this product or any products connected with it. This product can only be used in the specified
applications to prevent any possible dangers.
Only qualified technical personnel are permitted to perform maintenance.
Prevent fires and personal injuries.
Use professional power wire. Only use the special power wire that is applied to the user
state.
Connect and cut off in the proper way. Please do not connect or cut off the probe or the
tested wires voluntarily when connecting with the power supply.
Grounding. Make sure the product is earthed properly by grounding conductor before
connecting with the input or output terminal that is to avoid electric shock.
Use the probe in a proper way. The grounding terminal of the probe is earth potential.
Pay attention to the nominal values of all terminals: To avoid fire or electric shock, please
keep a watchful eye on all nominal values and marks specified for this product. Before any
connection performed on this product, carefully read the user's manual of the product for
further information of nominal values.
No operation is allowed without the instrument cover plate: If the cover plate or panel has
been removed, do not perform any operation on this product.
Use the standard fuse conformed to the product with the rating value.
No touch is allowed on bare conductors: When the product is powered on, do not touch any
bare joints or parts of the scope meter.
Operation is prohibited in case of any undetermined failure: When in doubt any damage
on this product, consult the qualified personnel for checking on it.
Keep ventilation in good condition: Read the user manual for detail installation instructions
in order to fix this product correctly and provide it with good ventilation conditions.
No operation is allowed under a humid environment.
No operation is allowed under an explosive environment.
Keep clean and dry on the product surface.
iv
General Safety Summary
To avoid body damage and prevent product and connected equipment damage. This
product can only be used in the specified applications. Carefully read the following
safety information before using the test tool.
Warning:
To avoid fire or electrical shock if a test tool input is connected to more 42V peak (30Vrms)
or on circuits of more than 4800VA:
Use only insulated voltage probes, test leads and adapter supplied with the test tool, or
indicated by OWON as suitable for the Oscilloscope & Multimeter.
Before use, inspect voltage probes, test leads and accessories for mechanical damage and
replace when damaged.
Remove all probes, test leads and accessories that are not in use.
Remove all the PC communication connection.
Do not apply input voltages above the rating of the instrument. Please be careful when
using 1:1 test leads because the probe tip voltage will be directly transmitted to the
Oscilloscope & Multimeter.
Do not use exposed metal BNC or banana plug connectors.
Do not insert metal objects into connectors.
v
Section 1: General Information
Section 1: General Information
1.1 Introduction
This service manual contains information on adjusting and servicing the SDS Series
Oscilloscope.
Chapter General Information simply introduces the specifications of the oscilloscope.
Chapter Installation introduces the theory of installing.
Chapter Test and Calibration simply introduces some theory and method of tests.
Chapter Debugging and Calibration supplies some modules for adjust and some
methods.
Chapter Maintenance mainly supplies some parts to customers for service
Chapter Replaceable Parts mainly introduces theories and methods of servicing.
1.2 Accessories Supplied
Standard Accessories:
2 Passive probe: 1.2 m, 1:1 (10:1)
CD: x 1 (PC link application software)
Power cord: 1pcs, up to the standards of the country in which it is used.
USB cable
User Manual: 1pcs
Options:
Battery
1.3 Technical Specifications
Unless otherwise specified, the technical specifications applied are applicable to
the probe with the attenuation switch setting 10X and the SDS series digital
oscilloscope. Only if the oscilloscope fulfill the following two conditions at first,
can these specification standards be reached.
This instrument should run for more than 30 minutes continuously under the
specified operating temperature.
If the change range of the operating temperature is up to or exceeds 5,
open the system function menu and execute the "Auto-calibration" procedure
(see "4.4 Auto-calibration" on P18).
All specification standards can be fulfilled, except one(s) marked with the word
"Typical".
1
Section 1: General Information
Table 1: Specifications (cont.)
Performance Characteristics Instruction
SDS6062(V) 60MHz
SDS7102(V) 100MHz
SDS8102(V) 100MHz
Bandwidth
SDS8202(V) 200MHz
SDS8302 300MHz
SDS9302 300MHz
Channel 2 + 1 (External)
Mode Normal, Peak detect, Averaging
Sample rate Dual CH 250MS/s
SDS6062(V)
(real time) Single CH 500MS/s
Dual CH 500MS/s
SDS7102(V)
Single CH 1GS/s
Dual CH 1GS/s
SDS8102(V)
Acquisition Single CH 2GS/s
Dual CH 1GS/s
SDS8202(V)
Single CH 2GS/s
Dual CH 1.25GS/s
SDS8302
Single CH 2.5GS/s
Dual CH 1.6GS/s
SDS9302
Single CH 3.2GS/s
Input coupling DC, AC , Ground
Input impedance 1M±2%, in parallel with 10pF±5pF
Probe attenuation
1X, 10X, 100X, 1000X
factor
Max. input voltage 400V (PK-PK) (DC + AC PK-PK)
Input 20MHz, full bandwidth
Bandwidth limit
(not including SDS6062(V) )
Channel channel
50Hz: 100 : 1
isolation 10MHz: 40 : 1
Time delay between
150ps
channel(typical)
Horizontal Sampling rate range Dual CH 0.5S/s~250MS/s
SDS6062(V)
System Single CH 0.5S/s~500MS/s
Dual CH 0.5S/s~500MS/s
SDS7102(V)
Single CH 0.5S/s~1GS/s
Dual CH 0.5S/s~1GS/s
SDS8102(V)
Single CH 0.5S/s~2GS/s
Dual CH 0.5S/s~1GS/s
SDS8202(V)
Single CH 0.5S/s~2GS/s
Dual CH 0.5S/s~1.25GS/s
SDS8302
Single CH 0.5S/s~2.5GS/s
2
Section 1: General Information
Table 1: Specifications (cont.)
Performance Characteristics Instruction
Dual CH 0.5S/s~1.6GS/s
SDS9302
Single CH 0.5S/s~3.2GS/s
Interpolation (sin x)/x
Dual CH Max 10M
SDS6062(V)
Single CH sampling rate
Dual CH Max 10M
SDS7102(V)
Single CH sampling rate
500MS/s 10M
Dual CH
1GS/s 10K
SDS8102(V)
1GS/s 10M
Single CH
2GS/s 10K
500MS/s 10M
Dual CH
1GS/s 10K
SDS8202(V)
1GS/s 10M
Single CH
Max Record length 2GS/s 10K
500MS/s 10M
Dual CH 1GS/s
10K
1.25GS/s
SDS8302
1GS/s 10M
Single CH 2GS/s
10K
2.5GS/s
400MS/s 10M
Dual CH 800MS/s
10K
1.6GS/s
SDS9302
800MS/s 10M
Single CH 1.6GS/s
10K
3.2GS/s
Scanning speed 5ns/div100s/div,
SDS6062(V)
(S/div) step by 125
2ns/div100s/div,
SDS7102(V)
step by 125
2ns/div100s/div,
SDS8102(V)
step by 125
1ns/div100s/div,
SDS8202(V)
step by 125
3
Section 1: General Information
Table 1: Specifications (cont.)
Performance Characteristics Instruction
1ns/div100s/div,
SDS8302
step by 125
1ns/div100s/div,
SDS9302
step by 125
Sampling rate /
±100ppm
relay time accuracy
Single
Interval(T)
±(1 interval time+100ppm×reading+0.6ns);
accuracy
Average>16
(DC100MHz)
±(1 interval time +100ppm×reading+0.4ns)
A/D converter 8 bits resolution (2 Channels simultaneously)
Sensitivity 2mV/div~10V/div
SDS6062(V) ±10 div
SDS7102(V) ±1V(2mV100mV)
Displacement SDS8102(V)
SDS8202(V) ±10V(200mV1V)
SDS8302 ±100V(2V10V)
SDS9302
Analog bandwidth 60MHz, 100MHz, 200MHz, 300MHz
Single bandwidth Full bandwidth
Low Frequency 5Hz (at input, AC coupling, -3dB)
Vertical system
SDS6062(V) 5.8ns (at input, Typical)
SDS7102(V) 3.5ns (at input, Typical)
SDS8102(V) 3.5ns (at input, Typical)
Rise time
SDS8202(V) 1.7ns (at input, Typical)
SDS8302 1.17ns (at input, Typical)
SDS9302 1.17ns (at input, Typical)
DC accuracy ±3%
DC accuracy
Average16: ±(3% rdg + 0.05 div) for V
(average)
Measurement Cursor V and T between cursors
4
Section 1: General Information
Table 1: Specifications (cont.)
Performance Characteristics Instruction
Vpp, Vmax, Vmin, Vtop, Vbase, Vamp, Vavg,
Vrms, Overshoot, Preshoot, Freq, Period, Rise
Automatic
Time, Fall Time, Delay AB , Delay
AB , +Width, -Width, +Duty, -Duty
Waveform Math , , *, / ,FFT
Waveform storage 15 waveforms
Bandw
Full bandwidth
idth
Lissajous
Phase
figure
differe ±3 degrees
nce
Frequency ( typical) 1KHz square wave
USB2.0, USB for file storage; LAN port;
Communication VGA interface (only for the model with "V" or the models including VGA
port
interface as default) or RS-232 (Optional);
5
Section 1: General Information
Table 1: Specifications (cont.)
Trigger:
Performance Characteristics Instruction
Internal ±6 div from the screen center
Trigger level range EXT ±600mV
EXT/5 ±3V
Internal ±0.3div
Trigger level
EXT ±(40mV + 6% of Set Value)
Accuracy (typical)
EXT/5 ±(200mV +6% of Set Value)
Trigger
According to Record length and time base
displacement
Trigger Holdoff
100ns~10s
range
50% level setting
Input signal frequency 50Hz
(typical)
Edge trigger slope Rising, Falling
Sensitivity 0.3div
Positive pulse, ,
Pulse trigger Trigger condition
negative pulse, ,
Pulse Width range 30ns10s
Support standard NTSC, PAL and SECAM
Modulation
broadcast systems
Video Trigger
Line number range 1-525 (NTSC) and 1-625 (PAL/SECAM)
Positive pulse, ,
Trigger condition
Slope Trigger negative pulse, ,
Time setting 24ns10s
Trigger on CH1 Edge, Pulse, Video, Slope
Alternate Trigger
Trigger on CH2 Edge, Pulse, Video, Slope
6
Section 1: General Information
1.4 General Technical Specifications
Table 2: General specifications
Display
Display Type 8" Colored LCD (Liquid Crystal Display)
Display Resolution 800 (Horizontal) × 600 (Vertical) Pixels
Display Colors 65536 colors, TFT screen
Output of the Probe Compensator
Output Voltage
About 5V, with the Peak-to-Peak voltage 1M.
(Typical )
Frequency (Typical ) Square wave of 1KHz
Power
Mains Voltage 100240 VAC RMS, 50/60Hz, CAT II
< 18W---SDS6062(V)
Power Consumption
< 24W---other models
Fuse 2A, T grade, 250V
Cell:558792 4000mAh/3.7V
Battery (optional)
Pack:2s2p 7.4V/8000mAh
Mechanical Specifications
Dimension 340mm× 155mm×70mm (L*H*W)
Weight About 1.82 kilogram
Interval Period of Adjustment:
One year is recommended for the calibration interval period.
7
Section 1: General Information
1.5 Declaration of Conformity
SDS Series Smart Digital Storage Oscilloscopes
Manufacturer: Fujian Lilliput Optoelectronics Technology Co., Ltd.
Statement of Conformity
Base on the result using appropriate standards, the product is in conformity with
Electromagnetic Compatibility Directive 2004/108/EC Annex
Low Voltage Directive: 2006/95/EC
Sample tests
Standards used:
EN61010-12001
Safety Requirements for Electrical Equipment for Measurement, Control, and
Laboratory use-part 1: General Requirements
EN61326-1: 2006
Electrical Equipment for Measurement, Control and Laboratory use-EMC
Requirements-part 1. General Requirements
EN61000-3-2: 2006+A22009
Electromagnetic Compatibility (EMC)-part 3: Limits-Section 2: Limits for Harmonic
Current Emissions (Equipment Input Current less than/equal to 16A per phase)
EN61000-3-32008
Electromagnetic Compatibility (EMC)-part 3: Limits-Section 3 Limitation of Voltage
Fluctuations and Flicker in Low-Voltage Supply systems for Equipment with Rated
Current less than or equal to 16A
The tests have been performed in typical configuration.
This conformity is indicated by the symbol CE, i.e."Conformite Europeenne".
8
Section 2: Installation
Section 2: Installation
2.1 Performing the General Inspection
When you have got a new SDS oscilloscope, it is suggested that you should perform a general
inspection on the instrument according to the following steps.
2.1.1 Check whether there is any Damage on it Due to Transportation
If the packing boxes or foam cushions are found in serous damage, keep them in a proper place till
the complete instrument and accessories have passed the electrical and mechanical tests.
2.1.2 Make a Check on Accessories
The accessory list has been described in the picture of Digital Oscilloscope Parts of this manual.
You can make a check and find whether there is any accessory loss with reference to the Appendix.
In case of any accessory loss or damage, consult the OWON dealer responsible for such a business
or the local office of OWON.
2.1.3 Make a Check on the Complete Instrument
If the instrument is damaged in its appearance or it fails in normal operation or performance test,
consult the OWON dealer responsible for such a business or the local office of OWON. If the
instrument is damaged due to transportation, keep the packing in a proper place and consult the
transportation department and the OWON dealer responsible for such business, who will provide
an instrument replacement or maintenance
2.2 Operating Environment
Table 3: Environment
Working temperature: 0 40
Temperature
Storage temperature: -20 60
Relative Humidity 90%
Operating: 3,000 m
Height
Non-operating: 15,000 m
Cooling Method Natural convection
2.3 Storage and Transport
Do not store or place the instrument in locations where the liquid crystal display (LCD) may be
directly exposed to the sunshine for a long time.
Be careful: Do not make spraying agent, liquid and solvent touch with probes to avoid the
instrument or probe being damaged.
If the oscilloscope is to be stored for a long time, it is required to charge the lithium battery before
storage.
Take and put gently and prevent rain in the process of transportation.
9
Section 2: Installation
2.4 Packaging
Packaging: default packaging.
Other packaging methods:
A) Wraps with pasteboard or thick plastic.
B) With the intensity big packing case. (Made with such as double-decked cartoon paper)
C) Wraps with 70mm - 100mm sacrificially all around the instrument for quakeproof.
D) Place "the danger" on the packaging.
If the box or blister package has been damaged seriously, please keep it until the instrument and
all the accessories are passed your test.
2.5 Tagging for Service
The tagging is the certificate for the customer to require servicing. So please do not arbitrary tears
and modifies it.
2.6 Power Supply Requirement
Use only the power cord specified for this product and certified for the country of use. Make sure
that the product is properly be grounded.
2.7 Cleaning Requirements
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. Clean the instrument with a wet soft cloth not dripping water, during the
period of which please pay attention to the disconnection of power. 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 injury resulting form the moisture.
10
Section 3: Test and Calibration
Section 3: Test and Calibration
3.1 Equipment for Testing
Oscilloscope calibrator, signal generator, oscilloscope, LCR digital electric bridge, multi meter
calibrator
3.2 Test Standard
Q/ZLLD03-2005 enterprise standard and technical specification of SDS oscilloscopes by Fujian
Lilliput Optoelectronics Technology Co., Ltd
3.3 Inspection Items and Methods
3.3.1 Appearance and functional inspection
A. Appearance inspection
The appearance of the oscilloscope should be clean without obvious row a scar and deformation.
The juncture of the front cover and the back cover should be matched, seamless. The screws are
all fixed without loose. And the keyboards are flexible and light when pressing.
B. Functional inspection
First, power up the oscilloscope and come into measurement. Second, check all the keys and input
1KHz calibrating signals then press "Autoset", the oscilloscope should display waveforms and
work for measurement. Third, switch to the multi meter to check whether it could work normally.
3.3.2 Sweep rate and error inspection
A. As shown by Figure 1 connected, the CH1 set as follows:
Coupling: DC Channel: On Probe: 1X Invert: Off
Tested oscilloscope
Oscilloscope calibration
Output time scale
CH1-BNC
Q9 connection
11
Section 3: Test and Calibration
Figure 1: Connection of sweep rate and error inspection
B. Make the time scale of the oscilloscope calibrating in line with sweep rate (time division) and
adjust the trigger level to display stable waveforms. And press "T ERROR", turn fine-tuning knob
to make the time scale superpose with the level of calibration line( as Figure 2),the error is the
error value of sweep rate.( S03A calibration is pointer header that the indicated value is the
correction to the error of sweep rate and the error should be anti-symbol.)
Figure 2: Waveform of sweep rate and error inspection
C. Repeat step B and test sweep rate for other channels.
3.3.3 Time measurement and error inspection
A. As shown by Figure 1 connected
B. Set the output time period of the calibration as A, press "Autoset" to display the stable
waveform. Then, also set the measured window 1 as the period of CH 1; get the period value B to
gain the time error C as follows:
C=BA÷A×100%
3.3.4 Voltage division and error inspection
A. As shown by Figure 3 connected, CH 1 set as follows:
Coupling: DC Channel: On Probe: 1X Invert: Off
12
Section 3: Test and Calibration
Tested oscilloscope
Oscilloscope calibration
Output square scale
CH1-BNC
Q9 connection
Figure 3: Connection of voltage division and error inspection
B. Make the calibration to output the impulse 1KHz and change base output amplitude and voltage
scaling factor, the height of the waveform displayed takes 80% of the checked work spare in the
oscilloscope screen (usually 6 grids). Pressing "V ERROR" and adjust the fine-tuning knob until
the upper and lower base line and horizontal scale full of coincidence, the error displayed on the
calibration is the error of the voltage division. (S03A oscilloscope is pointer header that the
indicated value is the correct value of the error of sweep rate, base error is anti-symbol.)
C. Repeat step B and test voltage division for each channel.
3.3.5 Voltage measurement and error inspection
A. As shown by Figure 3.connected:
B: Make the calibration to output amplitude A of square wave 1 KHz, press "Autoset" and adjust
to display the stable waveforms. Set the measured window 1 as the peak-peak value of Channel 1
and read the period value B, then get the voltage measurement error C as follows:
C=BA÷A×100%
C. Repeat step B and check voltage measurement error for every channel.
3.3.6 Bandwidth inspection
A. As shown by Figure 4 connected:
Tested oscilloscope
Signal generator
Output sine wave
CH1-BNC
Q9 connection
Figure 4: Connection of voltage measurement and error inspection
B. Regulate the signal generator to output continuous sine wave, adjust output voltage and
13
Section 3: Test and Calibration
frequency to make the display amplitude at base standard frequency 80% of the checked spare on
the screen (usually 6 grids), and record the peak-peak value, increase the output frequency of
signal generator until the peak-peak value to 0.707 HO that the frequency is the actual value of
bandwidth.
C. Repeat step B and test bandwidth for every channel.
3.3.7 Transient response inspection
A. As shown by Figure 5 connected:
Tested oscilloscope
Oscilloscope calibration
Output faster edge
CH1-BNC
Q9 connection
Figure 5: Connection of transient response inspection
B. Set the period of the faster edge pulse as 1uS, adjust its output amplitude to make the waveform
take up about 80% spare of the checked working amplitude on the screen (usually 6 grids), and
regulate the zero point position to make the 0% of amplitude A and the 100% of amplitude A align
with the level of calibration line respectively, then also adjust the time base and trigger level to
make the mid-point waveform on the center screen. Shown as Figure 6:
Figure 6: Waveform of transient response inspection
Measure the time t from 10% of amplitude to 90% by cursor time that is rise time and measure the
rise-up range B by cursor voltage and get the rise-up value as follows:
Rise-up value SB÷A×100%
14
Section 3: Test and Calibration
C. Repeat step B and check the other channel.
3.3.8 Vertical movement range inspection
A. As shown by Figure 7 connected.
Tested oscilloscope
Oscilloscope calibration
Voltage output
CH1-BNC
Q9 connection
Figure 7: Connection of vertical movement range inspection
B. Regulate the calibration to output some positive voltage and change the lower limit of zero
position, the oscilloscope will display a straight line. Regulate the calibration to output negative
voltage and change the upper limit of zero position, the oscilloscope will display a straight line.
The range between the lower limit and the upper limit is the vertical movement range.
C. Repeat step B and test the vertical movement range of voltage division for every channel.
3.3.9 Linear error inspection for vertical movement
A. As shown by Figure 4 connected. The CH1 is set as follows:
Coupling: AC Channel: On Probe: 1X Invert: Off
Time base division: 1ms Measured window 1: Peak-peak value of CH1
B. Make the signal generator output 1KHz of sine wave and adjust output voltage until the
displayed amplitude 50% center of the checked working spare, record the peak-peak value A of
measured window 1, then adjust the zero position and record the corresponding peak-peak value B
and C of measured window 1 that the top and the bottom of the waveform takes up the upper limit
and the lower limit of checked working spare respectively, the linear error are as follows which is
the relatively large value:
BA÷A×100% andCA÷A×100%
C. Repeat step B and inspect linear error for vertical movement of every channel.
3.3.10 Input impedance inspection
A. As shown by Figure 8 connected:
15
Section 3: Test and Calibration
Tested oscilloscope
LCR tester
CH1-BNC
Q9 connection
Figure 8: Connection of input impedance inspection
B. The inspected oscilloscope comes into work and record resistance and capacitance of the input
end and measure every voltage division separately.
C. Repeat step B and test the other channel.
3.3.11 Drift test
Turn the voltage of CH1 and CH2 at 5mV, time base at 1mS; record the drift value of zero
position at the set time.
3.3.12 Noise testing
Turn the voltage of CH1 and CH2 at 5mV, time base at 1mS; record the max displayed amplitude,
which is the open-circuit noise.
3.3.13 Maximum input voltage testing
A. As shown by Figure 9 connected:
Tested oscilloscope
Voltage Source
CH1-BNC
Q9 connection
Figure 9: Connection of maximum input voltage testing
B. Turn on the unit, set the input coupling as DC and zero position at the center. Then adjust the
output voltage to be in accordance with the set value in product standard. Input voltage and last for
one minute and then cut off input voltage, the unit should work normally.
3.3.14 Average function testing
A. As shown by Figure 3 connected.
B. Make the calibration to output 30mV of the square wave and voltage division at 5mV, and the
sampling is the average sampling with different average numbers to observe the different
16
Section 3: Test and Calibration
smoothing.
C. Repeat step B and test for CH2.
3.3.15 Peak value testing inspection
A. As shown by Figure 4 connected.
B. The generator will be set to output 600mV/15nS of the impulse wave and the sampling mode
set as peak detection, voltage division at 200mV.Then try the different time base division and
observe the impulse wave on the screen.
C. Repeat step B and test the CH2.
3.3.16 Triggering test
A. As shown by Figure 4 connected.
B. Triggering sensitivity test: Turn the voltage division at 200mV and adjust the output frequency
of the signal generator as technical requirement until the oscilloscope could locate the waveform
stable with stepping up the output amplitude, therefore the voltage amplitude is the triggering
sensitivity.
C. Test for the range of triggering level: Adjust the output amplitude of the signal generator as
technical requirement and the triggering level position and record the range of triggering position
that could locate the waveform. The range is the range of triggering level.
D. Coupling mode test: The coupling mode will be setup as DC, AC, HF reject, LF reject, and
adjust the output amplitude of the signal generator and then observe whether the oscilloscope can
trigger.
17
Section 4: Debugging and Calibration
Section 4: Debugging and Calibration
4.1 Brief Introduction
In this part will provide some methods for debugging and calibration.
4.2 Tools and Devices
The instruments for debugging and calibration are in accordance with provided in section three.
4.3 The Interval Time to Calibration.
The recommended time for calibration is one year.
4.4 Auto-calibration
The auto-calibration application can make the oscilloscope reach the optimum condition
rapidly to obtain the most accurate measurement value. You can carry out this application
program at any time, but when the range of variation of the ambient temperature is up to or
over 5, this program must be executed.
For the performing of the self-calibration, all probes or wires should be disconnected with the
input connector first. Press the "Utility" button, then, press H1 button to call out the
Function menu; turn the M knob to choose Adjust. Press H2 button to choose the option
"Self Cal"; run the program after everything is ready.
4.5 Attenuation Compensation Capacitance and
Resistance Calibration
The steps are as follows:
1. Calibrate the probe in the CH1:
(1) Press the CH1 MENU button on the front panel of the oscilloscope, in the function
menu, set "Coupling" to DC, set "Probe" attenuation coefficient to X1.
(2) Set the attenuation switch of the probe as X1 (see Figure 10). If a probe hook tip is used,
ensure that it keeps in close touch with the probe.
(3) Connect the probe with the CH1, connect the probe tip with the 5V/1KHz signal
connector of the probe compensator and connect the reference wire clamp with the
ground wire connector of the probe connector (see Figure 11).
(4) Press the button "Autoset" of the oscilloscope. Check the displayed waveforms; if the
waveform does not appear like the Correctly Compensated waveform shown in Figure
12, adjust the probe (see Figure 13) for the flattest square wave possible.
18
Section 4: Debugging and Calibration
Figure 10: Attenuation Switch
Figure 11: Connection of calibrating the probe in the CH1
Over Compensated Correctly Compensated Under Compensated
Figure 12: Displayed Waveforms of the Probe Compensation
Figure 13: Adjust Probe
19
Section 4: Debugging and Calibration
2. Calibrate the attenuation compensation capacitance of the CH1:
Set the Vertical scale of CH1 to 10V; adjust the C25 adjustable capacitance until the
Correctly Compensated waveform is achieved. Set the Vertical scale of CH1 to 20V; adjust
the C24 adjustable capacitance until the Correctly Compensated waveform is achieved.
Figure 14 indicates the position of the adjustable capacitance on the main board.
C25 C24 C22 C23
Figure 14: The position of the attenuation compensation capacitance
3. Calibrate the probe in the CH2:
Replace the CH1 with CH2 in the step 1, redo it.
4. Calibrate the attenuation compensation capacitance of the CH2:
Set the Vertical scale of CH2 to 10V; adjust the C23 adjustable capacitance until the
Correctly Compensated waveform is achieved. Set the Vertical scale of CH2 to 20V; adjust
the C22 adjustable capacitance until the Correctly Compensated waveform is achieved.
Figure 14 indicates the position of the adjustable capacitance on the main board.
5. Calibrate the attenuation compensation resistance of the CH1:
Input an external 6V/1KHz sine signal to CH1, observe the actual value of Vpp. Then change
the frequency of the external signal to 10Hz, observe the actual value of Vpp. If it is different
from the previous one, adjust the R66 adjustable resistance to make it equal the previous one.
Figure 15 indicates the position of the adjustable resistance on the main board.
6. Calibrate the attenuation compensation resistance of the CH2:
Input an external 6V/1KHz sine signal to CH2, observe the actual value of Vpp. Then change
the frequency of the external signal to 10Hz, observe the actual value of Vpp. If it is different
from the previous one, adjust the R66 adjustable resistance to make it equal the previous one.
Figure 15 indicates the position of the adjustable resistance on the main board.
20
Section 4: Debugging and Calibration
R67
R66
Figure 15: The position of the attenuation compensation resistance
21
Section 5: Maintenance
Section 5: Maintenance
5.1 Brief Introduction
In the part, we will provide you the circuit diagram, the replaceable parts, the disassembling
method and the maintenance process.
5.2 Preparation and Safety Event
Before disassembling the oscilloscope, please read the safety outline as a warning.
5.3 Circuit Diagram
SDS Series oscilloscope makes up dual channel of digital storage oscilloscope and auto
multi-meter which the human machine interface is composed of the keyboard and LCD also with
the serial ports and USB interface. The hardware is composed of 5 numbers of modules. The
following Figure 17 is the brief diagram.
6P-2.0 F1-F5, H1-H5
LCD Main key board
Key board
50P-0.5 6P-2.0
Power supply 6P-2.5 18P-2.0
Adapter plate Main board
board
2P-3.96
Battery
Figure 16: SDS series block diagram
The schematic circuit diagram of the power supply is as follows:
22
AC/R C8
D1 GNDP
J6 3 1
C1 AC +
2 CD102M R9 0R15/2W
2 10mH C5 T1 GND0
CD102M C3 L1
C6 R5
4 32 4 1 6
R2 AC1 - C22 222/1KV 222/1KV R104/0.5W R10 0R15/2W
1 R205 1 2 4 7
KBP210 V8.7
C2
M PX275-X2
PIN2 R4 3 9 D4
CD102M 33uF/400V
AC/L R101 MB R20B100
R104/0.5w
C9
R1 0R68/1W 5 T-PFC_10 10 1 3 C11
1
R39 R42
C10
NTC 10D-11 R6