OWON SDS 6062, SDS 7102, SDS 8102, SDS 8202 digital storage oscilloscope Service Manual
Add to My manuals46 Pages
advertisement
SDS Series
Smart Digital Storage Oscilloscopes
Service Manual
■ SDS6062
■ SDS7102
■ SDS8102
■ SDS8202
WWW.OWON.COM.CN
Copyright ©Lilliput, Inc. All rights reserved
Lilliput products are covered by U.S. and other patents, issued and pending. Information in this publication supersedes that in all previously published material. Specifications and price change privileges reserved.
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 advance notice, for latest information, please refer to our website.
OWON is registered trademark of Lilliput, Inc.
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]
Fujian Lilliput Optoelectronics Technology Co., Ltd.: The mansion of optoelectronics hengsan road, Lantian industrial zone, Zhangzhou, Fujian, China
Tel: +86-596-2130430 Fax: +86-596-2109272
Web: www.owonchina.com 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.CN
Table of Contents
i
List of Figures
Figure 1: Connection of sweep rate and error inspection ..................................... 11
Figure 2: Waveform of sweep rate and error inspection....................................... 11
Figure 3: Connection of voltage division and error inspection.............................12
Figure 4: Connection of voltage measurement and error inspection ....................12
Figure 5: Connection of transient response inspection .........................................13
Figure 6: Waveform of transient response inspection...........................................13
Figure 7: Connection of vertical movement range inspection ..............................14
Figure 8: Connection of input impedance inspection ...........................................15
Figure 9: Connection of maximum input voltage testing .....................................15
Figure 11: The schematic circuit diagram of the power supply............................20
Figure 12: Remove the Power switch button........................................................20
Figure 13: Remove the Ground Connection .........................................................21
Figure 14：Loosen the screws of battery box ......................................................21
Figure 21: Remove the battery box container.......................................................26
Figure 25: Screws and cables of the adapter plate................................................29
List of Tables
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 manual
Protective ground
Measurement ground
Earth (gr
Term ound) inal 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: z 2 Passive probe: 1.2 m, 1:1 (10:1) z CD: x 1 (PC link application software) z Power cord: 1pcs, up to the standards of the country in which it is used. z USB cable z User Manual: 1pcs
Options: z 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. open the system function menu and execute the “Auto-calibration” procedure
(see “4.4 Auto-calibration” on P17).
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
Bandwidth
Acquisition
Input
Horizontal
System
Channel
Mode
Sample rate
(real time)
SDS6062 60MHz
SDS7102 100MHz
SDS8102 100MHz
SDS8202 200MHz
2 + 1 (External)
Normal, Peak detect, Averaging
SDS6062
500MS/s
(250MS/s for dual channels)
SDS7102
SDS8102
SDS8202
1GS/s
(500MS/s for dual channels)
2GS/s
(1GS/s for dual channels)
2GS/s
(1GS/s for dual channels)
DC, AC , Ground
1MΩ±2%, in parallel with 10pF±5pF
Input coupling
Input impedance
Probe attenuation factor
1X, 10X, 100X, 1000X
Max. input voltage 400V (PK-PK) (DC + AC PK-PK)
Bandwidth limit
20MHz, full bandwidth
Channel –channel isolation
50Hz: 100 : 1
10MHz: 40 : 1
Time delay between channel(typical)
150ps
Sampling rate range
SDS6062
SDS7102
SDS8102
SDS8202
0.5S/s~500MS/s single channel*
0.5S/s~250MS/s dual channel
0.5S/s~1GS/s single channel*
0.5S/s~500MS/s dual channel
0.5S/s~2GS/s single channel*
0.5S/s~1GS/s dual channel
0.5S/s~2GS/s single channel*
0.5S/s~1GS/s dual channel
Record length
Scanning speed
(S/div)
2
10M points on each channel
SDS6062
SDS7102
5ns/div～100s/div, step by 1～2～5
2ns/div～100s/div, step by 1～2～5
Section 1: General Information
Table 1: Specifications (cont.)
Performance Characteristics Instruction
SDS8102
SDS8202
2ns/div～100s/div, step by 1～2～5
1ns/div～100s/div, step by 1～2～5
Sampling rate / relay time accuracy
±100ppm
Single：
Interval( T ) accuracy
(DC～100MHz)
±(1 interval time+100ppm×reading+0.6ns);
Average>16：
A/D converter
±(1 interval time +100ppm×reading+0.4ns)
8 bits resolution (2 Channels simultaneously)
Sensitivity 2mV/div~10V/div
Vertical system
Displacement
Analog bandwidth
Single bandwidth
Low Frequency
Rise time
SDS6062 ±10 div
SDS7102
± 1V(2mV～100mV)；
SDS8102 ± 10V(200mV～1V)；
SDS8202 ± 100V(2V～10V)
60MHz, 100MHz, 200MHz, 300MHz
Full bandwidth
≥5Hz (at input, AC coupling, -3dB)
SDS6062 ≤5.8ns (at input, Typical)
SDS7102 ≤3.5ns (at input, Typical)
SDS8102 ≤3.5ns (at input, Typical)
SDS8202 ≤1.7ns (at input, Typical)
±3%
Measurement
DC accuracy
DC accuracy
(average)
Cursor
Average﹥16: ±(3% rdg + 0.05 div) for V
△ △
3
Section 1: General Information
Table 1: Specifications (cont.)
Performance Characteristics Instruction
Automatic
Vpp, Vmax, Vmin, Vtop, Vbase, Vamp,
Vavg, Vrms, Overshoot, Preshoot, Freq,
Period, Rise Time, Fall Time, Delay A→B ,
DelayA→B , +Width, -Width, +Duty, -Duty
Waveform Math
Waveform storage
Lissajous figure
Bandw idth
Phase differe nce
Frequency ( typical)
＋ , －, *, / ,FFT
15 waveforms
Full bandwidth
±3 degrees
1KHz square wave
Communication port
USB2.0, USB for file storage, VGA port or RS-232
﹡ Single channel is when only one input channel is working.
4
Section 1: General Information
Table 1: Specifications (cont.)
Trigger:
Performance Characteristics
Internal
Trigger level range EXT
EXT/5
Trigger level
Accuracy (typical)
Internal
EXT
EXT/5
Trigger displacement
Trigger Holdoff range
50% level setting
(typical)
100ns~10s
Input signal frequency ≥50Hz
Instruction
±6 div from the screen center
±600mV
±3V
±0.3div
±(40mV + 6% of Set Value)
±(200mV +6% of Set Value)
According to Record length and time base
Edge trigger
Pulse trigger slope Rising, Falling
Sensitivity 0.3div
Trigger condition
Positive pulse：＞, ＜, ＝ negative pulse：＞, ＜, ＝
Pulse Width range 24ns～10s
Modulation
Support standard NTSC, PAL and
SECAM broadcast systems
Video Trigger
Line number range 1-525 (NTSC) and 1-625 (PAL/SECAM)
Slope Trigger
Alternate Trigger
Trigger condition
Time setting
Trigger on CH1
Trigger on CH2
Positive pulse：＞, ＜, ＝ negative pulse：＞, ＜, ＝
24ns～10s
Edge, Pulse, Video, Slope
Edge, Pulse, Video, Slope
5
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
(Typical )
About 5V, with the Peak-to-Peak greater than 1MΩ of load.
Frequency (Typical ) Square wave of 1KHz voltage equal to or
Table 2: General Specifications (cont.)
Power
Mains Voltage 100～240 VAC RMS, 50/60Hz, CAT II
Power Consumption < 18W
Fuse 1A, T grade, 250V
Battery (optional)
Cell:558792 4000mAh/3.7V
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.
6
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 Ⅱ
Low Voltage Directive: 2006/95/EC
Sample tests
Standards used:
EN61010-1：2001
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+A2：2009
Electromagnetic Compatibility (EMC)-part 3: Limits-Section 2: Limits for Harmonic
Current Emissions (Equipment Input Current less than/equal to 16A per phase)
EN61000-3-3：2008
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".
7
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
Temperature
Relative Humidity
Height
Cooling Method
Working temperature: 0 ℃～ 40
Storage temperature: -20 ℃～ 60
≤ 90%
Operating: 3,000 m
Non-operating: 15,000 m
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.
8
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.
9
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 2 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
10
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=（B－A）÷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
11
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=（B－A）÷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
12
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 S＝B÷A×100%
C. Repeat step B and check the other channel.
13
Section 3: Test and Calibration
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:
∣（ B－A）÷A∣×100% and∣（C－A）÷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:
14
Section 3: Test and Calibration
Tested oscilloscope
LCR tester
CH1-BNC
Q9 connection
Figure 8: Connection of i nput 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 m aximum 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
15
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.
16
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 Calibration
The steps are as follows:
1. Connect the calibrator with BNC of CH1 by Q9
2. Make the calibrator to output sine wave with peak-peak value of 30V and 1KHZ
3. Set the coupling of CH1 as DC, voltage division as 5V, time base division as 1ms, zero position as -15v and observe the waveforms on the screen also adjust the attenuation compensation capacitance until the normal waveform display.
4. Repeat step 1 and 3 to turn the attenuation compensation capacitance of CH2 to correct value.
17
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 10 is the brief diagram.
Figure 10: SDS series block diagram
The schematic circuit diagram of the power supply is as follows:
18
Section 5: Maintenance
SOCBAT
C10
470uF/16V
C9
1000uF/25V
6 7
D4 M
2
D3 1N
1 4
1
D S
3
2
1
4
2
CS
NC
1 R620
GATE
VDD P
NC
RT
COM
GND
8
7
6
5
4 8
2 -X 275 MP X
R2 R2
2
1 3
4
R IG AC _T
U6 TL
6
5 4
3
8 4
19
Section 5: Maintenance
Figure 11: The schematic circuit diagram of the power supply
5.4 Removal and Installation Procedures
This section describes how to remove and install the major mechanical and electrical modules.
Removal procedures are as below. To Install the instrument, you could operate the removal procedure in reverse order. You should pay attention to the “Notice for installation” when installation.
1. Power switch Button z Use a soft cotton to encase the power switch button (to avoid scratching by pliers), pull out the button with pliers.
Figure 12: Remove the Power switch button
Notice for installation: Just press the power switch button to its hole.
2. Ground Connection z Place the oscilloscope face down on soft surface (such as an anti-static mat), with the bottom facing you. z Use a flat-bladed screwdriver to remove the Ground Connection.
20
Section 5: Maintenance
Figure 13: Remove the Ground Connection
3. Battery Box z Place the instrument with the bottom facing you. Loosen the two screws that secure the battery box to the rear chassis (do not take it off).
Figure 14：Loosen the screws of battery box z Take the two screws to pull the battery box out.
21
Section 5: Maintenance
Figure 15: Remove the battery box
Notice for installation:
Assemble the battery box as the figure below; insert it into the battery box container.
Figure 16: Assemble the battery box
4. Rear Panel z Remove the four screws that secure the rear panel with a cross-screwdriver.
Notice for installation:
The shortest screw should be installed in the screw hole marked in red in the third figure below.
22
Section 5: Maintenance
23
Section 5: Maintenance
Figure 17: Remove the screws of rear panel z Place the oscilloscope on its feet on soft surface, with the front facing you. z Release the snap marked in red in the figure below.
Figure 18: Unsnap the rear panel (1) z Place the instrument upside down, release the two snaps marked in red in the figure below.
24
Section 5: Maintenance
Figure 19: Unsnap the rear panel (2) z Detach the rear panel carefully, be ware that it still be connected to the font assembly by wires. z In the figure below, the red and black cable is the AC line power cable; the yellow is the grounding wire. Remove the screw secure the grounding wire to disconnect it. Grasp and pull up on the AC line power cable to disconnect it from power supply board.
Figure 20: Disconnect the rear panel
5. Battery box Container z Remove the four screws marked in yellow in the figure below. z Lift the battery box container a little, be ware that it is still be connected by the battery power cable, which marked in red in the figure below.
25
Section 5: Maintenance z Grasp and pull out the battery power cable.
Figure 21: Remove the battery box container
6. Power supply Board z The cable marked in yellow is the power cable of adapter plate, the red is transfer cable.
Disconnect both of them.
26
Section 5: Maintenance
Figure 22: Cables to power supply board z Remove the three screws marked in yellow, lift off the power supply board.
7. Adapter plate
Figure 23: Screws of power supply board
27
Section 5: Maintenance z Unlock the screen data cable, pull it out carefully.
Figure 24: Disconnect the screen data cable z The cable marked in blue in the figure below is the high-tension cable, green is the indicator light cable, and red is VGA cable. Pull out the three cables. z Remove the four screws marked in yellow in the figure below.
28
Section 5: Maintenance
Figure 25: Screws and cables of the adapter plate z Pull out the adapter plate carefully.
Figure 26: Remove the adapter plate
8. Chassis (including Fan and LCD)
29
Section 5: Maintenance z Remove the plastic cushion marked in the figure below.
Figure 27: Remove plastic cushion z Remove the six screws marked in the figure below. Lift the chassis a little, be aware that it is still connected to the main board by a cable.
30
Section 5: Maintenance
Figure 28: Screws of the chassis z Grasp and pull up on the fan power cable marked in the figure below.
31
Section 5: Maintenance
Figure 29: Fan power cable of the chassis
Notice for installation:
Make sure that the label of the LCD protection do not be covered by the front panel.
32
Section 5: Maintenance
Figure 30: Install the chassis (1) z Pull the indicator light cable and VGA cable through the holes in the chassis as the figure below.
Figure 31: Install the chassis (2)
9. Main Board z Remove the three screws marked in the figure below, lift off the main board.
33
Section 5: Maintenance
Figure 32: Screws secure the main board
Notice for installation:
The 2×6-Pin interface of main board should be matched to the one marked in the Figure 34.
Figure 33: Install the main board
34
Section 5: Maintenance
10. Done. The left assembly include key board and front panel.
Figure 34: Key board and front panel
35
Section 5: Maintenance
5.6 Examination and Maintenance
Power on the oscilloscope.
Does the display backlight light up?
No
Yes
Proceed to Figure 36 .
Does the scope display normally?
Yes
No
Dose the test signal of
1KHz/5V output normally?
Yes
No
Replace
Main board.
Are the Main board and
LCD connected correctly?
Yes Replace the
LCD.
No
Reconnect loose cables.
Replace
Main board.
Does the oscilloscope operate OK?
Yes
No
Done.
Figure 35: Troubleshooting procedure (1)
36
Section 5: Maintenance
Figure 36: Troubleshooting procedure (2)
37
Section 6: Replaceable Parts
Section 6: Replaceable Parts
6.1 Replaceable Parts List
Table 4: Replaceable parts list
Name Model
Power supply board PWR6062 V1.5
Adapter plate
Main board
SDS-CONNECT-VGA-V2.1
SDS6062 SDS6062-V1.4
SDS7102 SDS7102-V1.1
SDS8102 SDS8102-V1.1
SDS8202 SDS8202-V1.1
Fan JD-6010S1MO
Main key board SDS-KEY-V1.3
F1-F5, H1-H5 Key board SDS-KEY2-V1.4
LCD AT080TN52
6.2 Order Information
Please record the names, models and quantity of the accessories you want to order and contact with the nearest OWON service center. If the accessories are not in the above list, please kindly record the serial number and describe the accessories (includes functions) and the quantity and contact with the nearest OWON service center.
38
advertisement
Key Features
- High bandwidth
- Real-time sampling rates
- Variety of measurement functions
- Auto-calibration
- USB connectivity
- VGA output
- RS-232 communication