Owon SDS1000 User Manual Download Page 4

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Table of Contents

1. General Safety Requirements .......................................................................................... 1

2. Safety Terms and Symbols ............................................................................................... 2

3. Quick Start ....................................................................................................................... 4

Introduction to the Structure of the Oscilloscope

........................................................... 4

Front Panel

........................................................................................................................................ 4

Rear Panel

......................................................................................................................................... 5

Control Area

...................................................................................................................................... 6

User Interface Introduction

................................................................................................... 7

How to Implement the General Inspection

........................................................................ 9

How to Implement the Function Inspection

...................................................................... 9

How to Implement the Probe Compensation

.................................................................. 10

How to Set the Probe Attenuation Coefficient

................................................................ 11

How to Use the Probe Safely

.............................................................................................. 12

How to Implement Self-calibration

.................................................................................... 12

Introduction to the Vertical System

.................................................................................. 13

Introduction to the Horizontal System

............................................................................. 14

Introduction to the Trigger System

................................................................................... 15

4. Advanced User Guidebook ............................................................................................ 16

How to Set the Vertical System ............................................................................................... 17

Use Mathematical Manipulation Function ............................................................................. 18

The Waveform Calculation ................................................................................................................. 19

Using FFT function ............................................................................................................................ 19

Use Vertical Position and Scale Knobs ................................................................................... 23

How to Set the Horizontal System ........................................................................................... 23

Zoom the Waveform ........................................................................................................................... 24

How to Set the Trigger System ................................................................................................ 24

Single Trigger ..................................................................................................................................... 25

How to Operate the Function Menu ....................................................................................... 27

How to Set the Sampling/Display ....................................................................................................... 27

How to Save and Recall a Waveform .................................................................................................. 29

How to Implement the Auxiliary System Function Setting .................................................................. 35

How to Update your Instrument Firmware .......................................................................................... 37

How to Measure Automatically .......................................................................................................... 38

How to Measure with Cursors............................................................................................................. 43

How to Use Executive Buttons ........................................................................................................... 46

5. Communication with PC ............................................................................................... 48

6. Demonstration ............................................................................................................... 49

Summary of Contents for SDS1000

Page 1: ...SDS1000 Four Channel Series Digital Storage Oscilloscope User Manual www owon com ...

Page 2: ... that in the materials published originally 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 ...

Page 3: ...f the customer s 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 We shall not be obligated to furnish service under this warranty a to repair damage resulting from attempts by personnel other than our company representatives to install repair or service the product b to repair dam...

Page 4: ...to the Horizontal System 14 Introduction to the Trigger System 15 4 Advanced User Guidebook 16 How to Set the Vertical System 17 Use Mathematical Manipulation Function 18 The Waveform Calculation 19 Using FFT function 19 Use Vertical Position and Scale Knobs 23 How to Set the Horizontal System 23 Zoom the Waveform 24 How to Set the Trigger System 24 Single Trigger 25 How to Operate the Function Me...

Page 5: ...apturing a Single Signal 51 Example 4 Analyze the Details of a Signal 52 Example 5 Application of X Y Function 54 Example 6 Video Signal Trigger 55 7 Troubleshooting 57 8 Technical Specifications 58 General Technical Specifications 60 9 Appendix 62 Appendix A Enclosure 62 Appendix B General Care and Cleaning 62 ...

Page 6: ...tion with its input or output terminals When the instrument is powered by AC do not measure AC power sources directly otherwise it will cause a short circuit This is because the testing ground and power cord ground conductor are connected Check all Terminal Ratings To avoid fire or shock hazard check all ratings and markings on this product Refer to the user manual for more information about ratin...

Page 7: ...ces that could result in damage to this product or other property Terms on the product The following terms may appear on this product Danger Indicates an immediate hazard or injury possibility Warning Indicates a possible hazard or injury Caution Indicates potential damage to the instrument or other property Safety Symbols Symbols on the product The following symbol may appear on the product Hazar...

Page 8: ...re AC power when the AC powered oscilloscope is connected to the AC powered PC through the ports Warning To avoid fire or electrical shock when the oscilloscope input signal 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 ...

Page 9: ...gh which you can set the different options for the current menu The other buttons are function buttons through which you can enter different function menus or obtain a specific function application directly 3 5 6 1 2 7 4 Figure 3 1 Front panel 1 Display area 2 Menu selection buttons Select the right menu item 3 Control button and knob area 4 Probe Compensation Measurement signal 5V 1kHz output 5 S...

Page 10: ...ts 3 AC power input jack 4 Foot stool Adjust the tilt angle of the oscilloscope 5 USB Device port It is used to transfer data when external USB equipment connects to the oscilloscope regarded as slave device For example to use this port when connect PC to the oscilloscope by USB ...

Page 11: ...ction in the Utility function menu Pressing this button is equal to the Save option in the Save menu The waveform configure or the display screen could be saved according to the chosen type in the Save menu 5 Vertical control area with 5 buttons and 2 knobs CH1 CH4 buttons correspond to setting menu in CH1 CH4 Math button provides access to math waveform functions FFT The Vertical Position knob co...

Page 12: ...r a trigger Scan Capture and display the waveform continuously Stop Data acquisition stopped 4 The two blue dotted lines indicates the vertical position of cursor measurement 5 The T pointer indicates the horizontal position for the trigger 6 The pointer indicates the trigger position in the record length 7 It shows present triggering value and displays the site of present window in internal memor...

Page 13: ...he Cursor RMS WP the Screen Duty RP the Phase A B FP the Phase A B PC the Pulse count PC the Pulse count E the Rise edge count E the Fall edge count AR the Area CA the Cycle area 17 The readings show the record length 18 The frequency of the trigger signal 19 The readings show current sample rate 20 The readings indicate the corresponding Voltage Division and the Zero Point positions of the channe...

Page 14: ...th reference to this description If it is found that there is any accessory lost or damaged please get in touch with our distributor responsible for this service or our 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 our distributor...

Page 15: ...r 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 attenuation coefficient of the probe in the menu as 10X and that of the switch in the probe as 10X see How to Set the ...

Page 16: ...e probe attenuation coefficient in the menu of oscilloscope 1 Push the function menu button of the used channels CH1 CH4 button 2 Select Probe in the right menu turn the M knob to select the proper value in the left menu corresponding to the probe This setting will be valid all the time before it is changed again Caution The default attenuation coefficient of the probe on the instrument is preset ...

Page 17: ...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 How to Implement Self calibration The self calibration application can make the oscilloscope reach the optimum condition rapidly to obtain the m...

Page 18: ... press CH1 CH2 CH3 or CH4 at first to select the desired channel Then turn the Vertical Position and Vertical Scale knobs to set the values Figure 3 10 Vertical Control Zone The following practices will gradually direct you to be familiar with the using of the vertical setting 1 Press CH1 CH2 CH3 or CH4 to select the desired channel 2 Use the Vertical Position knob to show the selected channel wav...

Page 19: ...found that the scale factor of the selected channel in the status bar has been changed accordingly Introduction to the Horizontal System Shown as Figure 3 11 there are a button and two knobs in the Horizontal Controls The following practices will gradually direct you to be familiar with the setting of horizontal time base Figure 3 11 Horizontal Control Zone 1 Turn the Horizontal Scale knob to chan...

Page 20: ...Zone 1 Push the Trigger Menu button and call out the trigger menu With the operations of the menu selection buttons the trigger setting can be changed 2 Use the Trigger Level knob to change the trigger level setting By turning the Trigger Level knob the trigger indicator in the screen will move up and down With the movement of the trigger indicator it can be observed that the trigger level value d...

Page 21: ...tem How to Set the Sampling Display How to Save and Recall Waveform How to Implement the Auxiliary System Function Setting How to Update your Instrument Firmware How to Measure Automatically How to Measure with Cursors How to Use Executive Buttons It is recommended that you read this chapter carefully to get acquainted the various measurement functions and other operation methods of the oscillosco...

Page 22: ...escription of the Channel Menu is shown as the following list Function Menu Setting Description Coupling DC AC Ground Pass both AC and DC components of the input signal Block the DC component of the input signal Disconnect the input signal Inverted ON OFF Display inverted waveform Display original waveform Probe 1X 10X 100X 1000X Match this to the probe attenuation factor to have an accurate readi...

Page 23: ...at is on the probe see How to Set the Probe Attenuation Coefficient on P11 If the attenuation coefficient of the probe is 1 1 the menu setting of the input channel should be set to1X Take the Channel 1 as an example the attenuation coefficient of the probe is 10 1 the operation steps are shown as follows 1 Push the CH1 button to show the CH1 SETUP menu 2 In the right menu select Probe In the left ...

Page 24: ...voltage division of the Math waveform Prev Page Enter previous page Taking the additive operation between Channel 1 and Channels 2 for example the operation steps are as follows 1 Press the Math button to display the math menu in the right The pink M waveform appears on the screen 2 In the right menu select Type as Math 3 In the right menu select Factor1 as CH1 4 In the right menu select Sign as 5...

Page 25: ...T source Window Hamming Rectangle Blackman Hanning Kaiser Bartlett Select window for FFT Format Vrms dB Select Vrms for Format Select dB for Format Next Page Enter next page Hori Hz frequency frequency di v Switch to select the horizontal position or time base of the FFT waveform turn the M knob to adjust it Vertical div V or dBVrms Switch to select the vertical position or voltage division of the...

Page 26: ... determine which window to use Use the following guidelines to select the best window Type Characteristics Window Hamming Better solution for magnitude than Rectangle and good for frequency as well It has slightly better frequency resolution than Hanning Recommend to use for Sine periodic and narrow band random noise Transients or bursts where the signal levels before and after the event are signi...

Page 27: ... to the traditional Gaussian RBW This window is also good for random signals Bartlett The Bartlett window is a slightly narrower variant of the triangular window with zero weight at both ends Notes for using FFT Use the default dB scale for details of multiple frequencies even if they have very different amplitudes Use the Vrms scale to compare frequencies DC component or offset can cause incorrec...

Page 28: ...played at the left bottom corner of the screen see Figure 4 1 Figure 4 1 Information about Vertical Position How to Set the Horizontal System The HORIZONTAL CONTROLS includes the Horizontal HOR button and such knobs as Horizontal Position and Horizontal Scale 1 Horizontal Position knob this knob is used to adjust the horizontal positions of all channels include those obtained from the mathematical...

Page 29: ... data and display waveform Once trigger is set correctly it can convert the unstable display to meaningful waveform When DSO starts to acquire data it will collect enough data to draw waveform on left of trigger point DSO continues to acquire data while waiting for trigger condition to occur Once it detects a trigger it will acquire enough data continuously to draw the waveform on right of trigger...

Page 30: ...r mode to trigger on rising edge or falling edge Push the Trigger Menu button to display the Trigger menu on the right Select Type as Single in the right menu Select Single as Edge in the right menu In Edge Trigger mode the trigger setting information is displayed on bottom right of the screen for example indicates that trigger type is edge trigger source is CH1 coupling is DC and trigger level is...

Page 31: ...er menu on the right Select Type as Single in the right menu Select Single as Video in the right menu In Video Trigger mode the trigger setting information is displayed on bottom right of the screen for example indicates that trigger type is Video trigger source is CH1 and Sync type is Even Video Trigger menu list MENU SETTING INSTRUCTION Single Video Set vertical channel single trigger type as vi...

Page 32: ...Acquire button Function Menu Setting Description Acqu Mode Sample Peak Detect Average Normal sampling mode Use to capture maximal and minimal samples Finding highest and lowest points over adjacent intervals It is used for the detection of the jamming burr and the possibility of reducing the confusion It is used to reduce the random and don t care noises with the optional number of averages Turn t...

Page 33: ...ion knobs are used to set the horizontal scale and position The Vertical Scale and the Vertical Position knobs are used to set the vertical scale and position continuously The following functions can not work in the XY Format Reference or digital wave form Cursor Trigger control FFT Operation steps 1 Push the Acquire button to show the right menu 2 Select XY Mode as ON or OFF in the right menu Cou...

Page 34: ...left menu turn the M knob to choose the object which the waveform is saved to or recall from Recall or close the waveform stored in the current object address When the show is ON if the current object address has been used the stored waveform will be shown the address number and relevant information will be displayed at the top left of the screen if the address is empty it will prompt None is save...

Page 35: ...st The file name is editable The file is stored in BMP format Save and Recall the Waveform The oscilloscope can store 16 waveforms which can be displayed with the current waveform at the same time The stored waveform called out can not be adjusted In order to save the waveform of CH1 CH2 CH3 CH4 and Math into the object Wave0 the operation steps should be followed 1 Turn on CH1 CH2 CH3 CH4 and Mat...

Page 36: ... supplied CD Shortcut for Save function The Copy button on the bottom right of the front panel is the shortcut for Save function in the Utility function menu Pressing this button is equal to the Save option in the Save menu The waveform configure or the display screen could be saved according to the chosen type in the Save menu Save the current screen image The screen image can only be stored in U...

Page 37: ...is through formatting software to format Use system provided function to format the USB disk 1 Connect the USB disk to the computer 2 Right click Computer Manage to enter Computer Management interface 3 Click Disk Management menu and information about the USB disk will display on the right side with red mark 1 and 2 Figure 4 2 Disk Management of computer 4 Right click 1 or 2 red mark area choose F...

Page 38: ... FAT32 with allocation unit size 4096 after formatting Use Minitool Partition Wizard to format Download URL http www partitionwizard com free partition manager html Tip There are many tools for the USB disk formatting on the market just take Minitool Partition Wizard for example here 1 Connect the USB disk to the computer 2 Open the software Minitool Partition Wizard ...

Page 39: ...about the USB disk will display on the right side with red mark 1 and 2 Figure 4 6 Reload Disk 4 Right click 1 or 2 red mark area choose Format Figure 4 7 Choose format 5 Set File System FAT32 Cluster size 4096 Click OK Figure 4 8 Format setting 6 Click Apply at the top left of the menu Then click Yes on the pop up warning ...

Page 40: ...re 4 10 Format process 8 Format the USB disk successfully Figure 4 11 Format successfully How to Implement the Auxiliary System Function Setting Config Push the Utility button select Function in the right menu select Configure in the left menu The description of Configure Menu is shown as the follows ...

Page 41: ...ocedure should be executed to obtain the highest level of accuracy Before executing the self calibration procedure disconnect all probes or wires Function Menu Setting Description Function Configure Show the configure menu KeyLock Lock all keys Unlock method push Trigger Menu button in trigger control area then push Force button repeat 3 times About Show the version and serial number Function Menu...

Page 42: ... a Waveform on page 29 Update Use the front panel USB port to update your instrument firmware using a USB memory device Refer to How to Update your Instrument Firmware on page 37 How to Update your Instrument Firmware Use the front panel USB port to update your instrument firmware using a USB memory device USB memory device requirements Insert a USB memory device into the USB port on the front pan...

Page 43: ... take up to three minutes After completion the instrument will be shut down automatically 7 Press the button to power on the instrument How to Measure Automatically Push the Measure button to display the menu for the settings of the Automatic Measurements At most 8 types of measurements could be displayed on the bottom left of the screen The oscilloscopes provide 39 parameters for auto measurement...

Page 44: ...ress Remove again to remove the selected measure type Remove All Remove all the measures Prev Page Enter previous page Measure Only if the waveform channel is in the ON state the measurement can be performed The automatic measurement can not be performed in the following situation 1 On the saved waveform 2 On the Dual Wfm Math waveform 3 On the Video trigger mode On the Scan format period and freq...

Page 45: ...t Cycle RMS and Cursor RMS Figure 4 13 below shows a pulse with some of the voltage measurement points Figure 4 13 Mean The arithmetic mean over the entire waveform PK PK Peak to Peak Voltage RMS The true Root Mean Square voltage over the entire waveform Max The maximum amplitude The most positive peak voltage measured over the entire waveform Min The minimum amplitude The most negative peak volta...

Page 46: ...ents include Period Frequency Rise Time Fall Time D width D width Duty Duty Delay A B Delay A B and Duty cycle Figure 4 14 shows a pulse with some of the time measurement points Figure 4 14 Rise Time Time that the leading edge of the first pulse in the waveform takes to rise from 10 to 90 of its amplitude Fall Time Time that the falling edge of the first pulse in the waveform takes to fall from 90...

Page 47: ...ount The number of positive pulses that rise above the mid reference crossing in the waveform PulseCount The number of negative pulses that fall below the mid reference crossing in the waveform RiseEdgeCnt The number of positive transitions from the low reference value to the high reference value in the waveform FallEdgeCnt The number of negative transitions from the high reference value to the lo...

Page 48: ...on Measure in the main window Measure in the extension window Line a b ab Turn the M knob to move line a Turn the M knob to move line b Two cursors are linked Turn the M knob to move the pair of cursors Source CH1 CH2 CH3 CH4 Display the channel to which the cursor measurement will be applied Perform the following operation steps for the time and voltage cursor measurement of the channel CH1 1 Pus...

Page 49: ...turn the M knob to move it 6 Push the horizontal HOR button to enter wave zoom mode Push Cursor to show the right menu select Window as Main or Extension to make the cursors shown in the main window or zoom window Figure 4 15 Time Voltage Cursor Measurement Auto Cursor For the AutoCursr type the horizontal cursors are set as the intersections of the vertical cursors and the waveform Auto Cursor Th...

Page 50: ... of cursors Source Math FFT Display the channel to which the cursor measurement will be applied Perform the following operation steps for the amplitude and frequency cursor measurement of math FFT 1 Press the Math button to display the right menu Select Type as FFT 2 Push Cursor to display the cursor menu 3 In the right menu select Window as Extension 4 Press the first menu item in the right menu ...

Page 51: ...ng Vertical Coupling Current Channel Coupling Current Vertical Scale Adjust to the proper division Horizontal Level Middle or 2 div Horizontal Sale Adjust to the proper division Trigger Type Slope or Video Trigger Source CH1 or CH2 or CH3 or CH3 Trigger Coupling DC Trigger Slope Current Trigger Level 3 5 of the waveform Trigger Mode Auto Display Format YT Force Stop Inverted Off Zoom Mode Exit Jud...

Page 52: ...un Stop button Enable or disable sampling on input signals Notice When there is no sampling at STOP state the vertical division and the horizontal time base of the waveform still can be adjusted within a certain range in other words the signal can be expanded in the horizontal or vertical direction When the horizontal time base is 50ms the horizontal time base can be expanded for 4 divisions downw...

Page 53: ...ed CD 2 Connection Use a USB data cable to connect the USB Device port in the right panel of the Oscilloscope to the USB port of a PC 3 Install the driver Run the Oscilloscope communication software on PC push F1 to open the help document Follow the steps of title I Device connection in the document to install the driver 4 Port setting of the software Run the Oscilloscope software click Communicat...

Page 54: ...will implement the Autoset to make the waveform optimized based on which you can further regulate the vertical and horizontal divisions till the waveform meets your requirement 2 Perform Automatic Measurement The oscilloscope can measure most of the displayed signals automatically To measure the period the frequency of the CH1 following the steps below 1 Push the Measure button to show the right m...

Page 55: ...scope CH1 channel with the circuit signal input end and the CH2 channel to the output end Operation Steps 1 Push the Autoset button and the oscilloscope will automatically adjust the waveforms of the two channels into the proper display state 2 Push the Measure button to show the right menu 3 Select CH1 in the right menu 4 In the left Type menu turn the M knob to select PK PK 5 In the right menu s...

Page 56: ...irst to run your test using auto trigger to find out the closest trigger level and trigger type this helps user to make few small adjustments to achieve a proper trigger level and mode Here is how we achieve this The operation steps are as follows 1 Set the probe menu attenuation coefficient to 10X and that of the switch in the probe to 10X see How to Set the Probe Attenuation Coefficient on P11 2...

Page 57: ...signal level push the Run Stop button and wait a trigger Once there is a burr occurring the instrument will trigger automatically and record the waveform during the period around the trigger time By turning the Horizontal Position knob in the horizontal control area in the panel you can change the horizontal triggering position to obtain the negative delay making an easy observation of the wavefor...

Page 58: ... to reduce the noise level as lower as possible this would enable user to have more details about the signal The Average function offered by our Oscilloscope can help you to achieve this Here are the steps for how to enable Average function 1 Push the Acquire button to display the right menu 2 In the right menu select Acqu Mode as Average 3 Turn the M knob and observe the waveform obtained from av...

Page 59: ...put of the circuit in the form of X Y coordinate graph please operate according to the following steps 1 Set the probe menu attenuation coefficient for 10X and that of the switch in the probe for 10X see How to Set the Probe Attenuation Coefficient on P11 2 Connect the probe of channel 1 to the input of the network and that of Channel 2 to the output of the network 3 Push the Autoset button with t...

Page 60: ...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 Example 6 Video Signal Trigger Observe the vi...

Page 61: ...u select Single as Video 4 In the right menu select Source as CH1 5 In the right menu select Modu as NTSC 6 In the right menu press Next Page select Sync as Field 7 Turn the Vertical Scale Vertical Position and Horizontal Scale knobs to obtain a proper waveform display see Figure 6 7 Figure 6 7 Waveform Captured from Video Field Trigger ...

Page 62: ...ient for the input channel and the attenuation ration of the probe to make sure they are match see How to Set the Probe Attenuation Coefficient on P11 4 There is a waveform displayed but it is not stable Check whether the Source item in the TRIG MODE menu is in conformity with the signal channel used in the practical application Check on the trigger Type item The common signal chooses the Edge tri...

Page 63: ...ce Characteristics Instruction Bandwidth 100 MHz Channel 4 channels Acquisition Mode Normal Peak detect Averaging Sample rate real time 1 GS s Input Input coupling DC AC Ground Input impedance 1 MΩ 2 in parallel with 15 pF 5 pF Input coupling 1X 10X 100X 1000X Max input voltage 400V DC AC PK PK Channel channel isolation 50Hz 100 1 10MHz 40 1 Time delay between channel typical 150ps Bandwidth limit...

Page 64: ...easurement Cursor V T T V between cursors auto cursor Automatic Period Frequency Mean PK PK RMS Max Min Top Base Amplitude Overshoot Preshoot Rise Time Fall Time Pulse Width Pulse Width FRR FRF FFR FFF LRR LRF LFR LFF Duty Cycle Duty Cycle Delay A B Delay A B Cycle RMS Cursor RMS Screen Duty Phase A B Phase A B Pulse Count Pulse Count Rise Edge Count Fall Edge Count Area and Cycle Area Waveform Ma...

Page 65: ...SECAM General Technical Specifications Display Display Type 7 Colored LCD Liquid Crystal Display Display Resolution 800 Horizontal 480 Vertical Pixels Display Colors 65536 colors TFT screen Output of the Probe Compensator Output Voltage Typical About 5 V with the Peak to Peak voltage 1 MΩ Frequency Typical Square wave of 1 KHz Power Mains Voltage 100 240 VACRMS 50 60 Hz CAT Ⅱ Power Consumption 15 ...

Page 66: ...8 Technical Specifications 61 Dimension 301 mm 152 mm 70 mm L H W Weight About 1 1 kg Interval Period of Adjustment One year is recommended for the calibration interval period ...

Page 67: ...crystal 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 ...

Page 68: ...ed 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 ...

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