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CHAPTER 2. SETUP

12

Figure 2.10: Offset Calibration Screen

2.6 Calibration

You can easily calibrate the recorder inputs for the voltage and thermocouple offsets. This will remove any offset
present on different channels.

To do so:

1. Let the unit work for 20 minutes (ambient temperature 68-77F (20-25C))

2. Enter the recorder main page and then press the “Setup” key

3. Select the “Additional Option” menu

4. Select the “Electric Calibration” menu

5. Press the “Calibration offset” to start calibration. This takes approximatly 5 minutes

6. Restart the unit

2.6.1 Factory Default Calibration

You can restore the default factory calibration to correct any possible mistake in the calibration coefficients.
This restores calibration values configured at the factory. This is performed as follows:

1. Let the unit work for 20 minutes (ambient temperature 68-77F (20-25C))

2. Enter the recorder main page and then press the “Setup” key

3. Select the “Additional Option” menu

4. Select the “Electric Calibration” menu

5. Press the “Recover factory calibration”

6. Restart the unit.

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Содержание DAS240-BAT

Страница 1: ...DAS240 BAT User Manual Portable Multi Channel Recorder Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com ...

Страница 2: ...trical energy available and the voltage impulses that may occur on electrical conductors associated with these category ratings The category rating is a Roman numeral of I II III or IV This rating is also accompanied by a maximum voltage of the circuit to be tested which defines the voltage impulses expected and required insulation clearances These categories are Category I CAT I Measurement instr...

Страница 3: ... conductor electrical outlet The power jack and mating plug of the power cable meet IEC safety standards Do not alter or defeat the ground connection Without the safety ground connection all accessible conductive parts including control knobs may provide an electric shock Failure to use a properly grounded approved outlet and the recommended three conductor AC line power cable may result in injury...

Страница 4: ...e nature of any contamination of the instrument Clean the instrument only as instructed Do not clean the instrument its switches or its terminals with contact cleaners abrasives lubricants solvents acids bases or other such chemicals Clean the instrument only with a clean dry lint free cloth or as instructed in this manual Not for critical applications This instrument is not authorized for use in ...

Страница 5: ...ge ratings and current ratings specified in this manual or on the back of the instrument Failure to do so may damage the instrument lead to a safety hazard or cause a fire Failure to use the specified fuses will void the warranty Servicing Do not substitute parts that are not approved by B K Precision or modify this instrument Return the instrument to B K Precision for service and repair to ensure...

Страница 6: ...dicates a hazardous situation which if not avoided will result in minor or moderate injury A Caution Refer to the text near the symbol Electric Shock hazard Alternating current AC Chassis ground Earth ground On Power This is the In position of the power switch when instru ment is ON Off Power This is the Out position of the power switch when instrument is OFF NOTICE is used to address practices no...

Страница 7: ...itted samples and found in compliance with European Low Voltage directive 2014 35 UE IEC 61010 1 European EMC directive 2014 30 UE Emission standard EN 61326 1 EN 31326 2 1 Immunity standard EN 61326 1 EN 61326 2 1 Installation category Measure 100V CAT I Pollution degree 2 ...

Страница 8: ... Measurement With Pt100 Pt1000 8 2 3 4 Resistance Measurement 9 2 3 5 Current Measurement 9 2 4 External Power 10 2 5 Battery 11 2 5 1 To Charge the Battery 11 2 6 Calibration 12 2 6 1 Factory Default Calibration 12 2 7 Keypad Lock 13 3 System Setup 14 3 0 1 Language 14 3 0 2 Screen shut off dimming 15 3 0 3 VNC 15 3 0 4 Additional options 15 3 0 5 Software update 15 3 0 6 Instrument Configuration...

Страница 9: ...signal combination alarm 42 10 4 Logic Digital signal alarm trigger 43 10 5 Alarm on recording start Trigger Acquisition 44 11 Logic Channels 46 11 1 Logic Input Connector 46 11 2 Logic channel setup 47 11 3 Timing 47 11 4 Alarm outputs 48 12 File Management 49 12 1 Setup Files 49 12 1 1 Default 49 12 1 2 Save Setup files 49 12 1 3 Load setup files 50 12 2 Recordings files 50 13 Remote Interfaces ...

Страница 10: ...ermocouple 60 A 1 Measurement accuracy Pm 61 A 2 Voltage of thermocouple mV 61 A 2 1 Example Of Accuracy Calculation 61 61 63 A 3 Accuracy class class index B Grounding Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com ...

Страница 11: ...ive interface on a wide capacitive and color 10 1 touchscreen The measurement parameters are easy to program The recording is made directly to the internal 32 GB memory card The DAS240 is composed with a main base frame and extension modules of 20 channels each The DAS240 is easy to program via Ethernet Wi Fi and uses the NTP FTP and VNC protocols for a better use The DAS240 can be delivered with ...

Страница 12: ...n display configuration 9 Recording Display 10 Recording Replay Screen 11 Channel Configuration Screen 1 2 Electrical Connections Figure 1 3 Electrical Connections 1 Battery supply charger 2 Battery charging LED 3 ON OFF switch and switching on indicator 4 2 USB connectors 5 RJ45 connector for the Ethernet 10 100 Base interface 6 DB 25 connector for the 16 logic inputs and the alarm output ...

Страница 13: ...al Block 7 Ground connection 8 24 point connector for an access to the external module 1 3 Extension Module Signals are connected to the unit via terminal blocks see Figure 1 5 These blocks accomodate 20 connections each and may be chanined together to provide more channels ...

Страница 14: ...od Also by using a configurable low pass filter per channel measurements can be made filtering out higher frequency components Measurements are taken in sequence The sample period of each channel is cumulative Example Main noise at 50Hz or engine noise at 1kHz For white noise or noise with lower frequency lower than recording frequency you can choose a software filter Example Recording 9 Channels ...

Страница 15: ... to the oscilloscope F t mode This display is accessible from the Home menu Figure 2 1 by pressing the F t key Figure 2 1 Home Screen On powerup the unit recalls the last settings and configuration used 2 1 1 Switching Off To switch off the recorder press the ON OFF key A dialog appears prompting the user to confirm the power off Select the Green check mark to proceed The dialog dissapears if eith...

Страница 16: ...ee Figure 2 2 Alternatively a reset to original defaults is possible With the power off press the power button to turn the unit on While the unit is starting quickly and repeatedly press power button until the display shows the white startup screen A setup_error cnf file will be created in the base folder of the internal SD The unit resets to defaults and reverts to French To change the language b...

Страница 17: ... together Screw the plates with the adjacent modules Stick the additional adhesive buttress Connect the cable using unlocking levers Connect the cable on the DAS240 must be powered off first Switch on the unit Note The unit is delivered with a 70cm cable 2 3 Making Measurement Connections Using the terminal blocks provided with the unit Figure 2 6 Phoenix Contacts SMSTB 2 5 3 ST5 08 1826296 2 3 1 ...

Страница 18: ... Pt1000 probe must be connected to the and terminals The current is injected through the GND terminal For a 4 wire Pt100 Pt1000 the mounting will be in 3 wires the 4th wire will not be connected Note the gnd current injection is shared by all channels Figure 2 7 shows 2 ways to wire the temperature sensors Using the 2 wire method the and GND terminals are connected together at the terminal block I...

Страница 19: ...e Channels menu The Type row shows the current function per channel Press the square in the channel column and Type row to open the configuration dialog for the function type See Figure 2 8 Select the Current menu option The window will change to show a button listing the current shunt value To change the value press the button and a dialog for setting the shunt value opens See Figure 2 9 Select t...

Страница 20: ...ck the instrument chassis and cabinet must be connected to an electrical safety ground This instrument is grounded through the ground conductor of the supplied three conductor AC line power cable The power cable must be plugged into a three conductor electrical outlet Warning When the charger is connected to the unit the chassis is connected to the power supply earth ground ...

Страница 21: ...tore the pack in a place exposed to excessive heat Do not damage the protective sheath of the pack Do not store the in a vehicle exposed to the sun The battery should last at least 200 full charge discharge cycles or 2 years To ensure long battery life Do not store for a long time without use Store the battery at around 40 charge Do not fully charge or discharge the battery before storage When the...

Страница 22: ...libration menu 5 Press the Calibration offset to start calibration This takes approximatly 5 minutes 6 Restart the unit 2 6 1 Factory Default Calibration You can restore the default factory calibration to correct any possible mistake in the calibration coefficients This restores calibration values configured at the factory This is performed as follows 1 Let the unit work for 20 minutes ambient tem...

Страница 23: ...n key Press the Locking the recorder key Press the green check mark to confirm and lock the unit The keypad lock will occur 10 seconds after confirmation All the keys of the unit will be locked A yellow padlock appears in the upper right corner of the display when locked To unlock the recorder press the lock icon in the upper right corner repeatedly ...

Страница 24: ...al settings Beep Screen Brightness Lock Calibration Startup screen and Modbus 6 Update 7 Load default settings 8 Load configuration from disk 9 Save configuration to disk 10 Network status and setup 11 Alarms 12 Channels 3 0 1 Language The system language may be set to one of 6 French Spanish English Italian German and Sweedish Open the language dialog by pressing the flag icon on the setup screen...

Страница 25: ...ional options Setting the screen brightness locking the touchscreen calibrating the machine setting the startup screen image and settings for the Modbus server are available in this menu See Section 2 6 for calibration information and see Section 2 7 for screen lock information 3 0 5 Software update See Chapter 14 for details about updating the internal software 3 0 6 Instrument Configuration load...

Страница 26: ... button opens the network configuration dialog Available options are shown in this window depending on the hardware connected wifi adapter Set the networking settings necessary here such as whether to use DHCP or the specific ethernet settings necessary IP Address Mask and Gateway If using WiFi experimental currently only an open wireless network is working reliably 3 0 8 Alarms See Chapter 10 for...

Страница 27: ...orresponding to the channel and parameter opens a dialog box with options for configuring that parameter The contents of the dialog change depending on the selected parameter value For example when the channel type parameter is opened selecting the Thermocouple value modifies the box to give further options for thermocouples type temperature units etc Back on the main channel table the value in th...

Страница 28: ...ers values and options are also viewable for a single channel on a single screen To open this screen press the box displaying the Channel ID A1 for example This opens a window for setting a greater number of values than available from the channels table The plot color and thickness are available here for example See Figure 4 2 ...

Страница 29: ... by pressing the button on the XY plot screen select the custom grid check box select the folder containing the bitmap to be used middle button and select the bitmap using the right most button on the line Figure 5 1 XY Display Screen 1 Screen configuration Setting the measurement display on screen 2 Traced allows to start or stop the outline 3 Delete allows to delete the screen 4 X channel Choice...

Страница 30: ...l Values show the numerical panel showing values in a table Display Boundaries show or hide the axes Custom Grid configure the grid and possible background image Colors set the color of the Background grid and cursor using a color picker Along with the XY plot a numeric representation of the current signal values is show ...

Страница 31: ...tion the instant value will show up By visualizing the cursors then the differ ence value between cursors as well as T1 and T2 values corresponding to cursors T1 and T20 will be displayed 3 Right to hide this window when hidden the icon points left Figure 5 3 Numerical window Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com ...

Страница 32: ...e display shows the full record and resises to accomodate all of the data taken See Chapter 8 for more information about recording data Figure 6 1 F t Screen 6 1 F t Menu keys 1 Screen Setup Section 6 2 2 Configure custom pages Section 6 2 1 3 Freeze Screen Section 6 3 4 Full Screen change the view to full screen touch the screen anywhere to exit 5 Timebase Section 6 4 6 Numerical display display ...

Страница 33: ...ced by the option to enable a custom grid background image When a custom grid is enabled the options of directory and file are added to the dialog as in Figure 6 3 Lastly the choice of displaying points as dots or vectors is available for the XY display mode Figure 6 3 Screen Setup Dialog XY mode 6 2 1 Custom Pages Using this menu a set of 20 channels per page can be shown This allows selecting fr...

Страница 34: ...ntal axis at 2 5 divisions above the bottom of the display All together the range sets how many volts tall the vertical axis is center sets the 6 3 Freeze Screen and Cursor Measurements Freezes the graph at the screen to perform measurements through cursors calculations save or print the measurements at screen in the F t mode When frozen horizontal and vertical cursor icons are added to the right ...

Страница 35: ...n Figure 6 6 Use the arrow buttons at the top to increase of decrease the number of math functions Use the arrows at the bottom to change the channel on which the math is done or press the channel named for each row to set the desired channel See Figure 6 7 for the set of functions available The values calculated for each function configured are shown on the main plot screen colored the same as th...

Страница 36: ...T 26 Figure 6 6 F t Channel math settings dialog Figure 6 7 F t Channel math functions dialog Drawing Math function Calculation Notes Minimum The lowest negative voltage bottom Maximum The highest positive volt age peak ...

Страница 37: ...litude High Low On positive oscillation Max High Amplitude 100 On negative oscillation Low Min Amplitude 100 Frequency 1 P eriod Average frequency Period Duration of N complete periods N Average duration of a com plete cycle calculated on as many periods as possible Rising edge T1 10 Amplitude T2 90 Amplitude Trise T2 T1 Falling edge T1 90 Amplitude T2 10 Amplitude Tfall T2 T1 ...

Страница 38: ...0 of ampli tude Positive cyclic ratio positive pulse duration period Negative cyclic ratio negative pulse duration period Average 1 N N i 1 Vi N total number of dots Calculation on the whole graphic range RMS 1 N N i 1 Vi 2 Calculation on the whole graphic range Standard deviation 1 N N i 1 Vi V 2 Calculation on the whole graphic range Table 6 1 Waveform math functions Test Equipment Depot 800 517...

Страница 39: ...CHAPTER 6 F T PLOT 29 Figure 6 8 Math Menu ...

Страница 40: ...ach display page is accessed by pressing the right and left arrows Figure 7 1 Numeric Display Screen 1 Cycle display screens channels custom sets logic functions etc 2 Digital channel state shown when Logic Channels option is set in the Channels and Functions menu 3 Reset minimum and maximum recorded values 4 Individual channels click within each channel to open the configuration menu for that cha...

Страница 41: ...on when in any of the 3 data display modes F t XY or Numeric to start a recording See Figure Recording starts when the trigger condition is met If the trigger function is not running stop is selected on the trigger setup page then recording starts immediately 8 1 Recording playback View and analysis of stored recordings is accessed from the View Records button on the Home screen See Section curren...

Страница 42: ...CHAPTER 8 RECORDING 32 Figure 8 2 Record screen Figure 8 3 Recording started ...

Страница 43: ...CHAPTER 8 RECORDING 33 Figure 8 4 Recording playback Figure 8 5 Load saved recording file dialog ...

Страница 44: ...CHAPTER 8 RECORDING 34 Figure 8 6 Saved recording loaded Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com ...

Страница 45: ... data recording to disk Opening the Start or Stop trigger menus open the start condition dialogs with the following recording start options Manual pressing a key Trigger based on Analog or Digital signal conditions See 9 3 for details Waiting after a delay or at a specified date and hour See 9 1 for details Automatic occurs immediately and automatically stops when the file is full Pre Trigger Quan...

Страница 46: ...he file name the end is an incremented numerically Length of the file maximum or selection of the number of samples per channel Measurement data prior to a trigger event may be included in the data recording The amount of data is defined as the Pre trigger samples The amount of data is set and determines the amount of time before the trigger event to include in the recording Speed The maximum spee...

Страница 47: ...e amount of data prior to a trigger event is configurable Access the trigger menu from the Home screen and the Trigger button Figure 9 1 is representative of the trigger configuration window 9 3 Triggering Triggering is based either on a single channel edges and thresholds combinations of analog channels or set digital signal states 9 3 1 Single analog channel trigger To use a single analog channe...

Страница 48: ...ed channel into account Edge Selection of the active edge of the channel in reference to the threshold Pre triggering only for start gives the acquisition time before the trigger appears 9 3 3 Multiple thresholds After selection of a trigger on a set of logic channels the window allows you to set the trigger under several conditions Then by pressing the various thresholds in front of their respect...

Страница 49: ...ggers 9 4 Trigger on Logic Channels Selecting Logic Channels as the trigger source changes the window to show conditions for logic channel triggering Each of the logic channels is configured as a 1 0 or X don t care Use the arrow keys to move through the logic input bits Triggering may be configured as either an AND condition or an OR condition This is applied to each channel Lastly the trigger ev...

Страница 50: ...CHAPTER 9 TRIGGERING RECORDINGS 40 Figure 9 6 Trigger type setup screen Figure 9 7 Logic Trigger Setup Screen ...

Страница 51: ...ue to show an alarm happened The digital port clears the alarm when the programmed condition is not met any longer and returns to 0V To configure the alarms open the setup menu from the home screen See Figure 10 1 At the bottom of the screen are the 4 alarms Each button opens the configuration dialog for that alarm See Figure 10 2 Figure 10 1 Alarms on Setup screen 10 1 Alarm status The status of ...

Страница 52: ...e desired signal by pressing the button listing a channel at the center of the dialog box Depending on the signal type 1 thresholds may be set The selected threshold is show at the top of the dialog To set the trigger as a window the channels combination configuration must be used See Section 10 3 10 3 Analog signal combination alarm More complex triggering based on windows and combinations of sig...

Страница 53: ...nnels option Following the typical convention of a 1 0 and X to denote true false and dont t care respectively is used to set the digital patter to trigger on Also using the AND or OR conditions select when the trigger occurs With the AND condition all signals defined must be true for the Alarm to trigger In the OR case any valid signal excluding the X signals will trigger an alarm ...

Страница 54: ...nalog combination trigger Figure 10 7 Digital trigger 10 5 Alarm on recording start Trigger Acquisition An alarm is also available for signaling the start of a recording Select the Trigger Acquisition option to enable this type of alarm ...

Страница 55: ...CHAPTER 10 ALARMS 45 Figure 10 8 Trigger on alarm Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com ...

Страница 56: ...me of the signals 13 Logic channel 1 19 Function K2 25 Logic channel 2 6 Function K3 12 Logic channel 3 18 Function K4 24 Logic channel 4 5 Ground 11 Logic channel 5 17 Ground 23 Logic channel 6 4 Ground 10 Logic channel 7 16 9 15V 0 2A power 22 Logic channel 8 3 Ground 9 Logic channel 9 15 Alarm C 21 Logic channel 10 2 Alarm D 8 Logic channel 11 14 Alarm A 20 Logic channel 12 1 Alarm B 7 Function...

Страница 57: ...abled by the up down arrows beside the text listing the number of channels then pins 13 25 12 and 24 will be active They become channels 1 4 respectively Note Logic inputs are 3 3V TTL level and 24V tolerant Figure 11 2 Logic channels on the F t screen 1 Channel number color and arrows to change channel 2 Channel count 3 Enable logic channels 4 Connector red selected channel 5 Additional pin infor...

Страница 58: ...uration screen for a single channel by pressing the channel ID i e K1 Configuration of a single channel is done via screens similar to Figure 11 5 Figure 11 4 Timing function channels Figure 11 5 Single Timing function setup screen 11 4 Alarm outputs Finally the Alarm signals are also present on the Logic connector A B C and D Pins 14 1 15 and 2 respectively Their setup and use is described in Sec...

Страница 59: ...h disk When erasing a folder all files in this directory will be erased too 12 1 Setup Files Setup configurations are loaded and saved from the Home Setup menu The configuration may be changed via the 3 buttons in the upper righthand corner of the screen Default sets up the appliance in standard configuration Load from disk loads a configuration from a file in the internal flash disk or an USB sti...

Страница 60: ...te the selected folder or file 6 Close the window 7 Folder navigation and location window 8 File view and selection window Figure 12 1 File View Screen 12 1 3 Load setup files To load a configuration press the Select the directory and then the file to load and click Load 12 2 Recordings files Saved recordings are transferable between internal storage and USB Recordings are saved to internal storag...

Страница 61: ...P the DHCP checkbox is marked and the network address will be shown on the Network button shown on the Home screen For static IP configuration using parameters defined for the network see your local network administrator for details are set in the dialog Figure 13 1 LAN configuration button 13 2 VNC Use of the unit from another computer is available using VNC Virtual Network Computing This present...

Страница 62: ...ata acquisition files to a PC computer for viewing The SeframViewer software is provided on a CD ROM with the appliance You can use it to view the recorded files or convert it into xls or txt files It works under WINDOWS with Framework 2 0 Transfer of the files from the appliance to the PC computer USB peripheral device with the FTP protocol Launch the SeframViewer software or double click on a fi...

Страница 63: ... functions in SeframViewer by clicking on the last icon Help You can also directly create a file txt or xls by launching the command mode of Windows with the following line see the Options sub menu of the help Example C Program Files x86 SeframViewer seframviewer exe myfile rec x will create a xls file C Program Files x86 SeframViewer seframviewer exe myfile rec t will create a txt file Excel expo...

Страница 64: ...n the right button If you want manage your DAS240 using network please enter the IP address to establish the connection For every action including opening saving sending or refreshing configurations the left sliding menu makes you able to apply it Figure 13 5 DASLab 13 6 Modbus slave Modbus is a non proprietary communication protocol All Modbus frames are encapsulated into Ethernet frames it is ca...

Страница 65: ...ould enable or disable the server click on the radio button Modbus server state According to your preferences you are able to change the network port dedicated to the Modbus server To carry out that change to a successful conclusion you must disable the Modbus server change the port 502 by default and then restart the Modbus server 13 6 2 Mapping Modbus TCP Your Sefram DAS240 instrument share acqu...

Страница 66: ...rd Table 13 1 Modbus register map Discrete Inputs 0x08 DI1 0x14 DI12 Table 13 2 Register Mapping At address 0x09 28160 16 bits Value in float 1 40961 32 bits Logical data Logical values about the 12 logical channels are located in the discrete inputs from the address 0x08 Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com ...

Страница 67: ...dating the Internal Software The internal software is updated regularly with the latest evolutions These updates are available on our website http www sefram com en software updates html To update the software copy the file that will be provided on an USB stick Place it on the USB connector on the rear side of the unit Press the Setup key Then press the Software update key to enter the update Fina...

Страница 68: ...ations apply to the unit after 1 A temperature stabilization time of 15 minutes over an ambient temperature range of 23 C 5 C 2 Short correction operation performed before making measurement Specifications are subject to change without notice 58 ...

Страница 69: ...rating Temperature 0 C to 40 C 80 RH no condensation Storage Temperature 20 C to 60 C Auxiliary Display 10 TFT touchscreen LCD backlit 1024 x 600 dots Power Supply 15 V 4 A max with main adapter 100 240 VAC Interfaces 2 x USB host LAN 10 100 base T with RJ45 socket Battery Non removable Lithium ion Typical Battery Life 15 hours with standby mode 10 hours without stand by mode Safety Cat I 100 V ac...

Страница 70: ...le Max absolute value T 50 C Add 40 C T 40 90 C Corresponding U voltage according to the tables ThJ U 4 726 mV Programmed caliber 10 mV measurement range 5mV to 5mV The measurement inaccuracies below are max values the typical values are half to thrice as much The temperature measurement accuracy is the sum of several possible uncertainty causes Pl linearization accuracy Ps weld welding accuracy P...

Страница 71: ...iber 10mV see previous example A 4 Accuracy for voltage measurement 0 1 10mV 10µV 20µV A 5 Slope of J thermocouple 50µV C A 6 AccuracyPm Pm 20 50 0 4 C A 7 Total accuracy Pt 0 25 0 5 0 4 1 15 C A 8 A 3 Accuracy class class index This is one of the most important concepts of the CEI recommendation it tends to shorten the list of specifications To do so it introduces the concept of PREDICTIVE CLASS ...

Страница 72: ...C in the reference conditions 1 5C for the maximal resistance of the external measurement circuit 2C for parasite voltages And the excess should not be more than 2C 4C within the limits of the power supply source Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com ...

Страница 73: ...asurement line it is good to check that there is no voltage difference between them in order to prevent any shortcut If any doubt make a measurement with a voltmeter on a low resistance i e 1kΩ between the terminals If any important noise When using the battery connect the GND connection to the ground use the sampling period for each channel 20ms an appropriate capacity can be placed between the g...

Страница 74: ...64 ...

Страница 75: ...65 Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com ...

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