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PicoScope 3425 PC Oscilloscope

1. Aliasing An effect that can cause digital oscilloscopes to display fast moving waveforms incorrectly by showing spurious low frequency signals aliases that do not exist in the input To avoid this problem choose a sampling rate that is at least twice the frequency of the fastest changing input signal Analogue bandwidth All oscilloscopes have an upper limit to the range of frequencies at which they can measure accurately The analog bandwidth of an oscilloscope is defined as the frequency at which a displayed sine wave has half the power of the input sine wave or equivalently about 71 of the amplitude Block mode A sampling mode in which the computer prompts the oscilloscope to collect a block of data into its internal memory before stopping the oscilloscope and transferring the whole block into computer memory This mode of operation is effective when the input signal being sampled is high frequency Note To avoid aliasing se1 effects the maximum input frequency must be less than half the sampling rate Buffer size The size in samples of the oscilloscope buffer memory The buffer memory is used by the oscilloscope to temporarily store data before transferring it to the PC Common mode overflow The scope measures the difference between the positive and negative input voltages on each channel The voltage of each input with respect to ground does not affect the measurement as long as it does not exceed the common mode volt
2. 42 PicoScope 3425 PC Oscilloscope 3 2 8 22 ps3000_get_streaming_last_values short ps3000_get_streaming_last_values short handle GetOverviewBuffersMaxMin lpGetOverviewBuffersMaxMin This function is used to collect the next block of values while fast streaming 15 is running You must have called ps3000_run_streaming_ns 41i beforehand to set up fast streaming Applicability Fast streaming 151 mode only handle the handle of the required device lpGetOverviewBuffersMaxMin a pointer to the callback functionl 4A in your application that receives data from the streaming driver The actual number of data values returned per channel which may be less than max_samples if streaming where max_samples is a parameter passed to ps3000_run_streaming_ns 41h FALSE if one of the parameters is out of range ps3425 en Copyright 2007 Pico Technology Limited All rights reserved Programmer s reference 43 3 2 8 23 Callback function to copy data to buffer void my_get_overview_buffers short x overviewBuffers short overflow unsigned long triggeredAt short triggered short auto_stop unsigned long nValues This is the callback function in your application that receives data from the driver in fast streaming 181 mode You pass a pointer to this function to ps3000_get_streaming_last_values 421 which then calls it back when the data is ready Your c
3. PicoScope 3425 PC Oscilloscope User s Manual ps3425 en 2 Copyright 2007 Pico Technology Limited All rights reserved Contents i Contents VINtro DECHE ee ee ee 1 Re UI TT 1 2 Minimum PC requirements EE 1 3 Safety information eceseseseesseeesseeeteeeseeeeeeseeesseesseeseeesscesseeeceessceeseesseeesseesseeaseasseeaseeeneees 2 4 Safety symbols s sesssssseseresseserereeserereeseseresseserersesererseseserenseserereesesereesesererseserereeserererseserereeserenee 3 ent 3 6 e OM EE 3 7 EE 4 8 Company details scescscesceeseeseeeseeeeseesseeeaceassceesenesseasseesseesscessacesceesceesaeeeseeeseeasseeaseeeasees 5 2 Product information egene Eeer Age 6 1 P ck contents eege hosted gege ENEE EENS 6 2 Installation instr UC OAS e e ea aa osevadsanadcssanenies aae a E RE aeiaai 6 3 Connector diagrams ENER 7 4 Connecting the oscilloscope sseseessessessesssesssssseeseeresresresresresrenreneenteseereeneresresresreneeneeneereenees 8 eegene ee ee 9 6 What is a differential oscilloscope s ssssesssesssereseseresesesesesesesenesenesenesesrsnsnererenesereresesesesene 10 7 Overflow indicators erea aaiae ccisds is Ed sacsseassizcanss cvdssaisavsasdsuecdshasvssoubusossdianduvncasag nuadendavvies 11 RE eebe 11 9 Resolution embanessesccccccsciecscsccctccsececcscdssccucecssscececosausasseveccogaseseseeecesdubsesscsesetesecedsuvecccoacsoesees lt 11 3 Programme r s referente aiiisecissccietesse
4. The C example program shows how to use the fast streaming modeli in the driver with and without triggering 12 and demonstrates the auto stop feature It runs in console mode You will need to compile the following files that are supplied in the Examples ps3000 subdirectory of your PicoScope installation ps3000 h small ico streamingTests cpp streamingTests ico streamingTests rec streamingTestsResource h rename to resource h before compiling You will also need the following library for Microsoft C ps3000 1ib Microsoft Visual C 32 bit applications Ensure that the program directory contains a copy of ps3000 d11l from the PicoScope installation directory A Visual Studio 2005 VC8 project file faststreaming vcproj is provided 3 3 3 Visual Basic The Examples ps3000 subdirectory of your PicoScope installation contains the following files ps3000 vbp project file ps3000 bas procedure prototypes ps3000 frm form and program Note The functions which return a TRUE FALSE value return 0 for FALSE and 1 for TRUE whereas Visual Basic expects 65 535 for TRUE Check for gt 0 rather than TRUE ps3425 en Copyright 2007 Pico Technology Limited All rights reserved Programmer s reference 53 3 3 4 3 3 5 3 3 6 3 3 7 Delphi The program ps3000 dpr in the Examples ps3000 subdirectory of your PicoScope installation demonstrates how to operate Pico
5. Copyright 4 Current clamp adaptor 6 8 Data acquisition 15 DC coupling 11 Delphi programming 53 Device Manager 54 Differential oscilloscope 10 Dimensions 9 Driver 12 54 error codes 55 Electric shock risk 3 Email 5 EMC directive 89 336 EEC 3 EN61326 1 1997 Class B 3 Environmental conditions 9 Equipotentiality 3 Error codes 54 55 Excel macros 53 External trigger 12 25 26 Fast streaming mode 15 Fax 5 FCC notice 3 Fitness for purpose 4 Functions 17 ps3000_close_unit 50 ps3000_flash_led 24 ps3000_get_streaming_last_values 42 ps3000_get_streaming_values 44 ps3000_get_streaming_values_no_aggregation 46 ps3000_get_timebase 23 ps3000_get_times_and_values 40 ps3000_get_unit_info 21 ps3000_get_values 39 ps3000_open_unit 18 ps3000_open_unit_async 19 ps3000_open_unit_progress 20 ps3000_overview_buffer_status 48 ps3000_ready 37 ps3000_run_block 35 ps3000_run_streaming 36 ps3000_run_streaming_ns 41 ps3000_save_streaming_data 47 ps3000_set_channel 22 ps3000_set_trigger 25 ps3000_set_trigger2 26 ps3000_stop 38 ps3000SetAdvtTriggerChannelConditions 29 ps3000SetAdvtTriggerChannelDirections 31 ps3000SetAdvTriggerChannelProperties 27 ps3000SetAdvtTriggerDelay 34 ps3000SetPulseWidthQualifier 32 Copyright 2007 Pico Technology Limited All rights reserved ps3425 en 60 PicoScope 3425 PC Oscilloscope Functions 17 save streaming data callback 49 streaming data buffer callback
6. for more on data values Each sample of aggregated data is created by processing a block of raw samples The aggregated sample is stored as a pair of values the minimum and the maximum values of the block of raw samples ps3425 en Copyright 2007 Pico Technology Limited All rights reserved Programmer s reference 45 Applicability Fast streaming 151 mode only handle the handle of the required device start_time the time in nanoseconds relative to the trigger point of the first data sample required pbuffer_a_max pbuffer_a_min pointers to two buffers into which the function will write the maximum and minimum aggregated sample values from channel A EE pbuffer_b_max pbuffer_b_min pbuffer_c_max pbuffer_c_min pbuffer_d_max pbuffer_d_min asthe two parameters above but for channels B C and D ee overflow a pointer to where the function will write a bit field indicating whether the voltage on each of the input channels has overflowed thahaka jo ote t7tels ist s etto IDI Cc BIA IC BIA common mode GC overflow overflow triggerAt a pointer to where the function will write an index into the buffers The index is the number of the sample at the trigger reference point Valid only when triggered is TRUE triggered a pointer to a Boolean indicating that a trigger has occurred and triggerAt is valid no_of_values the number of values required noOfSample
7. Copyright 2007 Pico Technology Limited All rights reserved ps3425 en 32 PicoScope 3425 PC Oscilloscope 3 2 8 13 ps3000SetPulseWidthQualifier short ps3000SetPulseWidthQualifier short handle PNQ_CONDITIONS conditions short nConditions THRESHOLD_DIRECTION direction unsigned long lower unsigned long upper PULSE_WIDTH_TYPE type This function sets up pulse width qualification which can be used on its own for pulse width triggering or combined with other triggering to produce more complex triggers The pulse width qualifier is set by defining a conditions structure handle the handle of the required device conditions a pointer to a PWQ_ CONDITIONS structure specifying the conditions that should be applied to the trigger channel If conditions is NULL then the pulse width qualifier is not used nConditions should be set to 1 if conditions is non null otherwise 0 direction the direction of the signal required to trigger the pulse lower the lower limit of the pulse width counter upper the upper limit of the pulse width counter This parameter is used only when the type is set to PW_TYPE_IN_RANGE or PW_TYPE_OUT_OF_RANGE type the pulse width type one of these constants PW_TYPE_NONE do not use the pulse width qualifier PW_TYPE_LESS_THAN pulse width less than lower PW_TYPE_GREATER_THAN pulse width greate
8. from 0 to 100 100 implies that the operation is complete 1 if the driver successfully opens the unit 0 if opening still in progress 1 if the unit failed to open or was not found ps3425 en Copyright 2007 Pico Technology Limited All rights reserved Programmer s reference 21 3 2 8 4 ps3000_get_unit_info short ps3000_get_unit_info short handle char string short string_length short line This function writes oscilloscope information to a character string If the oscilloscope fails to open only line types O and 6 are available to explain why the last open unit call failed handle the handle of the device from which information is required If an invalid handle is passed the error code from the last unit that failed to open is returned string a pointer to the character string buffer in the calling function where the unit information string selected with line will be stored If a null pointer is passed no information will be written string_length the length of the character string buffer If the string is not long enough to accept all of the information only the first string_length characters are returned line an enumerated type specifying what information is required from the driver The length of the string written to the character string buffer string by the function O if one of the parameters is out of range or a null pointer is passed for string ine CStrin
9. 43 G Gain 12 Grounding 8 H High precision scopes 15 High speed sampling 13 IEC 61010 1 2001 3 Indicator overflow 11 Inputs 9 Installation 6 Intended use 1 L LED 24 Legal information 4 Liability 4 Linearity 9 M Macros in Excel 53 Mains voltages 2 Maximum input voltages 2 9 Measurement category 2 Memory in scope 13 Meter 1 Mission critical applications 4 Multi unit operation 16 N Noise 9 Normal mode 14 O Opening aunit 18 19 20 Operating environment 9 Oscilloscope probe 7 8 Overflow indicator 11 Oversampling 16 Overview buffer 48 P Pack contents 6 PC connection 9 PC Oscilloscope 1 56 PC requirements 1 Pico Technical Support 54 PicoLog software 12 55 picopp inf 12 picopp sys 12 PicoScope 3000 Series 1 16 54 55 PicoScope software 1 6 12 55 56 common mode overflow indicator 11 overflow indicator 11 Power supply 9 Pre trigger 12 Programming C 51 C 52 Dephi 53 Visual Basic 52 PWQ_CONDITIONS structure 33 R Repairs 2 Resolution Enhance 11 Resolution vertical 9 16 56 S Safety 2 Sampling rate 9 56 Screened cable 8 Signal generator 7 8 12 13 Single ended oscilloscope 10 Software error codes 54 Specifications 9 Spectrum analyser 1 56 Stopping sampling 38 Storage environment 9 Streaming mode 13 56 compatible 14 fast 15 normal 14 windowed 14 Support 4 T Technical assistance 5 Technical support 54 ps3425 en Copyrig
10. A typical USB 1 1 port supports a data transfer rate of 12 Mbps 12 megabits per second and is much faster than a serial port USB 2 0 USB Universal Serial Bus is a standard port that enables you to connect external devices to PCs A typical USB 2 0 port supports a data transfer rate that is 40 times faster than that supported by USB 1 1 USB 2 0 is backwards compatible with USB 1 1 Vertical resolution A value in bits indicating the degree of precision with which the oscilloscope can turn input voltages into digital values Calculation techniques can improve the effective resolution Voltage range The voltage range is the difference between the maximum and minimum voltages that can be accurately captured by the oscilloscope ps3425 en Copyright 2007 Pico Technology Limited All rights reserved Index 59 Index A AC coupling 11 AC DC control 56 AC DC coupling 12 22 Access 4 Accuracy 9 Adaptor 8 Address 5 Advanged triggering 27 29 31 32 34 Aggregation 15 41 44 Agilent VEE 53 Aliasing 16 56 Analogue bandwidth 9 56 API 17 B Bandwidth analogue 9 Block mode 12 13 16 35 56 BNC connector 7 8 BS EN 61010 1 2001 3 Buffer size 9 56 C C programming 51 C programming 52 Cable 8 Calibration 2 Callback 43 CE notice 3 Channel 12 22 25 26 Channels 9 11 Cleaning 2 Closing a unit 50 Common mode voltage 56 Compatible streaming mode 14 Compliance 9 Contact details 5
11. Limited All rights reserved Programmer s reference 23 3 2 8 6 ps3000_get_timebase short ps3000_get_timebase short handle short timebase long no_of_samples short short ER 22 long time_interval time_units oversample long max_samples This function discovers which timebases 57 are available on the oscilloscope You should set up the channels using ps3000_set_channel 22 first handle the handle of the required device timebase a code between 0 and the maximum timebase dependent on variant Timebase 0 is the fastest timebase timebase 1 is twice the time per sample of timebase 0 timebase 2 is four times etc no_of_samples the number of samples required This value is used to calculate the most suitable time unit to use time_interval a pointer to the time interval in nanoseconds between readings at the selected timebase If a null pointer is passed nothing will be written here time_units a pointer to the most suitable units that the results should be measured in This value should also be passed when calling ps3000_get_times_and_values 401 If a null pointer is passed nothing will be written here oversample the amount of oversample required An oversample of 4 would quadruple the time interval and quarter the maximum samples At the same time it would increase the effective resolution by one bit See Oversampling 111 for more details max_sam
12. Maximum sampling rate A figure indicating the maximum number of samples the oscilloscope is capable of acquiring per second Maximum sample rates are given in MS s megasamples per second The higher the sampling capability of the oscilloscope the more accurate the representation of the high frequencies in a fast signal Overview buffer A buffer in which the PicoScope 3000 Series driver temporarily stores data on its way from the scope device to the application s buffer PC Oscilloscope A measuring instrument consisting of a Pico Technology scope device and the PicoScope software It provides all the functions of a bench top oscilloscope without the cost of a display hard disk network adapter and other components that your PC already has PicoScope 3000 Series A PC Oscilloscope range comprising the PicoScope 3204 3205 3206 general purpose scopes the PicoScope 3223 and 3423 automotive scopes the PicoScope 3224 and 3424 high resolution scopes and the 3425 differential scope PicoScope software This is a software product that accompanies all our oscilloscopes It turns your PC into an oscilloscope spectrum analyser and meter display Signal generator This is a feature on an oscilloscope which allows a signal to be generated without an external input device being present The signal generator output is the BNC socket marked E on the oscilloscope If you connect a BNC cable between this and one of the channel inputs you can send a
13. callback function decides what to do with the data Applicability Fast streaming 151 mode only handle the handle of the required device lpCallbackFunc a pointer to the my_save_streaming_data ug callback function in your application that handles the saving of streaming data taBuffers a pointer to the data taBufferSize the size of the buffer in samples Copyright 2007 Pico Technology Limited All rights reserved ps3425 en 48 PicoScope 3425 PC Oscilloscope 3 2 8 27 ps3000_overview_buffer_status short ps3000_overview_buffer_status short handle short previous_buffer_overrun This function indicates whether or not the overview buffers used by ps3000_run_streaming_ns 4 have overrun If an overrun occurs you can choose to increase the overview_buffer_size argument that you pass in the next call to ps3000_run_streaming_ns 41 Applicability Fast streamingl 151 mode only handle the handle of the required device previous_buffer_overrun a pointer to a Boolean indicating whether the overview buffers have overrun Any non zero value indicates a buffer overrun o if the function was successful 1 if the function failed due to an invalid handle ps3425 en Copyright 2007 Pico Technology Limited All rights reserved Programmer s reference 49 3 2 8 28 Callback function to save data short my_save_streaming_data short dataBuffe
14. driver can support up to four oscilloscopes All modes 1 if the oscilloscope fails to open 0 if no oscilloscope is found gt 0 device handle if the device opened ps3425 en Copyright 2007 Pico Technology Limited All rights reserved Programmer s reference 19 3 2 8 2 ps3000_open_unit_async short ps3000_open_unit_async void This function opens a PicoScope 3000 Series PC Oscilloscope without waiting for the operation to finish You can find out when it has finished by periodically calling ps3000_open_unit_progress 20 until that function returns a non zero value The driver can support up to four oscilloscopes All modes 0 if there is a previous open operation in progress 1 if the call has successfully initiated an open operation Copyright 2007 Pico Technology Limited All rights reserved ps3425 en 20 PicoScope 3425 PC Oscilloscope 3 2 8 3 ps3000_open_unit_progress short ps3000_open_unit_progress short handle short progress_percent This function checks on the progress of ps3000_open_unit_async 191 All modes Use only with ps3000_open_unit_async 19 handle a pointer to a location in which the function will store the handle of the opened device 0 if no unit is found or the unit fails to open handle of device valid only if function returns TRUE progress_percent a pointer to an estimate of the progress towards opening the unit
15. if your are a PicoScope or PicoLog user If you are writing your own program refer to the driver error codes ee section Errorcode Meaning S More than 4 PicoScope 3000 Series oscilloscopes are opened on one machine It is not possible to use more than 4 oscilloscopes in the same application 2 The driver cannot allocate enough of the computer s memory to operate the oscilloscope Consult the system requirements 1 section for more information A PicoScope 3000 Series PC Oscilloscope s7i could not be found on your machine Make sure the software is installed before the oscilloscope is plugged into the USB socket and restart your computer 4 5 o0r6 There is a problem with the oscilloscope itself These problems could arise from configuration settings being corrupted or a firmware or hardware error 7 The operating system is not recent enough to support the PicoScope 3425 PC Oscilloscope Consult the system requirements 14 section for more information ps3425 en Copyright 2007 Pico Technology Limited All rights reserved Troubleshooting 55 4 2 Driver error codes This description of the driver error codes is aimed at those people who intend to write their own programs for use with the driver If the PicoScope or PicoLog software reports an error refer to the Troubleshooting s section A 50 PS3000_OK The oscilloscope is functioning correctly PS3000_MAX UNITS_OPENED Attempts have been made t
16. procedure for reading and displaying data in compatible streaming model 141 ee Open the oscilloscope using ps3000_open_unit 181 Select channel ranges and AC DC switches using ps3000_set_channel 22 Start the oscilloscope running using ps3000_run_streaming s 1 Transfer the block of data from the oscilloscope using ps3000_get_values 391 Display the data Repeat steps 4 and 5 as necessary Stop the oscilloscope using ps3000_stop 381 DOY U ee ps3425 en Copyright 2007 Pico Technology Limited All rights reserved Programmer s reference 15 3 2 4 6 Fast streaming mode Fast streaming mode is an advanced streaming mode 14 that can transfer data at speeds of a million samples per second or more depending on the computer s performance This makes it suitable for high speed data acquisition allowing you to capture very long data sets limited only by the computer s memory Fast streaming mode also provides data aggregation s 1 which allows your application to zoom in and out of the data with the minimum of effort Applicability Works with triggering 12 See Using fast streaming model vg for programming details 3 2 4 7 Using fast streaming mode This is the general procedure for reading and displaying data in fast streaming mode 15 Open the oscilloscope using ps3000_open_unit 181 Select channel ranges and AC DC switches using ps3000_set_channel 22 Set the trigger using p
17. ps3000_stop ag and ps3000_get_values A See Using block model for programming details Using block mode This is the general procedure for reading and displaying data in block mode i 1 Open the oscilloscope using ps3000_open_unit 13 2 Select channel ranges and AC DC coupling using ps3000_set_channel 2A ER Using ps3000_set_trigger 251 set the trigger if required 4 Using ps3000_get_timebase 23 select timebases until the required number of nanoseconds per sample is located 5 Start the oscilloscope running using ps3000_run_block 3s 6 Wait until the oscilloscope says it is ready using ps3000_ready 371 7 Transfer the block of data from the oscilloscope using ps3000_get_values 391 or ps3000_get_times_and_values ag 8 Display the data 9 Repeat steps 5 to 8 10 Stop the oscilloscope using ps3000_stop 381 Copyright 2007 Pico Technology Limited All rights reserved ps3425 en 14 PicoScope 3425 PC Oscilloscope 3 2 4 3 3 2 4 4 3 2 4 5 Streaming modes The streaming modes are alternatives to block mode 13 that can capture data without gaps between blocks In a streaming mode the computer prompts the PicoScope 3425 PC Oscilloscope to start collecting data The data is then transferred back to the PC without being stored in oscilloscope memory Data can be sampled with a period between 1 us and 60 s and the maximum number of samples is limited o
18. 12 k samples 256 k samples 128 k samples Differential voltage 104 Selectable AC or DC coupling Touch proof BNC connectors with 4 mm GND sockets 12 4 MQ on 100 mV to 5 V ranges 10 1 MQ on 10 V to 400 V ranges 12 pF 30 V on 100 mV to 5 V ranges 400 V on 10 V to 400 V ranges 400 V 400 V 600 V transient Measurement category rating CAT I Voltage ranges 58 100 mV 200 mV 500 mV 1 V 2 V 5V 10 V 20 V 50 V 100 V 200 V 400 V Accuracy Voltage 1 Time 50 ppm Operating environment Temperature range Humidity range Storage environment Temperature range Humidity range Other environmental conditions Power supply 20 C to 30 C for quoted accuracy 0 C to 40 C Minimum 5 RH non condensing Maximum 80 RH non condensing decreasing linearly to 50 at 40 C 20 C to 60 C 5 to 90 RH non condensing No pollution or only dry non conductive pollution 4 6 V to 5 25 V DC approx 500 mA Dry environments Altitude up to 2000 m Compatible with USB 1 1 From USB port USB 2 0 585 No external power supply required 255 mm x 170 mm x 40 mm approximately 10 0 in x 6 7 in x 1 6 in 920 g approximately 2 Ib Copyright 2007 Pico Technology Limited All rights reserved ps3425 en 10 PicoScope 3425 PC Oscilloscope 2 6 Whatisa differential oscilloscope The PicoScope 3425 is a differential PC Oscilloscope A differential oscilloscope m
19. 2 2 Installation instructions Important You must install the PicoScope software si before connecting a PicoScope 3425 PC Oscilloscope to your PC for the first time Install the software by following the steps in the quick start guide supplied with your oscilloscope You can then connect your oscilloscope to the PC There is no need for an additional power supply as the unit draws its power from the USB port Checking the installation Once the software has been installed ensure that the oscilloscope is connected to the PC and then start the PicoScope software The software should now display the voltage of any signal that is connected to the oscilloscope If you are using the differential cable and test probes supplied you should see a small 50 or 60 hertz noise signal in the oscilloscope window when you touch the test probes with your fingers See Connector diagrams 7 ps3425 en Copyright 2007 Pico Technology Limited All rights reserved Product information 7 2 3 Connector diagrams Front view 3425 Rear view 1 Ch A Input channel A As this is a differential oscilloscope 107 the channels have non standard input impedances and cannot be used with passive attenuated scope probes such as the x1 x10 probes supplied with conventional oscilloscopes 2 Ch B Input channel B Has the same characteristics as Ch A 3 Ch C Input channel C Has the same characteristics as Ch A 4 Ch D Input channel D Has the same chara
20. Scope 3000 Series PC Oscilloscopes 57 The file ps3000 inc contains procedure prototypes that you can include in your own programs Other required files are ps3000fm res ps3000fm dfm ps3000fm pas This has been tested with Delphi version 3 Excel 1 Load the spreadsheet ps3000 xls 2 Select Tools Macro 3 Select GetData 4 Select Run Note The Excel macro language is similar to Visual Basic The functions which return a TRUE FALSE value return 0 for FALSE and 1 for TRUE whereas Visual Basic expects 65 535 for TRUE Check for gt 0 rather than TRUE Agilent VEE The example function ps3000 vee is in the Examples ps3000 subdirectory of your PicoScope installation It uses procedures that are defined in ps3000 vh It was tested using Agilent VEE version 5 LabView The VI example in the Examples ps3000 subdirectory of your PicoScope installation shows how to access the driver functions using LabVIEW It was tested using version 6 1 of LabVIEW for Windows To use the example copy these files to your LabVIEW directory ps3000_fastStream vi ps3000_runBlock vi ps3000_runStream vi ps3000wrap c ps3000wrap dll You will also need this file from the installation directory PS3000 d1l Copyright 2007 Pico Technology Limited All rights reserved ps3425 en 54 PicoScope 3425 PC Oscilloscope 4 1 Troubleshooting Software error codes Consult this section
21. UE auto_stop a Boolean indicating whether streaming data capture has automatically stopped Any non zero value signifies TRUE nValues the number of values in each overview buffer Copyright 2007 Pico Technology Limited All rights reserved ps3425 en 44 PicoScope 3425 PC Oscilloscope 3 2 8 24 ps3000_get_streaming_values unsigned long ps3000_get_streaming_values short handle double start_time short pbuffer_a_max short pbuffer_a_min short pbhuffer_b_max short pbuffer_b_min short pbuffer_c_max short pbuffer_c_min short pbhuffer_d_max short pbuffer_d_min short overflow unsigned long triggerAt short triggered unsigned long no_of_values unsigned long noOfSamplesPerAggregate This function is used after the driver has finished collecting data in fast streaming mode Ms It allows you to retrieve data with different aggregation s iratios and thus zoom in to and out of any region of the data Before calling this function first capture some data in fast streaming mode stop fast streaming by calling ps3000_stop 381 then allocate sufficient buffer space to receive the requested data The function will store the data in your buffer with values in the range PS3000_MIN_VALUE to PS3000_MAX_VALUE The special value PS3000_LOST_DATA is stored in the buffer when data could not be collected because of a buffer overrun See Scaling
22. a trigger event occurs the oscilloscope may not contain valid data All modes handle the handle of the required device 0 if an invalid handle is passed 1 if successful ps3425 en Copyright 2007 Pico Technology Limited All rights reserved Programmer s reference 39 3 2 8 19 ps3000_get_values long ps3000_get_values short handle short buffer_a short buffer_b short buffer_c short buffer_d short overflow long no_of_values This function is used to get values in compatible streaming model 141 after calling ps3000_run_streaming s or in block mode d after calling ps3000_run_block s Compatible streaming model 141 and block model vi only Do not use in fast streaming models use ps3000_get_streaming_last_values 421 instead handle the handle of the required device buffer_a buffer_b buffer_c buffer_d pointers to the buffers that receive data from the specified channels A B C or D A pointer is unused if the oscilloscope is not collecting data from that channel If a pointer is NULL nothing will be written to it overflow a bit pattern indicating whether an overflow has occurred on a channel Bit O is the least significant bit The bit assignments are as follows i5 14 i3 12 i1 io 9 s 7te 5 4 3 2 110 Lol c Bal PD c Bata common mode differential overflow overflow no_of_values the number of data points to return In
23. age limit If this limit is exceeded a common mode overflow occurs and the scope will not measure the signal accurately PicoScope 6 shows a warning indicator vi when this happens Common mode voltage The common mode voltage of two points is the average voltage of the two points with respect to ground A differential oscilloscope accurately measures the voltage difference between its two inputs and ignores their common mode voltage as long as the input voltages with respect to ground remain within a defined range Outside this range the accuracy of the measurement cannot be guaranteed Differential oscilloscope A differential oscilloscope measures the voltage difference between two points regardless of the voltage of either point with respect to ground This is unlike a conventional oscilloscope which requires one of the two points to be at ground potential More details Iw ps3425 en Copyright 2007 Pico Technology Limited All rights reserved Glossary 57 Differential overflow Occurs when the difference between the positive and negative inputs on one channel exceeds the selected measuring range The result is an inaccurate measurement PicoScope 6 shows a warning indicator 1 when this happens Differential voltage limit The differential voltage the voltage difference between the positive and negative inputs on one channel must not exceed this limit or the oscilloscope may be permanently damaged
24. allback function should do nothing more than copy the data to another buffer within your application To maintain the best application performance the function should return as quickly as possible without attempting to process or display the data The function name my_get_overview_buffers is just for illustration When you write this function you can give it any name you wish The PicoScope driver does not need to know your function s name as it refers to it only by the address that you pass to ps3000_get_streaming_last_values 421 For an example of a suitable callback function see the C sample code sg included in your PicoScope installation Applicability Fast streamingl 151 mode only overviewBuffers a pointer to a location where ps3000_get_streaming_last_values 42 will store a pointer to its overview buffers s7 that contain the sampled data The driver creates the overview buffers when you call ps3000_run_streaming_ns 41 to start fast streaming overflow a bit field that indicates whether there has been a voltage overflow on any channel The bit assignments are as follows hahakot ote tz telsistst2i ito fDi c BIA common mode differential overflow overflow triggeredAt an index into the overview buffers indicating the sample at the trigger event Valid only when triggered is TRUE triggered a Boolean indicating whether a trigger event has occurred and triggeredAt is valid Any non zero value signifies TR
25. ata values Applicability Fast streaming vg mode only handle the handle of the required device start_time the time in nanoseconds of the first data sample required pbuffer_a pbuffer_b pbuffer_c pbuffer_d pointers to buffers into which the function will write the raw sample values from channels A B C and D overflow a pointer to where the function will write a bit field indicating whether the voltage on each of the input channels has overflowed i5 i4 i3 i2 itfio 9 s 7te s5 4 3 2 11 0 ID Cc BIA fot c BTA common mode differential overflow overflow triggerAt a pointer to where the function will write an index into the buffers The index is the number of the the sample at the trigger reference point Valid only when trigger is TRUE trigger a pointer to a Boolean indicating that a trigger has occurred and triggerAt is valid no_of_values the number of values required the number of values written to each buffer or 0 if a parameter was out of range ps3425 en Copyright 2007 Pico Technology Limited All rights reserved Programmer s reference 47 3 2 8 26 ps3000_save_streaming_data short ps3000_save_streaming_data short handle PS3000_CALLBACK_FUNC lpCallbackFunc short dataBuffers short dat taBufferSize This function sends all available streaming data to the my_save_streaming_data 49 callback function in your application Your
26. ch the trigger event is to take place This is scaled in 16 bit ADC counts at the currently selected range for that channel hysteresis the hysteresis that the trigger has to exceed before it will fire It is scaled in 16 bit counts channel the channel to which the properties apply thresholdMode either a level or window trigger Use one of these constants LEVEL 0 WINDOW 1 ps3425 en Copyright 2007 Pico Technology Limited All rights reserved Programmer s reference 29 3 2 8 11 ps3000SetAdvTriggerChannelConditions short ps3000SetAdvTriggerChannelConditions short handle TRIGGER_CONDITIONS conditions short nConditions This function sets up trigger conditions on the scope s inputs The trigger is set up by defining a TRIGGER_CONDITIONS a structure Each structure is the AND of the states of one scope input Applicability All modes handle the handle of the required device conditions a pointer to a TRIGGER_CONDITIONS structure specifying the conditions that should be applied to the current trigger channel If NULL triggering is switched off nConditions should be set to 1 if conditions is non null otherwise 0 0 if unsuccessful or if one or more of the arguments are out of range 1 if successful Copyright 2007 Pico Technology Limited All rights reserved ps3425 en 30 PicoScope 3425 PC O
27. cteristics as Ch A 5 Ground Can be used with the current clamp adaptor supplied to convert one or more of the differential inputs to single ended inputs Can also be used to ground the screen of the shielded twisted pair cable supplied The scope s ground is connected to the PC s ground through the USB cable You MUST NOT rely on the scope s ground as a protective safety ground 6 LED Lights up when the oscilloscope is first powered up switches off when the PicoScope software begins to run and then flashes while the oscilloscope is capturing data 7 USB port Compatible with USB si 1 1 and USB 2 0 ports Copyright 2007 Pico Technology Limited All rights reserved ps3425 en PicoScope 3425 PC Oscilloscope 2 4 Connecting the oscilloscope The oscilloscope is supplied with the following cables and adaptors BNC plug BNC socket BNC plug to scope to scope N VS Ko probe Grounding plug to scope La Positive plug _ Negative plug ri Grounding plug to scope TA038 Current clamp adaptor TA039 Screened twisted pair cable TAO38 Current clamp adaptor Use this adaptor to connect a current clamp to the oscilloscope First fit the adaptor to one of the BNC inputs on the oscilloscope s front panel then insert the adaptor s grounding plug into one of the ground sockets on the front panel It is important to ground the current clamp using the procedure just described Most c
28. e If an external trigger is enabled the range is fixed at 20V direction use PS3000_RISING 0 Or PS3000_FALLI 1 delay specifies the delay as a percentage of the requested number of data points between the trigger event and the start of the block It should be in the range 100 to 100 Thus 0 means that the trigger event is at the first data value in the block and 50 means that it is in the middle of the block If you wish to specify the delay as a floating point value use ps3000_set_trigger2 2 1 instead auto_trigger_ms the delay in milliseconds after which the oscilloscope will collect samples if no trigger event occurs If this is set to zero the oscilloscope will wait for a trigger indefinitely 0 if one of the parameters is out of range 1 if successful Copyright 2007 Pico Technology Limited All rights reserved ps3425 en 26 PicoScope 3425 PC Oscilloscope 3 2 8 9 ps3000_set_trigger2 short ps3000_set_trigger2 short handle short source short threshold short direction float delay short auto_trigger_ms This function is used to enable or disable triggering and its parameters It has the same behaviour as ps3000_set_trigger 251 except that the delay parameter is a floating point value Applicability Triggering is available in block models and fast streaming mode 157 only handle the handle of the required device source
29. e hardware resolution of the oscilloscope is 12 bits but you can obtain an effective resolution of up to 16 bits using the Resolution Enhance feature built in to the PicoScope software See the PicoScope 6 User s Guide for details Copyright 2007 Pico Technology Limited All rights reserved ps3425 en 12 PicoScope 3425 PC Oscilloscope 3 1 3 2 3 2 1 3 2 2 3 2 3 Programmer s reference Driver The Windows XP Vista 32 bit driver picopp sys is installed under the control of a Setup Information File picopp inf Once you have installed the PicoScope and PicoLog software Windows will automatically install the driver when you plug in the PicoScope 3425 PC Oscilloscope for the first time Programming with the PicoScope 3000 Series The ps3000 d11 library in your PicoScope installation directory allows you to program a PicoScope 3425 oscilloscope using standard C function calls 17 A typical program for capturing data consists of the following steps Open wg the scope unit est up the input channels with the required voltage ranges 121 and coupling mode 12 Set up triggering 121 Start capturing data See Sampling modes 1s for a more detailed discussion of programming Wait until the scope unit is ready Copy data to a buffer Stop capturing data Close the scope unit Numerous sample programs e are installed with your PicoScope software These show how to use the function
30. easures the voltage difference between two points regardless of the voltage of either point with respect to ground This is unlike a conventional single ended oscilloscope which requires one of the points to be at ground potential For example suppose that you want to measure the output voltage of a transformer with a grounded centre tap as in the diagram below VP L w A single ended oscilloscope can only measure a signal with reference to ground so you need to connect the scope s ground clip to the centre of the secondary You can then measure either V or Vy with respect to ground but not the total voltage across the secondary The diagram below shows a single ended scope connected between V and ground VI UE With a differential oscilloscope you can directly measure the secondary voltage by connecting the positive probe to V and the negative to V This is shown in the diagram below A ground connection is not essential although it is a good idea to use a shielded cable grounded at one end in order to prevent electromagnetic noise coupling into the cable Single ended oscilloscope YP e m A VN Differential oscilloscope Differential oscilloscopes have many other applications where the voltage to be measured is not referenced to ground or where it is not desirable to connect the scope ground to the ground of the device under test ps3425 en Copyright 2007 Pico Technology Limited All right
31. ee Oversampling 11 for details time_indisposed_ms a pointer to the approximate time in milliseconds over which the ADC will collect data If a trigger is set it is the amount of time the ADC takes to collect a block of data after a trigger event calculated as sample interval x number of points required Note The actual time may differ from computer to computer depending on how fast the computer can respond to I O requests 0 if one of the parameters is out of range 1 if successful Copyright 2007 Pico Technology Limited All rights reserved ps3425 en 36 PicoScope 3425 PC Oscilloscope 3 2 8 16 ps3000_run_streaming short ps3000_run_streaming sh sh DE DE long sh This fun OTA hand le samp le _interval_ms max_samples windowed ction tells the oscilloscope to start collecting data in compatible streaming model 141 If this function is called when a trigger has been enabled the trigger settings will be ignored For faster streaming use ps3000_run_streaming_ns 41 instead Applicability Compatible streaming 141 mode only le the handle of the required device le interval_ms the time interval in milliseconds between data points This can be no shorter than 1 ms max_samples the maximum number of samples that the driver is to store This can be no greater than 60 OOO It is the caller s responsibility to retrieve data before the o
32. et short handle THRESHOLD_DI D ECTION channel tAdvTriggerChannelDirections THRESHOLD_1 THRESHOLD ECTION channel THRESHOLD_ LA ECTION channelB Cc D ECTION channel SON THRESHOLD EE EI EI VK Eu Vi mm D D Od ECTION ext This function sets the direction of the trigger for each channel Applicability All modes handle the handle of the required device channelA channelB channelC channelD all specify the direction in which the signal must pass through the threshold to activate the trigger The allowable values for a D ESHOLD DIRECTION variable are listed in the table below t not used 0 if unsuccessful or if one or more of the arguments are out of range 1 if successful THRESHOLD_DIRECTION constants ABOVE BELOW RISING F R ALLING ISING_OR_FALLI INSIDE OUTSIDE ENTER EXIT ENTER_OR_EXIT NONE NG for gated triggers above a threshold for gated triggers below a threshold for threshold triggers rising edge for threshold triggers falling edge for threshold triggers either edge for window qualified triggers inside window for window qualified triggers outside window for window triggers entering the window for window triggers leaving the window for window triggers either entering or leaving the window no trigger
33. g returned Example PS3000_DRIVER_VERSION The version number of the DLL 1 0 O used by the oscilloscope driver 2 D VERSION The type of USB connection thatJ 1 1 or is being used to connect the s0 oscilloscope to the computer e attached oscilloscope The variant of PicoScope 3000 j 3425 PC Oscilloscope that is attached to the computer the oscilloscope 5 e calibration date of the 210ct07 oscilloscope PS3000_ERROR_CODE One of the Error codesl s55 man Copyright 2007 Pico Technology Limited All rights reserved ps3425 en 22 PicoScope 3425 PC Oscilloscope 3 2 8 5 ps3000_set_channel short ps3000_set_channel short handle short channel short enabled short de short range Specifies if a channel is to be enabled the AC DC coupling ee mode and the input range handle the handle of the required device channel an enumerated type Use PS3000_CHANNEL_A 0 or PS3000_CHANNEL_B 1 enabled specifies if the channel is active TRUE active FALSE inactive dc specifies the AC DC couplingls mode TRUE DC FALSE AC range a code between 1 and 10 See the table below 0 if unsuccessful or if one or more of the arguments are out of range 1 if successful Code Enumeration Range 6 v av __ s EECH 9 psow EELER ps3425 en Copyright 2007 Pico Technology
34. h Do not use chemical cleaners Make sure that the instrument is completely dry before using again ps3425 en Copyright 2007 Pico Technology Limited All rights reserved Introduction 3 1 4 Safety symbols Symbol 1 Caution risk of electric shock This symbol indicates that a safety hazard exists on the indicated connections if you do not take correct precautions Ensure that you read in detail all safety documentation associated with the product before using it Symbol 2 Equipotentiality This symbol indicates that the indicated connectors are all at the same potential i e are shorted together You must therefore take necessary precautions to avoid applying a potential across the indicated terminals as this may result in a large current causing damage to the product and connected equipment 1 5 FCC notice This equipment has been tested and found to comply with the limits for a Class A digital device pursuant to Part 15 of the FCC Rules These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instruction manual may cause harmful interference to radio communications Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be req
35. hnology Limited and PicoScope are internationally registered trademarks ps3425 en Copyright 2007 Pico Technology Limited All rights reserved 1 8 Company details You can obtain technical assistance from Pico Technology at the following address Address Pico Technology James House Colmworth Business Park Eaton Socon St Neots PE19 8YG United Kingdom Phone 44 0 1480 396 395 Fax 44 0 1480 396 296 Email Technical Support support picotech com Sales sales picotech com Web site www picotech com Copyright 2007 Pico Technology Limited All rights reserved ps3425 en PicoScope 3425 PC Oscilloscope Product information 2 1 Pack contents The PicoScope 3425 pack contains the following items Reorder code Description Quantity PRO90 PicoScope 3425 Differential PC Oscilloscope 1 M1106 USB cable for use with USB 1 1 and USB 2 0 ports 1 TA039 Screened twisted pair lead 1 3 metre 4 TA038 Current clamp adaptor 4 TAOO1 Black test probe 1 TA002 Red test probe 1 TA005 Black dolphin clip 4 TA006 Red dolphin clip 4 DO115 Quick Start Guide 1 DIO25 PicoScope software and reference CD 1 The accessories supplied with the PicoScope 3425 are rated for safe working at the maximum voltages stated in the Specifications o For your safety if you use your own accessories with this oscilloscope you must ensure that they are rated for the voltage you are measuring
36. ht 2007 Pico Technology Limited All rights reserved Index Telephone 5 Test probes 6 Threshold voltage 12 Time interval 16 Timebase 23 35 56 Trademarks 4 TRIGGER_CHANNEL_PROPERTIES structure 28 TRIGGER_CONDITIONS structure 30 Triggering 12 25 26 U Upgrades 4 Usage 4 USB 1 9 56 cable 6 hub 16 port 54 V Vertical resolution 9 16 Viruses 4 Visual Basic programming 52 Voltage range 9 56 W Website 5 Weight 9 Windowed mode 14 61 Copyright 2007 Pico Technology Limited All rights reserved ps3425 en 63 Copyright 2007 Pico Technology Limited All rights reserved ps3425 en Pico Technology Ltd James House Colmworth Business Park Eaton Socon St Neots PE19 8YG United Kingdom Tel 44 0 1480 396 395 Fax 44 0 1480 396 296 Web www picotech com ps3425 en 2 7 12 07 Copyright 2007 Pico Technology Limited All rights reserved
37. ility Pico Technology and its agents shall not be liable for any loss damage or injury howsoever caused related to the use of Pico Technology equipment or software unless excluded by statute Fitness for purpose As no two applications are the same Pico Technology cannot guarantee that its equipment or software is suitable for a given application It is your responsibility therefore to ensure that the product is suitable for your application Mission critical applications This software is intended for use on a computer that may be running other software products For this reason one of the conditions of the licence is that it excludes use in mission critical applications for example life support systems Viruses This software was continuously monitored for viruses during production but you are responsible for virus checking the software once it is installed Support If you are dissatisfied with the performance of this software please contact our technical support staff who will try to fix the problem within a reasonable time If you are still dissatisfied please return the product and software to your supplier within 28 days of purchase for a full refund Upgrades We provide upgrades free of charge from our web site at www picotech com We reserve the right to charge for updates or replacements sent out on physical media Trademarks Windows is a trademark or registered trademark of Microsoft Corporation Pico Tec
38. ion ps3425 en Copyright 2007 Pico Technology Limited All rights reserved Programmer s reference 3 2 8 Functions The PicoScope 3000 Series API exports the following functions for you to use in your own applications ps3000_open_unitl 1A ps3000_open_unit_asyncl 191 ps3000_open_unit_progress 207 ps3000_get_unit_infolat ps3000_set_channel 224 ps3000_get_timebase 231 ps3000_flash_led 24 ps3000_set_trigger 251 ps3000_set_trigger2 2 ps3000SetAdvTriggerChannelProperties 2 ps3000SetAdvTriggerChannelConditions zg ps3000SetAdvTriggerChannelDirections 31 ps3000SetPulseWidthQualifier 321 ps3000SetAdvTriggerDelay 41 ps3000_run_blocklss1 ps3000_run_streaming s ps3000_ready 3 ps3000_ stop zg ps3000_get_values s ps3000_get_times_and_values 4 ps3000_run_streaming_ns 411 ps3000_get_streaming_last_values 42 ps3000_get_streaming_values 441 ps3000_get_streaming_values_no_aggregation 46 ps3000_save_streaming_data 4 ps3000_overview_buffer_status di ps3000_close_unit so The following user defined functions are also described Callback function to copy data to buffer 47 Callback function to save data 17 Copyright 2007 Pico Technology Limited All rights reserved ps3425 en 18 PicoScope 3425 PC Oscilloscope 3 2 8 1 ps3000_open_unit short ps3000_open_unit void This function opens a PicoScope 3000 Series PC Oscilloscope The
39. ldest values are overwritten windowed if this is 0 only the values taken since the last call to ps3000_get_values 3 i are returned If this is 1 the number of values requested by ps3000_get_values 3 i are returned even if they have already been read by ps3000_get_values 3 1 if streaming has been enabled correctly 0 if a problem occurred or a value was out of range ps3425 en Copyright 2007 Pico Technology Limited All rights reserved Programmer s reference 37 3 2 8 17 ps3000_ready short ps3000_ready short handle This function checks to see if the oscilloscope has finished the last data collection operation Block model only Does nothing if the oscilloscope is in streaming mode 141 Seit handle the handle of the required device 1 if ready The oscilloscope has collected a complete block of data or the auto trigger timeout has been reached 0 if not ready An invalid handle is passed or the oscilloscope is in streaming mode or the scope is still collecting data in block mode 1 if device not attached The endpoint transfer fails indicating that the unit may well have been unplugged Copyright 2007 Pico Technology Limited All rights reserved ps3425 en 38 PicoScope 3425 PC Oscilloscope 3 2 8 18 ps3000_stop short ps3000_stop short handle Call this function to stop the oscilloscope sampling data If this function is called before
40. lopment environments C There are two C example programs one is a simple GUI application and the other is a more comprehensive console mode program that demonstrates all of the facilities of the driver The GUI example program is a generic Windows application that is it does not use Borland AppExpert or Microsoft AppWizard To compile the program create a new project for an Application containing the following files from the Examples ps3000 subdirectory of your PicoScope installation ps3000 c ps3000 rc and a ps3000bc lib Borland 32 bit applications or ps3000 1ib Microsoft Visual C 32 bit applications The following files must be in the compilation directory ps3000 rch ps3000 h and the following file must be in the same directory as the executable ps3000 d11l The console example program is a generic windows application that is it does not use Borland AppExpert or Microsoft AppWizard To compile the program create a new project for an Application containing the following files ps3000con c and ps3000bc 1ib Borland 32 bit applications e ps3000 1ib Microsoft Visual C 32 bit applications The following file must be in the compilation directory ps3000 h and the following file must be in the same directory as the executable ps3000 d11l Copyright 2007 Pico Technology Limited All rights reserved ps3425 en 52 PicoScope 3425 PC Oscilloscope 3 3 2 C
41. may cause physical damage Mains voltages and measurement category The PicoScope 3425 PC Oscilloscope is designed only for CAT I measurements as defined by BS EN61010 1 2001 which permits measurements on circuits that are not directly connected to the mains line power The oscilloscope is not designed for measurements on CAT II III or IV circuits The PicoScope 3425 PC Oscilloscope must not be directly connected to the mains line power Failure to heed this warning may lead to injury or death Safety grounding The PicoScope 3425 PC Oscilloscope connects directly to the ground of a computer through the USB cable provided This connection is intended only to minimise interference and therefore you must not rely on it as a protective safety ground Do not connect the ground sockets 7 on the front panel to any source other than ground If in doubt use a meter to check that there is no significant AC or DC voltage between the oscilloscope s ground socket and point to which you intend to connect it Failure to check may cause damage to your computer or injury to yourself and others Repairs The oscilloscope contains no user serviceable parts Repair or calibration of the oscilloscope requires specialised test equipment and must only be performed by Pico Technology Cleaning and decontamination Remove all connections from the unit Clean the external surfaces of the oscilloscope with a soft damp clot
42. n of 12 bits but the oscilloscope driver normalises all readings to 16 bits This enables it to take advantage of noise reduction from oversampling 11i when this is enabled The following table shows the relationship between the reading from the driver and the voltage of the signal cael 32 768 Indicates a buffer overrun in fast streaming 151 mode OO Zero volts PS3000_LOST_DATA PS3000_MIN_VALUE 32 767 Negative full scale PS3000_MAX_VALUE 32 767 Positive full scale Combining oscilloscopes It is possible to collect data using up to four PicoScope 3000 Series PC Oscilloscopes si at the same time Each oscilloscope must be connected to a separate USB port If a USB hub is used it must be a powered hub The ps3000_open_unit e function returns a handle to an oscilloscope All the other functions require this handle for oscilloscope identification For example to collect data from two oscilloscopes at the same time handlel handle2 ps3000_open_unit ps3000_open_unit ps3000_set_channel handlel set up unit 1 ps3000_run_block handlel ps3000_set_channel handle2 s set up unit 2 ps3000_run_block handle2 ready FALSE while not ready ready ps3000_ready handlel ready amp ps3000_ready handle2 ps3000_get_values handlel ps3000_get_values handle2 Note It is not possible to synchronise the collection of data between oscilloscopes that are being used in combinat
43. nly by the amount of free space on the PC s hard disk There are two streaming modes Compatible streaming mode 141 Fast streaming models Compatible streaming mode Compatible streaming mode is a basic streaming mode 147 that works with all scope units at speeds from one sample per minute to a thousand samples per second The oscilloscope s driver transfers data to a computer program using either normal or windowed mode In normal mode any data collected since the last data transfer operation is returned in its entirety Normal mode is useful if the computer program requires fresh data on every transfer In windowed mode a fixed number of samples is returned where the oldest samples may have already been returned before Windowed mode is useful when the program requires a constant time period of data Once the oscilloscope is collecting data in streaming mode any setup changes for example changing a channel range or AC DC s setting will cause a restart of the data stream The driver can buffer up to 32 K samples of data per channel but the user must ensure that the ps3000_get_values 391 function is called frequently enough to avoid buffer overrun See Using compatible streaming model 141 for programming details Does not support triggering 12 gt The ps3000_get_times_and_values ag function will always return FALSE 0 in streaming mode Using compatible streaming mode This is the general
44. o open more than PS3000_MAX_UNITS 2 PS3000_MEM_FAIL Not enough memory could be allocated on the host machine PS3000_NOT_FOUND An oscilloscope could not be found PS3000_FW_FAIL Unable to download firmware 5 PS3000_NOT_RESPONDING The oscilloscope is not responding to commands from the PC PS3000_CONFIG_FAIL The configuration information in the oscilloscope has become corrupt or is missing SP2 or Vista a ie The operating system is not Windows XP Copyright 2007 Pico Technology Limited All rights reserved ps3425 en 56 PicoScope 3425 PC Oscilloscope Glossary AC DC control Each channel can be set to either AC coupling or DC coupling With DC coupling the voltage displayed on the screen is equal to the true voltage of the signal across the differential inputs With AC coupling any DC component of the signal is filtered out leaving only the variations in the signal the AC component Aggregated values In fast streaming model the PicoScope 3000 57 driver can use a method called aggregation to reduce the amount of data your application needs to process This means that it replaces a number of consecutive raw samples with a pair of values which are the minimum and maximum values of all the raw samples You can set the aggregation parameter when you call ps3000_run_streaming_ns 41 for real time capture and when you call ps3000_get_streaming_values 4 to obtain post processed data
45. ow has occurred on a channel Bit O is the LSB The bit assignments are as follows 15 14 13 12 11 i0 9 s 7 e 5 4 3 2 11 0 ID C BIA DI cCIBIA_ common mode differential overflow overflow time_units which can be one of PS3000_Fs 0 femtoseconds PS3000_PS 1 picoseconds PS3000_NS 2 nanoseconds default PS3000_US 3 microseconds PS3000_MS 4 milliseconds or PS3000_S 5 seconds no of values the number of data points to return In streaming mode this is the maximum number of values to return The actual number of data values per channel returned which may be less than no_of_values if streaming 0 if one or more of the parameters are out of range or if the times will overflow with the time_units requested Use ps3000_get_timebase 23 to acquire the most suitable time_units ps3425 en Copyright 2007 Pico Technology Limited All rights reserved Programmer s reference 41 3 2 8 21 ps3000_run_streaming_ns short ps3000_run_streaming_ns short handle unsigned long sample_interval PS3000_TIME UNITS time_units unsigned long max_samples short auto_stop unsigned long noOfSamplesPerAggregate unsigned long overview_buffer_size This function tells the scope unit to start collecting data in fast streaming mode 161 The function returns immediately without waiting for data to be captured After calling this function you should next call ps3000_get_s
46. ples a pointer to the maximum samples available The maximum samples may vary depending on the number of channels enabled the timebase chosen and the oversample selected If this pointer is null nothing will be written here 1 if all parameters are in range 0 on error Copyright 2007 Pico Technology Limited All rights reserved ps3425 en 24 PicoScope 3425 PC Oscilloscope 3 2 8 7 ps3000_flash_led short ps3000_flash_led short handle Flashes the LED on the front of the oscilloscope three times and returns within one second All modes handle the handle of the required device 1 if a valid handle is passed 0 if handle is invalid ps3425 en Copyright 2007 Pico Technology Limited All rights reserved Programmer s reference 25 3 2 8 8 ps3000_set_trigger short ps3000_set_trigger short handle short source short threshold short direction short delay short auto_trigger_ms This function is used to enable or disable triggering and its parameters Triggering is available in block mode sgd and fast streaming mode al handle the handle of the required device source specifies where to look for a trigger Use PS3000_CHANNEL_A 0 PS3000_ CHANNEL P PS3000_CHANNEL_C 2 PS3000_CHANNEL PS3000_NONE 5 threshold the threshold for the trigger event This is scaled in 16 bit ADC counts at the currently selected rang
47. r short noOfBuffers This is a callback function in your application that receives data from ps3000_save_streaming_data 47 The function name my_save_streaming_data is just for illustration When you write this function you can give it any name you wish The PicoScope driver does not need to know your function s name it refers to it only by the address that you pass to ps3000_save_streaming_data 42 Applicability Fast streamingl 151 mode only dataBuffer a pointer to the buffer where the values are stored noOfBuffers tells your function how many buffers there are Copyright 2007 Pico Technology Limited All rights reserved ps3425 en 50 PicoScope 3425 PC Oscilloscope 3 2 8 29 ps3000_close_unit short ps3000_close_unit short handle Shuts down a PicoScope 3425 oscilloscope Applicability All modes handle the handle returned by ps3000_open_unit 181 of the oscilloscope being closed 0 if not 1 if a valid handle is passed ps3425 en Copyright 2007 Pico Technology Limited All rights reserved 3 3 3 3 1 Programmer s reference 51 Programming examples Programming examples are optionally available when you install PicoScope 5 Select the Custom installation option and then enable Programming Examples selecting either the whole tree or just the examples you are interested in There are examples for the following languages and deve
48. r than lower PW_TYPE_IN_RANGE pulse width between lower and upper PW_TYPE_OUT_OF_RANGE pulse width not between lower and upper 0 if unsuccessful or if one or more of the arguments are out of range 1 if successful ps3425 en Copyright 2007 Pico Technology Limited All rights reserved Programmer s reference 33 3 2 8 13 1 PWQ_CONDITIONS structure A structure of this type is passed to ps3000SetPulseWidthQualifier 321 in the conditions argument to specify the pulse width qualifier conditions and is defined as follows typedef struct tPwqConditions TRIGGER_STATE channelA TRIGGER_STATE channelB TRIGGER_STATE channel R D 1 TRIGGER_STATE channel TRIGGER_STATE externa PWO CONDITIONS Applicability Pulse width qualified triggering channelA channelB channelC channelD the type of condition that should be applied to each channel Use these constants CONDITION_DONT_CARE 0 CONDITION_TRUE 1 CONDITION_FALSE 2 external not used Copyright 2007 Pico Technology Limited All rights reserved ps3425 en 34 PicoScope 3425 PC Oscilloscope 3 2 8 14 ps3000SetAdvTriggerDelay short ps3000SetAdvTriggerDelay short handle unsigned long delay float preTriggerDelay This function sets the post trigger delay which causes capture to start a defined time af
49. rameters Applicability All modes handle the handle of the required device channelProperties apointertoa TRIGGER_CHANNEL_PROPERTIES structure describing the requested properties If NULL triggering is switched off nChannelProperties should be set to 1 if channelProperties is non null otherwise 0 autoTriggerMilliseconds the time in milliseconds for which the scope device will wait before collecting data if no trigger event occurs If this is set to zero the scope device will wait indefinitely for a trigger 0 if unsuccessful or if one or more of the arguments are out of range 1 if successful Copyright 2007 Pico Technology Limited All rights reserved ps3425 en 28 PicoScope 3425 PC Oscilloscope 3 2 8 10 1 TRIGGER_CHANNEL_PROPERTIES structure A structure of this type is passed to ps3000SetAdvTriggerChannelProperties 27 gt in the channelProperties argument to specify the trigger mechanism and is defined as follows typedef struct tTriggerChannelProperties short thresholdMajor short thresholdMinor unsigned short hysteresis short channel THRESHOLD MODE thresholdMode TRIGGER_CHANNEL PROPERTIES thresholdMa jor the upper threshold at which the trigger event is to take place This is scaled in 16 bit ADC counts at the currently selected range for that channel thresholdMinor the lower threshold at whi
50. s of the driver software in each of the modes available Voltage ranges It is possible to set the gain for each channel with the ps3000_set_channel 22 function This will give an input voltage range between 100 mV and 400 V AC DC coupling Using the ps3000_set_channel 221 function each channel can be set to either AC or DC coupling When AC coupling is used any DC component of the signal is filtered out Triggering PicoScope 3000 Series PC Oscilloscopes can either start collecting data immediately or be programmed to wait for a trigger event to occur In both cases you need to use the ps3000_set_trigger 25 function A trigger event can occur on any of the conditions available in the simple and advanced triggering modes Available in block model and fast streaming model15 only Calls to the ps3000_set_trigger 2 1 function have no effect in compatible streaming model 14 ps3425 en Copyright 2007 Pico Technology Limited All rights reserved Programmer s reference 13 3 2 4 3 2 4 1 3 2 4 2 Sampling modes PicoScope 3425 PC Oscilloscopes can run in various sampling modes Block mode 2 At the highest sampling rates the oscilloscope collects data much faster than a PC can read it To compensate for this the oscilloscope stores a block of data in an internal memory buffer delaying transfer to the PC until the required number of data points have been sampled S
51. s reserved 2 7 2 8 2 9 Product information 11 Overflow indicators PicoScope 6 the PC Oscilloscope software supplied with the PicoScope 3425 displays a yellow common mode overflow indicator for each channel when either the positive or the negative input voltage with respect to ground is outside the range stated in the Specifications 9 Exceeding the common mode range of the scope causes inaccurate measurements and can lead to severe signal distortion The red differential overflow indicator is used to warn when the differential voltage the difference between the positive and negative inputs on each channel exceeds the selected voltage range This condition causes clipping of the displayed signal Channel A differential overflow indicator Channel A common mode overflow indicator PicoScope 6 File Edit Vie Measurements Tools Help wlx s 10 01 ks K ae k n 100 pc v SR e om Moxy R yi moc M ER o off y joc N 0 306 5 306 10 31 15 31 20 31 25 31 30 31 35 31 19 388 H AS AC DC coupling Each channel can be set to use either AC or DC coupling When AC coupling is used any DC component of the signal below about 1 hertz is filtered out To change the coupling mode select AC or DC from the control on the oscilloscope toolbar of the PicoScope software The setting should be chosen to suit the characteristics of the input signal Resolution enhance Th
52. s3000_set_trigger 21 Start the oscilloscope running using ps3000_run_streaming_ns 41 Get a block of data from the oscilloscope using ps3000_get_streaming_last_values 421 Display or process the data If required check for overview buffer overruns by calling ps3000_overview_buffer_status 48 8 Repeat steps 5 to 7 as necessary or until auto_stop is TRUE 9 Stop fast streaming using ps3000_stop 381 10 Retrieve any part of the data at any time scale by calling ps3000_get_streaming_values adi 11 If you require raw data retrieve it by calling ps3000_get_streaming_values_no_aggregation 4 1 12 Repeat steps 10 to 11 as necessary 13 Close the oscilloscope by calling ps3000_close_unit at ie OY o Copyright 2007 Pico Technology Limited All rights reserved ps3425 en PicoScope 3425 PC Oscilloscope 3 2 5 3 2 6 3 2 7 Oversampling When the oscilloscope is operating at sampling rates less than the maximum it is possible to oversample Oversampling is taking more than one measurement during a time interval and returning an average If the signal contains a small amount of noise this technique can increase the effective vertical resolution se of the oscilloscope by the amount given by the equation below Increase in resolution bits log oversample log 4 Applicability Available in block mode 131 only Scaling The PicoScope 3425 PC Oscilloscope has a resolutio
53. sPerAggregate the number of samples that the driver should combine to form each aggregated s i value pair The pair consists of the maximum and minimum values of all the samples that were aggregated For channel A the minimum value is stored in the buffer pointed to by pbuffer_a_min and the maximum value in the buffer pointed to by pbuffer_a_max the number of values written to each buffer or 0 if a parameter was out of range Copyright 2007 Pico Technology Limited All rights reserved ps3425 en 46 PicoScope 3425 PC Oscilloscope 3 2 8 25 ps3000_get_streaming_values_no_aggregation unsigned long ps3000_get_streaming_values_no_aggregation short handle double start_time short pbuffer_a short pbuffer_b short pbuffer_c short pbuffer_d short overflow unsigned long triggerAt short trigger unsigned long no_of_values This function retrieves raw streaming data from the driver s data store after fast Streaming we has stopped Before calling the function capture some data using fast streaming stop streaming using ps3000_stop 3 and then allocate sufficient buffer space to receive the requested data The function will store the data in your buffer with values in the range PS3000_MIN_VALUE to PS3000_MAX_VALUE The special value PS3000_LOST_DATA is stored in the buffer when data could not be collected because of a buffer overrun See Scaling wei for more details of d
54. scilloscope 3 2 8 11 1 TRIGGER_CONDITIONS structure A structure of this type is passed to ps3000SetAdvTriggerChannelConditions 27 in the conditions argument to specify the trigger conditions and is defined as follows typedef struct tTriggerConditions TRIGGER_STATE channelA TRIGGER_STATE channelB TRIGGER_STATE channelC TRIGGER_STATE channelD R R R r e s IGGER_STATE external IGGER_STATE pulseWidthQualifier IGGER_CONDITIONS pi Applicability All modes channelA channelB channelC channelD pulseWidthQualifier the type of condition that should be applied to each channel Use these constants CONDITION_DONT_CARE 0 CONDITION_TRUE 1 CONDITION_FALSE 2 external not used Remarks The channels that are set to CONDITION_TRUE or CONDITION_FALSE must all meet their conditions simultaneously to produce a trigger Channels set to CONDITION_DONT_CARE are ignored The oscilloscope can only use a single channel for the trigger source Therefore you must define CONDITION_TRUE Or CONDITION_FALSE and the pulse width qualifier if required for only one channel at a time ps3425 en Copyright 2007 Pico Technology Limited All rights reserved Programmer s reference 31 3 2 8 12 ps3000SetAdvTriggerChannelDirections short ps3000S
55. signal down one of the channels On some units the signal generator can generate a simple TTL square wave while on others it can generate a sine square or triangle wave that can be swept back and forth Consult the specifications 9 for further details Note The signal generator output is physically the same as the external trigger input so these two functions cannot be used at the same time It is possible however to use the output from the signal generator as a trigger Spectrum analyser An instrument that measures the energy content of a signal in each of a large number of frequency bands It displays the result as a graph of energy on the vertical axis against frequency on the horizontal axis The PicoScope software includes a spectrum analyser Streaming mode A sampling mode in which the oscilloscope samples data and returns it to the computer in an unbroken stream This mode of operation is effective when the input signal being sampled contains only low frequencies Timebase The timebase controls the time interval across the scope display There are ten divisions across the screen and the timebase is specified in units of time per division so the total time interval is ten times the timebase Copyright 2007 Pico Technology Limited All rights reserved ps3425 en 58 PicoScope 3425 PC Oscilloscope USB 1 1 USB Universal Serial Bus is a standard port that enables you to connect external devices to PCs
56. specifies where to look for a trigger Use PS3000_CHANNEL_A 0 PS3000_CHANNEL_1 PS3000_CHANNEL_C 2 PS3000_CHANNEL_ PS3000_NONE 5 threshold the threshold for the trigger event This is scaled in 16 bit ADC counts at the currently selected range If an external trigger is enabled the range is fixed at 20 V direction use PS3000_RISING 0 or PS3000_FALLI 1y delay specifies the delay as a percentage of the requested number of data points between the trigger event and the start of the block It should be in the range 100 to 100 Thus 0 means that the trigger event is at the first data value in the block and 50 means that it is in the middle of the block If you wish to specify the delay as an integer use ps3000_set_trigger se instead auto_trigger_ms the delay in milliseconds after which the oscilloscope will collect samples if no trigger event occurs If this is set to zero the oscilloscope will wait for a trigger indefinitely 0 if one of the parameters is out of range 1 if successful ps3425 en Copyright 2007 Pico Technology Limited All rights reserved Programmer s reference 27 3 2 8 10 ps3000SetAdvTriggerChannelProperties short ps3000SetAdvTriggerChannelProperties short handle TRIGGER CHANNEL PROPERTIES channelProperties short nChannelProperties long autoTriggerMilliseconds This function is used to enable or disable triggering and set its pa
57. streaming mode this is the maximum number of values to return The actual number of data values per channel returned which may be less than no_of_values if streaming FALSE if one of the parameters is out of range Copyright 2007 Pico Technology Limited All rights reserved ps3425 en 40 PicoScope 3425 PC Oscilloscope 3 2 8 20 ps3000_get_times_and_values long ps3000_get_times_and_values short ong Rori Hoti noti HOr Roci hori ong ER St FESE PE FA 1 S S S S S s 1 F F HF handle times buffer_a buffer_b buffer_c buffer_d overflow time_units no_of_values This function is used to get values and times in block mode 13 after calling ps3000_run_block 35 Block model only It will not return any valid times if the oscilloscope is in streaming mode 141 handle the handle of the required device times a pointer to the buffer for the times in time_units Each time is the interval between the trigger event and the corresponding sample Times before the trigger event are negative and times after the trigger event are positive buffer_a buffer_b buffer_c buffer_d pointers to the buffers that receive data from the specified channels A B C or D A pointer is unused if the oscilloscope is not collecting data from that channel If a pointer is NULL nothing will be written to it overflow a bit pattern indicating whether an overfl
58. ter the trigger event Applicability All modes handle the handle of the required device delay specifies the delay as a percentage of the requested number of data points between the trigger event and the start of the block It should be in the range 100 to 100 For example 0 means that the trigger event is at the first data value in the block and 50 means that it is in the middle of the block 0 if unsuccessful or if one or more of the arguments are out of range 1 if successful ps3425 en Copyright 2007 Pico Technology Limited All rights reserved Programmer s reference 35 3 2 8 15 pe 000 run bock short ps3000_run_block short handle long no_of_samples short timebase short oversample long time_indisposed_ms This function tells the oscilloscope to start collecting data in block mode Applicability Block mode 131 only handle the handle of the required device no_of_samples the number of samples to return timebase a code between 0 and the maximum timebase available consult the driver header file Timebase 0 gives the maximum sample rate available timebase 1 selects a sample rate half as fast timebase 2 is half as fast again and so on For the maximum sample rate see the specifications 9 Note that the number of channels enabled may affect the availability of the fastest timebases oversample the oversampling factor a number between 1 and 256 S
59. treaming modes 14 At all but the highest sampling rates these modes allow accurately timed data to be transferred back to the PC without gaps The computer instructs the oscilloscope to start collecting data The oscilloscope then transfers data back to the PC without storing it in its own memory so the size of the data set is limited only by the size of the PC s memory Sampling intervals from less than one microsecond to 60 seconds are possible Block mode In block mode the computer prompts a PicoScope 3425 PC Oscilloscope to collect a block of data into its internal memory When the oscilloscope has collected the whole block it will signal that it is ready and then transfer the whole block to the computer s memory through the USB port The maximum number of values depends upon the size of the oscilloscope s memory A PicoScope 3425 can sample at a number of different rates These rates correspond to the maximum sampling rate divided by 1 2 4 8 and so on There is a separate memory buffer for each channel When a channel is unused its memory can be borrowed by the enabled channels This feature is handled transparently by the driver The driver normally performs a number of setup operations before collecting each block of data This can take up to 50 milliseconds If it is necessary to collect data with the minimum time interval between blocks avoid calling setup functions between calls to ps3000_run_block 351 ps3000_ready 371
60. treaming_last_values 421 to copy the data to your application s buffer Applicability Fast streaming we mode only handle the handle of the required device sample_interval the time interval intime_units between data points time_units the units in which sample_interval is measured max_samples the maximum number of samples that the driver should store from each channel Your computer must have enough physical memory for this many samples multiplied by the number of channels in use multiplied by the number of bytes per sample auto_stop a Boolean to indicate whether streaming should stop automatically when max_samples is reached Set to any non zero value for TRUE noOfSamplesPerAggregate the number of incoming samples that the driver will merge together or aggregate see aggregation adi to create each value pair passed to the application The value must be between 1 and max_samples overview_buffer_size the size of the overview buffers temporary buffers used by the driver to store data before passing it to your application You can check for overview buffer overruns using the ps3000_overview_buffer_status ag function and adjust the overview buffer size if necessary We recommend using an initial value of 15 000 samples 1 if streaming has been enabled correctly 0 if a problem occurred or a value was out of range Copyright 2007 Pico Technology Limited All rights reserved ps3425 en
61. uired to correct the interference at his or her own expense For safety and maintenance information see the safety warning 25 1 6 CE notice The PicoScope 3425 PC Oscilloscope meets the intent of the EMC directive 89 336 EEC and is designed to the EN61326 1 1997 Class B Emissions and Immunity standard The oscilloscope also meets the intent of the Low Voltage Directive and is designed to the BS EN 61010 1 2001 IEC 61010 1 2001 safety requirements for electrical equipment for measurement control and laboratory use standard Copyright 2007 Pico Technology Limited All rights reserved ps3425 en PicoScope 3425 PC Oscilloscope 1 7 Legal information The material contained in this release is licensed not sold Pico Technology Limited grants a licence to the person who installs this software subject to the conditions listed below Access The licensee agrees to allow access to this software only to persons who have been informed of these conditions and agree to abide by them Usage The software in this release is for use only with Pico products or with data collected using Pico products Copyright Pico Technology Limited claims the copyright of and retains the rights to all material software documents etc contained in this release You may copy and distribute the entire release in its original state but must not copy individual items within the release other than for backup purposes Liab
62. unctions you can develop your own programs to collect and analyse data from the oscilloscope 1 2 Minimum PC requirements For the PicoScope 3425 PC Oscilloscope to operate correctly you must connect it to a computer with the minimum requirements to run Windows or the following whichever is the higher specification Processor Pentium class processor or equivalent minimum Memory 256 MB minimum Disk space 10 MB minimum Operating system Microsoft Windows XP SP2 or Vista Ports USB 1 1 s compliant port minimum USB 3 0 sg compliant port recommended Must be connected directly to the port ora powered USB hub Will not work on a passive hub Copyright 2007 Pico Technology Limited All rights reserved ps3425 en PicoScope 3425 PC Oscilloscope 1 3 Safety information We strongly recommend that you read the general safety information below before using your oscilloscope for the first time If you use the oscilloscope in a manner contrary to these instructions safety protection built in to the equipment may cease to function This could cause damage to your computer or other equipment or lead to injury to yourself and others Maximum input range The PicoScope 3425 PC Oscilloscope is designed to measure voltages in the range stated in the Specifications 91 table The oscilloscope can withstand the Overvoltage stated in the Specifications 9 table and operation with voltages exceeding this range
63. urrent clamps have an internal metal case that readily picks up electromagnetic noise from the environment and if the case were not grounded this noise would interfere with the signal TA039 Screened twisted pair cable Use this cable to connect a signal directly to the oscilloscope A positive signal will be displayed when you connect the red BNC plug to the more positive signal and the black BNC plug to the more negative signal If you connect these the wrong way round the oscilloscope will not be damaged but the signal will appear inverted on the scope display Insert the grounding plug into one of the ground sockets on the front of the oscilloscope This grounds the screen of the cable to prevent it from picking up electromagnetic noise that might otherwise interfere with the signal ps3425 en Copyright 2007 Pico Technology Limited All rights reserved 2 5 Product information Specifications Specification Vertical resolution Sg Analogue bandwidth 5 Maximum sampling rate 5A Single channel Two channels Three or four channels Capture memory 56 One channel enabled Two channels enabled Three or four channels enabled Input type Input impedance Input capacitance Common mode voltage range 5 4 to ensure measurement accuracy Maximum safe voltages Differential 574 Any input above scope GND 585 12 bits 5 MHz 3 MHz on 100 mV range 20 MS s 10 MS s 5 MS s 5
64. vds evowecadevsitunsieecebsecaubvelysbnaidsaUevatnecueeveedeuce eiys Suse iE 12 VED EE 12 2 Programming with the PicoScope 3000 Series 1 Voltage ranges ENEE 2 AC DC eegene rinken a NA A NENA ARA 12 KT 12 A Sampling teesse eege 13 De TE 16 6 Sealing ie 16 7 Combining oscilloscopes ENEE 16 8 Functions 3 Programming examples D e 9S E 52 amp Vistial EE 52 Elle TI 53 B Excell Ze 53 6 Agilent VEE ear 53 T ab View Geg ee adc ede we ie 53 4 Troubleshooting eranan eege geegent 54 1 Software error COES siesscscscscdatsecisccieescetccsccccccccsseecseesccdadavescescesccateedspaseccccessseseveccouscbesevcetsveneess 54 2 Driver error codes EE 55 SALELE i E E EEE EEEE E E E EEEE EE EE 56 Copyright 2007 Pico Technology Limited All rights reserved ps3425 en H PicoScope 3425 PC Oscilloscope ps3425 en Copyright 2007 Pico Technology Limited All rights reserved Introduction 1 1 Introduction 1 1 Overview The PicoScope 3425 PC Oscilloscope 57 is a high precision differential oscilloscope What is a differential oscilloscope 101 It is fully USB 2 0 s8 capable and backwards compatible with USB 1 1 s81 There is no need for an external power supply as power is supplied from the USB port making these oscilloscopes highly portable With the PicoScope s software the PicoScope 3425 can be used as a PC Oscilloscope ei and spectrum analvser si Alternatively using the API f

PicoScope 3425 PC Oscilloscope

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