DPScope SE Assembly Guide V1 03
Contents
1. AS hes S i 1Q XH llNY EEN DO8 L Vid 1d92 828 Ce gem ia E vOS IOS 0INY 84 OuS 8ld 1079 98 I5 Vg SL 2 a 2 AS NOd 2ld NZLO LNV COS S TES FLA S XL 7HN ZL ND 19 1950 S V8 ZANV 338ND EN ZI9 tel p e a z m m 100X12 79SO ENV M 438A LIN INZI2 SNV 138 Fg e o vs T SSA YTON E vu 438A 01NI 4NIZIO NY 0OH ke rm ai Ven X 2 naase 29d Q 1Y8 34D ase genee Q9d A n t x NS gt ton N aNd v Q em Se AS SKI 3o T F x AG Step 5 Step 6 Starting the Assembly As a general rule wed start out with the lowest components and work our way up to the higher bigger ones The most sensitive parts will get installed last Again make sure to correctly identify each component before placing it onto the board and verify it is in the correct position before soldering it down Wed start out with the bare printed circuit board All components mount on the top side Note that each component position is labeled with the respective component name called reference designator or RefDes for easy identification A fhelping hand i shown on the right holding the board is very convenient when placing the components because the component leads legs can freely stick out on the bottom 10 Step 7 Resistors Place all the resistors bend their legs at the proper distance and stick the legs through the vias holes on the PCB Bend the component leads apart on the bottom this2. R12 and R13 will move the respective trace red CH1 and blue CH2 up and down A Adjust the trimmers so the red trace is exactly at the height of the red arrow on the left and the blue trace is exactly at the height of the blue arrow The red arrow may hide behind the blue one 26 Step 22 Offset Adjustment Part 2 First we perform coarse offset adjustment in the 2V div range Before offset adjustment vertical CH1 12 Vidiv fox DPScope SE File Utilities Help CH2 2 V div PT hn 1 1 A ALE Llelel el el db kb ke Lelelel d sl db bb kl el v Horizontal Wer 10 5 medi EN mar dr CH 20 k5a sec LHe p Cursors dY Y Vw v 2 After offset adjustment F cope SE hal Iilities Help rN eee l I Horizontal Wer 0 5 ms div CH 20 kS5a sec LH p H Cursors dY Y Vw v Step 23 Offset Adjustment Part 3 Next we perform the fine offset adjustment AChange the voltage scale on both channels to 50 mV div Change averaging to 10 to reduce visible noise makes adjustment easier Before offset adjustment Vertical After offset adjustment CH1 50 m die e Ex DPScope SE Scope File Utilities Help CH2 jB mM div Utilities Help Horizontal Ve Horizontal We 10 5 ms div ES 0 5 ms id aT 20 k5a sec 20 kS asec 4 DIAS D li cH Cursors dv Y v V Cursors dv Y V V 28 All
3. its power from the USB bus it needs only about 70mA The actual USB supply voltage can vary between 4 3V and 5V You can measure the USB supply voltage directly by selecting Utilities gt Check USB Supply in the DPScope SE software Typically the supply voltage is on the lower end when other devices draw a lot of current from the bus Also many laptops tend to have pretty noisy supplies which will show up as noise on the scope signals Thus it can be preferable to attach the DPScope SE to a self powered USB hub instead in order to have a cleaner supply voltage closer to 5V Note 2 he DPScope SE software needs a screen resolution of at least 800 x 600 pixels Also note that increasing the Windows font size through the Display control in the Setup panel can mess up the screen layout because some labels etc will no longer fit into their allotted space 24 Step 20 Software Start Launch the DPScope SE software It should look like the picture below This means the scope communicates successfully with the PC If you get a message saying that no instrument has been detected unplug the USB cable wait a few seconds and plug it in again Normally this should not happen though Press the fRunobutton the button label changes to retopoand the two scope traces should come alive Sometimes when there is very little noise on the signals it can be hard to see whether the traces get updated or not Choose some higher average setting an
4. the same page you can also find the User Manual To attach the scope to your PC you will also need a standard size USB cable as this is not included in the kit The cable needs a USB A connector on one end USB B on the other These are the fgarden varietyo mormal sized USB connectors i e not the miniature ones one is the filat rectangularotype and the other the rsquarishoone see picture below No special USB driver is needed The instrument runs as a HID human interface device class peripheral and Windows 2000 and higher include generic HID drivers right out of the box Install the DPScope SE software Simply unpack the installation files click on Setup exe and follow the instructions The installation program will create an entry in the Start menu T 23 Step 19 Startup Attach the DPScope SE to a free USB port on your computer The oscilloscopeG frontpanel LED should blink a few times and then stay on The blinking should last for about one second total lf that amp the case then your oscilloscope has just passed the first functional test The LED will only come on if the microcontroller actually starts successfully If the blinking speed is much slower this would indicate a problem with the 12 MHz resonator or its connection to the microcontroller Walt for a minute or two to give the computer time to recognize the new instrument you should get a status message when that happens Note 1 The oscilloscope gets
5. to overheating so be careful to solder them quickly The best approach is to first solder only one end of all diodes then the other end this gives them enough time to cool down in the time between Note Be careful the diodes have to be put in with correct polarity orientation the negative end is denoted by a black band around the diode body The silkscreen outline also shows a white stripe when properly installed the black diode band should match the white silkscreen stripe Note that the orientation is not the same for all diodes see picture below Installing the diodes the wrong way around will prevent the instrument from working and may even damage the diodes The inductor on the other hand is not polarized and can be put in either way Black stripe aL DPScope SE V1 1 Aug 2011 Ka www eyesore com KEE Tir ERE ee A E n GER f nan O C c VT gt E C k d 4 ewm A e SH SS OND long pin ooo Meee Hee Be ge O00000 CAE HID H T Dm 13 Step 10 Ceramic Capacitors Now on to the ceramic capacitors same mode of operation as before These components can look very similar to each other and their color may vary and be different from what you see in these pictures You really need to identify them through the markings printed on their housing there are usually additional markings letters and maybe numbers denoting package type tolerance and so on but only the
6. will hold the resistors securely when you turn over the board to solder them on This is what the top of the board should look like E SH 2 5 fez c od 6666 LD D ooooo DOooococo oo0600 Tt i za H Qr as m ION oe ca E HRS oH Cut See ell a ciu Co t se a SER e B5s355 And here is the bottom view you can clearly see how the leads are bent apart to hold the resistors c O oon oo gt E 11 Step 8 Resistors To solder touch the component lead wire with the soldering iron and the solder wire at the same time Add enough solder so it completely fills the hole and leaves a small milloof solder Remove the solder wire and the soldering iron but dond move the board before the solder has become completely solid again The solder joint should be shiny and bright if you are using lead solder the new RoHS compliant solder will look dull Repeat for the other leads This is how the bottom of the board will look like when you are done GD eheheneheneneohenen C Qo 100007 Gooo0o0oco0oces le Q eje y ei GD cke Now clip off the protruding wire ends with the wire cutter Take your time I this is a good opportunity to check that you did not accidentally forget to solder some of the connections ebe Re Re Re Ne Re Qoopooo 12 Step 9 Inductor Diodes Next are the inductor and the clamping diodes Works the same as the resistors The diodes are quite sensitive
7. DPScope SE Assembly Guide Version 1 02 Feb 2 2012 Congratulations on purchasing the DPScope SE oscilloscope kit This guide will lead you through all the steps required to put it together so youd be measuring signals in no time While we made every effort to create a kit that is robust and simple to assemble there are some components that are sensitive to mishandling e g putting them in with wrong polarity so please pay close attention to the description for every step Moderate soldering experience is required You will need a few tools for the assembly omall soldering iron about 17 Watts power with sufficiently fine tip omall gauge rosin core solder Flat nosed pliers to bend component leads omall wire cutter to cut off component leads 15 mm wrench or small adjustable wrench to fasten the BNC connectors to the front panel omall Philips screwdriver to adjust the trimmer resistors and for the enclosure Mid sized Philips screwdriver for the enclosure screws An ohmmeter is very helpful to identify the different resistors ye o pe gt ye Do ye Do All components are mounted on the top side of the board All soldering is done on the bottom side of the board The time required for putting the scope together will depend on your experience a seasoned hobbyist should be able to do it in around one hour but if you are new to this it will take longer If you have any questions or feedback do not hesitate to cont
8. Done Congratulations you have successfully assembled set up and tested your new oscilloscope Now put the bottom cover on the instrument and screw it shut with the four Philips screws If you still have questions Email support 2dpscope com Webpage http www dpscope com User Forum http doscope freeforums org USB www DPScopeieor DPScope S B P E 29
9. act us Email support dpscope com Webpage http www dpscope com Step 1 Unpacking the Kit Below you see the kit as it comes out of the box Turn it upside down unscrew the four screws on the bottom of the enclosure and carefully lift the bottom make sure not to drop any components To attach the scope to your PC you will also need to supply a standard size USB cable USB A connector on one end USB B on the other not supplied with the kit Step 2 Identifying Resistors Resistor values are color coded see table below The resistors used in the kit with 596 tolerance have 4 colored bands two significant digits one multiplier one tolerance E g brown 1 1 red 2 yellow 10E4 1 gold 5 means 12 1E4 q 120 kq Tolerance 5 Hesistors used in the kit with 196 tolerance have 5 colored bands 3 significant digits one multiplier one tolerance If available checking each resistor value with an Ohmmeter is recommended Zb tgo 460kf tiw Multiplier Tolerance 1st Digit 2nd Digit Step 3 Identifying Capacitors A Ceramic capacitors The value is given in pF as one 3 digit number fxxy comprising 2 significant digits xx and one multiplier y The markings may be small so to read them use a magnifying glass if necessary Sometimes there is only a single digit or two digits this then gives the capacitance in pF directly Letters e g J K denote tolerances etc for our purpo
10. as installed incorrectly A The integrated circuits the diodes and the LED light emitting diode are very sensitive to electrostatic discharge it is good practice to use a grounded wrist strap to avoid damage to them during assembly and to place all the components on an antistatic surface Unpainted wood is a good choice Don wear clothes that get easily charged up e g wool sweater In most cases such discharges are too weak for you to notice but they can still damage or destroy the tiny components in an instant Step 4 Components Printed circuit board custom end panels BNC connectors washers nuts USB connector Trimmer resistors LED Backpanel 8 pin connector Hesistors Electrolytic capacitors Ceramic capacitors PIC18F14K50 microcontroller MCP6024 op amp DIP sockets Ceramic resonator Inductor choke Diodes RCA cinch audio connectors 6 optional not included Step 4 Component List Qty Refdes Value Tol Description R3 Rg 100 kOhm 1 Resistor R5 R15 R20 R21 R22 R23 10 kOhm 5 Resistor R4 Ro R9 R10 kOhm 1 Resistor R14 R15 R18 220 Ohm 5 Resistor R17 R19 2f Ohm 5 Resistor HI R11 1 53 kt 1 Resistor 1 R2 Weess R12 R13 r resistor ceramic LED red alternatively use RCA Cinch connectors also space for 2 pin 0 1 ju
11. c Capacitors Trimmer Resistors Resonator The electrolytic capacitors are next Watch out they may look similar but have different values 4 7uF and 100uF i clearly printed on their housings Note Be careful these capacitors have to be put in with correct polarity The negative side is clearly labeled with a white stripe and RO minus symbols make sure you install them as shown in the pictures below Installing the wrong way around will damage them immediately once the circuit is powered up they may even explode Next are the trimmer resistors note that two of the holes will remain unused the footprint can accommodate different common pinouts Finally install the 3 pin ceramic resonator its orientation is not important Neg terminal AB M i Eei V oPScope SE SAAR ug Mm Mui A NW Ww dpo EE X cM ee HRS CONTE EWH ar CL Ko e d c GND xl pin STA an TT kb LL W356 VON eL a d JSP Step 13 USB Connector Logic Analyzer Header The USB connector is easy to install Make sure though that it sits flat and straight like sockets and any multi pin component it is very difficult to correct errors once all the pins are soldered down Thus install the connector and solder one of the big pins tabs on the side Check for proper alignment correct if necessary by re heating the solder joint and readjusting the connector Then solder all the other pins Similar for the 8 pin header 1 solder o
12. capacitance is important for us Marking 474 0 47 uF 104 0 1 uF 181 180 pF 470 or 47 47 pF 220 or 22 gt 22 pF asn f ook 04 QE AHI M I LLL E 72 fe wos edoasdp MMM du ez nyy LA i m E 5 E NE 14 Step 11 Chip Sockets Now come the sockets Be careful with their installation because once soldered down a socket is almost impossible to remove The best way is to do it step by step 1 Place the socket on the board as shown in the big picture Note the position of the notch on the left side of the silkscreen outline make sure to orient the notch on the socket to the same side This will make installing the chips less error prone 2 Turn the board over and solder only two of the corner pins as shown in the zoomed in picture below The reason is simple 1 two pins diagonally opposed will securely hold the socket in place but still allow you to make corrections 3 Press the socket onto the board and re heat both of these solder joints this allows the socket to sit flush against the board Visually inspect the socket to make sure this is really the case 4 Only now solder all the other pins RU ad Fi i C amp U ppscope SE V1 1 Aug 2011 TY oum http 7 www dpscope com e Oe 1b ho ER HHB AER H HW O E x gt LA E AIR CR STILA Sees is D 000000000000d Qa D 5 Ce At first solder only plat M E two corner pins 15 Step 12 Electrolyti
13. d see if the number of acquisiton counts up all the way to this setting feet DPScope SE File Utilities Help Display CH ee P REF v Lines m cH EE E REF T bold si Dots Persist Levels Cursors Ce C FFT Setup PositionfLevel Acquisition CH1 CH2 Trig m m E EIE ES at e continuous single shot No Avg Horizontal Vertical Triqger j 0 5 ms div cuit avn Source Ce Auto CA 20 kSa sec s les DE Polarity 9 e Cursors dv Y V v dt ms 1 dt kHz 25 Step 21 Offset Adjustment Part 1 A Make sure the settings are the same as on the page before File Utilitie Horizontal 0 5 ms div PositionfLevel Vertical 2V div for both CH1 and CH2 CHI CH2 Tig Trigger Auto Ja E Acquisition continuous No Avg Display CH1 and CH2 on Lines FFT off A In the f Acquisition menu change the l averaging to fAvg 100if you want to LL LI A In the fPosition Levels frame move the n sliders CH oand rCH20to the middle simply click on the read and the blue rxobuttons The ground level indicators blue and red arrow on the left in the waveform display will be in the middle as well Horizont A Press fRun to start acquiring waveforms A Connect the probes and short them i e connect signal and ground together With a small screwdriver you can now adjust the offsets of the two channels A Adjusting the two trimmers
14. ecurely in place Turn the board over and solder the LEDG legs onto the board Cut the wire ends Press the LED back so it does not stick out too far at the front 21 Step 17 ICs Back Panel Enclosure Now itG time to install the ICs integrated circuits Make sure to put the chips on in the correct orientation Each chip has a notch on one end I this notch must go on top of the notch in the silkscreen outline and the notch in the socket if you installed those correctly Verify that none of the pins is bent and they all make good contact in the socket Put the back panel on and place the board into the enclosure bottom Snap on the top The end panels should fit snug into the grooves on either end which holds them firmly in place Do not screw the box shut yet we still need to perform offset adjustment Congratulations your oscilloscope is fully assembled i ETE pes ee Lud eo c i aCe 4 a ee us O A A LI amp E M USB T www DPScopeicom 22 Step 18 Software Installation If you haven already done so go to the DPScope website http www dpscope com and download the DPScope SE software make sure you get the software for the DPScope SE not for the relassico DPScope 1 Go to http www dpscope com 2 On the navigation bar on the left of the webpage choose rDPScope SEQ 3 Click on rDownloadoon the top navigation bar 4 Look for the PC software link and click on it On
15. mper headers J SlG1a J SlG2a Youd also need a USB cable not included in the kit but most people have already a few lying around anyway If you need to buy one e g Digikey part AE1462 ND works fine 7 Component Placement Step 4 ee D ast 6 on o ei ono s Eeer ee E gioco Die oo n ss o DU OOOOOOOl O afla jo Ssoeseso u n 9 Eo dsl f OO OO OO OO OD O o e o n amp o n a o OO OO OD op cD 8o meen Clees 000000 CD o000000000 o UN ko OND ade E AS 4 o ss n O czy o O z o O zz o O ozy oO 69 CD 9 os o s n Woo sdoosdp mmm d31u uer ny VIA 35 adoosgg Bi uid Buoy o alo oo ol asjo usog o ofa o oo n s o okla n es jo n s o amo GO D Q M ALSALS s ON Q S T R if i ec vind oe ae de x v FS H S 2 lt x OND 99 Z09d2WM R E o QNO d so 2 Is is 2 La AG a xt o o AST 7 2 S o 2 EI ZS l E a LS HI g h a N S52 Be a m Ze ha DG S Oe Se eom E QN9 I gt b engt Se W AS 4 amp i N ONE x QN9 an9 r x I eg 6 aad DE T HB E XV Sv RB E ozois r SC vou QN b S N Fa E e9is f 0 N R E S o n lt N p QN9 N LA Spaz a T do um diQd Sv 48LOld So x nN o gen T HE NEN qu 2 o g E 2 c ha he iz mM O 1 288 O9SOLL 0QS 6NY 28 S x 1957 957986 19500 1 DI9 11 SS 8NV 928 V
16. ne pin check alignment then do the rest of the pins Below is also a side view to show the proper vertical position of the connector the bottom of its plastic piece just flush with the top of the printed circuit board TN C HE ETE E TE TS Lg ES ER IL d E U gres 1 a H 7 Ps i ew 111 i R13 z n gt Tunn gt em L a G ME TT EIU eT iier ur EN v v JSF C1 EECHER 17 Step 14a Front Connectors RCA If you are assembling the bare board version of the scope i e without enclosure then you can install RCA cinch audio connectors instead of the standard BNC connectors note only BNC connectors are included with the kit Some people prefer RCA connectors because it is a bit easier to build cheap probes for them The connectors fit into the same location as the BNC connectors Similarly there is also space for 0 16jumper headers which can be convenient if you want to hook up the instrument to some breadboard circuit Both options are shown below Note that the BNC connectors are mandatory if you want to mount the board in the Serpac enclosure 18 Step 14b Front Connectors BNC The standard connectors coming with the DPScope SE are BNC connectors These are the same connectors you find on commercial oscilloscopes and they allow you to connect standard scope probes or standard BNC cables Install the connectors and verify they fit through the custom f
17. ront panel you may even attach the front panel to assure the connectors keep the correct distance Like the sockets and any multi pin component it is very difficult to correct errors once all the pins are soldered down Thus solder only one of the big tabs first Check for proper alignment i e make sure that the connectors sit flat and straight on the board see pictures If necessary re heat the solder joint and readjust the connector then check again Only when everything is correct solder down all the other pins The big pins will need a lot of solder to fully fill up the mounting holes don be shy because that will be the only thing holding the board in tpe when it is sitting in the enclosure VET P oPscope SE V11 hus Bs NEN ALLE GEES Com P mm wa 7 Step 15 Indicator LED Take the LED light emitting diode and bend its legs by 90 degrees as shown in the picture Fit it into the board Make sure the long leg of the LED goes into the side where the silkscreen indicates long pin Do not solder the LED yet we need to install the front panel first short leg notch long leg Step 16 Front Panel Now put on the front panel 1 the LED must go through the center hole For the BNC connectors add the washers if included the frontpanel and finally the nuts Tighten the nuts with a wrench Be careful not to over tighten them damaging the connectors threads The front panel now holds the LED s
18. ses here simply ignore tem i e rKodoes NOT mean fkilod 474 means 47 10E4 pF 47 10000 pF 470 nF 0 47 uF 104 means 10 10E4 pF 10 10000 pF 100 nF 0 1 UF 181 means 18 10E1 pF 18 10 pF 180 pF 220 means 22 10E0 pF 22 1 pF 22 pF 24 means 24 pF 1 means 1 pF A Electrolytic capacitors Their values are typically printed without any encoding Just be careful not to overlook the decimal point E g 100 uF 4 7 UF since electrolytic capacitors are polarized must be connected to positive and negative side the correct way otherwise they will be destroyed their polarity is indicated as well Aluminum capacitors normally have the negative terminal denoted by a big bar with RoOsigns while tantalum Capacitors have the positive terminal marked This kit uses only normal aluminum capacitors Step 4 Components On the next page you see all the components spread out Everything you need to build the oscilloscope is included Please use the component list on the page after to verify that you have all the parts shown below some general remarks A Some components may look somewhat different than in the pictures T different color different leg length etc Make sure you reliably identify each component before you solder it onto the board Take your time It is much easier and much faster to perform a very careful assembly than it is to troubleshoot a circuit that does not work because some component w
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