User Manual Rev. 01a
Contents
1. capacitor trimmer with a small screw driver so that the waveform displays sharp rightangle photo C un connected 5 Set SEN1 switch to IV and SEN2 switch to X1 while keep all other settings unchanged Adjust C6 so that sharp rightangle waveform is displayed 6 460 Running A Not enough B Too much Hints Runn ing Leave black clip Connect red clip to test signal output 6 46V The LED at bottom right corner labelled TRIGGED is the trigger indicator It blinks when triggers are detected Triggers and Their Modes Triggers are events that indicate signal voltage acrossing a set level i e trigger level along a specified direction i e trigger slope rising or falling Oscilloscope uses triggers as reference points in time for stable waveform display and measurements Auto Mode In auto mode oscilloscope will perform display refresh no matter triggers happen or not When triggers are detected waveform display will be displayed with reference to trigger points Otherwise display waveform at ramdom reference points Normal Mode In normal mode oscilloscope will only perform display refresh when there are triggers If no triggers happen waveform display will stay unchanged Single Mode Single mode is the same as normal mode except that oscilloscope will enter HOLD state after a trigger has been detected and waveform display has been updated Nor2. makes the actual sensitivity which is displayed at the lower left corner of the panel Press on Reset button Perform a system reset and re boots the oscillscope OV Line Alignment Sometimes you may find the OV line the trace corresponding to 0V input voltage does not match with the VPOS indicator at the screen left border This can easily be fixed by performing the OV line alignment function First set the couple switch CPL to GND position Then press on SEL button to make VPOS indicator highlighed and hold down OK button for about 2 seconds You will set the trace aligned to VPOS indicator when you release OK button You may see some residue mismatch remains at the highest sensitivity settings This is normal Probe Calibration Because there is always some capacitance between scope input and ground probe needs to be calibrated to achieve better measurement results for high frequency signals This can be done with the help of the built in test signal To do this please follow the steps below 1 Connect the red clip to the test signal terminal and leave the black clip un connected see photo at right 2 Set SEN1 switch to 0 1V and SEN2 switch to X5 Set CPL switch to AC or DC 3 Adjust timebase to 0 2ms You should see waveform similar to that shown in photos below If traces are not stable adjust trigger level the pink triangle on right screen border so as you get a stable display 4 Turn C4
3. position Place the negative pen of volt meter here to do voltage measurements Page 2 How to Use Display and Controls Horizontal Oscilloscope Position Trigger Level Connectors Mode Readout WA for Power Supply Connector for Probe OK HOLD RUN Selection CPL Couple P ya Selection Jor arameter lt Adjustment SEN1 ere Sensitivity Selection 1 eman election SEN2 Sensitivity Selection 2 Trigger Level Indicator bios Reset Maa Sensitivity Couple Timebase Trigger Trigger Trigged Button Roa V div sidiv Mode Slope Indicator Indicator e Connections Attention 1 Power supply voltage must not exceed Power Supply Connect DC power supply to J9 or J10 The power 12V Otherwise U5 will get hot supply voltage must be in the range of 8 12V 2 Allowed maximum signal input voltage Probe Connect probe to J1 is SOV pk 100Vpp with the clip probe Operations Press on SEL button Select parameter to be adjusted The selected parameter will be highlighted Press on or button Adjust the parameter selected by SEL button Press on OK button Freeze waveform refresh entering HOLD state Press on it again will de freeze Change CPL switch Set couple to DC AC or GND When GND is selected the scope input is isolated from input signal and connected to ground OV input Change SEN1 or SEN2 switch Adjust sensitivity The product of SEN1 and SEN2 settings
4. B6 DBTO i B DBTI 3g DB DB12 DB13 GND DB7 DBTA a m DB15 5 4 T T DBT6 m E DB17 nRESET si VCC2 VCC3 Z GND2 DB5 DB6 DB7 y L O e O L HEADER 20X2 JP1 GND1 1 1 JP2 GND2 Y itle 2 4 TFT BASE ize Document Number Rev A 105 13700 00A 00A Date Saturday August 23 2014 heet 1 of 1 Page 5 a a Be Be R26 ARTE 7 A TP26 po LA me le Sri l 8 ws e ci ere ie 8 re me G E ee gi go00 ou 9 ee eL eee e U d C2 jik a se ee cat es A N ss ecl 2 e e 3000Mils d LA 7 6cm 55 se e et T0 8 ee FAN ki n enie e eo NE aroa ce e set a se SILTS fu Z e e ja me e KHH TD GERI e N ee ers ete 7 ma pe R35 RZB se og W e e TPA TPS TP4 TPS TRSA TES eae B B B y Page 6 DSO138 SMD Part List Pre soldered C Resisor 10K 00 6 RI R20 RAS RAAL RIS RAT Pressoldered C Reiso LSROBOS H RIO RA RASO FLI Pre soldered STM32F103C8 QFP 48 TLO84 SO14 pt ju Pressoldered LM1117 3 3 TO263 U3 Pre soldered Page 7
5. E C16 C17 i 1 X2 pin C18 C20 e ae C23 LI 33 2X20 pin c7 cs 120pF c12 C13 22pF LISWI SW2 2P3T IN5819 IN4004 or 1N4007 13 Power inductor Solder positive pole SE NEN 1mH 0 5A the longer lead to the square pad Page 1 20 Test signal ring 1 Make a small ring with a lead cut off 2 Solder the ring to the two holes of J2 as shown in the photo D Apply 9V power to J10 or J9 QE Check voltage at TP22 It should be around 3 3V E If voltage at TP22 is good disconnect power Short JP4 with solder permanently on the main board Troubleshooting LCD Dark No backlight Is voltage at V good Yes Is R36 value correct Check power suppl Fix R and soldered good Yes Do you get about 3V No Check R36 and power again No Display Short JP4 if it has not been done See Step 2 above Press SW8 Does LED blink gt Check J3 soldering for possible opens or shorts gt Check JI soldering on LCD board for possible opens or shorts between J1 pin 16 18 on LCD board Yes Check LCD board Short JP3 with solder Plug LCD board into the female headers J3 J7 and J8 NOTE The voltages in the photo are for reference only K Check 3 3V voltage gt Check Y1 C12 C13 gt Check LED installation AV correct Yes Yes Check R12 and C8 Are the values of AV and Set CPL switch to GND an
6. Soldering Hints 1 Put leads through mounting holes from the side with part outline Ensue component evenly touch PCB 2 Solder leads at the other side Solder should fully fill and cover soldering pads Avoid bridges between neighbering pads Cut unused leads flush with cutter User Manual xa Before you start DSO 138 Oscilloscope DIY Kit BEB 14 Electrolytic capacitors O sew ki Tools vou need D Iron 20W 4 Screw driver 2 Solder wire 5 Flush cutter G Multimeter 6 Tweezers D Check part values amp quantities against part list 2 Always meter resistor values before soldering Solder positive pole LI c19 C21 100uF 16V the longer lead to C22 C24 the square pad C25 C26 kaye G Understand all part polarities and orientations These parts are optional and not required Step l As sembly Main Board and LCD board follow the order as numbered for the normal oscilloscope function 9 Pin header for power DCOO5 Face the opening l lak outward ways meter resistor sa USB mini B values before soldering 2 Pin LI R7 R36 1802 LI R1 R14 R16 100K2 D R8 R12 R13 1202 CI R2 L8MO Ro RIS R26 IKQ L R3 200K2 R10 3KQ L R4 Ten JRILR38 1 5K LI SW4 SW5 6X6X5mm l SW6 SW7 LI RS 20K Q Cl R28 R40 4702 wa Ge SW8 CI R6 300Q Cl R37 R39 10K2 LI ci co 0 l1u F C10 C11 C14 C15 Y
7. ZO me SE Li 100uH C24 100uF R4O 470 po C23 R39 O 1u 10K These voltages are power volt age dependent T 9 3V power voltage 100K U 79L05 TO92 TP31 L U1 PAO PD1 OSC OUT PA1 PA2 PA3 PA4 PDO OSC IN PAS PA6 PA7 PA8 PA9 PA10 PA11 PA12 PA13 PA14 PA15 PBO PB1 PB2 PB3 PB4 PB5 PB6 PB7 PB8 PB9 PB10 PB11 PB12 PB13 VDD 1 PB14 VDD 2 PB15 VDD_3 PC13 TEMPER RTC VSS 1 PC14 0SC32 IN VSS 2 PC15 OSC32 OUT VSS 3 STM32F103Cx C15 L4 100uH O 1u 3 3V C26 d UOUE 3 3V C16 C17 C18 O 1u O 1u O 1u 1 Part values used values shown D3 LED R28 470 iq 143 8V LCD nRESET LCD HEADER LCD RS 3 3V LCD_nRD could be different to Please refer to part 2 Parts in dash line boxes are SMD devices Page 4 DBO 5 E DB1 LCD1 DB2 2 B DB3 DBO GNDI VCCI 5B n L L DB2 AWR y a nRD DB MO O O GNDI VU o m XR a VCC YD LED A n D K pa L D K2 3 RS LED K3 S S LED K4 a AWE M3 y a DB4 7 NRD DB10 S gt DBTI IMO DB12 DB13 yi DB14 a E DBT5 YO DB16 DB17 A XR nH E VCC2 YO VCC3 a 2 GND2 gt LEDA DB5 DB6 DKI DB y L c a L D K2 w LC O 5 K3 y e o LED K4 HEADER 20X2 US DB4 DB10 a DBTI gt DB13 DB2 DB3 DBT4 GNDi mi ba VCCI o DB15 nos p RS a DEIC nWA y L nRD a DB17 IMO S a XL nRESET YO XR y 5 YO O L 57 VCC3 LED Ki y a LED K2 4 GND2 D K3 S L D K4 DB5 M3 m E DB4 oa pene me gt D
8. d measure V1 and V2 Are they correct 22 LCD Board Note Install to the side opposite to LCD panel O J1 J2 J3 2 X20pin 1 X2 pin The assembly should look like this after you have finished all parts C Verify Connect power supply again You should see LCD lights up and oscilloscope panel displayed Press various buttons and move switches to verify their functions D Attach probe clips to JI Touch the red clip with your finger Do you see signal from your finger O mi Oi e ka kan ayi Trigger LED blinking twice indicates booting up is good GW GD GAD aa Voltage References o 19V7 6 43 V Ga Input Voltage SainSmart ai Je W Yay 4 Ti K The voltages on vour board could be different But thev should be close to the values shown B a a q can ZO l kk a mesy L mi 4 MOS a WHS jt xa i F 3 8 H E a gara f n A anala L ee EI Fi es e A GNO A x K 536 f o o zo se Wes isle become Oe ji F vul on j g mi E avi o SENN 9 ef a B KU nan enc e E 1 gt le sanse summu gt y Fix them No Check U2B U2C and related parts around these two amplifiers NOTES These voltages are input voltage dependent The values shown were measured when input voltage was 9 39V These voltages are measured when CPL switch SW1 is set to GND
9. mal and single modes are useful for capturing sparse or single waveform Specifications Max realtime sample rate 1MSa s Analog bandwidth 0 200KHz Sensitivity range 10mV div 5V div Max input voltage 50Vpk 1X probe Input impedance 1M ohm 20pF Resolution 12 bits Record length 1024 points Timebase range 500s Div 10us Div Trigger modes Auto Normal and Single Trigger position range 50 Power supply 9V DC 8 12V Current consumption 120mA Dimension 117 x 76x 15mm Weight 70 gram without probe Page 3 C2 220pF RI 100K 10mv C3 3pF 0 1V R2 1 8M 196 lv R3 C4 200K 1 30pF C5 1pF ld R4 2M1 C6 R5 30pF 20K 1 C7 1200F X7 CPLSEL TP6 Power Supply Power supply voltage can not be higher than 12V D2 1N4004 V These voltages wer Ar 7 I TO a k measured ak when SWI is at GND position vi Cov TP2 X1 U2B AV O TLO84 SO L R6 X2 a l 300 X5 4 G R7 180 n AV R8 Mo 120 AVE ON KI on VSENSEL1 TP7 Test Signal Terminal TESTSIG L T R26 1K J2 TP27 TP28 TP29 TP30 8550 an D1 PE 1N5819 L2 1mH 1A eus 1 5K aay SS values shown were measured at SW3A U2C TLO84 SO R11 1 5K U2D TLO84 SO
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