Download User Manual Rev. 01a

Soldering Hints
DSO 138 Oscilloscope DIY Kit
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.
3 Cut unused leads
flush with cutter.
User Manual
4 Screw driver
5 Flush cutter
6 Tweezers
Step 1 Assembly Main Board and LCD board (follow the order as numbered)
1. Resistors
Rev. 01a
Before you start
Tools you need
1 Iron (20W)
2 Solder wire
3 Multimeter
14. Electrolytic capacitors
5. USB Socket *
1 Check part values & quantities against part list
2 Always meter resistor values before soldering
3 Understand all part polarities and orientations
* These parts are optional and not required
for the normal oscilloscope function.
Solder positive pole
(the longer lead) to
the square pad
C19, C21, : 100μF / 1 6 V
C22, C24,
C25, C26
15. Power connector
9. Pin header (for power)
: DC005
J10
Face the opening
outward
Note:
Always meter resistor
values before soldering
J4
: USB mini -B
J9
: 2 Pin
16. Pin-header (male) *
: 180Ω
R7, R36
R1, R14, R16 : 100KΩ
R8, R12, R13 : 120Ω
R2
: 1.8MΩ
R9, R15, R26 : 1KΩ
R3
: 200KΩ
R10
: 3KΩ
R4
: 2MΩ
R11, R38
: 1.5KΩ
R5
: 20KΩ
R28, R40
: 470Ω
R6
: 300Ω
R37, R39
: 10KΩ
10. Transistors
6. Tact Switches
SW4, SW5, : 6 X 6 X 5mm
SW6, SW7,
SW8
Q1
: 8550
Q2
: 9014
J5
: 1 X 3 pin
J6
: 1 X 4 pin
17. Pin-header (female)
2. HF-Chokes
11. Regulators
7. Ceramic Capacitors
: 100μH
L1,L3,L4
3. Diodes
Cathode
D1
: 1N5819
D2
: 1N4004
(or 1N4007)
C1, C9,
C10, C11,
C14, C15,
C16, C17,
C18, C20,
C23
: 0.1μF
C2
: 330pF
C7, C8
: 120pF
C3
: 3pF
C12, C13
: 22pF
C5
: 1pF
U4
: 79L05
U5
: 78L05
12. Capacitor trimmers
C4, C6
8. LED
4. Crystal
: 5 - 30pF
: 8MHz
Solder positive pole
(the longer lead) to
the square pad
D3
:φ3mm, green
L2
: 1 X 2 pin
: 2 X 20 pin
18. Slide switches
SW1, SW2,
SW3
: 2P3T
19. BNC connector
13. Power inductor
Y1
J7, J8
J3
: 1mH/0.5A
J1
: BNC
Page 1
20. Test signal ring
21. JP3
22. LCD Board
1 ) Make a small ring with a
lead cut-off.
Note: Install to the side
opposite to LCD panel.
Short JP3 with solder
2 ) Solder the ring to the two
holes of J2 (as shown in
the photo).
Step 2 Test and Use
A. Check voltages
B. Attach LCD board
Plug LCD board into the female headers J3, J7, and J8
on the main board.
: 2 X 20 pin
J2, J3
: 1 X 2 pin
The assembly should look like this
after you have finished all parts
NOTE: You need a 9V DC power supply (at least 200mA capacity)
to run the scope. This power supply is not included in the kit.
1 Apply 9V power to J10 (or J9).
2 Check voltage at TP22. It should be around +3.3V.
3 If voltage at TP22 is good disconnect power. Short JP4
with solder permanently .
1
J1
C. Verify
A. Use
1 Connect power supply again. You should see LCD
lights up and oscilloscope panel displayed.
2 Press various buttons and move switches to verify
their functions.
1 Attach probe clips to J1.
2 Touch the red clip with your finger. Do you see signal
from your finger?
1
2
2
“Trigger” LED blinking twice
indicates booting-up is good.
3
Troubleshooting
LCD Dark
No Display
(No backlight)
Is voltage at V+
good?
No Check power
Yes
Is R36 value correct
and soldered good?
supply
Fix R36
Yes
Check LCD
board
Short JP4 if it has not been
done. See Step 2 above.
Press SW8. Does LED blink?
Yes
Check J3 soldering for
possible opens or shorts
Check J1 soldering on LCD
board for possible opens
or shorts
-5.0V
4.99V
Voltage
References
5.02V
*
*
-8.08V*
Check +3.3V voltage
Check Y1, C12, C13
Check LED installation
3.3V
0.19V
* 9.39V *(Input Voltage)
6.43V
8.60V
-8.11V
No
No
Do you get about 3V No
Check R36 and
between J1 pin 16 &
power again
18 on LCD board?
Yes
NOTE: The voltages in the photo are for reference only.
The voltages on your board could be different.
But they should be close to the values shown.
*
3.3V
8.34V
*
-1.39V
No Trace
2.16V
No
Are the values of AV+ and
AV- correct?
0.81V
Fix them
Yes
Set CPL switch to GND No Check U2B, U2C and
and measure V1 and V2.
related parts around
Are they correct?
these two amplifiers
0V
**
1.66V
Yes
Check R12 and C8
Place the negative pen of volt-meter
here to do voltage measurements.
**
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 position.
Page 2
How to Use
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.
Display and Controls
Oscilloscope
Mode
Horizontal
Position
Connectors
Trigger Level
Readout
for Power Supply
Connector
for Probe
[OK]:
HOLD / RUN
Selection
[CPL]:
Couple
Selection
[+] or [-]:
Parameter
Adjustment
[SEN1]:
Sensitivity
Selection 1
Leave black clip
un-connected
Connect red clip to
test signal output
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 C6
to that shown in photos below. If traces are not stable adjust
trigger level (the pink triangle on right screen border) so as
C4
you get a stable display.
4. Turn C4 (capacitor trimmer) with a small screw driver so that
the waveform displays sharp rightangle (photo C).
5. Set [SEN1] switch to 1V and [SEN2] switch to X1while keep all other
settings unchanged. Adjust C6 so that sharp rightangle waveform is
displayed.
[SEL]:
Parameter
Selection
[SEN2]:
Sensitivity
Selection 2
Trigger
Level
Indicator
A – Not enough
Vertical
Position
Indicator
Sensitivity Couple Timebase
Trigger
(s/div) Mode
(V/div)
Trigger
Slope
“Trigged”
Indicator
Hints
Connections
Power Supply:
Connect DC power supply to J9 or J10. The power
supply voltage must be in the range of 8 - 12V.
Probe:
Connect probe to J1.
Atte ntion
1. Power supply voltage must not exceed
12V. Otherwise U5 will get hot.
2. Allowed maximum signal input voltage
is 50Vpk (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 (0V input).
Change [SEN1] or [SEN2] switch:
Press on [Reset] button:
C – Good
B – Too much
Reset
Button
Adjust sensitivity. The product of [SEN1] and [SEN2] settings makes the
actual sensitivity which is displayed at the lower-left corner of the panel.
Perform a system reset and re-boots the oscillscope.
0V Line Alignment
Sometimes you may find the 0V 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 “0V 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.
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.
Au to 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 M ode
In normal mode oscilloscope will only perform display
refresh when there are triggers. If no triggers happen
waveform display will stay unchanged.
Specifications
Max realtime sample rate
Analog bandwidth
Sensitivity range
Max input voltage
Input impedance
Resolution
Record length
Timebase range
Trigger modes
Trigger position range
Power supply
Current consumption
Dimension
Weight
1MSa/s
0 -- 200KHz
10mV/div - 5V/div
50Vpk (1X probe)
1M ohm/20pF
12 bits
1024 points
500s/Div -- 10us/Div
Auto, Normal, and Single
50%
9V DC (8 – 12V)
~120mA
117 x 76 x 15mm
70 gram (without probe)
Single M ode
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.
Normal and single modes are useful for capturing sparse
or single waveform.
Page 3
5
4
3
**
TP1
DC 1
J1
BNC
SW1A
These voltages wer e measured
when SW1 is at GND position.
C2
2
GND 4
0.1u
220pF
SEN1
SEN2
R1
100K
10mV
1
C3
3pF
0.1V
3
1V
4
R2 1.8M 1%
D
AV+
2
+
C5
1pF
2
10
+
9
-
4
10
VSENSEL2 11
VSENSEL1 12
CPLSEL
13
TP11
14
TP12
15
TP13
V-MON 16
TESTSIG 17
TRIG
29
TX1
30
RX1
31
USBDM
32
USBDP
33
SWDIO 34
SWCLK 37
LED
38
TP3
8
R12
120
C8
120pF
R7
AVR9
1K
R10
3K
AV-
R11
1.5K
AV+
R20
10K
7
V3
100K
TP4
AV+
R23
5
10K
5
TP6
SW3B
6
7
R19
1.5K
8
R14
AV+
C7
120pF
CPLSEL
18
19
20
39
40
41
42
43
TL_PWM
45
VGEN
46
LCD_nRD
21
LCD_nRESET 22
BTN4
25
BTN3
26
BTN2
27
BTN1
28
TP7
R22
1.5K
20K 1%
SW1B
6
VSENSEL1
6
R24
TP8
R13
120
R25
1.5K
8
3.3K
VSENSEL2
12
+
13
-
14
U2D
TL084/SO
AV+
C10
0.1u
LCD_nCS
LCD_RS
LCD_nWR
AV-
TP5
TLVL
JP3
C11
C9
0.1u
TP33
J4 USB_mini_B
VBUS
DD+
ID
GND
USB
Buttons
R31 1.5K
1
2
3
4
5
R29
R30
22
22
USBDM
USBDP
BTN2
+
7
PB0
PB1
PB2
PB3
PB4
PB5
PB6
PB7
PB8
PB9
PB10
PB11
PB12
PB13
PB14
PB15
VBAT
1
VDDA
9
+3.3V
BOOT0
J2
C14
VSSA
8
VDD_1
VDD_2
VDD_3
24
36
48
PC13/TEMPER/RTC VSS_1
PC14/OSC32_IN
VSS_2
PC15/OSC32_OUT VSS_3
23
35
47
R28
1
2
LED-K1
LED-K3
IM3
DB0
DB2
DB4
DB6
LCD_nRESET
JP6
10K
TESTSIG
R26
1
3
5
7
9
11
13
15
17
19
21
23
25
27
29
31
33
35
37
39
JP5
SWDIO
SWCLK
R35
1K
GND
+3.3V
V+
+
1
C22
100uF
3.3V
9.3V
1
3
2
V+
C19 +
100uF
TP20
3
VIN
2
GND
L3
100uH
+5V
U5
VOUT
LM78L05/T92
1
5V
1N5819
C24
C21
100uF
L1
100uH
IN
OUT
3
*
AV-
C15
0.1u
L4 100uH
+3.3V
+ C26
100uF
+3.3V
C
C16
C17
C18
0.1u
0.1u
0.1u
+3.3V
Q2
9014
+
TP27 TP28 TP29 TP30
0.1u
VGEN
2
C23
R39 0.1u
10K
R40
470
+3.3V
R41
10K
R42
1K
0.8V
*
4
J7
J8
1
2
1
2
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
LCD_RS
LCD_nRD
+3.3V
B
LED-A
LED-K2
LED-K4
V+
R36
180
DB1
DB3
DB5
DB7
+3.3V
LCD HEADER
Notes:
1. Part values used
could be different to
the values shown. Please refer to part
list.
2. Parts in dash-line boxes are SMD devices.
-1.4V
DC 9V
5
-5V
U4
79L05/TO92
C25
100uF
100uF
* 6.4V
AV+
C20
2
R38
1.5K
*
TP24
TP26
TP25 V-
1
L2
1mH/1A
8.6V
+
-
*
8.3V
R37
-8.1V
D1
2
10K
A
D2
1N4004
0.2V
3
LM1117 -3.3/TO263
*
J10
1
*
*
Q1
8550
8.6V
TP23
2
4
+
JP4
J9
1
2
*
TP22
U3
+
-
SW8
0.1u
+3.3V
470
LCD_nCS
LCD_nWR
IM0
+3.3V
10K
+
TP21
VOUT
VOUT
D
1K
TP10
+3.3V
VIN
R27
J3
1
2
3
4
Test Signal Terminal
TP16
TP17
3
44
LCD Module Connector
J6
J5
Caution:
Power supply voltage can
not be higher than 12V.
22pF
JP1
D3
R34
SW7
Power Supply
C13
STM32F103Cx
+3.3V
BTN4
SEL
RX1
TX1
nRST
LED
BTN3
-
1K
1K
22pF
Y1
8MHZ
PD0/OSC_IN 5
USE SWD DE BUG
MODE ON LY
SW5
R32
R33
PD1/OSC_OUT
SW4
TP14
TP15
B
1
2
3
C12
6
PA0
PA1
PA2
PA3
PA4
PA5
PA6
PA7
PA8
PA9
PA10
PA11
PA12
PA13
PA14
PA15
0.1u
SW6
Uart
2
3
4
R16
100K
SWD Port
BTN1
OK
Trigg er
Level
AV-
Analog Channel
DB0
DB1
DB2
DB3
DB4
DB5
DB6
DB7
JP2
1K
8
3.3K
R15
SW2B
5
R5
30pF
3.3K
X5
ADCIN
120
-
7
X2 3
300
**
1.6V
7
1
AV+
R6
AV-
R21
R18
-
TP9
U1
V2
R8
C6
C
6
30pF
AV-
10K
+
AV+
U2C
TL084/SO
SW3A
1
180
R4 2M 1%
R17
5
R3
200K 1%
C4
U2A
TL084/SO
SW2A
2
X1
AV+
U2B
TL084/SO
1
MCU
**
0V
V1
TP2
AC 3
C1
3
2
CPL
AIN
V-MON
A
TP31
TP32
These voltages are power volt age dependent. The
values shown were measured at 9.3V power voltage.
3
2
1
Page 4
5
4
D
3
2
DB0
DB2
GND1
nCS
nWR
IM0
YU
YD
LED-K1
LED-K3
IM3
DB10
DB12
DB14
DB16
nRESET
VCC3
DB5
DB7
LCD1
C
B
39
38
DB0
DB1
DB2
DB3
GND
VCC
CS
RS
WR
RD
IM0
XL
YU
XR
YD
LED-A
LED-K1
LED-K2
LED-K3
LED-K4
IM3
DB4
DB10
DB11
DB12
DB13
DB14
DB15
DB16
DB17
RESET
VCC
VCC
GND
DB5
GND DB6
GND DB7
DB0
1
DB1
2
DB2
3
DB3
4
GND1
5
6 VCC1
nCS
7
RS
8
nWR
9
10 nRD
11 IM0
12 XL
13 YU
14 XR
15 YD
16 LED-A
17 LED-K1
18 LED-K2
19 LED-K3
20 LED-K4
21 IM3
22 DB4
23 DB10
24 DB11
25 DB12
26 DB13
27 DB14
28 DB15
29 DB16
30 DB17
31 nRESET
32 VCC2
33 VCC3
34 GND2
35 DB5
36 DB6
37 DB7
J1
1
3
5
7
9
11
13
15
17
19
21
23
25
27
29
31
33
35
37
39
1
DB1
DB3
VCC1
RS
nRD
XL
XR
LED-A
LED-K2
LED-K4
DB4
DB11
DB13
DB15
DB17
VCC2
GND2
DB6
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
D
C
HEADER 20X2
DB0
DB2
GND1
nCS
nWR
IM0
YU
YD
LED-K1
LED-K3
IM3
DB10
DB12
DB14
DB16
nRESET
VCC3
DB5
DB7
2.4" TFT
J4
1
3
5
7
9
11
13
15
17
19
21
23
25
27
29
31
33
35
37
39
DB1
DB3
VCC1
RS
nRD
XL
XR
LED-A
LED-K2
LED-K4
DB4
DB11
DB13
DB15
DB17
VCC2
GND2
DB6
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
B
HEADER 20X2
JP1
A
J2
J3
1
2
1
2
GND1
TP1
TP2
TP3
JP2
TP4
A
Title
GND2
2.4" TFT BASE
Size
A
Date:
5
4
3
Document Number
Rev
00A
105-13700-00A
Saturday, August 23, 2014
2
Sheet
1
of
1
1
Page 5
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Page 6
DSO138 SMD Part List ( Pre-soldered )
Type
Resistor
Resistor
Resistor
Resistor
Resistor
IC
IC
IC
Descriptions
10K, 0805
3.3K, 0805
1.5K, 0805
1K, 0805
22, 0805
STM32F103C8, QFP-48
TL084, SO14
LM1117-3.3, TO263
Qty
6
3
4
4
2
1
1
1
Part Number
R17, R20, R23, R34, R35, R41
R18, R21, R24
R19, R22, R25, R31
R27, R32, R33, R42
R30, R29
U1
U2
U3
Remarks
Pre-soldered
Pre-soldered
Pre-soldered
Pre-soldered
Pre-soldered
Pre-soldered
Pre-soldered
Pre-soldered
Page 7