The DSO138 digital oscilloscope is sold as a DIY kit. It is housed on one printed circuit board, and a TFT LCD display is connected to it with a separate mezzanine board. The oscilloscope is compact, very inexpensive and at the same time of sufficient quality. It has the function of storing the waveform, the function of displaying the parameters of the input signal, automatic, one-shot and normal operating modes. Bandwidth -200 kHz. Voltage resolution - 12 bits. Let's see how to assemble this oscilloscope correctly and quickly.
Necessary
- - Set with digital oscilloscope DSO138;
- - multimeter;
- - tweezers;
- - soldering iron;
- - solder and flux;
- - acetone or gasoline.
Instructions
Step 1
The DSO138 set is on sale in this form. The kit includes a printed circuit board itself with SMD components installed on it (there is also a type of kit where SMD components are not installed), a board with an LCD display, a bag with accessories, a cable with a BNC connector and "crocodiles", as well as assembly instructions and instructions on setting in English.
Having unpacked the kit, we proceed to the installation of radioelements on the printed circuit board.
Step 2
We will move strictly according to the instructions and observe the proposed soldering sequence. The lowest components are soldered first, then the highest.
The first step is to solder the resistors. There are many of them here, and many denominations. Be careful when soldering. There are no special features here.
Step 3
The next steps (2 and 3 according to the instructions) are soldering three chokes and two diodes. The chokes are the same, but the diodes are different, but in the same housings. In addition, the diodes are polarized. On the silkscreen of the board, the "minus" (cathode) is indicated by a white line, as well as on the body of the diodes themselves. So be careful.
Step 4
Next, we solder the quartz resonator (step 4 of the instructions) at 8 MHz. The polarity is not important.
Step 5
Next, we solder the mini-USB connector to the board and five clock buttons (steps 5 and 6 of the instructions). Both the connector and the buttons have specific dimensions of the case and pins, so it is impossible to confuse anything.
Step 6
Step 7 of the instruction is to solder the capacitors. There are many of them, and there are many denominations. But they are all non-polar and easy to solder. Remember to re-shape the leads before inserting the legs into the solder holes.
Step 7
The next step is to solder the LED. The long lead is the anode, plus. A hole with a square contact pad is intended for it.
Step 8
Now it's the turn of the white male power connector. We put it with its open part in the direction from the center of the board.
Step 9
According to steps 10 and 11 of the attached instructions, we install 2 transistors and 2 voltage regulators on the board. They are all different types, but in the same housings. Be careful when installing them on the oscilloscope board. Form the leads before installation and do not overheat them with a soldering iron.
Step 10
We install two variable capacitors.
Step 11
We mount a large inductor for the power supply filter.
Step 12
Next, install 6 electrolytic capacitors. It is important to observe the polarity during installation. The longer output is a plus. It fits into a hole with a square solder pad.
Step 13
We put a power connector on the DSO138 oscilloscope board. It has wide rather thick leads, it needs to be well soldered.
Step 14
Steps 16 and 17 of the instruction are soldering the pin headers and the corresponding pads to the DSO138 oscilloscope board.
Step 15
Install three movable switches SW1, SW2 and SW3. Then we mount the BNC connector. Its body is made of a thick layer of metal and is difficult to solder. Nevertheless, you need to solder it very well to the contact pads. This is the input connector and the soldering should be very good. Therefore, heat the thick pins of its case more.
In the next article, we will install a display on the DSO138 oscilloscope board, conduct a primary check of its functioning and setup.
