JYE Tech DSO150
Pros: nearly complete soldered kit with housing.
- good user interface (software)
with modded software from toshi with data export.
Portable operation possible, with battery pack (power consumption 120mA @ 9V)
Good documentation - manual, schematics, firmware update
Cons: Limited bandwidth of 200 KHz.
1 channel only.
- Number of Channel: 1
- Analog Bandwidth: 0 - 200KHz
- Sensitivity: 5mV/Div - 20V/Div
Sensitivity error: < 5%
- Resolution: 12-bit
- Input Impedance: 1M ohm
- Maximum Input voltage: 50Vpk
- Coupling: DC, AC, GND
- Max Real-time Sampling Rate: 1Msps
- Timebase: 10us/Div - 500s/Div
- Record Length: 1024
- Trigger Modes: Auto, Normal, Single
- Trigger Types: Rising/falling edge
- Trigger Position: 1/2 of buffer size fixed
- 2.4-inch color TFT LCD with 320 x 240 resolution
- 9V DC (8 - 10V acceptable)
- Supply Current: 120mA @ 9V
- Dimension: 115mm X 75mm X 22mm
- Weight: 100 gram (not including cables and power supply)
In order to make the DSO more useful, tree modifications are made.
Rechargeable Battery Pack
On Ebay.de you can buy a 6 x AA battery housing (ID number 162434646097, 1.6 EUR) with 15 cm wires and an ON-OFF sliding switch. To connect to the DSO150 you need a DC plug 5.5/2.1 mm (e.g. ebay.de ID no. 152190640539, for about 10 pc. 2 EUR).
Because of the low voltage (7.4 V) you need to short the inverse-polarity protection diode. See the picture on the right for the wiring. The voltage regulators 78L05 need minmum 7 V for the voltage regulation. So, be careful to do not inverse the polarity of the power supply wiring.
USB - UART Converter
In order to allow a firmware update, or to capture waveform data via USB connection (needs toshi firmware 60B), you need to adopt an USB-UART converter. Fortunately you get on ebay.de (ID no. 381765079624, 1.15 EUR) a little module which just fits into the DSO150 housing, and has on the data lines the necessary 3.3 V level. The USB plug is micro USB.
In order to make the firmware update easier, the solder jumpers J1 and J2 are routed with wires to 2mm spacing posts, see the picture on the right. I am using wire-wrap wires, because they are thin and have a good isolation.
I have mounted the posts with hot glue to the board.
Take care about the position, if you place the posts more to the right, the electrolyte capacitors of the analog board are in the way.
A nice guy provides an extended firmware 60B. You can download the software from toshi with source code. The benefits are:
Show the trigger voltage in the lower right corner of the screen.
Allow a waveform data export via USB port:
UART parameters: 38400 baud, 8N1
The telegram is coded in ASCII and with Return + Line Feed at the line end.
1st line has the time interval in seconds.
1024 lines with the waveform data in volt.
OK, you can download the waveform data, but how can you visualate it? The necessary steps are:
Capture the waveform data to a text file.
Start the program first, waiting for the data.
Push the ADJ button for the start of the data transmission.
Convert the waveform data to a .csv (Comma Separated Values) file.
Take care to localize the decimal point.
Visualise the .csv file data with the program GNUplot.
Take care to include the actual Date & Time in the plot.
I liked to use a software which is cross platform (Linux, Mac OS, Windows), so I decided for Python.
The five major tasks in the software are:
Wait up to 60 seconds for the start of the data transmition.
Read the data into a list (real time), then write all into a text file.
Read the data file, then calculate the time row, localize the decimal point and write the .csv file.
Prepare a parameter file for program GNUplot. Add Date & Time.
Call GNUplot with the parameter file.
The terminal command line looks like:
$ python dso150-p23.py -pd # option -p means capture data and write a .csv file # option -d means plot data
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-- RudolfReuter 2017-10-07 13:21:29