Frequently Asked Questions
Changing the measurement range
The input range of the USB scope can be changed by adding two resistors to the
input line of the scope. Schematic below shows the electrical diagram of the input
circuit. Adding a resistor with a value of 10 kOhm and a resitor with value "R_in" will change the full scale of the scope.
Check the table below to find the value for "R_in" that creates the measurement range you need.
Table below shows the values to be used for "R_input" to extend the measurement range.
R_in value | Measurement range |
no resistor | 0 V to +5V |
10 kOhm | 0 V to +10 V |
20 kOhm | 0 V to +15 V |
Error: "No USB scope found. Check your hardware"
This message occurs if the scope hardware is not conneced before the program is
started. Also this message can happen if the USB driver is not installed correctly.
If you open your "device" manager in Windows, you should see a serial device as shown below.
(number of the COM port may be different on your computer).