For general information, I received a DSO154PPro recently and noticed that the PCB was marked “V1.4”.
This has a few notable differences compared to the previous versions. The changes may be due to component obsolescence, functional updates and/or cost reduction.
- The generation of the negative power supply rail has been modified.
This now uses a similar arrangement to other Zeeweii models, with a switched mode step-up regulator followed by a step-down regulator. This may be to ensure correct behaviour at low battery levels. The large electrolytic decoupling capacitors associated with the previous switching regulator have been removed and since the updated regulators have a higher switching frequency, smaller ceramic capacitors have been used.
- The device used for the data acquisition and waveform generation has been changed.
The device is marked “AG32VF303KCU6”, which appears to be an MCU with a RISC-V core with RV32IMAFC support and should be suitable for signal processing applications.
- The ADC has been changed.
The device is marked “MS9280”, which is a 10-bit ADC. The least significant 2-bits are not connected. There is a minor change in the analogue circuit around the 74HC4051 multiplexer which may be related to the ADC update.
- The waveform generator output circuit has been modified slightly.
The resistor ladder network has been changed to discrete resistors and there are some modifications around the “8091” output amplifier.
I also own a Rigol oscilloscope which is more capable for higher frequency, complex triggering and serial decoding, but the DSO154Pro is still a handy pocket oscilloscope with built in waveform generation and has a quick and simple user interface.
There are freely available 3D printable case models, which I used to provide some degree of protection to the unit.
Overall, for the cost, the DSO154Pro provides excellent functionality and performance compared to other devices in the price bracket.