FNIRSI 2D15P 100MHz Digital Oscilloscope Multimeter DDS...

Most Helpful Review

"I personally don't like the all in one kind of test instruments, usually they do everything but nothing really well. However, electronics have changed quite a bit, now there is large number of people in this industry and hobby who use IOT, embedded systems, Arduino, esp32 etc and never deal with anything pure analog at component level. Plug and play modules are common. In those setup this kind of test instruments are good, they do everything to a level needed.This FNIRSI 2D15P is a compact test instrument that provides a multimeter, signal generator and oscilloscope, all in one. It doesn't take too much space on bench or tool bag (more later). It does these tasks ok for most use cases. Let's look at these separately.Multimeter: the interface is typical of FNIRSI and similar brands, quite intuitive. It mostly work as expected. An auto mode switches automatically for volt and resistance, perfect for newbies not blowing up the meter. A small graph and min/max is great. However there is no manual scale selection. Measuring 10pf capacitor stays on last digit, you can't trust that. The biggest problem, the manual doesn't mention precision and accuracy in the specification, that's not acceptable for a test instrument.Signal generator: mostly work fine, however if you select the voltage range below 0.3v and frequency up to few hundreds kilo hertz, sine wave is not smooth. You can see in the picture the waveforms (100khz, 0.1v sine wave) from this unit vs tinySa ultra. I am not sure if it can be fixed with software update or the issue is with smoothing circuits.Oscilloscope: worked surprisingly well, as I was quite skeptical about it. In a single channel it worked quite well up to 99MHz. I had wrong frequency display at 100MHz, few times. I didn't calibrate the setup for actual test etc, but in general the display and measurements seemed right. Having some quick function switches and dials are good addition. PC connectivity is limited as storage device, no software or control.There is a save button which basically saves current screen image as bmp. The is no option to capture the data for any future analysis. When connected to computer the device appears as a drive so you can pull the images. Firmware update is also done by dropping the file to this drive.The fan on the back of device runs continuously and is louder than my laptop. Also during my testing once the device automatically shut down without any notice or error of any kind. I am assuming this was probably thermal shutdown, I had DDS and oscilloscope working then.The kit doesn't include a case, given it's shape and size, throwing it into a bag is not good idea.Overall it's a nice compact all in one test instrument for quick measurements. However it will not replace a good oscilloscope or multimeter if you are in serious component level analog/RF electronics. Also at 200 it seems expensive when you can get a nice 100mhz oscilloscope from reputed brand for about 300+ with better sampling, controls, accuracy, pc software and guaranteed accuracy and precision."