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the waveform looks fine. I have independently confirmed the input signal is 100hz sine wave.

What the device seems to report is half the correct frequency and sometimes 0.68 of the correct frequency.

When I drive it with 100hz, it reports either 50hz or 68hz

when I drive it with 50hz UK mains ...

I have tried a different cable, port and computer and it still performs in the same erroneous way. Looks like a hardware fault.

I have also tried with my own generated sine wave. I created a WAV file with a 100hz pure sine wave and verified it with a frequency analysis app. I then played it through a DAC and into the DSO-2810R. The MI software reports a peak at 50hz and sometimes jumps to 68hz.

I have tried to use it for a day or so. I supply a repeating signal from a sound card. When I launch the application, everything works fine. However, if I try to change the sample frequency or capture window size, roughly 50% of the time, the signal disappears and the software waits to trigger. The ...

I have now tried Earth Grounded Single Ended Measurement, and it still says the peak frequency is 25hz

I have followed the video on mains THD measurement. I used the ground differential measurement method on the wall outlet in the UK.

It reports the largest frequency being at 25hz and sometimes jumping to 34hz. This makes no sense to me, as I would have thought that a distorted 50hz sine wave would ...