DSO2D15 DC input offset

2HappySundays

Hi all,

I recently purchased a DSO2D15 oscilloscope. While simple, it generally does its job ok.

The first glaring issue I notice is a large DC offset on the inputs. It was initially over 250mV on the 10V scale, but was still considerable AFTER RECALIBRATION.
Recalibration helps for the lower ranges but is insufficicent for the higher.

Of course on-screen you can adjust the trace position but the offset is taken into account when using the MEASURE function, rendering it very inaccurate.

Other scopes have a much longer recalibration process and I believe store an offset for each range. Hantek should try that instead of one offset for all ranges.

Any tips to improve this?

Any help much appreciated.