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Rigol HDO1000 and HDO4000 12bit oscilloscopes launched in China
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core:

--- Quote from: egonotto on December 14, 2023, 02:43:12 am ---Hello,

thank you for your answer. I used a T-piece with a 50 Ohm termination. The generator is a SDG6022X which had a different motherboard after a repair, with a SDG6052 license. I repeated the measurement with only channel 3 active and a sine wave with 4 Vpp.

At 1 KHz I measured 2 Vpp.
At 85 MHz I measured 1.4 Vpp.
At 100 MHz I measured 1.25 Vpp.
At 120 MHz I measured 1.03 Vpp.

Best regards
egonotto

--- End quote ---

I have about the same results, using 1Vpp :
https://www.eevblog.com/forum/testgear/hacking-the-hdo1khdo4k-rigol-12-bit-scope/msg5207655/#msg5207655
core:
I've made some tests regarding High Resolution 14bit/16bit vs normal.

Signal source SDG2042X
- ch1 : ramp, 1kHz, 10mVpp, symm 50%
- ch2 : pulse, 4kHz, 3mVpp, pulse width 1us, rise edge 8.4ns
- wave combine output

HDO1074 with 50Ohm terminator, aquisition 50mV, 5ms.
Trigger single, stop, then zoom in from 50mV/5ms up to 1mV/1us

The 3mVpp/1us pulse it's very clear even in normal mode.

pictures for normal mode:
core:
pictures for HiRes 14 mode:
core:
pictures for HiRes 16 mode:
core:
FFTs for the same signal, normal mode and HiRes16.
No difference.
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