Products > Test Equipment

Hantek DSO2xxx schematics

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pcprogrammer:
I received the cable and have things setup to do measurements. Will see if I can find which setting controls this.

Edit: Found what is controlling that signal I named CHANNELx_FILTER. It has to do with the sensitivity. When you set the input sensitivity to 2 volts per division or below the relay is turned off. When you set it to 5 volts per division or above it turns on.

Looking at the schematic, it does add a resistive divider to the signal path. But also additional parallel capacitance. Guess I should rename the signal.

Edit2: The signal I named CHANNELx_X is indeed the 20MHz bandwidth limiting filter.

Also looked at the touch panel RESET and INT signals and these indeed have the LCD sync pulses on them. So to allow the touch panel to work within the Linux system a change to the LCD driver code or setup would be needed.

DavidAlfa:
I tried disabling sync signals in PD config register 2 (PD20 & PD21 = disabled):

--- Code: ---devmem 0x01C20874 32 0x00772222
--- End code ---
LCD kept working normally, so you can keep going.

Just to ensure the register was working, I disabled LCD_DE:

--- Code: ---devmem 0x01C20874 32 0x00227222
--- End code ---
Then LCD_CLK :

--- Code: ---devmem 0x01C20874 32 0x00222722
--- End code ---

Both stopped the LCD from working correctly.
Disabling any Data pin affected the colors, as expected.

pu6k1n:
Where did 1 GS/s come from if the ADC08D502 has a maximum conversion rate per 1 channel: 500 MSPS??? According to the scheme, the connection of both channels is absent. There is an input multiplexer inside the ADC, but is there a word about it in the datasheet? :-//

pcprogrammer:
That is why in the schematic the ADC08D500 is used. This one has the ability to sample one channel with both ADC's

The scope can only do 1GSa/s on a single channel. The moment you enable two channels the rate drops.

A copy of the datasheet is here:

https://raw.githubusercontent.com/pecostm32/Hantek_DSO2000/main/Datasheets/adc08d500.pdf

pu6k1n:
What is the P5 "FEL" button for? Why stop memory?

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