Products > Test Equipment
New Rigol HDO1000 12-bit DSO - BUGs
markone:
--- Quote from: markone on December 14, 2022, 04:28:04 pm ---Spotted right now another issue with Trigger with low level signal, i.e Sine 1MHz 50mVpp does not trigger with zero and negative thresholds (see attached image).
Rising threshold to 5mV and / or signal amplitude to 60mVpp scope starts to trigger ...
--- End quote ---
Recalled default setting, trigger problem disappeared ... :)
Fungus:
--- Quote from: tooki on December 14, 2022, 01:10:42 pm ---
--- Quote from: TK on November 12, 2022, 03:10:27 am --- The same with i2c, I have to set the threshold to 4.4V for the decoder to decode correctly (The i2c signal on the Arduino has a slow rise time due to internal resistor value).
--- End quote ---
FYI, you probably just need to add an appropriately sized pull-up resistor for your bus capacitance.
--- End quote ---
There's nothing "probable" about it. You're supposed to add external pullups. It's I2C 101.
TK:
--- Quote from: Fungus on December 15, 2022, 07:22:17 am ---
--- Quote from: tooki on December 14, 2022, 01:10:42 pm ---
--- Quote from: TK on November 12, 2022, 03:10:27 am --- The same with i2c, I have to set the threshold to 4.4V for the decoder to decode correctly (The i2c signal on the Arduino has a slow rise time due to internal resistor value).
--- End quote ---
FYI, you probably just need to add an appropriately sized pull-up resistor for your bus capacitance.
--- End quote ---
There's nothing "probable" about it. You're supposed to add external pullups. It's I2C 101.
--- End quote ---
Not sure, AVR microcontrollers have internal pull-up resistors and Arduino is using them on I2C lines and the values are not good for I2C, so it is I2C 101 to have pull-up resistors on the BUS, just not easy to have the right value when using Arduino boards.
Fungus:
--- Quote from: TK on December 15, 2022, 03:56:12 pm ---AVR microcontrollers have internal pull-up resistors
--- End quote ---
Yes, in the 30-40k Ohms range - for minimal low power consumption in low-power devices.
I2C signals needs fast rise times so you need a lot less resistance than that for it to work properly.
(or you can limit your bus speed to something slow that works with the Arduino's pullups)
Marchello:
DHO1074, firmware - 2.04
I have a problem with disabling the display of scales at the edges of the screen. If I turn them off in the menu (Display->Show Scale "Off") they turn off. But if I press Start or Stop Waveform Capture, the scales turns on by itself again!
I think it's not normal.
Can someone repeat this?
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