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Rigol DHO804 Test and Compare Thread

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core:

--- Quote from: Fungus on December 17, 2023, 09:07:18 pm ---
--- Quote from: core on December 17, 2023, 07:58:10 pm ---Personally, I would not change a fan without knowing that the new one does not have at least the same airflow or without comparing the measured temperature with a thermal imaging camera.

--- End quote ---

These have a single heatsink and can show their internal system temperature on screen. Thermal camera isn't really needed.

--- End quote ---

Depends. If there is a buck power supply outside the single heatsink and the airflow in the case is too low, an overheat and a fault in this regulator will cause a major malfunction. The voltage at the input can reach the output. I have seen laptops in this situation.

This may not be noticeable in the temperatures monitoring menu.

That's why I wouldn't change the cooling conditions without making sure I'm not missing something.
A functional noisy device is better than a silent "dead" one  ;)

Martin72:
Then it's really silent. ;)

Fungus:

--- Quote from: ebastler on December 18, 2023, 06:47:39 am ---
--- Quote from: Martin72 on December 17, 2023, 10:38:24 pm ---That's a bit meagre, actually too little.

--- End quote ---

Indeed, that's less than I expected. The DHO1000 dialog shows much more info.

--- End quote ---

Not really. All it says is that "ambient temp" is a degree or two less than chip temp.

What's "ambient temp" anyway? was that screenshot taken in a room at 45 Celsius?

Fungus:

--- Quote from: core on December 18, 2023, 08:03:57 am ---Depends. If there is a buck power supply outside the single heatsink and the airflow in the case is too low, an overheat and a fault in this regulator will cause a major malfunction. The voltage at the input can reach the output. I have seen laptops in this situation.

--- End quote ---

A 100mm fan stuck to the back is going to have far more overall airflow than that little fan stuck to the heatsink.

(which isn't directly moving any air in/out of the case at all, it just moves it across the heatsink and convection does the rest)

ebastler:

--- Quote from: Fungus on December 18, 2023, 12:31:44 pm ---
--- Quote from: ebastler on December 18, 2023, 06:47:39 am ---Indeed, that's less than I expected. The DHO1000 dialog shows much more info.

--- End quote ---

Not really. All it says is that "ambient temp" is a degree or two less than chip temp.

What's "ambient temp" anyway? was that screenshot taken in a room at 45 Celsius?

--- End quote ---

Umm -- when I look at the dialog, I also see temperature measurements for the ADC and (presumably) the leftmost and rightmost front-end amplifier?

The "ambient temperature" readings are obviously not room temperature, but apparently the immediate environment of the respective chips. I have wondered about those too: Did Rigol actually populate NTCs next to each of these four chips? It's the first model using the new chipset, so maybe they wanted to play it safe?

Not my own screenshot, btw. I took it from another thread which discusses tweaking the DHO1000 fan via its PWM control.

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