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Rigol DHO914S high temperature / overheating probe inputs

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maher8:
Hi guys!
Yesterday, my new Rigol DHO914S oscilloscope arrived. It works well, and I didn’t experience any software bugs during my short testing time. However, I noticed that the unconnected probe inputs on the oscilloscope feel hot to the touch (the AWG output on the back too). It causes pain if I hold them for too long, at around 50-60°C. The oscilloscope is warm on the outside. Is this normal for this oscilloscope? I have limited experience with oscilloscopes as a firmware developer, but the probe inputs on any scopes I’ve worked with before never got warm, let alone hot. Is this a typical Rigol issue, or should I return it before something burns due to the high temperature?

The cooling fan is working, the oscilloscope is on my desk with good airflow, my room temperature is around 23-24°C, and I’m using the standard power adapter that came with the scope. The scope was running for 2 hours, and the temperature remained stable, with the probe inputs staying at 50-60°C the entire time.

Fungus:
Doesn't sound normal to me.

My DHO804 BNCs don't get much above ambient.

Elextro:
My oscilloscope, which is a DHO 802, also get a little hot at the BNC inputs and at the rear AWG output. It is not a very high temperature, but I confirm that it does heat up. I think that the front inputs get hot because they are screwed to the frontal metal chassis which acts as a heatsink and shielding at time. Greetings

Fungus:

--- Quote from: Elextro on September 25, 2024, 09:38:18 am ---My oscilloscope, which is a DHO 802, also get a little hot at the BNC inputs and at the rear AWG output. It is not a very high temperature, but I confirm that it does heat up. I think that the front inputs get hot because they are screwed to the frontal metal chassis which acts as a heatsink and shielding at time. Greetings

--- End quote ---

They're above room temperature, sure, but do they burn your fingers?

maher8:
Little status update...
Yesterday it was a little late when I was testing this. At the end, I did firmware update to the newest version available, as last resort.

Today, the scope is performing normal. I tested it with IR thermometer and it's 32-33°C at probe inputs, after 2 hours of working. It is warm to the touch, but nothing too hot.
It looks like firmware update did something good. Maybe something stuck in a loop. I will check temperatures every now and then, and post update if it goes wild again.

Thanks for useful info!

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