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MSO5000 Bode Plot Capability: Is it Good Enough? [Many tips about a 1st scope]

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rf-loop:

--- Quote from: Martin72 on October 10, 2022, 08:52:12 pm ---
Can´t imagine for example that the adc´s got a internal sensor like cpus got, makes me curious to look where my HD got the sensor placed.
I´ve got a feeling that most regulator circuits are measuring simply the ambient temp on the board.


--- End quote ---

I do not mean how fan temp control is done here but SDS2kX HD ADC have temperature sensor diode.
ADC data sheet page 66.: 8.1.5.1 Temperature Sensor

...has an on-die temperature diode connected to pins Tdiode+/- which may be used to monitor
the die temperature.
There is, in datasheet, also more text about using this.




Disclaimer/note: I do not claim or say here anything that Siglent used this method as shown here or for this purpose!

But ADC includes this feature.

Using, for example, the LM95235/95213/95214 circuit, and this particular diode inside ADC  as sensor, can do many kinds of temperature monitoring and control accordingly.

balnazzar:

--- Quote from: Martin72 on October 10, 2022, 08:52:12 pm ---
Would be interesting to know where the tempsensor is placed on a scope which got fancontrol.
Can´t imagine for example that the adc´s got a internal sensor like cpus got, makes me curious to look where my HD got the sensor placed.
I´ve got a feeling that most regulator circuits are measuring simply the ambient temp on the board.


--- End quote ---

It shoud be sufficient to measure the ambient temp over the board, or even the general ambient temp. Indeed, the manufacturer should know how the single components thermally behave as function of ambient temperature.

nctnico:

--- Quote from: Martin72 on October 10, 2022, 08:52:12 pm ---
--- Quote from: nctnico on October 10, 2022, 11:23:59 am ---A fan controller is an  option but the problem is where to locate the temperature sensor. There may not even be a single place because temperature can depend on the type of load/use of test equipment.

--- End quote ---

Would be interesting to know where the tempsensor is placed on a scope which got fancontrol.
Can´t imagine for example that the adc´s got a internal sensor like cpus got, makes me curious to look where my HD got the sensor placed.
I´ve got a feeling that most regulator circuits are measuring simply the ambient temp on the board.


--- Quote from: baldurn --- Currently the temperature in my lab is 19 degrees celsius - who thinks the thing really needs to run at full blast as designed for 50 degrees?
--- End quote ---

The specified ambient temperature based on the "full blast" fan, when you reduce the fanspeed to the half it will not mean that the max ambient temp will also reduced to the half, to 25°.

--- End quote ---
If you look at heatsink datasheets, you'll see that the relation between airflow and thermal resistance is not linear at all. And then you need to account for the buildup of dust that increases the thermal resistance. All in all it is not very straightforward to simply reduce the airflow.

Martin72:
I know this, see my post you've quoted.

Fungus:
I just found this...

https://www.eevblog.com/forum/testgear/3d-printable-case-for-analog-discovery-2/

I put it in a separate thread to make it easier to find via search.

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