Products > Test Equipment
MSO5000 Bode Plot Capability: Is it Good Enough? [Many tips about a 1st scope]
baldurn:
--- Quote from: nctnico on October 09, 2022, 07:16:06 pm ---From what I have seen over the years is that older equipment tends not to be designed with acoustic comfort in mind.
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Or sadly just older designs even though the instruments are sold as new. Or even new designs. I own multiple new instruments from Siglent and some of them are silent with clearly temp controlled fans. Others clearly have no fan controller and just run at full blast at all times. It may be several design teams and the guy that cared only works on one of the teams :-)
An instrument that runs the fan at full blast will have thermal limits that allow one to install a controller to regulate that down in a normal office. The thing will be designed to run in a desert country, and if you do not happen to be in such a location, it will have more airflow going than needed.
People suggest replacing the fan but my first choice would be to install a fan controller. The existing fan might be just fine when not at max rpm.
nctnico:
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.
2N3055:
--- 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.
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LOL, almost verbatim what I wanted to write.... I agree.
Also sometimes it is not even about evacuating air from the case but mixing it inside to even out hotspots...
baldurn:
--- 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.
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If all else fails you can use ambient temperature. My Siglent SDM 3055 appears to run the fan at full blast always. It is specified as "Full accuracy from 0 °C to 50 °C, 80% RH and 40 °C, non condensing". 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?
Just don't turn it all the way down. 50% removes most of the noise.
Of course they also specify aging depending on temperature, and so allowing higher temperature will increase aging. That would be a tradeoff you need to decide on. Maybe also the reason they run the fan at max is so they can get slightly better numbers in the datasheet regarding aging.
Martin72:
--- 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.
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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°.
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