Can anyone confirm if these have a massive output capacitor
I would of expected to see a rubber cap on the toroidal even before Dave rasied the issue, it was that obvious.
You can can set current limit to say 0.01A and output voltage to 25V, repeatedly short the PSU output and do spot welding! Some PSU's have huge i.e. >680uF output caps that make CC mode kind of a joke.
You can can set current limit to say 0.01A and output voltage to 25V, repeatedly short the PSU output and do spot welding! Some PSU's have huge i.e. >680uF output caps that make CC mode kind of a joke.That will be the main reason for the postregulator. Without it you'd need a pi filter with a couple of honkin' great caps to get the ripple low enough for a lab spec. That and the postreg can cut the current quickly in a s/c condition, which a buck converter cannot because of the stored energy in the inductor.
BTW if if output reverse polarity protection diodes are used, I'd like to see a polyswitch or fuse as well. Otherwise an accidental reverse current into the output terminals could damage the wiring or PCB. People do sometimes use bench PSUs to charge batteries... and sometimes they get them the wrong way round.
At 23 minutes I think you mean "convection", not "radiation". If heat is radiating out of the holes in the case then you've got a big problem.
I'm a bit puzzled about their architectural choice of the big-ass, custom-wound mains transformer and a buck preregulator afterwards.
Why didn't they use a common flyback or forward regulator directly from mains as preregulator for each channel? That way they wouldn't need the big and probably expensive transformer but still had individual isolated channels with preregulation. The transformers for a flyback or forward can be much smaller and thus cheaper because of the higher frequency.
I put this on youtube but... The case there is powder coated. Unless someone deliberately removes the coating and puts a heavy object there it's a non issue. Since someone would have to remove the coating it would also not be their fault, that's a VERY durable coating.
I put this on youtube but... The case there is powder coated. Unless someone deliberately removes the coating and puts a heavy object there it's a non issue. Since someone would have to remove the coating it would also not be their fault, that's a VERY durable coating.
I put this on youtube but... The case there is powder coated. Unless someone deliberately removes the coating and puts a heavy object there it's a non issue. Since someone would have to remove the coating it would also not be their fault, that's a VERY durable coating.
For a linear power supply, I was expecting to see 50/60Hz rectifiers and huge filtering capacitors near the big toroidal mains transformer.
If the ones in the video are linear power supplies, how come each channel have a ferrite donut transformer? Wouldn't that turn them into switching power supply? And, if we use high frequency anyway for the smaller ferrite transformers, why bother with the huge toroidal mains transformer anyway, what am I missing?
... what would point to some sort of switching regulator is the relatively high broadband noise level. Not sure either, there is no schematics available, I suppose.
There is an Wifi Card installed (ie. You paid for the hardware) , but you need to buy a license to activate it.
Their BOM cost goes lower if they sell the Supply without the (off the shelf)card?
Or is easier just make a single DFM for the supply?
Or can the make up the cost if the sell wifi sw / activation code separately to 50% of their consumers.
These questions are going to make me up tonight!!
There is an Wifi Card installed (ie. You paid for the hardware) , but you need to buy a license to activate it.
Their BOM cost goes lower if they sell the Supply without the (off the shelf)card?
Or is easier just make a single DFM for the supply?
Or can the make up the cost if the sell wifi sw / activation code separately to 50% of their consumers.
These questions are going to make me up tonight!!Some would argue that everyone gets the upgraded hardware for a lower price, because a few people pay extra. By having some people pay for the add-ons, the final price for the cheap model can be lower. Its a somewhat complicated affair which isn't as black and white as it initially seems.
I don't know what it is about R&S equipment, but the slightly understated and fairly German design always appeals to me in ways I can't quite explain. Nothing flashy or attention grabbing, just a measured "Want to get work done? Let's get going".