Products > Test Equipment

DC Load - I need some guidance

<< < (6/10) > >>

nctnico:

--- Quote from: Martin72 on June 11, 2024, 09:08:12 pm ---I've been working with it a bit, it's making a good impression so far - but I'll do a proper test with it when time finally allows and post it in the forum.
I have all the resources for it, I still have to get a battery, if you want to determine the ripple of the load, a regulated power supply makes little sense as a source.
When I have that, I'll get started.

--- End quote ---
Well, for 50Hz ripple, a decent power supply should have a low enough ripple & output impedance to test. It would be interesting to know whether the Siglent loads have the 50Hz current ripple or not.

Martin72:
We will see.
My fear is that when two regulated systems "meet", this can lead to interactions.
I also have a few linear "iron" power supply units, but they can only handle a maximum load of 3A, which is not a lot.

nctnico:

--- Quote from: Martin72 on June 13, 2024, 10:05:04 pm ---We will see.
My fear is that when two regulated systems "meet", this can lead to interactions.
I also have a few linear "iron" power supply units, but they can only handle a maximum load of 3A, which is not a lot.

--- End quote ---
You won't need a lot of current to show the DC load regulation ripple. 100mA is more than enough; otherwise you'd likely be swamping the ripple you want to measure.

mvno_subscriber:
I got the unit yesterday. I won't be able to test it properly before next week, but wanted to hook it up and just fiddle around a bit. Now, two things struck me, one of which I'm not sure what to do with.

1. The fan is always on. It's not super loud. It's a bit quieter than my oscilloscope (Rigol). It sucks, but I'll probably be able to live with it. Most likely I'll have my scope powered up whenever I use this thing anyway.

2. There's a really high pitched noise coming from the unit. It's higher than your average CRT monitor whine. It's almost not a sound at all, and more a sensation. It's very fatiguing, almost nauseating. I downloaded a random FFT app on my phone, it registered a 15Khz spike at startup (which is clearly audible, sounds like something charging up), but then nothing. The nauseating sound has higher pitch than that, how much higher I'm not sure, but I assume it has to be quite loud for me to actually hear it. I mean, I guess I have a good ear, but I am 41 and have no illusions :D

I hope then that this whine is a fault, or that it will pass (is it possible?). If not, I'm not sure if I'll be able to live with it. Crossing my fingers 🤞🤞

2N3055:

--- Quote from: mvno_subscriber on June 14, 2024, 06:19:48 am ---I got the unit yesterday. I won't be able to test it properly before next week, but wanted to hook it up and just fiddle around a bit. Now, two things struck me, one of which I'm not sure what to do with.

1. The fan is always on. It's not super loud. It's a bit quieter than my oscilloscope (Rigol). It sucks, but I'll probably be able to live with it. Most likely I'll have my scope powered up whenever I use this thing anyway.

2. There's a really high pitched noise coming from the unit. It's higher than your average CRT monitor whine. It's almost not a sound at all, and more a sensation. It's very fatiguing, almost nauseating. I downloaded a random FFT app on my phone, it registered a 15Khz spike at startup (which is clearly audible, sounds like something charging up), but then nothing. The nauseating sound has higher pitch than that, how much higher I'm not sure, but I assume it has to be quite loud for me to actually hear it. I mean, I guess I have a good ear, but I am 41 and have no illusions :D

I hope then that this whine is a fault, or that it will pass (is it possible?). If not, I'm not sure if I'll be able to live with it. Crossing my fingers 🤞🤞

--- End quote ---

That whine is either coming from PWM for fan or from a switcher PSU. If it is there it won't get tired and go somewhere else....

Navigation

[0] Message Index

[#] Next page

[*] Previous page

There was an error while thanking
Thanking...
Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod