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| DC-Load wanted(Siglent SDL1020X-E found) |
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| Martin72:
Edit: Title changed Hi folks, I have almost everything a "private laboratory" needs, except for a spectrum analyzer and - loads... I would like to change that first before I buy an SA. First a DC load, I still have to think about AC, maybe I'll build it myself. So DC load... Which one... I would like to have one that I can regulate precisely to the mA, so that if I set a 5mA load, for example, it stays that way. Then I should also be able to make load jumps with it to test control loops. Furthermore, it should not interfere too much in order to be able to make reasonable ripple measurements. Maximum current...Hm...Let's say 20A, more if you like. Voltage 50V, also more if you like. Price...Doesn't necessarily have to be the cheapest, but as cheap as possible under the conditions mentioned above, just the usual. ;) Make suggestions, I don't care about the brand. Oh yes, and sensible connections would not be bad, preferably terminals where you can also connect 4mm bananas. Thx in advance, Martin |
| blackdog:
Hi Martin, It is difficult to find a "Dynamic Load" that can handle small currents and e.g. 40-Ampere properly. It's a bit like with LAB power supplies you need several for certain applications. Often you want to work with small currents and rapidly varying loads like microcontrollers and i.o.t devices. So you want a good fast response, the dynamic loads that can handle large currents usually have an RC combination across the output terminals, because of this the peformance at smaller currents is not as good anymore since the low impedance vnadit RC network. Maybe build something yourself where you can control some properties yourself? For some inspiration take a look at this topic of mine on a Dutch forum for a small fast active load. https://www.circuitsonline.net/forum/view/121338/1 And a nother one https://www.circuitsonline.net/forum/view/106770/1 And one special https://www.circuitsonline.net/forum/view/153438 Have fun! Kind regards, Bram |
| Martin72:
Hi Bram, Very nice...Must diving deeper into it, thanks for the links. :-+ The topic came up because I realized yesterday that I don't actually have any electrical loads here, except for something really bad from the China man. In my test field we have umpteen loads from "Zentro", as well as two from Rigol, which a developer colleague once bought for a project. I had a brief look at them, you can set the risetime there, which I found interesting, but the operation itself is terrible. Then we now have loads from Statron, for DC and AC, whereby the AC load is pretty cool: You do have a fine pot to slowly ramp up the load, but when you turn that, it clicks inside- It switches real resistors. ;) I think I'm going to have to go in two directions, one for larger flows and one for smaller and more dynamic flows. As I said, I'll take a closer look at your design*, don't be surprised if I report on it in this thread, because that's when I started to rebuild it. 8) Martin *(A few years ago I built myself a small load with several inputs because the test object had several outputs. Quite simple with an OP amp and "afterburner". The set currents always drifted away, so it ended up in the trash instead of thinking about why.) |
| tszaboo:
Does the Keithley DC Electronic Load Series 2380 fit the budget? I have that at work, nice unit. Also tests batteries. For anything complicated, more than two current levels, you need to script it though. I plan to buy a Riglol DL3000 at home, no experience with it yet. The base price is attractive. |
| Martin72:
Hi, --- Quote ---Does the Keithley DC Electronic Load Series 2380 fit the budget? --- End quote --- 3300€.....No. ;) --- Quote ---I plan to buy a Riglol DL3000 at home, no experience with it yet. The base price is attractive. --- End quote --- Maybe it's also something for me, for larger loads. As I mentioned, we have two of them at work, I'd have to take a closer look at how they work and if you want to know anything specific about them, I can test them. |
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