Author Topic: 3 channel PSU without problems (Read 6873 times)

Jan Audio · « **Reply #25 on:** March 16, 2019, 03:23:41 pm »

Quote from: 0culus on March 15, 2019, 02:18:15 am

I like the Keithley 2231A, got it new. It doesn't have quite as many features as the highest model so it was considerably cheaper. It gives you 30V/3A out of channels 1 and 2, 5V/3A out of channel 3. Can connect 1 and 2 in series or parallel to get 60V or 6A, respectively. Easy to save and recall configurations too.

I assume it has current limiting.
Looking good this one, i would go for that one now instead of the R&S.

ebastler · « **Reply #26 on:** March 16, 2019, 03:37:23 pm »

@Jan Audio, you seem to be looking exclusively at the two far ends of the spectrum: el cheapo "Peaktech" on the one end, and expensive established brands (R&S or Keithley) on the other end.

Nothing wrong with the established US and European brands, of course -- but you have already stated clearly that you cannot afford them. Hence, I think you should have closer look at the Chinese mid-range brands, like Rigol and Siglent. The Siglent SPD3303X-E, for example, should easily meet your requirements and is about half the price of the established brand models you have mentioned.

Jan Audio · « **Reply #27 on:** March 16, 2019, 03:59:32 pm »

That is my problem : i checked all the cheaper ones on youtube and i get errors and failures.
btw : the keithley is cheaper then the rigol or siglent.
+ most stuff is also very very big.

edit : I dont want to talk much more about how good the keithley is so the price dont go up.
Now i have to save some money, in maybe 3 month i can buy, it cost 770 euros.

0culus · « **Reply #28 on:** March 16, 2019, 04:13:40 pm »

Quote from: Jan Audio on March 16, 2019, 03:23:41 pm

Quote from: 0culus on March 15, 2019, 02:18:15 am
I like the Keithley 2231A, got it new. It doesn't have quite as many features as the highest model so it was considerably cheaper. It gives you 30V/3A out of channels 1 and 2, 5V/3A out of channel 3. Can connect 1 and 2 in series or parallel to get 60V or 6A, respectively. Easy to save and recall configurations too.

I assume it has current limiting.
Looking good this one, i would go for that one now instead of the R&S.

Yes it does. The current is limited to the number you set, from 0A to the rated output.

ebastler · « **Reply #29 on:** March 16, 2019, 04:22:44 pm »

Quote from: Jan Audio on March 16, 2019, 03:59:32 pm

That is my problem : i checked all the cheaper ones on youtube and i get errors and failures.

Hmm... which "errors and failures" did you see mentioned for the Siglent SPD3303X-E?
(Honest question, since I am pondering buying one myself!)

Quote

btw : the keithley is cheaper then the rigol or siglent. [...]
Now i have to save some money, in maybe 3 month i can buy, it cost 770 euros.

How would 770 Euros for the Keithley be cheaper than 440 Euros (or 370 excl. VAT) for the Siglent?

Jan Audio · « **Reply #30 on:** March 16, 2019, 04:37:11 pm »

You are right, the siglent with the 1milliamp resolution is € 610,00
For 160 more you have a better brand.

Just dont want any more chinese gambling.

0culus · « **Reply #31 on:** March 16, 2019, 04:40:00 pm »

The Keithley branded stuff is manufactured in China, but I have no complaints about the one I have.

Manufacturing in China is highly dependent on how much oversight is given. If you don't give them careful oversight, they can and will find the absolute cheapest way to satisfy your requirements.

ebastler · « **Reply #32 on:** March 16, 2019, 04:42:35 pm »

Quote from: Jan Audio on March 16, 2019, 04:37:11 pm

You are right, the siglent with the 1milliamp resolution is € 610,00
For 160 more you have a better brand.

Just dont want any more chinese gambling.

Your choice, of course. But equating your Peaktech experience with Rigol and Siglent is misleading.

Regarding the pricing: Since I am looking for a power supply for hobby use, I am considering Siglent's -E model with 10mV resolution, with the firm intent of applying the firmware "upgrade" to 1mV.

2N3055 · « **Reply #33 on:** March 16, 2019, 04:43:27 pm »

Those Keithleys are basicaly Itech...
They are not better deal than Siglent .
But whatever you like..

Jan Audio · « **Reply #34 on:** March 16, 2019, 04:50:26 pm »

Quote from: ebastler on March 16, 2019, 04:42:35 pm

Regarding the pricing: Since I am looking for a power supply for hobby use, I am considering Siglent's -E model with 10mV resolution, with the firm intent of applying the firmware "upgrade" to 1mV.

Ah, that changes alot, €440,-

0culus · « **Reply #35 on:** March 16, 2019, 04:50:35 pm »

Either one is probably better than any of the "el cheapo" ones. To get a much higher end *new* power supply costs significantly more than I want to spend as a hobbyist. The EE department at my school has some of the Keithleys for grad students and researchers to use (undergrads have to use cheap ones haha) and they have apparently done well in service. I bought mine on recommendation from the guy who runs their labs.

Jan Audio · « **Reply #36 on:** March 16, 2019, 04:52:07 pm »

Quote from: 2N3055 on March 16, 2019, 04:43:27 pm

Those Keithleys are basicaly Itech...
They are not better deal than Siglent .
But whatever you like..

Hi, what is the exact type-number for this one ?
Do you have a link maybe.
thanks

Jan Audio · « **Reply #37 on:** March 16, 2019, 04:55:21 pm »

Quote from: 0culus on March 16, 2019, 04:50:35 pm

To get a much higher end *new* power supply costs significantly more than I want to spend as a hobbyist.

Indeed, i cant justify the cost exept that i need it.
It is not a oscilloscope with more advanced software, why does it cost so much ?

Jan Audio · « **Reply #38 on:** March 16, 2019, 04:58:14 pm »

The siglent dont have the third channel milliamps limited.

0culus · « **Reply #39 on:** March 16, 2019, 05:05:31 pm »

Quote from: Jan Audio on March 16, 2019, 04:55:21 pm

Quote from: 0culus on March 16, 2019, 04:50:35 pm
To get a much higher end *new* power supply costs significantly more than I want to spend as a hobbyist.

Indeed, i cant justify the cost exept that i need it.
It is not a oscilloscope with more advanced software, why does it cost so much ?

Designing a power supply that won't explode isn't trivial, but clearly it can be done for affordable prices or the siglents/keithleys wouldn't exist. I don't have any experience with a really high end supply, but perhaps they are better calibrated? I don't know. There is a higher Keithley model than mine that has fancier remote control capabilities and costs about twice as much for the trouble. I didn't need those, so the choice was obvious.

Quote from: Jan Audio on March 16, 2019, 04:58:14 pm

The siglent dont have the third channel milliamps limited.

I recommend getting the keithley, then. I got mine through ebay seller valuetronics_international. They are an authorized Keithley/Tektronix distributor as well as used test equipment and they are pretty flexible on price. They accept my best offer every time I've bought from them.

2N3055 · « **Reply #40 on:** March 16, 2019, 05:07:00 pm »

https://www.welectron.com/ITECH-IT6302-Benchtop-Power-Supply
And PSU are more expensive to make because components are just expensive..

0culus · « **Reply #41 on:** March 16, 2019, 05:11:39 pm »

Or get the OEM one, that's fine too. Either way it's a major step up from the cheap shitty ones. I especially hate ones that have knob control that is super jumpy and makes it hard to set.

nctnico · « **Reply #42 on:** March 16, 2019, 05:12:10 pm »

Looking at the Keithley / Tektronix PSU line-up I wonder which ones are designed by Keithley/Tektronix. I'm spotting other rebadges as well from GW Instek.

Jan Audio · « **Reply #43 on:** March 16, 2019, 05:19:06 pm »

If the parts used inside are exactly the same, then i dont mind the brand.
More links are welcome Nico.

509,- i would buy the itech over siglent + hack for 440,-
both chinese.

Just need to be sure about the parts inside.

2N3055 · « **Reply #44 on:** March 16, 2019, 05:42:21 pm »

for +- 30 V 2A and isolated 0-6V 5A you also have DP831 from Rigol...
easy unlock to full res an all functions

bd139 · « **Reply #45 on:** March 16, 2019, 06:32:19 pm »

Or buy some Korads!

2N3055 · « **Reply #46 on:** March 16, 2019, 06:38:39 pm »

Quote from: bd139 on March 16, 2019, 06:32:19 pm

Or buy some Korads!

Despite your sarcasm, not even close...

bd139 · « **Reply #47 on:** March 16, 2019, 06:41:27 pm »

Worth a try

2N3055 · « **Reply #48 on:** March 16, 2019, 06:44:05 pm »

Quote from: bd139 on March 16, 2019, 06:41:27 pm

Worth a try

I wouldn't want it any other way..

Have a good one..

Jan Audio · « **Reply #49 on:** March 17, 2019, 02:17:56 pm »

Looks like the front panel buttons has the feel of a telefunken remote control, not very solid.


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Author Topic: 3 channel PSU without problems (Read 6873 times)

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