Products > Test Equipment
Why so expensive? BK Precision 1743B Power Supply
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ebastler:

--- Quote from: AVGresponding on December 28, 2022, 11:40:19 am ---Could you make some ripple and noise measurements at full power for us?

--- End quote ---

Here's an older review with measurements and some modification suggestions. (The temperature-controllled fans are already standard in the more recent versions of the KA3005x.) http://afug-info.de/Testberichte/Korad-RND-3005P/

German only, unfortunately. Ripple is "Restwelligkeit". 2 mVpp is what they measured, apparently met over the full range of voltages and currents.
bdunham7:

--- Quote from: Omega Glory on December 26, 2022, 04:26:23 am ---I recently acquired a used BK Precision 1743B Power Supply on Ebay for about $125. It's a 0-35V 0-6A single output power supply. After checking BK's website, I discovered that this unit is priced at $690 new, and includes a 2 year warranty. I was shocked to see this price, and I'm wondering why it happens to be so very expensive. For example, for about $145, one can get a KORAD KA3005P, which has similar voltage and current capabilities, and more sophisticated controls, (it also comes with a 2 year warranty).

So what's going on here? Are you paying an extra $545 for the name brand and build quality? Or perhaps its something more subtle, like voltage ripple.

Any thoughts?

--- End quote ---

Your first clue would be the weight.  The BK unit probably weighs 25-30 lbs, not sure for the other one but I'll bet it's nowhere near that.   The transformer will be 3X or more the size of the Korad unit.  But the most important difference is that the BK will have full overload  and reverse polarity protection and is suitable for battery charging.  You can connect a battery to it while it is powered off without damage.  And if you are careless, you can connect that battery backwards and still not damage it.  If I were  you I'd be very happy to have that unit at that price.
jeffjmr:
I have two 1743s. They have been bulletproof.

I believe the A and B models added an internal shorting switch for setting current without having to short the leads.

One of mine is noisy, one quiet but neither as quiet as my Leader LPS-152.

Here’s the schematic for the 1743.

Jeff
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