We're evaluating the KWR102 for a colleague/client that requires a max ~25A capability at ~12VDC for production product testing. Because funds are short we had to consider a lower tier Power Supply for their use as well as ours (we are developing custom controllers for their future products).
After reading the various reviews and user experiences we decided to give Korad a try and purchased a KWR102 which may meet the needs for output levels and as a Bench Supply for the controller development, but should at least be acceptable for the production testing.
Initial impression after Dave's famous "Take it apart!!" addiction (which we were also born with), as this supply is well built considering the price/performance ratio, you can probably gather that from the earlier image posts by WR3 & knudch. Korad also provides nice flexible #10AWG long test leads with spade lugs, USB and RS232 NULL cables, and a detailed test verification sheet with equipment utilized (Fluke 8846A, ITECH IT8512, Rigol MSO5204), date and a real signature
We did a few measurements to check things out and the supply can provide the stated current levels at the voltage levels shown within the 300W power constraints. The voltage noise levels are remarkably low, well below the specs, and don't jump up much as output current increases, altho we did discover some random low frequency jumping around when the fan(s) engage. The fans are loud at full force with some case "buzzing" occuring but acceptable (no buzzing) at low levels and the units seems to have a very long time constant (minutes) that cycles the fans even without a load sometimes.
The output voltage levels were spot on across the entire range with a quick unloaded measurement, and we mean spot on as 10V is 10.000058V (40uv SD), 1V is 1.00010V (8uV), 20V is 20.00036V (13uV), these will wander some as temp changes with fans and the SD gets much higher above 20V, >100uV. We didn't measure current levels in detail other than checking the high end limits, but the readings seemed to agree well with the electronic load (SDL1020X). A quick check of the load regulation at the PS terminals is very good, we haven't tried the remote sense capability yet tho.
The provided manual is not thorough and requires some time to work thru even tho it's short. The files provide on the CD evidently are not shown on the Korad website, and we have no means to read a CD! We haven't been able to get the Slope and Dynamic Setting Functions to work.
Remote control by USB or RS232 (haven't tried LAN) doesn't work with VISA but does with a Terminal like TeraTerm. The commands shown in the manual can be truncated by removing the ID portion, as example manual shows VSET05:12.5 which can also be VSET:12.5.
Anyway, this KWR102 seems like a good supply, well built & small, excellent performance and good value considering the performance/price/specs. Hopefully someone has been able to get the Slope and Dynamic Setting Function to work, and can report such.
Edit: We were able to get the Slope and Dynamic Setting Functions to work, this was by entering the details from Remote rather than Front Panel. VSLOPE and ISLOPE work as expected with V or I per 100us slope, and the Dynamic LIST command with 00 entered the number of loop cycles and the number of individual Voltage, Current, Slope (V/100us), and Time between updates. Then the LIST command with 01, 02,03 and so on enters the previous mentioned parameters for each update point.
Best,