Here is the manual for the dual channel version, marked up with corrections and warnings about bugs in the user interface and behavior:
https://ufile.io/drsjx09jThis applies to models:
- TENMA 72-10495 (Korad KA3005D-2S): 30V-5A x 2 Channels
- TENMA 72-10500 (Korad KA3003D-2S): 30V-3A x 2 Channels
and probably also
- TENMA 72-10505 (Korad KA3003D-3S): 30V-3A x 2 Channels & 5V-3A x 1
Important notes to avoid damage:
● Do not allow power supply to sink current. Use diode when charging battery.
● For sensitive circuits, see Avoiding overshoot and excessive in-rush current :
○ Inside the power supply, there is a capacitor near the output terminals for stability. The current limiting and over current
protection (OCP) cannot control current from this capacitor.
○ There is some overshoot on turning a channel on.
○ There is a spike when turning mains off while the channel is on.
● In parallel mode, connect load to CH2 (right hand) channel. (When mains power is turned on, the power supply defaults to
independent mode, and CH1 to whatever voltage and current settings are in CH1 memory recall M1, with the load turned off.
Therefore, avoiding CH1 could prevent mistakenly applying wrong settings to the load.)
● OCP and OVP do not work in serial and parallel modes.
● If you recall a CH2 memory in SER mode, only CH2 is updated from that memory and only CH2 turns off. At this time, CH2
output terminals have up to -1.2 V (i.e. reverse polarity) on them, with a short circuit current of up to -2.8 A.
This also happens when the channels are independent but you have wired them in series.
● When using the power supply in SER mode, or wired in series, you may have to ensure the supply is working in CV mode to
avoid instability.
Important notes to avoid confusion:
● There is a small negative voltage and current when the load is switched off (50mV, 100 uA)
● OCP/OVP:
○ CH2 OUT LED stays on after CH2 OCP/OVP trip disconnects the load.
○ OCP and OVP do not work in serial and parallel modes
○ CH2 OVP/OCP buttons also control CH1 OVP/OCP
○ CH1 OVP/OCP buttons only control CH1 OVP/OCP
○ The OCP and OVP LEDs apply to whichever channel last updated them. Pressing either the OVP or OCP button updates both the
OVP and OCP LEDs with that single button push.
● An OCP/OVP trip for one channel does not trip the other channel