I've had my Siglent SPD3303D for a 1/2 dozen years now (Software version: 1.01.01.01.06, Hardware version: V1.1) and I got the shock of my life the other day. I went to grab my channel probes on channel 1, with channel 1 set to 7 VDC and the current limited to something around 700 mA. I inadvertently grabbed the probe metal and got what I believed was a live power shock! I couldn't believe it, because the channel was not set to on, but I got an almighty shock.
I immediately pulled out my multimeter and I was doubly shocked to see that my channel one terminals were reading 20 VDC, without being powered on. It now doesn't matter what i set Channel 1 to, regarding voltage or current...the channel one terminals always present 20 vdc and they show "CC" continuously, as soon as the channel is turned on.
I have searched around for anyone else having trouble with their 3303D, but haven't found anyone online with a similar problem. I have measured voltage on both Channel 1, Channel 2 and Channel 3, even when the whole scope is powered on, but there are no channels activated.....is this a "normal" condition for this power supply? I am shocked (no pun intended) to find any voltage present on the channel terminals, when the channel is deactivated...am I missing something?
Thx, Jim
ps. there are no warning dialogs/messages anywhere, or any fault messages posted/warned about, but the fact that the channel is showing CC when the channel is active but the channel probes are disconnected, tells me there is something seriously wrong...