Rigol DP832 Question (analog/digital power from same PSU)

[staze]

All,

Thinking about picking on of these Rigol DP832 up, and have a question. Since channel 2 and 3 share a common connection, it seems like the DP832 would not be able to be used to power both the analog and digital side of board in that, I couldn't track with channel 1/2 ±15V, then give 5V to the digital side of things with channel 3, correct? I'd have to run channel 3 to a 5V regulator with, at the lowest, 10V?

Basically, could I get away with having just one bench power supply. =P

Thanks!

[MarcelM]

You can, assuming that you use output 1 for the negative supply, and output 2 for the positive.
Connect the plus side of output 1 to the shared ground of output 2 and 3.
Then you'll end up with -15V, +15V and +5V, which is what I assume you're looking for.

Rgds,
Marcel

[staze]

You can, assuming that you use output 1 for the negative supply, and output 2 for the positive.
Connect the plus side of output 1 to the shared ground of output 2 and 3.
Then you'll end up with -15V, +15V and +5V, which is what I assume you're looking for.

Rgds,
Marcel

Okay... weird. I thought for some reason output 3 could only be at most, 5V different than output two, since they share a ground. So then theoretically, I could also do -30V, +30V, and +5V?

[MarcelM]

So then theoretically, I could also do -30V, +30V, and +5V?

Not just theoretically, you can even do that in practice 

You could also do +60V and +5V, or +30V@6A and +5V

Useful little power supply....

Marcel

[staze]

So then theoretically, I could also do -30V, +30V, and +5V?

Not just theoretically, you can even do that in practice 

You could also do +60V and +5V, or +30V@6A and +5V

Useful little power supply....

Marcel

Okay then. =) So, what problems do you actually face with regards to the shared common for Channels 2 and 3?

[MarcelM]

Okay then. =) So, what problems do you actually face with regards to the shared common for Channels 2 and 3?

The only issue I can think of, is the way Rigol does current sensing in the (shared) ground connection. EEVBLOG's Dave did a video on this. Best solution is to have a solid ground connection between the ground terminals of output 2 and output 3.

Other than that, the power supply has been performing nicely for me...

Regards,
Marcel

[TomThomas]

You can, assuming that you use output 1 for the negative supply, and output 2 for the positive.
Connect the plus side of output 1 to the shared ground of output 2 and 3.
Then you'll end up with -15V, +15V and +5V, which is what I assume you're looking for.

Rgds,
Marcel

Okay... weird. I thought for some reason output 3 could only be at most, 5V different than output two, since they share a ground. So then theoretically, I could also do -30V, +30V, and +5V?

Hi,
if you Need +30 V and  -30V and +5V, why you don't go directly for a DP831??
br Tom