48V.

[Moro79]

Hi guys
Plz who can help me to know the difference between +48V and - 48V input power supply for instruments.

 

[Martaine2005]

48V is usually known as phantom power. Found on audio mixers and professional mixing desks.

But the difference you ask :
One is positive and the other is negative.
Can you elaborate on your question?

Martin

 

[(*steve*)]

Technically, the difference is 96 volts.

 

[bertus]

Hello,

The +48 Volts is 48 volts positive related to ground potential.
The -48 Volts is 48 Volts negative related to ground potential.

Bertus

 

[Harald Kapp]

And then sometimes you will find a power supply input labeled "48 V" with a "+" on one input and a "-" on the second input. In this case the voltage is 48 V and the indicators are there to show you the correct polarity.
As @Martaine2005 asked: please be more specific, show us photos of the input in question, if possible.