  # Philips PM2831 Power Supply User Manual Usin
g
g
rammable Power Supply 5 - 15
Example for a variable load resistance:
Required: The V
set
and I
set
parameter have been coupled for the selected
output channel.
•I
Set
= 1A Pro
g
rammed current becomes 1A.
•V
set
= 8V Pro
g
rammed volta
g
e becomes 8V.
•If R
increases from 8 to 16Ω, then R
> R
c
, so the output channel
g
oes
into the CV mode (refer to fi
g
ure 5.5.7). This means that V
= 8V and
I
becomes 8V/16 = 0.5A.
•If R
decreases from 8 to 4Ω, then R
< R
c
, so the output channel
g
oes
into the CC mode (refer to fi
g
ure 5.5.7). This means that I
= 1A and V
becomes 1A x 4 = 4V.
Example for a fixed load resistance:
Required: - Fixed load resistance R
= 10.
- Overcurrent protection disabled (OCP DIS).
- The V
set
and I
set
parameter have not been coupled.
power
output
+
-
+
-
V
set
OVP
set
I
set
V
set
= Volta
g
e pro
g
rammed
I
set
= Current pro
g
rammed
R
= 2 to 20 (variable)
The crossover point resistance R
c
= V
set
/ I
set
= 8.
power
output
+
-
+
-
V
set
OVP
set
I
set
V
set
= Volta
g
e pro
g
rammed
OVP
set
= OverVolta
g
e pro
g
rammed
I
set
= Current pro
g
rammed