User manual

26
Subject to change without notice
Controls and displays
V / mA / Fuse
a) Short operation: switches displays back and
forth between voltage (V) and current (mA)
b) Long operation: switches back and forth
between “current limiting“ and “electronic
fuse“
V / mA / F (4 x LED)
V
The voltage at the safety terminals is
displayed with a resolution of 0.1 V
mA
The output current is displayed with a
resolution of 1 mA
F
If the electronic fuse was activated this LED
will light up.
I
max
If current limit is reached, the lower LED
lights up.
Current limiting
After turn-on the instrument will be in the cur-
rent limit mode. The knobs CURRENT allow
to set the maximum output currents for the left
and right 20 V outputs independently of each
other. If the current limit in one output is reached
the current will remain at the value I
max
without
affecting any other output. If the current limit set
of the remaining output should be reached, this
output will also change over to constant current
I
max
operation. In order to set a current limit the
output concerned has to be shorted first, then
the limit adjusted which is indicated by the
associated LED or lighting up. After rem-
oval of the short the LED will extinguish.
Electronic fuse
Before selecting this mode the maximum currents
of the 2 outputs have to be set according to the
procedure outlined above. The pushbutton V/mA/
Fuse has to be pushed long. After the LED
“F“ lights up the electronic fuse mode is
active. If any of the current limits set is reached all
outputs will be turned off completely. In order to
leave the electronic fuse mode press the push-
button long again.
Example:
The left output may be in the “current limit“ mode
while the right output may be in the “electronic
fuse mode“. If I
max
is reached in the left output
current will continue to flow there. If the current
limit is reached in the right output, however, all
outputs will be turned off.
–––
+++
0 – 20 V
0.5 A
1 A
0.5 A
0 – 20 V
5 V
VOLTAGE CURRENT VOLTAGE CURRENT
V
OUTPUT
TRIPLE POWER SUPPLY HM8040-3
Instruments
FF
ON
PUSH LONG
FUSE
ON/OFF
mA
V
FUSE
ON/OFF
mA
8
1 2 3 4 5 6 7
9 10 11 12 13 14
Controls and displays