Controls And Displays - Rohde & Schwarz Hameg Instruments HM8040-3 Manual

C o n t r o l s a n d d i s p l a y s
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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 bet-
ween "current limiting" and "electronic fuse"
V / mA / F (4 x LED)
V
The voltage at the safety terminals is dis-
played with a resolution of 0.1 V
mA
The output current is displayed with a reso-
lution 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 current
limit mode. The knobs CURRENT
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
24
Subject to change without notice
2 3
9 10
allow to
without af-
max
4 5 6
11 12
fecting 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 operation. In order to set a current limit the
max
output concerned has to be shorted fi rst, then the
limit adjusted which is indicated by the associated
LED or lighting up. After removal of the short
the LED will extinguish.
Electronic fuse
Before selecting this mode the maximum cur-
rents of the 2 outputs have to be set according
to the procedure outlined above. The pushbutton
V/mA/Fuse
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
current will continue to fl ow there. If the current
limit is reached in the right output, however, all
outputs will be turned off.
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13 14
has to be pushed long. After the
is reached in the left output
max