Hameg HM8040-3, Руководство пользователя

Страница: 25 / 28

Subject to change without notice
25
The current limits can be adjusted using
the rotary controls CURRENT bet-
ween 0 – 500 mA. In the CCW position
of these controls 0 A the current will be
indeed zero, so the output capacitances
will be discharged slowly to 0 Volt.
In the “current limit“ mode the appro-
priate LED (I
max
) will light in the
CCW position and as explained the output
voltage will slowly decrease to zero. In
the “electronic fuse“ mode all outputs
will be disabled immediately after pres-
sing OUTPUT if any of the CURRENT
controls is set CCW.
Displays
7segment 3 digit displays of either voltage
or current. Each display associates with the
terminals underneath. The displays show
continuously the voltages resp. currents of
the two 20 V outputs, also while these are
switched off. This allows presetting the out-
put levels prior to activating them which we do
recommend. Selection of voltage or current is
done using the pushbuttons V/mA/Fuse .
The voltages are displayed with a resolution
of 0.1 V, the currents with 1 mA.
Output
Pushbutton for turning all outputs ON/OFF.
The displays remain unaffected always on.
Activation of the outputs is indicated by the
LED “ON“.
0 .. 20 V
Outputs 0 .. 20 V. Safety terminals for 4 mm
safety plugs. The outputs can withstand shorts
of unlimited duration.
Voltage
Knobs for output voltage adjustment
Current
Knobs for maximum output current adjust-
ment, pertinent only for the 20 V outputs. The
range is 0 .. 500 mA.
If the control is fully CCW the outputs will be
disabled immediately if the mode “electronic
fuse“ was selected. In “current limit“ mode
the LED I
max
will light up, and the voltage will
decrease slowly to 0 Volt.
C o n t r o l s a n d d i s p l a y s
5 V/1 A
5 V output with safety terminals for 4 mm
safety plugs. Short-circuit proof. The voltage
may be changed from 4.5 V to 5.5 V using a
screwdriver.
Overtemperature protection!
If the internal temperature exceeds
75 .. 80 degrees C the outputs and the
displays will be switched off which is
indicated by 3 blinking dashes showing
in the left and right displays. As soon as
the displays light up and show the values
set again the instrument is ready for
operation. In order to turn the outputs
back on the pushbutton OUTPUT has
to be depressed.