Concept Of The Hm8040; Output Power; Overtemperatur Protection; Switching The Outputs On/Off - Hameg Instruments HM8040-3 Manuel

Concept of the HM8040-3

The triple power supply HM8040-3 features 3
independent output voltages. In addition to
supplying 3 voltages the 0 ... 20 V outputs may be
connected in series or parallel.
Exceeding 42 V
If all outputs are series connected the sum
can exceed 42 V. In this case touching of
live parts may cause danger of life! It is
assumed that only qualified and ex-
tensively instructed personnel is allowed
to operate these supplies and their loads.
In series connection the maximum current is
0.5 A. By paralleling the outputs a maximum of
1 A is possible. The maximum voltage remains
20 V. Please note that the specifications (e.g.
impedance, noise, regulation) listed for individu-
al use of the outputs may change if series or pa-
rallel connected.

Output power

As the HM8040-3 is fed from the mainframe
supplies in the HM8001-2 its maximum output
power is limited to 25 W. If the HM8040-4 is
operated with HM8003, the output power is
limited to 12 Watt. Sufficient ventilation is
necessary.
The operation of two HM8040-3 in the
HM8001-2 is only permitted if the
sum of all output currents (these are 6)
remains ≤2 A.
STOP
As HM8040-3 is supplied from mainframe
HM8003, the output current per channel
must not exceed 0.25 A.
Overtemperature protection
If the internal temperature exceeds 75 .. 80
degrees C all outputs and displays will be
deactivated. This will be indicated by 3 blinking
dashes in the left and right displays.
As soon as the displays will light up again and
display the values set the instrument will be ready
for operation. In order to turn the outputs back
on the pushbutton OUTPUT
depressed.
I n t r o d u c t i o n t o t h e o p e r a t i o n

Switching the outputs on/off

It is a feature of all HAMEG power supplies that
the outputs can be turned on and off by pushing
a button. The power supply remains turned on
so that all voltages and currents may be set prior
to turning the outputs on.

Introduction to the operation

First time operation
Before turning the instrument on please observe
the following:
– The mains voltage selector at mainframe
HM 8001-2 is set to the correct voltage.
– The correct fuses for the voltage selected are
installed in the fuseholder
– Connection to a mains outlet with protective
earth or to a class 2 isolation transformer
– No visible damage to the instrument
– No damage to the line cord
– No loose parts inside the instrument
Turning the instrument on
After turning the instrument on the outputs will
always remain disconnected in order to protect
the loads. First the desired voltages should be
set , then the desired maximum currents, then
the outputs may be activated by pressing OUT-
PUT
the current limit mode (electronic fuse deac-
tivated). If the fuse mode is selected after turn-
on this mode will be lost after turn-off.
has to be
. After turn-on the instrument will select
Subject to change without notice
25