34
Subject to change without notice
7 Extended operating modes
7.1 Compensation of the voltage drop across the
cables
(using the sense input)
Fig. 7.1: Compensation of the voltage drop across the cables
(drawing)
Use two additional cables from the load to the sense inputs
(outer black terminals of the channel terminals) to compensate
for the voltage drops across the ouput cables.
7.2 Parallel and series connection of
power supplies
These power supplies and their loads may only be
operated by such personnel that has the necessary
expertise and training!
Power supplies resp.the channels thereof must only operated in
series or parallel connection if they are expressly destined for
such operation; this is the case for all HAMEG power supplies.
Series resp. parallel connection increases the voltage resp. the
current; these connections are, as a rule, possible, because
power supply outputs are fl oating.
Series operation
Fig. 7.2: Series operation
The voltages of the outputs add up, the current is the same in
all ouputs. The current limits of the outputs in the circuit should
be set to the same level. If one output enters current limiting
the total voltage will start to drop.
A series connection may raise the total voltage to a
level beyond the safe low voltage level.
Parallel operation
Fig. 7.3: Parallel operation
In order to increase the total output current the outputs are
connected in parallel. It is important to set the individual output
voltages as close as possible to the same value. Even minute
voltage differences are suffi cient to cause one output to enter
current limiting as it tries to deliver all the current; the output
voltage will, however, remain constant, until the last output en-
ters current limiting. In general, with such a parallel connection,
currents may fl ow out of and into outputs; power supplies of other
make may be destroyed if they are not protected against overload
by unequal current distribution.
This one possibility of programming this example; of course, it
is also possible to write the commands in full:
INSTrument:SELect OUT1
SOURce:VOLTage:LEVel:IMMediate:AMPLitude 2
SOURce:CURRent:LEVel:IMMediate:AMPLitude 0.5
OUTPut:STATe ON
Example 2: Reading of the actual settings of current and
voltage
INST OUT1
MEAS:CURR?
MEAS:VOLT?
Example 3: Programming and outputting of a 3-step Arbitrary
sequence
The following programming example generates an Arbitrary
sequence which starts at 1 V and 1 A for 1 sec and which is in-
cremented each second by 1 V and 1 A. Then this sequence will
be transfered to CH2 and started.
ARB:DATA 1,1,1,2,2,1,3,3,1
ARB:TRAN 2
ARB:STARt 2
INST OUT2
OUTP ON
Example 4: FuseLinking
The following example links the fuse of CH1 to the fuse of
CH3.
INST OUT1
FUSE ON
FUSE:LINK 3
CH1
64 V
5 A
32 V
5 A
32 V
5 A
CH2 CH3 CH4
32 V
10 A
CH1
32 V
5 A
32 V
5 A
CH2 CH3 CH4
Extended operating modes
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