Applications
R&S
®
NGA100
110
User Manual 5601.8919.02 ─ 03
8
Applications
8.1
Parallel and Series Mode
It is assumed that only qualified and trained personnel service the power supplies and
the connected loads.
Use only the R&S NGA100 power supply series when operating the channels in a ser-
ies or parallel mode to increase the output voltage and current.
Series connection
A series connection may cause dangerous voltages.
To increase output voltage and currents, it is possible to operate the channels in series
or parallel mode. In general, the output voltages of R&S NGA100 to be combined are
independent.
8.1.1
Series Mode
This type of interconnection adds the individual output voltages. The same current
flows through all outputs. The current limits for the outputs wired in series should be
set to the identical value. If one of the outputs exceeded the current limit, the total volt-
age will naturally collapse. See
Chapter 5.5, "Operation Modes"
It is advisable to set the voltages of all connected channels voltages to a similar value
to distribute the loads evenly (not absolutely necessary). When both channels are con-
nected in a series mode and if a (low resistance) load is connected; there is a chance
of damaging a channel when that channel is switch off. This is due to the protection
diode working as a bypass to connect the other channel in a series mode. Once the
protection diode is shorted, the channel will be defective.
Therefore, it is necessary to always have all channels or no channel at all switched on.
If the instrument switches to constant current output mode (CC) during a series con-
nection, the voltage display becomes inaccurate.
Parallel and Series Mode