Chapter 2 Design and Function
5300.9677.72 - 2.23 - EN-4
2.1.2 Power Supply Fault (R&S SR8010)
The transmitter includes a power supply unit. The exciter board and mainboard are supplied
with power through a DC/DC converter with current-limited output. All lines carrying AC
supply voltage and high current are covered to prevent touching (double insulation,
sheathed conductor + shrink-on sleeve).
If primary-side components fail, the integrated primary fuses respond in the power supply
unit. Transfer of primary-side overcurrent to the secondary side is prevented by potential
isolation from the power supply. The power supply to the exciter board and mainboard is
protected by a fuse input side (at the DC/DC converter) and has an output current limiter.
In view of the power required from the current supply, the current available at the output of
the power supply unit can be as high as 16 A.
2.1.3 Power Supply Fault (R&S SR8025/SR8050/SR8100)
The transmitter has two power supply units. The exciter board and the mainboard are sup-
plied with power from an auxiliary power supply unit with current-limited output. All lines car-
rying AC supply voltage and high current are covered to prevent accidental contact (double
insulation, sheathed conductor + shrink-on sleeve).
If primary-side components fail, the integrated primary fuses respond in the line filter. Trans-
fer of primary-side overcurrent to the secondary side is prevented by potential isolation of
the power supply unit. The supply of power to the exciter board and mainboard is safe-
guarded by means of the output-current limitation of the auxiliary power supply unit.
To meet the power supply requirements, currents of up to 10 A are available at the output
of the auxiliary power supply unit and currents of up to 70 A are available at the output of
the amplifier power supply unit.
Fault Protection mechanism Function
Damage between line filters
and power supply unit
Protected by primary fuses Primary fuse trips.
Damage to power supply
unit
Protected by primary fuses Primary fuse trips.
Damage between power
supply unit and amplifier
board
Current limitation of power supply unit Current limited
Damage to DC/DC con-
verter
Protected by fuse on amplifier board Fuse trips.
Overload via exciter board/
mainboard
Current limitation of DC/DC converter Current limited
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