Chapter 2 Design and Function
5300.9677.72 - 2.22 - EN-4
MPX baseband signal
RF output signal
Forward power/reflected power of standalone instrument
Forward power/reflected power of combined instrument
Miscellaneous amplifier parameters
Fan function
2.1 Protection of Electrical System
The following section describes the faults that can occur in the electrical system of the
transmitter and how the electrical system is protected against these faults.
2.1.1 Power Failure
R&S SR8010: The transmitter has a single phase main power supply for the output stage,
exciter board, and mainboard modules.
R&S SR8025/SR8050/SR8100: The transmitter has a single phase main power supply for
the output stage module, together with a single phase auxiliary power supply for the exciter
board and mainboard modules.
R&S SR8130: The transmitter has two single phase main power supplies for the output
stage module, together with a single phase auxiliary power supply for the exciter board and
mainboard modules.
R&S VU813: The instrument has two single phase main power supplies for the output stage
module, together with a single phase auxiliary power supply for the instrument controller.
In the event of a power failure, a distinction is made between a short interruption of less
than 0.3 s and a long interruption exceeding 0.3 s.
The system is always shut down in the event of long power failures. The exciter is then re-
booted and the transmitter is gradually returned to its pre-shutdown state.
The following scenario applies to short power failures:
– Message on power supply control
Note The transmitter always returns to the operating mode that it was in prior to the interruption
(automatic restart without manual acknowledgment).
Fault Protection mechanism Function
Power failure <0.3 s No reaction No reaction
Power failure >0.3 Undervoltage trips power
supply
Shutdown of exciter and amplifier until
power is restored
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