R&S ZVB Instrument Construction and Function Description
1145.1078.82 3.19 E-4
Power supply
The power supply produces all the voltages required to power the R&S ZVB. It can be turned off with a
switch on the instrument’s rear panel.
The power supply is a primary-switched power supply with power factor correction (PFC) and standby
circuit (+12 V standby).
On the secondary side, it outputs DC voltages (+3.4 V, +5.2 V, +6.5 V, +8.25 V, +12.25 V, +12 V
standby, -12.25 V).
The control signal RS_PS_ON which is controlled by the front module controller (via the STANDBY/ON
key at the front of the instrument frame), activates the power supply. In the standby mode, the power
supply generates only the 12-V standby voltage to supply a crystal oven and the STANDBY status
display on the front panel.
The secondary voltages are open-proof and short-proof to ground and mutually open-proof and short-
proof.
A circuit that prevents overheating is also provided. Overheating is indicated to the front module
controller via a status signal (OT).
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