R&S
®
ZVB Putting the Instrument into Operation
1145.1055.62 1.13 E-2
To turn the power on or off, press the AC power switch to position I (On) or 0 (Off).
After power-on, the analyzer is in standby or ready state, depending on the state of the STANDBY
toggle switch at the front panel of the instrument when the instrument was switched off for the last time.
The AC power switch can be permanently on. Switching off is required only if the instrument
must be completely removed from the AC power supply.
Standby and Ready State
The STANDBY toggle switch is located in the bottom left corner of the front panel.
After switching on the AC power, press the STANDBY key briefly to switch the analyzer from the
standby to ready state or vice versa.
• In standby state, the right, amber LED is on. The standby power only supplies the power switch
circuits and the optional oven quartz (OCXO, 10 MHz reference oscillator, option ZVAB-B4, stock
no. 1164.1757.02). In this state it is safe to switch off the AC power and disconnect the instrument
from the power supply.
• In ready state, the left, green LED is on. The analyzer is ready for operation. All modules are
power-supplied and the analyzer initiates its startup procedure.
Attention!
The instrument is still power-supplied while it is in standby mode.
Replacing Fuses
The DC inputs PORT BIAS at the rear panel are protected by four fuses IEC 127 - F 250 L
(250 mA flink).
To replace the fuses open the fuse holder by slightly turning the lid counterclockwise.
Replacement fuses are provided with the instrument.
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