Preparing the Analyzer for Use
R&S
®
ZVA
21
Quick Start Guide 1145.1090.62 ─ 10
1.3.8 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 (see
chapter 1.3.7, "Power on and off"
on page 20) 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 oscil-
lator, option R&S ZVAB-B4, order 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.
Shock hazard
The instrument is still power-supplied while it is in standby mode.
1.3.9 Replacing Fuses
The DC inputs PORT BIAS at the rear panel are each protected by a fuse IEC 127 - F
250 L (250 mA quick acting).
► To replace the fuses open the fuse holder by slightly turning the lid counterclockwise.
Replacement fuses are provided with the instrument.
1.4 Starting the Analyzer and Shutting Down
To start the analyzer, proceed as follows:
1. Make sure that the instrument is connected to the AC power supply and the power
switch on the rear panel is in position I (On).
2. If necessary, press the STANDBY toggle switch on the front panel to switch the
instrument to ready state (the green LED is on).
In ready state, the analyzer automatically performs a system check, boots the Win-
dows
®
XP operating system and then starts the network analyzer (NWA) application. If
the last analyzer session was terminated regularly, the NWA application uses the last
setup with all instrument settings.
Starting the Analyzer and Shutting Down
