R&S
®
CMW 500 Preparing for Use
Putting the Instrument into Operation
Operating Manual 1202.3986.32 – 03 14
1.3.8 Replacing Fuses
The instrument is protected by two fuses (T10 IEC 127-2/V, stock no. 0606.3136.00)
located in the fuse holder to the right of the AC power switch on the rear panel.
DANGER
Shock hazard
For fuse replacement, ensure that the instrument is switched off and disconnected
from the power supply by removing the plug from the AC and DC power connector.
To replace the fuses
1. Open the lid of the AC power connector.
2. Lift the fuse holder out of its slot.
3. Exchange the two fuses.
4. Put the fuse holder back in its slot and close the lid.
1.3.9 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
R&S CMW 500 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 (Timebase OCXO, option R&S
CMW-B690A). 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 R&S CMW 500 is ready for operation. All
modules are power-supplied and the R&S CMW 500 initiates its startup procedure.
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