Putting into Operation R&S SMR
1134.9108.12 E-1 1.2
Supply Voltage
The SMR can be operated at a.c. systems from 100 to 120 V and 200 to 240 V at system frequencies
from 50 to 60 Hz. The power supply socket is situated at the rear of the instrument. The instrument
automatically sets itself to the voltage applied within the permissible voltage ranges. It is not necessary
to set the instrument to a certain supply voltage.
How to Ensure EMC
In order to avoid electromagnetic interference, the instrument may only be operated when it is closed
and with all shielding covers fitted. Only appropriate shielded signal and control cables may be used.
Power Fuses
The SMR is protected against short circuits by means of two fuses according to nameplate of the power
supply. The fuses are situated in the draw-out fuse holder which is inserted close to the power supply
socket (see below).
Power supply socket
Fuse holder
Power supply socket at the rear of the instrument
Switching On/Off the Instrument
O
I
Switch on: Press switch.
The instrument is ready for operation.
Switch off: Release switch.
On/Off switch at the front of the instrument
Initial Status
Upon switching on, the instrument automatically assumes the status which was set when it was
switched off.
If the instrument need not to be operated from the initial status any further, a defined default status
should be established by pressing the [PRESET] key prior to further settings.
Frequency accuracy after switching on when the oven-controlled reference oscillator is fitted
(option SMR-B1)
The reference oscillator needs some minutes of warm-up time to reach its nominal frequency. During
this period of time, the output frequency does not yet reach its final value either. In the status line in the
header field of the display the message "OVEN COLD" is displayed for this time.
RAM With Battery Back-Up
The SMR has a static read-write memory (CMOS-RAM) with battery back-up, in which 50 different
complete settings of the instrument can be stored (cf. Chapter 3, section "Storing and Calling of
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