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SML                                                                                      RF Frequency


4            Instrument Functions

This chapter describes the functions of the instrument and its options which can be activated manually
via menus or by remote control (frequency and level settings, analog modulations, sweep, and general
functions not directly related to signal generation).



RF Frequency

The RF frequency can be set directly using the [FREQ] key or via the Frequency menu. In the
Frequency menu, the frequency of the RF output signal is entered and indicated under Frequency.

In frequency settings made with the [FREQ] key, an arithmetic offset is taken into account. Such
settings are indicated in the header line of the display. This makes it possible to enter the desired output
frequency of subsequent units, if any (eg mixers). The offset can also be entered in the Frequency
menu (see next section: "Frequency Offset").

Note:        Further settings:          Frequency sweep                  Sweep menu
                                        LF frequency                     Modulation menu
                                                                         LFOutput menu
                                        Int./ext. reference frequency    Utilities - Ref Osc menu



Menu selection: Frequency




Fig. 4-1     Frequency menu

Frequency               Input value of RF frequency at RF output connector.
                        IEC/IEEE-bus command        :SOUR:FREQ 100E6

Offset                  Input value of frequency offset, for example of subsequent mixer.
                        IEC/IEEE-bus command         :SOUR:FREQ:OFFS 0

Knob Step User          Input value of step size of frequency variation via rotary knob. The RF frequency
                        is varied by the entered step size if Knob Step is set to User.
                        IEC/IEEE-bus command           :SOUR:FREQ:STEP 1MHz




1090.3123.12                                        4.1                                                 E-3
RF Frequency                                                                                         SML

Knob Step                Decimal    The variation step size corresponds to the position of the digit cursor.
                         User       User-defined, the variation step size is as entered under Knob Step
                                    User.

Exclude from Recall Off             Normal setting. The stored frequency is loaded too when instrument
                                    settings are loaded with the [RCL] key.
                                    IEC/IEEE-bus command           :SOUR:FREQ:RCL INCL
                         On         The stored frequency is not loaded when instrument settings are
                                    loaded, ie the current frequency setting is maintained.
                                    IEC/IEEE-bus command           :SOUR:FREQ:RCL EXCL


Frequency Offset
On the SML it is possible to enter an offset for subsequent units, if any, in the Frequency menu. Such
entries are taken into account in the frequency displayed in the header line, which indicates the
frequency of the RF signal at the output of the units in question (see Fig. 4-2).
The frequency of the RF output signal in the Frequency menu is calculated from the frequency displayed
in the header line and offset values as follows:
                     RF output frequency = frequency displayed in header line 

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