Instrument Function
R&S
®
SMB100A
116Operating Manual 1407.0806.32 ─ 13
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an internal pulse generator
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the external modulation inputs MOD EXT and PULSE EXT.
An external trigger signal for the the sweeps and the LIST mode can be provided at the
INST TRIG input.
The input REF IN is used to input an external instrument reference, and the output REF
OUT serves as the output of the reference frequency (internal or external).
5.3.2 RF Frequency
The value of the RF frequency is displayed in the header of the instrument's display
("Freq"). This field provides the direct input of the RF frequency. Alternatively, you can
enter the RF frequency in the "Frequency/Phase" dialog.
Be aware that the displayed RF frequency in the header, and the RF output frequency,
entered in the "Frequency/Phase" dialog can be different, as explained in the following
section.
5.3.2.1 RF Frequency vs. RF Output Frequency
The signal generator offers the possibility, to take additional frequency modifications of
a downstream instrument into consideration, such as an offset set by a mixer, or a multiple
of the frequency by a frequency multiplier. The R&S SMB indicates the resulting fre-
quency, including offset and multiplication factor in the header of the screen. I.e. the
indicated frequency corresponds to the frequency at the output of the downstream instru-
ment. However, the frequency at the RF output of your signal generator always corre-
sponds to the frequency set in the "Frequency/Phase" dialog.
In this dialog, you can also enter the values of the downstream instrument.
A set frequency offset is indicated by the "FREQ OFFSET" status message.
The correlation between the RF frequency, the RF output frequency and the frequency
offset is as follows:
"Freq" (in header) = "RF output frequency" (Frequency in dialog) * "Multiplier" factor
(Multiplier in dialog) + "Freq offset" (Offset in dialog)
RF Block
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