R&S FSQ Signal Analyzer - Rohde & Schwarz

R&S FSQ Instrument Functions
FREQUENCY
OFFSET
MODULATION
4.7.5 Frequency-Converting Measurements
Tracking Generator – Option R&S FSU-B9
For frequency-converting measurements (e.g. on converter units) the tracking generator
is able to set a constant frequency offset between the output frequency of the
tracking generator and the receive frequency of the R&S FSQ.
Up to an output frequency of 200 MHz the measurement can be carried out in both
inverted and normal positions.
Fig. 4.26 Test setup for frequency converting measurements
The FREQUENCY OFFSET softkey activates the input of the frequency offset
between the output signal of the tracking generator and the input frequency of the
R&S FSQ. Possible offsets are in a range of ±200 MHz in 0.1 Hz steps.
The default setting is 0 Hz. Offsets 0 Hz are marked with the enhancement label
FRQ.
If a positive frequency offset is entered, the tracking generator generates an output
signal above the receive frequency of the R&S FSQ. In case of a negative frequency
offset it generates a signal below the receive frequency of the R&S FSQ. The output
frequency of the tracking generator is calculated as follows:
Tracking generator frequency = receive frequency + frequency offset.
Remote command: SOUR:FREQ:OFFS 50MHz
4.7.6 External Modulation of the Tracking Generator
EXT AM
EXT FM
EXT I/Q
MODULATION OFF
The MODULATION softkey opens a submenu for selecting different modulation
modes.
The time characteristics of the tracking generator output signal can be influenced by
means of external signals (input voltage range -1 V to +1 V).
Operating Manual 1313.9681.12 - 01 4.231