R&S FSQ Signal Analyzer - Rohde & Schwarz

R&S FSQ Instrument Functions
FREQUENCY
OFFSET
Table 4-8 Measurement accuracy levels
Accuracy Enhancement
label
4.8.5 Frequency-Converting Measurements
External Generator Control – Option R&S FSP-B10
Reason/Limitation
High NOR No difference between reference setting and measurement
Medium APX
(approximation)
- Aborted
normalization
For frequency-converting measurements (e.g. on converters) the external generator
is able to set a constant frequency offset between the output frequency of the generator
and the receive frequency of the R&S FSQ and, in addition, the generator frequency
as a multiple of the R&S FSQ.
Fig. 4.35 Test setup for frequency-converting measurements
Change of the following settings:
• coupling (RBW, VBW, SWT)
• reference level, RF attenuation
• start or stop frequency
• output level of tracking generator
• frequency offset of tracking generator
• detector (max. peak, min. peak, sample, etc.)
Change of frequency:
• max. 625 points within the set sweep limits (corresponds to
a doubling of the span)
• more than 500 extrapolated points within the current sweep
limits (in case of span doubling)
The FREQUENCY OFFSET softkey activates the input of the frequency offset
between the output signal of the generator and the input frequency of the R&S FSQ.
The value range depends on the selected generator.
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 analyzer. In case of a negative frequency
offset it generates a signal below the receive frequency of the analyzer. The output
frequency of the generator is calculated as follows:
Generator frequency = receive frequency + frequency offset
Remote command: SOUR:EXT:FREQ:OFFS 1GHZ
4.244 Operating Manual 1313.9681.12 - 01