R&S FSQ Signal Analyzer - Rohde & Schwarz

R&S FSQ Instrument Functions
Basic Settings
The RELATIVE scaling is always suitable, if masks for bursts are to be defined in the
time domain, or if masks for modulated signals are required in the frequency
domain.
An X offset with half the sweep time may be entered in order to shift the mask in the
time domain into the center of screen.
Remote command: CALC:LIM3:CONT:MODE ABS
CALC:LIM3:UPP:MODE ABS
CALC:LIM3:LOW:MODE ABS
Unit - Select the vertical scale units for the limit line
The selection of units takes place in a selection box. The default setting is dBm.
Remote command: CALC:LIM3:UNIT DBM
Limit - Select upper/lower limit
A limit line can be defined as either an upper or lower limit.
Remote command: -- (defined by key words :UPPer or :LOWer)
Margin - Setting a margin.
The margin is defined as the signal-level distance to the limit line. When the limit line
is defined as an upper limit, the margin means that the level is below the limit line.
When the limit line is defined as a lower limit, the margin means that the level is
above the limit line. The default setting is 0 dB (i.e. no margin).
Remote command: CALC:LIM3:UPP:MARG 10dB
CALC:LIM3:LOW:MARG 10dB
Threshold – Selection of the threshold value with relative Y scaling
With relative Y scaling, an absolute threshold value can be defined which lowers the
relative limit values. The function is useful especially for mobile radio applications
provided the limit values are defined in relation to the carrier power as long as they
are above an absolute limit value.
Example:
Ref -20 dBm Att 10 dB
RBW 300 Hz
VBW 3 kHz
SWT 100 ms
Marker [T1]
-28.4 dBm
200.0100 MHz
resulting limit
absolute threshold
Center 200 MHz 10 kHz/
Span 100 kHz
relative limit line
4.160 Operating Manual 1313.9681.12 - 01