Measurements and Result Displays
R&S
®
ESW
111
User Manual 1177.6298.02 ─ 08
carrier or pulse-like interference which is represented in the form of narrow horizontal
lines on the screen.
The accuracy of the frequency axis corresponds to the reference used (internal or
external).
In contrast to normal spectrum analyzer operation, the measured values are deter-
mined using FFT from samples recorded from the A/D-converter. Thus the receiver
stays tuned to the center frequency. It may continue to measure with the selected mea-
surement time and display the signal level with the bargraph.
(For example, the quasipeak level measured with one second measurement time may
be displayed in the upper half of the display while in the lower half the spectrum may
be refreshed every few milliseconds.)
The measurement time of the bargraph may be longer than the measurement time of
the IF analysis. If the measurement time of the bargraph is set to a smaller value then
the measurement time of the IF analysis, the bargraph will as often be refreshed as the
display of the IF analysis.
The level display of the IF analysis is unweighted. It is independent of the selected
detector for the bargraph measurement, e.g. average or quasi peak. A maximum of
three traces can be displayed in parallel. The display mode "Clear / Write", "Max Hold",
"Min Hold", "Average", "View" or "Blank" may be selected independent for each trace.
The displayed level values do have the full accuracy of the instrument only at the cen-
ter frequency. At all other frequencies, the level is typically lower due to the frequency
response of the IF filter and the preselector.
IF Analysis always applies resolution filters with a 6
dB bandwidth, while filters with a
3
dB bandwidth are not supported.
9.3.2
Selecting a Test Sequence
Access
: "Overview" > "Test Automation" > "Overview"
The first tab of the "Test Automation" dialog box ("Overview") represents the measure-
ment stages in an interactive diagram. You can add or remove certain stages from the
measurement as required: you can, for example, configure a measurement that con-
sists of a scan and a peak search, but no final measurement.
Possible combinations are:
●
Perform a scan only.
●
Perform a scan with a subsequent peak search and creation of the peak list.
(Remote command:
●
Perform a scan with a subsequent peak search and a final measurement including
the creation of a final peak list.
(Remote command:
CALCulate<n>:FMEasurement[:AUTO]
Test Automation
