Concepts and Features
R&S
®
ZNC
16
User Manual 1173.9557.02 ─ 13
Use the "Alternated" mode to increase the accuracy of measurements on DUTs with long
level settling times (e.g. quartzes, SAW filters). To measure DUTs with short settling times
and obtain a trace from the beginning of the sweep, use "Chopped" mode. In "Auto" mode,
the analyzer will optimize the display update: Fast sweeps are performed in "Alterna-
ted" mode, slower sweeps in "Chopped" mode.
As an alternative to activating the "Alternate" mode, it is possible to insert a "Meas.
Delay" before each partial measurement and thus improve the accuracy. The delay slows
down the measurement.
Relation to trigger settings
In triggered measurements, "Alternated" has no effect if the triggered measurement
sequence is identical to a single sweep point. The following table shows how the analyzer
performs a sweep comprising m sweep points, assuming that each of them requires n
partial measurements.
Triggered Meas.
Sequence
Alternate On
Alternate Off
Sweep
Trigger event starts n partial sweeps over
all sweep points.
Trigger event starts m complete
measurements at consecutive sweep
points.
Sweep Segment
Trigger event starts n partial sweeps over
the next segment.
Trigger event starts complete meas-
urements at all consecutive sweep
points in the segment.
Point
All partial measurements of each sweep
point are carried out one after another.
All partial measurements of each
sweep point are carried out one after
another.
Partial Measurement
Each partial measurement is carried out for
all sweep points.
All partial measurements of each
sweep point are carried out one after
another
3.1.4.2
Stimulus and Sweep Types
The function of the "START", "STOP", "CENTER" and "SPAN" keys depends on the
sweep type.
Table 3-1: Function of STIMULUS keys
Sweep type
START [unit]
STOP [unit]
CENTER [unit]
SPAN [unit]
Lin. Frequency
Log. Frequency
Segmented Frequency
Start Frequency [Hz]
Stop Frequency [Hz]
Center Frequency [Hz]
Frequency Span [Hz]
Power
Start Power [dBm]
Stop Power [dBm]
CW Frequency [Hz]
CW Frequency [Hz]
CW Mode
CW Frequency [Hz]
CW Frequency [Hz]
CW Frequency [Hz]
CW Frequency [Hz]
Time
CW Frequency [Hz]
Stop Time [s]
CW Frequency [Hz]
CW Frequency [Hz]
Basic Concepts