Glossary: Frequently Used Terms
R&S
®
ZNC
755
User Manual 1173.9557.02 ─ 13
Limit line:
A limit line is a set of data to specify the allowed range for some or all points
of a trace. Typically, limit lines are used to check whether a DUT conforms to the rated
specifications (conformance testing).
Load match error:
Measurement error caused by a mismatch of the analyzer's receive
(load) port causing part of the signal transmitted through the DUT to be reflected off the
receive port so that it is not measured there. The load match error can be corrected by
means of a two-port calibration (except normalization).
M
Marker:
Tool for selecting points on the trace and for numerical readout of measured
data. A marker is displayed with a symbol (a triangle, a crossbar or a line) on the trace;
its coordinates are shown in the marker info field.
Mathematical trace:
Trace that is calculated according to a mathematical expression,
e.g. the one defined in the Define Math dialog. The expression is a mathematical relation
between constants and the data or memory traces of the active recall set.
Measurement point:
Result of the measurement at a specified stimulus value (fre-
quency/power/time).
Measurement result:
Set of all measurement points acquired in a measurement (e.g. a
sweep). The measurement result is displayed in a diagram area and forms a trace.
Memory trace:
Trace that is associated to a data trace and stored in the memory. Data
traces and the associated memory traces share the same channel and scale settings.
Alternatively, memory traces can be imported from a file.
Mixer:
Device that converts an RF signal at one frequency into a signal at another fre-
quency. The frequency that is to be shifted is applied at the RF input and the frequency
shifting signal (from a local oscillator, LO) is applied to the RF mixer's LO port, resulting
in an output signal at the mixer's Intermediate Frequency (IF) port.
P
Partial measurement:
Measurement at a specified stimulus value maintaining definite
hardware settings. Depending on the measurement type, several partial measurements
may be needed to obtain a measurement point. A full n-port S-parameter measurement
requires n partial measurements with n different drive ports.
Peak:
Local maximum or local minimum (dip) on the trace. In the Trace - Search menu,
it is possible to define a minimum excursion that both types of peaks must have to be
considered valid.
R
Recall Set:
A recall set comprises a set of diagram areas with all displayed information
that can be stored to a VNA recall set file (
*.znx
). Each recall set is displayed in an
independent tab.
