R&S ZVB - Page 128

R&S
®
ZVA / R&S
®
ZVB / R&S
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ZVT GUI Reference
Trace Menu
Operating Manual 1145.1084.12 – 30 113
The following detectors are available:
 Normal selects the default detector mode where each measurement point is displayed without
modification as soon as it is recognized to be valid. The analyzer then proceeds to the next sweep
point. Normal detector mode ensures that the measurement is performed at maximum speed and
that a meaningful complex result is obtained.
 AVG collects all valid results at each sweep point during the Meas. Time set in the More S-
Parameters, More Ratios or More Wave Quantities dialog and calculates the complex arithmetic
mean value of these results. This yields the complex average of the wave quantities or ratios.
Averaging tends to remove statistical fluctuations (e.g. noise contributions) from the measured
signal.
The average(AVG) detector is also used for the noise figure measurement.
R&S ZVA and R&S ZVT analyzers provide the following additional detectors for ratios and wave
quantities:
 Peak collects all valid results at each sweep point during the Meas. Time set in the More Ratios
or More Wave Quantities dialog and selects the result with the maximum magnitude (maximum
power) as the measurement point. Note that the phase is not evaluated in this process so that
complex conversions (e. g. the calculation of real and imaginary values) do not really make sense.
 RMS collects all valid results at each sweep point during the Meas. Time set in the More Ratios
or More Wave Quantities dialog and calculates the root mean square (RMS) of the linear
magnitude of these results. This yields the magnitude of the measurement point. Note that the
phase is not evaluated in this process so that complex conversions (e. g. the calculation of real
and imaginary values) do not really make sense.
The detector settings have an influence on the displayed trace. They do not affect the number of
measurement points in a sweep (or in a subset of the sweep range) but may increase the sweep time . In
the Peak, RMS, and AVG detector settings, the sweep time cannot be smaller than the
detector observation time (Meas. Time) set in the More Ratios or More Wave Quantities
dialogs. The sweep time can be larger if additional delays are taken into account. Changing
the Meas. Time affects the sweep time. On the other hand, increasing the Sweep Time in the
Channel – Sweep menu leaves the Meas. Time unchanged . The AVG, Peak, and RMS detector
settings appear in the trace line.
Combining different detectors
The detector setting in the More Ratios menu affects the ratio of a numerator and a denominator wave
quantity. This does not place any restrictions on the measurement functionality of the analyzer, because
ratios can also be formed by measuring the numerator and denominator individually and using the trace
functions. A possible application is the comparison of different detector settings for a particular trace.
The analyzer generates a warning if the selected measurement time for AVG, Peak or RMS detectors
is too long. At the same time, bit no. 15 in the ...INTegrity:HARDware status register is set. Reduce
the measurement time and/or reduce the IF bandwidth until the warning disappears.
A warning also appears if the measurement time for RMS detectors is too short. Increase the
measurement time and/or increase the IF bandwidth until the warning disappears.
Remote control:
CALCulate<Ch>:PARameter:MEASure "<Trace_Name>", "<Par>"
CALCulate<Ch>:PARameter:SDEFine "<Trace_Name>", "<Par>"
(the parameter name <Par> also contains the detector)
[SENSe<Ch>:]SWEep:DETector:TIME