R&S ESCI Analyzer - Traces
1166.6004.12 4.107 E-1
TRACE - NEXT menu
MIN HOLD
The MIN HOLD softkey activates the min peak detector. R&S ESCI saves for
each sweep the smallest of the previously stored/currently measured values
in the trace memory. The detector is automatically set to
MIN PEAK. In this
way, the minimum value of a signal can be determined over several sweeps.
This function is useful eg for making an unmodulated carrier in a composite
signal visible. Noise, interference signals or modulated signals are
suppressed by the min hold function whereas a CW signal is recognized by
its constant level.
Pressing the
MIN HOLD softkey again clears the trace memory and restarts
the min hold function.
IEC/IEEE-bus command
DISP:WIND:TRAC:MODE MINH
AVG MODE
LOG LIN
The AVG MODE LOG/LIN softkey selects logarithmic or linear averaging for
the logarithmic level display mode.
At the same time the difference calculation is switched between linear and
logarithmic in submenu
TRACE MATH.
IEC/IEEE-bus command
CALC:MATH:AVER:MODE LIN
With logarithmic averaging, the dB values of the display voltage are averaged
or substracted from each other with trace mathematical functions. With linear
averaging the level values in dB are converted into linear voltages or powers
prior to averaging. Voltage or power values are averaged or offset against
each other and reconverted into level values.
For stationary signals the two methods yield the same result.
Logarithmic averaging bzw. Verrechnung is recommended if sinewave
signals are to be clearly visible against noise since with this type of averaging
noise suppression is improved while the sinewave signals remain unchanged.
For noise or pseudo-noise signals the positive peak amplitudes are
decreased in logarithmic averaging due the characteristic involved and the
negative peak values are increased relative to the average value. If the
distorted amplitude distribution is averaged, a value is obtained that is smaller
than the actual average value. The difference is -2.5 dB.
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