R&S ZVB - Page 290

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ZVT GUI Reference
Channel Menu
Operating Manual 1145.1084.12 – 30 275
Chopped pulse profile results are measured as follows:
1. The signal is chopped into k measurement intervals of equal width. The interval width is equal to
the time resolution. For each interval, the analyzer acquires measurement results in n consecutive
pulse periods. Due to the periodicity of the signal, the amplitude in each of the measurement
intervals is equal. The results from the individual intervals are integrated; the effective
measurement time per interval is thus n times the interval length. With a suitable selection of the
factor n, this method provides accurate results at common IF bandwidths.
2. After integrating the n results for a given measurement interval, the analyzer steps to the next
interval in order to repeat the procedure above. The total measurement for k measurement intervals
covers k*n pulse periods. The measurement result is a time-domain trace consisting of k integrated
measurement points.
The analyzer automatically selects a CW Time sweep mode and adjusts a number of data acquisition and
pulse generator settings when the chopped pulse profile mode is activated:
 The width of the sync signal pulse (Gen 1) is set equal to the time resolution. The sync signal
controls the width and timing of the measurement intervals in chopped pulse profile mode. After
each sequence of n measurements, the sync signal is delayed by one pulse width so that the next
measurement interval is reached.
 The period of the pulse generator signal (Single Pulse Period or Pulse Train Period, depending on
the selected Pulse Type) is increased to the next integer multiple of the time resolution.
 The number of sweep points k is calculated as the ratio of the extended pulse period to the time
resolution.
 The IF bandwidth is set to 1 over ten times the extended pulse period, and a high selectivity filter
is used.
 Time Resolution selects the distance between two CW time sweep points in the chopped pulse
profile measurement; see background information above. The width of the sync signal is always
equal to the time resolution. Changing one value also affects the other.
 Activate enables the chopped pulse profile mode and adjusts the channel settings as described
above.