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Using The Linear Resolution Mode
Frequency Spans in the Linear Resolution Mode
Real·Time Bandwidth
The real-time bandwidth ( RTBW) is the maximum frequency span you can measure without missing
input data. At spans greater than the RTBW, the analyze(s processing time exceeds its data
collection time and part of the input signal is ignored while the previous time record is processed.
When measuring periodic signals, the RTBW is not important because any data lost in one record is
repeated in the next record. However, RTBW is very important when measuring nondeterministic
signals. With fast averaging on, the HP 3563A's maximum real time bandwidths in the linear
resolution mode are 10 kHz for single-channel measurements and 5 kHz for dual-channeL
To achieve the greatest possible RTBW, you need to limit the number of display calculations
required. The less you require of the display, the faster the measurement can run. For example, fast
averaging and the single display format provide a greater RTBW than normal display updating and
two active traces. One simple way of minimizing display time is to activate fast averaging (in the
AVG menu) and select the single display format (the SINGLE hardkey). The message "Real Time"
is displayed in the lower right corner of the trace at the end of the measurement if there were no
gaps in the data.
Note
The HP 3563A double-buffers the input signals, so 1- and 2-average measurements
are always in real time.
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