Tektronix NetTek YBT250, Руководство пользователя

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Appendix A: Specifications
YBT250 Field Transmitter & Interference Tester User Manual
A- 17
Table A- 3: Spectral analysis characteristics (Cont.)
Characteristic Description
The amplitude accuracy for Noise-like signals is
degraded when averaging is turned on. This is
approximately a 2.5 dB degradation due to the
averaging being done after the logging instead of
before. Any accuracy for noise-like signals using a
marker will be impacted greatly by the user not
necessarily knowing the effective IF noise bandwidth,
and less so by this error. Therefore it is recommended
that the user utilize power measurement routines
instead of markers for any noise-like signals.
Vertical Scale Factor
Units 1 dB to 10 dB in 1 dB increments
Display Modes Normal -- updates display with each new result
Max Hold -- updates displayed point only if new point >
old point
Min Hold -- updates displayed point only if new point <
old point
Max/Min Hold -- displays a bar between Max Hold and
Min Hold
Average -- displays average of N (specified by user)
results
Reference Information:
Average is calculated as follows -- The last N values
are saved in memory; when a new result is available,
the earliest result of the N stored values is discarded,
the new average is calculated from the stored values. If
the number of results is less than N, then all of the
results are averaged together.
Number of Averages
1
≤
N
≤
99