Dedicated Controls
4–14
2715 User Manual
11. Press [AUTO] to place the resolution bandwidth in the automatic mode.
The red LED lights. You can take the 2715 out of AUTO mode by pressing a
RES BW arrow key or by pressing [AUTO].
12. Set the span/div to 50 MHz.
13. Note the indicated resolution bandwidth.
14. Press [
b
] in the RES BW function block.
The LED turns off, and the resolution bandwidth goes to 300 kHz.
15. Press [AUTO].
The LED lights, and the resolution bandwidth is switched back to 5 MHz.
16. Press [AUTO] again.
The LED turns off, but the resolution bandwidth is still 5 MHz. Toggling out
of the AUTO mode with [AUTO] maintains the automatically selected
resolution bandwidth until you change it with a RES BW arrow key.
700.0MHz
(AUTO SWEEP)
ATTN 20DB
28.8DBMV
VF WIDE
50.0MHz/
10 DB/
5MHz RBW (AUTO)
Channel Name CH nn
CALIBRATOR
A video filter is a postdetection filter (sometimes referred to as a noise-averaging
filter) used to reduce noise in the displayed spectrum to its average value,
making low-level signals more easily detectable. Normally, the 2715 uses a
video filter about as wide as the resolution bandwidth. This limits postdetection
noise, but does not significantly alter the displayed amplitude of narrow-band
signals. However, if you must measure very wideband or pulse-like signals, you
may wish to use a filter somewhat wider than that automatically selected by the
2715. See Menu-Entered Control Settings on page 6–60.
The video filter width is indicated in the on-screen readouts by VF bandwidth,
where bandwidth is equal to the bandwidth of the video filter being used. This is
true except in the case of the 5 MHz or the 1 MHz filter where the WIDE video
filter is automatically selected. You can select WIDE video filter for any
resolution bandwidth.
Video Filter
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Страница 25: ...Getting Started ...
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Страница 109: ...CATV Measurements ...
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Страница 318: ...Appendix C System Messages C 16 2715 User Manual ...
Страница 334: ...Appendix E External Input and Output E 12 2715 User Manual ...
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