Acterna SPM-32A, Руководство по эксплуатации, Страница: 87 / 122

SPM-32A ... SPM-36A 4.2 Operation and features
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Normal scale
Scale: 10 dB (dBm) per division
Example: Display of -75 dB (dBm):
Expanded scale
Scale: 1 dB/div.
The expanded scale can be selected or cancelled by
entering the sequence:
The expanded scale is a relative scale and should be
thought of as folding back onto itself. The display increases
or decreases by
±
10 dB at -11 dB or +1 dB (hysteresis to
prevent display jitter at 0 or -10 dB). In other words, only the
relevant section of an expanded display is shown.
-120 -100 -80 -60 -40 -20 0 +20
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. ;
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. .
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. .
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; .
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. .
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. ;
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.
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. ;
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. .
=
. . ; . . . . ; .
*
EXPAND
7