SPM-32A ... SPM-36A 4.2 Operation and features
4-55
The dBm0 mode is selected by entering:
Level in dBm0 = Abs. level (dBm) - Stored rel. level (dBr).
If you select "dB" instead of "dBm", the voltage level referred
to a 0 dBr point is measured (dB0). The stored reference
level is not adjusted when "dB" is selected.
Relative level (REL)
Unlike an absolute level, a relative level is the difference in
level between any point in a transmission system and the
level at a reference point. At the reference point the relative
level equals 0 dB (see figure 4-20, page 4-54).
The relative level is determined by the level plan and so
need not be measured. It is entered as a constant.
• The current value of the reference level is shown in row D
of the display. The relative level can be set in the same
way as the reference level (see 3.2.5.2).
dBm0
Example
:
Measured level
-64.5 dBm (ABS)
- Relative level -15.0 dBr (REL)
Level in dBm0
-49.5 dBm0
*
REL (dBr)
ABS
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