Acterna SPM-32A - Level Mode

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4.2 Operation and features SPM-32A ... SPM-36A
Example: Setting the 25 Hz filter bandwidth
4.2.5 Level mode
The results are displayed in terms of an absolute level or a
level difference.
Levels express the ratio of two quantities. One quantity may
be a reference, i.e. a certain power or a certain voltage
(dBm, dB) and these are referred to as absolute levels.
Relative levels are the difference between two levels.
The instrument can measure the following:
– absolute voltage and power levels (ABS)
– level differences (ABS-REF)
– level in dBm0
*
4
25
ABS dBm0
ABS
→
REF
ABS-
REL(dBr)REF
REF