SPM-32A ... SPM-36A 4.2 Operation and features
4-47
The following can be entered:
– reference level (REF)
– relative level (REL)
Table 4-7 Level measurements
4.2.5.1 Absolute level (ABS)
The absolute level in dB is the log of the ratio of a voltage to
a reference voltage (0.775 V). When this reference voltage is
applied across a 600 Ω resistor a power of 1 mW is
dissipated.
Designation Result Constants Units
Absolute level ABS dB/dBm
Level difference
1
ABS-REF dB
Reference level
1
2
REF dB/dBm
dBm0/dB0 dBm0
(ABS-REL)
dB0/dBm0
Relative level
1, 2
REL (dBr) dBr
1 No dB/dBm selection
1 Constants which are not recalculated when Constant which are not
recalculated when dB/dBm switchovertakes place or when a new input
impedance is selected.
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