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4.2 Operation and features SPM-32A ... SPM-36A
If a generator with an output impedance of 0 Ω is used for the
measurement, the level result does not change when the
input impedance of the instrument is altered.
Absolute power level (dBm) is the log of a ratio of a power to
a reference power (1 mW).
When Z = 600 Ω voltage and power levels have the same
numerical value.
The following can be measured,
– either the absolute power voltage level in dBmdB or
– the absolute power level in dBm after:
Selecting voltage level or power level (dB/dBm)
You can toggle between voltage level (dB) and power level
(dBm) by pressing the following keys:
• When you select a new input impedance, the power
dissipated is altered, thus altering the power level reading
(see section 4.2.2 on page 4-22).
• The reference level (REF) and the relative level (REL) are
treated as constants and so are not adjusted when a
different level mode (dB/dBm) or a new input impedance
are selected.
ABS
* -
dB/dBm
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