dBm Scaling
The dBm function is logarithmic, comparing power delivered to a reference resistance, relative to 1 mil-
liwatt:
dBm = 10 x log
10
( reading
2
/ reference resistance / 1 mW )
The reference resistance value (Ref R) may be 50, 75, 93, 110, 124, 125, 135, 150, 250, 300, 500, 600
(default), 800, 900, 1000, 1200, or 8000 Ω. Press Ref R and use the front panel up and down arrows to
make your selection.
See Also
Math - Introduction
Null
Statistics
Limits
Features and Functions
104
Keysight Truevolt Series Operating and Service Guide
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