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Power Measurement
How to Measure Power
Upper Power Limit and Resolution
Table 3-1 shows the upper power limit and measurent resolution at
various power ranges. As can be seen the resolution decreases as
the chosen [RANGE] decreases. Resolution is always 40 dBm less
than the chosen [RANGE] value. The Upper Power Limit is always
3 dBm greater than the chosen [Range] value.
How to Set the Averaging Time
This is the length of time over which a signal is averaged. Longer
averaging times increase the accuracy and improve the noise
rejection. Longer averaging times also decrease sensitivity.
For averaging times of 1 second or less, a new measurement is
shown at the end of each averaging time. This is drawn in
Figure 3-1. A new measurement is shown on the display at each x.
[RANGE] Upper Power Limit Resolution
10 dBm 19.999 mW 13.000 dBm 0.001 mW −30.000 dBm
0 dBm 1.9999 mW 3.000 dBm 0.1 µW −40.000 dBm
−10 dBm 199.99 µW −7.000 dBm 0.01 µW −50.000 dBm
−20 dBm 19.999 µW −17.000 dBm 0.001 µW −60.000 dBm
−30 dBm 1.9999 µW −27.000 dBm 0.1 nw −70.000 dBm
−40 dBm 199.99 nW −37.000 dBm 0.01 nw −80.000 dBm
−50 dBm 19.999 nW −47.000 dBm 0.001 nw −90.000 dBm
−60 dBm 1.9999 nW −57.000 dBm 0.1 pW −100.000 dBm
−70 dBm 199.99 pW −67.000 dBm 0.01 pW −110.000 dBm
Table 3-1 Upper Power Limits and Resolution for Various Power Ranges
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