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Operation and Service Guide General Information
+20 +10 +6 0
A
± 6%
�20
± 3%
B
�35
Power Level Being Measured (dBm)
± 1%
�70 �70 �35 �25 �20
0
+20
Power Level Used as Reference (dBm)
Figure 2 Relative Mode Power Measurement Linearity with Power Meter/Sensor at 25° C (Typical)
The chart in Figure 2 shows the typical uncertainty in making a relative power measurement with the E44XX-Series power meter in the Rel (relative) mode. In a relative measurement, two power levels are compared using a single sensor. The typical measurement uncertainty can be found by drawing a vertical line at the power level used as a reference, and a horizontal line at the power being measured. The region where these two lines intersect shows the typical uncertainty. This assumes that the reference power and the measured power are at the same frequency, and neglects errors due to zero set, zero drift, and noise. It also assumes no change in mismatch when mea-
