102 8163A/B, 8164A/B, 8166A/B User’s Guide
3 Power Measurement
To set the power unit to dBm:
1 Move to the [P] parameter and press the [Power Unit] softkey. You will
see the menu in Figure 57 on page -102.
Figure 57 Selecting the Power Unit
2Move to <dBm>, by using the cursor key, and press Enter.
How to Set the Calibration Offset
This is a calibration offset that you can enter to compensate for external
optical circuitry, for example, the 81022FF Integrating Sphere or a 3 dB
coupler. The calibration offset, [Cal], is automatically subtracted from the
input signal.
P
measured
(dBm) = P
input
(dBm) - CAL(dB)
Where,
P
measured
is the adjusted value of the signal read in dBm,
P
input
is the input signal level in dBm, and
CALis the calibration offset in decibels (dB).
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