116 8163A/B, 8164A/B, 8166A/B User’s Guide
3 Power Measurement
With modules designed for the 8153A Lightwave Multimeter, for averaging
times of more than 1 second, the displayed power is given by the formula:
Where,
P
new
is the new displayed result,
P
old
is the previously displayed result,
ampleis the value read by the hardware,
T
avg
is the averaging time, as set by the user, and
T
sample
is the time the hardware takes to make a reading.
If the measurement condition change (for example, a range change in
automatic ranging), P
old
is reset and the averaging starts again. This is why
the display update seems faster in automatic ranging.
To set the averaging time to 1 second:
1 Move to the Power Meter channel and press the [Details] softkey.
2 Move to the [AvgTime] parameter and press Enter.
3Move to <1s>, by using the cursor key, and press Enter.
How to Choose the MinMax Mode
MinMax mode measures the incoming power and displays the minimum
value measured, [Pmin], and the maximum value measured, [Pmax]. The
difference between these values,
DP, is displayed in place of P, the power
value. This mode is intended principally for polarization dependent
measurements, but can be used for other types of measurement.
For a Dual Power Sensor, you cannot set the averaging time of the slave
channel, channel 2, directly. By default, the averaging time of the slave
channel, channel 2, is the same value as that for the master channel,
channel 1. See
Table 12 on page -122 for more details.
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