EXFO IQS-1600 High-Speed Power Meter for IQS-500/600 - Manual (Page 57)

Measuring Power
High Speed Power Meter 49
Averaging Measurements
Averaging Measurements
When the averaging function is enabledIQS-1600 High Speed Power Meter,
the most recent measurement samples, for which you can set the number,
are used to compute an unweighted average. This average is displayed as
the measured value. The AVG marker will also be displayed to the right of
the value for the matching channel, indicating that averaging is enabled.
If n < M, then
If n ≥ M, then
Where
³
n is the number of the current acquisition
³
M is the number of points to average (value you set)
³
x[n] is the current sample in watts
³
y[n] is the result of the present average in watts
³
y[n-1] is the value before the average in watts
Note: When measurement conditions change, the number of the acquisition is
reset to zero in order to start a new averaging measurement with the new
settings.
To select the number of samples for averaging, whether you are in the
Instrument function tab or the Channels tab of the Settings function tab,
use the arrow buttons to change the value in the Average (in the Settings
function tab) or Averaging (in the Instrument function tab) lists.
y n [ ]
1
n
--- x n [ ] ⋅ 1
1
n
--- –
⎝ ⎠
⎛ ⎞ y n 1
– [ ] ⋅ + =
y n [ ]
1
M
----- x n [ ] ⋅ 1
1
M
----- –
⎝ ⎠
⎛ ⎞ y n 1
– [ ] ⋅ + =