EXFO PM-1600 High-Speed Power Meter - Manual (Page 32)

Acquiring Power Measurements
22 PM-1600
Displaying Averaged Measurement
Displaying Averaged Measurement
To display averaged power measurement,
1. If necessary, select the desired channel (PM-1620).
2. Press Avg.
When averaging is enabled, the AVG marker appears at the top of the
display for the matching channel. The most recent measurement samples,
of which the number is set in the System Setup menu (see Choosing a
Number of Measurements for Averaging on page 36), are then used to
compute an unweighted average.
Setting Measurement Range
The measurement range (or gain scale) applied to the power
measurement detector can be manually selected to prevent the automatic
scale adjustment performed by the instrument. A manual adjustment of
the dynamic gain scale will lock the measurement range to a specific level.
The measurement range should be locked when the analog output (see
Using the Analog Output on page 65) is used to avoid variations in voltage
output due to scale changes. It is also necessary to use a manual range to
achieve high-rate, programmed acquisitions
(see Programming Data
Acquisitions on page 45).
Two types of manual ranges are available:
➤
The Low range provides a lower dynamic range (typically 22 dB) per
scale with better signal-to-noise ratio and resolution.
➤
The High range provides a higher dynamic range (typically 42 dB) per
scale with an inferior signal-to-noise ratio. In the PM-1620 model, each
channel is adjusted independently.
Acquiring Power Measurements
22 PM-1600
Displaying Averaged Measurement
Displaying Averaged Measurement
To display averaged power measurement,
1. If necessary, select the desired channel (PM-1620).
2. Press Avg.
When averaging is enabled, the AVG marker appears at the top of the
display for the matching channel. The most recent measurement samples,
of which the number is set in the System Setup menu (see Choosing a
Number of Measurements for Averaging on page 36), are then used to
compute an unweighted average.
Setting Measurement Range
The measurement range (or gain scale) applied to the power
measurement detector can be manually selected to prevent the automatic
scale adjustment performed by the instrument. A manual adjustment of
the dynamic gain scale will lock the measurement range to a specific level.
The measurement range should be locked when the analog output (see
Using the Analog Output on page 65) is used to avoid variations in voltage
output due to scale changes. It is also necessary to use a manual range to
achieve high-rate, programmed acquisitions
(see Programming Data
Acquisitions on page 45).
Two types of manual ranges are available:
➤
The Low range provides a lower dynamic range (typically 22 dB) per
scale with better signal-to-noise ratio and resolution.
➤
The High range provides a higher dynamic range (typically 42 dB) per
scale with an inferior signal-to-noise ratio. In the PM-1620 model, each
channel is adjusted independently.