EXFO CT440 Series, Руководство пользователя

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Performing Measurement Scans
CT440
37
Configuring the CT440 for Measurements
3. Set the wanted scanning options according to the instructions given in the following
table.
4.
Click the button or anywhere on the screen outside the window to exit.
Parameter Description
Mode Scanning mode of the CT440:

Single
The CT440 performs a scan of the wavelength range set in the
Start/Stop fields and then stops.
On CT440 with PDL option: if a PDL measurement is required by one
or more traces (see Configuring Trace Parameters on page 39), a
scan is composed of 4 or 6 successive sweeps (depending on the
selected PDL Method ).

Continuous
The CT440 performs a continuous series of scans in accordance with
the interval set in the Interval parameter (see Interval (s) below),
until you click the Abort button.

Single Trig
The CT440 waits for an external trigger on the Trigger In BNC
connector to start a single scan. For more details, see Setting up a
Triggered Scan on page 42.

Continuous Trig
The CT440 waits for an external trigger on the Trigger In BNC
connector to start continuous scanning. For more details, see Setting
up a Triggered Scan on page 42.
PDL Method CT440 with PDL option only.

4 States : the CT440 performs 4 polarization-controlled successive
sweeps to achieve the PDL measurement.

6 States : the CT440 performs 6 polarization-controlled successive
sweeps to achieve the PDL measurement. This provides the best
measurement performance but it takes longer.
Interval (s) Applies to Continuous scan mode only.
Number of seconds between the beginning of two successive scans.

If the interval set is greater than the scan time, the CT440 waits
before the next scan.

If the period of time is lower than the scan time, the CT440
immediately performs the next scan.
In case of PDL measurement, the interval is observed between two
series of 4 or 6 successive sweeps.