Tektronix ATECTekRanger User Manual page 43

Setups
Test Range
Test Range specifies the maximum fiber distance over which test
data is acquired. To avoid ghosting, the test range should be set to a
little longer than the full length of the fiber.
Test Range depends upon laser wavelength selected. When switching
between laser wavelengths (on dual-wavelength instruments), the
Test Range parameter automatically changes to accommodate the
laser currently selected.
Test Range and Pulsewidth setups are interdependent. Pulsewidth
parameters are displayed with the Test Range parameters. If you
change the test range, and the current pulsewidth is incompatible, the
closest compatible pulsewidth is automatically selected.
Test Range selections depend on the wavelength. Factory default
depends on the Fiber Scan setup and the wavelength selected.
Factory default is Auto in IntelliTrace and End of Fiber modes. In
Manual mode, factory default is 4 km for 850 nm multimode, 8 km
for 1300 nm multimode, and 20 km for all other wavelengths.
Pulsewidth
Pulsewidth specifies the length of time the laser is on during each
sampling acquisition, measured in distance units. A sampling
acquisition is the acquisition of one complete set of data points on a
waveform.
Short pulsewidths permit more detail but have limited range. Long
pulsewidths permit longer range but provide less detail.
Certain pulsewidths are not available on some wavelengths. When
switching between laser wavelengths (on multi-wavelength
instruments), the Pulsewidth parameter may change.
TFS3031 TekRanger/TekRanger 2 User Manual
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