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DTF Settings Page
You can set and view all of the DTF settings, including some calculated values, on
the DTF Settings page.
Press Meas Setup 4.
Then Settings.
Then press ▲|▼ arrows to move to a setting. If the setting can be changed, the
Calculated DTF values
Press
c - Start Frequency – Start frequency that is used to calculate DTF.
c - Stop Frequency – Stop frequency that is used to calculate DTF.
c - Range Resolution. Indicates the accuracy of the distance to fault
measurement. For example, with range resolution of 500 mm, if the distance to
fault is 10 meters, this value could be inaccurate by +/- 500 mm or between 9.5 to
10.5 meters. This value is calculated from frequency span / resolution (points).
Response Resolution, not displayed, indicates the distance that could be between
two faults and still show as separate faults. Learn more in Window Settings on
page 33.
c – Maximum Distance. The distance that could be viewed with the current
settings. Defined by: Vf*c*Points/(2*Bandwidth) where:
c – Alias-free Range (On/Off)
About Alias Faults
An alias fault is not a true device response. An alias fault appears because of the
method used to convert frequency to time.
On the DTF Settings page (above) the c - Alias-free Range = Off setting indicates
alias images MAY appear on the screen.
Shorter stop distances (less than 10 meters) and a higher resolution (1001
points) will be more likely to result in Alias-free Range = Off.
DTF (Distance to Fault) Measurements
After using the ▲|▼ arrows or the rotary knob, press Enter. The
increment setting of the arrows is based on the current span and can
NOT be changed in CAT Mode.
After using the keypad, select a multiplier key. Learn about multiplier
abbreviations on page 18.
key is available.
Edit
to view the following calculated values:
Next Page
Vf = velocity factor
o
c = speed of light
o
Points = resolution
o
Bandwidth = frequency range
o
On = No Alias images
o
Off = Alias images may appear in the response.
o
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