Dtf Measurement Settings; Dtf Measurement (Format); Dtf Start And Stop Distance - Agilent Technologies FieldFox N9912A User Manual

7. Disconnect any components or antenna that should NOT be measured and
8. Press Meas Setup 4 then
9. Either press
10. Connect the start end of the DUT to the FieldFox.
11. Press Meas Setup 4 then

DTF Measurement Settings

You can set and view all of the DTF settings, including some calculated values, on
the DTF Settings page. Learn more on page 35.

DTF Measurement (Format)

You can select from 3 different DTF Formats.
 Press Measure 1
 Then choose from:

DTF Start and Stop Distance

In DTF measurements, you set the physical length of cable or other device to be
tested. The FieldFox calculates the frequency range of the measurement from
this distance. The longer the cable to be tested, the lower the frequencies that
are used. You can also set the frequencies manually using the Frequency Mode
[Bandpass] setting.
How to set Start and Stop Distance
 With a DTF measurement present, press Freq/Dist .
 Then choose from the following:
DTF (Distance to Fault) Measurements
connect a LOAD at the end of the DUT.
Recall Coax
of the DUT.
Loss
setting is False, then you may see Alias faults on the screen. Learn more on
page 35.
Distance to Fault (dB)
o
format, expressed as a positive number in dB.
DTF (VSWR) Faults are displayed on the Y-axis in SWR. Learn more about
o
SWR at the FieldFox Supplemental Online Help:
http://na.tm.agilent.com/fieldfox/help/
then Faults are displayed on the Y-axis in linear (unitless)
More DTF Lin
o
format.
Enter a value using the numeric keypad, the ▲|▼ arrows,
Start Distance
o
or the rotary knob, then Enter. By default, the Start Distance is set to 0
Meters. This means that the measurement will display faults starting at the
point at which calibration standards are connected.
Stop Distance Enter a value between the start distance and 5 km (or
o
16,404 ft.) using the numeric keypad, the ▲|▼ arrows, or the rotary knob,
then Enter .
DTF Cable Specifications.
Cable, or enter the Velocity Factor
then
Settings Next
Faults are displayed on the Y-axis in return loss
and Cable
Page. If the Alias-free Range
29