SteppIR
SARK-110
User’s Manual
Rev 1.1.7 October 29
th
, 2014
- 39 -
© Melchor Varela – EA4FRB 2011-2014
The analyzer makes swept reflection measurements over the entire frequency range and
mathematically transforms the gathered data to Time Domain using an inverse Fourier transform.
As a result, the step and impulse responses are plotted on the display, providing information about
the location and the nature of any fault. The impulse response trace (green trace) gives an indication
of the fault location. The step response trace (red trace) provides an indication of the nature of the
fault.
The vertical axis of the graph displays the reflection coefficient: Rho = -1 for short load, 0 for
matched impedance load (ZLoad = Z0), or Rho = +1 for open load. The horizontal axis displays the
distance in meters.
Use Navigator A to highlight
«Mode»
in the main menu.
Press the Select
[
■
]
button to activate the
Mode popup submenu and use Navigator B to highlight
«Cable Test»
submenu mode option. Finally
press the Select
[
■
]
button to enter into Cable Test mode.
This measurement requires the user selection of the cable’s characteristic impedance and velocity
factor. These settings are obtained from the selected cable in the
«Setup»
«Cable Type»
menu
option.
As in the other modes, the measurements are performed continuously and controlled by the
Run/Hold
[
►||
]
button, but in this case it takes some seconds for the results to show on the display
due to the time it takes to make a full frequency sweep.
The distance from the start of the cable to any discontinuity may be found by moving one of the
markers over the discontinuity of interest. The distance of the fault from the start of the cable would
then be shown in that marker’s distance figure.
There is a basic zoom feature controllable from the
«Zoom»
menu option. This allows zooming one
of the four quarters of the graph or the complete span via the option «Extends». See in the
screenshots below the operation of the zoom function in which the measurement of a coaxial cable
line of 27.5 meters and Velocity Factor of 0.66 in open condition (unterminated at the other end) is
shown below:
Summary of Contents for SARK-110
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