SteppIR SARK-110, Руководство пользователя

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SteppIR
SARK-110
User’s Manual
Rev 1.1.7 October 29 th , 2014 - 5 - © Melchor Varela – EA4FRB 2011-2014
1 Introduction
The SteppIR SARK-110 Antenna Analyzer is a pocket size instrument providing fast and accurate
measurement of the vector impedance, VSWR, vector reflection coefficient, return loss, and R-L-C
(as series or parallel equivalent circuits). Additionally, the analyzer features a TDR (Time Domain
Reflectometer) mode which is intended for fault location and length determination in coaxial cables
as well as a programmable RF signal generator.
The SteppIR SARK-110 is intended for standalone operation but also operates connected to a
personal computer in combination with the SteppIR SARK Plots client software for Windows, further
enhancing the capabilities of the instrument.
Typical applications include checking and tuning antennas, impedance matching, component
testing, cable fault location, measuring coaxial cable losses and cutting coaxial cables to precise
electrical lengths. As a signal generator it is ideal for receiver calibration, sensitivity tests,and signal
tracing.
The SteppIR SARK-110 features a Direct Digital Synthesis (DDS) generator with a range of 0.1 to
230 MHz and a frequency resolution of 1 Hz. The instrument has full vector measurement capability
and accurately resolves the resistive, capacitive and inductive components of a load. The
measurement reference plane is automatically adjusted via the Open/Short/Load calibration
standard for higher measurement accuracy. Also, the analyzer implements a transmission line
addition or subtraction feature in order to make antenna measurements while discounting the effect
of the feed line.
The user interface, based on a color display, has been designed to be intuitive and easy to use. The
graphical impedance displays provide a quick view of the antenna impedance characteristics on a
user-selected sweep range. This includes the graphical plot of two user-selectable parameters in a
scalar chart or the complex reflection coefficient in Smith chart form. To help speed up
measurements, two markers are available, both of which are user positionable or can operate in
automatic tracking mode.
The Multiband mode is a unique feature of the SteppIR SARK-110 whereby it is able to display
simultaneously the plot of an impedance parameter in four scalar charts. This feature is ideal for
tuning multiband antennas.
Also included is a single frequency measurement mode which presents a complete impedance
parameter analysis at a user selectable frequency and displays diagrams of equivalent circuits.
The analyzer uses an internal 2MB flash disk for the storage and recall of measured parameters,
screenshots, analyzer configuration and firmware updates. This disk is accessible via USB so the