Instrumentation & Measurement Magazine 25-7 - 43

◗ Displays measurement
test results
online along with
specifications, generation
of test reports
at the end of the test
and online/offline
trend analysis of all
measured parameters
◗ Provides the possible
solution to resolve
the error message log
for all primary error
conditions
◗ An easy graphical user
interface to perform
various functionalities
Most of the current
generation instrumentation
contains LAN as a
primary interface for instrument
control. Still,
legacy instruments and
TCTM simulators utilize
IEEE 488.2 general-purpose
interface bus (GPIB)
and RS-232 interface, respectively. A new generation of advanced
devices like power sensors is also available with a USB
interface. We have adopted LAN as a primary communication
interface and LAN-GPIB/RS232/USB converter. All the
instruments are controlled through a Virtual instrument software
architecture (VISA) communication protocol.
VISA communication protocol consists of the following
typical elements:
◗ VISA-Open: Open a VISA through a specific resource
name (GPIBx::yy::INSTR in case of GPIB interface and
TCPIPn::aaa.bbb.ccc.ddd::INSTR in case of TCPIP interface)
◗ Here x, n = interface number, yy = instrument ID, aaa.bbb.
ccc.ddd = IP address of instrument)
◗ VISA-Write: Writes data to the opened resource name
◗ VISA-Read: Reads data from the opened resource name
◗ VISA-Close: Close the VISA resource name
The advantages of the VISA communication protocol are
as follows:
◗ NI-VISA utilizes similar operations for instrument
communication regardless of the interface type (Serial,
GPIB, USB, and LAN). This enables easy switching of
interfaces and a single software platform.
◗ VISA ensures consistency and easy portability across
different OS platforms through its own set of predefined
data types. Therefore, the VISA application written
in LabVIEW can be easily ported to any platform that
supports LabVIEW.
◗ It is easy to learn the interface and provides a set of
bus-independent API functions through compact
command set.
October 2022
Fig. 6. ATS software I/O configuration.
Software Safety Features
To avoid human errors and ensure the safety of the payload,
the ATS software is equipped with various features such as
auto telecommand generation, TM verification and RF link
verification. Fig. 7 explains the state flow for TM verification.
Experimental Setup and Results
Materials and Methods
For practical measurements and verification of developed
ATS, the DUT is an integrated Ka x Ka transponder hardware
simulator, which consists of a Pre-Select filter (PSF), Low Noise
Amplifier (LNA), downconverter, hybrid, input filter, Linearized
Traveling Wave Tube Amplifier (LTWTA), and OP Demux
Filter with appropriate waveguide plumbing interfaced at input
and output of DUT. Fig. 8 shows the setup diagram. The
uplink frequency is 28.625 GHz, the downlink frequency is
19.825 GHz, and the bandwidth of the DUT is 250 MHz.
As mentioned in previously, four independent measurement
channels namely two SMC, IMDX (Swept IMD) and
NFX (Noise Figure) were created for various parametric measurements.
Here, 'X' represents frequency translation. The
following are the optimum settings in the instrument:
◗ No of points: 6401
◗ Mixer LO frequency: 7.8 GHz
◗ Group delay aperture: 1 MHz
◗ IF bandwidth: 1 kHz
◗ Noise figure impedance states: 4
The ATS setup consisted of Keysight PNA-X (N5244A) Network
Analyzer, Keysight 8257D SSG, Keysight N9030B SA and
IEEE Instrumentation & Measurement Magazine
43

Instrumentation & Measurement Magazine 25-7

Table of Contents for the Digital Edition of Instrumentation & Measurement Magazine 25-7

Instrumentation & Measurement Magazine 25-7 - Cover1
Instrumentation & Measurement Magazine 25-7 - Cover2
Instrumentation & Measurement Magazine 25-7 - 1
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Instrumentation & Measurement Magazine 25-7 - Cover3
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