
System Startup and Pre-Test Configuration
D-4
72A-1898 Rev. A 11/01
Monday
, November 26, 2001 1:09 pm
System Operation
The system is composed of two functional components, the Instrument
and the controller software, TRXField, running on a laptop. The following
describes the interaction between the two components.
System Startup and Pre-Test Configuration
On power up, the Instrument runs a short self-test to identify all cards and
modules that are present. Once contacted by the controller, the
Instrument transfers its configuration to the controller and it is displayed
as a Virtual Front Panel on the computer's screen.
The channels of interest can be activated from the Virtual Front Panel or
via a Test Plan created with the TRX or TRXField products. The type of
test to perform is selected from a pull down menu on the Virtual Front
Panel.
Test Execution
The controller downloads a list of channels to activate, range settings for
the appropriate channels, and the signal on which to trigger the
recording. Appropriate action by the operator (including the pressing of
the Safety Switch) turns on all of the test voltages and starts the sampling
of all the activated channels. Samples are stored in a circular buffer.
When the predefined trigger signal is detected, the samples are
transferred from the circular buffer to a permanent buffer pending the end
of the test, at which point the information is transferred to the controller.
Data Transfer
The amount of data transferred to the controller is proportional to the
number and type of channels activated. A Main Contact measurement
could be made up of a channel of timing and a channel of pre-insertion
resistance value measurement. Each Analog Channel and/or Auxiliary
Contact channel is a single channel. The internal Trip and Close coil
current channels are individual channels.
Data is compressed and transferred to the controller at 38.4 kbps. The
different channel types compress to varying degrees depending on
content: timing channels compress very well; analog channels do not.
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