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Chapter 7. Optional Testing Facilities
Optional tests for the UPLC™, if purchased, are
available to perform channel testing. The ON-OFF
testing can be automated on a timed basis. The
FSK has a manual test.
ON/OFF Automatic Checkback
7.1 General Description
For the system to be fully operational, all termi-
nals must have Checkback facilities, such as;
• UPLC™
• TC-10B w/Universal Checkback
• UCBS (Stand-alone Universal Checkback)
The Automatic Checkback Testing Facility pro-
vides various ways to automatically or manually
test the carrier channel. Components of the
Checkback system include:
• PC for controlling settings and operation
• User selectable encoded or timed carrier oper-
ation
• Optional timed communication fallback
• Optional low power tests
• Optional carrier recovery
• Automatic checkback tests done either period-
ically or at user-specified times
• Loopback test capability
• Remote communications
• Automatic clock synchronization
7.1.1 PC Interface for Controlling
Settings & Operation
Please refer to the UPLC™ Installation Guide for
details. Although, a sample checkback page and
test results are shown in Figures 7–1 & 7–2
respectively.
7.1.2 User Selectable Encoded or
Timed Carrier Operation
The Automatic Checkback lets you set your com-
munication to a simple keyed on/off timed carrier
or a more powerful encoded data message.
7.1.3 Optional Timed Communication
Fallback
The Primary Communication mode is initially
used for checkback tests. If the primary mode is
"encoded" and it fails and Timed Fallback
Communication is enabled, the module attempts
one more try using a simple timed communication
mode. If that succeeds, the module only issues a
minor alarm.
7.1.4 Optional Low Power Tests
When enabled, the Automatic Checkback per-
forms checkback tests at both high and low power.
The system issues a minor alarm if only the low
power test fails, and a major alarm if the high
power test fails.
7.1.5 Optional Carrier Recovery
This mode is to verify that any checkback test fail-
ures were legitimate hardware failures and were
not caused by a brief noise burst. When enabled,
the unit starts "carrier recovery mode" after a
failed checkback test. In carrier recovery mode,
the "master" initiates a checkback test using a
more frequent user interval, for example, every 15
minutes. After three consecutive successful check-
back tests, the "master" reverts to normal opera-
tion and sets the "successful carrier recovery" out-
put. If three successful consecutive checkback
tests fail, the "delayed alarm" output is set.
Remotes in carrier recovery mode suspend all
checkback tests and wait until they receive three
good checkback tests from the "master". At that
time they also resume normal operation.
Copyright © AMETEK
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