Ametek UPLC CU44-VER04, Applications Manual

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Page 7–2
UPLC™ Application Manual
7.1.6 Automatic Checkback Tests
done Periodically or at User-
Specified Times
You can set the "master" to perform automatic
checkback tests after the interval you specify has
elapsed (e.g., six hours), or up to four specific
times each day (e.g., 1:00, 13:00, 5:00, and 23:00).
These four times specify the hour during which
you want an automatic checkback test to occur.
7.1.7 Loopback Test Capability
You can command a distant Automatic checkback
system to key its carrier for a duration you speci-
fy (e.g., 30 seconds), giving you time to set your
local receiver's sensitivity or perform other tasks.
Loopback tests are performed at both high and low
power. If loopback duration is set to 30 seconds,
the carrier is keyed on high power for 30 seconds,
then low power for 30 seconds.
7.1.8 Remote Communications
You can remotely communicate with a distant
Automatic checkback system in the network. This
lets you get settings, events and counts, and allows
you to change settings, clear events, etc. from a
unit many miles away.
7.1.9 Automatic Clock
Synchronization
When enabled, the "master" checkback synchro-
nizes the clocks of all remotes in the network start-
ing at 12:30 a.m.
7.1.10 Available alarms
• Major & Minor alarms
• Delayed alarm
• Test in progress
• Successful test
• Successful carrier recovery
• Disable automatic tests
7.2 System Configuration
The simplest network configuration for the
Checkback system comprises two terminals: one
designated as the master; the other as the remote.
The maximum number of terminals you can have
in a network depends on their Primary
Communication Mode setting. This setting may be
either "timed" or "coded". With the "timed" set-
ting, you can have up to five units in a network,:
one master and four remotes. With the "coded"
setting, you can have up to eleven units in a net-
work: one master and ten remotes. (see Figures
7–3 & 7–4)
7.3 Rear Panel Connections
7.3.1 Checkback Inputs
CB Test Initiate –Momentarily closing the
input, connected here, initiates a check-
back test.
Loopback Initiate –Closing the input, con-
nected here, initiates a loopback test.
!
CAUTION
Circuit boards can be inserted or removed while
the chassis has power supplied to it. However,
extreme care should be exercised when insert-
ing or removing them.