18
Chapter 1
General techniques
18
Understanding LED indications
The LED indicator between the
N
and
S
terminals
provides an indication of the MTU-TXC status. For most
indications, the LED blinks in a specific pattern that
repeats every 12s.
Fig. 1-9: Instrument LED indicator.
System startup.
•
During system startup, the LED blinks once, then
lights steadily for about 30s.
Initial satellite lock.
To synchronize with UTC and
supply a timing drive, the MTU-TXC must receive
signals from at least four GPS satellites. Under normal
conditions, this takes less than 10min. A longer delay
may indicate poor antenna positioning or a faulty
antenna or cable.
The LED pattern is 1s on, 1s off, for each satellite
acquired, for up to four satellites.
Fig. 1-10: One satellite acquired.
Fig. 1-11: Two satellites acquired.
Fig. 1-12: Three satellites acquired.
Fig. 1-13: Four or more satellites acquired.
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Содержание MTU-TXC
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