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User Guide
Signal Processor
LMG GS
4.2 Track and Hold
Refer to Fig. 31. The Track and Hold time function is useful especially for
measuring intermittent processes e.g. items on a conveyor belt. The presence
of a ’hot’ object can be used to activate the ‘Track’ function, which causes
the output to display the temperature of the object. When the object moves
from the measurement area, the ‘Track’ function can be switched off and the
temperature value held until the next ‘hot’ object appears.
The Track and Hold function function is controlled via the CMD (Command)
input. The CMD input connections and operation is shown in Fig. 7 and Fig. 8.
Fig. 31 - Graphical representation of Track and Hold time function
238031
Te
m
p
Time
Command
0V
+V
Track
Hold
Track
Hold
Command signal = Closure of potential-free contacts, s/c = Hold
TTL level (0 to 5V )
+5V = Track
or 0 to 24V
+24V = Track
0V = Hold
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