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Signal Processor
User Guide
LMG GS
4.3 Peak Picker (not available on GST channels)
The Peak Picker function can be used to monitor the highest temperature
measured by the thermometer. This feature is useful especially for moving
targets and/or where the target is obscured partially e.g. by patches of
oxidation an an otherwise un-oxidised surface. The ‘clean’ area will be at the
higher (i.e. true) temperature. The Peak Picker used in Landmark Graphic GS
processors has the following features.
Threshold level
Temperature above which the Peak Picker is active, used
in conjunction with the ON and OFF delay.
ON delay
Time period between the temperature rising above the
threshold level and the Peak Picker function switching on.
OFF delay Time period between the temperature falling
below the threshold level and the Peak Picker function
switching off.
In ‘Hold’ mode, at the end of the ‘OFF’ delay, the
temperature output value is held constant until the
temperature input next rises above the threshold level.
In ‘Reset’ mode, at the end of the ‘OFF’ delay, the
temperature output signal falls to ‘under-range’ until the
temperature input next rises above the threshold level.
In ‘Peak Sample’ mode, the temperature is sampled in
predefined intervals and outputs the peak value of the
most recent interval.
Decay rate
A user-adjustable value at which the stored temperature
output signal decays.
The Peak Picker function can be reset via the CMD (Command) input. The
CMD input connections and operation are shown in Fig. 7 and Fig. 8.
For typical Peak Picker responses, see Fig. 32.
Peak Sample
This function allows the unit to peak pick for a user-
defined period before the output/display is updated.
(Interval 10 to 250 seconds in 1second steps).
For typical Peak Sample responses, see Fig. 33.
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