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Operation
A defined hold time of 999 s (symbol "∞" in the display) will put the device into continuous peak
detection mode.
A low level input (GND) at external input FTC3 will promptly interrupt the hold time and will start the
maximum detection again.
4.4.3 Valley Hold
The output signal follows the object temperature until a minimum is reached. The output will „hold"
the minimum value for the selected duration of the hold time. Once the hold time is exceeded, the valley
hold function will reset and the output will resume tracking the object temperature until a new valley
is reached. The range for the hold time is 0.1 to 998.9 s
A defined hold time of 999 s (symbol "∞" in the display) will put the device into continuous valley
detection mode.
A low level input (GND) at external input FTC3 will promptly interrupt the hold time and will start the
minimum detection again.
Advanced Peak Hold
4.4.4
This function searches the sensor signal for a local maximum (peak) and writes this value to the output
until a new local maximum is found. Before the algorithm restarts its search for a local maximum, the
object temperature has to drop below a predefined threshold. If the object temperature rises above the
held value, which has been written to the output so far, the output signal follows the object temperature
again. If the algorithm detects a local maximum while the object temperature is currently below the
predefined threshold, the output signal jumps to the new maximum temperature of this local maximum.
Once the actual temperature has passed a maximum above a certain magnitude, a new local maximum
is found. This magnitude is called hysteresis.
26
Temp
Hold Time
Figure 18: Valley Hold
Rev. B2 Feb 2017
Output temperature
Object temperature
Hold Time
Time
XR
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