Programming Guide
72 Rev. D7 Jul 2017 Marathon MM
10.8 Sensor Setup
10.8.1 General Settings
U=C sets the physical unit for the temperature value (C or F or K). In case of a changed
physical unit all temperature related parameters (e.g., thresholds) are converted
automatically.
E=0.950 sets the emissivity according to the setting of “ES” command
A=250 sets the ambient background temperature compensation according to the setting of
“AC” command
XG=1.000 sets the transmission
?T asks for the target temperature
?I asks for the internal temperature of the sensor
?Q asks for the energy value of the target temperature
10.8.2 Sample Time
The sample time roughly defines the time between the update of the analog output. On all units this is
factory defined to be equal to the stated response time of the unit. However, LT, G5, MT, 3M, and G7
sensors have the capability to update the analog output at rates faster than the stated response time.
Reducing the sample time will reduce the time that the AD converter is averaging the detector signal.
This reduced averaging can result in considerably more noise in the analog output signal, thus this
setting should not be changed under most circumstances. The sample time can be set to the following
values:
ST=20000 sets sample time to 20 ms, for complete suppressing of 50 Hz noise
ST=16666 sets sample time to 16.6 ms, for complete suppressing of 60 Hz noise
ST=2000 sets sample time to 2 ms, for fastest possible analog update rate that provides a
smooth step response, but with higher noise.
10.8.3 Temperature Pre-Processing
The samples from the AD converter can be processed before or after temperature calculation. The
following filters are available for temperature pre-processing:
FF=0 0 0 switches the filter off. This command is for 2M and 1M devices and allows for
transient events as short as 900 µs in duration to be captured. This mode greatly
increases the amount of noise on the unit’s output.
FF=1 <threshold> 0 averages the last 16 samples. Over the <threshold> no averaging is applied. The
<threshold> is given in AD counts. Use the command Q for getting AD counts.
(default value: <threshold> = 750).
FF=2 0 0 sets the filter to consider the detector response curve for LT, G5, MT, 3M, and G7
devices to allow for transient events as short as 20 ms in duration to be captured.
This mode greatly increases the amount of noise on the unit’s output.
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