APG DCR-1004 user manual - Manual (Page 36)

DCR-1003 and DCR-1004 Rev. A3, 10/08
36
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Temperature Compensation
As air temperature changes, so does the speed of sound. This change can
cause .18% drift in distance for every °C change. Mode 44 allows
compensation in the readings for this change. The DST contains an internal
thermistor which measures temperature in degrees F. By turning temperature
compensation on, the effects of temperature changes may be reduced by 50%.
For the DST temperature sensor to operate properly, it must be shielded from
radiant heat. Because the temperature sensor is internal to the DST, it requires
several minutes to react to air temperature changes.
MODE DESCRIPTION PARAMETERS EXPLANATION
44 Temperature Range = OFF, ON, Selects internal temperature
Compensation temp in F compensation for changes in the
Default = OFF speed of sound, on, off, or view
sensor temperature set by NUM
UP or NUM DN