4.4 User-Calibration Parameters
One of the main advantages of the Enhanced Eclipse Model
705 transmitter is that the device does not need to be cali-
brated in the field. Every Enhanced Eclipse Model 705
transmitter is shipped from the factory precisely calibrated.
Part of the advantage of PROFIBUS PA
™
is to provide the
ability to monitor changes and make adjustments to a trans-
mitter. The fieldbus concept allows a user to make calibra-
tion adjustments if deemed necessary.
NOTE: The original factory calibration settings are restored when a new
probe length value is assigned.
Contact the factory for information on how to perform a
User Calibration.
The factory-adjustable calibrated parameters are WINDOW,
CONVERSION_FACTOR, and SCALE_OFFSET.
WINDOW is used to adjust for the variations in the analog
section of the Eclipse TDR measurement engine. CON-
VERSION_FACTOR and SCALE_OFFSET are the main
factory calibration settings.
WINDOW: determines the amount of delay between the
generation of the transmitted signal pulse and the start of
the measurement cycle.
FID_TICKS: a measure of the time to the fiducial (refer-
ence) pulse.
LEVEL_TICKS: a measure of the time to the level of the
product being measured.
CONVERSION_FACTOR: the slope of the factory-set
calibration line.
SCALE_OFFSET: the intercept of the calibration line.
The last parameter in the TRANSDUCER block gives the
firmware version of the transmitter.
FIRMWARE_VERSION: displays the version of the
firmware.
27
57-645 Eclipse Guided Wave Radar Transmitter - PROFIBUS PA
™
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