Flintec DAD 141.1 - Manual (Page 53)

DAD 141.1 Technical Manual, Rev. 2.2 - February 2014 Page 53 of 54
12. Calibration and Calibration Sequence
The calibration of DAD 141.1 is only possible after starting a calibration sequence (compare with chapter 10.2).
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Command CE: Calibration enable – returns the current TAC value
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Command CM: Calibrate maximum display – sets the max. allowable display value
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Command CI: Calibrate minimum – sets the minimum allowable display value
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Command DS: Display step size – sets the output incremental step size
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Command DP: Decimal point – sets the position of the output decimal point
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Command CZ: Calibrate zero – sets the system zero point
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Command CG: Calibrate gain – sets the system gain
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Command ZT: Zero track enable / disable
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Command ZR: If applicable: Zero Range – sets the zero range manually
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Command ZI: If applicable: Initial Zero Range
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Command FD : If applicable: Reset to factory default settings
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Command CS : Save calibration data (TAC counter automatically incremented by 1)
Preparing the calibration:
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Check, if the max value of the display is set sufficiently high (see chapter 10.2, command CM)
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Check, if the no motion conditions are defined reasonable (chapter 10.3, e.g. NR = 1, NT = 1000)
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Set the IIR filter frequency to 0.5 Hz (see chapter 10.4, FM = 0, FL = 7)
Example: Setup of zero point, system gain and decimal point
The chosen calibration weight has the value 5000 (increments). That could be 500 g, 5 kg or 5000 kg. We
calibrate with 500 g. The decimal point is set up by command DPx (x = 1, 2 or 3), here 1 figure after the
decimal point. A measured weight of 500 g is displayed as 500.0.
Master (PC / SPS) sends Slave (DAD 141.1) responds Meaning
CE E+000017 (example) Request: TAC counter CE17
Adjust zero: The scale has to be empty. No load!
CE 17 OK Calibration sequence active
CZ OK System zero point saved
Adjust gain: First put the calibration weight on the scale (here 500 g)!
CE 17 OK Calibration sequence active
CG 5000 OK Setting span
CG G+05000 Request: span 5000 d
CE 17 OK Calibration sequence active
DP 1 OK Setting: decimal point 0000.0
CE 17 OK Calibration sequence active
CS OK Save calibration data in EEPROM
Zero point, gain and decimal point position were saved in the EEPROM; the calibration counter (TAC) is
increased automatically by 1.