Owner manual

LDU 69.1 Technisches Handbuch, Rev. 12 January 2011
Page 17 of 28
8.2.13. LC Clear Linearisation
This command puts the LDU back to the initial factory calibration using two calibration points, zero at 0.0 mV/V
and 200 000 d at 2.0 mV/V.
Master (PC / SPS) sends Slave (LDU XX.X) responds Meaning
CE E+00017 (example)
Request: TAC counter CE17
CE 17 OK
Calibration sequence active
LC OK
Linearize clear
8.2.14. LN n Linearisation
This command makes it possible to inspect and correct more than the two normal nodes set by the CZ and CG
command – up to seven nodes are allowed. Issuing the command with only one parameter (1-7) returns the
node in the format: Ln:XXXXXXX YYYYYYY where XXXXXXX is the input level in mV/V (without decimal point)
and YYYYYYY is the displayed number of increments.
The calibration can be done in the following way: LN1 0 0 defines the zero output at zero mV/V input. LN2
200000 100000 defines 100 000 d at +2mV/V input – at least two nodes must be given.
The following table shows a linearization with 3 nodes.
Master (PC / SPS) sends Slave (LDU XX.X) responds Meaning
CE E+00017 (example)
Request: TAC counter CE17
CE 17 OK
Calibration sequence active
LN 1 0 0 OK
Setup: Node 1 = 0 mV/V = 0 d
CE 17 OK
Calibration sequence active
LN 2 100000 100000 OK
Setup: Node 2 = 1 mV/V = 100 000 d
CE 17 OK
Calibration sequence active
LN 3 200000 200000 OK
Setup: Node 3 = 2 mV/V = 200 000 d
CE 17 OK
Calibration sequence active
CS OK
Calibration values saved
LN 3 L3:+200000+200000
Request: Node 3 = 2 mV/V = 200 000 d
Note: Before you re-calibrate with less calibration points use the command LC (as described before).
Factory default: LN = 2 calibration points with 0 mV/V = 0 d and 2 mV/V = 200 000 d.
Hint: By using the load cell’s characteristic data the linearization allows for an electronic calibration (eCal).
8.2.15. CS Save the Calibration Data
This command results in the calibration data being saved to the EEPROM and causes the TAC to be
incremented by 1.
Master (PC / SPS) sends Slave (LDU XX.X) responds Meaning
CE E+00017 (example)
Request: TAC counter CE17
CE 17 OK
Calibration sequence active
CS OK
Calibration values saved
The CS command saves all of the calibration group values, as set by CZ, CG, CM n, DS, DP and ZT. The
command returns ERR and has no updating action unless it is preceded by the CE_XXXXX.