Owner manual

LDU 69.1 Technisches Handbuch, Rev. 12 January 2011
Page 16 of 28
8.2.8. CG Set Calibration Gain (Span)
This is the reference point for calibration under load, and is subject to TAC control.
Permitted values are from 1 to 999 999.
Master (PC / SPS) sends Slave (LDU XX.X) responds Meaning
CG G+10000
Request: Calibration weight = 10 000 d
CE E+00017 (example)
Request: TAC counter CE17
CE 17 OK
Calibration sequence active
CG 15000 OK
Setup: Calibration weight = 15 000 d
For calibration an input signal near the display maximum (CM n) will give the best system performance. The
minimum calibration load of at least 20% is recommended. Is the calibration weight smaller than 1% of display
maximum (CM n), the LDU will respond with an error message (“ERR”).
Factory default: 20 000 = 2.000 mV/V input signal
8.2.9. ZT Enable / Disable Zero Tracking
This command enables or disables the zero tracking. ZT = 0 disables the zero tracking and ZT = 1 enables the
zero tracking. Issuing the command without any parameter returns the current ZT value.
Master (PC / SPS) sends Slave (LDU XX.X) responds Meaning
ZT Z:001
Request: ZT status
CE E+00017 (example)
Request: TAC counter CE17
CE 17 OK
Calibration sequence active
ZT 0 OK
Setup: ZT = Disable
Zero tracking will be performed only on results less than +/-0.5 d at a rate of 0.4 d/sec, where d = display step
size (see DS command). The zero can only be tracked to +/- 2% of maximum (see CM n command).
Factory default: ZT = 0 [Disable]
8.2.10. ZR Set Zero Range
This command defines the zero range. Permitted values are from 0 to 999 999.
Master (PC / SPS) sends Slave (LDU XX.X) responds Meaning
ZR R+000100 (example)
Request: ZR = 100 d
CE E+00017 (example)
Request: TAC counter CE17
CE 17 OK
Calibration sequence active
ZR 1000 OK
Setup: ZR = 1 000 d
8.2.11. ZI Initial Zero Range
Defines the initial zero range (0…999999 d). If ZI is non-zero the device will perform an automatic Set-Zero
when the weight stabilizes with the No-motion settings and the weight is within the ZI range. Factory default: 0.
Master (PC / SPS) sends Slave (LDU XX.X) responds Meaning
CE E+00017 (example)
Request: TAC counter CE17
CE 17 OK
Calibration sequence active
ZI 100 OK
Setup: Initial Zero range = 100 d
8.2.12. FD Reset to Factory Default Settings
This command puts the LDU back to a known state. The data will be written to the EEPROM and the TAC will
be incremented by 1.
Note: All calibration and setup information will be lost by issuing this command!
Master (PC / SPS) sends Slave (LDU XX.X) responds Meaning
CE E+00017 (example)
Request: TAC counter CE17
CE 17 OK
Calibration sequence active
FD 0 OK
Factory default setting