Comtech EF Data RC-1160 - Manual (Page 36)

Operation Revision 1
RC-1160 RC-1260 Redundancy Switch Controllers MN-RC1160RC1260
3–6
3.3 Calibration
After the unit is installed and properly cabled, a calibration check must be performed. The calibration push-
button is located on the left side of the rear panel.
3.3.1 Calibration Requirement
The calibration of the unit becomes necessary because the controller can operate with LNA/LNB currents from
65 to 600 mA.
During the calibration process, an electronic potentiometer will scale the current reading to the center of the
error window. The potentiometer setting is stored in EEPROM and is recalled upon power-up.
Three requirements are necessary to initiate a calibration:
• LNAs intended for service are connected correctly.
• Controller is in local mode.
• Unit is in manual mode.
If the LNA/LNB current deviates from the initial value by approximately ± 30%, a fault will occur.
NOTE: It is important to calibrate the system only upon initial installation. If the
calibration is performed as part of routine maintenance, the upward or downward drift
of the current will be constantly adjusted.
3.3.2 Calibration Failure
Upon pressing the calibration push-button, the electronic potentiometer will move up or down to center itself in
the error window. Should the LNA/LNB current be ≤ 65 mA or ≥ than 600 mA, the circuit will be unable to
center itself. The fault LED will be on for the respective LNA/LNB.