Quiescent Currents Automatic Adjustment Procedure - Hitachi EC701HP Operation Manual

Section 6 - Preventive / Corrective Maintenance
E-Compact Transmitters
6.2.1

Quiescent currents Automatic adjustment procedure

Due to natural variations of LDMOS devices as they operate over time, it is recommended to re-
do the setting of the quiescent current of the amplifier modules' transistors. This "re-tuning"
procedure has been automated and is done by accessing the Transistor Aging Adjustment screen
(21/21) in the Setup menu of the digital driver and it will take only a few seconds. Here is the
recommended frequency to perform this procedure:
• Once after 3 months of operation
• Once every 6 months

Manual Rev. 0.0 - June 2016
NOTE: For Further details regarding the Quiescent Currents Automatic
adjustment, refer to section 5 of the device's manual.
6-5