Chapter 2 63
Overall Troubleshooting
Troubleshooting Using Front Panel Keys
Align All Now
The
Align All Now key halts normal analyzer operation and forces a
complete realignment of the entire system.
When performing any alignment, the presence of an external 50 MHz
signal is checked. If an external 50 MHz signal > 0 dBm, is detected, the
alignment routine will be skipped and the message “High 50 MHz
power level” will be displayed. If this occurs, remove the 50 MHz
signal from the analyzer input and perform
Align All Now or Align
Subsys
, Align RF.
Align Subsystem
The
Align Subsys key allows you to align the RF, IF, and ADC circuitry
of the analyzer for amplitude accuracy by activating the
Align RF, Align IF, and Align ADC keys. You can also align the current IF
flatness and the system gain of the analyzer (explained below).
The
Align Current IF Flatness key activates an immediate measurement
of the current IF flatness.
The
Align Current SysGain key activates a fine-tuning of the system
gain. This adjustment is done by measuring the response of the current
system state configuration to the 50 MHz amplitude reference signal.
All subsequent measurements are then compensated appropriately for
absolute amplitude accuracy.
Restore Align Defaults
The
Restore Align Defaults key loads the default values for system
alignments, turns on frequency corrections, and resets the timebase to
the factory set values.
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