
Chapter 13 591
Softkey Descriptions
Softkey Descriptions
FLATNESS DATA Flatness Data
DESCRIPTION Provides access to the softkeys used for viewing or
editing the flatness correction constants. The −2001 Hz
passcode is required when editing the correction data.
CAUTION Avoid pressing the INIT FLT softkey when pressing the STORE FLATNESS
softkey. All the flatness-correction constants will be lost if INIT FLT is
pressed accidentally.
R
ELATED SOFTKEYS EDIT FLATNESS
STORE FLATNESS
INIT FLT
FM COIL DRIVE FM Coil Drive
DESCRIPTION Displays the output of the FM Coil Driver produced on
the A7 analog interface assembly. Perform the following
steps to observe the output of the FM coil driver For the
FM spans (LO spans less than or equal to 10 MHz).
1. Activate
SPAN before pressing CAL to select the FM
COIL DRIVE function.
2. Press
FM COIL DRIVE to display a positive-going
ramp.
3. Adjust the span setting while observing the
displayed ramp. The slope of the ramp increases as
the span is increased.
Due to quantization errors, the display appears flat for
LO spans less than 500 kHz. For the main-coil spans
(LO spans greater than 10 MHz) the display is a flat
line.
Refer to Chapter 6 for additional LO troubleshooting
information.
R
ELATED SOFTKEYS FM SPAN
FINE TUNE DAC
X FINE TUNE DAC
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