Agilent Technologies 8590 Series Service Manual page 591

FLATNESS DATA Flatness Data
D
Avoid pressing the
CAUTION
softkey. All the flatness-correction constants will be lost if
pressed accidentally.
R
ELATED
FM COIL DRIVE FM Coil Drive
D
R
ELATED
Chapter 13
Provides access to the softkeys used for viewing or
ESCRIPTION
editing the flatness correction constants. The −2001 Hz
passcode is required when editing the correction data.
INIT FLT
S
EDIT FLATNESS
OFTKEYS
STORE FLATNESS
INIT FLT
Displays the output of the FM Coil Driver produced on
ESCRIPTION
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
COIL DRIVE
2. Press
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
information.
S
FM SPAN
OFTKEYS
FINE TUNE DAC
X FINE TUNE DAC
softkey when pressing the
before pressing
SPAN
function.
to display a positive-going
FM COIL DRIVE
Chapter 6 for additional LO troubleshooting
Softkey Descriptions
Softkey Descriptions
STORE FLATNESS
is
INIT FLT
to select the
CAL FM
591