Agilent Technologies 8590L Service Manual page 600

R S
ELATED OFTKEYS
INIT FLT 22 GHz
STORE FLATNESS
MAIN COIL DR Main-Coil Drive
D Displays the output of the main-coil driver produced on
ESCRIPTION
the A7 analog interface assembly. Perform the following
steps to observe the output of the main-coil driver.
1. Activate either
2. Press
3. Change either the span or center-frequency setting
and observe the displayed signal.
• When the span setting is increased (For LO spans
• When the center frequency setting is increased
The combination of the ramp slope and vertical position
represents a voltage that is proportional to the current
in the A6 YTO main coil.
Refer to
information.
R S
ELATED OFTKEYS
Chapter 13
EDIT FLATNESS
or
SPAN
to select the
CAL
greater than 10 MHz), the positive slope of the
displayed ramp increases.
Due to quantization errors, the display appears
flat for LO spans less than 500 MHz.
within a band, the vertical position of the ramp
moves up the screen. The vertical position of the
ramp is a function of the YTO tune frequency.
Chapter 6 for additional LO troubleshooting
FM COIL DRIVE
Softkey Descriptions
Softkey Descriptions
, as needed.
CENTER FREQ
function.
MAIN COIL DR
601