Agilent Technologies 8590 Series Service Manual page 560

Softkey Descriptions
Softkey Descriptions
φLock ON OFF Phase Lock On/Off
D Disables locking of the first LO to allow faster response
ESCRIPTION
of the keypad and the sweep when the analyzer has a
poor frequency calibration.
Before a normal sweep, the analyzer uses the frequency
calibration to set the first LO close to the desired value.
It then counts the frequency of the first LO and adjusts
it until the correct frequency is achieved within the
count resolution. Next, it closes the discriminator if the
span is less than 10 MHz, then begins the sweep.
Note that if the frequency calibration is poor, this
procedure of locking the LO requires a long time, often
many seconds or even minutes. During this time the
analyzer does not respond quickly to the keypad. This
key disables locking until a frequency calibration can
be successfully completed.
When the analyzer determines that the frequency
calibration is poor, it automatically disables the first
LO lock and the message VLock OFF will appear on
screen.
+10 V REF DETECTOR +10 V Reference
Detector
D Displays the output of the +10 V reference from the A7
ESCRIPTION
analog interface assembly as a horizontal line along the
top graticule.
Refer to
information.
R S
ELATED OFTKEYS
560
Chapter 4 for additional troubleshooting
−10 V REF DETECTOR
Chapter 13