HP ESA-L1500A, Руководство пользователя и калибровки

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106 Chapter 4
Front-Panel Key Reference
System (Local)
Remote Port Serial
Option 1AX (RS-232 and Parallel) only. Selects the remote port to allow
programming from an external controller over a serial bus. It allows the
baud rate to be set using the numeric keypad or step keys only. Baud
rate values are as follows: 110, 300, 600, 1200, 2400, 4800, 9600, 19200,
38400, 57600, 115200. Key Access:
System
Power On IP Last
determines the state of the spectrum analyzer when the spectrum
analyzer is powered on. If the Power On function is set to
IP
, the state of
the spectrum analyzer is the same as it is after
Preset
is pressed, when
the spectrum analyzer is powered on. If the Power On function is set to
Last
, then the state that the spectrum analyzer was in when it was
powered off is recalled.
The setting (IP or Last) of the Power On function is not changed by
pressing
Preset
. Use the
Power On IP Last
softkey function to change the
setting of the spectrum analyzer state which is recalled at power on.
Limit lines are not recalled when the spectrum analyzer is powered on.
Key Access:
System
50 MHz osc On Off
turns the internal alignment signal on or off. When the internal
alignment signal is on, the RF input is disabled. Key Access:
System
Alignments
accesses the following
Alignments
menu keys which align the internal
circuitry of the spectrum analyzer, load default values for the alignment
system, turn on the frequency corrections, and adjust the 10 MHz
reference. Key Access:
System
Auto Align
accesses the
Auto Align
menu keys. Selecting
All
turns
on the automatic alignment of all measurement
systems.
All but RF
turns on the automatic alignment of
all measurement systems except the RF section.
(Eliminating automatic alignment of the RF prevents
changes in the input impedance between sweeps, which
could cause input device instability.)
Off
turns off
automatic alignment. When
Auto Align
,
All
, is selected,
“
AA
” appears along the left edge of the display. When
Auto Align
,
All but RF
, is selected, “
AB
” appears.
Key Access:
System
,
Alignments
Align Now
accesses the
Align Now
menu keys and immediately
executes an alignment cycle of the selected system(s).
Softkey selections include
All
(for the alignment of all
systems),
ADC
,
LO
,
IF
, and
RF
. Key Access:
System
,
Alignments
Freq Correct On Off
controls use of some of the correction factors. When
On is underlined, frequency correction factors are used.
When Off is underlined, frequency correction factors
are not used, and
Freq Corr Off
appears on the
display. Turning the correction factors off degrades
frequency accuracy.