User`s guide

EXIT
SHOW
EXIT
UTILITY
removes the screen annotation left after pressing SHOW OPTIONS .
Front-Panel Key Access: (j-1
Option 105 only. Option 101 is recommended.
exits the gate utility returning to the gate control menu. The spectrum
analyzer is returned to normal operation. The state of the spectrum analyzer
becomes the state of the window that was active when exiting the gate utility.
Front-Panel Key Access: CSWEEP)
EXTERNAL
activates the trigger condition that allows the next sweep to start when an
external voltage (connected to EXT TRIG INPUT on the rear panel) passes
through approximately 1.5 volts. The external trigger signal must be a
0 V to + 5 V TTL signal.
Front-Panel Key Access: m
EXTERNAL
PREAMPG
adds a positive or negative preamplifier gain value, which is subtracted from
the displayed signal. The EXTERNAL PREAMPG function is similar to the REF
LVL OFFSET function; however, with the EXTERNAL PREAMPG function,
the attenuation may be changed depending on the preamplifier gain entered.
A preamplifier gain offset is used for measurements that require an external
preamplifier or long cables. The offset is subtracted from the amplitude
readout so that the displayed signal level represents the signal level at the
input of the preamplifier. The preamplifier gain offset is displayed at the top
of the screen and is removed by entering zero. The preamplifier gain offset
is entered using the numeric keypad. Press CAL STORE if you want the
spectrum analyzer to use the current preamplifier gain offset when power is
turned on. Preamplifier gain offset is set to zero when DEFAULT CONFIG is
pressed. The preamplifier gain value is not affected by an instrument preset.
Front-Panel Key Access: (AMPLITUDE]
FFT
MARKERS
if the FFT mode is already active, pressing FFT MARKERS only activates the
FFT markers. If the FFT mode is not active, then the FFT marker will be
activated and the FFT annotation will be displayed but an FFT will not be
performed. Pressing the % AM ON OFF key will give a valid value for the
signal in trace B. Press FFT OFF to return the spectrum analyzer to normal
operation.
An FFT trace can be saved and recalled. If a trace has been recalled,
FFT MARKERS can be used to activate the markers so that the trace can be
evaluated.
Front-Panel Key Access: [MEAS/USER]
7-42 Key Descriptions