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Spectrum Analyzer Mode Key Descriptions
Spectrum Analyzer Mode Functions
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
i-TRIG)
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 analyzer to use the current preamplifier gain offset
when power is turned on. Preamplifier gain offset is set to
zero when DEFAULT
COMFIG
is pressed. The preamplifier
gain value is not affected by an instrument preset.
6-70
Front-Panel Key Access
C-j