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
1.5volts. The external trigger signal must be a 0 V to +5 V TTL signal.
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.