ADInstruments AD8000 Series Instruction Manual page 50

AD8000 Series Spectrum Analyzer Instruction
Manual
(2) Start Frequency
The start frequency is the frequency value at the very left of the screen.
After pressing 'Start Freq' soft-key, users can change the current start
frequency. There are three methods to input the frequency value: manually
inputting the number, pressing the 'Up/Down' step key to change
frequency and rotating the knob.
After setting start/stop frequency, the former center frequency and sweep
span on the bottom of the screen will be replaced by start and stop
frequency.
Start Frequency
(3) Stop Frequency
After pressing 'Start Freq' soft-key, users can change the current stop
frequency. There are three methods to input the frequency value: manually
inputting the number, pressing the 'Up/Down' step key to change
frequency and rotating the knob, the same as center frequency.
(4) Span Frequency
The span frequency refers to the differential frequency of the very right
point and the very left point of the screen. It is called span for short.
Press 'Span' key to see the following menu.
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Stop Frequency
Fig. 3-5 Start Frequency