Holland Electronics ST-5128S - Manual (Page 14)

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The soft keys F1 – F4 perform the following functions in the Spectrum Analyzer
Measurement Mode:
F1 – REF – Allows the user to adjust the y-axis reference power level
coordinates in 10dB increments.
F2 – MAK- Activates the marker so that the user can adjust the marker
frequency.
F3 – SPA – Toggles the span of the spectrum analyzer between 6 or 12 MHz.
F4- ESC- Exits out of the spectrum analyzer mode and returns to the main menu.
Operation:
1. To adjust the y-axis power level coordinates and reference level
a. Press the F1 (REF) soft key.
b. Adjust the reference level in 10dB increments by using the 
keys
2. To display the power level of specific channel:
a. Press the F2 (MAK) soft key.
b. Move the marker to the desired frequency by using the 
keys.
c. The meter will display the frequency and it’s measured power level at
the top of the screen.
3. To change the frequency span of the spectrum analyzer, press the F3
(SPA) soft key to toggle between 6 and 12MHz.