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The bottom function button zone includes 6 function buttons, which have the same functions as hard keys and are
applied to display various menu names in different measurement modes so as to facilitate measurement.
2 Number input zone
The number input zone includes the direction keys, knob, number keys, Backspace, Cancel and OK. All the input
can be modified by keys and knob in input area. Details of keys in input area are as below.
 Direction keys: The UP and DOWN key are applied to increase or decrease the value. The leftward and
rightward key are not provided here. The step value of the UP and DOWN key is set according to the step
of each parameter.
 Knob: Increase or decrease the value. When the knob is rotated clockwise, the value will be increased;
otherwise, the value will be decreased. The knob can be used with the UP/DOWN key to change the
value, with the same step as the UP/DOWN key.
 Numeric keys: Set the number (including the negative number).
 Backspace: Cancel the last number one by one according to the number status.
 Cancel: Cancel the current invalid data.
 OK: Confirm the current parameter setting.
3 Function key zone
The function key zone at the bottom of the screen is used for changing measurement parameter settings, including
six keys.
 [Freq]: Set the center frequency, starting/stop frequency, span, frequency step, etc. of measurement.
 [Ampt]: Set the reference level, attenuator setting, display scale, unit, pre-amplifier control, etc.
 [Bandwidth]: Set the resolution bandwidth, video bandwidth, detector type, average, etc. of
measurement.
 [Marker]: Set specific parameters of the measurement cursor.
 [Peak]: Obtain the peak parameter.