Instructions

Page 26
4.7.2 Controlling Markers
controls the frequency position of the markers. Creates a set of bottom-row function
keys as follows:
selects which marker is controlled by the marker movement keys. The active
marker is indicated by an arrow (>) in front of its readout.
enables the frequency position of the active marker to be set numerically using
similar frequency entry screens as for Set Centre (see section 4.1.1). Note that the
marker position can be set outside of the current span and therefore off the screen.
moves the active marker to the sweep centre frequency (i.e. the centre of the trace).
This is particularly useful if the active marker is off the screen.
moves the active marker left or right either in frequency steps or from
peak to peak of the trace depending on the Marker Mode (Scroll or Peak
Find). In Scroll mode, a single press moves one pixel on the display and
holding the key down causes it to move continuously in steps of about ten pixels.
4.7.2.1 Controlling Markers with the Hard Keys
The normal function of the five “navigator” hard keys in the
centre of the instrument is to control the markers. This allows
control at all times without the need to select the Marker Setup
or Marker Control sub-group menus.
When the navigator keys are in this mode, the round key
marked Control Markers is illuminated. If not, pressing the
key will restore this mode. Pressing the key repeatedly cycles
through selection of the visible markers (Both Off > M1 Only >
M1 and M2 > Both Off).
Pressing the centre button on the navigator toggles the active marker between M1 and M2, or
turns M2 on if it is off. Pressing the Up key selects Peak Find function, while pressing the Down
key select Scroll function. Whenever the Up key is pressed, the selected marker will jump to
the highest peak.
The Left and Right keys move the active marker left or right either in screen resolution steps or
from peak to peak of the trace depending on the function.
Whenever the navigator mode is changed, an information box appears. This alert can be
turned off if preferred - see section 4.10.3.3.
4.7.2.2 Further Notes on the Use of Markers
Function = Peak Find
Peak Find mode is selected from Marker Setup > Function or from the Navigate Up hard key,
and is indicated by an upwards arrow on the left hand side of the marker readout. The mode is
selected for the marker that is currently active.
Pressing the Navigate Up hard key places the currently selected marker on the largest peak of
the trace.
Pressing the Move Left/Right keys will cause the instrument to attempt to position the marker
on the next peak of the trace in that direction. The peak-find algorithm may sometimes place
the marker on the rising or falling edge of a peak and its performance will depend upon signal
and noise levels.
Marker
Control
Move
Left
M1/M2
Active
Move
Right
Marker
>Centre
Manual
Set