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Chapter 6 211
Analog Measurements - Screens and Control Fields
Control Fields for Analog Measurements
Pos/Neg
See “Level (div)” on page 202
Ref Level
Reference level sets the amplitude reference level for the top line of the
display. All signals displayed are referenced to this line.
Operating Considerations
The unit-of-measure for the reference can be changed as needed. For
instance, 0 dBm, 0.224 V, 107.0 dBmV, and 0.00100 W can all be used to
represent the same level.
Screens on which this field is displayed
SPEC ANL: main controls menu
Ref Mrkr
In the delta marker mode, a second (reference) marker is placed at the
current location of the marker. The first marker becomes a moveable
delta marker. When the delta marker is moved, the difference in
frequency and level between the reference marker and the delta marker
are shown as the Delta Mrkr measurements on the right-hand side of
the screen. The reference marker can be set to either Hold or Norm.
When the Ref Mrkr field is set to Hold, the reference marker is frozen
at its current position (frequency and level) regardless of changes in the
signal level.
When you switch from Hold to Norm, the reference marker will stay at
its current horizontal setting (frequency), but will track the level of the
incoming signal.
When switching from delta mode to normal mode, the delta marker
becomes the normal marker.
Screens on which this field is displayed
SPEC ANL: all menus except mask controls