Agilent Technologies 8935 series e6380a Manuale Utente

Pagina di 320
Chapter 6
211
Analog Measurements - Screens and Control Fields
Control Fields for Analog Measurements
Pos/Neg
See 
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