User`s guide
6-24 Agilent 4155C/4156C User’s Guide Vol.2, Edition 6
Analyzing Measurement Results
Manual Analysis
To Draw Tangent to Specified Point of Measurement 
Curve 
1. Press LINE primary softkey.
2. Set LINE SELECT softkey to 1 or 2. Selecting this softkey toggles the setting.
3. Set LINE secondary softkey to ON. A line and two cursors are displayed. 
Selecting the LINE secondary softkey toggles as follows:
OFF → ON → OFF
4. Select TANGENT MODE secondary softkey if it is not highlighted. Softkey 
becomes highlighted. The cursors disappear and marker appears. Selecting 
TANGENT MODE toggles between highlighted and not highlighted.
5. Move marker to the desired measurement point by rotating rotary knob.
When lines are displayed and when ON is set in the LINE PARAMETER field on the 
DISPLAY: DISPLAY SETUP screen, the X and Y intercepts and gradients of 
selected line are also displayed in the plotting area.
To move marker to next VAR2 or next append curve
Select MARKER SKIP secondary softkey. Marker moves to next VAR2 step curve 
or next append curve every time you press MARKER SKIP.
To turn off the line intercept and gradient display
Select DISPLAY SETUP primary softkey, then set LINE PRMTRS secondary 
softkey to OFF.
To turn off the data variable display area
Use the following procedure:
1. Select DISPLAY SETUP primary softkey.
2. Set DATA VAR secondary softkey to OFF.
To move marker between two adjacent measurement points
See “To Specify between Measurement Points on Curve” on page 6-16.










