Measurement
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2. Press DC Monitor Setup > DC Monitor > ON, to turn ON the DC
monitoring feature.
Monitoring the DC Bias Level with Trace
You can monitor the actual dc bias level (either voltage or amperage) at
the each point when dc bias sweep is selected.
1. Press Sweep Setup > Sweep Type > DC Bias or Log DC Bias to setup
type to DC Bias sweep setting.
2. Press Meas > DC Monitor Setup > DC Monitor Trace > Vdc - Idc to turn
ON the DC monitoring trace feature. The traces 3 and 4 are
displayed and assigned to Vdc and Idc respectively.
Vdc and Idc can be assigned for traces 1 and 2 by
pressing Meas > Trace 1, Trace 2.
1. Press DC Monitor Setup > DC Monitor Trace > Close to turn OFF the
DC monitoring trace feature.
Setting for Phase
• Selecting the Phase Unit
• Displaying Phase Values without Wrapping at ±180 degree
Other topics about Setting Up the Display of Measurement Results
Selecting the Phase Unit
When you are performing phase-based measurement, you can specify
whether to use degrees or radian as the phase unit applied to the scaling
and marker features.
1. Activate the trace for which you want to set the phase unit.
To set the phase unit, your parameter must be either |Z|-
θ/|Y|-θ or COMPLEX Z-Y. You should activate Trace 2 in the former
case, and the trace whose axis format is polar in the latter case.
2. Press the Format key to display the Format menu.
3. Press Phase Unit > Deg|Rad to select your desired phase unit.
Displaying Phase Values without Wrapping at ±180 degree
The E4990A provides a feature that allows you to display phase values
without wrapping them at +180° or -180°. This feature, called “expanded
phase,” is useful when measured phase values are in a continuous increase
or decrease and some of them exceed +180° or -180°. To set up the
expanded phase feature, follow these steps:
1. Activate the trace for which you want to use the expanded phase
feature.
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