Keysight E4990A - Page 100

E4990A Help
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a. The unit specified for oscillator level through the steps above will be
applied to the unit for oscillator level sweep (voltage level sweep or current
level sweep) and the unit for the fixed oscillator level when sweeping
parameters other than oscillator level. The setting for the unit will not
affect the setting for the signal source level monitoring function, since the
function displays both voltage and current levels.
b. Settings of the unit for oscillator level are commonly applied to
both traces. Hence, you do not need to select and verify an
active trace before setting.
Setting Oscillator Level
1. Press Sweep Setup > OSC Level to display the oscillator level settings
menu.
2. The Voltage Level or Current Level is enabled depending on your
oscillator selection. For example, if you have selected OSC Unit >
Voltage, then Voltage Level is enabled. then, press the Voltage Level
and input the desired voltage level value.
Controlling Oscillator Level (ALC)
1. Press Sweep Setup > OSC Level > ALC to display the ALC level
settings menu.
2. Press ALC > ON|OFF to toggle between On or Off the ALC level.
3. Press Max Iteration and input the desired maximum iteration value,
between 2 and 10.
4. Press Target % and input the desired value, between 0.05 to 10.
Setting and Applying dc Bias
Follow the steps below to apply dc bias to DUT, regardless of whether you
plan to sweep by dc bias.
Selecting dc bias mode
1. Press Sweep Setup > DC Bias > DC Bias Mode to display the DC bias
mode selection options.
2. Select one of the DC bias mode, either Voltage or Current.
Selecting constant mode
1. Press Sweep Setup.
2. Press DC Bias > Constant Mode and toggle between the ON|OFF
selection to turn ON/OFF the constant mode.
Setting fixed dc bias level
When the sweep parameter is not dc bias, select the dc bias mode and
then follow the steps below to set dc bias level.
1. Press Sweep Setup > DC Bias to display the DC bias selection options.