Power level is the power of the source at the test ports.
See other 'Setup Measurements' topics
The test port output power is specified over frequency.
See the Power Range specifications for your analyzer.
How to make Power settingsUse one of the following methods to set port power. |
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Using Hardkey/SoftTab/Softkey |
Using a mouse |
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This dialog provides basic control of source power for a specific port. See Power and Attenuators dialog box. Power On (All Channels) Check to enable source power for all channels. Only turns power ON if channel power setting is ON or Auto. Port 'n' Active source port for which power is being set. Port Power Sets the power level for the specified port. Power SweepStart / Stop Power Set the start and stop power values of a power sweep.
Power SlopeHelps compensate for cable and test fixture power losses at increased frequency. Slope Select to set the power slope. Clear to set power slope OFF. Learn more about power slope. |
How to make Power settingsUse one of the following methods to set port power. |
Using Hardkey/SoftTab/Softkey |
Detailed settings for Power and Attenuators:
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Defines and controls the source power and attenuation for the active channel. External sources can be controlled from this dialog. Learn more. Power On (All Channels) Check to enable source power for all channels (same function as RF Power). Only turns power ON if channel power setting is ON or Auto.
Name Lists the analyzer test ports. State
Port Power Sets the power level at the output of the source.
Start / Stop Power Available ONLY when sweep type is set to Power Sweep. Set the start and stop power values of a power sweep. Learn how to set Power Sweep.
Leveling Mode (ALC Hardware Softkey)- Refer to the following diagram:
Channel Power SlopeHelps compensate for cable and test fixture power losses at increased frequency. With power slope enabled, the port output power increases (enter positive value) or decreases (enter negative value) as the sweep frequency increases. Slope Select to set the power slope. Clear to set power slope OFF. Power slope is computed and applied from 0 GHz – not from the measurement start frequency. For example, with the following measurement settings:
The power into the DUT from 10 GHz to 20 GHz is 10 dBm sloping to 20 dBm Offset and Limits Launches the Power Offset and Limits dialog. Receiver Leveling Launches the Receiver Leveling dialog. Receiver Attenuator Launches the Receiver Attenuator dialog. |
When the power level that is required at a test port is higher than can be supplied, a Source Unleveled error message appears on the screen and the letters LVL appear on the status bar.
To resolve an unleveled condition, change either the Test Port Power or Attenuator setting.
Important Note: The available power range can also be adjusted AUTOMATICALLY by a Source Power Calibration, Guided Power Cal, or Power Compensation. If you are NOT seeing the range that you expect, or the correct power level at your DUT, view the Power Offset column in the Power Limits and Offsets dialog.
This dialog box is not avaiable in ENA. Receiver Attenuation is used to protect the VNA test port receivers from damage or compression.
CAUTION! You can damage the analyzer receivers if the power levels exceed the maximum values.
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Power ON and OFF during Save / Recall, User Preset, and Preset
To protect your DUT from being inadvertently powered ON, the following RF Power ON/OFF settings occur:
If power is OFF when an instrument state is saved, then power will always be OFF after the instrument state is recalled.
If power is ON when an instrument state is saved, and the current power setting is OFF, then power will be OFF after the instrument state is recalled.
Instrument Preset sets power ON by default.
This can be changed with a Preference setting so that, if the current power setting is OFF, then power will be OFF after Preset.
Power ON and OFF during Sweep and Retrace
Caution: Avoid expensive repairs to your analyzer. Read Electrostatic Discharge Protection.