If automatic leveling control (ALC) is enabled, the ALC is closed, also known as closed-loop mode. The main purpose of the closed loop is to provide greater amplitude accuracy across the whole frequency range, from 250 kHz to 20 GHz. When the ALC is closed, the digital-to-analog converter (DAC) becomes the master reference for output power, which provides greater accuracy. However, the step attenuator hinders the PXIe-5654 RF Analog Signal Generator switching speed when the ALC is closed.

If the ALC is disabled, the ALC is open, also known as open-loop mode. Open-loop mode is ideal for utilizing modulation capabilities.

You can configure the ALC connection between the PXIe-5654 and PXIe-5696 Amplitude Extender using the default hardware configuration.

Note  Refer to the PXIe-5654 Specifications document for PXIe-5654 switching speed values.

Related Topics

Connecting to the PXIe-5654

Power Level Adjustment