ALC Bias Adjustment

This adjustment applies to the following models:

M9380A
M9381A
M9389A

The ALC Control loop in the PXIe signal generator uses PIN diodes as the level adjusting element. Within these diodes are logarithmic circuits that are adjusted by varying the bias voltages. This adjustment process computes the optimal bias voltages of these diode circuits and uses it to obtain the very fine ALC resolution.

Required Test Equipment

Test Equipment	Recommended Models¹
Power meter	N1914A
Power sensor	E9304A H20
50 W terminator For M9380A, M9381A 3 required	909D
Adapter, Type-N (f) to 3.5 mm (m)	1250-1750
100 MHz reference	M9300A

Refer to the main Required Equipment table for a list of alternative models.

Connections and Setup Procedures

Setup for Power Meter Calibration

Setup for ALC Bias Adjustment (M9380A, M9381A)

Setup for ALC Bias Adjustment (M9389A)