One characteristic of a typical rectifier unit is that it _________.

A typical rectifier unit is designed to convert alternating current (AC) to direct current (DC), which is crucial for many applications, including corrosion control in pipelines. One of the key characteristics of these units is that they usually have adjustable output voltage. This feature allows operators to fine-tune the voltage levels to meet specific requirements for the cathodic protection system in use.

By adjusting the output voltage, the rectifier can compensate for changes in the system, such as varying loads due to temperature changes or other environmental factors, ensuring optimal performance and adequate protection against corrosion. This flexibility enhances the ability to manage the cathodic protection effectively, making it a vital aspect of maintaining system integrity.

Other features, like having an ammeter and voltmeter, while helpful for monitoring the unit's performance, do not define the rectifier's primary function as effectively as the adjustable output voltage does.