Transient operation enables the module to periodically switch between two load levels, as might be required for testing power supplies. Transient operation can be turned on and off from the front panel (shift + numeric key ”2”). Before turning on the operation, the customer should set the parameters associated with the transient operation. The parameters include A-level, B-level, frequency, duty cycle, and transient testing modes. There are three different transient testing modes: continuous, pulse, and toggle.