with 44428A 16 Channel Actuator Output Card The Agilent / HP 3497A Series Data Acquisition/Control Unit Mainframe provides the interfacing, power supplies, and support structure for optional plug-in cards and assemblies. It is also the interfacing means between the 3498A Extender and a controller. Local control is accomplished by using the 3497A's standard front panel. This front panel has an alphanumeric keyboard for programming the scanner and a display for showing measurement results, status, etc. The front panel does not affect the remote control capabilities of the 3497A, and it also has an audible and programmable alarm (beeper). The 44428A consists of 16 mercury wetted form C (single pole-double throw) relays. Each relay can be individually closed and can switch 1A at 100V. The actuator assembly can be used to switch test fixture power or to actuate alarm bells. This flexibility of this assembly allows it to be used as a digital output or matrix switch.