Amplifier Research 75A250A Manual - Halaman 13

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Model 75A250A

3.4

A4 OPERATE/CONTROL BOARD (SCHEMATIC DIAGRAM No. 1008597)

The A4 Operate/Control Board is a microcontroller-based printed wiring board (PWB) assembly that

allows sensing and control of internal signals as well as remote personal computer (PC) control via on-

board RS-232 and IEEE-488 data communications ports. The A4 Operate/Control Board utilizes a state-

of-the-art, Reduced Instruction Set Computing (RISC) microcontroller that can quickly and reliably

perform all front panel control and monitoring tasks, thereby allowing real-time control to the Model

75A250A via either remote bus. Besides being reported remotely, all amplifier faults are continuously

monitored and indicated via the unit's front panel VFD.

3.5

A3 GAIN CONTROL (SCHEMATIC DIAGRAM N

The gain control allows for gain adjustment either from the front panel or from the RS-232 Port or the

IEEE-488 Port. U4 and U5 are 2 electronic attenuators connected in series to give a minimum adjustment

range of 18 dB. U1 is a switch that selects front panel control or remote control.

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Manual Text

3-2

REV A