Amplifier Research 100A250 series Manual - Página 13

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Model 100A250A

3.4

POWER SUPPLY

Refer to "Schematic Diagram Number 1010659, Power Supply".

Input AC power is fed through RFI Filter FL1 before being switched by the circuit breaker CB1. The AC input

power is fed from CB1 to the three switching power supplies, PS1, PS2, PS3.

The three switching supplies work on line voltages of 90 to 132 VAC and 180 to 264 VAC 50/60 Hz. The input

voltage is selected automatically to conform to the supplied line voltage. No manual changes are required when

switching from one supply voltage to another.

The outputs of PS1 and PS2 are connected in series to supply 30 VDC to the amplifier circuits. The output of PS3

supplies ±12VDC and +5VDC to the operate/control circuits and the gain control circuit. All the supplies have

current limited outputs to protect them from shorts or over dissipation.

The 30VDC is fed through L1, which keeps switching transients from the supplies out of the amplifier circuits, to

the amplifier circuits.

If the currents in the output amplifiers get too high for the on board circuits to control, or if the heat sink

temperature gets too high, a fault signal is generated to shut down PS1 and PS2.

3.5

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 100A250A 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 NO 1009914)

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.

Manual Text

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