Instruction manual

4.3.1 A100 VOLTAGE CHANNEL SIGNAL FLOW
The Voltage and Current Modes provide both Internal or External Control. The
chosen signal is fed into the Voltage Preamplifier. The now inverted signal
flows to the error amplifier and compares it against the output voltage. The
error amplifier’s output drives the A200 PCB, providing the proper output
voltage.
4.3.2 A100 CURRENT CHANNEL SIGNAL FLOW
In the Current Mode, the input control signal is selected between Internal and
External. The signal then flows into the Current Preamplifier. From there the
now inverted signal is fed to the error amplifier, and the error amplifier drives
the A200 regulator. When current flows from the load to the shunt, a voltage
potential is produced across the shunt. The shunt voltage is amplified by a
different amplifier and fed back to the summing junction for closed loop control.
4.3.3 ±10VDC PRECISION REFERENCE
A precision voltage reference REF-01 with a temperature stability of 10 ppm is
used as the +10VDC reference. The -10VDC reference is produced by
anOP-07 inverting amplifier with a gain of -1.
4.3.4 ACTIVE LIMIT CIRCUITRY
The active voltage and current limits are sensed by amplifiers. A reference
voltage is fed into the amplifiers from the front panel settings and are compared
to the voltage output exceeds the setpoint, the comparator will decrease the
control signal from the output of the error amplifier, thus protecting the power
supply from overvoltage and overcurrent.
Page 16 of 24
83-469-001 Rev. B