Agilent Technologies E3631-90002, User Manual, Page: 141 / 166

Chapter 7 Tutorial
Overview of Agilent E3631A Operation
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In terms of performance, linear regulated supplies have a very precise
regulating properties and respond quickly to variations of the line and load.
Hence, their line and load regulation and transient recovery time are
superior to supplies using other regulation techniques. These supplies also
exhibit low ripple and noise, are tolerant of ambient temperature changes,
and with their circuit simplicity, have a high reliability.
The Agilent E3631A contains three linear regulated power supplies. Each is
controlled by a control circuit that provides voltages to program the outputs.
Each supply sends back to the control circuit voltages representing outputs
at the terminals. The control circuits receive information from the front
panel and send information to the display. Similarly the control circuits
“talk” to the remote interface for input and output with the GPIB and
RS-232 interfaces.
Figure 7-2. Block Diagram of the Three Supplies Showing The Optical Isolation
The control circuit and display circuit share the same common ground as the
±25V supplies. The remote interface is at earth ground and optically isolated
from the control circuit and the ±25V supplies. The +6V supply is also
optically isolated from the remote interface and the ±25V supplies.