American Magnetics 4Q06125PS-430 High Stability Integrated Power Supply System - Manual (Page 19)

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1 Introduction
1.1 Model 4Q06125PS-430 Integrated Power Supply System Fea-
tures
The AMI Model 4Q06125PS-430 High-Stability Power Supply System is a
sophisticated digitally-controlled power supply which allows an operator to
manage a superconducting magnet system with unprecedented accuracy
and ease of use. Integral components of the system include a Model 430
Programmer with zero flux current sensing system and Model 4Q06125PS
Power Supply. The AMI Model 4Q06125PS-430 Power Supply System
provides for a degree of flexibility and accuracy previously unavailable in
an economical commercial product.
1.1.1 Digitally-Controlled
The Power Supply System is controlled by a microcomputer-based control-
ler which controls all analog data conversion, display/keypad functions,
communications I/O, generation of analog programming signals for the
external power supply, and control law computations. The Power Supply
System incorporates digital signal processing (DSP) functions that provide
for accurate control, low drift, and flexibility of use.
1.1.2 Superior Resolution and Stability
The Model 430 Power Supply Programmer incorporates high-resolution
converters to translate signals between the analog and digital domains.
Precision instrumentation techniques and potentiometer-free designs are
employed throughout the Model 430 Programmer to ensure accurate sig-
nal translation for a wide range of conditions. The magnet current is sam-
pled at 24-bit resolution in hardware and is software-programmable to 15-
digits resolution. All pause and hold functions are performed in the digital
domain which provides for excellent stability and drift of the programmed
magnetic field.
For greater stability and accuracy, the Model 430 Programmer is config-
ured with a zero-flux precision current measuring device instead of the
standard resistive shunt. This option typically increases the system stabil-
ity and accuracy by an order of magnitude. The power supply systems
incorporating this technique are referred to as “high-stability” systems.
1.1.3 Intuitive Human-Interface Design
The Power Supply System was designed to simplify the interface where
possible. All functions were analyzed and subsequently programmed so
that the most commonly used functions are addressed with the least