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Testforce CanadaModel 648 Electromagnet Power Supply
Model 648 features
- Bipolar, linear, 4-quadrant output
- ±135 A/±75 V, 9.1 kW
- Low noise
- 1 mA of programmed current resolution
- Built-in fault protection
The Model 648 electromagnet power supply is a robust, fault-tolerant 9-kW supply optimized for powering large 7- or 10-in research electromagnets. It is specifically designed for high precision laboratory use requiring extremely low electrical noise. The linear design removes undesirable higher frequency noise typical of switch mode power supplies. Eliminating the need for external switching or operator intervention to reverse current polarity, the Model 648 uses convenient bipolar, 4-quadrant operation. It is capable of supplying ±135 A/±75 V to a nominal 0.5 Ω, 0.5 H load. The Model 648 is built to last with a rugged design, integrated fault protection, and a simple, clean interior electronic design.
This power supply is developed to minimize downtime. It uses worry-free water cooling for quiet efficient operation compared to air-cooled power supplies. The seamless water lines only have external junctions, eliminating internal water leaks. In addition, safety interlocks ensure that cooling water is always flowing to the supply while operating. Magnet water can also be interlocked into the power supply if desired. Internal software controls manage water usage intelligently.
When combined with a Lake Shore EM-7V 7-in electromagnet and Model 475 DSP gaussmeter, the Model 648 forms a versatile electromagnet characterization system ideal for a wide range of user defined applications, including magneto-optical studies, magnetic hysteresis tests, susceptibility measurements, Hall effect studies, spin magnetic resonance demonstrations, and biological tests.
Output architecture
The low electrical noise design of the Model 648 makes it the ideal power supply for use with large electromagnets in high-precision laboratory settings, ensuring greater resolution and finer detail in data taken during highly sensitive measurements. Since low noise is critical to measurement systems, the Model 648 implements both a linear design and bipolar architecture. Linear magnet power supplies have several advantages over switch mode power supplies, primarily smooth field generation that is nearly free from offending electromagnetic signatures. The bipolar, 4-quadrant operation required to safely operate an inductive load provides clean transitions through zero without discontinuities.
Output programming
The Model 648 output current is programmed internally via the keypad or the computer interface, externally by analog programming input, or by the sum of the external and internal settings. External programming via analog input signal provides analog resolution. The Model 648 generates extremely smooth and continuous ramps—the digitally generated constant current ramp rate is variable between 0.1 mA/s and 50.000 A/s. To ensure a smooth ramp rate, the power supply updates the high-resolution DAC 12.3 times per second.
Output reading
The Model 648 provides high-resolution output current readings that reflect the actual current in the magnet and have a resolution of 1 mA. The output voltage reading reports the voltage at the output terminals with a resolution of 1 mV. All output readings can be prominently displayed on the front panel and read over the computer interface.
For more information, including specifications, charts, and other details, visit the product page on the Lake Shore website.
