- Hall effect card
- For use with Model 7001
The Keithley 7065 Hall Effect Card is intended for those who want to assemble their own economical Hall test systems. It also can form the foundation of a Hall Effect system. The sensitivity and capabilities of this card are unmatched by any other system or Hall Effect electronics package.
The 7065 is a signal conditioning card designed to buffer test signals from the Hall sample to the measurement instrumentation and to switch current from a source to the Hall sample. When used with Keithley's Model 7001 scanner mainframe, the 7065 provides the switching capability to measure Hall voltages as low as 50nV and sample resistances in excess of 1012W.
All the accessories needed to connect the sample holder, scanner, instruments, and controller are included, simplifying connections. The 7065 is connected directly to the sample, and all instruments are connected via the IEEE-488 bus to the controller. Examples of resistivity and Hall voltage measurement programs are included in the Model 7065 Instruction Manual.
The 7065 can be operated in either a low resistivity or a high resistivity mode. In the high resistivity mode, input impedance is greater than 100TW, input bias current is less than 150fA, and output resistance is less than 60W. Input voltage ranges in both operating modes is +8V to -8V. If higher voltage is desired, Keithley recommends using a 6220/6514 system. Cabling and sample connections must be carefully designed to make full use of the 7065's capabilities. Refer to Keithley's Low Level Measurements handbook for guidance in designing these connections.