|4290RevA_DocSpec.pdf||Model 4290 Calibration System Specifications
The Model 4290 Calibration System was specifically designed to facilitate calibration and verification of the Keithley Model 4200
Semiconductor Characterization System. In general terms, the Model 4290 is a collection of calibration resistors whose values are known
precisely. The resistors are characterized (measured precisely) prior to calibration and verification of the 4200-SCS. After characterization, the
calibration resistors are used in conjunction with a precision voltmeter to accurately measure currents ranging from 10-15 amps to 1 amp.
The Model 4290 is comprised of a Keithley Model 2002 Digital Multi-Meter, Keithley Model 708A Switching Matrix, and Keithley Model 7177
Reference Card (containing the calibration resistors). The Model 4290 can be configured for multi-channel operation by adding Model 708As
and Model 7177s. Each channel consists of a 708A / 7177 pair and is referred to as a System Reference Unit (SRU). So|