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The HP 4145A Semiconductor Parameter Analyzer is a stand-alone instrument capable of complete dc characterization of semiconductor devices and materials. It stimulates voltage and current sensitive devices, measures the resulting current and voltage responses, and displays the results in a user-selectable format (graph, list, matrix or schmoo) on a built-in CRT display. An on-board programmable calculator provides real-time calculation of voltage/current dependent parameters, such as the current gain (h FE) and transconductance(gm) of transistors, which also can be displayed on the CRT. A number of powerful graphic analysis tools-marker, cursor, line function , interpolation-enhance the HP 4145A's basic capabilities and provide fast , accurate analysis of semiconductor devices, leading to increased production yields and improved device quality. Four built-in stimulus/measurement units (SMUs) are the heart of the HP 4145A. Each SMU can be independently programmed to function as either a voltage source/ current monitor or a current source/ voltage monitor. Thus, a bipolar transistor, for example, can be completely characterized in common-base, common-emitter, and common-collector configurations without changing connections, only changing the SMUs' operating modes is required. The HP 4145A is also equipped with two voltage sources and two voltage monitors for measurements on devices having more than four terminals, such as ICs. SMU .Voltage/Current Compliance; Maximum voltage compliance: 20 V, 40 V, or 100 V, depending on the output current range. Maximum current compliance: 20 rnA, 50 rnA, or 100 rnA, depending on the output voltage range. Compliance setting resolution: same as current and voltage output/measurement resolution. Maximum current compliance resolution, however, is 50 pA. Compliance accuracy: voltage compliance accuracy is the same as voltage output/measurement accuracy. Current compliance accuracy is current output/measurement accuracy ± (1 % of range + 10 pA. Voltage Sources (Vs) Characteristics; Number of sources: two. Output resistance: <=0.2 ohm. Maximum capacitive load: 1000 pF. Display: CRT size and screen resolution 152.4 mm (6 inch) diagonal; 2048 x 2048 points. Display modes: Graphics, Schmoo, List, Matrix, and Time Domain.
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