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Unformatted text preview: Agilent4155C/HP4145B Parameter Analyzer Tutorial Contents 1 Introduction 1 2 The Hardware Interface 1 3 The Software Interface 2 4 Microsoft Excel 4 1 Introduction The Agilent4155C/HP4145B is a parameter analyzer. It can apply test signals (voltages or currents) to one or more nodes of a circuit and then measure the voltages and currents at other nodes in the same circuit. What makes the parameter analyzer particularly useful is that it can sweep a test voltage across hundreds of values in a matter of seconds. You can think of its capabilities like those of a DC analysis in SPICE. 2 The Hardware Interface The hardware interface to the Agilent4155C/HP4145B is a metallic box (called a test fixture) located at every lab station. Inside the test fixture, you’ll notice a socket, many numbered slots, and eight labeled terminals: 4 SMU, 2 VS, and 2 VM (newer models have more terminals, but all models have at least these eight). The SMU is the most flexible terminal: it can be used to apply or measure a current or a voltage. The VS can act only as a voltage source, and the VM can act only as a voltmeter. For any measurement you’re conducting having fewer than five nodes, you should use the SMU terminals for all of the nodes since they provide the most functionality. Figure 1 shows the old test fixture and Figure 2 shows the new test fixture. SMU terminals are labeled with red, VS with blue, VM with black, and ground with green. Note that the HP 16147 test fixture has two numbering schemes for the SMU terminals—use the the numbering scheme with black numbers on a white background (as labeled in Figure 2). When using the Agilent4155C/HP4145B, you can either connect a pin to the ground terminal in the test fixture or you can connect it to an SMU or VS and set the SMU/VS to supply 0V. According to the test fixture documentation, the ground terminals are just connected to the chassis of the test fixture, so using the ground terminal can mean a noisy ground. For best results (in particular with small signals or sensitive circuitry), you should use an SMU or VS for ground. Build your circuit on the breadboard, then use the special cables to connect nodes in your circuit to the SMU, VS, and VM terminals....
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- Spring '08