UNIVERSITY OF CALIFORNIA AT BERKELEY College of Engineering Department of Electrical Engineering and Computer Sciences EE105 Lab Experiments HP 4145B 4155A 4155C Parameter Analyzer Tutorial Contents 1 Introduction 1 2 The Hardware Interface 1 3 The Software Interface 1 4 Microsoft Excel 4 1 Introduction The HP 4145B 4155A 4155C is a parameter analyzer It can be used to apply test signals voltages or currents to one or more nodes of a circuit then measure the voltages and currents at other nodes in the 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 HP 4145B 4155A 4155C 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 HP 4145B 4155A 4155C 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 In order to actually hook up a circuit to the HP 4145B 4155A 4155C you ll need special cables provided by your TA These are extremely expensive 70 a piece so be careful not to break or lose them Build your circuit on the breadboard provided in lab then use the special cables to connect nodes in your circuit to SMU VS and VM terminals depending on the functionality you need at each node 1 3 2 THE SOFTWARE INTERFACE Figure 1 HP 16058 test fixture Figure 2 HP 16147 test fixture 3 The Software Interface Before using the software interface you must turn on the HP 4145B 4155A 4155C There is a power button in the lower left hand corner it may take 20 30 seconds for the machine to start The software to interface with the HP 4145B 4155A 4155C is only installed on half of the computers in the lab since there are two computers per lab station but only one set of lab equipment Generally the computer located closer to the HP 4145B 4155A 4155C the one to the left of the machine is the computer with the software Computers 3 THE SOFTWARE INTERFACE 3 that have the software installed are labeled Metrics Installed as well 1 Start ICS Metrics Click Start Programs Metrics ICS You may get an error but just click OK to ignore it 2 Click Instruments Select Instrument or the icon in Figure 3 You should see a list of Available instruments on the left side of the window Select the instrument that is installed at your lab station select HP4145 for the HP 4145 and HP4155 6 for the HP 4155A 4155C Click Connect and the device should be listed under Selected Click OK to exit this window Figure 3 Icon for selecting an instrument 3 Click Measure Edit Setup or the icon in Figure 4 to open the Setup Editor Click New to create a new setup and give it a name any name is fine Figure 4 Icon for setting up a measurement a You should now see a schematic of a MOSFET with blue squares at each terminal Click Device to pick a different device Note that the device shown is only to help you connect terminals It does not change anything other than the number of terminals available After selecting the device click OK If you picked a different device the schematic will change and the number of terminals will change b Now you must assign an SMU VM or VS to each of the terminals in the diagram This interface allows you to specify how the circuit is connected to the hardware interface Click Source Units A new window will come up with all of the SMU VM and VS terminals of the hardware interface available for you to select Click the source unit you want to assign then click on one of the terminals to assign that source unit to that terminal The schematic will change to show you which SMU VS or VM you ve assigned to which terminal c You can now assign stimuli and measurements to the terminals that you ve labeled For each terminal click on the icon next to the label and a new window will come up showing all of the available measurement and stimulus options For the VS and VM terminals you ll only be able to apply or measure a voltage respectively For SMU terminals you can choose to have either a voltage of current stimulus in the upper left hand corner You can choose to measure voltage or current in the upper middle of the window Finally you can select the actual values for the stimulus in the middle portion of the window Note If you want to measure the voltage at a terminal without applying a signal you can apply a current stimulus of amplitude zero which won t change your circuit d There are four primary ways you can set a stimulus current or voltage The first is just a constant value You won t be using this much since constant measurements are easy to do with a DC power supply and multimeter and don t require something as complex as the HP 4145B 4155A 4155C You can also set a node to common which is ground this is exactly equivalent to setting it to a constant value of 0V You ll always have one ground node in your circuit Finally the interesting options are stepping and sweeping values Stepping a value causes a measurement to occur at every voltage you select You can set a starting voltage a stopping voltage and how many points you want to test 4 4 MICROSOFT EXCEL Sweeping a value causes a measurement sweep to occur …
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