Lab2_instrument_tutorial

Lab2_instrument_tutorial - LAB INSTRUMENT REFERENCE EEC180A...

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Unformatted text preview: LAB INSTRUMENT REFERENCE EEC180A Purpose: This document provides an introduction to the lab instruments found in the EEC180A lab. These instruments include the HP 54600B oscilloscope, the HP 6205B dual power supply, the HP 6237B triple output power supply, and the HP 3312A function generator. The goal of this reference tutorial is to introduce the basic function and operating procedures for these instruments to students with little lab experience. For more detailed operating instructions, the manufacturer’s operating manuals should be consulted. I. The HP 54600B Oscilloscope Figure 1. Measuring a DC voltage with the HP 54600B oscilloscope The 54600B oscilloscope has many different features and functions. We will only introduce a few of the most basic uses of this oscilloscope. The 54600B oscilloscope has two input channels which can be used for measuring signals. In Figure 1, a 10X probe is used to connect a DC voltage to channel 1. In order for the voltage scale, which is measured along the vertical axis, to be accurate, you must set the probe type. To set the Mode (RUN) Ch. 1 input Ch. 2 input Ch. 1 control Softkey to set Ch. 1 Probe type Trigger controls Trigger Mode (Auto) Mode Controls probe type for channel 1, press the “1” button, which is just below the Volts/div knob for channel 1. Next, check that the correct probe type is highlighted under the Probe setting on the screen. If the probe type is not set correctly, use the soft-key just below the Probe heading to toggle the selection to the correct choice. Figure 1 shows that the Probe type has been correctly set to 10. Measuring a DC signal Figure 1 shows the measurement of a +5V DC signal. Notice that the ground reference for channel 1 is set to center-line of the grid. (The channel 1 ground reference level can be adjusted using the Position knob just above the channel 1 input BNC jack.) In the upper-left hand corner of the display, you can see that the scope is set to 2V/div on channel 1. Since the signal trace is 2.5 divisions above the center-line, the DC voltage is (2.5 div)*(2V/div) = 5.0V. Notice in the upper-right corner that the Trigger MODE is set to Auto and the scope is in RUN mode. To measure a DC signal, the Trigger MODE must be set to Auto or Auto Lvl. To set the Trigger MODE, press the MODE button and then press the soft-key under the desired selection. Figure 2. Measuring a square wave with the HP 54600B oscilloscope Measuring a periodic signal Figure 2 shows the measurement of the scope’s 0-5V ‘calibration’ signal. The Time/Div knob is used to adjust the scale of the time axis, which is the horizontal axis on the Calibration signal 0-5V, ~1.2 kHz Time scale 200 us/div Time scale control Voltage scale 2V/div Ch. 1 voltage scale control Ch. 1 gnd reference display. In this example, the Time/Div knob has been set to 200 us/div, as indicated at the top of the display. Since the period of the signal is just slightly over 4 divisions, the period of the signal is about (200 us/div) * (4 div) = 800 us so the frequency is...
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This note was uploaded on 02/21/2012 for the course EEC 180A taught by Professor Redinbo during the Spring '08 term at UC Davis.

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Lab2_instrument_tutorial - LAB INSTRUMENT REFERENCE EEC180A...

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