Goals of the Laboratory Exercise The oscilloscope is the premier instrument in m
ID: 1998464 • Letter: G
Question
Goals of the Laboratory Exercise The oscilloscope is the premier instrument in measuring time ng voltages. While the DMMcan measure DC voltages very well, the oscilloscope provides a picture of the voltage as it changes with time. The function generator generates voltages that change with time, the most common being sine, square, and triangle signals. mis collection of exercises isintended to get you started on some of the basics of operating oscilloscopes and generators. Procedure In these instructions, it is virtually impossible to describe the detailed operation ofall function generators and oscilloscopes m Most share common attributes and here we concentrate on the most hasic which are common to all units. 1. General use of and function generator. oscilloscope Virtually all oscilloscopes and function generators use BNC oonnectors. Familiarize yourself with the use of these by connecting and disconnecting BNC leads using a pushtwist and twist/pull motion. Note that there are a variety of BNC leads available in the lab. Three possible types are BNC to BNC,BNC to alligator and BNC to probe. Connectthe output off the function generatortotheChannel 1 input of the oscilloscope using BNC to BNC cable. Connectthe SYNC output ofthe function generator to EXTINPUT of the oscilloscope using a BNC to BNC cable. Select "External trigger" on the oscilloscope. The operating of the oscilloscope may appear somewhat complicated to the beginner, but there are only a few controls that are initially important and with practice you will become very familiar with its operation. While every oscilloscope is different, in general, begin by tuming on the oscilloscope and setting the following controls, which are somewhat lessimportant to the readings, as follows: a) Set the trigger channel to CH 1 or to the Channel which the input is connected. b) Set the SYNCH switch to AC. c) Set or trigger switch to
Explanation / Answer
(A) No,changing the volt/div knob does not change voltage input. It changes the range of voltage to be displayed by 1 division.reducing v/d knob will give bigger waveform,therefore increasing displayed height of waveform.this does not affect the actual waveform/input. Its just zoomed version of actual waveform.
(B) Vpp is equal to volts/div * vertical height of the waveform.
(C) The error is minimized when the volts/div are reduced to an extent,1 complete cycle is observed in Oscilloscope' screen.This way you can read voltage with higher accuracy.
(D) Similarly,changing the time/div knob will not change the time period of wave.It changes the no. of waves(complete cycle (0 to 2)) that can be accommodated in screen of oscilloscope.
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