User manual TEKTRONIX TDS 200

[. . . ] User Manual TDS 200-Series Digital Real-Time Oscilloscope 071-0398-03 This document supports firmware version FV:v1. 00 and above. www. tektronix. com Copyright © Tektronix, Inc. and foreign patents, issued and pending. Information in this publication supercedes that in all previously published material. Specifications and price change privileges reserved. [. . . ] To measure the amplitude, do these steps: 1. Push the CURSOR button to see the Cursor menu. Push the top menu box button to select Voltage. Use the CURSOR 1 knob to place a cursor on the highest peak of the ring. Use the CURSOR 2 knob to place a cursor on the lowest point of the ring. You can see the following measurements in the cursor menu: H The delta voltage (peak-to-peak voltage of the ringing) H The voltage at Cursor 1 H The voltage at Cursor 2 46 TDS 200-Series Digital Oscilloscope User Manual Application Examples Analyzing Signal Detail You have a noisy signal displayed on the oscilloscope and you need to know more about it. You suspect that the signal contains much more detail than you can now see in the display. Looking at a Noisy Signal The signal appears noisy and you suspect that noise is causing problems in your circuit. To better analyze the noise, do these steps: 1. Push the ACQUIRE button to see the Acquire menu. If necessary, push the DISPLAY button to see the Display menu. Use the Contrast Increase and Contrast Decrease menu box buttons to adjust the contrast to see the noise more easily. Peak detect emphasizes noise spikes and glitches in your signal, especially when the time base is set to a slow setting. TDS 200-Series Digital Oscilloscope User Manual 47 Application Examples Separating the Signal from Noise Now you want to analyze the signal shape and ignore the noise. To reduce random noise in the oscilloscope display, do these steps: 1. Push the ACQUIRE button to see the Acquire menu. Push the Averages menu box button to see the effects of varying the number of running averages on the waveform display. Averaging reduces random noise and makes it easier to see detail in a signal. In the example below, a ring shows on the rising and falling edges of the signal when the noise is removed. 48 TDS 200-Series Digital Oscilloscope User Manual Application Examples Capturing a Single-Shot Signal The reliability of a reed relay in a piece of equipment has been poor and you need to investigate the problem. You suspect that the relay contacts arc when the relay opens. The fastest you can open and close the relay is about once per minute so you need to capture the voltage across the relay as a single-shot acquisition. To set up for a single-shot acquisition, do these steps: 1. Adjust the vertical VOLTS/DIV and horizontal SEC/DIV to appropriate ranges for the signal you expect to see. Push the ACQUIRE button to see the Acquire menu. [. . . ] Persistence A method of retaining old data on the display for a period of time. TDS 200-Series Digital Oscilloscope User Manual 111 Glossary Pixel A visible point on the display. The display is 320 pixels wide by 240 pixels high. Pretrigger The portion of the waveform record that contains data acquired before the trigger event. Real-Time Digitizing A digitizing technique that samples the input signal with a sample frequency of at least four times the oscilloscope bandwidth. [. . . ]