Teledyne Lecroy WaveAce Lab 3 Manual de usuario

Teledyne LeCroy WaveAce Lab 3 –Making Measurements page | 1 of 8

WaveAce Lab 3: Making Measurements

Summary

This guide provides step by

step instructions explaining

how to use the WaveAce

Oscilloscope.

The WaveAce Oscilloscope provides tools for viewing, measuring and

analyzing digital, serial and analog waveforms. This guide will explain how

to use the various tools built-in to WaveAce such as cursors, waveform

magnifier, history mode, and remote control

Overview: The Measure Lab is addresses the use of cursors and

measure parameters found in modern digital oscilloscopes like the

WaveAce.

One of the major advantages of DSOs is their accurate measurement of

acquired data using cursors or standard parameters. A variety of cursors

are used with your WaveAce instrument. Also the WaveAce oscilloscope

offers three varieties of standard parameters —Voltage, Time and Delay.

This lab shows how these cursors and standard parameters can be easily

displayed to characterize pulses both vertically and horizontally.

Goal: Learn how to configure and use:

-Voltage cursors

-Time (Frequency) cursors

-Track cursors

-Standard measure parameters

In this Lab you will learn to use cursors and also to use standard measure

parameters for signal characterization.

Required Equipment:

- 1 x WaveAce Oscilloscope

- 1 x WaveAce passive probe

Setup: Connect the probe to Channel 2 and the probe top to the

calibrator (CAL) output loop on the front panel. Use the sprung hook

accessory of the probe to clip to the CAL output loop.

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Note:(Screenshots below show a white background configuration of your WaveAce to save black ink in

printing. This configuration is explained in Lab 2 –VIEW)

Measuring with Cursors

Cursors are important tools that aid you in measuring signal values. Cursors are markers (lines or cross-

hairs) that you can move around the grid or the waveform itself. Use cursors to make fast, accurate

measurements and to eliminate guesswork. There are three basic types:

• Voltage (Vertical) cursors are dashed lines that you move vertically on the grid to measure the voltage

levels of a signal. When used on a FFT waveform dBV values are measured.

• Time (Horizontal) cursors are dashed lines that you move horizontally on the grid to measure the time

values of a signal. When used on a FFT waveform frequency values are measured.

• Track (Horizontal) cursors are cross-hairs that you move horizontally along any channel waveform.

Place them at a desired locations along the time axis to read the signal’s voltage levels at the selected

times.

Step 1: Reset the scope configuration to the default factory settings using the front panel DEFAULT

SETUP button. An alternative method is to use the front panel SAVE/RECALL button, then press the

Type button until Factory is displayed and finally press the Load button.

At any time the menu on the right-hand side of the screen can be removed/restored by pressing the front

panel MENU ON/OFF button.

Step 2: Turn CH1 off and CH2 on by pressing the front panel CH1 and CH2 buttons. Pressing a

channel button also displays the corresponding vertical settings. DC coupling on CH2 is selected by

default. Check the slider switch on the probe is set to X10 and using the Probe button set 10X on the

screen.

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Step 3: Press the [blue] AUTO button on the front panel. In a few seconds you should have a triggered

signal with a number of cycles shown on the screen.

Step 4: Turn the Horizontal knob to adjust the Timebase. Fill the screen with a period of the signal.

Press RUN/STOP to stop the acquisition.

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Notes: Pressing RUN/STOP is used to stop the scope acquisition to allow measurement of the waveform

captured on screen.

The side menu can be turned off using the MENU ON/OFF button or by selecting a finite time for the

Menu Display in the DISPLAY menu.

Step 5: Turn on Cursors by pressing the CURSORS button. In the menu select Manual Mode. For Type

choose Voltage and for Source choose CH2. Select Cur A to use the Intensity/Adjust knob for adjusting

Cur A and select Cur B to use the Intensity/Adjust knob for adjusting Cur B.

Step 6: Position one cursor on top and the other to the bottom of the signal and measure the amplitude

of the signal

Notes: Vertical cursors are moved pixel by pixel up and down the grid. Both cursors use the same

source which can be any of the waveforms.

Here the difference in amplitude between the minimum and maximum levels of the square wave and the

individual voltage levels are shown in the top corner of the display.

Step 7: In the CURSOR menu change Type to Time. Select each cursor in turn and adjust to measure

one complete cycle of the waveform. Turn off the menu to see the second falling edge.

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Notes: Horizontal cursors are moved pixel by pixel across the grid. Both cursors use the same source

which can be any of the waveforms.

Here the difference in time between the start and end of the square wave, its inverse and the individual

times are shown in the top corner of the display.

The time reference (t=0) is the trigger point (indicated by the small red vertical arrow on the top line of

the screen).

Step 8: Press RUN/STOP to switch back to continuous triggering. Now select a timebase of 1us/div. In

the CURSOR menu change Mode to Track. Now two cross-hair cursors are displayed. Select each cursor

in turn and adjust to measure rising edge of the waveform.

Notes: Track cursors are moved to any point along the trace and can be used to measure time and

voltage. Each cursor can use CH1, CH2 or NONE as the source. Selecting NONE turns off the

corresponding cursor.

The Track Cursor is a cross-hair marker. When the cross-hairs are placed on a data point, they change

as the data changes. All time and voltage values are displayed in the top corner of the display.

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Step 9: In the CURSOR menu change Mode to Auto. For the moment nothing is displayed. This is

because in Auto mode the cursors operate in combination with a measurement parameters.

Change the timebase to 500us/div and press the MEASURE button.

To change any measurement press the corresponding button (in this case the top button).

Notes: Parameters are pre-programmed measurements that eliminate the need to set up cursors or

standardized measurements, like rise-time, fall-time, peak-peak amplitude etc. Use them to

automatically calculate many attributes of your channel waveforms. You can display up to five selected

parameter measurements on the side menu.

Either CH1 or CH2 can be used as the source for each of the Voltage and Time measurements. For

Delay measurements both channels are required and the source setting is ignored.

Remember to turn on the source channel(s).

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Now select the Voltage group, then Type and scroll to Mean. Leave the Source as CH2. In cases where

more than one trace is in use the source can changed if required. Because we previously selected cursor

mode as AUTO a cursor corresponding to the Mean value is displayed.

Press the front panel MEASURE button and your selected measurement is now shown (CH1 Vpp has

been replaced by CH2 Mean).

Teledyne LeCroy Corporation WaveAce Lab 3: Making Measurements page |8 of 8

Step 10: Sometimes more than five measurements are required. Complete measurement groups can be

displayed on the screen. In the second screenshot in Step 9 note there is a menu item called All Mea.

Press the corresponding button and then select the Voltage and Time groups.

Note: Measurements groups are displayed on the screen.

Either CH1 or CH2 can be used as the common source for all the Voltage and Time measurements. For

Delay measurements both channels are required and the source setting is ignored.

Remember to turn on the source channel(s).

Where the measurement cannot be calculated **** is displayed in place of the value

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