Tektronix CSA8000B Series Manuel utilisateur

Reference

CSA8000B Communications Signal Analyzer

TDS8000B Digital Sampling Oscilloscope

071-1096-01

*P071109601*

071109601

Click a measurement icon to

take a measurement of the

currently selected waveform.

To Use the Screen Controls

Use the mouse to select waveforms, menus, and buttons. You can also

drag with the mouse where indicated below.

Drag the horizontal reference to move

the point around which horizontal scaling

expands and contracts the waveforms.

Drag across a waveform segment

and click the Zoom button to expand

the selected waveform segment

horizontally to full-screen width.

HRight click on display items and readouts to find set-up

shortcuts and additional options.

HUse the touch screen to make selections if a mouse is not

available. Push the front-panel TOUCH SCREEN button to toggle

the touch screen on and off.

HWhen using the touch screen, you can use your finger or the

touch-screen stylus that shipped with the product.

Other Navigation Tips:

Drag the zero-reference indicator

to add offset to a waveform.

Drag waveform icon vertically to

position the waveform vertically.

Push a MENU button to

access the setup dialog box

for that control group.

To Access the Setup Dialog Boxes

Click the Setups icon to access

the setup dialog boxes with the

one last active selected.

Access any setup dialog

box from the Setup menu.

Push the SETUP DIALOGS

buttontoaccessthelast

active setup dialog box.

Click on the tabs to

select among the

setup dialog boxes.

To Display a Communication Signal

Carefully install the sampling module in the

instrument.

Note. After installing a sampling module(s) or

after moving the module from one compartment

to another, run compensation (Utilities menu) to

ensure the instrument meets its specifications.

See your user manual for more information.

CAUTION. To prevent damage, make sure instrument power is turned off before

installing sampling modules. To help prevent damage from ESD, always attach

and use the wrist strap while making any electrical signal connections.

Trigger

Communication signal

Select the communication

standard. 4

Click Autoset in the Mask setup

dialog box or on the front panel. 5

Select the channel that you want to

display in the Mask setup dialog box. 3

HInstall up to two optical modules into the large-module compartments. These

optical inputs become channel 1 and channel 2. If an optical module is

installed, the channel 1 and 2 small-module compartment is disabled.

HUse the Optical Clock Recovery option to obtain a stable trigger from an optical

data signal when using optical sampling modules that support clock recovery.

To Display Optical Signals:

Connect signals to your

sampling module.

To See More Waveform Detail

Drag across the segment of the waveform

that you want to see in greater detail. 1

Click these buttons to add one or

two magnified time base views.

Click the Zoom button. 2

To Add Magnified Views

Drag the brackets in the main time

base to specify the position and scale

for the magnified view.

Click a button to select among the

displayed views. Horizontal scale,

position, and other controls operate

on the selected time base view.

Mag View

Main View

Click the magnified time base button again

to remove that view from the display. (First

click selects; the second removes.)

See the waveform reacquired with

increased horizontal resolution. 3

Drag the boundary between two

graticules to resize the graticules. 3

To Analyze Communication Signals

If you want, disable mask counts.

(Selecting a mask in step 2

automatically enabled them.)

Read the mask-hits

count in the readout.

Specify a stop condition in the Acquisition

setup dialog box, and then specify an action

to take place when acquisition stops. (You

can set counts for the Mask Hits condition

here also.)

Use Mask Testing

Use FrameScanR

Use built-in masks to test to one of the com--

munication standards, or design your own mask.

Use FrameScan to test a specific bit (or

range of bits) in a repeating frame of data.

You set up FrameScan from the Horizontal

Setup Dialog box. See the instrument user

manual for more information.

Frame sync pulse

Repeating data stream

Set the start bit and the number of bits

within the frame that you want to analyze

in the Horizontal setup dialog box.

Select a standard mask in the Mask setup

dialog box. 2

If you want, you can enable margins

to explore design margins of your

communications signal.

Select a channel to mask test.

To Take Measurements With Cursors

Push the CURSORS buttontoturnonthecursors

to measure the currently selected waveform. 1

You can also drag each cursor to

place it relative to the waveform. 5

Cursor

readouts

HYou can assign each cursor to a different waveform to take

measurements between waveforms. Make these selections in the Cursor

setup dialog box.

HIf you use two magnified time base views, you can take precision timing

measurements between two distant points on a waveform. Magnify each

point of interest in a separate time base, and then place one cursor on

each point. The ∆-time cursor readout will then reflect the position and

resolution of the magnified time bases.

Other Cursor Measurement Tips:

Click this button to toggle the

cursor readouts on and off. 6

Push the CURSORS button repeatedly to

toggle between cursor type: Vertical Bars,

Horizontal Bars, Waveform, and Off. 2

Push the SELECT button to toggle selection of

the active (adjustable) cursor between the pair.

Position the active cursor with the General

Purpose knob. 4

Amplitude Area Timing

AC RMS Cycle Mean Eye Open-

ing Factor

Mid Q Factor Suppression

Ratio (dB)

Area Bit Rate Delay Frequency +Width

Amplitude Cycle RMS Gain Min RMS OMA Area Cycle Bit Time + Duty Cycle Period -- Width

Avg. Optical

Power (dBm)

Extinction

Ratio

High + Overshoot RMS Noise Burst Width -- Duty Cycle Phase

Avg. Optical

Power (watts)

Extinction

Ratio (%)

Low -- Overshoot Signal-to-

Noise Ratio

+Cross Duty Cycle

Distortion

Pk-Pk Jitter

Crossing % Extinction

Ratio (dB)

Max Pk-Pk Suppression

Ratio

-- Cross Eye Width Rise Time

Crossing

Level

Eye Height Mean Pk-Pk Noise Suppression

Ratio (%)

Crossing

Time

Fall Time RMS Jitter

Note: All measurements are accessible from the Meas Setup dialog box. Some measurements are not accessible from the Meas.Toolbar attop of the display.

To Take Automatic Measurements

Select the measurement signal type. 1

Click a measurement button to take

the measurement on the currently

selected waveform.

Or completely set up the measurement

in the Meas setup dialog box. 4

Read the measurement results

in the readouts.

The dialog box readout displays

results with full resolution.

Automatic Measurement Choices

Select the measurement category. 2

Select Region tab and turn on gates

to isolate the measurement to a

specific part of the waveform.

To Customize an Automatic Measurement

Select the RefLevel tab and adjust the

measurement reference levels to different

relative or different absolute values. You can

also select AOP, to have the instrument

measure and use the Average Optical

Power level of the signal as a reference

level (useful for OMA measurements).

Select Annotations to see where

the measurement is being taken

on the waveform.

Select the HiLow tab and choose a

method for determining reference levels.

Select Statistics to see accumulated

statistics as the measurement is

being performed.

To Use Math Waveforms

Math expressions can combine waveforms with

measurement results, as shown in this example

(C1 minus the mean value of C1).

Click the f

xbutton to display the

Define Math dialog box. 1

Select the math waveform you want to define. 2

Define Meas1 as the Mean value of

C1 in the Meas setup dialog box. 1

Enter this sequence in the Define

Math dialog box to build the math

waveform expression.

A Math Waveform Example

Use the controls in the Define Math dialog

box to define the math expression. Build

the waveform expression using sources,

operators, constants, and functions.

Click to check the On box to display

the math waveform.

Result:

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