Tektronix CSA8000B Series Manuale utente
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.
Copyright ETektronix, Inc.
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.
1
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.
2
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.
1
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.
2
Click a button to select among the
displayed views. Horizontal scale,
position, and other controls operate
on the selected time base view.
4
Mag View
Main View
Click the magnified time base button again
to remove that view from the display. (First
click selects; the second removes.)
5
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.)
3
Read the mask-hits
count in the readout.
5
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.)
6
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.
4
1
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
3
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.
3
Or completely set up the measurement
in the Meas setup dialog box. 4
5
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.
2
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.
3
4
Click to check the On box to display
the math waveform.
Result:
,,
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