Tektronix MDO4000C Series Oscilloscopes Demonstration Guide 071-3472-00

Tektronix MDO4000C Series Oscilloscopes Demonstration Guide 071-3472-00
Tektronix MDO4000C Series Oscilloscopes
Demonstration Guide
071-3472-00
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Tektronix MDO4000C Series Oscilloscope
Demonstration Guide
Table of Contents
Tektronix MDO4000C Series Mixed Domain
Oscilloscope.................................................................... 4
Exercise 5: Generating Waveforms with the
Integrated AFG................................................................ 34
About This Guide............................................................. 6
Exercise 6: Measuring Signals with the Integrated
DVM / Frequency Counter............................................... 38
Powering on the Board................................................... 8
MDO4000C Series Front Panel Overview....................... 9
Exercise 7: Fast and Accurate Spectral Analysis
with Integrated Spectrum Analyzer.................................. 41
Exercise 1: Capturing Elusive Events with
FastAcq™ High Waveform Capture Rate.......................... 10
Exercise 8: Mixed Domain Analysis: Viewing
Complete System Activity................................................ 50
Exercise 2: Wave Inspector® Navigation and
Automated Search........................................................... 15
Exercise 9: Quickly Characterize Time-Varying
RF Events........................................................................ 54
Exercise 3: Decoding, Triggering and Searching
Serial Buses.................................................................... 20
Exercise 10: Capturing Wideband Signals...................... 58
Exercise 4: Acquiring Analog and Digital signals
of a D/A Converter........................................................... 30
Locating Signals on Demo Board................................. 62
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Tektronix MDO4000C Series Oscilloscope
Demonstration Guide
Tektronix MDO4000C Series
Mixed Domain Oscilloscope
Mixed Domain Oscilloscope delivers high performance
for validating and debugging challenging designs. These
integrated 6-in-1 oscilloscopes offer a spectrum analyzer,
arbitrary function generator (AFG), logic analyzer, protocol
analyzer, and digital voltmeter (DVM) to provide system-level
insight as well as versatility.
Oscilloscope – At the core of the MDO4000 Series is the
most popular oscilloscope in this class.
200, 350, 500 MHz, and 1 GHz bandwidth models
Up to 5 GS/s sampling rate
20 Mpoint record length on every channel with Wave
Inspector® navigation and search controls
Maximum waveform capture rate up to >340,000
waveforms per second
Standard passive probes with 3.9 pF of capacitive loading
and 1 GHz or 500 MHz bandwidth
Suite of advanced triggers including optional serial
triggering and analysis
Additional application support includes automated
power analysis, limit and mask testing, and advanced
video analysis
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Tektronix MDO4000C Series Oscilloscope
Demonstration Guide
Spectrum Analyzer (Optional)
Protocol Analyzer (Optional)
Every MDO4000C can be equipped with an integrated
spectrum analyzer, providing better RF performance than a
traditional oscilloscope FFT, and synchronized displays of
analog, digital, and RF signals. The spectrum analyzer has an
ultra-wide capture bandwidth ≥1 GHz and input frequency
ranges from 9 kHz to 3 GHz or 6 GHz with the SA3 and SA6
options, respectively.
The MDO4000C Series offers a robust set of tools for
debugging serial buses with automatic trigger, decode, and
search for I2C, SPI, CAN, LIN, FlexRay, RS-232, RS-422,
RS-485, UART, I2S/LJ/RJ/TDM, USB 2.0, MIL-STD 1553,
and Ethernet.
Arbitrary Function Generator (Optional)
With the MDO4AFG option, choose from 13 predefined
standard waveforms like sine, square or ramp, or replicate
virtually any signal with the arbitrary waveform generation with
128k record length and 250MS/s sample rate. Even add noise
to your waveform to perform margin testing on your circuits.
Logic Analyzer (Optional)
The MDO4000C provides a 16 digital channel logic analyzer
with the MDO4MSO option, enabling you to look at multiple
points in your design at once.
Digital Voltmeter (DVM) / Frequency Counter
(Free with product registration)
For fast voltage and frequency measurements, the optional
4-digit digital voltmeter and 5-digit frequency counter is easyto-use.
Upgradability
The MDO4000C is completely upgradeable. Upgrade scope
bandwidth, add more functionality with a spectrum analyzer,
AFG, logic analyzer, and DVM, or add analysis capability such
as serial bus triggering and decode, power measurement,
limit/mask test, and advanced video analysis, whenever you
need it.
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Tektronix MDO4000C Series Oscilloscope
Demonstration Guide
About This Guide
This demonstration guide takes you through a series of
step-by-step demonstrations on how the MDO4000C Series
oscilloscope helps simplify the debug of mixed signal designs
with its powerful functionality and integrated test instruments.
This oscilloscope can help you discover new ways to quickly
debug some of today’s most challenging and common
design problems.
Note: There are additional built-in product demos in
MDO4000C. To explore other product demos and
features, press the Utility front panel button, then press
the MDO4000C Utility Page lower-bezel button, and use
Multipurpose a to select Demo.
To go through the exercises, you need:
MDO4000C Series Mixed Domain Oscilloscope and
power cord.
Four (4) TPP1000 or TPP0500B passive probes.
MDO demonstration board (includes a USB Y-cable used
to power the demo board) with waveforms that represent
a number of mixed-signal challenges facing today’s
designers. To find the desired signal on the demo board,
refer to the “Locating Signals” section at the end of this
demonstration guide.
N-BNC adapter to connect BNC cable to RF input channel
(standard accessory).
BNC cable to connect AFG output to analog channel and
to connect to the spectrum analyzer input.
Serial bus triggering and analysis application modules.
MSO, DVM, AFG, Spectrum Analyzer options.
Note: For demonstration purpose, many application modules
and options are enabled in MDO4000C demo units. They are
listed on the following page:
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Tektronix MDO4000C Series Oscilloscope
Demonstration Guide
Category
Serial Bus
Analysis
Analysis
Measurement
Instrument
Options
Product
Description
DPO4AERO
MIL-STD-1553 serial bus triggering and analysis module
DPO4AUDIO
Audio serial triggering and analysis module (I2S, LJ, RJ, TDM)
DPO4AUTO
Automotive serial triggering and analysis module (CAN, LIN)
DPO4COMP
Computer serial triggering and analysis module (RS-232/422/485/UART)
DPO4EMBD
Embedded serial triggering and analysis module (I2C, SPI)
DPO4ENET
Ethernet serial triggering and analysis module
DPO4USB
USB2.0 (LS, FS) serial bus triggering and analysis and (HS – 1GHz models only)
analysis module
DPO4LMT
Limit/mask test
DPO4PWR
Power measurement and analysis package
DPO4VID
Advanced Video Analysis
N/A
Adds digital voltmeter to any MDO4000C, free with product registration
MDO4AFG
Adds arbitrary function generator to any MDO4000C
MDO4MSO
Adds 16 digital channels to a MDO4000C; includes P6616 digital probe and
accessories
MDO4SA6
Adds spectrum analyzer with 9kHz - 6 GHz input frequency range
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Tektronix MDO4000C Series Oscilloscope
Demonstration Guide
Powering on the Board
To connect and power on the
demonstration board, follow
these steps:
1. Plug the dual USB A connectors from
one end of the “Y” USB cable, which
comes with your board, into two USB
ports of a PC or an oscilloscope. Do
this before plugging the single USB B
connector from the other end of the USB
cable into the demonstration board. You
need to attach both USB A connectors
to provide adequate power to the demo
board.
2. Plug the single B connector from the
other end of the USB cable into the
demo board. Two green and one red
LEDs on the board turn on and remain
steady when you apply adequate power
to the board.
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Figure 1.
Tektronix MDO4000C Series Oscilloscope
Demonstration Guide
MDO4000C Series
Front Panel Overview
Side-bezel
buttons
Wave Inspector
navigation and
search controls
Trigger
controls
Application
module slots
Spectrum
analyzer
controls
Bottom-bezel
buttons
16 digital
channels
B1, B2, B3 Arbitrary function Vertical
bus buttons
generator
controls
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Tektronix MDO4000C Series Oscilloscope
Demonstration Guide
Exercise 1
Capturing Elusive Events with FastAcq™
High Waveform Capture Rate
To debug a design problem, first you must know it exists.
The MDO4000C Series oscilloscope offers Tektronix
proprietary FastAcq™ technology. It delivers a fast waveform
capture – up to 340,000 waveforms per second – that
enables you to see glitches and other infrequent transients
within seconds, revealing the true nature of device faults.
To further enhance the visibility of rarely occurring events,
intensity grading is used with multiple waveform palettes
to choose from, indicating how often rare transients are
occurring relative to normal signal characteristics. The
FastAcq waveform palettes are Temperature (color-grading
frequency of occurrence), Spectral (color-grading frequency
of occurrence), Normal (gray-scale where frequently occurring
events are bright) and Inverted (gray-scale where rare events
are bright).
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Figure 2.
This demo illustrates how FastAcq high waveform capture
rate can find anomalies quickly and display them with colorgrading. The demonstration looks for an erroneous runt signal
that occurs approximately every 838.8ms.
Tektronix MDO4000C Series Oscilloscope
Demonstration Guide
1. Connect a passive probe to channel 1
on the oscilloscope.
2. Connect the ground lead of the probe
to the GND point and the probe tip to
the RARE_ANOMALY signal on the
demonstration board.
3. Press the Default Setup button to set
the oscilloscope to the factory setup,
and then press Autoset.
Figure 3.
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Tektronix MDO4000C Series Oscilloscope
Demonstration Guide
4. Press the Menu Off front panel button.
5. Press the Intensity front panel button
and turn Multipurpose a control
clockwise to set the Waveform Intensity
to 95%.
6. Press the Intensity front panel button.
Figure 4.
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Tektronix MDO4000C Series Oscilloscope
Demonstration Guide
7. Press the Acquire front-panel button.
8. Press the FastAcq lower-bezel button.
Turn on the FastAcq by pressing
FastAcq side-bezel button and select
On.
9. Press the Waveform Display lowerbezel button.
10. Turn Multipurpose a clockwise to adjust
persist time to ∞ s (infinite).
This step will ensure that all events captured
will remain displayed on the oscilloscope.
After several seconds you will notice that
erroneous patterns in dark blue will begin
filling the display. The digital phosphor display
with color intensity grading shows the history
of the signal’s activity by using color to
identify areas of the signal that occur more
frequently, providing a visual display of just
how often anomalies occur.
Figure 5.
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Tektronix MDO4000C Series Oscilloscope
Demonstration Guide
Now we see an erroneous runt in the signal.
To capture it, follow the steps below.
11. Press Set to Auto the side-bezel button
to turn off infinite persistence.
12. Press trigger Menu, select Type Edge
lower-bezel button, use Multipurpose a
to scroll down to Runt.
13. Press the Thresholds lower-bezel
button, adjust High to approximately
2.00 V using Multipurpose a, and adjust
Low to about 1.00 V using Multipurpose
b.
14. Press the Mode lower-bezel button and
press the Normal side-bezel button.
15. Press the Menu Off button twice to
remove the menus. You should be
triggering on the runt signal.
Figure 6.
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Tektronix MDO4000C Series Oscilloscope
Demonstration Guide
Exercise 2
Wave Inspector® Navigation and
Automated Search
Trying to find one particular event, such as a spike on your
signal or a runt pulse, in a long waveform record can be
difficult. For example, a 20 Mpoint record length on the
MDO4000C is equal to over 20,000 oscilloscope screens
worth of data! To make it easier to find what you are looking
for, the MDO4000C Series has a special feature called Wave
Inspector which provides tools for quickly moving through
long records including an automated search function.
The following steps will explore the use of waveform
navigation and search tools that greatly simplify finding
events of interest.
Figure 7.
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Tektronix MDO4000C Series Oscilloscope
Demonstration Guide
1. Connect the channel 1 probe tip to the
FREQ_ANOMALY (Frequent Anomalies)
signal on the demonstration board.
Connect the ground lead of the probe to
the GND point.
2. Press the front panel Default Setup
button to set the oscilloscope to a
known state. Press Autoset.
3. Press trigger Menu, select Type Edge
lower-bezel button, use Multipurpose a
to scroll down to Runt.
4. Press the Thresholds lower-bezel button,
adjust High to approximately 2.00 V using
Multipurpose a, and adjust Low to about
1.00 V using Multipurpose b.
Now you are triggering on a runt.
Figure 8.
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Tektronix MDO4000C Series Oscilloscope
Demonstration Guide
Capturing the signal with sufficient detail
is critical to successful debugging. For
example, if you are interested in how frequent
the runt signal occurs, you can acquire a
long time window with a long record length
and search for runt signals.
5. To increase the record length, press
Acquire, select the Record Length
lower-bezel button, then select 20
Mpoints using Multipurpose a.
6. Press the Menu Off button to remove
the menus.
7. Turn the Horizontal Scale control to
select 2.00 ms/div.
8. Press the front panel Single button to
make an acquisition.
Figure 9.
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Tektronix MDO4000C Series Oscilloscope
Demonstration Guide
9. Press the front panel Search button.
10. Press the Search lower-bezel button.
11. Press the Copy Trigger Settings To
Search side-bezel button.
Now all runts in the acquisition that meet this
trigger specification are marked with a hollow
white triangle at the top of the display. Notice
the number of search events shown in the
lower left corner is three.
Figure 10.
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Tektronix MDO4000C Series Oscilloscope
Demonstration Guide
It is very difficult to see much signal detail in
this display. If we zoom in on the waveform,
the details become visible.
12. Press the Menu Off button to remove
the menus.
13. Turn the inner Wave Inspector control
and notice how the upper window of
the display shows the context while
the lower window shows the zoomed
details.
14. Turn the outer, spring-loaded Wave
Inspector control to pan right and left
through the acquired waveform. The
further you turn the control, the faster the
panning.
15. You can also navigate to one of the
marks using the ← and → arrow
buttons.
Figure 11.
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Tektronix MDO4000C Series Oscilloscope
Demonstration Guide
Exercise 3
Decoding, Triggering and Searching
Serial Buses
Tired of having to visually inspect serial data streams to
determine if each bit is a 1 or a 0? Tired of having to start,
stop, and then manually combine bits into bytes to determine
hex values? The MDO4000C Series can automatically decode
and trigger on packet-level content, such as the start of a
packet, specific addresses, specific data content, and unique
identifiers on popular serial interfaces, such as I2C, SPI, CAN,
LIN, FlexRay, USB2.0, RS-232, RS-422, RS-485, UART,
Audio, MIL-STD-1553, and Ethernet. The MDO4000C Series
also provides a Bus Display view of the individual signals
that make up the bus, such as clock, data, and chip enable.
This Bus Display view makes it easy for you to identify where
packets begin and end, and to identify sub-packet components,
such as address, data, identifiers, CRC and so on.
This exercise demonstrates the ability of the MDO4000C
Series to help you debug I2C circuits.
Note: Serial Bus Analysis modules are available for purchase.
For demonstration purposes all application modules and
options are enabled in MDO4000C demo units.
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Figure 12.
Note: You can find more serial bus demonstrations in
MDO4000C built-in demos. Press the front panel Utility
button. Press then Utility Page lower-bezel button. Select
Demo using Multipurpose a. More serial bus demos are
under Serial Bus group.
Tektronix MDO4000C Series Oscilloscope
Demonstration Guide
1. Connect the channel 1 probe’s ground
lead to a point labeled GND on the
demonstration board. Connect the probe
tip to the I2C_CLK test point on the
demonstration board.
2. Connect the channel 2 probe’s ground
lead to a point labeled GND on the
demonstration board. Connect the probe
tip to the I2C_DATA test point on the
demonstration board.
3. Press the front-panel Default Setup
button.
4. Press the front-panel channel 2 button to
turn on channel 2.
Press the RESET button on the demo
board if there is no signal on the screen.
Figure 13.
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Tektronix MDO4000C Series Oscilloscope
Demonstration Guide
5. Turn the front-panel channel 1 and
channel 2 Vertical Scale controls to set
both channel 1 and channel 2 to 2.0 V/
div.
6. Turn the channel 1 and channel 2
Vertical Position controls to position
channel 1 in the upper half of the screen
and channel 2 in the lower half.
7. Turn the front-panel Horizontal Scale
control to set the horizontal scale to
20.0μs/div.
Figure 14.
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Tektronix MDO4000C Series Oscilloscope
Demonstration Guide
8. Press the B1 Bus front-panel button.
9. Press the Bus B1 lower-bezel button
and turn Multipurpose a to select I2C.
10. Press the Define Inputs lower-bezel
button.
11. In the side menu, confirm that the SCLK
Input is set to channel 1 and that the
SDA Input is set to channel 2.
Figure 15.
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Tektronix MDO4000C Series Oscilloscope
Demonstration Guide
12. Press the Thresholds lower-bezel
button.
13. Turn multipurpose a and b to set the
thresholds at about the midpoint of
each waveform. You could also use the
presets for common logic family voltages
from the Choose Preset side menu.
14. Press the front-panel Menu Off button
once to remove the
side menu.
15. Press the front-panel Single button to
acquire a single acquisition.
Now the scope automatically decodes I2C
bus. The decode bus may be different from
what you see here.
Figure 16.
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Tektronix MDO4000C Series Oscilloscope
Demonstration Guide
When debugging a system, you often want
to capture the state of some key signals
when a certain event occurs. One key event
may be the transmission of specific data over
the I2C bus.
The MDO4000C Series Oscilloscope
triggers on:
Start
Repeat Start
Stop
Missing Acknowledgements
Address
Data
Address & Data
To trigger on a specific address, follow
these steps:
16. Press the front-panel Trigger Menu
button.
17. Press the Type lower-bezel button and
turn Multipurpose a to select Bus.
18. Press the Trigger On lower-bezel
button.
Notice the list of trigger choices. The key
is that you can trigger on all the important
components of an I2C packet. Prior to this,
you had to hope that the acquisition you
were making contained the data of interest.
Now you can guarantee it by specifying the
trigger condition.
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Tektronix MDO4000C Series Oscilloscope
Demonstration Guide
19. Turn Multipurpose a to select Address.
20. Press the Address lower-bezel button.
21.The Address side-bezel button should
already be selected.
22. Turn Multipurpose a and b to enter a hex
address of 50.
- Turn Multipurpose a clockwise to the
first ‘X’ under Hex
- Turn Multipurpose b clockwise to
show the digit ‘5’.
- Turn Multipurpose a clockwise to
move the cursor to the next ‘X’
- Turn Multipurpose b clockwise to
show the ‘0’ digit
Figure 17.
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Tektronix MDO4000C Series Oscilloscope
Demonstration Guide
23. Press the Direction lower-bezel button.
24. Select the Write side-bezel button.
25.Press Single to make an acquisition.
26.Press Menu Off once.
Notice that the oscilloscope now triggers on
writes to address 50.
Figure 18.
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Tektronix MDO4000C Series Oscilloscope
Demonstration Guide
In addition to seeing decoded packet data
on the bus waveform itself, you can view all
captured packets in a tabular view much like
you would see in a software listing. Packets
are time stamped and listed consecutively
with columns for each component (Address,
Data, etc.).
To view an event table:
27. Turn the front-panel Horizontal Scale
control to set the horizontal scale to 20.0
ms/div to capture more data.
28. Set the record length to 1M points or
higher to capture more details of the
signal. To change the record length,
press Acquire, press the Record
Length lower-bezel button, and then
select 1Mpoints.
29.Press Single.
30. Press the B1 Bus button.
31. Press the Event Table lower-bezel
button.
32. Press the Event Table On side-bezel
button.
33. Scroll through table with Multipurpose a.
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Figure 19.
Tektronix MDO4000C Series Oscilloscope
Demonstration Guide
You can also search for specific values or
packets. To search for data value hex 17:
34. Press the Search front panel button.
35. Press the Search lower-bezel button and
turn on search by pressing the Search
On side-bezel button.
36. Define the search type by pressing the
Search Type lower-bezel button and
selecting Bus.
37. Define the search criteria by pressing the
Search For lower-bezel button, selecting
Data, and pressing the Data lower-bezel
button.
38. Press the Data side-bezel button and
set hex data to 17h.
The oscilloscope automatically finds all
occurrences in the acquisition that meet the
search criteria and marks each event with a
hollow white triangle at the top of the display.
Notice the number of search events in the
lower left corner. Wave Inspector automated
searches save you time and give you
confidence that all events have been found.
Now you can use the Wave Inspector controls
to zoom in and manually navigate among the
marks to examine the signal details.
Figure 20.
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Tektronix MDO4000C Series Oscilloscope
Demonstration Guide
Exercise 4
Acquiring Analog and Digital signals of a
D/A Converter
Most embedded systems contain a mix of analog and digital
circuitry. MDO4000C Series oscilloscope with its Mixed Signal
Oscilloscope capability enables the acquisition of analog
and digital signals and displays them time correlated on the
display, providing insight into your complete system operation.
Automated measurements work on both analog and digital
channel data making it easy to learn even more about your
signal behavior. And because everything is automatically time
correlated, cursor measurements work across analog and
digital channels. The digital channel monitor shows activity on
digital channels at a glance without having to turn them on.
This exercise demonstrates how this oscilloscope can be used
to simultaneously view analog and digital signals by probing
both sides of a simple D/A convertor.
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Figure 21.
Note: You could purchase the MDO4MSO instrument option
to add 16 digital channels to your MDO4000C, which includes
the P6616 digital probe and accessories. For demonstration
purposes, many application modules and options are enabled
in MDO4000C demo units.
Tektronix MDO4000C Series Oscilloscope
Demonstration Guide
1. Connect Channel 1 to the DAC_OUT
signal on the demonstration board.
Connect the probe’s ground lead to
a point labeled GND on the
demonstration board.
2. Connect the P6616 Logic Probe to the
front-panel Logic Probe connector below
the oscilloscope display.
Note: Firmly insert the connector into the
probe port on the front of the oscilloscope
until you hear an audible ‘click’. Test that you
cannot remove the probe without pressing
the buttons on the sides of the connector.
3. Connect Group 1 of P6616 digital probe
to J1002 header labeled DAC_IN_0
through DAC_IN_7 on the demonstration
board.
Note: Make sure to connect the signal side
of the probe header, with the color-coded
channel labels, to the signal side of the
connector and the ground side of the probe
to the ground side of the connector.
Figure 22.
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Tektronix MDO4000C Series Oscilloscope
Demonstration Guide
4. Press the front-panel Default Setup
button.
5. Change the Horizontal Scale to
4.00ms/div.
6. Set the trigger level to 50% of Ch1 by
pressing the trigger Level control.
7. Adjust the Vertical Position to place the
signal in the middle of the upper half of
the display.
8. Press the trigger Menu front panel
button.
9. Press the Coupling DC lower-bezel
button. Select the HF Reject sidebezel button to reject high frequency
components of the signal.
Figure 23.
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Tektronix MDO4000C Series Oscilloscope
Demonstration Guide
10. Press the blue D15-D0 front-panel
button and the D15-D0 On/Off lowerbezel button.
11. Press the Turn On D7-D0 side-bezel
button to display channels D0 through
D7.
12. Press the Monitor lower-bezel button to
turn on the digital channel Monitor.
13.Press Single to make an acquisition.
14. Press the B1 Bus front-panel button.
15. Press the Define Inputs lower-bezel
button.
16. Use the Multipurpose a control to set the
Number of Data Bits to 8.
17. Press the Menu Off button once.
18. Use the Multipurpose a control to
position the parallel bus waveform on the
display.
19. Use the front-panel Wave Inspector
controls to zoom in and examine the
signal details.
Figure 24.
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Tektronix MDO4000C Series Oscilloscope
Demonstration Guide
Exercise 5
Generating Waveforms with the Integrated AFG
Arbitrary function generators (AFG) are useful in a number of
applications, including adding noise to signals to test noise
immunity in a system, emulating missing components in a
design, and sweeping frequencies or modulating signals for
characterization in time/frequency domains.
The MDO4000C Series oscilloscope with the 50 MHz
integrated AFG can easily replicate signals acquired by the
oscilloscope with added noise or other analog characteristics.
The MDO4000C also works in conjunction with ArbExpress
PC-based arbitrary waveform editing software to create even
more complex waveforms that can be generated by the AFG
in the oscilloscope.
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This exercise shows how you can capture a waveform on the
oscilloscope, transfer it to the arbitrary function generator and
replicate it.
Note: You could purchase the MDO4AFG option to enable
the AFG functionality. For demonstration purposes MDO4AFG
option is enabled in MDO4000C demo units.
Tektronix MDO4000C Series Oscilloscope
Demonstration Guide
1. Connect a BNC cable to Channel 1 and
to the AFG OUT connector on the rear of
the oscilloscope.
2. Connect a passive probe to Channel 2
on the oscilloscope.
3. Connect the ground lead of the probe
to the GND point and the probe tip to
the RARE_ANOMALY signal on the
demonstration board.
4. Press the Default Setup front-panel
button.
5. Press the Channel 1 front-panel button
twice to turn off channel 1 and press the
Channel 2 front-panel button to turn
on channel 2.
6. Turn the Horizontal Scale control to
select 200 ns/div.
7. Press trigger Menu, press the
Type lower-bezel button, and use
Multipurpose a to scroll down to Runt.
Figure 25.
8. Press the Source 1 lower-bezel button
and change the source to Channel 2.
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Tektronix MDO4000C Series Oscilloscope
Demonstration Guide
9. Press the Thresholds lower-bezel button,
adjust High to approximately 2.00 V
using Multipurpose a, and adjust Low to
about 1.00 V using Multipurpose b.
10. Press the Mode lower-bezel button.
Press the Normal side-bezel button.
11. Press Single to take one acquisition.
12. Press the AFG front panel button to
open the AFG menu.
13. Press the Waveform Sine lower-bezel
button, and use Multipurpose a to select
Arbitrary.
14. Press the Waveform Edit lower-bezel
button.
15. Press the Load Waveform lower-bezel
button.
16. Press the OK Load button to copy the
acquired waveform on Channel 2 into
the arbitrary edit memory.
Figure 26.
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Tektronix MDO4000C Series Oscilloscope
Demonstration Guide
17. Press the Channel 2 front panel button
twice to turn off channel 2 and press the
Channel 1 front panel button to turn on
channel 1.
18. Press the Run/Stop front panel button
to start acquiring the output of the AFG.
19. Turn the front-panel channel 1
Vertical Scale control to set channel
1 to 1.00 V/div.
20. Press the Trigger Menu front panel
button.
21. Press the Source lower-bezel button
and change the source to Channel 1.
22. Press the Thresholds lower-bezel
button, adjust High to approximately
2.00 V using Multipurpose a, and
adjust Low to about 1.00 V using
Multipurpose b.
Now you are triggered on the runt signal
generated by MDO4000C’s integrated AFG.
Figure 27.
www.tektronix.com/mdo4000C
37
Tektronix MDO4000C Series Oscilloscope
Demonstration Guide
Exercise 6
Measuring Signals with the Integrated DVM / Frequency Counter
The integrated digital voltmeter (DVM) is free when you register
your MDO4000C. It monitors voltage values of critical signals
or power rails in your system at a glance without having to
connect a separate meter. The oscilloscope offers 4-digit
Voltage Measurements for AC+DC RMS, AC RMS, and DC
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and 5-digit Frequency Measurement through the same probes
as the oscilloscope channels. This functionality is decoupled
from the scope trigger circuit allowing for uninterrupted
measurements that are always available and updating, even
when the scope is not running.
Tektronix MDO4000C Series Oscilloscope
Demonstration Guide
This exercise shows how you can measure
DC voltage on a signal over time.
1. Connect a BNC cable to Channel 1 and
to the AFG output on the rear of the
oscilloscope.
2. Press the Default Setup front-panel
button.
3. Press the AFG front panel button to
bring up the AFG menu.
4. Select the Waveform Settings lowerbezel button to change the Amplitude
and Offset of the sine waveform.
5. Use the key pad (or Multipurpose a and
b) and side-bezel buttons to set the
AFG output to a Sine wave at 100 kHz
Frequency, 1Vp-p Amplitude, and a
500mV Offset.
6. Set Horizontal Scale to 10μs/div.
7. Set Ch1 Vertical Scale to 200mV/div
and use vertical Position to center the
waveform on the display.
8. Press the Trigger Level control to set the
trigger level to 50% of Ch1.
Figure 28.
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Tektronix MDO4000C Series Oscilloscope
Demonstration Guide
9. Press the Measure front panel button.
10. Press the DVM lower-bezel button to
turn on the DVM.
11. Use Multipurpose a to choose DC Full
DVM display.
12. Press Menu Off to remove all menus.
The easy-to-read display offers you both
numeric and graphical representations of the
changing measurement values. The readouts
at the right side of the display accumulate
the minimum, maximum, and average
values of the measurement over the entire
measurement period. The graphic shows the
range of values measured over the previous
five second interval.
Figure 29.
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Tektronix MDO4000C Series Oscilloscope
Demonstration Guide
Exercise 7
Fast and Accurate Spectral Analysis with
Integrated Spectrum Analyzer
With the addition of a true RF acquisition system, N-connector,
and dedicated spectrum analyzer controls and user interface,
any MDO4000C Series product can be equipped with an
integrated spectrum analyzer. The MDO4000C’s spectrum
analyzer offers better RF measurement performance than FFT
math operations found on traditional oscilloscopes.
Now you can continue to use your tool of choice – the
oscilloscope – for all of your debugging needs, regardless
of time or frequency domain. When the need arises to view
RF signals, it is far simpler and faster to continue using your
tool of choice – the oscilloscope – rather than finding and
relearning a spectrum analyzer.
When using the spectrum analyzer by itself, the MDO4000C
looks and operates just as a like a stand-alone spectrum
analyzer. This exercise shows the automated markers and
spectrogram functionality on the MDO4000C.
Figure 30.
Note: You could purchase option SA3 to enable the spectrum
analyzer with a 3 GHz input range, or option SA6 to enable
the spectrum analyzer with a 6GHz input range, on your
MDO4000C. For demonstration purposes, the SA6 option is
enabled in MDO4000C demo units.
www.tektronix.com/mdo4000C
41
Tektronix MDO4000C Series Oscilloscope
Demonstration Guide
A. Spectral Peak Identification
Identifying peaks in your spectrum is one of the first steps to
understanding the behavior of your design. Whether you are
using the basic marker functions or analyzing noise density or
phase noise, easy-to-use tools are critical for saving time.
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Simply define threshold and excursion values to automatically
mark all peaks that meet your criteria. Or use manual markers
to investigate any non-peak areas of the spectrum.
Tektronix MDO4000C Series Oscilloscope
Demonstration Guide
This exercise demonstrates how the
frequency and amplitude of peaks in
the spectrum are quickly identified with
automatic peak markers.
1. Attach an N-to-BNC adapter to the RF
input on the oscilloscope.
2. Connect a BNC cable to the adapter.
3. Connect the other end of the cable to
the RF Out (BNC) connector on the
demonstration board.
4. Press the Mode button on the MDO
Demonstration board until the Multiple
Peaks LED is lit.
5. Press the Default Setup front-panel
button.
Figure 31.
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Tektronix MDO4000C Series Oscilloscope
Demonstration Guide
6. Press the channel 1 front panel-button
twice to turn off channel 1.
7. Press the RF front panel button to turn
on the RF channel.
8. Press the Freq/Span front-panel button
under the spectrum analyzer controls.
9. Use Multipurpose a or the 10-digit
keypad to set the Center Frequency to
2.4 GHz.
10. Use Multipurpose b to set the Span to
20 MHz.
11. Press the Markers front-panel button.
12. Use Multipurpose a to set number of
Peak Markers to 11.
13. Press the Threshold side-bezel button
and use Multipurpose a to set threshold
to -70.0 dBm.
Notice that peaks meeting the criteria are
indicated with Absolute Frequency and
Amplitude Readouts. The highest-amplitude
peak is the Reference Marker and is shown
in red.
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Figure 32.
Tektronix MDO4000C Series Oscilloscope
Demonstration Guide
14. Press the Readout side-bezel button to
select Delta.
Notice peak readouts are now relative to the
Reference Marker (the red triangle).
15. Press the Manual Markers side-bezel
button.
Notice the Ref Marker can now be moved
anywhere via manual markers and the
second marker allows you to investigate nonpeak areas of the spectrum.
Figure 33.
www.tektronix.com/mdo4000C
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Tektronix MDO4000C Series Oscilloscope
Demonstration Guide
B. Spectrogram Demonstration
Spectrograms are useful for monitoring slowly-changing RF
events, and for identifying low amplitude signals that are too
subtle for the eye to catch. The spectrogram display provides
an intuitive color map showing how the signal varies over time.
You can even go back and compare previously acquired data.
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You can monitor portions of the signal (triggered) or look at a
wider range of signals (free run). For many designs, spectrum
analysis begins with signal visualization and the spectrogram
makes this task even easier.
Tektronix MDO4000C Series Oscilloscope
Demonstration Guide
This exercise demonstrates how the
oscilloscope spectrogram shows what is
happening in the spectrum over time, and
shows how to look at the Spectrum Slices
using the Multipurpose a control.
1. Follow step 1 to 3 in the previous
exercise to connect the RF channel to the
demonstration board.
2. Press the Mode button on the
Demonstration board until the Spectrogram
LED is lit.
3. Press the Default Setup front-panel button.
4. Press the channel 1 front panel-button
twice to turn off channel 1.
5. Press the RF front panel button to turn on
RF channel.
6. Press the Freq/Span front-panel button.
7. Press the R to Center side-bezel button to
set the Center Frequency to the frequency
of the reference marker.
8. Use Multipurpose b to set span to 10 MHz.
9. Press the Ampl front-panel button.
10. Using the Multipurpose a control, set the
Ref Level to -10.0 dBm.
Figure 34.
Notice that the amplitudes and frequencies of
the spectral peaks are moving over time.
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47
Tektronix MDO4000C Series Oscilloscope
Demonstration Guide
11. Press the RF front panel button to turn
on the RF menu.
12. Press the Spectrogram lower-bezel
button.
13. Press the Display On side-bezel button
to turn on the spectrogram.
A Spectrogram shows how the spectrum
changes over time. The x-axis is frequency,
the y-axis is time. A Spectrogram is created
by taking each spectrum and flipping it up
on its edge so that it’s one pixel row tall and
then using color to indicate amplitude. Hotter
colors (red, yellow) indicate higher amplitudes
while colder colors (blue, green) indicate
lower amplitudes.
Figure 35.
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Tektronix MDO4000C Series Oscilloscope
Demonstration Guide
14. Press the Run/Stop front panel button
to stop acquiring.
15. Turn the Multipurpose a control to scroll
through Spectrum Slices.
Figure 36.
www.tektronix.com/mdo4000C
49
Tektronix MDO4000C Series Oscilloscope
Demonstration Guide
Exercise 8
Mixed Domain Analysis: Viewing Complete
System Activity
The MDO4000C Series can be used as an oscilloscope, or
a spectrum analyzer, or combined to capture synchronized
analog, digital, and RF signals. The power of the MDO4000C
Series goes beyond simply observing the frequency domain
as you would on a spectrum analyzer. The real power is in its
ability to correlate events in the frequency domain with the
time domain phenomena that caused them.
Debugging EMI or modern wireless-enabled designs often
requires investigation of more than just the RF signal.
Understanding timing relationships between the RF and other
analog, digital, or bus signals in the device under test is critical
but incredibly difficult with multiple stand-alone pieces of test
equipment that weren’t designed for the task.
Figure 37.
This demo shows the MDO4000C Series’ unique ability to
use a single trigger event to synchronize and display timecorrelated analog, digital and RF signals, and to view the RF
Spectrum at any point in time within the acquisition to see
how it changes over time or with device state.
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Tektronix MDO4000C Series Oscilloscope
Demonstration Guide
1. Connect Channel 1 probe tip to the
VCO-1 Enable signal on the demo
board. Connect the probe’s ground lead
to a point labeled GND on the demo
board.
2. Connect Channel 2 probe tip to the
PLL-1 Voltage signal on the demo board.
Connect the probe’s ground lead to a
point labeled GND on the demo board.
3. Connect digital probe D0 to SPI_CLK,
D1 to SPI_SS-1, and D2 to SPI_MOSI
signals on the demo board.
4. Attach an N-to-BNC adapter to the RF
input on the oscilloscope.
5. Connect a BNC cable to the adapter.
6. Connect the other end of the cable to
the RF Out (BNC) connector on the
demonstration board.
7. Press the Mode button on the MDO
Demo board until the VCO/PLL-1 LED
is lit.
8. Press the Default Setup front-panel
button.
Figure 38.
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51
Tektronix MDO4000C Series Oscilloscope
Demonstration Guide
9. Press the Utility front panel-button.
10. Press the Utility Page lower-bezel button
and select Demo using Multipurpose a.
11. Press the Spectrum Analyzer lowerbezel button and the VCO/PLL Turn On
side-bezel button.
12. Press the Recall Demo Setup side-bezel
button.
13. Press the Menu Off front-panel button.
14. Press the Single front-panel button to
arm the scope for an acquisition.
15. Press the VCO-1 Enabled button on the
demo board. The LED next to the button
should turn off.
16. Press the VCO-1 Enabled button again.
The LED next to the button should light
and the scope should acquire data.
17. Turn the outer ring of the front-panel
Wave Inspector control counterclockwise to move the Spectrum Time
indicator (orange bar) to the left of the
VCO Enable signal’s rising edge. The
frequency-domain display shows that the
oscillator is not generating an RF signal
prior to the VCO being enabled.
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Figure 39.
Tektronix MDO4000C Series Oscilloscope
Demonstration Guide
18. Turn the outer ring of the front-panel
Wave Inspector control clockwise to
move the Spectrum Time indicator
(orange bar) through the acquisition until
the Spectrum Time indicator is near the
right side of the display.
What’s happening?
The VCO (voltage controlled oscillator) is
enabled when channel 1 goes high.
Next a command on the SPI bus tells
the VCO/PLL (phase-locked loop) circuit
the desired frequency, which in this case
is 2.4 GHz.
Once the SPI command has been
transmitted, the VCO/PLL circuit begins
tuning to the desired frequency.
In this screenshot, a single acquisition of
the entire turn-on event has been made by
triggering on the SPI serial bus command
indicating the setting of the desired 2.4
GHz frequency.
With the MDO4000C Series, you can easily
correlate frequency domain events with
relevant time domain control signals, enabling
you to quickly and easily make critical timing
measurements such as time to stability of a
VCO/PLL circuit.
Figure 40.
www.tektronix.com/mdo4000C
53
Tektronix MDO4000C Series Oscilloscope
Demonstration Guide
Exercise 9
Quickly Characterize Time-Varying
RF Events
Characterizing and correlating time-varying RF events with
analog signals can be difficult and time-consuming. With the
MDO4000C Series, you can easily monitor system behavior
with easy-to-use signal visualization tools.
The MDO4000C series provides support for three RF time
domain traces that are derived from the underlying I and Q
data of the spectrum analyzer input including:
RF Amplitude vs. Time
RF Frequency vs. Time
RF Phase vs. Time
Figure 41.
This demo illustrates how to use the RF vs Time traces to
quickly characterize time-varying events of a frequencyhopping signal (such as how long it takes to settle to a new
frequency).
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Tektronix MDO4000C Series Oscilloscope
Demonstration Guide
1. Connect Channel 1 to the TRIGGER
signal on the demo board. Connect the
probe’s ground lead to a point labeled
GND on the demo board.
2. Attach an N-to-BNC adapter to the RF
input on the oscilloscope.
3. Connect a BNC cable to the adapter.
4. Connect the other end of the cable to
the RF Out (BNC) connector on the
demonstration board.
5. Press the Mode button on the MDO
Demo board until the Frequency Hop
LED is lit.
6. Press the Default Setup front-panel
button.
Figure 42.
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55
Tektronix MDO4000C Series Oscilloscope
Demonstration Guide
7. Press the Utility front panel-button.
8. Press the Utility Page lower-bezel
button and select Demo using
Multipurpose a.
9. Press the Spectrum Analyzer lowerbezel button, the –more- side-bezel
button, and the Frequency Hop sidebezel button.
10. Press the Recall Demo Setup sidebezel button.
11. Press the Menu Off front-panel button.
12. Press the Single front-panel button to
acquire a single acquisition.
13. Turn the outer ring of the front-panel
Wave Inspector control counterclockwise to move the Spectrum Time
indicator (orange bar) a couple of
divisions to the left of the center of the
display. As you move the Spectrum
Time indicator, notice how the frequency
versus time trace in the upper half of the
display corresponds to the spectrum in
the lower half of the display.
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Figure 43.
Tektronix MDO4000C Series Oscilloscope
Demonstration Guide
14. Use the outer ring of the front-panel
Wave Inspector control to move the
Spectrum Time indicator (orange bar)
through the acquisition to see how the
spectrum changes with the Frequency
Modulation.
15. Position the Spectrum Time indicator
a couple of divisions to the right of the
center of the display.
What’s happening?
The Trigger signal on Channel 1 is a digital
control signal that initiates the frequency
hopping cycle. The VCO frequency is set to
about 2.397 GHz, then increased to 2.400 GHz,
and finally increased to about 2.403 GHz.
But notice that, between these stable
frequency settings, the MDO4000C allows
you to examine the time-domain undershoot
and overshoot in the frequency versus time
display, and the corresponding frequencydomain displays where the RF energy is
smeared across the spectrum.
Note that you can quickly characterize time
varying RF events (such as how long it takes
to settle to a new frequency or how much
overshoot/undershoot there is during a
transition) with RF vs. time traces.
Figure 44.
www.tektronix.com/mdo4000C
57
Tektronix MDO4000C Series Oscilloscope
Demonstration Guide
Exercise 10
Capturing Wideband Signals
RF standards continue to evolve to wider bandwidths. In
addition, many modern wireless devices transmit and receive
over multiple bands. Traditional spectrum analyzers do not have
the capture bandwidth necessary to debug these systems.
With the MDO4000C Series, you can see the whole spectrum
of interest at any point in time with the up to 3 GHz ultra-wide
capture bandwidth (approximately 100 times wider than the 1040 MHz capture bandwidths of traditional spectrum analyzers).
Note: Combined with SignalVu-PC, the MDO4000C offers
industry’s widest bandwidth vector signal analyzer providing
advanced modulation analysis.
Figure 45.
This demo shows you the power of the MDO4000C’s
exceptionally wide capture bandwidth (up to 3 GHz) by
capturing an RF device’s transition from 900 MHz to 2.4 GHz
in a single acquisition.
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Tektronix MDO4000C Series Oscilloscope
Demonstration Guide
1. Connect the probe on Channel 1 to the
TRIGGER signal on the demo board.
Connect the probe’s ground lead to a
point labeled GND on the demo board.
2. Attach an N-to-BNC adapter to the RF
input on the oscilloscope.
3. Connect a BNC cable to the adapter.
4. Connect the other end of the cable to
the RF Out (BNC) connector on the
demonstration board.
5. Press the Mode button on the MDO
Demo board until the Capture BW LED
is lit.
6. Press the Default Setup front-panel
button.
Figure 46.
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59
Tektronix MDO4000C Series Oscilloscope
Demonstration Guide
7. Press the Utility front panel-button.
8. Press Utility Page and select Demo
using Multipurpose a.
9. Press the Spectrum Analyzer lowerbezel button and the Capture BW
side-bezel button. If necessary, press the
–more- side-bezel button to display the
second page of the menu.
10. Press the Recall Demo Setup sidebezel button.
11. Press the Menu Off front-panel button.
12. Press the Single front-panel button to
acquire single acquisition.
Notice the Span is set to 3 GHz, indicating a
3 GHz capture bandwidth. Also, notice that
the frequency-domain display clearly shows
a 900 MHz signal (and its harmonics). The
device under test is currently communicating
to a device in the 900 MHz ISM radio band.
13. Turn the outer ring of the front-panel
Wave Inspector control slowly clockwise,
positioning the Spectrum Time indicator
(orange bar) directly under the pulse on
Channel 1. Notice that the 900 MHz
signal has been turned off.
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Figure 47.
Tektronix MDO4000C Series Oscilloscope
Demonstration Guide
14. Use the outer ring of the front-panel
Wave Inspector control to move the
Spectrum Time indicator (orange bar)
before and after the pulse on Channel 1.
15. Position the Spectrum Time indicator
a couple of divisions to the right of the
center of the display.
What’s happening?
The pulse seen on channel 1 is a control
signal switching the RF output from 900 MHz
to 2.4 GHz. We are capturing this transition
in a single acquisition! This ability to look
across 3 GHz of spectrum and correlate the
RF activity to other analog and digital signals
is unique to the MDO4000C Series.
In this screen shot, Spectrum Time has been
moved to view the spectrum after the trigger
event. In the spectrum, the digital control
signal (the trigger event) results in the RF
output switching from communicating from
one device in the 900 MHz ISM radio band to
another device in the 2.4 GHz ISM radio band.
Notice that both the 900 MHz and 2.4 GHz
ISM radios bands are captured in a single
acquisition. A typical spectrum analyzer with
capture bandwidth of 10-40 MHz could not
capture this wideband, transitory event.
Figure 48.
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Tektronix MDO4000C Series Oscilloscope
Demonstration Guide
Locating Signals on Demo Board
The following diagram includes a grid to help you locate
signal outputs. To find a particular signal output on the board,
look up the connector grid location in the following Signal
Descriptions section and use the grid location information to
find the signal on the demo board.
Figure 49.
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Tektronix MDO4000C Series Oscilloscope
Demonstration Guide
Capture BW Demo
DAC Input, Parallel
DAC Output
The RF output connector generates both
a 2.4 GHz signal and a 900 MHz signal
simultaneously to show the broad frequency
capture capability.
Board label: DAC_IN0, DAC_IN1, DAC_IN2,
DAC_IN3, DAC_IN4, DAC_IN5, DAC_IN6,
DAC_IN7
Board label: DAC_OUT
The red LED labeled “Capture BW” at grid
B12 turns on.
Grid location: H3, H4
Description: These signals are the input to
the DAC. These are also the 8-bit parallel
output signals of the port expander in the
middle of the mixed signal chain. The sine
wave data from the SPI bus is converted to 8
parallel bits to drive the DAC. DAC_IN0 is the
LSB. (See Figure 47.)
Grid location: H3
Description: This is the output of the DAC at
the end of the mixed signal chain. The DAC
is driven from the port expander. The DAC
output is a sine wave. Since the output is not
filtered, the digitizing levels are present in the
output waveform. (See Figure 47.)
The resulting DAC voltage is a sine wave with
an amplitude of 0 to 3 volts, and a period of
31 ms.
Figure 50. Mixed signal chain block diagram.
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Tektronix MDO4000C Series Oscilloscope
Demonstration Guide
Frequent Anomaly
Frequency Hop Demo
Mode Button
Board label: FREQ_ANOMALY
The RF output connector generates three
frequency steps. These are centered at 2.4
GHz and step up and down 3 MHz from the
CF (center frequency). By using the built-in
RF Frequency versus Time function of the
MDO4000B Series oscilloscopes, you can
see the frequency hop represented as a realtime waveform in the time domain.
Board label: Mode
Grid location: A9
Description: There are two frequently
occurring anomalies in this pulse train.
A half height runt signal occurs approximately
every 104.8 ms. Use a Runt trigger to isolate
the signal.
A 25 ns (narrow) pulse appears
approximately every 104.8 ms. Use a Pulse
Width trigger to isolate the signal.
The pulse train is a repeating group of three
pulses. The three pulses are 100 ns, 200 ns,
and 100 ns wide, with a 100 ns low between.
The group repeats at a 1.6 μs rate.
The anomaly is a group of four pulses. The
four pulses are 100 ns, 50 ns (narrow), 100
ns (runt), and 100 ns wide, with a 100 ns low
between, except for a 50 ns low before the runt.
The red LED labeled “Frequency Hop” at grid
B12 turns on.
I2C Bus
Board label: I2C_CLK, I2C_DATA
Grid location: H2, H3
Description: These are the I2C (Inter-IC
Communication) bus signals between the μC
and a serial EEPROM.
There are several different types of data
packets.
The clock rate is a 200 kHz, 0 to 5 volt signal.
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Grid location: A11
Description: Press this button to choose
which of the seven alternative signals to send
out of the RF output connector. Your current
choice is identified by which of the seven
related red LEDs is lighted.
Multiple Peaks Demo
The RF output connector generates an
array of frequencies, which are centered
around 2.4 GHz, to show the ability of
the MDO4000B Series oscilloscopes to
dynamically mark each peak in the frequency
domain with its exact frequency and
amplitude.
The red LED labeled “Multiple Peaks” at grid
location B11 turns on.
Tektronix MDO4000C Series Oscilloscope
Demonstration Guide
PLL-1 Voltage
Rare Anomaly
Reset Button
Board label: Voltage
Board label: RARE_ANOM
Board label: RESET
Grid location: E12
Grid location: A10
Grid location: B7
Description: This signal is the voltage on the
first PLL/VCO in the RF section of the board.
It typically operates at 2.4 GHz.
Description: The two less-frequent
anomalies in this pulse train can show up on
high waveform capture rate oscilloscopes.
Description: Press this button to start all
generated signals from a common point.
A half-height runt signal occurs
approximately every 838.8 ms. Use a Runt
trigger to isolate the signal.
A 25 ns (narrow) pulse appears in
approximately 838.8 ms. Use a Pulse Width
trigger to isolate the signal.
The pulse train is a repeating group of three
pulses. The three pulses are 100 ns, 200 ns,
and 100 ns wide, with a 100 ns low between
each pulse. The group repeats at a 1.6 μs rate.
RF Output
Board label: None
Grid location: H9
Description: Use the RF output from this
connector in the seven different RF demos
controlled by the Mode button. Directly
connect this output to the RF input of the
MDO4000B Series oscilloscope.
The anomaly is a group of four pulses. The
four pulses are 50 ns, 25 ns (narrow), 100 ns
(runt), and 100 ns wide, with a 100 ns low
between each pulse, except for a 25 ns low
before the narrow pulse.
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Tektronix MDO4000C Series Oscilloscope
Demonstration Guide
Spectrogram Demo
Trigger
VCO/PLL Turn On Demo
The RF output connector generates an
array of frequencies, which are centered
around 2.4 GHz and are both amplitude and
frequency modulated, to show the value of
the Spectrogram function on slowly changing
RF phenomena.
Board label: TRIGGER
The RF output connector, VCO-1 Enable
loop, and PLL-1 Voltage loop, and the
SPI_CLK, SPI_SS_1, and SPI_MOSI_1
square pin connectors generate signals
that show the interaction between the
control signals and the latency of the RF
output turning on and tuning to the desired
frequency. Use this mode with the VCO-1
On/Off push button, which toggles the state
of the VCO-1 on and off.
The red LED labeled “Spectrogram” at grid
location B11 turns on.
Description: This signal acts as a trigger
reference for the ASK Modulation, Frequency
Hop, and Capture BW demoes. It provides a
short positive pulse at the start of the event
of interest.
SPI Bus (for RF)
VCO-1 Enable
Board label: SPI_CLK, SPI_SS-1, SPI_
MOSI-1
Board label: VCO-1 Enable
Grid location: B12, C12, D12, H11
Description: Description: These are the SPI
(Serial Peripheral Interface) serial bus signals.
The SPI bus works as follows:
66
Grid location: G12, H11
Grid location: E12, H11
Description: This is a digital control signal
that transitions from low to high to turn on
VCO-1 (2.4 GHz).
- SCLK rising edge clock
VCO-1 On/Off Button
- Active Low SS
Board label: VCO-1 On/Off
- Active High MOSI data
Grid location: F11
This SPI bus is the control bus for several
different parts that control the RF output in
the RF based demoes.
Description: Push this button to toggle
VCO-1 on or off. Use this in the VCO/PLL
demo to turn the VCO off and then back on
to capture its start-up sequence.
www.tektronix.com/mdo4000C
The red LED labeled “VCO/PLL-1 Turn On”
at grid B11 turns on.
Tektronix MDO4000C Series Oscilloscope
Demonstration Guide
www.tektronix.com/mdo4000C
67
Contact Tektronix:
North America 1 (800) 833-9200
Worldwide visit: www.tektronix.com to find contacts in your area.
Copyright © 2015, Tektronix. All rights reserved. Tektronix products are
covered by U.S. and foreign patents, issued and pending. Information in this
publication supersedes that in all previously published material. Specification
and price change privileges reserved. TEKTRONIX and TEK are registered
trademarks of Tektronix, Inc. All other trade names referenced are the service
marks, trademarks or registered trademarks of their respective companies.
10/15
EA/
48W-60217-0
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