a transcat.com webinar presented by aglient technolgoes: scope technology improvements
DESCRIPTION
In this short presentation, we explore three main considerations when deciding to upgrade your Benchtop Oscilloscopes. 1.) new technology reduces time to debug, gives you better signal visualization 2.) integrated features reduce total equipment count, cost 3.) longer cal cycles reduce downtime and lower total cost of ownership Presented by Mike Hoffman, an Engineer for Agilent Technologies. Mike works at Agilent's Oscilloscopes and Protocol Division headquarters in Colorado Springs, where all X-Series oscilloscopes are designed.TRANSCRIPT
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Scope Technology Improvements
Save Time and Money by Upgrading Your Test Equipment
Presented by Mike Hoffman
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How Have Oscilloscopes Improved?
“Banner” Specifications
Bandwidth
Sample Rate
Memory Depth
Waveform Update Rate
Number of Channels
Other Important Factors
Triggering
Display Quality
Serial Bus Applications
Measurements & Analysis
Connectivity & Documentation
Probing
Total Cost of Ownership
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Handheld Most portable Battery operation Lowest performance
PC-based Module Lowest costEasy connectivity
to other analysis tools
Limited performance
Portable Benchtopwith embedded O.S. Most pervasive Best debug tool Easiest to use Limited analysis
Windows-based Mainframe Highest performance Most analysis Most expensive Windows only
Select the format that meets your performance requirements, use-model, and budget.
What Oscilloscopes are Out There?Form Factor Considerations
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#1 – BandwidthHow much do I need?
Step #2: Determine highest signal frequency content (fKnee).
fKnee = 0.5/RT (10% - 90%) fKnee = 0.4/RT (20% - 80%)
Step #3: Determine degree of required measurement accuracy.
Required Accuracy
Gaussian Response
20% BW = 1.0 X fKnee
10% BW = 1.3 X fKnee
3% BW = 1.9 X fKnee
Step #4: Calculate required bandwidth.
Step #1: Determine fastest rise/fall times of device-under-test.
Source: Dr. Howard W. Johnson, “High-speed Digital Design – A Handbook of Black Magic”
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#1 – BandwidthHow much do I need?
fknee = (0.5/1 ns) = 500 MHz
3% Accuracy: Scope Bandwidth = 1.9 x 500 MHz = 950
MHz
20% Accuracy: Scope Bandwidth = 1.0 x 500 MHz = 500
MHz
Example (using the more accurate method):
Determine the minimum required bandwidth of an oscilloscope (assume Gaussian frequency response) to accurately measure digital signals that have rise times as fast as 1 ns (10-90%):
Agilent’s Recommendation:
Select a scope that has sufficient bandwidth to accurately capture the highest frequency content of
your signals.
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#2 – Memory DepthHow do scopes manage memory?
Scopes with deep acquisition memory can capture longer time spans while also sampling at a higher rate.
Scopes automatically adjust their sample rates based on the timebase setting and memory depth of the scope.
Deep memory Usually a manual selectionUsually slows update ratesUsually adds cost
Agilent’s MegaZoom IV Technology automatically turns on deeper memory when the scope is used on slower timebase settings in order to sustain faster sample rates, while also providing responsive waveform update rates.
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#2 – Memory DepthHow much memory do I need?
Step 1: Determine required sample rate (4x BW of signal)
Step 2: Determine longest time-span to acquire
Step 3: Required Memory Depth = Time-span/Sample Interval
Example:Required Sample Rate = 2 GSa/sSample Interval = 1/SR = 500 psLongest Time Span = 2 ms (200 µs/div)Required Memory Depth
= 2 ms / 500 ps= 4 MB
Agilent’s Recommendation:
Select a scope that has sufficient acquisition memory to capture your most complex signals
with high resolution.
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#2 – Memory DepthSegmented MemorySegmented Memory optimizes a scope’s available acquisition memory by only capturing important segments of an input signal. It is ideal for capturing bursts of signals such as packetized serial data that have long signal idle times between packets.
Example:Number of segments captured: 1000Time-tag of last segment: 3 secEquivalent memory depth: 120 MB
Segment #1Time-tag = 0.0 s
Segment #2Time-tag = 2.99 ms
Segment #1000Time-tag = 2.99 s
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Improves scope usability
Improves scope display quality
Improves scope probability of capturing infrequent events
#3 – Waveform Update RateWhy are fast update rates important?
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dead-time (děd’-tīm) n. 1.) Re-arm and waveform processing time between acquisition cycles. 2.) May be many orders or magnitude larger than the acquisition time.
#3 – Waveform Update RateWhat is dead time?
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% Dead-time = 95%Glitch Capture Probability = 91.8%
% Dead-time = 99.995%Glitch Capture Probability = 0.25%
No Glitches Captured
Ex #1: Update Rate = 1000 waveforms/sec Ex #2: Update Rate = 1,000,000 waveforms/sec
Multiple Glitches Captured
Glitch Rate = 10 occurrences/secViewing Window = 50 ns (5 ns/div)Observation Time = 5 seconds
#3 – Waveform Update RateInfrequent Glitch Capture Comparison
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#3 – Waveform Update RateMask Testing and Six Sigma
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#4 – Number of ChannelsHow many channels do I need?
2 & 4 Channel DSOs are common
> 4 Channel DSOs are less common and expensive
But many of today’s complex digital systems require measurements on more than 4 channels simultaneously.
Solution: Mixed Signal Oscilloscope (MSO)
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• What is an MSO?
Time-correlated display of scope and logic-timing waveforms
Full scope functionality with ease-of-use
Advanced logic triggering
MSOs combine ALL the measurement capabilities of an oscilloscope, with SOME of the measurement
capabilities of a logic analyzer.
Agilent’s Recommendation:
Select a scope that has a sufficient number of channels of acquisition so that you can perform critical time-
correlated measurements.
#4 – Number of ChannelsMixed Signal Oscilloscopes
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Think of oscilloscope “triggering” as “synchronized picture taking”.
One waveform “picture” consists of many consecutive digitized samples.
“Picture Taking” must be synchronized to a unique point on the waveform that repeats.
Most common oscilloscope triggering is based on synchronizing acquisitions (picture taking) on a rising or falling edge of a signal at a specific voltage level.
Triggering is often the least understood function of a scope, but is one of the most important capabilities
that you should understand.
A photo finish horse race is analogous to
oscilloscope triggering
#5 – TriggeringHow does it work?
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Default trigger location (time zero) on DSOs = center-screen (horizontally)
Only trigger location on older analog scopes = left side of screen
Trigger = Rising edge @ +2.01 V
Trigger Point
Positive TimeNegative Time
#5 – TriggeringEdge triggering
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Example: Trigger on 1110 0110 (E6HEX)
Some oscilloscopes can trigger on complex parallel bus conditions using Pattern triggering (especially useful on MSOs)
#5 – TriggeringAdvanced MSO Triggering
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Example: Trigger if setup time < 25 ns
Some oscilloscopes can trigger on clock-to-data timing violations using Setup & Hold Time triggering
Edge triggering reveals random shifting data edge
Infrequent timing shift
#5 – Triggering
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Some oscilloscopes can trigger using predefined zones, often called visual triggering or zone triggering.
#5 – TriggeringZone Triggering
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Agilent’s Recommendation:
Select a scope that has the types of advanced triggering that you may need to help you isolate waveform acquisitions on your most complex signals.
#5 – Triggering
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#6 – Display Quality
DSO with 2 levels of intensity gradation
Traditional analog scope
DSO with 64 levels of intensity gradation
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Factors to consider…
Number of levels of intensity modulation
Display size
Display resolution (VGA, XGA, etc.)
Color or Monochrome
Agilent’s Recommendation:
Select a scope that provides multiple levels of trace intensity gradation in order to display subtle waveform details and signal anomalies.
Intensity gradation can reveal relative jitter and noise
distribution on digital signals
#6 – Display Quality
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#7 – Serial Bus Applications
I2C SPI RS232/UART CAN LIN FlexRay MIL-STD 1553 ARINC 429 I2S USB
Serial buses are used pervasively in most of today’s designs to communicate: Between functional blocks Chip to chip Board to IO Remote sensor to control
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Protocol Decode
Lister/Event Table
Time-aligned Decode Trace
Frame ID = 07FFrame Type = Remote Transfer Request (RMT)Data Length Code = 1Data = N/ACRC = 60D9
#7 – Serial Bus ApplicationsToday’s Decode Method
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Protocols Supported?
Decoding MethodHardware-based?Software-based?
Serial TriggeringAddress/Frame ID?Data contents?Errors?
Post-acquisition Search & Navigation?
Serial Eye-diagram Mask Testing?Agilent’s Recommendation:
Select a scope that can trigger on and decode serial bus protocols to help you debug your designs faster.
#7 – Serial Bus ApplicationsThings to Consider
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Time & Voltage Cursors
Parametric MeasurementsRise Time, Vpp, Pulse width, etcMeasurement statisticsUser-selectable threshold settings
Waveform MathSum, Subtract, Integrate, FFT, etc.
Pass/Fail Mask Testing
Application-specific Compliance Testing
Agilent’s Recommendation:
Select a scope that can automatically perform your required measurements and waveform analysis to help you characterize
your designs faster.
#8 – Measurements and AnalysisThings to Consider
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Parametric Measurements
Pass/Fail Mask Testing
Waveform Math (FFT)
Application-specific Compliance Testing
#8 – Measurements and AnalysisAdvanced Examples
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GP-IB
RS-232
USB
LAN
Automated testing requires that your scope be fully programmable and linked to a PC via:
Supported on most older DSOs (sometimes optional)
Supported on most newer DSOs (sometimes optional)
All of Agilent’s oscilloscopes come standard with USB and/or LAN
connectivity.
#9 – Connectivity and DocumentationProgramming the Scope Remotely
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Saving Images (screen-shots)
BMP, TIF, PNG
Saving data (waveforms, protocol decodes)
CSV, ASCII, BINAgilent’s Recommendation:
Select a scope that meets your particular connectivity and documentation
requirements.
For documenting test results, you can transfer waveform data and/or images to a PC or save them to a USB memory stick on the scope in various formats on most of today’s digital oscilloscopes.
#9 – Connectivity and DocumentationDocumenting your Results
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Types of Oscilloscope Probes:Standard passive probesTypically included with scopeLimited to 500 MHz BW
High frequency passive probesBut with low Z input
High frequency active probes
Differential active probes
High voltage probes
Current probes
Agilent’s Recommendation:
Select a scope from a vendor that can also provide the variety of specialty probes that you may require.
Scope measurements are only as good as the what the probe can deliver to the scope’s
inputs.
#10 – Probing
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#11 – Total Cost of OwnershipCalibration, Repair, Replacement, Accessories, Upgrades, Software
Sticker price is only half the battle…
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#11 – Total Cost of OwnershipMaintenance
Sticker price is only half the battle…
Maintenance ConsiderationsCalibration
Down time Cost
Reliability MTBF Warranty
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#11 – Total Cost of OwnershipUpgrades
Sticker price is only half the battle…
Upgrade ConsiderationsProbesMore BandwidthMore ChannelsMeasurement Apps
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Application Notes Publication #
Evaluating Oscilloscope Fundamentals 5989-8064EN
Evaluating Oscilloscope Bandwidths for your Applications 5989-5733EN
Evaluating Oscilloscope Sample Rates vs. Sampling Fidelity 5989-5732EN
Evaluating Oscilloscopes for Best Waveform Update Rates 5989-7885EN
Evaluating Oscilloscopes for Best Display Quality 5989-2003EN
Evaluating Oscilloscope Vertical Noise Characteristics 5989-3020EN
Evaluating Oscilloscopes to Debug Mixed-signal Designs 5989-3702EN
Evaluating Oscilloscope Segmented Memory for Serial Bus Applications 5990-5817EN
http://cp.literature.agilent.com/litweb/pdf/xxxx-xxxxEN.pdf
Insert pub # in place of “xxxx-xxxx”
Getting More Information
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Scope
Series
Bandwidth Sample Rate (Max)
Memory
Depth
MSO Option
Function
Gen Opt.
Segmented
Memory Opt.
Serial Bus
Options
Advanced
Triggering
2000X
70 to 200 MHz 2 GSa/s 1M 8-Ch Yes 250
Segs Yes Serial only
3000X
100 to 500 MHz 4 GSa/s 4M 16-Ch Yes 1000
Segs Yes Optional
4000X
200 MHz to 1.5 GHz 5 Gsa/s 4M 16-Ch Dual 1000
Segs Yes Standard
Engineered for Best Signal Visibility
InfiniiVision 2000 X-Series InfiniiVision 3000 X-Series
Agilent InfiniiVision X-Series Oscilloscopes
InfiniiVision 4000 X-Series
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Thank You For Attending!
Questions or Comments?
Email the moderator, Nicole VanWert: [email protected]
Or contact Transcat sales at:
800-828-1470
www.Transcat.com