- Automated
Manufacturing Test of Serial Digital Video Equipment
- Unattended
Monitoring of Serial Digital Video Signals from Studios, STLs, Earth
Stations, and Transmitters
- Equipment
Installation and Maintenance
- SDI
Interoperability Troubleshooting
- SDTI
Interoperability Troubleshooting
Serial Digital Options
Options
1S and 2S are VM700T, VMTB and VMUPG upgrade options that add a state-of-the-art
serial digital video acquisition and analyzer module to a VM700T, Turbo
version VM700A or standard VM700A video measurement set, providing the
capability to display, capture and analyze the 270 and 360 Mbit
525 line and 625 line serial component and 143 Mbit 525 line serial
composite digital video signal with unprecedented ease and accuracy.
Now, for the first time, comprehensive analysis of analog video signals
and serial digital video signals is possible in a single package that
is the recognized leader in automatic video measurement sets worldwide.
The Features built into the VM700T/A Series SDI analyzer module are
the result of years of experience with professional television organizations
and in the designing and manufacture of advanced waveform/vector monitors
and automatic analyzers for the serial digital video operating environment.
Ease of Use
The
VM700T/A Serial Digital Video measurement option benefits from the proven
display technology and user interface that won a technical Emmy for
excellence. All SDI (Serial Digital Interface) measurement functionality
was designed with the highest degree of automation possible. The seasoned
professional video equipment manufacture to the first time SDI design
engineer will find the VM700T/A SDI analyzer option innovative, accurate,
fast and above all easy to use.
Many Capabilities
The
VM700T/A Serial Digital Video Analyzer module installs directly into
a VM700T or Turbo version VM700A. I/O connections are accessible on
the instrument rear panel and include two SDI inputs, a re-clocked SDI
output (switches with the active SDI input), an AES digital audio input,
a Longitudinal Time Code input for time stamping logged error files
and a loop-through analog blackburst input for timing reference. SDI
measurement applications can be selected through the instrument front
panel, touch panel interface or RS-232C or GPIB remote control drivers.
Simple to complex SDI measurement functions can be created directly
from the VM700T touch panel interface. Functions can be enabled manually,
automatically using the system's internal clock or via remote control.
Users who need to create and distribute VM700T SDI measurement functions
to additional VM700Ts will appreciate the FTP interface that allows
file transfers.
SDTI (SMPTE 305M) Serial Data Transport Interface Analysis
SMPTE
305M specifies a Serial Data Transport Stream that can be used to transport
packetized data within a studio/production center environment. The data
packets and synchronizing signals are compatible with ANSI/SMPTE 259M
and can therefore pass through existing plant routing equipment. The
growing use of SDTI to transfer digital video at faster-than-real-time
rates with none of the compression artifacts found in MPEG provides
tremendous potential to post/production applications. The VM700T Ancillary
Data Analyzer application can automatically detect the presence of the
SDTI signal as well as decode the SDTI Header data information for quick
proofs of the SDTI transport layer. Line number, line number CRC, code
and AAI, Destination address, Source address, Block type, CRC flag,
Data extension flag, Reserved data and Header CRC are all decoded and
clearly displayed.
Eye Diagram
A
fundamental requirement of any serial digital video measurement set
is the ability to verify the electrical characteristics of the SDI transport
layer. The VM700T SDI option allows comprehensive analysis of the serial
digital transport layer with a high resolution, equivalent time sampled
Eye Pattern Diagram. The Eye Pattern application allows direct observation
and verification of the analog characteristics of the serial data signal
while simultaneously providing full automatic measurements of all critical
signal parameters. Signal level, rise and fall time, rise and fall overshoot,
Jitter and DC offset of the serial data stream are continuously measured
and plotted on the VM700T/A crisp, high resolution CRT display. All
Eye parameter measurements are continuously compared against user programmable
limits providing instant notification of an out-of-tolerance condition.
An additional Eye monitoring display allows quick visual indications
as well as logging of all out of limit errors. For a more detailed analysis
of the Eye Diagram, voltage and timing cursors are available allowing
for direct manual measurements. Selection of 10 Hz and 1 kHz filters,
equalizer on-off, an automatic cable length meter and the ability to
select or deselect specific portions of the Eye Waveform for display
complete this application.
SDI Jitter Testing
Jitter
in the serial digital signal can occur as it is processed by distribution
amplifiers, routing switchers and other digital processing equipment
that operate directly on the signal exclusively in its serial form.
The VM700T SDI Jitter application provides analysis of SDI Jitter in
multiple ways. Peak-to-peak alignment and timing Jitter of the SDI transport
layer are continuously measured and displayed in either UI (Unit Intervals)
or time. As recommended by SMPTE practices 1 Hz and 1 kHz selectable
clock recovery bandwidths are available. Isolation of Jitter sources
is the first step in diagnosis and elimination. Therefore, the VM700T
SDI analyzer includes a Jitter spectrum display with over 100 times
the spectral range of any competitive device for detailed analysis and
identification of all Jitter frequency components. Additionally, a unique
Jitter waveform display provides the means to identify line or frame
correlated Jitter. Cursors are provided to allow precise measurement
of Jitter events in both frequency and time. An extremely useful relative
to reference mode is also provided allowing up to two Jitter measurement
references to be stored internally and used for difference measurements
with one of the two SDI inputs.
Real-time Format Monitor
Monitoring
for SDI format violations helps ensure trouble free communication between
serial digital devices. Random errors in timing signal placement or
other types of data errors, for example, can mean trouble in a data
recovery circuit. The VM700T SDI format analyzer provides the continuous,
real-time format monitoring capability required to quickly diagnose
those hard to find format errors in the serial digital signal. A wide
range of individual checks are performed with error conditions quickly
identified in a highly visible, easy to read monitoring display. Monitoring
checks include loss of signal, loss of lock, video line, blanking and
field length errors, EAV/SAV misplacement, ancillary data errors, audio
ancillary data errors, illegal luminance and chrominance values with
selectable search areas, 8/10-Bit validation, RP-165 validation, errored
seconds with time counter, event logging, frame capture on user definable
events and pattern search provide a total validation of the SDI signal
format.
Ancillary Data Analyzer
Once
problems are identified by the Real-time Format Monitor, the Ancillary
Data Analyzer can be automatically enabled to provide a more detailed
level of analysis and diagnosis capability. The primary display of the
Ancillary Data Analyzer provides a complete analysis of all data, including
field, line and sample number, data type, data values and interpretation
of data value. Data errors are immediately sensed, logged and indicated
in easy to see "bright up" boxes. A "Find Errors"
window scans forwards or backwards in the display buffer, locating and
providing a detailed text interpretation of all data errors. A "Find
Data Pattern" search mode can be programmed to automatically search
and locate specific data patterns as opposed to time intensive manual
searches. The Ancillary Data Analyzer may also be optimized to display
only specific data types, for example AES Audio packets or EDH data,
ensuring the display remains simple and easy to interpret. To help debug
buffer overflow problems in audio devices, the Ancillary Data Distribution
Analyzer provides real-time verification of the ancillary data distribution
pattern within a video frame.
SDI Waveform Mode
The
SDI Waveform mode further extends the capabilities of the VM700T SDI
option by providing a real-time display and analysis of the decoded
video waveform. Overlay, Parade and Stacked waveform displays of individual
video lines in equivalent analog form allows complete evaluation of
the video signal, including the ancillary data region, in a traditional
manner. Setup of digital sources is now as easy as if they were analog.
Waveforms can be displayed in either "Bar" style, similar
in look and feel to a logic analyzer display, or with interpolation,
providing a smoother analog look and feel. The "Bar" display
style is useful when using the user selectable sample cursors to provide
readouts of video sample values. Samples may be displayed in 8-Bit or
10-Bit mode in Hex, Binary or Decimal number base. Timing cursors may
be used to determine the exact timing of any two points on the video
waveform. The interpolated waveform mode is extremely useful for evaluating
the analog characteristics of the component digital signal. Pulse shape,
frequency response, insertion gain, rise and fall times and Inter-channel
timing of the decoded signal can be quickly assessed.
SDI Lightning Display
Pressing
the VM700T front panel Vector button selects the Tektronix-patented
Lightning display. The Lightning display helps operators quickly setup
color difference component recorders using only the color bar test signal.
Interchannel Timing
The
Interchannel Timing application is designed to quickly measure time
delay between two SDI sources or between one SDI source and the analog
black-burst reference input. Timing measurements are made in real-time
and in-service without special test signals. An easy to read auto-scaling
display indicates time delay in time or video frames.
Audio-to-video Delay
The
irritating time delay that accumulates between the audio and video content
of a television program during signal transport or the post-production
process can be extremely difficult to quantify. Subjective analysis
requires skilled operators and is seldom accurate to more than a single
video frame. The VM700T SDI Audio-to-video Delay application provides
a simple, out-of-service measurement solution to this problem. Simultaneous
audio and video test signals, available from the Tektronix TG2000 Signal
Generator, sent through the system under test, are received by the VM700T
SDI analyzer module and decoded. Up to plus or minus 2.5 seconds of
time delay can be measured between the special audio and video test
sequence. Time delay is indicated in video frames and milliseconds and
displayed on an easy to read bar graph. Measurements are made on embedded
or AES audio signals and a relative-to-reference mode allows normalizing
to any delay.
SDI Wander
Video
sync timing "wander" is a common problem with video that has
been transported over a digital distribution network. Subtle shifts
in picture hue or, in extreme cases, temporary picture unlock, can result
if variations in the horizontal sync frequency timing is not held to
within acceptable limits. The VM700T SDI Wander application provides
a simple and efficient method for the verification of SDI frequency
timing stability for contribution quality video applications. No special
test signals are required. Absolute frequency offset and frequency drift
rate measurements are made directly on the SDI signal. Accurate frequency
measurements to within 100 ppb can be made. Display limit markers indicate
peak Frequency Offset in ppm and Hz @ Fsc over the past 17 seconds.
Frequency Drift-rate measurements are reported in ppm/sec and Hz/sec
@ Fsc.
Digital Audio Measurements
The
VM700T SDI analyzer option includes a Digital Audio measurement application.
Audio level, audio frequency, total harmonic distortion plus noise,
level difference and Inter-channel phase of the AES digital audio or
embedded digital audio signal can be measured. An easy-to-read display
automatically updates all audio measurement results, clearly indicating
violations of user programmable limits and audio bit activity. For precise
error documentation, logging mode may be enabled with Linear Time Code
time-stamping capability. For a more detailed analysis of the digital
audio signal the Audio Format Analyzer may be selected. The Audio Format
Analyzer provides a waveform display of two digital audio channels,
in addition to analysis of audio channel status, decoding of user data
bits, identification of parity errors, code violations and invalid samples.
Picture Mode
Picture
mode allows a quick visual verification of the SDI signal source. A
bright-up line select feature helps finding any desired video line for
testing. Additionally, a relative-to-reference mode is included that
displays the differences between the active picture and a stored picture,
including differences outside the active video region.
Specifications
Input
Specifications Channel A
Physical - 2 BNCs (loop-through).
Electrical -
Input Impedance: 75 Ohm.
Return Loss:
> 25 dB from 1 - 360 MHz, channels on or off,
power on.
> 15 dB from 1 - 360 MHz, channels on or off,
power off.
Insertion Loss: > 0.2 dB from 1 to 360 MHz.
Channel B
Physical - 1 BNC (terminated).
Electrical -
Input Impedance: 75 Ohm.
Return Loss:
> 25 dB from 1 - 360 MHz, channels on or off,
power on.
> 15 dB from 1 - 360 MHz, channels on or off,
power off.
Channels A & B
Signal -
Format: 143 Mbit, 270 Mbit and 360 Mbit Serial Digital Video
per SMPTE 259.
Clock Tolerance: ±20 ppm.
Launch Amplitude: 800 mV ± 20% OR.
Cable Loss: 19 dB loss at 135 MHz wrt 800 mVp-p
launch amplitude.
SDI-out
Physical - 1 BNC.
Electrical -
Input Impedance: 75 Ohm.
Return Loss:
> 25 dB from 1 - 360 MHz, channels on or off,
power on.
> 15 dB from 1 - 360 MHz, channels on or off,
power off.
Signal -
Format: 143, 270, Serial Digital Video per SMPTE 259.
Clock Tolerance: No worse than selected input signal.
Analog Black-Burst
Physical - 2 BNCs (loop-through).
Electrical -
Input Impedance: 75 Ohm.
Return Loss: > 30 dB from 1 - 6 MHz, power on
or off.
Signal -
Format: 525/625 line analog composite video.
Input Amplitude: ±6 dB wrt. 1 Vp-p
video.
AES-in
Physical - 1 BNC.
Electrical -
Input Impedance: 75 Ohm internally terminated.
Return Loss: > 15 dB from 0.1 - 6 MHz, power on
or off.
Signal -
Format: 41 kHz, 44 kHz and 48 kHz AES3 digital stereo audio
per SMPTE 276.
LTC
Physical - 1 Mini-XLR.
Electrical - Input Impedance:
20 kilohm internally terminated.
Signal -
Format: Longitudinal Time.
Code per IEC pub. 461.
Speed Range: 0.5x to 5x real-time.
Measurement Performance Eye Diagram
Amplitude
Measurements -
(AC coupled) (averaged)
Range: 80 mV-1.0 V.
Amplitude Accuracy: ±5% @ 800 mVp-p.
Rise-time
Measurements -
Accuracy: ±100 ps for signals with rise-times of
400 ps-1.5 ns.
Aberrations: <10%, 800 mVp-p step.
Timing
Measurements -
Cursor Accuracy: 0.1 ppm ±20 ps.
Resolution: ± 40 ps.
Jitter
High-pass Filtering - 10 Hz ,1 kHz.
Jitter Measurement
Demodulated
Waveform - Bandwidth: 10 Hz to 10 MHz.
Range
(P-P) - 2 UI (4 ns @ 270 Mbit), 50 Hz
to 10 MHz, 5 UI at 10 Hz linearly decreasing
to 2 UI at 50 Hz.
Accuracy
(RMS) - 10% measured on sinusoidal jitter freq 10 Hz
to 10 MHz.
Numeric
Resolution - 20 ps.
Jitter
High-pass Filtering - 10 Hz, 1 kHz.
SDI Wander Measurement
Nominal
Input Freq. - 143 Mbit, 270 Mbit and 360 Mbit.
Tolerance
- ± 3%.
Frequency
Offset Accuracy - ±0.1 ppm.
Drift
Rate Accuracy - ±5 ppb/sec.
SDI Inter-Channel Timing
Digital
to SDI Analog Ref Input -
Accuracy: 400 ns.
Maximum delay: 1 frame (digital always assumed to be behind analog).
Digital
to Digital - (SDI channel A input to SDI channel B input)
Accuracy: ±1 sample.
Maximum delay: 1 frame.
Audio-to-video Delay
Accuracy and Resolution - 200
µs.
Ordering Information
TEK VM700T Serial Digital Video
Measurement Set
Opt. 1S and 2S Ordering Instructions
To
order a new VM700T with Serial Digital Video measurement capability
order a VM700T with Opt. 1S.
Note:
As a minimum, all new VM700Ts must be ordered with either or
both analog Opt. 01 (NTSC) or Opt. 11 (PAL) installed.
To upgrade an existing VM700T (serial numbers B020100 and above)
to Serial Digital Video measurement capability order a VMUPG Opt.
1S.
To upgrade an existing VM700T (serial numbers below B020100), and
any Turbo version VM700A to Serial Digital Video measurement capability,
order a VMUPG Opt. 2S.
To upgrade a standard VM700A with serial numbers B022000 and higher,
to Serial Digital Video measurement capability order a VMTB Opt.
2S.
MetricTest
Solutions
