Atec VM700T User Manual

Recognized with eight technical Emmy awards and one Oscar for outstanding contributions to the television industry, Tektronix world class core competencies have enabled it to design and deliver the most comprehensive solutions in the industry.

The VM700T is a product of this core competency. Recognized as the defacto industry standard that keeps pace with evolving customer needs, the VM700T is a total solution for your baseband video and audio measurement needs. Features such as an extremely fast and fully automatic measurement mode as well as full manual oper-

ovides the first time user

ation as well as the seasoned professional an unequaled value for their test and measur

Automatic video measur

The VM700T Auto mode makes standard video transmitter mea-

ements quickly and automati

sur cally, including those specified in RS-250C/EIA-250C, NTC-7 and RS170A. Both vertical interval and full field measur be made and compar

Option 40 audio measurement package.

monitoring and

ement investment.

ement set

ements can ed with

ektr

VM700T (turbo) Video Measurement Set Option 01 NTSC Video Measurements

Many capabilities in one instrument – Digital waveform monitor – Digital vectorscope – Picture Display – Group delay and frequency

response – Noise measurement set – Automatic measurement set

Auto mode – Unattended monitoring of NTSC

video signals from studios, STLs,

Earth Stations, and transmitters – User-specified limits

Measure mode provides graphic display of measurements

user-defined limits. A dual limit verification system is employed to generate a caution or alarm message when either limit is violated. Reports can be generated and printed automatically at operator scheduled times or triggered from a conditional event.

Graphic displays of measurements

Measur real time graphic displays of measurement results automatically. Vertical interval or full field measurements including noise spectrum, group delay, K-factor, differential gain and differential phase are presented as clever interactive digital displays. Such displays ar extremely fast measurement update rates (up to 30 times a second) ar instant feedback of critical adjustments and analysis of signal variations. User definable limits ar

into each graphic display and

can be used to trigger ment report or a user definable macro function. Such a function can, for example, dial out through

e mode pr

, easy to understand

e visually integrated

ovides virtual

e indispensable when

e required to provide

a measur

– ICPM – K factor – Differential gain and phase – Chrominance to luminance delay – Noise spectrum – Group delay with sin x/x – Color bars – Relative to reference on most

measurements

– Configurable for all standard

test signals

Award winning user interface

State-of-the-art architecture

Extremely fast update rate

Parallel and serial printer ports

Three input channels

Channel difference modes

nal VGA display port

Exter

Fully documented r operation

dcopy for analysis and

Har documentation

emote contr

a modem to report measurement results or control a signal router. A relative to reference mode

llows normalizing to a signal

a source or eliminate signal path errors from the desired measurement. Up to 2 video

eferences can be stored in

r NVRAM. Additionally, after downloading to a PC through the VM700T FTP driver, the video reference can be uploaded to

nother VM700T for reuse. A

a running averaging mode can be used to reduce the effect of noise. When additional measurement data is required a user can custom configure measurement parameters and report format.

A powerful Test Signal search capability quickly and automatically locates and identifies valid test signals required for a selected measurement, eliminating the annoying and time consuming task of manually locating test signals.

Digital waveform monitor/ vectorscope

The VM700T Waveform mode application provides real time graphics displays of the video signal allowing many additional measurements to be made manually. Easy to use measurement cursors are available to measure time, frequency and amplitude parameters of a video signal. These cursors allow a very quick and precise location of the 10%, 50% and 90% points on any transition. Cursor mode also employs an automatic calculation in the wave shape in the center of the display. The parameters calculated are sine peak-to-peak amplitude, frequency, and offset from blanking level. This is very useful for

equency response measur

ements

with the Multiburst signal.

The waveform display can be expanded ar

ound any point both vertically and horizontally. Since the data is digitized, the display

emains bright and easy to ready

r at all expansion factors. The scales automatically expand with the waveform, so all units are

ect as displayed. A channel

cor difference mode (A-B, A-C, B-A, B-C, C-A, and C-B) is also pr

ovided.

A screen memory selection

enables Envelope mode, which is useful for looking at teletext, Jitter, or other changes over time.

Vector mode provides the normal vectorscope display. The vectors

ay be rotated or expanded,

m with the rotation angle and gain values displayed numerically on the screen.

A unique “Find ColorBars” feature searches all video for ColorBars and displays the

ectors if found. The vectors can

v be referenced to either the selected channel’s burst or the burst of one of the other two channels or continuous subcarrier. The phase difference between the selected channel and the reference is always displayed.

Select Line in both Waveform and Vector modes can be used to quickly specify any line for display or automatic measurement if it is the proper signal.

Picture mode

The signal source can be quickly verified using the picture display. Additionally, a “bright-up” line select mode allows a user to select any video line for use in Measure mode or for viewing in Waveform or Vector mode.

User programmable functions

Function mode is an extremely powerful feature that allows a user to store a sequence of user operations as a macro function for later “playback.”

For example, a set of measure

ments (complete with hardcopy commands) to be made on a transmitter demodulator video output, could be stored as a function labeled “DEMOD.” The function “playback” could then be initiated manually, remotely or completely automatically as a user specified timed event. Function files can be stor

ed as a text file on a PC for editing, copying or uploading to another VM700T. Other function capabilities include controlling of external serial devices such as video/audio routers, switchers, signal generators, telephone modems and many other devices which

t RS232 communications.

suppor

Hardcopy

All information on the screen may be printed in high resolution graphics on printers supporting

ostScript

Hewlett-Packard

LaserJet™, DeskJet™, and ThinkJet™, or 24-pin Epson

graphics via the Centronics

ompatible parallel port or

tandard RS-232C interface.

Automatic measurement results

n text format can be printed on

i most ASCII printers using the parallel or serial ports.

Remote Operation

The VM700T has a powerful and fully documented remote control language. The VM700T can thus be operated from a remote terminal via RS-232C to monitor unattended transmission systems. In addition, all files can be uploaded to a main computer, and downloaded to other VM700Ts. Two different protocols are supported: FTP (File Transfer Protocol) and TELNET

. The user can also select a “no protocol” mode of the RS-232C interface when dealing with low baud rates. However, file transfers can only take place with FTP.

Specifications

The performance requirements cited in this section are valid only within the following environmental limits:

emperatur

e range of 0 to 50 degrees Celsius, with a minimum warm-up time of 20 minutes. The following tables list each measurement and its

formance requirement.

per

The range specifies the extremes between which a measurement can be made.

All measurement accuracies specified ar

e valid only with nominal input signals of 1 volt

6 dB) with an unweighted

pk-pk ( signal-t-noise ratio of at least 60 dB on the incoming signal and a termination accuracy of

onix PN 011-

0.025% (T

ektr

0102-01 or equivalent).

0.5

0.0

Volts

ound-In-Sync On

recision Mode Off

F2 L16

F2 L17

MicroSeconds

20.0 40.0 60.0 80.0 100.0 120.0

Sync = SourceSync = Source

00.0

0.0

IRE:FLT

rames selected:

11 22

525 line NTSC525 line NTSC Synchronous Synchronous S

low clamp to 0.00 V at 6.72 uS

No Filtering No Filtering

PL = 56.3%

Center L

eft

Center L

eft

Lock L

eft

Lock L

eft

Center R

ight

Center R

ight

Lock R

ight

Lock R

ight

Reset C

ursors

Reset C

ursors

Reset D

iffs

Reset D

iffs

Cursors S

tay On

Cursors S

tay On

Sinewave at middle of screen is too small or frequency too low for measurement. Sinewave at middle of screen is too small or frequency too low for measurement.

0.0

-0.2

Volts

Sound-In-Sync On Sound-In-Sync On Precision Mode OffPrecision Mode Off

ime from L to R: 4.664 MicroSeconds

Frequency (1/T): 0.214389 MHzFrequency (1/T): 0.214389 MHz

F2 L17

icroSeconds

-2.0 -1.0 0.0 1.0 2.0 3.0 4.0 5.0 6.0

Sync = SourceSync = Source

0.0

20.0

-40.0

IRE:FLT

ertical delta: -0.243 Volts

rames selected:

11 22

525 line NTSC525 line NTSC Synchronous Synchronous S

low clamp to 0.00 V at 6.72 uS

No Filtering No Filtering

APL = 52.7% APL = 52.7%

Field T

oggle

Field T

oggle

Find Colorbars

Vector Line

Field 1 Line 17

Field 1 Line 18

R-Y

B-Y

75%

100%

-I

-Q

Setup 7.5%

APL = 42.4% APL = 42.4%

System LineSystem Line Angle (deg) 0.0Angle (deg) 0.0 Gain x 1.178Gain x 1.178

1.425 dB1.425 dB

L 20 F2L 20 F2

urst from source

25 line NTSC

R-Y

B-Y

75%

100%

-I

-Q

Setup 7.5%

Auto Scan

ExitExitManual

Steps 6

Manual Steps 6

RefPacket

6.7uSec

RefPacket

6.7uSec

1st Step

10.7uSec

1st Step

10.7uSec

Last Step

25.8uSec

Last Step

25.8uSec

Measure Cycles 6

Measurement Location for the DGDP MeasurementMeasurement Location for the DGDP Measurement

u secu sec

5.0 10.0 15.0 20.0 25.0 30.0 35.0 40.0 45.0 50.0 55.0 60.05.0 10.0 15.0 20.0 25.0 30.0 35.0 40.0 45.0 50.0 55.0 60.0

Field = 1 Line = 16 FCC Composite

ertical interval test signals can be seen very clearly for additional analysis of the signal.

V These can be printed as support documentation for automatic measurement results.

In Vector Mode, the VM700T becomes a digital vectorscope with an electronic graticule. A “Color Bar Search’’ feature makes it easy to quickly display a line containing a color bar test signal.

ven a single horizontal synchronization pulse can be displayed at a high intensity.

Main Measure Mode display of available measurements.

Picture Mode display. (Video courtesy of KOIN-TV, Portland, Oregon.) Measure Mode DGDP special position acquisition feature.

0.0

10.0

20.0

30.0

40.0

0.0

60.0

70.0

80.0

90.0

100.0

10.0

120.0

0.0

10.0

20.0

30.0

40.0

0.0

60.0

70.0

80.0

90.0

100.0

10.0

120.0

Bar & LineTime (NTSC) Wfm --> Bar & LineTime (NTSC) Wfm -->

100 % = Bar Level100 % = Bar Level

FCC Composite

2 -> 32

ar Level = 93.5 IRE (Ref. b1)

Bar Level = 93.5 IRE

(Ref. Back Porch) Sync Level = 35.8 IRE Sync to Bar Top = 129.3 IRE Sync/Bar Ratio = 95.8 %

(100% = 4/10) LineTime Dist. = 1.8 %

(

Rec. 567)

Bar Tilt = 1.2 %

(Rec. 569) Bar Width = 18.0 u sec

Field = 1 Line = 16 Field = 1 Line = 16

verage

Average Num 32

Relative

to Ref

Relative

to Ref

ReferenceReference AcquireAcquire VITS

VITS Search

RescaleRescale

Chroma Gain (%)Chroma Gain (%)

Chroma Delay (n sec)Chroma Delay (n sec)

80.0

85.0

90.0

95.0

100.0

105.0

110.0

115.0

-60.0 -40.0 -20.0 0.0 20.0 40.0 60.0

80.0

85.0

90.0

95.0

100.0

105.0

110.0

115.0

-60.0 -40.0 -20.0 0.0 20.0 40.0 60.0

Chrom/Lum Gain Delay (NTSC) Wfm --> Chrom/Lum Gain Delay (NTSC) Wfm --> FCC Composite

32 -> 32

Field = 1 Line = 16 Field = 1 Line = 16

Average Average

Chroma Gain = 85.3 % Chroma Delay = 9.3 n sec

MEASURE MODE

BAR LINE TIME

bsolute Relative

easurement Range Mode Mode

ar Level 50 to 200 IRE ±0.5% ±0.2%

ync Level 20 to 80 IRE ±0.5% ±0.2%

ync to Bar Top 70 to 280 IRE ±0.5% ±0.2%

Sync/Bar Ratio 10% to 125% ±0.5% ±0.2%

00% nominal

Bar Tilt (Rec 569) 0 to 20% ±0.2% ±0.1%

Line Time Distortion 0 to 20% ±0.2% ±0.1%

Rec 567)

(

Bar Width 10 µS to 30 µS ±100 nS NA

ccuracy Accuracy

HROMINANCE TO LUMINANCE GAIN AND DELAY

bsolute Relative

Measurement Range Mode Mode

ccuracy Accuracy

Chrominance to Luminance Delay ±300 ns ±5 ns ±1.0 ns

Chrominance to Luminance Gain Ratio 0 to 160% ±1.0% ±0.1%

hrominance to Luminance Gain and Delay measurement.

Bar Line Time measurement.

BOUNCE

Measurement Range Accuracy

Peak Deviation 0 to 50% ±1%

Settling Time 0 to 10 sec ±100 msec

BURST FREQUENCY

Measurement Range Relative Mode Accuracy

Burst Frequency Error ±100 Hz ±0.5 Hz

All accuracies for measur

All accuracies for measurements with relative to reference mode assume an average of 256 was used to

eate the r

Requires a reference signal.

ence.

efer

ements with averaging capabilities assume the default average of 32.

CHROMINANCE FREQUENCY RESPONSE

Measurement Range Mode Mode

Reference Amplitude 0 to 100 IRE ±1% ±0.5%

Frequency Response 0 to 100 IRE ±1% ±0.5%

Absolute Relative

Accuracy Accuracy

CHROMINANCE NOISE

Measurement Range Absolute Mode Accuracy

AM Noise –20 to –80 dB ±1 dB (–20 to –60 dB)

PM Noise –20 to –70 dB ±1 dB (–20 to –60 dB)

MEASURE MODE (continued)

Chrominance Amplitude Error (%) Ref = 40 IRE PacketChrominance Amplitude Error (%) Ref = 40 IRE Packet

Chrominance Phase Error (deg) Ref = 40 IRE PacketChrominance Phase Error (deg) Ref = 40 IRE Packet

Chrominance Luminance Intermodulation (% of 714 mV)Chrominance Luminance Intermodulation (% of 714 mV)

20 IRE20 IRE 40 IRE40 IRE 80 IRE80 IRE

-0.06

-0.04

-0.02

0.00

0.02

0.04

-0.06

-0.04

-0.02

0.00

0.02

0.04

-0.04

-0.02

0.00

-0.04

-0.02

0.00

0.05

0.10

0.00

0.05

0.10

hrominance Nonlinearity (NTSC) Wfm -->

hrominance Nonlinearity (NTSC) Wfm --> NTC-7 Combination

56 -> 256

Field = 1 Line = 16 Field = 1 Line = 16

verage

-0.0 0.0 -0.1

0.0

0.1 0.0 0.0

Luminance Level (IRE)Luminance Level (IRE)

Chrominance Level (IRE)Chrominance Level (IRE)

Chrominance Phase (deg)Chrominance Phase (deg)

Gray Gray Yellow Yellow Cyan Cyan Green Green MagentaMagenta Red Red Blue Blue Black Black

0.0

50.0

100.0

0.0

50.0

100.0

0.0

50.0

100.0

0.0

50.0

100.0

0.0

100.0

200.0

300.0

400.0

0.0

100.0

200.0

300.0

400.0

ColorBar (NTSC) Wfm --> ColorBar (NTSC) Wfm --> FCC Color Bar

32 -> 32

Field = 2 Line = 20 Field = 2 Line = 20

Average Average

94.0 68.0 55.8 48.7 37.0 29.5 16.9 9.3

0.4 49.9 73.6 68.6 70.1 77.3 53.9 0.5

------- 168.3 283.6 241.1 60.0 103.5 346.1 -------

Differential Gain (%)Differential Gain (%)

Differential Phase (deg)Differential Phase (deg)

1st. 1st. 2nd. 2nd. 3rd. 3rd. 4th. 4th. 5th.5th. 6th. 6th.

-15.0

-10.0

-5.0

0.0

5.0

-15.0

-10.0

-5.0

0.0

5.0

-0.4

-0.2

-0.0

0.2

0.4

-0.4

-0.2

-0.0

0.2

0.4

DG DP (NTSC) Wfm --> DG DP (NTSC) Wfm --> FCC Composite

2 -> 32

Field = 1 Line = 16 Field = 1 Line = 16

verage

0.00 -0.61 -2.40 -5.40 -8.14 -12.18

min =-12.18 max = 0.00 p-p/max = 12.18

0.00 0.29 -0.11 -0.21 0.23 0.21

min = -0.21 max = 0.29 pk-pk = 0.50

CHROMINANCE NON-LINEARITY

easurement Range Mode Mode

hrominance Amplitude 0 to 100% ±0.4% ±0.2%

hrominance Phase 0 to 360 deg ±1 deg ±0.2 deg

hrominance to Luminance –50 to +50% ±0.2% ±0.2%

ntermodulation

bsolute Relative

Accuracy Accuracy

MPTE COLOR BARS NOMINAL VALUES

olor LUM (mV) Chroma P-P (mV) Phase (degrees)

ellow 494.6 444.2 167.1

yan 400.4 630.1 283.4

reen 345.9 588.5 240.8

agenta 256.7 588.5 60.8

Red 202.2 630.1 103.4

Blue 108.1 444.2 347.1

IFFERENTIAL GAIN AND PHASE

bsolute Relative

Measurement Range Mode Mode

Accuracy Accuracy

Differential Gain 0 to 100% ±0.3% ±0.03%

Differential Phase 0 to 360 deg ±0.3 deg ±0.03 deg

Chrominance Non-Linearity measurement.

COLOR BAR

Measurement Range Mode Mode

Luminance Level 0 to 100 IRE ±0.5 IRE ±0.2%

(0 to 714.3 mV)

Chrominance Level 0 to 100 IRE ±1.0% of ±0.2% (excluding gray and black) (0 to 714.3 mV) nominal

Chrominance Phase ±180 deg of ±0.5 deg of ±0.1 deg

nominal nominal

Color Bar measurement.

Accuracies for chrominance non-linearity amplitude and phase measurements assume an average of 256.

Absolute Relative

Accuracy Accuracy

Differential Gain and Phase measurement.

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