Atec TSG90 User Manual

Service Manual

TSG 90 PATHFINDER NTSC Signal Generator

070-8706-01

Warning

The servicing instructions are for use by qualified personnel only. To avoid personal injury, do not perform any servicing unless you are qualified to do so. Refer to all safety summaries prior to performing service.

Specifications

Introduction

The material in this section is organized into two main groupings: the specification tables and the supporting figures. The specification tables include:

H NTSC general signal characteristics and test signal specifications. H Signal level specifications. H Power supply, physical, and environmental specifications.

The supporting figures (waveform diagrams and related data) follow the specification tables.

Reference Documentation

The following documents were used as references in the preparation of this specification:

Product Classification Environmental Test Summary, 13 June 1977; Tektronix Standard 062-2853-00

Electromagnetic Compatibility Environmental Test, 31 March 1977; Tektronix Standard 062-2866-00

Recommendations and reports of the CCIR, 1978; Transmission of Sound Broadcasting and Television Signals Over Long Distances (CMTT)

IEEE Standard Dictionary of Electrical Terms, Second Edition (1977); IEEE Standard 100-1977

Safety Standard for Electrical and Electronic Test, Measuring Controlling and Related Equipment, February 1988; ANSI/ISA-S82.01

International Electrotechnical Commission Standard “Safety Requirements for Electronic Measuring Apparatus;” IEC 348

Canadian Standards Association Electrical Standard for Electrical and Electronic Measuring and Testing Equipment; CAN/CSA C22.2 No. 231

Standard for Electrical and Electronic Measuring and Testing Equipment, Second Edition, July 21, 1980

TSG 90 PATHFINDER Service Manual 1–1

Specifications

Performance Conditions

The Performance Requirements are valid within the environmental limits shown in Table 1–7 if the instrument is calibrated in an ambient temperature of 23° C, after a warm-up time of 20 minutes.

Safety Standards

The following safety standards apply to the TSG 90:

H ANSI/ISA-S82.01 H IEC 348 H CAN/CSA C22.2 No. 231 H UL 1244

NOTE. Shielded cables were used in the certification of this instrument; therefore, shielded cables are recommended to be used when operating. (EC 92)

1–2 TSG 90 PATHFINDER Service Manual

Specification Tables

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T able 1–1: General Video Test Signal Characteristics

Specifications

Characteristic

Luminance Amplitude Accuracy Chrominance-to-Luminance Gain Blanking Level Rise Time Accuracy Burst Amplitude Sync Amplitude Sync Rise Time Output Impedance Return Loss Subcarrier Stability

Signal-to-Noise Ratio

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Chrominance-to-Luminance Delay

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SCH Phase Frequency Response Field Tilt Line Tilt 5-Step Linearity Error Differential Gain Differential Phase 2T Pulse K-Factor Luminance Rise Time Chrominance Rise Time Burst Rise Time Line Timing Front Porch Duration Line Blanking Interval

Breezeway Duration Line Sync Duration Vertical Serration Duration Equalizing Pulse Duration Burst

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Delay from Sync Duration

Performance Requirements

± 1% of 714.3 mV (100 ± 1 IRE) ± 2% of 714.3 mV (100 ± 2 IRE) 0 V ± 50 mV ± 10%

285.7 mV (40 IRE) ± 2%

285.7 mV (40 IRE) ± 2% 140 ns ± 20 ns

3.579545 MHz ± 10 Hz

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≤ 15 ns

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0° ± 5° Flat within ± 2% to 4.2 MHz

≤ 0.5% ≤ 0.5% ≤ 1% ≤ 1% ≤ 1° ≤ 0.5%

Digitally derived Digitally derived Digitally derived Digitally derived Digitally derived Digitally derived

Digitally derived Digitally derived Digitally derived Digitally derived Digitally derived

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Supplemental Information

1% typical.

Except where otherwise specified

75 Ω ≥ 36 dB at 4.2 MHz Over a temperature range of 0 to +45 °C. Annual

adjustment required. ≥ 60 dB; Signal passed through a continuous

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random noise measurement low pass filter, Fc=5

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MHz. 10 ns typical. Measured with the NTC7 Composite

signal.

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Relative step matching.

Ringing ≤ 1.5% peak. 250 ns ± 25 ns, except where otherwise specified. 400 ns ± 40 ns, except where otherwise specified. 400 ns ± 40 ns See Figures 1–1 through 1–16

1.5 µs ± 0.1 µs

10.9 µs ± 0.2 µs; measured at the 20 IRE point of active video.

600 ns ± 100 ns

4.7 µs ± 100 ns (at half-amplitude)

2.3 µs ± 100 ns (at half-amplitude)

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5.308 µs ±35 ns (19 cycles of subcarrier)

2.51 µs ± 0.1 µs (9 cycles of subcarrier)

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TSG 90 PATHFINDER Service Manual 1–3

Specifications

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T able 1–2: Video Test Signals

Characteristic

SMPTE Bars

Performance Information

See Figure 1–1

Rise Times

Luminance

140 ns ± 25 ns

Chrominance

–I Q

250 ns ± 25 ns 833 ns ± 80 ns

Field Timing

Color Bars Reverse Blue Bars IYQB

Lines 21–182; See Figure 1–1a Lines 183–202; See Figure 1–1b Lines 203–262; See Figure 1–1c

Luminance Amplitude Subcarrier Amplitude Subcarrier Phase

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White

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Y ellow

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Cyan

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Green

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Magenta

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Red

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Blue

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–I

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Q

75% Color Bars

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(Pedestal, mV) (peak–to–peak, mV) (degrees)

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549.1 00.0 00.0

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492.6 443.3 167.1

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400.9 626.6 283.5

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344.5 585.2 240.7

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258.2 585.2 60.7

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201.7 626.6 103.5

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110.1 443.3 347.1

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53.6 285.7 303.0

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53.6 285.7 33.0

Full Field Color Bars; 75% Amplitude, 7.5% Setup with a 100 IRE White Flag. See Fig-

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ure 1–2.

SNG Color Bars (Opt J only) SNB021565 & above

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Lines 21 – 163

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Lines 164 – 198 Lines 199 – 209

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Lines 210 – 162

Red Field

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Luminance Pedestal Chrominance Amplitude

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Chrominance Phase

(SIN X)⁄X

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Spectrum

5-Step Staircase

Amplitude

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0 IRE Flat Field (STD only) 50 IRE Flat Field

Amplitude

Black Burst

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Amplitude

1–4 TSG 90 PATHFINDER Service Manual

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30 IRE Flat Field

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Color Bars of 0 Setup SMPTE Color Bars IYQB of 0 Setup SMPTE Color Bars

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30 IRE Flat Field See Figure 1–3

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201.74 mV (28.3 IRE)

626.66 mV

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(87.8 IRE)

p-p

103.5° See Figure 1–4

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–3 dB at 4.75 MHz See Figure 1–5

714.3 mV (100 IRE)

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See Figure 1–6; 0 mV , no burst See Figure 1–7

357.2 mV See Figure 1–8

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53.57 mV (7.5 IRE)

Rev Apr 1994

T able 1–2: (Cont.)Video Test Signals

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Specifications

Characteristic

Field Square Wave

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Field Timing

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Lines (White) Lines at Blanking

Amplitude

Multiburst

Amplitudes

White Reference Bar Packets

Pedestal Burst Frequencies Packet Rise Time

0.5 MHz

All Other Packets

Convergence

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Amplitude

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Pattern Pulse HAD

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NTC7 Composite

Bar

Amplitude

Rise Time 2T Pulse

Amplitude

HAD

2

Modulated Sin

Pulse Phase Amplitude HAD

Modulate 5-Step Staircase

Luminance Chrominance

NTC7 Combination

Multiburst

Amplitudes

White Bar Packets

Pedestal Burst Frequencies Packet Rise Times

0.5 and 1.0 MHz

Performance Information

See Figure 1–9

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Lines 70–213

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All remaining active lines

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714.3 mV (100 IRE) See Figure 1–10

500 mV (70 IRE)

428.6 mV

(60 IRE), Equal width packets

p-p

285.7 mV (40 IRE)

0.5, 1.0, 2.0, 3.0, 3.58, and 4.2 MHz

140 ns typical (sine-squared shaped packets) 400 ns typical (sine-squared shaped packets) See Figure 1–11

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549.3 mV (76.9 IRE)

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Crosshatch: 14 horizontal lines and 17 vertical lines per field 225 ns ± 25 ns

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See Figure 1–12

714.3 mV (100 IRE) 125 ns ± 25 ns

714.3 mV (100 IRE) 250 ns ± 25 ns

60.8° ± 1°

714.3 mV (100 IRE), measured at peak amplitude

1.563 µs ± 150 ns

642.9 mV (90 IRE)

285.7 mV (40 IRE) See Figure 1–13

714.3 mV (100 IRE)

357.2 mV

(50 IRE)

p-p

357.2 mV (50 IRE)

0.5, 1.0, 2.0, 3.0, 3.58, and 4.2 MHz

140 ns typical (sine-squared shaped packets)

TSG 90 PATHFINDER Service Manual 1–5