Tektronix TPG20 Manuel d'utilisateur télécharger pdf (Page 17)

Performance Check and Calibration Procedures

TPG20 Service

1–5

Performance Check

1. Visual Inspection

a. Connect the TPG20 to a power source, and turn the power on.

b. Check – the front panel LCD contrast. The readout should be easily

visible under normal lighting conditions.

c. Check – all front panel controls, indicators and rear panel connectors

for functionality, appearance, and mechanical integrity.

2. Subcarrier Accuracy

NOTE. After initial delivery or long storage allow a two–hour warm up to re-age

the crystal. Thereafter, 30 minutes warm up is sufficient.

NTSC 3.579545 MHz  2 Hz

a. Set TPG20:

FORMAT – 525/60 COMPOSITE NTSC/D2

Groups; FLAT FIELDS; BLACK 525 NTSC/D2

(See Figure 1–1)

525/60 COMPOSITE

NTSC / D2

Groups:

BARS

BLACK

525 NTSC / D2 00

Search for

Format

Search for

Group

Search for

Pattern

SELECT

PATTERN

SELECT

PATTERN

SELECT

FORMAT

     

Step 1

Step 2

Step 3

Step 4

Figure 1–1: Basic steps to set the TPG20 output pattern

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 101 102

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Tektronix TPG20 Manuel d'utilisateur Page 17