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Performance Check and Calibration Procedures
TPG20 Service
1–21
Table 1–1: Available TPG20 Crystal Options
Type
Frequency Usage Format
0 13.50 MHz 625/525 D1
1 17.73447 MHz PAL & SECAM 4fsc
2 14.318180 MHz NTSC 4fsc
3 14.328225 MHz PAL N 4fsc
4 14.3024 MHz PAL M 4fsc
5 18.56250 MHz 1125/60 & 1250/50
6 18.88116 MHz 1125/59.94 & 1050/59.94
7 N/A User defined
8 N/A User defined
9 N/A User defined
10 N/A Crystal not installed
b. Save the setting by pressing the SELECT button.
c. Repeat the setup for crystals 2 to 6. If no crystal is installed in the slot,
then set it to type 10.
5. Output Level Calibration
a. Set TPG20:
FORMAT 625/50 COMPONENT RGB
Groups: FLAT FIELDS; WHITE 100% 625 RGB
b. Connect the Video Calibrator, set to 1 volt chopped signal (VAC set to
999.9 mV), to both oscillocope channels, using the dual input connector.
Set the oscilloscope to 0.1 Volts/Div, invert one of the channels and sum
them. Adjust the variable gain on one channel to null the signal.
c. Connect the video calibrator to channel two of the oscilloscope, and
TPG20 Analog A Ouput (Y signal) to channel one. Retain all previous
settings, triggering the oscilloscope on channel two.
d. Press the TPG20 SYSTEM button to select – Set:625 GBR.
e. Adjust – the output level of the TPG20 using the front panel knob, so
that the bottom of sync of the top video trace coincides exactly with the
top of video on the lower video trace.
f. Press TPG20 SELECT button to save this setting.