Performance Check and Calibration Procedures
TPG20 Service 1–15
c. Check – WFM601i for correct video signal display. Repeat check for
the second TPG20 SERIAL DIGITAL OUTPUT.
19. Check PAL 625/50 Component Digital Serial
a. Set TPG20:
FORMAT 625/50 COMPONENT D1/YPrPb
Groups: BARS; EBU COLOR BARS 625 D1/YPrPb
b. Connect one of the TPG20 SERIAL DIGITAL OUTPUTs to the
WFM601i.
c. Check – WFM601i for correct video signal display. Repeat check for
the second TPG20 SERIAL DIGITAL OUT.
20. Serial Signal Integrity
a. Connect TPG20 SERIAL DIGITAL OUTPUT to the WFM 601i, using a
75 cable. Terminate the loop through in 75.
b. Check – that the SERIAL DIGITAL OUTPUT amplitude is 800 mV
±10%.
c. Adjust the WFM 601i Variable Vertical Gain so that the eye pattern
display is 10 divisions in height.
d. Check – that the rise time and fall time are > 0.75 ns and < 1.5 ns
(20% to 80%).
e. Check – that any overshoot is less than 10%.
21. Input/Output Return Loss: >36 dB up to 4.5 MHz
NOTE. The Return Loss Check only needs to be done if repairs have been made
on the Input circuitry.
a. Set TPG20:
FORMAT 525/60 COMPONENT YPrPb
Groups: FLAT FIELDS; BLACK 525 YPrPb
b. Connect a precision 50 cable to the spectrum analyzer RF Input, and
another precision 50 cable to the tracking generator output.
c. Connect the tracking generator Output cable to the RF Input on the RF
Bridge.