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Performance Check and Calibration Procedures
TPG20 Service
1–11
f. Select H–PHASE on the TPG20 and rotate knob to verify that horizontal
phase can be adjusted at least 63.486 ns (±one half line). Return setting
to 0 ns.
9. Vertical Phase Adjustment – 1 Frame – NTSC
a. Use same test setup as step 8 except trigger the oscilloscope externally
with the TPG20 TRIGGER OUT signal.
b. Select V–phase on the TPG20 and rotate knob. Verify that vertical phase
can be adjusted at least one frame. Return setting to line 1.
10. Subcarrier Phase Adjustment – 360 degrees in steps of 1 degree – NTSC
a. Connect the TSG–170A Black Burst signal to the TPG20 REFERENCE
Input. Connect the other side of the loop through to the VM700A CH B
input.
b. Connect one of the TPG20 Analog B Outputs to CH A of the VM700A.
c. Set TPG20:
FORMAT 525/60 COMPOSITE NTSC/D2
Groups: BARS; SMPTE COLOR BARS 525 NTSC/D2
d. Set TPG20 to Genlock. Lock ON; SC – Phase
e. Set VM700A to Vector Mode – burst reference to CH B.
f. Set TPG20 to SC–phase, rotate knob and observe that VM700A vector
display is capable of being adjusted over the full 360 degrees. Return
SC –phase adjustment to 0.
11. Genlock PAL – Horizontal Phase Adjustment ±one half line.
a. Using the Black Burst signal of the TSG271 – loop through the
Reference Input of the TPG20 to CH 1 on the oscilloscope (terminated
into 75 W).
b. Connect one of the Analog B Outputs of the TPG20 to CH 2 of the
oscilloscope.
c. Trigger the oscilloscope internally off of CH 2.
d. Set TPG20:
FORMAT 625/50 COMPOSITE PAL/D2
Groups: BARS; EBU COLOR BARS 625 PAL/D2