Operating Instructions
2–8
1720/1721
OPERATOR’S CHECKOUT PROCEDURE
The following procedure is provided as an aid in obtaining a display on the
1720/1721 Vectorscope, and may be used as a check of basic instrument
operation. Only instrument functions are checked in this procedure. All checks
can be made with a cabinet on and it is necessary to have all internal jumpers in
the factory-set position.
When a complete check of the instrument performance to specification is
desired, a qualified service technician should make the Performance Check in
Section 5 of this manual.
This procedure requires a source of composite video and composite sync signals.
A TEKTRONIX 1410 Series Television Test Signal Generator mainframe with
Sync, Color Bar, and Linearity modules was used in preparing this procedure.
1. Initial Setup
1720/1721 Vectorscope
MODE VECT
REF INT
INPUT CH A
VARIABLE off
BARS 75%
PAL/+V PAL (1721 only)
PHASE Will be set later
FOCUS Will be set later
SCALE Counterclockwise
INTENS Counterclockwise
POWER OFF
Connect the color bar signal to the CH-A INPUT and terminate the remaining
side of the loop-through input with a 75Ω termination. Connect the modulated
staircase signal to the CH-B INPUT, then loop through to the EXT REF and
terminate in 75Ω. See Figure 2-3.
Set up the signal sources for the following composite video signals:
Full Field Color Bars
75% Ampl. 7.5% Setup –– NTSC
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