SECTION I.
IDENTIFICATION AND DESCRIPTION
1. Test Instrument Identification.
This bulletin
2. Calibration Data Card, DA Form 2416. a. Forms,
provides instructions for the calibration of Automatic
records, and reports required for calibration personnel at
Video
Corrector,
Tektronix,
Model
1440.The
all levels are prescribed by TM 38-750. DA Form 2416
manufacturer's instruction manual was used as the
must be annotated in accordance with TM 38-750 for
prime data source in compiling these instructions. The
each calibration performed.
b. Adjustments to be reported on DA Form 2416 are
automatic video corrector will be referred to as the "TI"
(test instrument) throughout this bulletin.
designated (R) at the end of the sentence in which they
a. Model Variations. None.
appear. Report only those adjustments made and
b. Time and Technique. The time required for this
designated with (R).
calibration is approximately 4 hours, using the dc and low
frequency technique.
3.
Calibration Description.
Test instrument
parameters and performance specifications which
pertain to this calibration are listed in table 1.
Table 1. Calibration Description
Test Instrument Parameters
Performance Specifications
Timing
Verifies proper timing of oscillator, sync, and gating circuits.
Program compensation
Verifies proper function of gain control circuits in both "auto"
and "preset" modes.
Line time non-linear distortion
0.5% verified with differentiated unmodulated staircase.
Pedestal intermodulation
0.5 IRE units (3.6 mv) or less.
Chrominance and luminance delay
10 ns or less.
Signal delay
Introduces less than 5 degrees phase shift of burst signal.
Demodulator control
Verifies proper control of VIR signal to O-carrier
reference signal ratio.
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