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Specifications
1780R-Series Service Manual
1–7
Table 1–2: Waveform Monitor Vertical System (Cont.)
Characteristic
Performance
Check Step
Supplemental InformationPerformance Requirement
Diff Steps
(Differentiated Steps Attenuation) >40 dB at 3.58 MHz
(4.43 MHz PAL).
5 step, 20 IRE staircase within
2% of flat display.
Vertical Gain increase approx. 5X
to compare staircase risers.
27
Noise Measurements
Accuracy To 56 dB within 1 dB; 60 dB
within 2 dB.
Re
lativ
e
to 7
00
m
V
RMS
, Va
r
G
ain
set to maximum.
9
Offset Accuracy To 56 dB within 0.5 dB; 60 dB
within 1 dB.
Non-Linear Waveform Distortion
Differential Gain
Aux Video Out ≤0.25%, 10% – 90% APL. Waveform modes.
Pix Mon Out ≤0.25%, 10% – 90% APL.
Differential Phase
Aux Video Out ≤0.25°, 10% – 90% APL.
Pix Mon Out ≤0.25°, 10% – 90% APL.
Linear Waveform Distortion
Pulse Overshoot & Ringing ≤1% of applied pulse amplitude. Typically
<0.5% on T Pulse, and
<1.0% on T/2 Pulse.
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Pulse and Bar ≤1% of applied pulse amplitude. Typically
<0.5% on T Pulse, and
<1.0% on T/2 Pulse.
25 ms Bar Tilt ≤1% of applied bar amplitude.
Field Square Wave Tilt ≤1% of applied square wave
amplitude.
Typically <0.5%.
2T Sin
2
Pulse-to-Bar Ratio 1:1 ±1%.
Vertical Overscan
Baseline Distortion <7 mV variation in baseline of
chroma when positioned any-
where between sync tip and
100% white.
1 V p-p PAL or NTSC Modulated
Sin
2
composite video signal
(12.5T NTSC, 10T PAL). X1 or
X5, Variable Gain off. Typically
<0.5%.
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