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Specifications
1–6
1780R-Series Service Manual
Table 1–2: Waveform Monitor Vertical System (Cont.)
Characteristic
Performance
Check Step
Supplemental InformationPerformance Requirement
DC Restorer
Clamp Point Backporch or Sync Tip.
(All clamps controlled together.)
21
Mains Hum Atten.
Slow Clamp ≤0.9 dB. Attenuation ≤10%.
22
Fast Clamp ≥26 dB.
Shift caused by presence or absence
of burst
NTSC = 1 IRE.
PAL = ≤7 mV.
24
Lum/Chroma Gain Ratio
NTSC (50 kHz – 3.58 MHz) 1:1 ±1%.
Ad
ju
s
t
ed
to
m
ini
m
iz
e
lu
m
inanc
e
r m e err r 1
1
9
PAL (50 kHz – 4.43 MHz) 1:1 ±1%.
to ch
r
o
m
inanc
e
gain
err
o
r
at
1
V
Full Scale, typically ≤0.5%.
DC Channel Matching Typically within 30 mV. 8
Common Mode Rejection AB1 B1B2 / B1B3
1
V p
e
ak
-
to
-
p
e
ak co
mm
on
m
o
de
s.
26
60 Hz ≥46 dB ≥46 dB
s
ignal
.
15 kHz (Lum) ≥46 dB ≥46 dB
1 MHz ≥40 dB ≥34 dB
3.58 or 4.43 MHz (Chroma) ≥34 dB ≥34 dB A – B1 typically >46 dB to
6.0 MHz and >40 dB to 10.0 MHz.
Filters
Luminance <3 dB down at 1 MHz. ≥40 dB
down at 3.58 or 4.43 MHz.
Low Pass ≥14 dB down at 500 kHz. Typically –3 dB at 300 kHz.
Chrominance
3.58 MHz ±1% of flat at 3.58 MHz.
3 dB points:
Lower: 2.83 ±0.15 MHz.
Upper: 4.33 ±0.15 MHz.
2
0
4.43 MHz ±1% of flat at 4.43 MHz.
3 dB points:
Lower: 3.68 ±0.15 MHz.
Upper: 5.18 ±0.15 MHz.