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WFM90D and WFM91D Service Manual
Table 1- 5: Vector mode
Category Description
Chrominance Processing Nominal
Subcarrier Frequency (F
SC
)
REF: NTSC: 3.579545 MHz.
PAL: 4.43361875 MHz.
Chrominance Processing
Chrominance Bandwi dth
REQ: Upper --3 dB Point:
F
SC
+500 kHz,ᐔ100 kHz.
Lower --3 dB Point:
F
SC
-- 500 kHz,ᐔ100 kHz.
Chrominance Processing +V Mode
(Applicable to PAL operation only)
REF: +V-type display as selected by front-panel button. When pushed, V axis is inverted
at a 1/2 line rate to produce a single vector display.
Display Vector Phase
Accuracy
REF: ᐔ1.25°. Analog input only.
REF: Measured with color bar signal.
Display Vector Gain Stability
REF: Typically ᐔ2.5%. Analog input only.
Display Quadrature Phasing
REF: Typically ᐔ0.5°. Analog input only.
Display Differential Phase
REF: ᐔ1°. Analog input only.
REF: Measured with 140 IRE (1 V) linearity signal (5 step, 10 step, or Ramp) with 40 IRE
(300 mV) of subcarrier.
Display Differential Gain
REF: ᐔ1%. Analog input only.
REF: Measured with 140 IRE (1 V) linearity signal (5 step, 10 step, or Ramp) with 40 IRE
(300 mV) of subcarrier.
Subcarrier Regenerator Pull-In
Range
REQ: NTSC: ᐔ50 Hz of F
SC
.
PAL: ᐔ10 Hz of F
SC
.
REF: Subcarrier Regenerator free-runs in absence of appropriate signal. Reference can
be burst of either displayed signal or external reference signal.
Subcarrier Regenerator Pull-In Time REF: Pull-In Time: W ithin 1 second, wi th subcarrier frequency within 50 Hz (10 Hz for
PAL) of F
SC
.
Subcarrier Regenerator Phase Shift
with Subcarrier Frequency Change
REQ: NTSC: ᐔ2° from F
SC
to (F
SC
+50Hz),orF
SC
to (F
SC
-- 5 0 H z ) .
PAL: ᐔ2° from F
SC
to (F
SC
+10Hz),orF
SC
to (F
SC
-- 1 0 H z ) .
Subcarrier Regenerator Phase Shift
with Burst Amplitude Change
REQ: ᐔ2° from nominal burst amplitude to ᐔ6 dB.
REF: Internal or External burst reference.
Subcarrier Regenerator Phase Shift
with Variable Gai n Control
REQ: ᐔ1° as gain is varied from +3 dB to --6 dB.
Subcarrier Regenerator Phase
Control Range
REF: 360° continuous rotation.
Subcarrier Regenerator Burst Jitter REF: 0.5° RMS or less.
REF: With 140 IRE (1 V) composite video input. INT or EXT referenced.