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Specifications
1–8
WFM 90 and WFM 91 Service Manual
Table 1–4: Horizontal deflection system
Category Description
Sweep REQ: Sweep will occur in all horizontal mode settings with or without synchroniza-
tion.
REF: Sweep Length: Two Line and Two Field sweep length is nominally
12 divisions.
1LINE Sweep Repetition Rate REQ: Equal to line rate of applied video or external sync.
2LINE Sweep Repetition Rate REQ: Equal to half line rate of applied video or external sync.
2FLD Sweep Repetition Rate REF: Displays 2 full fields, including the field-rate sync between them.
2FLD Sweep Magnification REF: Approximately X20.
Sweep Magnifier Registration REF: Magnification occurs about the center of the screen.
Timing Accuracy REF: All timing and linearity specifications exclude the first and last major
divisions of the unmagnified display.
REQ: 10 ms/division (2LINE): Within 2%.
REQ: 5 ms/division (1LINE): Within 2%.
REQ: 1 ms/division (2LINE + MAG): Within 2%.
REQ: 0.5 ms/division (1LINE + MAG): Within 3%.
Integral Linearity REQ: Within 1%.
REF: Measured between the 10 ms and 110 ms points on the 10 ms/division
(2LINE) sweep.
Horizontal Position REF: Any portion of a synchronized video sweep can be positioned on
screen in all sweep modes.
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
Bandwidth
REQ: Upper –3 dB Point: F
SC
+500 kHz, "100 kHz.
Lower –3 dB Point: F
SC
– 500 kHz, "100 kHz.
Chrominance Processing +V Mode
(Applicable to PAL operation only)
REF: +V-type display as selected by front-panel button. When pushed, the
V axis is inverted at a 1/2 line rate to produce a single vector display.
Display Vector Phase Accuracy REF: "1.25°.
REF: Measured with color bar signal.
Display Vector Gain Stability REF: Typically "2.5%.
Display Quadrature Phasing REF: Typically "0.5°.