Tektronix WFM90D, Быстрый старт

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Specifications
1- 4
WFM90D and WFM91D Service Manual
Table 1- 1: Vertical deflection system (Cont.)
Category Description
Transient Response
Digital Input
REF:
Specifications apply for full screen height video input signal, with VAR GAIN off, 1 V Full Scale
or X5 Gain selected, and FLAT filter selected.
REF:
Pulse-to-Bar Ratio:
X1: 0.99:1 to 1.01:1
X5: 0.98:1 to 1.02:1
REF:
Preshoot:
≤
1%
REF:
Overshoot: X1:
≤
2%
X5:
≤
4%
REF:
Ringing: X1:
≤
2%
X5:
≤
4%
REF:
Field Rate Tilt:
≤
1%
REF:
Line Rate Tilt:
≤
1%
Maximum Absolute Input
Level
REF:
±
5 VDC plus peak AC.
REF:
Displays in excess of 200 IRE (1.428 V) may cause frequency response aberrations.
DC Input Impedance
(Unterminated)
REQ:
≥
15 k
Ω
.
REF:
With input switch in the HIZ position.
Video Input Return Loss
REF:
≥
40 dB from 50 kHz to 6 MHz
≥
15 dB from 6 MHz to 270 MHz
REF:
With 75
Ω
termination on.
Video Out Return Loss
(75
Ω
)
REF:
≥
30 dB from 50 kHz to 6 MHz.
Video Out Differential
Gain (50% APL)
REF:
Within 1% with a 140 IRE (1.0 V PAL) unit display. Analog input only.
Video Out Differential
Phase (50% APL)
REF:
Within 1
°
with a 140 IRE (1.0 V PAL) unit display. Analog input only.
Table 1- 2: DC restoration
Category Description
DC Restorer Clamp Time
REF:
Back Porch.
Frequency Response
at 60 Hz (50 Hz PAL)
REQ:
Attenuation of 60 Hz (50 Hz PAL) on Input Signal:
Slow Mode:
≤
20%.
Fast Mode:
≥
90%.
REF:
Blanking Level Shift with 10% to 90% APL Change: APL changes from 50% to either 10% or
90% will cause blanking level shift of 1 IRE unit (7.14 mV PAL) or less.
REF:
Blanking Level Shift Due to Presence or Absence of Burst: 1 IRE unit (7.14 mV PAL) or less
shift from no color burst to presence of color burst.