Tektronix WFM90D, Quick Start Manual

Page: 24 / 170

Specifications
1- 6
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 Bandwidth
REQ:
Upper --3 dB Point:
F
SC
+500 kHz, 100 kHz.
Lower --3 dB Point:
F
SC
-- 500 kHz, 100 kHz.
Chrominance ProcV 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:
1.25
°
. Analog input only.
REF:
Measured with color bar signal.
Display Vector Gain Stability
REF:
Typically 2.5%. Analog input only.
Display Quadrature Phasing
REF:
Typically 0.5
°
. Analog input only.
Display Differential Phase
REF:
1
°
. 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:
1%. 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: 50 Hz of F
SC
.
PAL: 10 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: Within 1 second, with subcarrier frequency within 50 Hz (10 Hz for
PAL) of F
SC
.
Subcarrier Regenerator Phase Shift
with Subcarrier Frequency Change
REQ:
NTSC: 2
°
from F
SC
to (F
SC
+ 50 Hz), or F
SC
to (F
SC
-- 50 Hz).
PAL: 2
°
from F
SC
to (F
SC
+ 10 Hz), or F
SC
to (F
SC
-- 10 Hz).
Subcarrier Regenerator Phase Shift
with Burst Amplitude Change
REQ:
2
°
from nominal burst amplitude to 6 dB.
REF:
Internal or External burst reference.
Subcarrier Regenerator Phase Shift
with Variable Gain Control
REQ:
1
°
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.