Tektronix VM700T - Manual (Page 8)

VERTICAL BLANKING
Measurement Range Absolute Mode Accuracy
Equalizing Pulse Width 80 ns to 1 µs ± 10 ns
Broad Pulse Width 80 ns to 1 µs ± 10 ns
Vertical Blanking Field 1 19 to 30 lines NA
Vertical Blanking Field 2 19 to 30 lines NA
Noise Spectrum measurement.
Vertical Blanking display.
MEASURE MODE (continued)
NOISE SPECTRUM
Measurement Range Absolute Mode Accuracy
Unweighted Signal-to-Noise –20 to –80 dB ± 0.4 dB
(5 MHz Low Pass) (–20 to –60 dB)
± 1.0 dB
(–60 to –70 dB)
Luminance Weighted Signal-to-Noise –20 to –80 dB ± 1.0 dB
(5 MHz Low Pass and (–20 to –60 dB)
Unified Weighting) ± 2.0 dB
(–60 to –70 dB)
Chrominance Weighted –20 to –80 dB ± 1.0 dB
Signal-to-Noise (–20 to –60 dB)
± 2.0 dB
(–60 to –70 dB)
SCH PHASE
Measurement Range Absolute Mode Accuracy
SCH Phase ± 90 deg ± 5 deg
Sync Timing ± 1 µS ± 10 nS
Burst Timing ± 180 deg ± 5 deg
Vertical Blanking Serration Pulse measurement.
Blanking
Display Blanking
Display Equalizer
Pulse Equalizer
Pulse Broad
Pulse Sep Broad
Pulse Sep V Sync
Display V Sync
Display Average
Num 32 Average
Num 32 Rescale Rescale
Timing Display Timing Display
Vertical Blanking (Sync = B) Vertical Blanking (Sync = B)
4.70 u sec
258 n sec
243 n sec
Average Off Average Off
SCH Phase measurement.
Source
Only Source
Only
Source and
Chan. A Source and
Chan. A
Source and
Chan. B Source and
Chan. B
Source and
Chan. C Source and
Chan. C
180
170
160
150
140
130
120
110
100 90 80
70
60
50
40
30
20
10
0
-10
-20
-30
-40
-50
-60
-70
-80 -90 -100
-110
-120
-130
-140
-150
-160
-170
SCH Phase Measurement SCH Phase Measurement 625 line PAL 625 line PAL Ch A SCH -3.2 deg
Ch B SCH -1.7 deg
Rel Burst -29.9 deg
Rel Sync 19 nsec
Color Frame Derived
from Channel B SCH
Sync Relative Timing (nsec)
1000 -1000 100 -100 10 -10 0
Burst Relative Phase (deg)
180 -180 30 -30 10 -10 3 -3 0
Average 32 -> 32
Amplitude (0 dB = 700 mV p-p) Amplitude (0 dB = 700 mV p-p)
(MHz) (MHz)
-84.0
-82.0
-80.0
-78.0
-76.0
-74.0
-72.0
-70.0
-68.0
-66.0
-64.0
-62.0
-60.0
1.0 2.0 3.0 4.0 5.0 6.0
-84.0
-82.0
-80.0
-78.0
-76.0
-74.0
-72.0
-70.0
-68.0
-66.0
-64.0
-62.0
-60.0
1.0 2.0 3.0 4.0 5.0 6.0
Noise Spectrum (Sync = B) Wfm --> Noise Spectrum (Sync = B) Wfm --> Pedestal
32 -> 32
Cursor1 3.71 MHz(+-34 kHz Band) -78.4 dB p-p
Cursor2 5.58 MHz(1.87 MHz above) -79.7 dB p-p ( -1.3 dB Diff)
Noise Area in Cursors -72.0 dB rms
Noise Level = -66.2 dB rms
Band width 100kHz to Full Band width 100kHz to Full
Line = 12 (SIS mode) Line = 12 (SIS mode)
Average Average
8
Blanking
Display Blanking
Display Equalizer
Pulse Equalizer
Pulse Broad
Pulse Sep Broad
Pulse Sep V Sync
Display V Sync
Display
Full Display Full Display
F1 F1
F2 F2
F3 F3
F4 F4
Vertical Blanking (Sync = B) Vertical Blanking (Sync = B)
Line = 12 (SIS mode)
Line = 12 (SIS mode) Line = 12 (SIS mode)
Bruch Sequence OK
Line = 12 (SIS mode)