Maintenance
Page 6-14
Service Manual
MT930B
FM Static Threshold C/N Measurement
Measurement Conditions:
•
Video Modulation Ratio: 50% pedestal, 24.0 MHz p-p
•
Pre-emphasis: 625
•
System: 625
•
VM-700 connections: EXT SYNC terminal connected to test signal
•
VM-700
settings:
•
WAVEFORM
→
MENU
→
SYNC
→
External Sync
Measurement Procedure:
1.
Vary the noise attenuator in 1 dB steps, and draw a graph of C/N vs. S/N as
in Figure 6-6.
2.
The C/N value that is 1 dB below the S/N line is the result.
VIDEO
S/N
50
40
30
5
10
15
1 dB
C/N (dB)
FM STATIC THRESHOLD C/N
9274
Figure 6-5. Measuring FM Static Threshold
Measurement Specification:
FM Static Threshold C/N:
≤
8.5 dB
Summary of Contents for mt930b
Page 3: ...MT930B Service Manual Page i ...
Page 10: ...General Information Page 1 4 Service Manual MT930B THIS PAGE INTENTIONALLY LEFT BLANK ...
Page 22: ...Controls and Connections Page 3 4 Service Manual MT930B THIS PAGE INTENTIONALLY LEFT BLANK ...
Page 86: ...Options Maintenance Page 7 2 Service Manual MT930B THIS PAGE INTENTIONALLY LEFT BLANK ...
Page 90: ...Drawings Page 9 2 Service Manual MT930B 10264 Figure 9 1 MT930B Block Diagram 1 ...
Page 91: ...Drawings MT930B Service Manual Page 9 3 10265 Figure 9 2 MT930B Block Diagram 2 ...
Page 92: ...Drawings Page 9 4 Service Manual MT930B 10266 Figure 9 3 MT930B Block Diagram 3 ...
Page 93: ...Drawings MT930B Service Manual Page 9 5 10267 Figure 9 4 MT930B Block Diagram 4 ...
Page 94: ...Drawings Page 9 6 Service Manual MT930B 10268 Figure 9 5 MT930B Head Phone Schematic ...
Page 95: ...Drawings MT930B Service Manual Page 9 7 10269 Figure 9 6 MT930B RF PC Board Schematic ...
Page 96: ...Drawings Page 9 8 Service Manual MT930B 10270 Figure 9 7 MT930B Converter Module Schematic ...
Page 97: ...Drawings MT930B Service Manual Page 9 9 10271 Figure 9 8 MT930B Main PC Board Sheet 1 of 3 ...
Page 98: ...Drawings Page 9 10 Service Manual MT930B Figure 9 9 MT930B Main PC Board Sheet 2 of 3 ...
Page 99: ...Drawings MT930B Service Manual Page 9 11 10273 Figure 9 10 MT930B Main PC Board Sheet 3 of 3 ...
Page 100: ...Drawings Page 9 12 Service Manual MT930B 10274 Figure 9 11 MT930B Power Supply Schematic ...
Page 101: ...Drawings MT930B Service Manual Page 9 13 10275 Figure 9 12 MT930B IF Filter Block Schematic ...
Page 102: ...Drawings Page9 14 Service Manual MT930B 10276 Figure 9 13 MT930B Audio IF PB01 Schematic ...
Page 103: ...Drawings MT930B Service Manual Page 9 15 10277 Figure 9 14 MT930B Audio Out Schematic ...