Operating Basics
ECO422D SD/HD Changeover Unit Instruction Manual
2- 9
Table 2- 3: Truth table for ECO422D switching
Power
User config
Switch
P
B
O auto
O manual
1
N
#
0
0
#
#
1
N
#
0
1
B
#
1
N
#
1
0
P
#
1
N
#
1
1
#
#
1
N
"
0
0
"
"
1
N
"
0
1
B
B
1
N
"
1
0
P
P
1
N
"
1
1
"
"
1
O
#
0
0
#
#
1
O
#
0
1
B
#
1
O
#
1
0
P
#
1
O
#
1
1
#
#
1
O
"
0
0
"
"
1
O
"
0
1
B
"
1
O
"
1
0
P
"
1
O
"
1
1
"
"
0
X
X
X
X
P
P
The User-defined Threshold Levels are the two levels available from User
Configuration switches 6 and 7. They are available so that the user can trigger on
signal levels other than the seven predefined levels.
In order to set the Threshold Levels, you need:
H
Two good versions of the type of signal you want to check
H
A step attenuator (example: 847 Attenuator from KAY Elemetrics)
H
A waveform monitor or oscilloscope (optional)
H
The ECO422D
The example sets switch 7 for NTSC active video with the threshold set for a
3 dB down color bar. It uses a TSG 130A as the signal source, a 1745A
waveform monitor (optional) to view the signal level, and a step attenuator.
1.
Connect the equipment as shown in Figure 2--6.
How to Adjust the
User-Defined Threshold
Levels
Содержание ECO422D
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Страница 10: ...Table of Contents vi ECO422D SD HD Changeover Unit Instruction Manual...
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Страница 18: ...Preface xiv ECO422D SD HD Changeover Unit Instruction Manual...
Страница 19: ...Getting Started...
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