Operating Basics
2–8
ECO 422
Table 2–2: Truth Table for ECO 422 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 ECO 422
The example sets switch 7 for NTSC active video with the threshold set for a
3 dB down color bar. It uses a TSG 170D as the signal source, a 1780R
waveform monitor/vectorscope (optional) to view the signal level, and a step
attenuator.
How to Adjust the
User-Defined Threshold
Levels
Summary of Contents for ECO 422
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Page 14: ...General Safety Summary viii ECO 422 ...
Page 16: ...Service Safety Summary x ECO 422 ...
Page 17: ...Getting Started ...
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Page 41: ...Operating Basics ECO 422 2 9 Figure 2 6 Setup for Adjusting R265 the User Level for SX 7 ...
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