Performance Characteristics
Table 6-3 (cont)
Characteristics
Performance Requirements
TV (Back-Porch) Clamp (CH 2 only)
60 Hz Attenuation
For VOLTS/DIV settings between 5 mV and
0.2 V with VAR control in calibrated detent.
Six-division reference signal.
>18dB.
Back-Porch Reference
Within 1.0 division of ground reference.
TRIGGERING
Sync Separation
Line Selection Range in FLD1,
FLD2,
or Both Coupling Modes
Input Signal Amplitude for Stable
Triggering
Channel
1
or Channel 2
Composite Video
Composite Sync
Channel 3 or Channel 4
Composite Video
Composite Sync
Stable video rejection and sync separation from
sync-positive or sync-negative composite video,
525 to 1280 lines, 50 Hz or 60 Hz, interlaced or
noninterlaced systems.
For noninterlaced scan systems, the video
signal source must start and end with full lines
of video for correct line identification in the field
trigger modes.
The lesser of 1280 or the number of lines in the
field.
Minimum sync-pulse amplitude within 18
divisions of input ground reference.
1 division.
0.3 division.
Minimum sync-pulse amplitude within 9
divisions of input ground reference.
0.5 division.
0.25 division.
2465B/2455B/2445B Operators
6-27
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