Filter
Top Products
Specifications
1–12
1780R-Series Service Manual
Table 1–6: Synchronization
Characteristic Performance Requirement Supplemental Information
Performance
Check Step
Sync Input
Internal
Ref. Sync Separator 0.2 to 2.0 V peak-to-peak com-
posite video.
Composite video applied to Inputs
A, B1, B2, or B3 or probe.
42
Int. Sync Separator 0.5 to 2.0 V peak-to-peak com-
posite video.
42
External
Black Burst –14 dB to +6 dB. Black Burst signal of 0.2 to 5
times amplitude applied to EXT
SYNC input.
43
Composite Sync 0.2 to 8.0 V peak-to-peak. Composite sync applied to EXT
SYNC input locks waveform
monitor; vectorscope also re-
quires CW signal.
43
SCH Modes 286 mV (300 mV PAL) Sync and
Burst ±3 dB.
Composite Video or Black Burst. 56
Direct Sync
Horiz. Freq. Range 15.75 kHz ±1 kHz. Frequencies much below
15.75 kHz will not permit a normal
TV display.
Sync Jitter
Comp sync or video ≤12 ns with respect to input sync. 44
Variable APL (10–90%) ≤20 ns; with the addition of 36 dB
white noise ≤90 ns.
Noise Immunity <250 ns jitter, 1 V composite
video with _–26 dB white noise.
AFC Sync
Horiz. Freq. Range 15.75 kHz ±200 Hz.
44
Lock-In Time <1 second.
Sync Jitter
Comp sync or video
Variable APL (10–90%)
≤10 ns; with the addition of 36 dB
white noise ≤12 ns.
Jitter with respect to white noise ≤30 ns. Doubles with each 6 dB increase
in white noise.
Noise Immunity <90 ns jitter, 1 V composite video
with _–26 dB white noise.