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Troubleshooting AV sync measurement
1. Is your battery good? Battery voltage must remain above 5.5 volts at all times for
guaranteed performance. If you see a change in the LCD screen’s contrast, the battery is
well past exhaustion. See the specifications page for approximate battery life estimates.
2. Unable to get the monitor icon to animate. There are two likely causes. Either the
video flashes hitting the detector are too low to be detected or there is so much light
hitting the detector at all times that it is unable to detect video flashes.
• If your display is very bright try using the Bright button. If your display is not bright,
try turning up the image display’s brightness or moving Syncheck3 closer to the
screen. If having trouble with a home theater projector, try holding Syncheck3
directly in the light path (pointed at the projector lens).
• Bright ambient light can overload the detectors, especially the most sensitive one.
Reduce ambient lighting, close curtains and doors or if outdoors wait until dusk. Try
pressing the Bright button.
• The light detectors are equally sensitive to invisible infrared light. Is there any
equipment producing infrared light such as intruder detection or hearing-impaired
broadcasters?
3. The monitor icon seems to be activated even when no video is present. A pulsing light
source is hitting the detector.
• All lights connected to AC mains exhibit some degree of pulsing, even though our
eyes do not notice it. Turn them off and/or make certain there is no light directly
hitting the detector (except of course from the screen you are measuring).
• All display monitors present pulsing light. If you are holding Syncheck3 very close to
a display screen, move away several feet and/or try the low-sensitivity detector
setting (see “Additional Button Functions: Bright”).
• The detectors are equally sensitive to visible and invisible infrared light. Is there any
equipment producing infrared light such as intruder detection or hearing-impaired
broadcasters?
4. Unable to get the sound icon to animate. Audio input levels are too low. If using the
mini-XLR input jack, check that the line input switch jumper is connected (see “How To
Connect Line Level Audio Signals”).
5. The sound icon seems to be activated at all times, even when no audio is playing.
There is noise on the audio input.
• There could be an audible buzz in the audio source.
• There may be excessive dither noise present (above human hearing) from digital to
analog converters when several converter outputs are combined together to a single
signal, such as with summing buss mixers. Syncheck3 contains a filter to reduce this
possibility.
6. Unable to get a steady time reading
• You may be noticing “span”. See “Understanding AV Synchronization and Span”.
• A steady reading will be impossible if you are using one of our multi-spaced test files
and audio/video synchronization error is more than 4 frames. Try one of the one per
second files first, before using a multi-spaced version.
• There may be optical interference from another light source, such as fluorescent
lighting or security devices that are causing false optical triggers. We have seen
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user manual Page 13 of 18