Waveform Monitor
Waveform Monitor – A piece of test equipment which displays waveforms (analog video signals) at a horizontal and/or vertical rate. A specialized oscilloscope for evaluating television signals. a) DC Restore – A circuit used in picture monitors and waveform monitors to clamp on point of the waveform to a fixed DC level. Typically the tip of the sync pulse or the back porch. This ensures the display does not move vertically with changes in the signal amplitude or average picture level (APL). The DC Restore speed can be set to SLOW or FAST DC. SLOW allows hums and other low frequency distortions to be seen. FAST DC removes the effects of hum from the display so it will not interfere with other measurements. b) AFC/Direct – This selection allows the waveform monitor’s horizontal sweep to trigger on each individual horizontal sync pulse (direct mode). This will allow the user to see any jitter that might be in the signal. Or the waveform monitor can trigger horizontally in the AFC mode which causes the horizontal sweep to trigger on the average value of the horizontal sync pulses. The AFC mode eliminates jitter.
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