DSO54-No2 Light Gate.qxp - Serrata Science Equipment
DSO54-No2 Light Gate.qxp - Serrata Science Equipment
DSO54-No2 Light Gate.qxp - Serrata Science Equipment
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Product code 3250<strong>Light</strong> <strong>Gate</strong>SmartTECHNOLOGYQ<strong>Light</strong> <strong>Gate</strong>Measurement procedureScrew the support rod into the appropriate mounting thread and clamp to a stand.Product code 3250<strong>Light</strong> <strong>Gate</strong>Position 1Position 2Position 3Position the <strong>Light</strong> <strong>Gate</strong> so the object will block the infrared beam when it passesthrough the <strong>Light</strong> <strong>Gate</strong>.Timing investigationsProbably the most common use of <strong>Light</strong> <strong>Gate</strong>s is in timing experiments.Measurements can be taken from either a single <strong>Light</strong> <strong>Gate</strong> connected to Input Aor from two <strong>Light</strong> <strong>Gate</strong>s connected to both Input A and B.Timing is started when the infrared beam at Input A is blocked T 0 (which changesthe logic level from 0 to 1). When the infrared beam is unblocked its logic statechanges back to 0 and the time interval is stored as T 1 . If another <strong>Light</strong> <strong>Gate</strong> isconnected to Input B then the time its infrared beam is blocked is stored as (T 2 )and when it’s unblocked T 3.INPUTABlocked: logic 1INPUTBSTARTUnblocked: logic 0T 0T 1T 2T 33
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