Model 7002Switch System Instruction Manual - Advanced Test ...

Front Panel Operation7002 2001Press STEPContinuousIdleInitiationBypassBWait forTrigger LinkTriggerAWait forTrigger LinkTriggerCScanChannelMakeMeasurementEDPull TriggerLine LowReleaseTrigger LineFNoScanned10Channels?Made10Measurements?NoYesYesFigure 4-32Operation model for semi-synchronous Trigger Link exampleATypically, the Model 2001 is used in the continuousinitiation state which means it will be in the not idle state.Since both the arm layer and scan layer are programmed forImmediate Source, operation drops down to the measure layerat point A where it waits for a Trigger Link trigger.B Pressing STEP takes the Model 7002 out of the idlestate. Since both the arm and scan layers are programmed forImmediate Spacing operation drops down to the channel layerat point B.C Since Channel Trigger Control is set for Source, thescan will not wait at point B for a trigger. Instead it will by-pass “Wait for Trigger Link Trigger” and close the first channel(point C). Note that the Bypass is only in effect on thefirst pass through the model.D After the relay settles, the Model 7002 will pull downthe Trigger Link trigger line (point D). Since the instrumentis programmed to scan 10 channels, operation will loop backup to point B where it will wait for an input trigger. Note thatBypass is no longer in effect.E & F Remember that 2001 operation is at point Awaiting for a trigger. When the trigger line was pulled low bythe Model 7002, the leading negative-going edge triggers the4-70