CompuScope 1610C 147Windowed triggeringUsing the CompuScope 1610Cís ability to have two independent trigger sources which are ORed together, theuser can set up the triggering such that a trigger will occur if the input signal is outside a specified ìwindow,î i.e.it is higher than the upper limit or lower than the lower limit.Figure 86: Windowed triggeringChannel 1 or 2 triggeringThere are occasions when it is not possible to predict if the trigger is going to occur on Channel 1 or 2. Forexample, if the CompuScope 1610C is hooked up to two photon detectors that are picking up random orintermittent pulses, the user is not able to select the trigger source.The CompuScope 1610C can be put in a mode in which it will trigger on, say, the rising edge of a pulse onChannel 1 or on the rising edge of a pulse on Channel 2.In other words, by selecting two different sources with independent levels and slopes, the user can generate atrigger on the first occurrence of the pulse on either of the two channels.Trigger bus for Master/Slave systemsIn a Master/Slave system, any one of the input channels can be used as a trigger source.This is achieved by having a trigger bus in the Master/Slave Timing Module that causes any one of theCompuScope 1610C cards in the system to cause the entire system to trigger.This powerful feature allows the use of a multi-channel, Master/Slave CompuScope 1610C system for acquiringsignals in a system in which the user cannot predict which channel would receive the trigger signal. Examples ofthese applications are explosion testing and acoustic emission testing.External Trigger amplifierThe External Trigger input also has oscilloscope-like 1 MΩ / 30 pF input impedance.Gageís proprietary input-protection circuitry allows the FET stage to withstand voltages as high as ±15 Voltswithout causing any damage to the inputs.The trigger comparators have an operating range of ±1 Volt. Software-selectable attenuation of X1 or X5 on theExternal Trigger input allows input ranges of ±1 Volt and ±5 Volt, respectively.
