Abstract
Digital storage oscilloscopes (DSOs) can do most of the things that analog oscilloscopes can do, as well as a number of things that analog oscilloscopes cannot do. So, it is not surprising that many of the controls on the two types of instruments are very similar. This applies to the trigger department as well as other departments. Thus, DSOs usually offer a choice of INTERNAL TRIGGER from CHANNEL 1 or CHANNEL 2 (on a two channel instrument, or any of the channels on a four channel instrument), or EXTERNAL TRIGGER. Most instruments offer an EXT+10 input to increase the dynamic range of acceptable external trigger signals. Additionally, mains-powered instruments provide a built-in LINE TRIGGER (that is, from the 50 or 60Hz AC line). This chapter also discusses the usual AUTO and NORMAL modes: in the latter, the timebase only runs if a trigger is present, failing which, the last trace acquired continues to be displayed. AUTO causes the timebase to retrigger every 20ms or so if no further triggers are received.
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