Instruction manual

68
Trigger Function
The NA-27 incorporates three kinds of trigger functions: level trigger, external trigger,
and time trigger. The trigger can also be disabled completely.
Trigger mode selection
1. Press the SETUP key to call up the SETUP menu screen.
(For an explanation of how to use the SETUP menu screen, refer to page 30.)
2. Set the "TRIGGER MODE" item as desired. There are four possible settings, as
listed below.
OFF: Trigger function is disabled.
LEVEL: Measurement starts when preset level conditions are met (see page
70).
EXTRN: An external CMOS logic-level signal (0 to 5 V) supplied to the trigger
input on the side of the NA-27 serves to trigger the measurement,
using the falling edge of the signal. The external trigger is also activated
when the terminals of the trigger input are shorted (see page 71).
TIME: Measurement starts at a preset time and is repeated at preset intervals
(see page 73).