Fluke 8808A User Manual - Page 50

8808A Users Manual 2W/4W HI INPUT V SENSE 4W HI 1000V 750V MAX LO 200 mA MAX 1000 V 600 V CAT I CAT II 300 V 1V LO 500 Vpk 10 A MAX mA 10 A Figure 3-11. Diode Test eue16.eps Making a Triggered Measurement The Meter features a trigger function that allows you to select a measurement trigger source. When the trigger mode is set to 3 or 5, the delay between receiving the trigger and the start of a measurement is 400 ms. Refer to Chapter 1 for trigger delay response specifications. Upon completion of each measurement, a "measurement-complete" signal (low-true pulse) is sent to the external trigger terminal on the rear panel. See the "Electrical Specifications" section in Chapter 1 for information on this signal. The following sections discuss triggering the Meter automatically using its internal trigger, or externally using the trigger key on the front panel and the trigger terminal on the rear panel. Setting the Trigger Mode There are five possible sources for triggering a measurement: • Mode 1 is automatic. Measurements are triggered internally and are continuous and occur as fast as the configuration will allow. • Mode 2 is triggered without delay using J. • Mode 3 is triggered with delay using J. • Mode 4 is triggered without delay by an external signal. • Mode 5 is triggered with delay by an external signal. To select a trigger source: 1. Press Q then J. 2. Press U or V to choose the trigger mode. 3. Press R and hold for 2 seconds to save the selected mode. Connecting to an External Trigger The Meter provides two external trigger connection methods for different operation modes. Table 3-4 shows the layout of the TRIG/IO_RS232 connector. 3-16