Fluke PM3370B user manual Direct Trigger Setup, Direct trigger setup

GETTING STARTED 3 - 13

3.9 DIRECT TRIGGER SETUP

Now you are ready to set your trigger conditions. You will use one of the channel selection keys (TRIG1, TRIG2, TRIG3, TRIG4 or EXT TRIG) and the TRIGGER LEVEL control.

Figure 3.7 Direct trigger setup

Step 1 Press the AUTOSET key. The square-wave signal of the Probe Adjust output is now displayed on channel 1. Turn channel 2 on to display a second horizontal trace (channel 2 has no input signal).

Step 2 Press the TRIG2 key so that channel 2 is selected as the trigger source. The result is that the signal on channel 1 is no longer triggered (not stable). The ARM’D LED is on, to indicate that the oscilloscope is not triggered. Check also that the right side of the bottom text line indicates the trigger source (’ch2’).

Step 3 Only in 2 channel models

Press EXT TRIG key to select External Trigger input as the trigger source. Check that the rightside of the bottom textline indicates the trigger source ’EXT’.

Step 4 Press the TRIG1 key. Channel 1 is now selected as the trigger source. The ’ch1’ symbol is displayed in the bottom text line. Triggering resumes. Turn channel 2 off, by pressing ON again.

Step 5 Press the ns key of the MainTB TIME/DIV keys until the timebase is set to ’2 μs/div’.