Manual Fluke 190-102-III (page 56 of 98) (English)

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190 Series III

Users Manual

Missing Pulses

The next example is about how to find missing pulses in a train of positive pulses. In this

example, it is assumed that the pulses have a 100 ms distance between the rising edges. If the

time accidentally increases to 200 ms, a pulse is missing.

To set the test tool to trigger on such missing pulses, let it trigger on gaps bigger than 110 ms:

1. Press T to show the TRIGGER key labels.

2. Press 4 to open the TRIGGER OPTIONS menu.

3. Use the cursor and E to select Pulse Width on A and open the TRIGGER ON PULSE

WIDTH menu.

4. Use the cursor and E to select the positive pulse icon to trigger on a positive pulse, then

jump to Condition.

5. Use the cursor and E to select >t and jump to Update.

6. Use the cursor and E to select On Trigger and exit the menu.

The test tool is now prepared to trigger on pulses that are more than a selectable time in

duration. Observe that the trigger menu at the bottom of the screen has been adapted to set the

pulse condition. See Figure 30.

To set the pulse width to 400 μs:

7. Press 1 to enable the cursor and adjust the pulse width.

8. Use h i to select 400 μs.

Figure 30. Trigger on Missing Pulses

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Fluke 190-102-III Manual

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