Manual Fluke 190-102-III (page 52 of 98) (English)

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190 Series III

Users Manual

Edge Triggers

If the signal is unstable or has a very low frequency, use edge triggering to obtain full manual

trigger control.

To trigger on rising edges of the input A waveform:

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 open the TRIGGER ON EDGE menu.

When Free Run is selected, the test tool updates the screen even if there are no triggers. A

waveform always appears on the screen.

When On Trigger is selected, the test tool needs a trigger to display a waveform. Use this

mode if you want to update the screen only when valid triggers occur.

When Single Shot is selected, the test tool waits for a trigger. After receiving a trigger, the

waveform is displayed and the instrument is set to HOLD.

In most cases, use the Free Run mode.

4. Use the cursor and E to select Free Run, jump to Trigger Filter.

5. Use the cursor and E to set Trigger Filter to Off.

Observe that the key labels at the bottom of the screen have adapted to allow further

selection of specific edge trigger settings.

Noisy Waveform Triggers

To reduce jitter on the screen when triggering on noisy waveforms, you can use a trigger filter.

Continue from step 3 of the previous example:

1. Use the cursor and E to select On Trigger and jump to Trigger Filter.

2. Use the cursor and E to set Noise Reject or HF Reject to On. This is indicated by a

taller trigger icon.

When Noise Reject is on, an increased trigger gap is applied. When HF Reject is on, HF

noise on the (internal) trigger signal is suppressed.

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Fluke 190-102-III Manual

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