Medical ScopeMeter
Waveform Triggers
41
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.
Содержание 190M III Series
Страница 8: ...iv 190M Series III Users Manual...
Страница 84: ...190M Series III Users Manual 76...
