Table of Contents
Advertisement
Triggering the Oscilloscope
8.5
Trigger Holdoff
Trigger holdoff can be help stablize triggering on complex repetitive waveforms that
have multiple edges or other events between waveform repetitions (such as pulse
series). Holdoff time is specified as the amount of time that the oscilloscope waits for
re-arming the trigger circuitry after generating a correct trigger. The oscilloscope will
not trigger even if the trigger condition is met during the holdoff time and will only
re-arm the trigger circuitry after the holdoff time expires.
For example, to get a stable trigger on the repetitive pulse burst as shown in the
figure below, set the holdoff time to be greater than t1 but less than t2.
Click or tap the trigger information label (as shown in the figure below) at the top of
the screen or press the front-panel
tap the input field of Holdoff to set the holdoff time (the holdoff to this time when
the waveforms are stably triggered) with the pop-up numeric keypad. You can also
use the corresponding multipurpose knob to set the value. The adjustable range of
the holdoff time is from 8 ns (default) to 10 s.
8.6
Noise Rejection
Noise rejection can reject the high frequency noise in the signal and reduce the
possibility of triggering the oscilloscope by mistake.
HDO4000 User Guide
72
Figure 8.2 Trigger Holdoff
key to open the "Trigger" menu. Click or
Copyright ©RIGOL TECHNOLOGIES CO., LTD. All rights reserved.
Advertisement
Table of Contents
