pretrigger

pretrigger

[prē′trig·ər]
(electronics)
Trigger used to initiate sweep ahead of transmitted pulse.
References in periodicals archive ?
You can program in a "Pretrigger Delay," so that the shutter doesn't fire again as soon as the mount stops moving, but after a delay to allow for vibration to settle.
Different from electroencephalography (EEG) which reflects the brain's spontaneous electrical activity over a short period of time, SEPs are not recorded continuously to spontaneous stimuli but are time locked to a stimulus with a pretrigger. (15) SEP peak amplitudes are traditionally in the under 10 [micro]V range (smaller then EEG [tens of [micro]V], EMG [mV], ECG [V]).
In the monitoring, the data sampling rate was set at 2 MHz, with the pretrigger set as 250.000 [micro]s and data length at 2 k.
Baseline and noise information (RMS and peak-to-peak) is calculated in the pretrigger window (2 [micro]s wide).
Similar to the old analog trigger hold-off function, arming must disable triggering until the selected amount of pretrigger data has been captured.
Acquisitions are triggered when the signal received from one of the sensors reaches a threshold level of 140 mV; pretrigger recording is enabled to obtain the previous history of each signal.
ANOVA was conducted on the average pretrigger rmsEMG calculated for each participant in the period 100 ms prior to single-pulse and paired-pulse TMS for each tDCS condition (0.8,1.0, and 1.2 mA) and for the time points of baseline, immediately after, and 15 and 30 minutes following tDCS.
Addition of the pretrigger reagent, which includes hydrogen peroxide, and the trigger reagent, which includes sodium hydroxide, leads to acridinium-produced chemiluminescence, measured as relative light units (RLUs).
Upon review of this application, it was found that turning on the pretrigger (starting sonics before the horn makes contact with the part) solved the problem with the initially recommended [TABULAR DATA OMITTED] booster.
The fast sweep time along with gap sweep and pretrigger functions make simultaneous measurements of pulse rise and fall times easy, as shown in Figure 2.