Gentec-eo MACH 6 Manuel d'utilisateur télécharger pdf (Page 32)

Mach 6 User’s Manual Revision 2.1 32

the mode of X is 4 because that is the value that most often occurs in X.

Pulses Below Threshold

When the Search Data for Missing Pulses button is pressed, the current data set is

examined. Any pulses with energy less than the threshold are flagged as missing, and

their time stamps are recorded and displayed. This can be used with internal and external

triggering, but it is most effective when used with external triggering.

Pulses Below Trigger

With internal triggering, if the pulse is below the trigger level, no trigger will occur, but

the period timer will still be running. This means that the period will be longer between

the pulses adjacent to the missing pulses. The applications software examines the pulse

data for this condition and records the time stamps where the period is discontinuous.

From the continuous period data, the true period can be found and used to count how

many pulses were missing in the discontinuities.

Average Frequency

The measured average frequency of the data set.

Pulse Jitter

The difference between the maximum and minimum pulse periods in the data set.

The FFT Display

Figure 7 shows the FFT Display of the Applications Software. This is useful for finding

periodic disturbances in the data. The plot shown was taken with an 11 kHz AM

modulation applied to the 50 kHz pulse signal. The 11 kHz modulation is clearly seen.

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Gentec-eo MACH 6 Manuel d'utilisateur Page 32