Advantech PCM-3291 Manual de usuario descargar pdf (Pagina 11)

PCM-3291

3.5 TMARK

The TMARK pulse waveform is shown in Figure 1. This signal is a positive

logic , buffered CMOS level output pulse that transitions from a logic “low”

condition to a logic “high” at a 1 Hz rate. The TMARK output pulse rise time

is typically less than 2 nanoseconds and the pulse duration is typically 25.6

milliseconds.

Figure 1. GPS Receiver Time Mark Pulse Waveform.

3.6 10KHz clock

This is a 10KHz clock waveform that is synchronized to the UTC TMARK

pulse. The relationship between the 10KHz clock and the TMARK UTC pulse

is shown in Figure 2. This clock signal is a positive logic , buffered CMOS level

output.

Figure 2. 10KHz Clock/UTC TMARK Pulse Relationship

2.00Vch1 M5.00ms ch1 3.56V

ch1 +Width

25.600ms

2.00Vch3 M40us ch2 1.28V

TMARK pulse

10KHz clock

ch2 2.00V

1 2 ... 6 7 8 9 10 11 12 13

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Advantech PCM-3291 Manual de usuario Pagina 11