Digital Acoustics ESBx-110 Especificaciones descargar pdf (Pagina 269)

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101

Signal Analyzer

ADDvantage-32 PLUS ● AC to DC Power Converter

5-7

5.7 ANALYZER EXAMPLE: CAPTURE OF AN OVERSPEED EVENT

The signal analyzer can trigger on an overspeed event and capture a recording of the

speed.

The following shows an example of how one channel of the signal analyzer may be

configured to capture a signal when an unusual or unexpected event occurs. In this

example the analyzer will capture the speed feedback when the speed exceeds a

predetermined speed.

The signal analyzer channel is configured as follows:

Input Data: ABS ACT SPD

Trigger: Rising at 1,050 of ABS ACT SPD

Sample Rate: 1 = 2.777 msec

Total Time: 8,000 events × 2.777 ms = 22.22 seconds

Preview: 4,000 events

Reset: Zero bit

Enabled: One bit

The analyzer will capture the speed feedback signal by recording the ABS ACT SPD

value. The trigger is also set to monitor the speed feedback signal. A trigger event will

be detected when the speed feedback signal as reported by the ABS ACT SPD value

passes through the value of 1,050 in a rising manner (the prior sample of ABS ACT SPD

was less than 1,050 and the current sample is greater than 1,050). After the trigger is

detected, the analyzer will collect an additional 4,000 samples of the ABS ACT SPD

signal, recording a sample every 0.00277 seconds.

Figure 5-1 shows the trigger and the actual data stored for an event in which the speed

feedback exceeds the 1,050 trigger level. Note that for this example the analyzer channel

had been enabled long enough prior to the trigger to allow the full 4,000 samples of pre-

trigger data to have been collected:

1 2 ... 264 265 266 267 268 269 270 271 272 273 274 ... 465 466

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Digital Acoustics ESBx-110 Especificaciones Pagina 269

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