Section 8. Operation
340
differential inputs or reversing the excitation is specified, there are two separate
integrations per measurement; if both reversals are specified, there are four
separate integrations.
Analog Measurement Integration
Integration Time (ms)
Integration
Parameter Argument
Comments
0 to 16000 µs
0 to 16000
250 µs is considered fast
and normally the
minimum
16.667 ms
_60Hz
Filters 60 Hz noise
20 ms
_50Hz
Filters 50 Hz noise
Ac Power Noise Rejection
Grid or mains power (50 or 60 Hz, 230 or 120 Vac) can induce electrical noise at
integer multiples of 50 or 60 Hz. Small analog voltage signals, such as
thermocouples and pyranometers, are particularly susceptible. CR3000 voltage
measurements can be programmed to reject (filter) 50 Hz or 60 Hz related noise.
Noise is rejected by using a signal integration time that is relative to the length of
the ac noise cycle, as illustrated in the figure Ac Power Noise Rejection
Techniques
(p. 340).
FIGURE 79: Ac Power Noise Rejection Techniques
Содержание CR3000 Micrologger
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Страница 200: ...Section 7 Installation 200 FIGURE 42 Running Average Frequency Response FIGURE 43 Running Average Signal Attenuation ...
Страница 485: ...Section 8 Operation 485 8 11 2 Data Display FIGURE 110 Keyboard and Display Displaying Data ...
Страница 487: ...Section 8 Operation 487 FIGURE 112 CR1000KD Real Time Custom ...
Страница 488: ...Section 8 Operation 488 8 11 2 3 Final Storage Data FIGURE 113 Keyboard and Display Final Storage Data ...
Страница 489: ...Section 8 Operation 489 8 11 3 Run Stop Program FIGURE 114 Keyboard and Display Run Stop Program ...
Страница 491: ...Section 8 Operation 491 FIGURE 116 Keyboard and Display File Edit ...
Страница 495: ...Section 8 Operation 495 Low power standby whenever possible Low power bus sets bus and modules to low power ...
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Страница 564: ...Section 11 Glossary 564 FIGURE 126 Relationships of Accuracy Precision and Resolution ...
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