LLAC4 Four-Channel, Low-Level AC Conversion Module Revision: 3/12 C o p y r i g h t © 2 0 0 4 - 2 0 1 2 C a m p b e l l S c i e n t i f i c , I n c .
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LLAC4 Table of Contents PDF viewers: These page numbers refer to the printed version of this document. Use the PDF reader bookmarks tab for links to specific sections. 1. General Description.....................................................1 2. Specifications ..............................................................2 3. Measurements..............................................................2 4. Wiring............................................................................3 5.
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LLAC4 Four-Channel, Low-Level AC Conversion Module 1. General Description The LLAC4 is a peripheral device used to increase the number of low-level AC signals a datalogger can monitor. The module enables four datalogger control ports to emulate pulse-counting channels by converting the low-level AC signals to the logic levels datalogger control ports require. The LLAC4 is often used to measure up to four anemometers, and is especially useful for wind profiling applications.
LLAC4 Four-Channel, Low-Level AC Conversion Module 2. Specifications Power: 8 to 16 Vdc 0.1 mA @ 12 Vdc Signal Conditioning: Minimum AC Input Voltage versus Output Square Wave Frequency: Input Sine Wave (mV RMS) 20 200 2000 5000 Output Square Wave Range (Hz) 1.0 to 20 0.5 to 200 0.3 to 10,000 0.3 to 20,000 AC Coupling Removes DC Offset: up to ±0.5V Input Hysteresis: 16 mV @ 1 Hz Max AC Input Voltage: ±20 V Dimensions: 8.0 W x 5.4 H x 2.5 D cm (3.1 in x 2.1 in x 1.0 in) 11.2 W x 5.4 H x 2.
LLAC4 Four-Channel, Low-Level AC Conversion Module TABLE 2.
LLAC4 Four-Channel, Low-Level AC Conversion Module 5. Program Examples Using the CR1000, let's measure four different wind speed sensors that produce low-level AC signals. These will include the RM Young 05103, 05106, 05305, propeller type anemometers, and RM Young 03101 cup anemometer. Program examples are provided for both the CR1000 and the CR200(X).
LLAC4 Four-Channel, Low-Level AC Conversion Module 'Main Program BeginProg Scan (1,Sec,0,0) PulseCount (RMY05103WS,1,15,0,1,0.098,0.0) PulseCount (RMY05106WS,1,16,0,1,0.098,0.0) PulseCount (RMY05305WS,1,17,0,1,0.1024,0.0) PulseCount (RMY03101WS,1,18,0,1,0.750,0.20) If RMY03101WS < 0.21 Then RMY03101WS = 0.
LLAC4 Four-Channel, Low-Level AC Conversion Module 'Main Program BeginProg Scan (1,Sec) PulseCount (RMY05103WS,P_LL,0,1,0.098,0.0) PulseCount (RMY05106WS,C1,0,1,0.098,0.0) PulseCount (RMY05305WS,C2,0,1,0.1024,0.0) PulseCount (RMY03101WS,P_SW,0,1,0.750,0.20) If RMY03101WS < 0.21 Then RMY03101WS = 0.
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