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Campbell LLAC4 Instruction Manual

Four-channel, low-level ac conversion module
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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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Summary of Contents for Campbell LLAC4

  • Page 1 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 ,...
  • Page 3 Campbell pricelist or product manual. Products not manufactured, but that are re-sold by Campbell, are warranted only to the limits extended by the original manufacturer. Batteries, fine-wire thermocouples, desiccant, and other consumables have no warranty.
  • Page 4 SCIENTIFIC, INC., phone (435) 227-9000. After an applications engineer determines the nature of the problem, an RMA number will be issued. Please write this number clearly on the outside of the shipping container. Campbell Scientific's shipping address is: CAMPBELL SCIENTIFIC, INC.

  • Page 5: Table Of Contents

    PDF reader bookmarks tab for links to specific sections. 1. General Description.............1 2. Specifications ..............2 3. Measurements..............2 4. Wiring................3 5. Program Examples ............4 Figures 1. LLAC4 four-channel, low-level AC conversion module ......1 2. LLAC to TTL .....................3 Tables 1. Sensor Output Frequencies .................2 2. Control Port Compatibility .................3...
  • Page 6 This is a blank page.

  • Page 7: General Description

    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.
  • Page 8 The datalogger’s pulse channels can read this low-level AC signal directly. The LLAC4 has signal conditioning to convert the low-level AC to a 0 to 5 volt square wave that can be measured on the datalogger’s control ports. The frequency response of the LLAC4 is the same as the low-level AC on the pulse inputs.

  • Page 9: Wiring

    4. Wiring Most sensors that have a low-level AC output will have three wires: signal, reference, and drain. The signal wire should go to P1 – P4 on the LLAC4 and the reference and drain wires to a on the LLAC4. The LLAC4 also requires that 12 V be applied to its 12 V terminal and G.

  • Page 10: Program Examples

    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).
  • Page 11 'CR5000 Series Datalogger Public Pulse_LLAC(2) BeginProg Scan (1,Sec,0,0) 'Measure low level AC signal (RMY 05103) on LLAC4 wired to C7 and C8 on CR5000 TimerIO (Pulse_LLAC,11000000,88000000,10,mSec) 'NOTE: Only ports CR5000 C7 and C8 'support Function 8 (frequency in Hz). NextScan...
  • Page 12 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 = 0.0 EndIf CallTable WindSpd NextScan EndProg...
  • Page 14 Campbell Scientific Companies Campbell Scientific, Inc. (CSI) 815 West 1800 North Logan, Utah 84321 UNITED STATES www.campbellsci.com • info@campbellsci.com Campbell Scientific Africa Pty. Ltd. (CSAf) PO Box 2450 Somerset West 7129 SOUTH AFRICA www.csafrica.co.za • cleroux@csafrica.co.za Campbell Scientific Australia Pty. Ltd. (CSA)