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PLEASE READ FIRST 

About this manual 

Please note that this manual was originally produced by Campbell Scientific Inc. primarily for the 
North American  market. Some spellings, weights and measures may reflect this origin. 

Some useful conversion factors: 

Area:

   1 in

2

 (square inch) = 645 mm

2

 

 
Length:    

1 in. (inch) = 25.4 mm 

                  1 ft (foot) = 304.8 mm 
                  1 yard = 0.914 m 
                  1 mile = 1.609 km 
 
 

Mass:

   

 1 oz. (ounce) = 28.35 g 

 

1 lb (pound weight) = 0.454 kg 

 

Pressure:

 

1 psi (lb/in

2

) = 68.95 mb 

 

Volume:

 

1 UK pint = 568.3 ml 

 1 

UK 

gallon 

= 4.546 litres 

 

1 US gallon = 3.785 litres 

 

In addition, while most of the information in the manual is correct for all countries, certain information 
is specific to the North American market and so may not be applicable to European users.  

Differences include the U.S standard external power supply details where some information (for 
example the AC transformer input voltage) will not be applicable for British/European use. 

Please 

note, however, that when a power supply adapter is ordered it will be suitable for use in your country. 

Reference to some radio transmitters, digital cell phones and aerials may also not be applicable 
according to your locality. 

Some brackets, shields and enclosure options, including wiring, are not sold as standard items in the 
European market; in some cases alternatives are offered. Details of the alternatives will be covered in 
separate manuals. 

Part numbers prefixed with a “#” symbol are special order parts for use with non-EU variants or for 
special installations. Please quote the full part number with the # when ordering. 

Recycling information 

At the end of this product’s life it should not be put in commercial or domestic refuse 
but sent for recycling.  Any batteries contained within the product or used during the 
products life should be removed from the product and also be sent to an appropriate 
recycling facility. 

 

Campbell Scientific Ltd can advise on the recycling of the equipment and in some cases 
arrange collection and the correct disposal of it, although charges may apply for some 
items or territories.  

  

 

For further advice or support, please contact Campbell Scientific Ltd, or your local agent. 

 

 
 

Campbell Scientific Ltd, Campbell Park, 80 Hathern Road, Shepshed, Loughborough, LE12 9GX, UK 

Tel: +44 (0) 1509 601141    Fax: +44 (0) 1509 601091  

Email: [email protected] 

www.campbellsci.co.uk 

Summary of Contents for LLAC4

Page 1: ...LLAC4 Four Channel Low Level AC Conversion Module Instruction Manual 23 4 12 Copyright 2004 2012 Campbell Scientific Inc Printed under Licence by Campbell Scientific Ltd CSL 124 ...

Page 2: ......

Page 3: ...he repair is under guarantee or not Please state the faults as clearly as possible and if the product is out of the guarantee period it should be accompanied by a purchase order Quotations for repairs can be given on request It is the policy of Campbell Scientific to protect the health of its employees and provide a safe working environment in support of this policy a Declaration of Hazardous Mate...

Page 4: ......

Page 5: ...al cell phones and aerials may also not be applicable according to your locality Some brackets shields and enclosure options including wiring are not sold as standard items in the European market in some cases alternatives are offered Details of the alternatives will be covered in separate manuals Part numbers prefixed with a symbol are special order parts for use with non EU variants or for speci...

Page 6: ......

Page 7: ...e 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 8: ...This is a blank page ...

Page 9: ...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 Compatible wind sensors include but are not limited to the 05103 Wind Monitor 05106 Wind Monitor MA 05305 Wind Monitor AQ 03001 Wind Sentry Set and 03101 Wind Sentry Anemometer LLAC4 MADE IN USA SN P1 P2 P3 P4 12V G D1 D2...

Page 10: ...output where the frequency is proportional to the speed of rotation This AC signal is induced in a stationary coil by a magnet mounted on a rotating shaft 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 o...

Page 11: ...be appropriate choices 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 This power should come from the datalogger or the datalogger s power supply A low level AC signal on P...

Page 12: ...ery G Black G G D1 White C5 PLL D2 Green C6 C1 SDI 12 D3 Yellow C7 C2 D4 Blue C8 P_SW G Clear G G CR1000 Example Program CR1000 Series Datalogger LLAC4 Sample Program Record 10 minute average wind speed in m s for 1 RM Young 05103 L Wind Monitor Anemometer 1 RM Young 05106 L Marine Wind Monitor Anemometer 1 RM Young 05305 L AQ Wind Monitor Anemometer 1 RM Young 03101 L Wind Sentry Anemometer Decla...

Page 13: ...ries Datalogger LLAC4 Sample Program Record 10 minute average wind speed in m s for 1 RM Young 05103 L Wind Monitor Anemometer 1 RM Young 05106 L Marine Wind Monitor Anemometer 1 RM Young 05305 L AQ Wind Monitor Anemometer 1 RM Young 03101 L Wind Sentry Anemometer Declare Public Variables Public RMY05103WS Public RMY05106WS Public RMY05305WS Public RMY03101WS Define Data Tables DataTable WindSpd 1...

Page 14: ...LLAC4 Four Channel Low Level AC Conversion Module 6 RMY03101WS 0 0 EndIf CallTable WindSpd NextScan EndProg ...

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Page 16: ...berta T5M 1W7 CANADA www campbellsci ca dataloggers campbellsci ca Campbell Scientific Centro Caribe S A CSCC 300N Cementerio Edificio Breller Santo Domingo Heredia 40305 COSTA RICA www campbellsci cc info campbellsci cc Campbell Scientific Ltd CSL Campbell Park 80 Hathern Road Shepshed Loughborough LE12 9GX UNITED KINGDOM www campbellsci co uk sales campbellsci co uk Campbell Scientific Ltd Franc...

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