Increases number of signals datalogger can monitor
Overview
The LLAC4 is a small peripheral that increases the number of low-level ac signals a datalogger can monitor. The LLAC4 is often used to measure up to four anemometers, and it is especially useful for wind profiling applications.
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Benefits and Features
- Ideal for applications that require high numbers of pulse channels, but fewer control ports, such as in wind prospecting
Images
3D/CAD Files:
Detailed Description
The LLAC4 enables four datalogger control ports to emulate pulse-counting channels by converting the low-level ac signals to logic levels read by the control ports.
Minimum AC Input Voltage versus Output Square Wave Frequency
| Input Sine Wave (mV RMS) |
Output Range (Hz) |
| 20 | 1.0 to 20 |
| 200 | 0.5 to 200 |
| 2000 | 0.3 to 10,000 |
| 5000 | 0.3 to 20,000 |
Specifications
| Function | Increases the number of low-level ac signals that a data logger can monitor. |
| Number of Channels | 4 |
| Power | 0.1 mA (@ 12 Vdc) |
| Input Hysteresis | 16 mV (@ 1 Hz) |
| AC Coupling Removal of DC Offset | ≤ ±0.5 V |
| Maximum AC Input Voltage | ±20 V |
| Cable Length | 0.6 m (2 ft) |
| Dimensions |
|
| Weight | 92 g (3.2 oz) |
Compatibility
Please note: The following shows notable compatibility information. It is not a comprehensive list of all compatible products.
Dataloggers
| Product | Compatible | Note |
|---|---|---|
| 21X (retired) | ||
| CR10 (retired) | ||
| CR1000 (retired) | ||
| CR1000X | ||
| CR10X (retired) | ||
| CR200X (retired) | To be compatible with the CR200X, the low-level ac signals must not exceed 1 kHz. | |
| CR211X (retired) | To be compatible with the CR211X, the low-level ac signals must not exceed 1 kHz. | |
| CR216X (retired) | To be compatible with the CR216X, the low-level ac signals must not exceed 1 kHz. | |
| CR23X (retired) | ||
| CR300 | ||
| CR3000 (retired) | ||
| CR310 | ||
| CR350 | ||
| CR500 (retired) | ||
| CR5000 (retired) | ||
| CR510 (retired) | ||
| CR6 | ||
| CR800 (retired) | ||
| CR850 (retired) | ||
| CR9000 (retired) | ||
| CR9000X (retired) | It is necessary to use the CR9071E module with the CR9000X and LLAC4. |
Miscellaneous
| Product | Compatible | Note |
|---|---|---|
| 014A-L | ||
| 03101-L | ||
| 05103-45-L | ||
| 05106-L | ||
| 05305-L |
Additional Compatibility Information
Data Logger Considerations
The LLAC4 works only with data loggers whose control ports can accept high frequency pulses. The CR23X has four control ports that can be used (5, 6, 7, and 8); the CR200X-series control ports are compatible but are limited to inputs of 1 kHz.
Sensors
The LLAC4 typically measures anemometers. Compatible anemometers include the Wind Monitors, 03002 Wind Sentry Set, and 03101 Wind Sentry Anemometer. (The 014A Anemometer and 034B Windset are not compatible.) The LLAC4 can also measure other sensors that output pulse counting signals.
Documents
Downloads
LLAC4 Program Example (2 KB) 21-05-2024
Description: Includes two programs, one for a CR1000X and one for a CR350. Both programs measure three different wind speed sensors that produce low-level AC signals. The sensors used are the RM Young 05103 and RM Young 05305 propeller-type anemometers, as well as the RM Young 03101 cup anemometer.
Listed Under
- 05108-L - Heavy Duty Wind Monitor
- 05305-L - RM Young Wind Monitor AQ
- 05106-L - Wind Monitor, Marine Version
- 05103-45-L - Wind Monitor, Alpine Version
- 03002-L - Wind Sentry Set
- 05103-L - Wind Monitor
- P2546C-L - Three-Cup Anemometer with MEASNET Calibration (coil version)
- 03101-L - Wind Sentry Anemometer
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