1. Introduzione e oltreview
The BTMETER BT-866A Pro is a versatile handheld digital anemometer designed for precise measurement of various environmental parameters. This 5-in-1 device accurately measures wind speed, wind temperature, wind flow (CFM), relative humidity (%RH), and dew point. It is an essential tool for HVAC system balancing, environmental monitoring, outdoor activities, and industrial applications. The device features a large backlit display, data hold function, Max/Min measurement, and USB connectivity for PC data logging and analysis.
2. Contenuto della confezione
Dopo aver disimballato, verificare che tutti gli articoli elencati di seguito siano presenti e in buone condizioni:
- 1 x BTMETER BT-866A Pro Digital Anemometer
- 2 batterie AAA da 1.5 V
- 1 cavo USB
- 1 x PC Software CD
- 1 x cinturino da polso
- 1 custodia protettiva
- 1 x Manuale utente

Figure 2.1: Contents included in the BTMETER BT-866A Pro Anemometer package.
3. Caratteristiche e componenti del prodotto
The BT-866A Pro Anemometer integrates multiple measurement capabilities and user-friendly features:
- Misurazione 5 in 1: Wind Speed, Wind Temperature, Wind Flow (CFM), Relative Humidity, and Dew Point.
- Alta precisione: Measures wind speed from 0.3 to 40 m/s with an accuracy of +/- 2.0% + 50.
- Sensitive Vanes: Equipped with 8 sensitive vanes for accurate low wind speed detection.
- Dual Wind Chill Sensor: Per letture precise della temperatura.
- Ampio display LCD retroilluminato: Display da 1.5 pollici per letture chiare in diverse condizioni di illuminazione.
- Data Hold: Blocca la lettura corrente sul display.
- Misurazione Max/Min: Registra i valori massimi e minimi durante una sessione di misurazione.
- Unità multiple: Supports various units for wind speed (m/s, km/h, ft/min, knots, mph, fpm), temperature (°C, °F), and airflow (CFM, CMM).
- Connettività USB: Allows connection to a PC for data logging, analysis, and monitoring.
- Spegnimento automatico: Conserva la durata della batteria spegnendosi automaticamente dopo 10 minuti di inattività.
- Indicatore di batteria scarica: Avvisa quando è necessario sostituire la batteria.
- Supporto per treppiede: Features a metal screw hole at the bottom for tripod attachment (tripod not included) for hands-free operation.

Figura 3.1: Oltreview of the BTMETER BT-866A Pro Anemometer and its primary functions.

Figure 3.2: Key buttons and their functions on the BT-866A Pro Anemometer.
4. Impostazione
4.1 Installazione della batteria
- Individuare il coperchio del vano batteria sul retro del dispositivo.
- Aprire il coperchio facendolo scorrere o svitandolo.
- Inserire due batterie AAA da 1.5 V, assicurandosi della corretta polarità (+/-).
- Riposizionare saldamente il coperchio del vano batteria.
4.2 Accensione/Spegnimento
Premere e tenere premuto il tasto ACCESO/SPENTO button (usually the central red button) for approximately 3 seconds to turn the device on or off.
4.3 Initial Unit Selection
After powering on, you may select your preferred units for measurement. Refer to Section 5.2 for detailed instructions on unit selection.
4.4 Tripod Mounting (Optional)
For stable, hands-free measurements, the BT-866A Pro can be mounted on a standard tripod. Locate the metal screw hole at the bottom of the device and attach it to a compatible tripod. Ensure the device is securely fastened before use.

Figure 4.1: The BT-866A Pro Anemometer with optional tripod mounting.
5. Istruzioni per l'uso
5.1 Misurazione di base
Once powered on, the device will display real-time readings. Position the anemometer so that the wind flows directly through the 8-leaf wind wheel for accurate measurements. The display will show wind speed, temperature, and other selected parameters.
5.2 Selezione delle unità
Premere il tasto UNITÀ button to cycle through available units for wind speed (m/s, km/h, ft/min, knots, mph, fpm) and temperature (°C, °F). For airflow (CFM), the unit is typically displayed directly.
5.3 Funzione di conservazione dei dati
Premere il tasto HOLD/MODALITÀ button briefly to freeze the current reading on the display. Press it again to release the hold and resume real-time measurements.
5.4 Max/Min Measurement
Premere il tasto Massimo/minimo pulsante per view the maximum or minimum recorded values during the current measurement session. Press repeatedly to cycle between MAX, MIN, and current readings.
5.5 Humidity Mode (Dew Point & Wet Bulb)
Premere a lungo il tasto HOLD/MODALITÀ button to switch to Humidity Mode, which displays Dew Point and Wet Bulb temperatures. Long press again to exit this mode.
5.6 Pulsante FUNC
Premere a lungo il tasto FUNC button for 3 seconds to enable or disable the "Auto Power Off" feature. A short press of the FUNC button allows you to switch between different measurement modes (Wind Speed, Wind Flow, and input dimensions for CFM calculation).
5.7 CFM Measurement
The anemometer displays CFM values directly. For accurate CFM readings, ensure the device is positioned correctly within the airflow. If manual input for duct dimensions is required, use the FUNC button to access dimension settings.

Figure 5.1: CFM measurement display and measurement ranges.
6. Data Logging (USB PC Sync)
The BT-866A Pro supports data logging to a PC for detailed analysis and monitoring. This feature is particularly useful for long-term observation or when detailed reports are required.
- Install the provided PC software from the included CD onto your computer.
- Connect the anemometer to your PC using the supplied USB cable.
- Launch the PC software. The software will allow you to monitor and record wind speed, wind flow, CFM, humidity, and temperature data in real-time.
- The software can generate graphs and reports for comprehensive data analysis.

Figure 6.1: USB connection to PC for data logging and analysis.
7. Measurement Tips for Temperature and Relative Humidity
For accurate temperature and relative humidity (%RH) readings, consider the following:
- The temperature sensors are located within the left and right holes of the device.
- To ensure accurate readings, especially for temperature, shade the sensors from direct sunlight.
- Ensure there is adequate airflow across the sensors. Without sufficient airflow, temperature and %RH readings may change slowly or inaccurately reflect the ambient conditions. Allow time for the sensors to stabilize in the measurement environment.
8. Specifiche
| Parametro | Valore |
|---|---|
| Numero di modello | Modello BT-866A |
| Gamma di velocità del vento | 0.3 ~ 40 m / s |
| Precisione della velocità del vento | +/- 2.0% + 50 |
| Unità di velocità del vento | m/s, km/h, ft/min, knots, mph, fpm |
| Intervallo di temperatura | -22 ° F ~ 140 ° F (-30 ° C ~ 60 ° C) |
| Unità di temperatura | °C, °F |
| Air Flow (CFM) Range | 0 ~ 999900 ft³/min |
| Intervallo di umidità relativa | 0% ~ 100% UR |
| Misurazione del punto di rugiada | SÌ |
| Display | LCD retroilluminato da 1.5 pollici |
| Fonte di alimentazione | 2 batterie AAA da 1.5 V |
| Spegnimento automatico | After 10 minutes of inactivity (configurable) |
| Connettività | USB for PC data logging |
| Materiale | Acrilonitrile Butadiene Stirene (ABS) |
| Dimensioni (L x P x A) | 8.64 x 3.81 x 16.51 cm (3.4 x 1.5 x 6.5 pollici) |
| Peso | 200 grammi |
9. Manutenzione
Proper maintenance ensures the longevity and accuracy of your BTMETER BT-866A Pro Anemometer.
- Pulizia: Use a soft, dry cloth to clean the device. Do not use abrasive cleaners or solvents. Keep the wind wheel and sensor areas free from dust and debris.
- Magazzinaggio: Quando non si utilizza il dispositivo per lunghi periodi, rimuovere le batterie per evitare perdite. Conservare il dispositivo nella sua custodia protettiva in un luogo fresco e asciutto, lontano dalla luce solare diretta e da temperature estreme.
- Sostituzione della batteria: Replace batteries promptly when the low battery indicator appears to ensure continuous accurate operation.
- Cura del sensore: Avoid touching the wind wheel vanes or internal sensors directly. Handle the device with care to prevent damage to the sensitive components.
10. Risoluzione Dei Problemi
If you encounter issues with your BT-866A Pro Anemometer, refer to the following common problems and solutions:
| Problema | Possibile causa | Soluzione |
|---|---|---|
| Il dispositivo non si accende | Batterie scariche o esaurite; installazione errata delle batterie. | Sostituire le batterie con batterie nuove, assicurandosi che la polarità sia corretta. |
| Letture imprecise della velocità del vento | Obstruction of wind wheel; incorrect positioning; damaged vanes. | Ensure wind wheel is clear and rotates freely. Position the device directly into the airflow. Check for physical damage. |
| Letture imprecise di temperatura/umidità | Sensors exposed to direct sunlight; insufficient airflow over sensors; sensors obstructed. | Shade the device from direct sunlight. Ensure adequate airflow around the sensor holes. Clear any obstructions. Allow time for readings to stabilize. |
| PC software not detecting device | USB cable not connected properly; software not installed correctly; driver issues. | Ensure USB cable is securely connected to both device and PC. Reinstall PC software and drivers if necessary. Try a different USB port. |
| Il display è scuro o tremolante | Batteria scarica. | Sostituire le batterie. |
11. Garanzia e supporto
BTMETER products are manufactured to high-quality standards. This product is covered by a standard manufacturer's warranty against defects in materials and workmanship. For specific warranty details, please refer to the warranty card included with your product or contact BTMETER customer support.
If you require technical assistance, have questions about product operation, or need to report a defect, please contact BTMETER customer support through the official website or the contact information provided in your product packaging. Please have your model number (BT-866A Pro) and purchase details ready when contacting support.