1. Introduksjon og overview
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. Pakkens innhold
Ved utpakking, vennligst kontroller at alle varene som er oppført nedenfor er til stede og i god stand:
- 1 x BTMETER BT-866A Pro Digital Anemometer
- 2 x 1.5V AAA-batterier
- 1 x USB-kabel
- 1 x PC Software CD
- 1 x håndstropp
- 1 x beskyttelsespose
- 1 x brukerhåndbok

Figure 2.1: Contents included in the BTMETER BT-866A Pro Anemometer package.
3. Produktegenskaper og komponenter
The BT-866A Pro Anemometer integrates multiple measurement capabilities and user-friendly features:
- 5-i-1-måling: Wind Speed, Wind Temperature, Wind Flow (CFM), Relative Humidity, and Dew Point.
- Høy presisjon: 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: For precise temperature readings.
- Stor bakgrunnsbelyst LCD-skjerm: 1.5-inch display for clear readings in various lighting conditions.
- Data Hold: Fryser gjeldende avlesning på displayet.
- Max/Min Measurement: Registrerer maksimums- og minimumsverdier under en måleøkt.
- Flere enheter: Supports various units for wind speed (m/s, km/h, ft/min, knots, mph, fpm), temperature (°C, °F), and airflow (CFM, CMM).
- USB-tilkobling: Allows connection to a PC for data logging, analysis, and monitoring.
- Automatisk avslåing: Sparer batterilevetid ved å slå seg av automatisk etter 10 minutter med inaktivitet.
- Indikator for lavt batteri: Varsler når batteribytte er nødvendig.
- Stativfeste: Features a metal screw hole at the bottom for tripod attachment (tripod not included) for hands-free operation.

Figur 3.1: Overview 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. Oppsett
4.1 Installasjon av batteri
- Finn batteridekselet på baksiden av enheten.
- Open the cover by sliding or unscrewing it.
- Sett inn to 1.5 V AAA-batterier, og sørg for riktig polaritet (+/-).
- Sett batteridekselet godt på plass.
4.2 Slå på/av
Trykk og hold inne PÅ/AV button (usually the central red button) for approximately 3 seconds to turn the device on or off.
4.3 Førstegangsvalg av enhet
After powering on, you may select your preferred units for measurement. Refer to Section 5.2 for detailed instructions on unit selection.
4.4 Montering på stativ (valgfritt)
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. Bruksanvisning
5.1 Grunnleggende måling
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 Valg av enhet
Trykk på ENHET 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 Dataholdingsfunksjon
Trykk på HOLD/MODUS button briefly to freeze the current reading on the display. Press it again to release the hold and resume real-time measurements.
5.4 Maks/min-måling
Trykk på MAX/MIN knappen til 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)
Trykk lenge på HOLD/MODUS button to switch to Humidity Mode, which displays Dew Point and Wet Bulb temperatures. Long press again to exit this mode.
5.6 FUNC-knapp
Trykk lenge på FUNK button for 3 seconds to enable or disable the "Auto Power Off" feature. A short press of the FUNK 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 FUNK 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. Spesifikasjoner
| Parameter | Verdi |
|---|---|
| Modellnummer | BT-866A |
| Vindhastighetsområde | 0.3 ~ 40 m / s |
| Vindhastighetsnøyaktighet | +/- 2.0% + 50 |
| Vindhastighetsenheter | m/s, km/h, ft/min, knots, mph, fpm |
| Temperaturområde | -22 ° F ~ 140 ° F (-30 ° C ~ 60 ° C) |
| Temperaturenheter | °C, °F |
| Air Flow (CFM) Range | 0 ~ 999900 ft³/min |
| Relativ fuktighetsområde | 0 % ~ 100 % RF |
| Duggpunktmåling | Ja |
| Utstilling | 1.5-tommers bakgrunnsbelyst LCD-skjerm |
| Strømkilde | 2 x 1.5V AAA-batterier |
| Automatisk avslåing | After 10 minutes of inactivity (configurable) |
| Tilkobling | USB for PC data logging |
| Materiale | Akrylnitrilbutadienstyren (ABS) |
| Dimensjoner (L x B x H) | 8.64 x 3.81 x 16.51 cm (3.4 x XUMX x 1.5 inches) |
| Vekt | 200 gram |
9. Vedlikehold
Proper maintenance ensures the longevity and accuracy of your BTMETER BT-866A Pro Anemometer.
- Rengjøring: 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.
- Lagring: When not in use for extended periods, remove the batteries to prevent leakage. Store the device in its protective pouch in a cool, dry place, away from direct sunlight and extreme temperatures.
- Batteribytte: Replace batteries promptly when the low battery indicator appears to ensure continuous accurate operation.
- Sensorpleie: Avoid touching the wind wheel vanes or internal sensors directly. Handle the device with care to prevent damage to the sensitive components.
10. Feilsøking
If you encounter issues with your BT-866A Pro Anemometer, refer to the following common problems and solutions:
| Problem | Mulig årsak | Løsning |
|---|---|---|
| Enheten slås ikke på | Lave eller døde batterier; feil batteriinstallasjon. | Bytt ut batteriene med nye, og sørg for riktig polaritet. |
| Inaccurate wind speed readings | 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. |
| Unøyaktige temperatur-/fuktighetsavlesninger | 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. |
| Skjermen er svak eller flimrer | Lavt batteri. | Bytt batterier. |
11. Garanti og støtte
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.