Repeatable fan airflow testing depends on sensor accuracy, position, alignment, stabilization time and minimal disturbance. An automatic scanning system moves the anemometer to programmed coordinates and completes each measurement without an operator entering the primary airflow field.

1. System Structure

The system includes an air-velocity sensor, servo positioning axis, encoder, sample platform, environmental sensors, motion controller and analysis software. A second vertical axis can be added for two-dimensional mapping of tower fans and other non-circular outlets.

2. Measurement-Point Positioning

Coordinates are created from the applicable test method and fan geometry. The controller moves the sensor to each point and stops precisely. A laser or mechanical reference can be used to align the fan axis and sensor center.

3. Automatic Acquisition

At each position, software waits for airflow stabilization and samples velocity for a defined interval. Average, maximum and fluctuation values are stored with coordinates, environmental conditions and electrical data. The system then moves automatically to the next point.

4. Procedure

1. Prepare the test room and remove airflow disturbances;
2. Install and align the fan;
3. Verify positioning origin and sensor orientation;
4. Select the measurement recipe;
5. Set movement, stabilization and sampling times;
6. Run an empty travel check;
7. Start the automatic scan;
8. Review abnormal points and generate the report.

5. Error Control

Sensor angular error, position offset, support-frame disturbance and room airflow are common sources of uncertainty. Air-conditioning flow should not enter the measurement field directly. Product changes require rechecking height, axis and distance.

6. R&D Application

Two-dimensional maps can also help engineers evaluate airflow uniformity, asymmetric flow, delivery width and tower-fan vertical distribution. The system can be linked with power, RPM and environmental measurements for fully automatic multi-speed testing.