The shielding box uses conductive or magnetic materials to make shields of various shapes such as shells, plates, sleeves, etc., to limit the electromagnetic ability to a certain space range to suppress radiation interference with metal bodies, and to process conduction and radiation to achieve benefits. The wireless communication equipment under test provides non-interference test environment equipment. So how do we measure the shielding box? The following is introduced by the editor of the manufacturer:
Items needed for shielding box testing: network analyzer, a pair of test antennas (antennas that meet the frequency range), radio frequency cables, necessary adapters or adapter cables.
1. One end of the radio frequency line 1 is connected to the signal transmitter of the network analyzer, and the other end is connected to the external adapter (SMA or N head) of the box under test. The inside of the box is connected to the antenna A on the corresponding adapter to form the signal output terminal. One end of the radio frequency line 2 is connected to the receiving port on the network analyzer, and the other end is connected to the antenna B to form a signal receiving end.
2. Adjust to the corresponding position on the network analyzer and press'marker' to set the test frequency point, and set the frequency point to be used. (Marker generally sets the following points for testing: 800MHZ, 900MHZ, 1.8GHZ, 1.9GHZ, 2.4GHZ, 3.0GHZ, 4.0GHZ, 5.0GHZ, 5.8GHZ.)
3. After the setting is completed, the box under test is fully opened, and a pair of antennas are placed relative to each other, keeping one antenna inside the box and one antenna outside the box to form a higher reception rate. At this time, record the reading of the frequency point set by the marker , Generally between -8 to -16. At this time, close the box, separate the transmission and reception of the antenna, watch the value on the network analyzer screen, and record the corresponding frequency value at this time after it is relatively stable, and subtract the value after the box is closed from the value when the box is opened. The result is the shielding effect.