What is the effective reading distance of the card reader? What will affect the reading distance of the card reader?

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Q: What is the effective reading distance of the card reader? What will affect the reading distance of the card reader?
The standard reading distance of the micro-tillage card reader is 4-10 cm, the reading distance of the ID card reader is slightly longer, and the reading distance of the IC card is slightly shorter. If you use a keychain-type proximity card, the reading distance will be shorter - generally 1-3 cm. Micro-till does not unilaterally pursue the card reading distance, but pays more attention to the stability of the card reader. Micro-till products do not
The card is read in the critical area of the card reading magnetic field, but the card is read in the area with the most sufficient magnetic field energy to increase its stability. If the reading distance of the card reader is too long, it is not suitable for access control needs, and two card readers that are too close will interfere with each other.
The way to read the card, it is recommended to use the card facing each other. If the card is read naturally, it is not advisable to use the card to quickly swipe the card from the side, and the success of the card cannot be guaranteed.
The card reader is installed on a metal surface. Since the card reader is a radio frequency product, the metal pair near the front or the rear will absorb its radio frequency signal. If the metal surface is large, it will even affect the card reader not being able to read the card. Or the card reading distance is attenuated very much. In addition, the distance between the two card readers will also affect the
Some card readers will shorten the reading distance, and some will cause two card readers to read cards at the same time. The solution is: try not to install it on a metal plane, or dig out the metal part of the card reader installation back, or raise the card reader 1-2 cm on the metal surface, and keep the distance between the card readers at 25cm
above.