HTOT840

Rev. 1.1

1996-11-22

Htot840.doc/HS

Page 6 of 9

4.1. Tuning HITAG Long Range Antennas

The device has to be switched to long range mode.

The current should be about 200 mA, a tolerance of

± 10 mA is acceptable.

A current below the tolerance limit implies, that the antenna is badly detuned.

If the current is over the upper tolerance limit you should check the output current of the

read/write device. It should be 200 mA

± 10 mA. Otherwise the function of the read/write

device should be checked.

For tuning of the antenna refer to the measured phase. The phase should be 0°

± 15° (at a

current of 200 mA).

• If the phase is too high (direction: inductive) the tuning capacity has to be

decreased.

• If the phase is too low (direction: capacitive) the tuning capacity has to be

increased.

After tuning of the antenna the tuning device should be removed.

4.2. Tuning HITAG Proximity Antennas

The device has to be switched to proximity mode (changing the sensitivity).

For tuning of the antenna refer to the measured phase. The phase should be 0°

± 10°.

• If the phase is too high (direction: inductive) the tuning capacity has to be

decreased.

• If the phase is too low (direction: capacitive) the tuning capacity has to be

increased.

For HITAG proximity systems the current reaches its maximum when the

antenna is tuned exactly. An approximate value for the current is:

60 to 70 mA

± 10 mA.