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HT OT840
HITAG
TM
Antenna Tuning Device
November 1996
Product Specification Revision 1.1
HTOT840
Rev. 1.1
1996-11-22
Contents
Contents .................................................................................................................... 2 1. General Remarks .................................................................................................. 3 2. Specifications ....................................................................................................... 3 3. Ordering Information ............................................................................................ 4 4. Using the HITAG Antenna Tuning Device........................................................... 5 4.1. Tuning HITAG Long Range Antennas ...................................................................... 6 4.2. Tuning HITAG Proximity Antennas .......................................................................... 6
Author: Renate Rossoll
HTOT840.doc/HS
Page 2 of 9
HTOT840
Rev. 1.1
1996-11-22
1.
General Remarks
For optimal performance HITAG antennas have to be tuned during production, respectively by start-up or, for service purposes, during operation. The HITAG Antenna Tuning Device is a very easy to handle and cost effective solution for the tuning of 125 kHz HITAG antennas. The device is - besides the HITAG antenna training - the optimal complement for antenna design. The HT OT840 therefore is an unrenouncable tool for everybody who designs, produces or even uses HITAG antennas. The HITAG Antenna Tuning Device can be used for tuning HITAG long range as well as HITAG proximity antennas.
2.
Specifications
0 .. 50C IP40 measuring current: class 5 measuring phase: class 10 50 parts of scale are 50 (for rough tuning of an antenna with L 1 mH and Q 40.) three-pole DIN - connectors
* temperature range: * protection class: * precision at room temperature: * phase sensitivity: * connection:
100 0
200 300
mA
40 50 -
30
0 20 10
10 20
30
40 50 +
cap
deg
ind
HTOT840.doc/HS
Page 3 of 9
HTOT840
Rev. 1.1
1996-11-22
3.
Ordering Information
Description HITAG Antenna Tuning Device Ordering Number 9352 341 60122
Type Name HT OT840
HTOT840.doc/HS
Page 4 of 9
HTOT840
Rev. 1.1
1996-11-22
4.
Using the HITAG Antenna Tuning Device
The HITAG Antenna Tuning Device is a combined current- and phase measurement device. It can be used for tuning HITAG long range as well as HITAG proximity antennas. Selection between long range and proximity is done with the help of a switch. The tuning device is connected between antenna and read/write device as described in the following: The cable with plug (DIN 41524) has to be connected to the read/write device, the antenna cable is to be connected to the jack (DIN 41524) of the tuning device.
Adapters - if they are necessary - e.g. for connection of a proximity system, can be built up very easily. Pin assignment of the DIN connectors: Pin 1: Ground Pin 2: Rx (not used for long range antennas) Pin 3: Tx Moreover, the cable with one of the two DIN connectors (plugs) can be used to build up an adapter. After connection of the Antenna Tuning Device the operation mode (proximity or long range) has to be chosen with the help of the switch. Afterwards power supply and read/write device can be switched on.
HTOT840.doc/HS
Page 5 of 9
HTOT840
Rev. 1.1
1996-11-22
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.
HTOT840.doc/HS
Page 6 of 9
HTOT840
Rev. 1.1
1996-11-22
Definitions
Data sheet status Objective specification This data sheet contains target or goal specifications for product development. Preliminary specification Product specification Limiting values Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). Stress above one or more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation of the device at these or at any other conditions above those given in the Characteristics section of the specification is not implied. Exposure to limiting values for extended periods may affect device reliability. Application information Where application information is given, it is advisory and does not form part of the specification. This data sheet contains preliminary data; supplementary data may be published later. This data sheet contains final product specifications.
Life support applications
These products are not designed for use in life support appliances, devices, or systems where malfunction of these products can reasonably be expected to result in personal injury. Philips Semiconductors customers using or selling these products for use in such applications do so on their own risk and agree to fully indemnify Philips Semiconductors for any damages resulting from such improper use or sale.
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Philips Semiconductors - a worldwide company
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For all other countries apply to: Philips Semiconductors, Marketing & Sales Communications, http://www.semiconductors.philips.com Building BE-p, P.O.Box 218, 5600 MD EINDHOVEN, The Netherlands, Fax: +3140 27 24825 (c) Philips Electronics N.V. 1996 All rights are reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without any notice. No liability will be accepted by the publisher for any consequence of its use. Publication thereof does not convey nor imply any license under patent- or other industrial or intellectual property rights. Internet:
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