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RF Shield Box for cellular phone testing |
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New Shield Box Meets High Volume Testing of Service Centres and Manufacturers |
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Willtek’s 4921 Shield Box is a new RF shielding solution for testing 3G mobile phones, as well as data cards and WLAN equipment in large service centres and production lines. The 4921 is the optimum solution for service centres and manufacturers with high volume phone testing because it can endure the high open/close rates involved. The RF Shield is designed to eliminate interference from any adjacent mobile phones, the local base station, and to isolate the environment from the RF emitted from the phone (or other device under test).
Stringent Shielding Requirements for 3G Mobile Phone Testing
Most third-generation (3G) mobile phone systems are based on CDMA technology, which puts new demands on test environments. The 4921 easily fulfils the 80 dB attenuation requirement for testing mobile phones for UMTS and other third-generation wireless networks. The RF absorption inside the 4921 leads to low reflection within the box, thereby providing high-precision, stable RF measurement results with instruments connected to it. The 4921 is the first of its kind to meet all the service, repair and manufacturing requirements in terms of attenuation, longevity, dimensions, and price |
4921 RF Shield
Easy-to-Use Solution for High-Volume Testing
Most third-generation (3G) mobile phone systems are based on CDMA technology, which puts new demands on test environments compared to TDMA systems. Measurements in CDMA systems require 80 dB of shielding because the mobile will attempt to lock onto the strongest base station. Without the RF Shield, the mobile would ignore the test signal and try to lock onto a local network.
In a CDMA system, for example WCDMA (UMTS), one of the worst-case shielding requirements arises when one mobile is in a max power test, and the other mobile is in a minimum power test. In this situation, one mobile is transmitting at +33 dBm, while the other is attempting to transmit -50 dBm. To properly isolate the two mobiles from each other, test stations will require at least 80 dB of isolation between them.
In addition, a receiver test close to the sensitivity level of the mobile receiver could severely affect test results. Testing the receiver via the antenna requires the phone to be isolated from a real base station by 80 dB. Without shielding, the mobile could receive the signal from a close-by network transmitter at –25 dBm while trying to detect a test signal at –104 dBm.
For service centres and manufacturing operations, the Willtek 4921 is the optimum solution because of its reliability, longevity and support in measurement precision. This has been verified through a series of endurance tests, and in line with military standard VG 95737, Electromagnetic Compatibility of Equipment – Part 15 Test Methods for Coupling and Shielding.
The 4921 is an easy-to-use solution with a solid rocker arm lever and gas springs that allow the operator to smoothly open and close the box without using much force. A removable plate on the rear can be used to hold customer-specific connectors (such as an interface for remote-controlling the unit under test). The 4921 is designed to contain the phone under test and possibly an antenna coupler, and provides a connector for external test equipment (such as the Willtek 4400 Mobile Phone Tester).
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