Rohde & Schwarz to present Bluetooth® LE signaling test system
Many manufacturers of Bluetooth® Low Energy components find it challenging to test modules and sensors in compliance with the standard. These devices often have no port or interface to connect to a control line for testing them in direct test mode (DTM) as stipulated by the Bluetooth® LE standard. The CMW test platform from Rohde & Schwarz now enables over-the-air (OTA) tests as well as conducted measurements on these devices.
When drafting the BLE test specifications in 2010, Bluetooth SIG specified a direct test mode (DTM, non-signaling) but did not specify an OTA signaling test mode. DTM requires a dedicated control line to be connected to the device under test. The control line, however, does not allow RF tests under realistic conditions since the measured RF characteristics are distorted compared with a realistic test. Testing BLE components in direct test mode at the board level during development is a complicated but feasible task. In contrast, it is difficult or even impossible to carry out DTM RF tests in production and for OTA applications, e.g., in shielded chambers. Many BLE devices offer no port or interface to connect to a control line but nevertheless need to be tested under realistic conditions. The CMW test platform claims to be the first solution for BLE RF signaling tests under realistic conditions.
The BLE signaling test system from Rohde & Schwarz makes it possible to determine the RF characteristics of a Bluetooth LE device via a Bluetooth OTA link or over a wired connection to the antenna. With this approach, users can, for example, measure the level, modulation and receiver characteristics of individual or all data channels for frequency-hopping transmissions, which are typical of Bluetooth. Rohde & Schwarz also offers an advertiser testing option for its CMW test platform to measure the RF parameters of advertiser channels. The BLE signaling functionality enhances the BLE direct test mode and the BLE advertiser mode. With these functionalities, it is now possible to solve even complex measurement tasks in development, production and for OTA applications. With the CMW, users can now choose among all three BLE RF test modes to match their respective applications. That makes the CMW platform a safe investment also for future Bluetooth developments.
The CMW test platform delivers the full range of Bluetooth RF tests, including Bluetooth Classic, Bluetooth LE and the latest standard, Bluetooth 5.03. Along with signaling tests and tests in direct test mode, the CMW enables diverse audio tests on Bluetooth Basic Rate/Enhanced Data Rate (BR/EDR) links. The CMW test platform is especially suited for tests during development, for pre-conformance tests, qualified audio tests and Bluetooth OTA tests.
At Bluetooth World, Rohde & Schwarz is showcasing its CMW270 wireless connectivity tester. It relies on a parametric test concept that allows users to create and execute customized test sequences. The tester’s bandwidth has been extended to 160 MHz. That also enables WLAN RF signaling tests covering the IEEE 802.11a/b/g/n/ac and IEEE 802.11ax standards. RF tests to IEEE 802.15.4 for Zigbee and Thread components are also available.
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