u-blox LARA-R2 series System Integration Manual

Also see for LARA-R2 series: System integration manual

Contents

u-blox LARA-R2 series System Integration Manual Manual pdf 136 page image

LARA-R2 series - System Integration ManualUBX-16010573 - R02 Objective Specification Product testingPage 136 of 1485.2 Test parameters for OEM manufacturerBecause of the testing done by u-blox (with 100% coverage), an OEM manufacturer does not need to repeatfirmware tests or measurements of the module RF performance or tests over analog and digital interfaces in theirproduction test.An OEM manufacturer should focus on: Module assembly on the device; it should be verified that:o Soldering and handling process did not damaged the module componentso All module pins are well soldered on device boardo There are no short circuits between pins Component assembly on the device; it should be verified that:o Communication with host controller can be establishedo The interfaces between module and device are workingo Overall RF performance test of the device including antennaDedicated tests can be implemented to check the device. For example, the measurement of module currentconsumption when set in a specified status can detect a short circuit if compared with a “Golden Device” result.In addition, module AT commands can be used to perform functional tests on digital interfaces (communicationwith host controller, check SIM interface, GPIOs, etc.), on audio interfaces (audio loop for test purposes can beenabled by the AT+UPAR=2 command as described in the u-blox AT Commands Manual [2]), and to perform RFperformance tests (see the following section 5.2.2 for details).5.2.1 “Go/No go” tests for integrated devicesA “Go/No go” test is typically to compare the signal quality with a “Golden Device” in a location with excellentnetwork coverage and known signal quality. This test should be performed after data connection has beenestablished. AT+CSQ is the typical AT command used to check signal quality in term of RSSI. See the u-blox ATCommands Manual [2] for detail usage of the AT command.These kinds of test may be useful as a “go/no go” test but not for RF performance measurements.This test is suitable to check the functionality of communication with host controller, SIM card as well as powersupply. It is also a means to verify if components at antenna interface are well soldered.5.2.2 Functional tests providing RF operationThe overall RF functional test of the device including the antenna can be performed with basic instruments suchas a spectrum analyzer (or an RF power meter) and a signal generator with the assistance of AT+UTESTcommand over AT command user interface.The AT+UTEST command provides a simple interface to set the module to Rx or Tx test modes ignoring thecellular signaling protocol. The command can set the module into: transmitting mode in a specified channel and power level in all supported modulation schemes and bands receiving mode in a specified channel to returns the measured power level in all supported bandsSee the u-blox AT Commands Manual [2] and the End user test Application Note [24], for the AT+UTESTcommand syntax description and examples of use.