Integration Manual

LISA-U2 series - System Integration Manual
UBX-13001118 - R25 Product Testing Page 163 of 182
5.2 Test parameters for OEM manufacturer
Because of the testing done by u-blox (with 100% coverage), an OEM manufacturer does not need to
repeat firmware tests or measurements of the module RF performance or tests over analog and
digital interfaces in their production test.
An OEM manufacturer should focus on:
 Module assembly on the device; it should be verified that:
o The soldering and handling process did not damaged the module components
o All module pins are well soldered on the device board
o There are no short circuits between pins
 Component assembly on the device; it should be verified that:
o Communication with the host controller can be established
o The interfaces between the module and the device are working
o Overall RF performance test of the device including antenna
Dedicated tests can be implemented to check the device. For example, the measurement of module
current consumption when set in a specified status can detect a short circuit if compared with a
“Golden Device” result.
Module AT commands are used to perform functional tests (communication with host controller,
check the SIM card interface, check the communication between module and GNSS, GPIOs, etc.) and
to perform RF performance tests.
5.2.1 ‘Go/No go’ tests for integrated devices
A ‘Go/No go’ test is to compare the signal quality with a “Golden Device” in a position with excellent
2G/3G network coverage and after having dialed a call (see the u-blox AT Commands Manual [2],
AT+CSQ command: <rssi>, <ber> parameters).
☞ 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 communication with the host controller and SIM card, the audio and
power supply functionality, and verify if components at the antenna interface are well soldered.
5.2.2 Functional tests providing RF operation
Overall RF performance test of the device including antenna can be performed with basic instruments
such as a spectrum analyzer (or an RF power meter) and a signal generator using the AT+UTEST
command over the AT interface.
The AT+UTEST command gives a simple interface to set the module to Rx and Tx test modes ignoring
the 2G/3G signaling protocol. The command can set the module:
 Into transmitting mode in a specified channel and power level in all supported modulation schemes
(single slot GMSK, single slot 8PSK, WCDMA) and 2G, 3G bands
 Into receiving mode in a specified channel to return the measured power level in all supported
bands 2G, 3G
☞ See the u-blox AT Commands Manual [2] for the AT+UTEST command syntax description.
☞ See the End user test Application Note [19] for the AT+UTEST command user guide, limitations
and examples of use.