Integration Manual
SARA-R4/N4 series - System Integration Manual
UBX-16029218 - R11 Product testing Page 139 of 157
5.2 Test parameters for OEM manufacturers
Because of the testing done by u-blox (with 100% coverage), an OEM manufacturer does not need to repeat
the firmware tests or measurements of the module RF performance or tests over analog and digital
interfaces in their production test.
However, an OEM manufacturer should focus on:
Module assembly on the device; it should be verified that:
o The soldering and handling process did not damage 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 device are working
o Overall RF performance test of the device including the antenna
Dedicated tests can be implemented to check the device. For example, the measurement of the module
current consumption 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 the digital interfaces
(communication with the host controller, check the SIM interface, GPIOs, etc.) or to perform RF performance
tests (see the following section 5.2.2 for details).
5.2.1 “Go/No go” tests for integrated devices
A “Go/No go” test is typically used to compare the signal quality with a “Golden Device” in a location
with excellent network coverage and known signal quality. This test should be performed after the data
connection has been established. AT+CSQ is the typical AT command used to check signal quality in term
of RSSI. See the SARA-R4/N4 series AT Commands 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 communications with the host controller, the SIM card and
the power supply. It is also a means to verify if components at the antenna interface are well-soldered.