Integration Manual

SARA-R4/N4 series - System Integration Manual
UBX-16029218 - R13 Product testing Page 105 of 119
5 Product testing
5.1 u-blox in-series production test
u-blox focuses on high quality for its products. All units produced are fully tested automatically on the production line.
Stringent quality control processes have been implemented in the production line. Defective units are analyzed in detail
to improve production quality.
This is achieved with automatic test equipment (ATE) in the production line, which logs all production and measurement
data. A detailed test report for each unit can be generated from the system. Figure 57 illustrates the typical automatic
test equipment (ATE) in a production line.
The following typical tests are among the production tests.
• Digital self-test (firmware download, flash firmware verification, IMEI programming)
• Measurement of voltages and currents
• Adjustment of ADC measurement interfaces
• Functional tests (serial interface communication, SIM card communication)
• Digital tests (GPIOs and other interfaces)
• Measurement and calibration of RF characteristics in all supported bands (such as receiver S/N verification, frequency
tuning of the reference clock, calibration of transmitter and receiver power levels, etc.)
• Verification of the RF characteristics after calibration (i.e. modulation accuracy, power levels, spectrum, etc. are
checked to ensure they are all within tolerances when calibration parameters are applied)
Figure 57: Automatic test equipment for module tests