SARA-R4/N4 series - System Integration Manual
UBX-16029218 - R11 Product testing Page 138 of 157
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
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