SARA-R4 series - System integration manual
UBX-16029218 - R20 Product testing Page 119 of 128
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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. The
Figure 70 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 70: Automatic test equipment for module tests
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