ZOE-M8 series - Hardware Integration Manual
UBX-16030136 - R07 Production Information Product testing
Page 26 of 32
4 Product testing
4.1 Test parameters for the OEM manufacturer
Because of the testing done by u-blox, it is obvious that an OEM manufacturer doesn’t need to repeat firmware
tests or measurements of the GNSS parameters/characteristics (e.g. TTFF) in their production test.
An OEM manufacturer should focus on:
• Overall sensitivity of the device (including antenna, if applicable)
• Communication to a host controller
4.2 System sensitivity test
The best way to test the sensitivity of a GNSS device
is with the use of a Multi-GNSS generator. It assures
reliable and constant signals at every measurement.
u-blox recommends the following Multi-GNSS
generator:
• Spirent GSS6300
Spirent Communications Positioning Technology
www.positioningtechnology.co.uk
4.2.1 Guidelines for sensitivity tests
1. Connect a Multi-GNSS generator to the OEM product.
2. Choose the power level in a way that the “Golden Device” would report a C/No ratio of 38-40 dBHz.
3. Power up the DUT (Device Under Test) and allow enough time for the acquisition.
4. Read the C/N0 value from the NMEA GSV or the UBX-NAV-SVINFO message (e.g. with u-center).
5. Compare the results to a “Golden Device” or the u-blox EVK-M8GZOE Evaluation Kit.
4.2.2 ‘Go/No go’ tests for integrated devices
The best test is to bring the device to an outdoor position with excellent sky view (HDOP < 3.0). Let the receiver
acquire satellites and compare the signal strength with a “Golden Device”.
As the electro-magnetic field of a redistribution antenna is not homogenous, indoor tests are in most cases
not reliable. These kind of tests may be useful as a ‘go/no go’ test but not for sensitivity measurements.
20: Multi-GNSS generator
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