EVK-F10T - User guide
UBX-23008022 - R01
Measuring current
Page 13 of 23
C1- Public
5
Measuring current
5.1
Measuring GNSS current on the 14-pin connector
The receiver starts up in the acquisition mode to search for available satellites and to download GNSS
orbital data, i.e. ephemeris and almanac. After downloading the data, the receiver switches to the
tracking mode and typically stays in it during continuous operation, reducing the current
consumption.
On EVK-F10T, the main supply voltage for the u-blox NEO-F10T GNSS receiver is 3.3 V. To measure
the total GNSS supply current with EVK-F10T, follow these steps:
1.
Before starting the test, make sure you have good signals and clear sky view to
ensure that the receiver can acquire the satellite signals.
2.
Power up EVK-F10T.
3.
Connect a true RMS voltmeter across GNSS I1 (pin 12) and GNSS I2 (pin 11) of
the 14-pin connector. The reading should be in mV.
☞
Use a maximum 25 cm cable when using the 3.3 V digital interfaces with your application (e.g.
UART)
4.
Read the voltage (and average it if necessary) on the voltmeter and convert to
current (For every 1 mV across the resistor it equals 1 mA in current
consumption).
☞
The current shunt resistor is 1
Ω
1%.