EVK-M10QSAM - User guide
5 Measuring current
5.1 Measuring GNSS current
At startup, the receiver starts in acquisition mode to search for available satellites and to download
GNSS orbital data, i.e., ephemeris and almanac. Once the data has been downloaded, the receiver
enters tracking mode. In continuous operation, the receiver typically remains in tracking mode once
entering it. The current consumption reduces when the receiver enters the tracking mode. The time
required to enter tracking mode can be reduced by downloading aiding data from the AssistNow
™
Online service.
On EVK-M10QSAM, the main supply voltage for the u-blox M10 GNSS receiver is 3.3 V. To measure
the total GNSS supply current with EVK-M10QSAM, follow these steps:
1.
Power up EVK-M10QSAM.
2.
Connect a true RMS voltmeter across P1A (pin 12) and P1B (pin 11) of the
.
3.
Read the voltage (and average if necessary) on the voltmeter and convert to current (1 mV
equals 1 mA).
4.
Perform the test with good signals and clear sky view to ensure that the receiver can acquire
the satellite signals.
For more details see the setup below.
Figure 4: Example – tracking current measurement
5.2 Measuring backup current
To measure the backup current (I
BCKP
) with EVK-M10QSAM, follow these steps:
1.
Connect a true RMS voltmeter across P2A (pin 10) and P2B (pin 9) of the
.
2.
Remove power supply (USB cable or other external power supply from the 14-pin connector).
3.
Read the voltage (and average if necessary) on the voltmeter and convert to current (1 mV
equals 10 µA).
UBX-22026860 - R01
5 Measuring current
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