u-blox EVK-8, Руководство пользователя

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EVK-7 / EVK-8 / EVK-M8 User Guide
UBX-14002502 - R10 Early Production Information Measuring tracking current
Page 13 of 25
5 Measuring tracking current
To measure the tracking current with EVK-7 / EVK-8 / EVK-M8, follow these steps:
1. Connect a true RMS voltmeter across P1A (VCC) and P1B of the front connector. (see Figure 5)
2. Wait 12 minutes to download all GNSS orbital data, or download all the Aiding Data via the
AssistNow Online service
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.
☞
The overall current measurement also includes the internal SQI flash. For ROM based products
the current will be lower.
For more details see the circuit in Figure 9.
Hirschmann
Part Nr.: 934160100
P1A
(VCC)
P1B P1B
P1A
(VCC)
Figure 5: Example – tracking current measurement