C Current Consumption Measurement - Ublox EVK-R8 Series User Manual

C Current consumption measurement

The current consumption of the LENA-R8 module cellular system can be measured by removing the
jumper socket from the Cellular VCC supply jumper (J102 on the ADP-R8, see
Figure 6: Jumper socket to be removed for cellular module's current consumption measurement
A suitable external digital multi-meter (as the Keysight 34465A, 34410A or 34411A) can be used for
current consumption measurements: in this example, the 3.8 V supply circuit on the EVB will supply
the cellular module, with the digital multi-meter placed in series as illustrated in
12 V Main power switch
(J400) (SW400)
EVB-WL3
Figure 7: Block diagram of the setup for cellular module's current consumption measurement using a current meter
Alternatively, a suitable external DC power supply with the dynamic current measurement capabilities
(e,g., the portable and cheap Qoitech Otii Arc, or the more accurate Keysight N6705B, or the models
designed for mobile communications Keysight 66319B/D or 66321B/D) can be used, acting also as
3.8 V supply source for the cellular module mounted on the adapter board, as illustrated in
12 V
Main power switch
(J400) (SW400)
EVB-WL3
Figure 8: Block diagram of the setup for cellular module's current consumption measurement using a DC power analyzer
UBX-22018774 - R01
C1-Public
3.8 V
Step - down
VCC jumper
(J404)
3.8 V
Step - down
VCC jumper
(J404)
Cellular VCC supply jumper socket (J102)
to be removed for
LENA-R8 cellular system
current consumption measurements
Digital multimeter
DCI
+ –
VCC LENA-R8
module
VCC jumper
(J102)
LENA-R8 adapter board
Power analyzer
PSU
GND +
GND
VCC LENA-R8
module
VCC jumper
(J102)
LENA-R8 adapter board
Appendix
EVK-R8 - User guide
Figure 6).
Figure 7.
Figure 8.
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