EVK-R4 - User guide

UBX-16029216 - R08

Appendix

Page 26 of 31

C1-Public

D Current consumption measurement

D.1 EVK-R410M and EVK-R412M

The current consumption of the SARA-R410M and SARA-R412M modules can be measured on the

EVK-R4 by removing the jumper socket from the Cellular VCC supply jumper J404 available on the

EVB-WL3 as illustrated in Figure 9.

Cellular VCC supply jumper socket (J404)

to be removed for SARA-R41xM module

current consumption measurements

Figure 9: Jumper socket to be removed for SARA-R410M / SARA-R412M modules 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 case, the 3.8 V supply circuit on the EVB will supply the

SARA-R4 module, with the multi-meter placed in series as illustrated in Figure 10.

SARA-R4 adapter board

SARA-R4

Cellular

module

EVB-WL3

Step - down

Main power switch

(SW400)

12 V

(J400)

3.8 V

VCC jumper

(J404)

VCC

Digital multimeter

DCI

+

–

Figure 10: Block diagram of current consumption setup for SARA-R410M / SARA-R412M modules using a multimeter

Alternatively, a suitable external DC power supply with the dynamic current measurement capabilities

(as for example, 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 for

current consumption measurements, acting also as the 3.8 V supply source for the SARA-R4 module

mounted on the adapter board, as illustrated in Figure 11.

SARA-R4 adapter board

SARA-R4

Cellular

module

EVB-WL3

Step - down

Main power switch

(SW400)

12 V

(J400)

3.8 V

VCC jumper

(J404)

VCC

Power analyzer

PSU

GND

GND

+

Figure 11: Block diagram of current consumption setup for SARA-R410M / SARA-R412M modules using a DC power analyzer