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5.6 Current consumption measurement
To measure the current consumption of LEXI-R520 modules, remove the jumper socket from the
cellular VCC supply jumper J108 on the ADP-LEXI-R520 board, as shown in
J403
DL401
SW400
J400
DL405
J500
DS501
DS500
J501
DL501
DL403
J103
J102
J406
Figure 6: Jumper socket to be removed for LEXI-R520 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-WL3 will
supply the cellular module, with the digital multi-meter placed in series as illustrated in
12 V
Main power switch
Step - down
(J400)
(SW400)
EVB-WL3
Figure 7: Setup for cellular module's current consumption measurement using a current meter
Alternatively, a suitable external DC power supply with 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
Step - down
(J400)
(SW400)
EVB-WL3
Figure 8: Setup for cellular module's current consumption measurement using a DC power analyzer
UBXDOC-686885345-1791 - R02
C1-Public
J402
J300
J404
DL400
J103
(J102 on bottom side)
J106
J105
DS100
J107
J104
(J101 on bottom side)
J405
Digital multimeter
DCI
+
3.8 V
VCC jumper
VCC jumper
(J404)
(J108)
Power analyzer
PSU
GND
GND
3.8 V
VCC jumper
VCC jumper
(J404)
(J108)
EVK-LEXI-R520 hardware
This pin is connected to LEXI-R520 module VCC input pins
Remove cellular VCC supply jumper socket (J108)
–
VCC_MOD
LEXI-R520
module
ADP-LEXI-R520
+
VCC_MOD
LEXI-R520
module
ADP-LEXI-R520
EVK-LEXI-R520 - User guide
Figure
6.
Figure
Figure
Page 19 of 23
7.
8.
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