EVK-R4 - User guide
UBX-16029216 - R07
Appendix
Page 27 of 31
C1-Public
D.2
EVK-R422M8S
The current consumption of the SARA-R422M8S modules can be measured on the EVK-R4 by
removing the jumper socket from the
Cellular VCC supply jumper
J109 available on the ADP-R4, as
illustrated in
Cellular VCC supply jumper socket (J109)
to be removed for SARA-R422M8S module
current consumption measurements
Figure 12: Jumper socket to be removed for SARA-R422M8S 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 digital multi-meter placed in series, as illustrated in
SARA-R4 adapter board
SARA-R4
Cellular
module
42
-p
in
D
IL
B
2B
c
onne
ct
or
s
EVB-WL3
Step - down
Main power switch
(SW400)
12 V
(J400)
3.8 V
VCC jumper
(J109)
VCC
Digital multimeter
DCI
+
–
VCC jumper
(J404)
Figure 13: Block diagram of current consumption setup for SARA-R422M8S modules
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
SARA-R4 adapter board
SARA-R4
Cellular
module
42
-pi
n
DI
L B
2B
c
on
nec
to
rs
EVB-WL3
Step - down
Main power switch
(SW400)
12 V
(J400)
3.8 V
VCC jumper
(J109)
VCC
Power analyzer
PSU
VCC jumper
(J404)
+
GND
GND
Figure 14: Block diagram of current consumption setup for SARA-R422M8S using a DC power analyzer
