u-blox EVK-R5, User Manual

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EVK-R5 - User guide
UBX-19042592 - R09 Appendix Page 20 of 24
C1-Public
D Current consumption measurement
The current consumption of SARA-R5 modules can be measured on the EVK-R5 by removing the
jumper socket from the
Cellular VCC supply jumper J109 on the ADP-R5 board, as shown in Figure 6 .
Cellular VCC supply jumper socket (J109)
to be removed for SARA-R5 module
current consumption measurements
Figure 6: Jumper socket to be removed for SARA-R5 series modules current consumption measurement
A suitable external digital multi-meter (as for example the Keysight/Agilent 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 cellular module mounted on the adapter board, with the digital multi-meter
placed in series as illustrated in
Figure 7 .
SARA-R5 adapter board
SARA-R5
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 7: Block diagram of current consumption setup for SARA-R5 series modules
Alternatively, a suitable external DC power supply with 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 supply source for the cellular module mounted on
the adapter board, as illustrated in
Figure 8 .
SARA-R5 adapter board
SARA-R5
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
Power analyzer
PSU
VCC jumper
(J404)
+ GND
GND
Figure 8: Block diagram of current consumption setup for SARA-R5 series modules using a DC power analyzer