u-blox SARA-N3 Series, Руководство пользователя

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EVK-N3 - User guide
UBX-19004195 - R06 Appendix Page 14 of 17
C1-Public
D Current consumption measurement
Current consumption of SARA-N3 series modules can be measured on the EVK-N3 evaluation kits by
removing the jumper socket from the
Cellular VCC supply jumper J155 available on the ADP-N3
board, as shown in Figure 5 .
Cellular VCC supply jumper socket (J155)
to be removed for SARA-N3 module
current consumption measurements
Figure 5: Jumper socket to be removed for SARA-N3 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 SARA-N3 module mounted on the adapter board, with the digital multi-meter
placed in series as described in
Figure 6 .
SARA-N3 adapter board
SARA-N3
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
(J155)
VCC
Digital multimeter
DCI
+ –
VCC jumper
(J404)
Figure 6: Block diagram of current consumption setup for SARA-N3 series modules using a digital multi-meter
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 SARA-N3 module mounted
on the adapter board, as illustrated in
Figure 7 .
SARA-N3 adapter board
SARA-N3
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
(J155)
VCC
Power analyzer
PSU
VCC jumper
(J404)
+ GND
GND
Figure 7: Block diagram of current consumption setup for SARA-N3 series modules using a DC power analyzer