Ublox ADP-R8001, User Manual

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EVK-R8 - User guide
UBX-22018774 - R01 Appendix Page 18 of 20
C1-Public
C Current consumption measurement
The current consumption of the LENA-R8 module cellular system can be measured by removing the
jumper socket from the
Cellular VCC supply jumper (J102 on the ADP-R8, see Figure 6 ).
Cellular VCC supply jumper socket (J102)
to be removed for
LENA-R8 cellular system
current consumption measurements
Figure 6: Jumper socket to be removed for cellular 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 will supply
the cellular module, with the digital multi-meter placed in series as illustrated in
Figure 7 .
LENA-R8 adapter board
LENA-R8
module
42
-pi
n
DI
L
B
2
B
c
on
n
ec
to
rs
EVB-WL3
Step - down
Main power switch
(SW400)
12 V
(J400)
3.8 V
VCC jumper
(J102)
VCC
Digital multimeter
DCI
+ –
VCC jumper
(J404)
Figure 7: Block diagram of the setup for cellular module’ s current consumption measurement using a current meter
Alternatively, a suitable external DC power supply with the 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
Figure 8 .
LENA-R8 adapter board
LENA-R8
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
(J102)
VCC
Power analyzer
PSU
VCC jumper
(J404)
+ GND
GND
Figure 8: Block diagram of the setup for cellular module’s current consumption measurement using a DC power analyzer