Ublox EVK-L2 Series, User Manual

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EVK-L2 - User guide
UBX-14000422 - R11 Appendix Page 23 of 27
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F Current consumption measurement
Current consumption of TOBY-L2 series module can be measured on the EVK-L2 by removing 0R
jumpers
R118 and R115 mounted on the cellular adapter board, described in Figure 5 .
0R jumpers R118 and R115
to be removed
to measure the current consumption
of the TOBY-L2 module
Figure 5: 0R jumpers to be removed for TOBY-L2 modules current consumption measurement
A suitable external digital multi-meter (as for example 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 TOBY-L2 module, with the digital multi-meter placed in series as described in
Figure 6 .
TOBY-L2 adapter board
TOBY-L2
Cellular
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
Digital Multimeter
DCI
+ –
VCC jumper
(J404)
R118
R115
jumpers
Figure 6: Block diagram of current consumption setup for TOBY-L2 modules using a multimeter
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 TOBY-L2 module
mounted on the adapter board, as illustrated in
Figure 7 .
Power analyzer
PSU
+ GND
TOBY-L2 adapter board
TOBY-L2
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
VCC jumper
(J404)
R118
R115
jumpers
GND
Figure 7: Block diagram of current consumption setup for TOBY-L2 modules using a DC power analyzer