Ublox LENA-R8 Series, User Manual

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EVK-R8 - User guide
UBX-22018774 - R02 EVK-R8 HW Page 21 of 25
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5.6 Current consumption measurement
To measure the current consumption of the LENA-R8 module cellular system, remove the jumper
socket from the Cellular VCC supply jumper, (
J102 on the ADP-R8), as shown in Figure 7 .
Figure 7 : 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 8 .
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 8: 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 9 .
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 9: S etup for cellular module’s current consumption measurement using a DC power analyzer
J101
J100
J300
SW400
J400
NO
R
M
A
L
→
U
S
B
B
O
O
T
J500
J502
J501
J600
J700
J102
VBKP_GNSS_1V8
J702
J701
EVB_UART_N
GND
ADP_UART_N
J601
J402
(J401 on bottom side)
J403
(J400 on bottom side)
VCC_GNSS
J500
J501
OFF B2B DB9
UART0
D
E
T
A
CH
BATT
DISABLE
DL401
DL400
J404
VCC_MOD
VCC_GNSS_1V8
VCC_INT_MOD
DL403
DL501
D
L
4
0
4
LED700
LED600
DL405
DS501
DS500
D
S
1
0
7
D
S
1
0
5
D
S
1
0
9
D
S
1
0
3
GPIO ONBOARD MINIUSB
G
N
S
S
B
K
P
L
ED
7
0
1
J402 J403
J405 J406
J401 J407
VCC_GNSS
Remove cellular VCC supply
jumper socket ( J102 )
J103
D
S
1
1
8
D
S
1
2
1
D
S
1
0
7
D
S
1
0
4
J102