Instructions

UM-0085-B09 DT80 Range User Manual Page 295
RG
 Step 2 – Other Hardware
The following table specifies the typical additional power required by each of the DT80's "non-core" hardware modules:
Module
Powered during
sleep
Battery power (6V)
DT80/ 81/ 82I/ 85/ 85G
External power
(12/24V)
DT82E/ 80L/ 80GL/ 85L/
85GL External power
(12/24V)
Ethernet
No
300 mW
500 mW
400 mW
LCD Backlight No 450 mW 600 mW 350 mW
Analog Subsystem (see note
below)
No 650 mW 1000 mW 650 mW
12V Power Output
No (Yes if
P28=2
)
400 mW
550 mW
350 mW
CEM20 active
No (Yes if P28=2)
350 mW 350 mW 350 mW
12V Load (max 150 mA)
No (Yes if
P28=2
)
up to 1800 mW
up to 1800 mW
up to 1800 mW
PWR OUT Load (max 300 mA)
Yes
-
up to 3600 mW
up to 3600 mW
Battery charge current
(max 600 mA)
Yes - up to 3600 mW -
DT8xM3 modem idle No - -
1600 mW (3G)
1200 mW (GSM)
DT8xM3 modem sending No - -
2500 mW (3G)
1900 mW (GSM)
DT8xM2 modem idle
No
-
-
400 mW (GSM)
DT8xM2 modem sending No - - 726 mW (GSM)
WiFi interface idle
No
-
-
400 mW
WiFi interface active No - - 750 mW
Table 16: Power consumption for DT80 hardware modules
Note that:
• The Ethernet interface is enabled by default, and will consume close to the indicated power even if there is no
Ethernet cable connected. To save this power it is necessary to explicitly disable the port using
PROFILE
ETHERNET ENABLE=NO
or PROFILE ETHERNET IP_ADDRESS=0.0.0.0.
• The LCD module itself consumes negligible power, but the backlight's power usage is significant. By default, the
backlight will switch off 30 seconds after the last key press.
• The Analog Subsystem figures represent the power used while performing an analog measurement. This power
does not
need to be added when calculating average power consumption, as it has already been incorporated
into the Core Hardware calculation. It is included here to assist in calculating the peak
power demand.
• The figure quoted for the 12V Power Output is the "no load" consumption which will be present whenever the
power output is enabled (PWR12V=1, or during a CEM20 measurement). The additional power drawn by an
external device connected to the 12V output is shown separately.
• The quoted CEM20 power consumption is for when it is actively in use i.e. its relays are enabled. Only one
CEM20 will be active at any one time. CEM20s which are powered but idle draw minimal power (10mW).
• The battery charge current will be close to zero once the battery is fully charged; for a flat battery it will be up to
600 mA (3600 mW).
• For integrated modem models, the modem draws zero power when it is not in use. The "idle" power is
applicable during the network registration process (typically 60s) and while the modem is online but not actively
sending data.
• For integrated modem models, the indicated power values are average values. Peak power usage can be up to
3500mW for the DT8xM3 and 1700mW for the DT8xM2.
For hardware modules which are powered during sleep mode (e.g. PWR OUT output), their power consumption can be
simply added to the core hardware average power consumption calculated above.
For modules which are not powered during sleep mode (e.g. 12V output) it is necessary to scale their power usage
according to the percentage of time that the logger spends awake, which can be estimated from the following table:
Scan rate
0 analog channels
5 analog channels
30 analog channels
300 analog channels
2 sec and below
100%
100%
100%
100%
3 sec
24%
34%
100%
100%
5 sec 15% 20% 38% 100%
10 sec
7%
10%
19%
100%
1 min 1.2% 1.7% 3.2% 19%
10 min
0.1%
0.2%
0.3%
1.9%
1 hour
0.02%
0.03%
0.05%
0.3%
10 hour and above 0% 0% 0% 0.03%
Table 17: Approx. percentage of time spent awake