ThingMagic Nomad RFID Design Guide - Manual (Page 4)

Nomad
RFID
Reader
Design
Guide
Page
4
The average power consumption can be reduced significantly if the RFID reader is activated
periodically rather than continuously. For example, if the reader is configured to search for tags
for only 5 seconds every 3 minutes, the average additional power consumption due to RFID
services drops from 2.7 W to 0.1 W.
Taking these power consumption figures into account, the table below shows the total expected
power consumption based on the services that are active, and gives the anticipated battery life if
the Nomad were run continuously in the indicated state.
Services Active Combined Average
Power Consumption Battery
Life
All wireless off, backlight off, processor idling, room
temperature = Reference A
1.1 W 17.1 hours
GPS continuously tracking = References (A+B) 1.3 W 14.4 hours
GPS not tracking, keyboard wedge enabled and
scanning for tags = References (A+D)
4.1 W 4.3 hours
GPS not tracking , keyboard wedge enabled but not
continuously scanning for = References (A+C)
1.5 W 12 hours
Using the power consumption figures provided above, the user can calculate the average power
consumption and anticipated battery life based on the proportion of time the reader spends in
each state.