Instruction Manual

Appendix L. RF401/RF411 Average Current Drain Calculations
EXAMPLE #2 (Base RF401/RF411 in default standby mode)
The base RF401/RF411 in the above example does more receiving and less
transmitting than the remote RF401/RF411 so you might expect less average
current drain, however, the amount of data being transmitted per minute is
small, and the long header required is significant. Here are the results:
It = Is + Ih + Iq + Ir + Ii
Calculating each term:
Is = table mA value = 4 mA
It ≈ 6.9 mA
As in Example #1, the standby mode current, long header, and the “time of
inactivity to sleep” currents dominate the average RF401/RF411 current drains,
so the calculated values for remote and base RF401/RF411s are nearly equal.
Larger data collections would make the Ir contribution more significant.
ms)
700
length
header"
long
"
(default mA
0.875 mA 73
ms 60,000
ms 700
73
(ms)
T
(ms) L
Ih =
=×=×=
mA
mA 0.025 mA 73
(ms) 60,000
(ms) 20
Iq =×=
mA 0.026 mA 24
(ms) 60,000
ms] 20 (ms) 45[
Ir =×
+
=
50) sleep" toinactivity of time"default (using mA 2 mA 24
(ms) 60,000
ms 5000
Ii ==×=
L-4