Campbell Scientific RF400/RF410/RF415 Spread Spectrum Radio/Modem User Manual
Page 84
Appendix L. RF400/RF410 Average Current Drain Calculations
L-6
EXAMPLE #4 (Remote RF400/RF410 in “<0.4 mA, 8 sec Delay” standby mode)
The RF400/RF410s in this example are configured for the lowest possible
average standby mode current (Advanced Setup Menu selection 7). The same
amount and frequency of data are collected as in Example 1.
It = Is + Id + Ir + Ii
Calculating each term:
Is = table mA value = 0.4 mA
It
≈ 2.4 mA
In this example the dominant average current drain contributor becomes the
“time of inactivity to sleep” current.
mA
0.08
mA
73
ms
60,000
ms
65
mA
73
(ms)
T
(ms)]
N
2
(ms)
45
[
Id
=
Ч
=
Ч
+
=
mA
0.008
mA
24
(ms)
60,000
(ms)
20
Ir
=
×
=
mA
2
mA
24
(ms)
60,000
ms
5000
Ii
=
Ч
=