Appendix L. RF400/RF410 Average Current Drain Calculations
EXAMPLE #2 (Base RF400/RF410 in default standby mode)
The base RF400/RF410 in the above example does more receiving and less transmitting than the remote RF400/RF410 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
Ih = |
| L (ms) | ⋅ 73 mA = | 700 ms | ⋅ 73 mA = 0.875 mA (default "long header"length = 700 ms) | |||||
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| T (ms) |
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| 60,000 ms |
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Iq = |
| 20 (ms) | ⋅ 73 mA = 0.025 mA |
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| 60,000 (ms) |
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Ir = | [45 (ms) + 20 ms] | ⋅ 24 mA = 0.026 mA | ||||||||
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| 60,000 (ms) |
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Ii = |
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| 5000 ms |
| ⋅ 24 mA = 2 mA | (using default "time of inactivity to sleep"= 50) | ||||
| 60,000 (ms) | |||||||||
As in Example #1, the standby mode current, long header, and the “time of inactivity to sleep” currents dominate the average RF400/RF410 current drains, so the calculated values for remote and base RF400/RF410s are nearly equal. Larger data collections would make the Ir contribution more significant.