Manual – Neon 2000 Family NRT & NRM
Unidata Manual - Neon 2000 Family Remote Terminals and Modules Issue 4.0.docx
Page 18
6.0
NRT/NRM POWER REQUIREMENTS
6.1
Internal Power
The NRT/NRM Terminals can be powered by internal batteries and / or with an external
battery supply. The recommended batteries are SAFT Lithium batteries which are
specified in this manual. The Lithium batteries provide high inrush current required for
modern cellular hand phones.
The NRT/NRM Terrestrial has one Lithium Battery and the NRT/NRM Satellite has three
Lithium Batteries for the internal battery supply.
6.2
External Power
If required the NRT/NRM can be powered by an external supply of 6 to 16VDC @ 2A
(peak – while transmitting) and 25mA (receive) and 30uA standby. Unidata recommends
12AH 6V Gel Cell-type recharge storage batteries as a good external supply. External
instrumentation must be separately powered if more than 500uA is required. The
download schedule is the largest consumer of power.
The Continuous Drain Equivalent rating can be used to size the external power
requirements and duration of external power supplies. However, external power sources
should have an additional 100uA at 12V or 50uA at 6V continuous drain added, (due to
parasitic losses in the NRT/NRM circuitry).
The decision to use an external power supply should be based on the projected or known
frequency of battery changes, i.e. if a high download schedule is required and frequent
battery replacement is going to prove difficult or expensive, then an external power supply
is desirable.
6.3
Battery Life Table
Approximate
NRT/NRM
Terrestrial
Battery Life
Approximate
Download
Schedule
Approximate
Scan Rate
Approximate
Log Interval
Approximate
Continuous.
Drain Equiv
5 years
1 per day
5 secs
15 minutes
0.12 mA
4 years
4 times per
day
5 secs
15 minutes
0.21 mA
1 year
1 per hour
5 secs
15 minutes
0.53 mA
52 days
1 per 5
minutes
5 secs
1 minute
5.2 mA
10 days
1 per minute
5 secs
5 seconds
26 mA
