http://cfa-www.harvard.edu/space_geodesy/BARGEN/publications/rx_mem.pdf
The MorningStar is a high frequency pulse width modulation type regulator. Therefore,
When the batteries are fully charged, the regulator diverts power directly to the system
Buss which supplies power to the receiver. This type of regulation creates high frequency
AC noise on the DC power supply. This causes the sensitive comparator circuits in some
Trimble receivers to falsely trigger a low battery detect. Without the Low Battery
Override option, older Trimble receivers (I.e. Some SSE models) stop logging data when
A low battery detect occurs. The CLEAR key on the receiver needs to be physically
Pressed for the receiver to resume logging data. The CSMS was designed to automatically
Clear a low battery detect. Unfortunately, this function never operated properly. However,
Trimble now offers a Low Battery Override option that allows the receiver to continue
Logging data when a low battery detect is triggered.
Even though the Low Battery Override allows a Trimble receiver to continue logging data
When a low battery detect is triggered, it is best to have as clean a DC supply as possible.
A dirty DC supply (AC noise) can cause many unforeseen problems that range from
Power problems to communication problems.
Curt measured AC noise ripple as high as 2V (RMS) at four B&R stations.
Replace the MorningStar regulator with a FlexCharge regulator. The FlexCharge is a low
Frequency pulse regulator. This regulator has a charge divert that dissipates the high
Frequency AC noise through a load to ground - The load would be a power resister. This
Would relieve the problem of the AC noise on the DC power supply. In return, this would
Relieve the problem of the Trimble receivers comparator circuit detecting a low battery.
