5
8. DIN connector. This provides plus and minus 12-volt power if needed for detector preamplifiers. Also
provides plus 5 volts as well as logical outputs coupled to ALARM0 and ALARM1 in the URSA-II MCA software.
9. S9- High Voltage C connector his provides high voltage and accepts coupled signal for INPUT1.
Back End Panel
1. External Power input. Accepts 12VDC at 1.25A. Input voltage should never exceed 15V, as damage to the
URSA-II could result.
Battery Compartment
2. Battery Type Selection switch.
Recharge position: Allows NiMH batteries to be charged.
Standard position: The battery charging circuitry is disabled so non-rechargeable alkaline batteries can be kept
inthe URSA-II while connected to external power.
Powering the URSA-II
AC Power Supply
A 110VAC or 220VAC to 12VDC power supply is provided with the URSA-II. If you need to replace this for some
reason, make sure the output is a regulated 12VDC capable of delivering at least 1.25A continuous current.
The center pin is positive. Under no circumstances allow greater than 15VDC (or any AC voltage) into this
connector or damage to the URSA-II will likely result.
Charging the Internal NiMH Batteries
The URSA-II uses six “AA” 1800 mAh nickel metal hydride (NiMH) batteries. These are charged at either a slow
or fast rate, determined batteries voltages.
The NiMH batteries should power the URSA-II for about four hours. Note however that this figure can change
dramatically based on the current draw of the detector, high voltage, other hardware settings, ambient
temperature, and age and condition of the batteries.
The expected useful lifetime of NiMH batteries under the best of circumstances is about one year.
Do not attempt to charge NiCad or Lithium Ion batteries in the URSA-II. Doing so will damage the instrument.
There is no problem with using the URSA-II while charging the batteries.
Using Alkaline Batteries
It is not a problem using non-rechargeable batteries in the URSA-II. Remove the four screws on the back panel
and replace the NiMH batteries, with AA alkaline batteries. However, you must be absolutely sure to switch
the Charge Switch to the Standard position to bypass the URSA-II’s internal charging circuitry. Failure to do this
may result in catastrophic damage to the URSA-II. Switch it back to the Recharge position when NiMH batteries
are reinstalled.
Alternate External Power
The URSA-II can also be powered from a number of other external sources away from AC power for extended
periods(i.e., longer than the internal NiMH batteries can support). All that is required is that a DC voltage
in the range of 12 to15 volts is provided to the unit. DC power from most motor vehicles can meet these
specifications, and the URSA-II can be powered directly by a motor vehicle cigarette lighter adapter.
