1. On/Off Switch.
2. Power On LED. Glows red when the URSA-II is powered on.
3. Charge Mode switch.
Slow position: Internal NiMH batteries are recharged using a trickle current which will fully charge depleted batteries in about 14 hours and safely maintain them at full capacity indefinitely.
Fast Charge: Internal NiMH batteries are undergoing a fast charge. Batteries will be fully charged in about three to four hours. Unless a fast charge is required, this switch should be left in the Slow position to maximize NiMH battery life.
4. Fast Charge indicator LED. Glows green when Fast charge is in operation. This LED goes out when the fast charge is complete, indicating that the Charge Mode switch can be set back to the Slow position.
5. External Power indicator LED. Glows red when external power is connected, regardless of whether the URSA-II is powered on or off.
6. SHV connector. This provides the high voltage output only for INPUT2 (i.e., will not accept a coupled signal).
7. BNC connector. This provides the signal input only for INPUT2 (i.e., does not carry high voltage).
8. Series “C” connector. This provides high voltage and accepts coupled signal for INPUT1.
9. Mini DIN-7 connector. This provides ±12-volt power if needed for detector preamplifiers. Also provides + 5 volts as well as logical outputs coupled to ALARM0 and ALARM1 in the URSA-II MCA software.
10. DB9 connector. Communication port for connecting the URSA-II with a controlling device (e.g., computer).
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.
2. Fan. The fan runs anytime the URSA-II is connected to external power. It does not run (and is not needed) when running on batteries.
Battery Compartment
1. 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 in the URSA-II while connected to external power.