ATP-3-09-02 Field Artillery Survey Download
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Survey Computer Systems 16 February 2016 ATP 3-09.02 6-5 Screen Brightness and Contrast. Brightness controls adjust a backlight outlining the display screen. Contrast controls adjust the color and intensity of the text and background. ELECTRICAL SPECIFICATIONS 6-12. The electrical specifications of the HTU are: The internal lithium battery (BA 5600/U) is inserted into the battery compartment. It powers the HTU during dismounted operations. The power stick can be used in place of the lithium battery. The power stick converts 12V or 24-32V DC power from a vehicular battery to the 9-12V DC power used by the HTU. The external AC or DC power can also be supplied using cables that connect to the J2 port on the HTU. When the J2 port is used, special types of adapters and cables are required. AC power from an electrical outlet can be 110/220V AC. DC power from a vehicular battery can be 12V DC or 24-32V DC. HANDHELD TERMINAL UNIT POWER MANAGEMENT 6-13. Power management is a new feature when the FOS software is running on the HTU. The purpose of power management is to extend the life of the lithium battery. 6-14. Power management will cause the HTU to “sleep” after 4 minutes of inactivity. Inactivity is defined as no messages received by the HTU and no keys pressed by the operator. 6-15. The HTU will “wake” when the operator presses a key or a message is received. To wake the HTU, the first key press must be firm and held down for about one second. As a suggestion, wake the HTU by pressing the Enter or W (for wake) key. However, most of the keys will wake the HTU. After the HTU wakes up, the next key press will perform the function of the key pressed. 6-16. Maximum power management will give 18 to 20 hours of operation before the battery dies. It will be enabled automatically by the FOS software. The indicators are— The green POWER light will slowly blink on and off. The screen will go blank. The screen brightness light (if on) will go off, and most internal components (such as the internal hard drive and CPU) will shut down. 6-17. Minimum power management will give 10 to 12 hours of operation before the battery dies. It is manually enabled by you. The minimum power management replaces maximum power management when an entry of 1 to 999 minutes is made in the LOOP TEST field in the SETUP display. 6-18. The HTU does not go into maximum power management because you have instructed the HTU to automatically send a test message to confirm communications are still established between your FOS and other FOSs. Therefore, the internal components of the HTU never shut down. 6-19. To conserve the battery, the LOOP TEST should be disabled (enter 0). You can set the LOOP TEST to 999 if you are not powering the HTU with the internal battery and do not have a need for the HTU to go to sleep. This will prevent the screen from going blank. The indicators are— The display backlight (if on) will go off, but the green POWER light will not blink and the screen will not go blank. The CPU and hard drive will slow down.