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Digital AVC Instruction Manual
Battery Installation/Replacement
The HPM 4/5/6 is shipped with a 9-volt alkaline PP3 battery (IEC # 6LR61, ANSI # 1604A). The battery
compartment is on the back of the instrument inside the rubber boot.
1. See 2.2.1 to remove the instrument from the boot and disconnect the cable.
2. Locate the battery compartment on the bottom rear of the case.
3. Open the battery compartment by pressing in and sliding the compartment cover down
4. Disconnect the old battery (if present)
5. Plug in a new 9-volt battery and place battery and wires into the compartment.
6. Reinstall the battery compartment cover by pressing down on the battery with the cover and sliding
the cover until it snaps into position
7. See 2.2.2 to put the cable back on and re-insert into the boot
2.3.1.
Battery Life Notes
Battery life specifications are given at 20°C. If the HPM 4/5/6 is operated for a significant time at
temperatures much lower than this, battery life will be reduced. Alkaline batteries have an operating
temperature range of -18°C − 55°C (0°F − 130°F). Lithium (not lithium ion) 9-volt batteries (ANSI # 1604L)
are the recommended replacement when operating in cold or very warm temperatures. The operating
temperature for Lithium batteries is -20°C − 60°C (-4°F − 140°F). Lithium batteries have better cold-weather
behavior and longer battery life than alkali batteries at all temperatures.
EAR99 Technology Subject to Restrictions Contained on the Cover Page
Page 10 of 17
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