8 Electronic Balancing Tool EBT720/EBT721 and ProHood PH720/PH721
4. Remove the old batteries and replace with fresh batteries (alkaline or rechargeable NiMH). Make
certain batteries are correctly oriented.
5. Verify the battery selection switch is correctly set (see Figure 5).
6. Reinstall the battery holder and replace the compartment cover.
Note: Make sure the battery holder is oriented so that its terminals make contact with the spring
contacts in the battery compartment.
If fresh, new alkaline batteries are used, the battery indicator will show 4 bars when first turned on.
With NiMH batteries, the indicator may show a lower value even when they are fully charged.
Notes: The percent power remaining will not be accurate for NiMH batteries because their voltage
does not decrease linearly with power use.
Due to the danger of battery leakage, remove batteries from the battery compartment before
storage. Never mix battery types.
The NiMH batteries should only be charged at room temperature. Starting with batteries that
are too cold or too warm can cause the charge cycle to stop early.
Connecting the Pitot Tube to the Micromanometer
The static pressure port (-) on the pitot tube will be connected to the negative pressure (-) port on the
micromanometer, and the total pressure port (+) on the pitot tube will be connected to the positive (+) port
on the micromanometer (see Figure 6).
Figure 6: Pitot Tube
Connecting the Static Pressure Port to the Micromanometer
The static pressure port on the static pressure probe will be connected to the (+) port on the
micromanometer. The (-) port on the micromanometer will be open to atmosphere (see Figure 7).
Total Pressure Port (+)
Static Pressure Port (–)
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