14 Providing power
Installing Batteries
Models SE and DL
Providing power
You can power the instrument with internal batteries or from an external power
source. There are two optional sources which include a universal power supply
9V/.66A 2.1 mm and an auto DC jack cable 12V. (See Optional Parts, in Appendix
A for more details.)

Installing Batteries

The instrument requires four AA-sized batteries. Disp osable alkaline batteries
are satisfactory, but you may also use rechargeable Nickel Metal Hydride
(NiMH) batteries.
• Rechargeable batteries ~ The instrument does not contai n a recharging
circuit. Recharge batteries externally using the rech arging device
available from 3M or a compatible device available e lsewhere.
• Selecting batteries ~ Do not mix battery types or batteries with
significantly different charge levels.
NOTE: To avoid possible battery leakage, remove the batteries when the
meter is not in use for prolonged periods.
To install batteries
1. With the back of the instrument facing up, push th e release latch to pop
open the battery lid (Figure 2-1).
Figure 2-4: Installing batteries
2. Lift off the lid and set aside. Wedge out the four batteries.
3. Replace the batteries with fresh batteries, taking car e that you orient all
batteries with the positive ends toward the base, as s hown in the drawing.
4. Re-insert the lid by fitting its locator pins into slots in the base end of the
battery compartment. The lid should fit snugly when c orrectly inserted.