Quick start manual

STER PMU Quick Start Manual Instrument maintenance
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5 Instrument maintenance
5.1 CHANGING BATTERIES
STER PMU uses six rechargeable NiMh batteries, type HR 6 (size AA) for battery backup. Make sure that the power
supply adapter/charger and measurement leads are disconnected and the instrument is switched off before
opening the device.
Turn the device upside down as shown on the picture below to keep the batteries from falling out after the lid is
opened. Using a coin or a screwdriver, unscrew the battery lid and remove it.
Figure 5.1: Removing the battery holder
Remove old batteries and insert new ones as shown in figure below:
Figure 5.2: Battery placement
Warning! Always double-check that the polarities are correct before placing the battery holder lid to avoid
damaging the equipment.
When batteries are in place, tilt the instrument as shown in the first picture, and screw the lid back on.
5.2 SAFETY CONSIDERATIONS
Hazardous voltages exist inside the instrument. Always turn off the instrument, disconnect all test leads
and remove the power supply cable before removing battery compartment cover.
 If the instrument is not going to be used for long periods of time, it is advisable to remove all batteries from
the battery holder after powering it off.
 Always turn off the instrument before opening the battery compartment cover.
 Use only the original power supply adapter/charger to avoid possible fire or electric shock.
 Rechargeable NiMh batteries type HR 6 (size AA) are recommended. The charging time and the operating
hours are given for batteries with a nominal capacity of 2500 mAh.
 Never use standard batteries while power supply adapter/charger is connected to prevent explosion!
 Do not mix batteries of different types, brands, ages, or charge levels.
 When charging batteries for the first time, make sure to charge batteries for at least 24 hours before switching
on the instrument.