CHAPTER 11 MAINTENANCE
11 Maintenance
11.1 Internal battery and its replacement
The internal battery is essentially 'maintenance free'. However,
even when the instrument is switched off, there is some discharge,
which is stimulated by elevated temperatures. If it is forseeable that
the instrument will not be used for some months, the battery should
be charged beforehand. Excessive discharge of the battery should be
avoided, as this may cause irreversible damage. Such damage
involves lowering of the capacity and increase of internal resistance,
with the consequence that recharging becomes necessary after
relatively short times of operation and that there is an excessive
lowering of voltage during a saturation pulse. In this case, battery
replacement is recommended.
The MINI-PAM features a number of functions and warnings
which make it highly unlikely that excessive discharge of the battery
occurs inadvertently:
• AUTO-OFF (when there was no key operation for 4 min)
• Backlight-off (50 s after switching the instrument on)
• Menu point 34: BATT (display of battery voltage in the resting
state as well as with application of a saturation pulse)
• Warning 'BAT' on the display, when battery voltage drops below
11.2 V in the resting state
• Error message 3: 'LOW BATTERY' when battery voltage drops
below 11.2 V (coupled to measurements involving START).
• Error message 6: 'CHECK BATTERY' when battery voltage
drops below 8.0 V during a saturation pulse.
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