ETS-Lindgren HI-3637 VLF Magnetic Field Meter - Manual (Page 21)

HI n 3637 Manual Page — 13
4.0 BATTERY CHARGING
Introduction
Each HI n 3637 meter contains a rechargeable nickel-
cadmium (NiCd) battery. A fully-charged battery (nominal
output voltage of 12 VDC) provides up to 20 hours of
operation.
NOTE:
Holaday Industries, Inc., charges the internal
NiCd battery of the HI n 3637 at the factory in
order to calibrate the instrument prior to
shipment. While every effort is made to
ensure that your meter arrives ready to use,
we cannot guarantee that this will be the
case. Always check the condition of the
meter's battery prior to use.
Battery Tips
Nickel-Cadmium (NiCd) batteries have several
characteristics that can affect both their performance and
operating life. The following tips advise you how to take
advantage of these characteristics to get the most out of
your meter's battery.
! Although NiCd batteries are rated for operation in
temperatures from -20 °C to +65 °C (-4 °F to
+140 °F), using the meter in extreme temperatures
will reduce operating time significantly. The
optimum operating temperature range for these
batteries is +20 °C to +30 °C (+68 °F to +86
°F).
! The battery in the HI n 3637 does not require
periodic "deep discharges" to reverse the capacity-
depleting "memory effect" caused by repeated
shallow discharges; however, undercharging can
reduce battery capacity.
! If the battery appears unable to acquire or maintain
an appreciable charge, individual cells in the battery
may be shorted or damaged. If, for any reason, you
need assistance replacing your battery contact
Holaday Customer Service.