ETS-Lindgren HI-3627, User Manual

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20 Operation ets-lindgren.com
Low Battery Indication
The HI-3627 Magnetic Field Meter includes a "Low Battery" indicator.
This is an LED mounted on the front panel (refer to figure 4.1). It is
normal for the LED indicator to briefly blink when turning the switch to
various ranges and when turning the instrument off.
If the "Low Battery" indicator remains on during operation, the battery
must be recharged. When the "Low Battery" LED lights, about 10
minutes of useful operation remains. This relatively short time is due to
the output voltage of a NiCad battery remaining relatively flat until the
battery is almost completely discharged, and then dropping very
rapidly.
Recharging
Recharge the battery with the standard trickle charger (P/N H-491063-
02). Recharging a fully discharged unit will take 15 hours to complete.
The standard charger provided with the HI-3627 is a trickle charger. It
works by charging the battery with relatively low current. The charger
can be left connected to the meter indefinitely without causing severe
damage, although some memory effects may result. NiCad "memory"
sometimes occurs when the battery is kept at full or nearly full charge
without intervening discharge cycles. The effect is to reduce the
apparent capacity of the battery and shows up as a short operating
time before recharging is required. This effect can be minimized by
occasionally operating the meter until the "Low Battery" LED indicates
recharging is necessary.
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