Monarch Instrument Nova-Strobe PBL - Manual (Page 21)

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If a Remote Optical Sensor or Magnetic Sensor is used to sense one pulse per
revolution (External mode), the readout will display directly in RPM (FPM)
without any adjustment required.
In instances when you can shut down the device and install a piece of refl ective
tape, then an optical tachometer is easier to use for RPM measurement.
Stroboscopes must be used when you can’t shut down the device. The
human eye is not easily tricked into seeing a stopped image by a stroboscope
when the fl ash rate is slower than 300 FPM. Therefore, stroboscopes are just
about impossible to use below 300 FPM for inspection or to measure RPM.
5.0 BATTERIES
The Nova-Strobe LED is fi tted with rechargeable NiMH (Nickel Metal
Hydride) batteries. These batteries contain fewer toxic metals than NiCd
(Nickel Cadmium) and are currently classifi ed “environmentally friendly”.
They also have 30% more capacity than NiCd batteries of the same size.
Like NiCds, NiMH batteries are prone to self-discharge - 10 to 15% of
charge is lost in the fi rst 24 hours then continues at a rate of 0.5 to 1% per
day. For maximum performance, charge the batteries just prior to use.
When not in use, the batteries should be charged at least every three months,
otherwise the battery capacity will be reduced or the batteries may become
unusable.
Charge the batteries before use and allow 3-5 cycles of charging and
discharging for batteries to reach full capacity.
The enclosure contains control electronics to properly and safely charge
the batteries. Never remove the batteries from the enclosure and attempt to
charge externally. Always use the recharger supplied (PSC-2U for the
DBL and PSC-PBXU for the PBL).