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Humidity: Maximum relative humidity 80% for temperature
up to 88 °F [31 °C] decreasing linearly to 50%
relative humidity at 104 °F [40 °C]
Dimensions (LxWxH):6.13” x 3.25” x 1.75 “ plus 4.75” handle
[155.7 mm x 82.6 mm x 44.5 mm x 120.7 mm]
Weight: 1.25 lbs [0.57 kg]
OVERVIEW
Each Phasar-Tach model combines the accuracy and safety of a non-contact
optical tachometer with the convenience and ease of operation of a pistol
grip instrument. The instrument provides non-contact measurement of
rotational speed to an accuracy of .01% of reading. It reads RPM directly to
the nearest RPM, and a ‘on-target’ indicator is provided to verify the
instrument is properly aligned on a target and receiving valid information.
OPERATION
The Tachometer measures rotational speed from a single pulse per revolution.
This pulse is supplied by marking the rotating shaft with reflective tape in
an easily accessible location. The Tachometer is equipped with a built-in
incandescent or laser light source providing a beam which is aimed at the
reflective tape located on the rotating shaft. The pulse from the reflective
tape is received back through a single lens reflex optical system and detected
by a photocell inside the instrument. The Tachometer then computes the
rotational speed and displays it to a resolution of 1 RPM.
To operate the Phasar-Tach, simply aim it at the reflective tape while
holding it at a distance of 1 inch [25.4 mm] to 3 feet [0.9 m] for incandescent
lamp units or up to 15 feet [4.6 m] for laser units (observe laser safety
precautions). Squeeze the pistol grip trigger, and read the indicated speed.
The on-target indicator must be on. The display is updated twice per
second.
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BATTERIES
The Tachometer operates from four ‘AA’ size batteries which are located
under the hinged top of the instrument. To access these batteries, grip the
tapered cover at the optical lens end of the instrument and pull up. The
cover is hinged at the display end of the instrument and pivots fully out of
the way. It may also be convenient to keep a spare supply of reflective tape
in the free area underneath this cover.
The instrument will provide six to eight hours of continuous operation on a
single set of batteries, depending on the type used. The instrument is
provided with a built-in charging network, which works in conjunction with
the optional NiCad batteries. The optional recharger plugs into the single
jack located next to the optical lens at the front end of the instrument.
Fourteen to sixteen hours is required for a complete recharge. When the
battery voltage in the Phasar-Tach is getting low, the display will blink
“LO BAT” to indicate that the batteries need to be replaced.
NOTE: Only use model R-5B (115 Vac) or R-6B (230 Vac) rechargers
with NiCad batteries. Do not attempt to charge non-rechargeable
batteries.
ALWAYS DISPOSE OF BATTERIES IN A SAFE AND RESPONSIBLE
MANNER.
CLEANING
To clean the instrument, wipe with a damp cloth using mild soapy solution.
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