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TABLE OF CONTENTS
TABLE OF CONTENTS
SPECIFICATIONS ................................................................ 1
OVERVIEW .......................................................................... 2
OPERATION ......................................................................... 2
USING THE HHT21A WITH A REMOTE OPTICAL SENSOR
(HHT20-ROS) ........................................................................ 3
CALIBRATION AND SELF-TEST .......................................... 3
BATTERIES .......................................................................... 5
CLEANING ........................................................................... 5
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 HHT21A 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.
5
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