H3BH
H3BH
299
Precautions
Caution
Donotchangethetime unit,oroperationmodewhiletheTimer
is inoperation. Otherwise, theTimermaymalfunction or suffer
from damage.Be sureto turnoff thepower supply of theTimer
before changing the time unit, rated time or operation mode.
How to Change Rated Time
Dial digits (0 to 0.5, 0 to 1.0, 0 to 5, or 0 to 10) appear in the six win-
dows around the time setting knob according to the rated time se-
lected by turning the rated time selector (i.e., rotary switch) located
at the lower-left corner of the front panel.
Switch Setting
The selector switches for time unit, scale, and function can be
turnedinbothdirections,clockwiseandcounterclockwise. Eachse-
lectorswitchhas asnap mechanismthat securestheswitchat agiv-
enposition. Setthe switchat a position atwhichit is secured. Donot
set it midway between two securing positions because such prac-
ticemaycauses theTimertomalfunctionor, in theworst case,break
down.
Accurately move and set the scale selector switch, matching the 0
position mark to a division on the scale.
Wiring
Since the H3BHuses ahigh-impedance circuit,the inducedvoltage
may disable it from releasing. To prevent this, keep the wiring as
short as possible. Also, do not run the wiring in parallel to power
lines. Incasetheinduced voltage is morethan30% ofthe rated volt-
age, connect an RC filter (C = 0.1
&
F, R = 120
$
) or bleeder resistor
across the power terminals.Connect thebleederresistor alsowhen
the residual voltage is caused by a leakage current.
WARNING
Electrical Shock Hazard
Never touchthe input terminals ofany H3BH Timer while pow-
er is being applied to the Timer.
!
!
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