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8 POWER SUPPLY
8.1 Rechargeable batteries
The
CL526
portable calibrator is powered by four built-in rechargeable batteries. The instrument is shipped with an
average level of charge. After unpacking, a full charge of the batteries is recommended; connect the instrument to the
charger module (“OFF” condition) for a period of 10 hours minimum.
The Ni-MH rechargeable batteries do not suffer when used in cyclic operations.
Cyclic operation is understood as a method of operation by which the battery is continually charged and discharged.
Note that a battery, at its lower limit of discharge, risks a non uniform cell polarization: this condition makes it difficult to
recharge with the charger supplied.
Avoid leaving the instrument, with batteries totally or partially discharged, for a long time without recharging.
To charge the batteries use only the original supplied charging module. The module incorporates protection and current
limiting devices not normally found in other commercial chargers.
• When the
CL526
is connected to the battery charger module, by pressing keys <
SHIFT
> + <
BATTERY
> the
following indication will be displayed:
B
a
tt
ery:
Li
ne
O
p
If a numeric value appears, it indicates that the charger is probably faulty.
Replace the battery charger module; if the indication persists, contact
OMEGA
-Technical Assistance Dept.
WARNING:
AVOID
USING ALKALINE BATTERIES ON AN INSTRUMENT SET FOR
N
I
-MH
RECHARGEABLE BATTERIES
.
T
HIS IS EXTREMELY DANGEROUS AS IT COULD CAUSE THE ALKALINE BATTERIES TO EXPLODE
.
8.2 Battery Charger
The external battery charger is configured, before shipment, for a supply voltage of 110-120 Vac or 220- 240 Vac, upon
order specification. The nominal voltage value is indicated on the front label of the charger. Check for the correct input
voltage before connect it to the line.
8.3 How to maximize the battery life
Disconnect the ac mains supply when the battery is charged. Use the battery until it is completely discharged.
Leaving the ac mains supply plugged in will decrease the life of the battery.
Keeping the battery terminal clean will help maximize the operating time. Periodically wipe the positive and negative
terminals with a dry cloth.
Removing and replacing the batteries will ensure electrical contact. This should be done when using a battery that has
not been used for a long time.
Note that the operating time decreases at low temperatures.
A Ni-MH battery can be recharged about 500 times when used with the recommended instructions.
When replacing the Ni-MH batteries with a new set always replace simultaneously the four pieces.