TeraOhm 5kV
31
7. Maintenance
7.1. Inspection
To maintain the operator’s safety and to ensure the reliability of the instrument it is
advisable to inspect the instrument on a regular basis. Check that the instrument and its
accessories are not damaged. If any defect is found please consult your service center,
distributor or manufacturer.
7.2. Battery Replacement
The instrument is designed to be powered by rechargeable battery supported with mains
supply. The LCD contains an indication of low battery condition. When the low-battery
indication appears the battery has to be replaced or recharged, connect the instrument
to the mains power supply for 14 hours to recharge cells battery (2200 m A h). Typical
charging currents is 150 m A.
Note:
•
Operator does not need to disconnect the instrument from mains supply after the full
recharging period. The instrument can be connected permanently.
Battery cells are stored in the bottom section of the instrument casing under the battery
cover. In case of defective battery please note the following:
♦
All six cells have to be replaced and they have to be of the same type.
♦
Turn the power off and disconnect any measurement accessory connected to
the instrument before opening the battery cover to avoid electric shock.
♦
Do not operate the instrument by mains supply without rechargeable batteries
in order to avoid permanent damage of internal circuitry.
Nominal power supply voltage is 7.2 V DC. Use six NiCd or NiMH cells with size
equivalent to IEC LR14 (dimensions: diameter = 26 mm, height = 50 mm). See the next
figure for correct polarity of batteries.
Fully charged rechargeable battery can supply the instrument for approx. 20 hours.
Note:
•
Standard IEC LR14 type alkaline cells can also be used to replace rechargeable
battery.
Avoid connection to mains supply when alkaline batteries are inserted,
danger of explosion.
High quality alkaline batteries can supply the instrument for
approx. 60 hours.
