Users’ Manual
EDI-53 Series Digital Indicator
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4
OPERATION
4.1
Charging the battery
The EDI-53 indicator uses an internal rechargeable Sealed Maintenance Free (SMF) battery. This battery
does not need any maintenance other than maintaining its state of charge by charging it periodically as
described below.
Before using the EDI-53 indicator ensure that the battery is fully charged. A separate battery charger is
provided along with the indicator for charging the internal rechargeable battery. The battery charger is
provided with mains cord terminated in 2 pin mains plug for inserting into a 2 pin 230 V AC mains outlet.
The other cord has a 3-pin circular connector which is inserted in the 3-pin circular connector at the side
of the indicator housing. The battery charger does not have any additional power on/off switch. A red
lamp on the charger glows to indicate that the charger is powered ON.
A fully discharged battery requires 16 hours of charge. As soon as the battery attains full charge the
charging current automatically reduces to a safe value which is known as float charge.
A partially discharged battery requires proportionately less charging time. However, as it is difficult to
estimate the remaining battery capacity it is suggested that whenever charging the battery 16 hours
charging schedule should be followed.
Although the battery will not get damaged if the charger is left on even after the battery gets fully
charged, it is advised that charging should not be done for more than 16 hours at a time. If the internal
battery is kept on float charge for very long time (say for days) the battery life gets reduced.
Whether the indicator is heavily or sparingly used the internal battery will need replacement every 3 to 5
years. The battery life depends on a number of variables including number of charge and discharge
cycles, depth of discharge and operating temperature and is difficult to predict.
The red ‘low batt’ lamp on the display turns on if the battery capacity (charge) is reduced to less than
approximately 15 percent of its rated capacity. Recharge the battery at the first opportunity after the ‘low
batt’ lamp turns on.
CAUTION:
A fully discharged battery should be put on charging immediately. If the battery is kept in
discharged condition an irreversible reaction inside the battery takes place which can either
severely reduce the battery life or may even make the battery unusable.
4.2
Turning on the indicator
Once the battery is charged you are ready to turn on the indicator for taking measurements. On the lower
right-hand side of the keypad is a key marked ON/OFF. Press this key momentarily for turning on power
to the indicator. (You have to press this key momentarily again to turn off the indicator). The LCD display
should immediately show some message.
As soon as you turn on the power switch the display will flash the following messages in quick
succession
EDI-53 V:02.00
-- SELF TEST --
---- PASSED ----
Date: 14/05/2004
The number following the EDI-53 in the first line can be different from that shown above. The decimal
number following the V: is called the revision number. The number to the left of the decimal point (01) is
the major revision number, also called the version number. The number to the right-hand side of the
decimal point (00) is called the minor revision number. If you have any complaints about the indicator you
