Valid from serial number T-code
713962- 403-414, 669-671, 716-718
Order number Date
218920-040 2005-06-01
© BT Europe AB Service Manual REFLEX RR B/E, RR B/E CC 38- 13
Battery charger – 8340
Service and maintenance
38.4.3 Calibrating the measurement value
The electronic components in BTM have a specific margin of error.
Instead of calibrating the error margins using a trimming resistance or
potentiometers, the computer in BTM stores trimming constants in the
parameter memory, EE-prom. These trimming constants are calculat
-
ed using trimming functions and are activated via the keyboard.
Calibration takes place by first measuring the values to be calibrated
with an accurate instrument. Using the calibration function you enter
the true values into the computer. The computer calculates a trimming
constant, which is stored in the parameter memory and used to com
-
pensate the entered values.
The trimming constants are stored in the same way as the parameters.
Calibration therefore gives the error message E.77 or E.60. When cali
-
bration is complete you use the copy-over function to copy the data to
the other memory.
Calibrating the current’s zero value and tempera-
tures, code 21
NOTE:
The battery must not be connected. The charger shall be cold.
• Ensure the charger and its components have the same temperature
as the ambient temperature.
• Measure the ambient temperature
• Press *21 * 2451 * temperature °C*.
Example: If the ambient temperature is 19°C,
press * 21 * 2451 * 19 *).
The current display is reset when calibrating. The temperature of the
transformer, choke and diodes is set to that of the ambient tempera
-
ture.
Calibrating the battery voltage’s measurement val-
ue, code 20
• Connect the charger to the battery.
• Measure the voltage across the charger’s terminals.
• Wait until the battery voltage has stabilised.
• Press * 20 * 2451 * voltage and the first decimal *.
Example: If the voltage is measured to 56.4 V.
Press * 20 * 2451 * 564 *).
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