Operation; Battery-Test; Parameter Setting - Bosch BAT 121 Operating Instructions Manual

en 16 | BAT 121 | Operation
5.

Operation

The BAT 121 is supplied with power from the battery
to be tested and is protected against reversed polarity,
overvoltage and overheating.
i
When testing a battery the battery tester must be
connected to the battery terminals. The battery does
not need to be disconnected from the vehicle elec-
trical system during the battery test. The Battery-
Test analyses the battery on the basis of impedance
measurements made between the battery terminals
(Kelvin terminals). Each additional ohmic resistance
would otherwise be attributed to the battery and
would evaluate the battery as being poorer than is
actually the case.
The following is displayed on the tester display as
soon as the plus terminal (red) and the minus terminal
(black) are connected to the battery:
Main menü BAT 121

Battery-Test

Generator-Test
Voltmeter
Configuration
Last Test Result
i
The Back Key O returns you to the main menu.
i
The Battery-Test result can be printed out by pres-
sing the Print Key D. The printing rate depends on
the battery voltage.
!
Heat-sensitive paper is subject to ageing and the
print fades after a few months. Always make a copy
if a print-out is to be kept for longer periods.
i
To preserve the print for as long as possible, heat-
sensitive paper should not be exposed to direct sun-
light, considerable heat or plasticizers such as those
contained in plastic films. Tanning agents such as
those sometimes found in leather (wallets) may also
cause the print to fade. Never allow heat-sensitive
paper to come into contact with adhesives, greases
and solvents.
i
After the tester is switched off, the last setting for
each of the parameters remains saved until the tes-
ter is switched on again.
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5.1 Battery-Test
!
Please note Chapter 4 "What you should be aware of
and observe when testing a starter battery".
!
Switch off all consumers in the car before conduc-
ting the battery test and remove the ignition key.
5.1.1

Parameter setting

1. Start the battery test with E.
2. Enter the parameter.
i
An important precondition for the battery test is the
entry of the standard and the attendant cold-start
current. Correct input is essential to reliable test
results.
Cold Start Current:
Enter the Cold Start Current as indicated on the batte-
ry. Use the keys and to adjust the value for the current
to between 50 A and 1550 A.
Batt. Standard:
Enter the Batt. Standard indicated on the battery. Use
the keys  and  to select from the 5 different stan-
dards for batteries:
R
DIN (50 A to 900 A)
R
IEC (50 A to 1000 A)
R
SAE (85 A to 1550 A)
R
EN (80 A to 1500 A)
R
JIS (Japanese Industry Standard)
Battery temperature:
Use the keys  and  to set the battery temperature
less than 0 °C or greater than 0 °C. Please note that
only the temperature of the battery shall be assessed.
i
Batteries can have a 9-digit number imprinted on the
battery casing. The last three digits indicate 1/10 of
the Cold Start Current according to the EN battery
standard.
Example: 544 059 036 = 360A
3. Press E to implement the battery test.
Robert Bosch GmbH