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The Gaus Universal Battery Tester GUBT is particularly designed for testing automotive batteries. But it may also be used for testing all other types of batteries, just by setting the required current and voltage values. The GUBT performs the functions "charge" and "discharge" with selectable current values, as well as pause steps, repetition of a test program as a whole or in parts (cycling) and the registration of the measured data.

Many of the standardized test programs use the current as nominal value. But voltage, power or resistance values may be used as well. A program step may be terminated not only after a specified time, but also when a certain voltage or an Ah (or Wh) values is reached. For registration of the measured values, intervals of time, voltage, amperhours, or energy (Watt-hours) are suitable parameters.

Design and Function

In the standard version, 5 or 10 charge-discharge circuits are combined in one cabinet with a common power supply. Each circuit is provided with its own control unit and the respective power unit. In order to achieve a low residual little ripple on the charge current, the mains supply is ensured by three-phase AC.

The programmable control unit is the core of each charge-discharge circuit. It is a standalone microcomputer system for a data logging and precise control of analogue measured values. It also assumes the processing of stored test programs.

In the manual operating mode, it is possible to select one of the stored programs No 1-8, interrupt and terminate the program by pressing the respective button. Digital instruments for battery voltage and current are fitted on the front panel. Automatic operating mode is made via host computer with GBTS106 party line host computer software.


  1. C-20 twenty hours capacity
  2. Rc spare capacity (reserve)
  3. Cycling
  4. Life time period testing
  5. Charge acceptance
  6. Charge retention
  7. Water consumption.


Figure1. Testing on capacity C-20

Figure 2. Spare capacity Rc

Figure 3. Life time testing in cycles

Figure 4. Charge acceptance


The Programs

All tests programs can be split into steps, where certain operations must be executed under well defined conditions. Each step is fixed in a program line.

Each program step is divided into columns and each column has a headline describing its function.

Column explanations:

  • Column: Label
    • Each program step can be labeled which is used for controlling of program executing.
  • Column: Operation
    • Each program step starts with an operator determining the function of the test circuit. The operator names are simple abbreviations of the respective functions (charge, discharge, ramp, cycle, pause, stop).
  • Column: Set value
    • As nominal values for this step may be entered current, voltage or resistance of power values.
  • Column: Term. condition
    • The termination values current, voltage, time, capacity, energy and temperature determine the end of a program step and thus the beginning of the next program step. In building of condition can be used logical operators AND, OR, NOT.
  • Column: Term. action
    • Possibilities for The Term. Action columns are:
      • GOTO label -transfers program control to the specified program step
      • NEXT -goes to the next program step
      • STOP -terminates program
  • Column: Abort condition
    • The values entered under this column may be the same as for the termination values. However, in this case, the program run will be terminated if one of these limit values is reached.
  • Column: Registration
    • The conditions for the registration are entered into the last column. These may be time intervals or changes in current, voltage, capacity, energy or temperature.

GUBT25/50A12V (5 units 25A/12V and 5 units 50A/12V)

Technical specifications:

Charge/discharge current: 25A/50A
Nominal battery voltage: 12V
Charge voltage range: 10V-18V
Discharge voltage range: 5V-16V
Accuracy: 0,5% of set value
Power circuits: Transistors
Controlled characteristics: Constant current, voltage, power, resistance
Control elements: main switch, program selector switch, party line connection, start and stop buttons
Displays: LED's for power, active, charge, discharge, digital instruments for current and voltage with additional test sockets
Controlled variables: current, voltage, power and resistance
Termination values: charge time, charge voltage, charge current, Ah charged, Wh charged, discharge time, final discharge voltage, discharge current, Ah discharged, Wh discharged
Programmable functions: charge, discharge, pause, cycles, cycles in cycles, "go to" steps
Display of measuring values: during operation permanently on the monitor of the host computer
Displayed and printed measuring values for each program step: voltage, current, time
Power requirements: 3x380V/50Hz 8kW
Ambient temperature: 10 to 40C.

tel / fax: (+381) 11 2279142, (+381) 63 215722, service: (+381) 25 421095