Calibration solutions for electromobility

Calibration of your current transformers

Current transformers (instrument transformers) are used to measure currents and perform a wide variety of tasks. Among other things, a current transformer is capable of converting a primary current into a readily processable electrical signal, in the form of a proportional current or voltage.

At our own measuring station developed for measuring transformers we carry out full calibrations for your current transformers. We are able to carry out ISO and DAkkS calibrations:

• ISO: AC/DC maximum 4000 A at frequencies of maximum 10 kHz
• DAkkS: AC maximum 1000 A, DC maximum 4000 A at frequencies of maximum 2 kHz

In addition, we are able to calibrate non-sinusoidal dynamic waveforms by the sampling method. We achieve the required high accuracies with the help of our specially developed measurement setup, which consists of 40 kg of pure copper and has a defined cable routing. This minimizes interference effects and increases the current carrying capacity immensely. The possibility of easily dismantling the test setup and thus quickly integrating the test item into the test setup leads to an optimized calibration procedure.

Calibration of power meters and analyzers

The calibration of your power measuring instruments is carried out in a direct measuring procedure via three specially equipped measuring stations with highly accurate calibrators. We can carry out DAkkS calibrations in the following measuring ranges:

• DC voltage between 10 V and 1100 V
• Current range from 0 to 1000 A DC at maximum 1000 kWs
• AC voltage between 0 and 1000 V at a maximum frequency of 1 MHz
• Current range from 0 to 100 A AC at a maximum frequency of 10 kHz.

Power range completes the consideration of active, reactive and apparent power from 50 µW/ µVar / µVA to 80 kW/ kVar / kVA at a maximum of 10kHz. The traceability of these measuring stations takes place in our in-house reference laboratory.

Calibration of energy and electricity meters

Electricity and energy meters are essential for recording the real consumption of an electric car, as they correlate directly with the battery status. Calibration of your energy and electricity meters is possible at any power factor in our accredited laboratories. We calibrate each phase of your instrument for you with high precision and low measurement uncertainty:

• Currents up to 100 A
• Voltages up to 1000 V and
• at technical frequencies up to 400 Hz.

The connection of our standards to the respective energy meter is carried out separately for current and voltage measured values. Any power and power factor can be generated by this power simulation. The energy to be measured can thus be determined via the feedback and synchronous measurement of the time in the measuring system. Here, too, any energy quantities from Wh to MWh can be calibrated by Testo Industrial Services via the scalability of the measuring time.

Measuring amplifiers and measuring modules

Measuring modules are versatile and very robust, as they are often used at high potentials and must be resistant to EMC and ESD. During the development of hybrid and electric vehicles, temperature measurements must be carried out on a wide variety of components, and measurement modules are often used here. 

The calibration is very individual since each measuring module is also individually constructed. Through our many years of experience, we calibrate your measurement modules over our complete accredited measurement ranges, such as current, voltage, temperature and frequency. Furthermore, we can perform the calibration at different ambient temperatures in climatic chambers specially configured for this measurement. This is particularly relevant for measuring modules that are exposed to extreme temperatures in later use.