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Electrical quantities

Electrical calibrations are used in almost all areas of research, development, industry, technology, medicine, food technology and the environment. They play a key role in metrology, as most measured quantities are converted into electrical signals at the sensor. We calibrate electrical test equipment from all manufacturers – from standard multimeters and oscilloscopes to high-end measuring devices and reference standards. High-quality equipment for standard electrical sizes and modern technology guarantee the required quality when calibrating your measuring equipment. Our measurement technology experts work in well-equipped laboratories under stable temperature conditions.

Overview of quantities Overview of measuring devices

Kalibrierung im DC/NF-Labor


Your calibration offer

We’ll be happy to provide you with a no obligation quote for the calibration of your measuring devices.

Calibrator amperage

Calibration at the highest level

The DC, low frequency and industrial calibration department is accredited by the Deutsche Akkreditierungsstelle GmbH (DAkkS) and offers measuring instrument calibration in the electrical field, for example with measurement uncertainties of less than one millionth of the DC voltage. Even in extreme areas of electrical measurement technology, such as for the calibration of the smallest current shunts, high-ohm resistors, miniature current sources or nanovoltmeters, we perform accredited calibration and issue calibration certificates with an accreditation symbol.

The options for mains power calibration and synthesis are also exceptional. esz AG is one of the few laboratories in Germany to operate a mains power standard for the calibration of power analysers, harmonic and flicker measuring instruments.

Lieferwagen Geräteabholung


Logistics Expert

With the esz AG collection and delivery service, your sensitive test equipment is always in safe hands. Choose between individual collection and delivery or our weekly delivery service with fixed routes.

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esz works with quantum precision

The quantum calibrator is the measure of all things when it comes to measuring DC voltage. esz AG is one of the few industrial calibration laboratories in the world with such a precise quantum calibrator for multimeters, voltage calibrators and voltage standards. As the Josephson effect is defined directly via a natural constant, esz AG has the traceability virtually in-house. This means that the device does not need to be calibrated, only ring comparisons are required for validation. As an esz AG customer, you benefit from this time and cost-saving advantage.

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High frequency
High frequency

High frequency

With measurement capabilities up to 67 GHz, esz AG’s high-frequency laboratory is one of the best-equipped laboratories in Europe. We use our reference devices to calibrate the RF standards of all users in the fields of communications electronics, telecommunications, avionics, radio communications and high-frequency technology as well as measuring devices from industry and research in Germany and abroad in various coaxial systems with traceability and maximum accuracy. The methods used correspond to the globally recognised state of the art and are carried out in a similar way in many leading calibration laboratories. Most high-frequency quantities are accredited by the German Accreditation Body (DAkkS).

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Your benefits

  • Full service – everything from a single source
  • DAkkS-accredited calibration of almost all high-frequency test equipment
  • In-house Josephson voltage standard
  • Repair, adjustment and calibration possible in our own service laboratory

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DAkkS & Factory/ISO calibration

  • DC and low frequency
    • DC and AC voltage
    • DC and AC voltage meters
    • DC resistance
    • AC resistance
    • Charge
    • Energy
    • Inductance
    • Capacity
    • Phase difference between sinusoidal voltage signals
    • Phase difference between sinusoidal input current and sinusoidal output voltage
    • Phase difference between sinusoidal output signal and sinusoidal input current
    • Phase difference between sinusoidal voltage signal and sinusoidal current signal
    • Phase difference between fundamental and nth harmonic of a voltage signal
    • Phase difference between base wave and nth harmonic of a current signal
    • AC reactive power
    • AC apparent power
    • Loss factor
    • Sound pressure level, A-weighted
    • DC voltage, ripple factor
    • Voltage ratio (DC voltage)
    • High-voltage measured values
    • AC reactive power
    • Power factor
    • Electrical energy (defibrillator tester)

Time and Frequency

  • Time interval
  • Frequency and speed
High frequency quantities

  • Digital multimeter
  • Analogue multimeter
  • Calibrators
  • Voltage and current sources
  • Resistors
  • High voltage devices
  • Flicker harmonics and power quality meters
  • Oscilloscope
  • Function generators
  • LCR measuring bridges
  • Capacity
  • Induction
  • DC and AC voltage meters
  • Magnetic field meters
  • Measurement data acquisition cards
  • Decades
  • Counter

A team of experts from esz AG played a key role in the development of the world’s first industrially used AC/DC Josephson quantum voltmeter as part of a major research project of the German Federal Ministry of Economics and Technology. This makes use of the inverse Josephson effect by which the electrical voltage is measured directly via a natural constant – the Josephson constant KJ – can be defined. The AC/DC Josephson quantum voltmeter is used to measure AC voltages of up to 7.19 volts at frequencies from 10 Hz to 2 kHz in addition to DC voltage sources. This enables esz AG to reduce measurement uncertainties by at least a factor of 100 for DC voltages and by a factor of 10 for AC voltages.

Electrical calibrations have been an integral part of the esz AG laboratory since 1980. At that time, as a service laboratory still specialising in the calibration of repaired devices, the company worked very early on with high-end calibration techniques and the first AC/DC calibrators, the use of which had previously only been reserved for the military, aviation and medical technology.