Calibration of Magnetic Field Measuring Devices
Projekt Elektronik Services
Our Offer to You
Calibration According to ISO 9001
Calibration and Adjustment
High-precision measuring devices must deliver exact values within defined limits. In order to ensure this for our magnetic field measuring devices and probes, we always supply all products with a factory calibration certificate – whether for purchase, rental or testing.
Because we manufacture our equipment in-house, we have the expertise and testing facilities to calibrate all components. If we discover deviations from the reference values, we make the necessary adjustments.
Our test equipment monitoring is certified according to ISO 9001. This is what our calibration certificate says:
- All our devices are delivered with a factory calibration certificate as proof in accordance with ISO 9001
- For our teslameter and magnetic field probes, the calibration with traceability between ±150mT and ±1800mT to the national standards of the Physikalisch-Technische Bundesanstalt is confirmed.
- Our factory calibration certificate indicates the measurement uncertainty within the calibration that has been carried out.
- The deviations of all measuring points are shown in tabular form. For active probes, 19 test points each.
As an additional option, we offer you the creation of a linearity curve that records the individual error curve of a probe at up to six different temperatures.
Test points between +1800mT and -1800mT are also possible according to customer requirements.
This means that the most important areas for you can be tested in particular.
We also offer individual calibrations and chain calibrations. Our Application Note PE023 under Downloads provides you with a decision-making aid.
We calibrate and adjust our own magnetic field measuring devices and magnetic field probes. Third-party devices from other manufacturers that fit mechanically into our testing devices can also be calibrated. If adjustment instructions are available, we will also take care of the adjustment.
We would be glad to inform you about the technical possibilities and the costs of our service. It is best to arrange an appointment using the contact form.
Calibration with Traceability
Calibration of our own devices: We offer calibration with traceability between ±150mT and ±1800mT for our devices.
Calibration of third-party devices: We also offer calibration with traceability between ±150mT and ±1800mT for devices from other manufacturers.
Calibration of Sensors
Calibration with traceability between ±150mT and ±1800mT for different magnetic field sensors, also at different temperatures.
Calibration and Adjustment
As a manufacturer, we have the necessary test equipment and expertise to adjust and calibrate the magnetic field measuring devices and measuring probes that we manufacture.
If we determine during the calibration that an adjustment is necessary, we will make it. The adjustment made is also noted on the factory calibration certificate.
Calibration Certificate
We supply a factory calibration certificate with our devices without measured values as proof of calibration in accordance with ISO 9001: Example of a calibration certificate for one of our AS-active-probes.
For our teslameters and magnetic field probes, we offer calibration with traceability between ±150mT and ±1800mT to the national standards of the Physikalisch-Technische Bundesanstalt (PTB ).
We confirm the traceability with our calibration certificate. We also state the measurement uncertainty of the calibration carried out in our factory calibration certificate.
Our test equipment monitoring is subject to ISO 9001 certification.
Linearity Curve Option
As an optional additional service, we offer the creation of a linearity curve for our AS-active-probes. We record the individual error curve of the probe depending on the strength of the magnetic field. In addition, for many probes, the linearity curve is generated at different temperatures.
Examples of typical linearity curves can be found for each probe in the data sheet AS-active-probes and under PE003 linearity curves.
Calibration Interval for Our Teslameter and Magnetic Field Probes
No general statement can be made for the calibration interval. The interval depends, among other things, on the frequency of use and the resulting stress. A laboratory device that is only used twice a year certainly needs to be calibrated less often than a device that is used every day in production.
The requirements of the own test equipment management the determination of the calibration interval.
By default, we recommend annual calibration for our products.
Calibration
With our testing device we have the possibility to calibrate magnetic field measuring devices (Teslameter or Gaussmeter) from other manufacturers, both with transversal and with axial magnetic field probes.
Adjustment
If adjustment instructions are available, we can also adjust the devices.
Coordination before Calibration
In the run-up to the calibration, it must be clarified whether the probes fit mechanically into our testing devices. It may be necessary to produce a suitable holder as a one-off setup effort.
The calculation of the measurement uncertainty is also necessary when calibrating a device type for the first time. This includes the compilation of the relevant parameters of the calibration item. The calibration certificate can then be created with the result of the measurement uncertainty calculation.
Calibration can include display reading, digital outputs, and analog outputs.
Many devices have the option of switching between three or four measuring ranges. We calibrate the Tesla measuring range of a device in the range of ±1.8 T with measuring points spaced 200 mT apart. In this way, the non-linearities that frequently occur in devices based on Hall elements are also recorded. For the smaller measuring ranges, we carry out a calibration with 5 measuring points (0, ± full measuring range, ± half measuring range).
Our test device allow a continuous specification in the entire field area. Therefore, other measuring points are also possible after consultation. In addition, our testing device for transverse probes is equipped with a temperature chamber.
In addition to a fixed temperature in the room temperature range (e.g. 20 °C or 25 °C), it is also possible to calibrate in a wide temperature range (-20 °C to +150 °C).
Calibration Certificate
In the factory calibration certificate, we confirm the calibration with traceability between ±150mT and ±1800mT to the national standards of the Physikalisch-Technische Bundesanstalt (PTB ). Our test equipment monitoring is subject to ISO 9001 certification.
In the factory calibration certificate, we list the measurement data of the calibration and the associated measurement uncertainty. If we have information on the tolerance of the calibration item, we will also include information on compliance with the limit values in the calibration certificate .
Calibration of Magnetic Field Sensors
With our testing devices, we also calibrate magnetic field sensors in the field range ±1.8 T and in the temperature range from -20 °C to +150 °C. We calculate the measurement uncertainty and state this in the calibration certificate.
The calibration is carried out with traceability to the national standards of the Physikalisch-Technische Bundesanstalt (PTB ). Our test equipment monitoring is subject to ISO 9001 certification.
Coordination before Calibrating the Magnetic Field Sensors
In the run-up to the calibration, it is clarified whether the sensors mechanically fit into our testing devices. It may be necessary to produce a suitable holder as a one-off setup effort.
The calculation of the measurement uncertainty is also necessary when calibrating a sensor type for the first time. This includes the compilation of the relevant parameters of the calibration item.
The scope of calibration is coordinated with regard to
- Field area and checkpoints
- temperature range
- supply voltage
- driving current
- Accuracy requirements of the measured values
Our test devices allow test points to be specified in the entire field area. Therefore, an individual distribution of the measuring points is possible after consultation. Sensors based on Hall elements often exhibit strong non-linearities at higher fields. A minimum number of test points is required to be able to capture these sufficiently.
In addition, our testing device is equipped with a temperature chamber. In addition to a fixed temperature in the room temperature range (e.g. 20 °C or 25 °C), it is also possible to calibrate in a wide temperature range (-20 °C to +150 °C).
Magnetic Test Equipment from Projekt Elektronik
We have a wide range of measuring and magnet equipment for the calibration and adjustment processes. For example, we use both axial and transverse electromagnets to calibrate and adjust magnetic field probes. The measurement processes are also supported with temperature chambers in the magnets. Various coils (e.g. Garrett coils) are used for weak magnetic fields.
Test Equipment for strong Magnetic Fields
Transverse Magnet
To calibrate transverse magnetic field probes, we have a large electromagnet (weight approx. 2.0 t) with a pole shoe diameter of 140 mm and an air gap of 20 mm. The probe of a special teslameter serves as a reference for the field control and the probes to be calibrated.
We have a high-precision NMR magnetometer that is regularly tested by the Physikalisch-Technische Bundesanstalt (PTB ). This, in turn, is used to regularly calibrate our reference device, which ensures traceability to national standards.
The field control allows us to specify any positive and negative flux density value in the range of ±1.8 T in the air gap of the magnet.
The quality of the test stand is given by the high quality of the field control. In this way, a high level of reproducibility of a few microteslas and extreme field stability are achieved.
Temperature Chamber of the Transverse Magnet
The air gap of the transversal magnet is equipped with a controlled temperature chamber, with which we set temperatures in the range from -20 °C to +150 °C.
By measuring at different temperatures, we record the exact temperature behavior of the probes.
Axial Magnet
Big Transverse Magnets
For special measurements, we have another very large electromagnet (weight approx. 3 t) with a pole shoe diameter of 250 mm and an air gap of 75 mm.
Due to the large volume of the generated magnetic field, extensive structures and even entire devices can be tested. This magnet can also be equipped with field control. The usable field range is ±500 mT.
Test Equipment for weak Magnetic Fields
Garret Coils
Two Garrett coils are available as standards for the display of weak magnetic fields. These coils have an inner diameter of 100mm and 130mm.
These are air-core coils that are wound onto temperature-independent ceramic bodies. A particularly large homogeneous area within the coil is provided by a special winding distribution.
The coil factor of both coils is regularly calibrated by PTB, which ensures traceability to national standards.
Any positive and negative fields in the range of ±200 µT can be generated with these coils.
Zero Chambers
We have several Zero Chamber of different sizes to shield from the earth’s magnetic field, which is present everywhere.
Are You Interested in Calibrating Your Measuring Device?
We will be glad to answer your questions about calibrations, appointments and costs personally.
Call us or write us your questions.