Круглая катушка Гельмгольца серии HHS 5201

HHS 5201
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Катушки Гельмгольца/излучающие рамки HHS 5201 Подробнее




Компания Schwarzbeck Mess-Elektronik - немецкая фирма, разрабатывающая и производящая продукцию для измерений и испытаний на ЭМС (электромагнитную совместимость).

Компания была основана в 1953 году в Германии Гюнтером Шварцбеком, который во всей Европе считается основоположником по созданию приборов для ЭМС-измерений. Головной офис Schwarzbeck Mess-Elektronik расположен в городе Шёнау-им-Шварцвальд.

Компания Schwarzbeck Mess-Elektronik выпускает широкий ряд измерительных антенн с сопутствующими аксессуарами, эквиваленты сети, системы… подробнее




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Основные возможности и технические характеристики

Rundes Helmholtz-Spulenpaar HHS 5201-6

Application:

The Helmholtz-Coils are especially designed to generate precisely defined magnetic fields from DCup to approx. 5 MHz. The generated fields are in a strongly linear relation to the coil current. The field strength can be calculated exactly by analytical (or numerical) methods, based on the coils' geometry, the number of turns and the coil current. Therefore the HHS 5201-6 is ideally suited for the calibration of magnetic field probes or sensors. Due to the high temperature proof copper wire packet it is possible to generate magnetic fields up to approx. 3 kA/m for short times. Typical applications are magnetic immunity testing according to automotive standards or MIL STD 461. When generating magnetic fields with Helmholtz coils the coil current is directly proportional to the magnetic field strength.

The calibration of the magnetic field is finally traceable to a current measurement (or to a voltage drop at a known resistor). The Helmholtz Coil itself does not require a calibration. Alternatively a small loop sensor can be used to determine the actual field strength.

Installation:

The Helmholtz-Coils should be installed on a desk in a sufficiently large separation from sources of unintentional magnetic fields, e.g. transformers in power supplies, conductors carrying high currents, computer monitors, loudspeakers, cathode ray tubes (CRT) and more. All kind of magnetic material (e.g. steel, Nickel, Cobalt) shold be removed from the near surrounding of the coil. The wires which are used to connect the current source with the Helmholtz- Coil should be twisted to avoid an unwanted injection of magnetic flux.

The coil terminals are assigned with the characters A, B, C and D. The generator (current source, audio-amplifier...) is connected to the terminals A and C, the terminals B and D are connected with the short cable supplied with the coil.

An additional verification can be done by measuring the magnetic fieldstrength between the coils. Assuming a wrong connection, the fieldstrength decays very sharply in the center between the coils, because the fields compensate each other.

The Helmholtz coils can be operated at three different coil separations. The recommended operation mode has a coil spacing of S=60 mm (measured between each center plane of the coils), which results in high fieldstrength levels and good field homogenity and medium EuT- volume. Higher fieldstrength levels can be achieved by decreasing the coil separation to less than 60 mm. The useable EuT-volume decreases,  the maximum fieldstrength can be found in the center between the coils. Larger Separations than 60 mm result in an increase of EuT volume, but the fieldstrength and homogenity is reduced. The following drawing shows the HHS 5201-6 with the medium coil spacing / separation S.

The direct current measurement has the disadvantage that the measurement equipment itself heats up, which leads to increased measurement uncertainty or even destruction. The use of a calibrated current transformer clamp has two advantages: it is floating (potential isolation between measuring circuitry and amplifier output circuitry) and without thermal stress. In cases where the voltage drop across a known resistor (e.g. 100 mW / 20 W up to 14 A or 10 mW for highest currents) is measured, it is essential to provide sufficient cooling and potential isolation of mains driven voltmeters.

The determination of the magnetic fieldstrength using a sensor loop (field monitoring loop) allows also potential isolation without temperature stress.

Measurement uncertainties of less than 0.5 dB (typ. < +/- 0.3 dB) are achievable without problems.

HHS 5201-98

Description:

The Helmholtz-Coils are especially designed to generate precisely defined magnetic fields from DC to the upper end of the audio frequency range and beyond. The generated fields are in a strongly linear relation to the coil current. The fieldstrength can be calculated exactly by analytical (or numerical) methods, based on the coils' geometry, the number of turns and the coil current. Therefore the HHS 5201-98 is ideally suited for the calibration of magnetic field probes or sensors. Due to the high temperature proof copper wire packet it is possible to generate magnetic fields up to approx. 64 kA/m for short times. Typical applications are magnetic immunity testing according to automotive standards or MIL STD 461. When generating magnetic fields with Helmholtz coils the coil current is directly proportional to the magnetic fieldstrength. The calibration of the magnetic field is finally traceable to a current measurement (or to a voltage drop at a known resistor). The Helmholtz Coil itself does not require a calibration. Alternatively a small loop sensor can be used to determine the actual fieldstrength.

Installation:

The Helmholtz-Coils should be installed on a desk in a sufficiently large seperation from sources of unintentional magnetic fields, e.g. transformers in power supplies, conductors carrying high currents, computer monitors, loudspeakers, cathode ray tubes (CRT) and more All kind of magnetic material (e.g. steel, Nickel, Cobalt) shold be removed from the near surrounding of the coil. The wires which are used to connect the current source with the Helmholtz-Coil should be twisted to avoid an unwanted injection of magnetic flux.

The coil terminals are assigned with the characters A, B, C and D. The generator (current source, audio-amplifier) is connected to the terminals A and C, the terminals B and D are connected with the short cable supplied with the coil.

An additional verification can be done by measuring the magnetic fieldstrength between the coils. Assuming a wrong connection, the fieldstrength decays very sharply in the center between the coils, because the fields compensate each other.

The  following  drawing  shows  the HHS 5201-98 with the medium coil spacing / separation S.

The direct current measurement has the disadvantage that the measurement equipment itself heats up, which leads to increased measurement uncertainty or even destruction. The use of a calibrated current transformer clamp has two advantages: it is floating (potential isolation between measuring circuitry and amplifier output circuitry) and without thermal stress. In cases where the voltage drop across a known resistor (e.g. 100 mW / 20 W up to 14 A or 10 mW for highest currents) is measured, it is essential to provide sufficient cooling and potential isolation of mains driven voltmeters.

The determination of the magnetic field- strength using a sensor loop (field monitoring loop) allows also potential isolation without temperature stress.

Measurement uncertainties of less than 0.5 dB (typ. < +/- 0.3 dB) are achievable without problems.


Свернуть Развернуть
Основные возможности и технические характеристики

Rundes Helmholtz-Spulenpaar HHS 5201-6

Application:

The Helmholtz-Coils are especially designed to generate precisely defined magnetic fields from DCup to approx. 5 MHz. The generated fields are in a strongly linear relation to the coil current. The field strength can be calculated exactly by analytical (or numerical) methods, based on the coils' geometry, the number of turns and the coil current. Therefore the HHS 5201-6 is ideally suited for the calibration of magnetic field probes or sensors. Due to the high temperature proof copper wire packet it is possible to generate magnetic fields up to approx. 3 kA/m for short times. Typical applications are magnetic immunity testing according to automotive standards or MIL STD 461. When generating magnetic fields with Helmholtz coils the coil current is directly proportional to the magnetic field strength.

The calibration of the magnetic field is finally traceable to a current measurement (or to a voltage drop at a known resistor). The Helmholtz Coil itself does not require a calibration. Alternatively a small loop sensor can be used to determine the actual field strength.

Installation:

The Helmholtz-Coils should be installed on a desk in a sufficiently large separation from sources of unintentional magnetic fields, e.g. transformers in power supplies, conductors carrying high currents, computer monitors, loudspeakers, cathode ray tubes (CRT) and more. All kind of magnetic material (e.g. steel, Nickel, Cobalt) shold be removed from the near surrounding of the coil. The wires which are used to connect the current source with the Helmholtz- Coil should be twisted to avoid an unwanted injection of magnetic flux.

The coil terminals are assigned with the characters A, B, C and D. The generator (current source, audio-amplifier...) is connected to the terminals A and C, the terminals B and D are connected with the short cable supplied with the coil.

An additional verification can be done by measuring the magnetic fieldstrength between the coils. Assuming a wrong connection, the fieldstrength decays very sharply in the center between the coils, because the fields compensate each other.

The Helmholtz coils can be operated at three different coil separations. The recommended operation mode has a coil spacing of S=60 mm (measured between each center plane of the coils), which results in high fieldstrength levels and good field homogenity and medium EuT- volume. Higher fieldstrength levels can be achieved by decreasing the coil separation to less than 60 mm. The useable EuT-volume decreases,  the maximum fieldstrength can be found in the center between the coils. Larger Separations than 60 mm result in an increase of EuT volume, but the fieldstrength and homogenity is reduced. The following drawing shows the HHS 5201-6 with the medium coil spacing / separation S.

The direct current measurement has the disadvantage that the measurement equipment itself heats up, which leads to increased measurement uncertainty or even destruction. The use of a calibrated current transformer clamp has two advantages: it is floating (potential isolation between measuring circuitry and amplifier output circuitry) and without thermal stress. In cases where the voltage drop across a known resistor (e.g. 100 mW / 20 W up to 14 A or 10 mW for highest currents) is measured, it is essential to provide sufficient cooling and potential isolation of mains driven voltmeters.

The determination of the magnetic fieldstrength using a sensor loop (field monitoring loop) allows also potential isolation without temperature stress.

Measurement uncertainties of less than 0.5 dB (typ. < +/- 0.3 dB) are achievable without problems.

HHS 5201-98

Description:

The Helmholtz-Coils are especially designed to generate precisely defined magnetic fields from DC to the upper end of the audio frequency range and beyond. The generated fields are in a strongly linear relation to the coil current. The fieldstrength can be calculated exactly by analytical (or numerical) methods, based on the coils' geometry, the number of turns and the coil current. Therefore the HHS 5201-98 is ideally suited for the calibration of magnetic field probes or sensors. Due to the high temperature proof copper wire packet it is possible to generate magnetic fields up to approx. 64 kA/m for short times. Typical applications are magnetic immunity testing according to automotive standards or MIL STD 461. When generating magnetic fields with Helmholtz coils the coil current is directly proportional to the magnetic fieldstrength. The calibration of the magnetic field is finally traceable to a current measurement (or to a voltage drop at a known resistor). The Helmholtz Coil itself does not require a calibration. Alternatively a small loop sensor can be used to determine the actual fieldstrength.

Installation:

The Helmholtz-Coils should be installed on a desk in a sufficiently large seperation from sources of unintentional magnetic fields, e.g. transformers in power supplies, conductors carrying high currents, computer monitors, loudspeakers, cathode ray tubes (CRT) and more All kind of magnetic material (e.g. steel, Nickel, Cobalt) shold be removed from the near surrounding of the coil. The wires which are used to connect the current source with the Helmholtz-Coil should be twisted to avoid an unwanted injection of magnetic flux.

The coil terminals are assigned with the characters A, B, C and D. The generator (current source, audio-amplifier) is connected to the terminals A and C, the terminals B and D are connected with the short cable supplied with the coil.

An additional verification can be done by measuring the magnetic fieldstrength between the coils. Assuming a wrong connection, the fieldstrength decays very sharply in the center between the coils, because the fields compensate each other.

The  following  drawing  shows  the HHS 5201-98 with the medium coil spacing / separation S.

The direct current measurement has the disadvantage that the measurement equipment itself heats up, which leads to increased measurement uncertainty or even destruction. The use of a calibrated current transformer clamp has two advantages: it is floating (potential isolation between measuring circuitry and amplifier output circuitry) and without thermal stress. In cases where the voltage drop across a known resistor (e.g. 100 mW / 20 W up to 14 A or 10 mW for highest currents) is measured, it is essential to provide sufficient cooling and potential isolation of mains driven voltmeters.

The determination of the magnetic field- strength using a sensor loop (field monitoring loop) allows also potential isolation without temperature stress.

Measurement uncertainties of less than 0.5 dB (typ. < +/- 0.3 dB) are achievable without problems.


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Характеристики
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HHS 5201-6 - Circular Helmholtz Coils
Number of turns: 6
Maximum Coil Current: 40 A (1 min.)
15 A (15 min.)
Nominal Coil Current: 12 A continuous
Coil Spacings (centered): 50 ... 80 mm
The following data refers to a coil separation of 60 mm
Max. Magn. Field Strength: 2860 A/m (1 min.)
Nominal Magn. Field Strength: 860 A/m continuous
Magn. Field Strength, 1 A Coil Current: 71.55 A/m
Coil Diameter: 120 mm
Mechanical Dimensions: 290 x 220 x 130 mm
Terminals: 4 mm female
Inductance (Single Coil): 8 µH
Inductance (Coil Pair): 18.7 µH / 50 mm
18.2 µH / 60 mm
17.9 µH / 70 mm
Usable Frequency Range: DC - 5 MHz
Resonance Frequency: > 8 MHz
Weight: 2.8 kg
HHS 5201-98 - Circular Helmholtz Coils
Number of turns: 98
Maximum Coil Current: 40 A (1 min.)
15 A (15 min.)
Nominal Coil Current: 12 A continuous
Coil Spacings (centered): approx.  29 ... 95 mm
Max. Magn. Field Strength: 64 kA/m (1 min.)
Nominal Magn. Field Strength: 20 kA/m continuous
Magn. Field Strength, 1 A Coil Current: 1598 A/m
Conversion Current-Fieldstrength: 64.07 dB/m
Coil Diameter: 84 mm (58-110 mm)
Free Coil Distance for DuT: 0 ... 66 mm
Mechanical Dimensions: 240 x 240 x 130 mm
Terminals: 4 mm female
Inductance (Single Coil): 0.84 mH
Inductance (Coil Pair): 2.3 mH / 30 mm
2.0 mH / 50 mm
1.8 mH / 90 mm
Usable Frequency Range: DC - 200 kHz
Resonance Frequency: > 600 kHz
Weight: 4.1 kg

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Модели
HHS 5201-6
Круглая катушка Гельмгольца HHS 5201-6, 6 витков
По запросу
- шт +
HHS 5201-98
Круглая катушка Гельмгольца HHS 5201-98, 98 витков
По запросу
- шт +
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