Круглая катушка Гельмгольца серии HHS 5206

HHS 5206
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HHS 5206
HHS 5206

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Катушки Гельмгольца/излучающие рамки HHS 5206 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

HHS 5206-4

Description:

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 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 5206-4 is ideally suited for the calibration of magnetic field probes or sensors. Due to the high temperature proof Teflon-coated wire packet it is possible to generate magnetic fields up to approx. 530 A/m (for a short time). 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 is usually considered as primary standard due to the easily calculable relation between current and field strength. If this relation should be controlled, a loop sensor or monitoring loop 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 so on. All kinds of magnetic material (e.g. steel, nickel, cobalt) should 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 con- nected 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.

Field strength determination:

There are two methods to determine the actual magnetic field strength:

1. Determination of the coil current

  • Current transformer clamp,
  • Measuring the voltage drop across a well- known resistor,
  • Direct current measurement.

2.   Determination of the field strength using a field monitoring loop.

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. Using small shunt resistor values causes less heat dissipation may however cause higher measurement uncertainties because the wanted shunt resistance is hardly higher than unwanted contact resistances. Beyond several kHz the inductance of the shunt resistor may become dominant. For that reason, a low inductive shunt resistor with well known impedance Z like the SHUNT 9571 should be used.

The determination of the magnetic field strength using a sensor loop (field monitoring loop) allows also potential isolation without temperature stress. The FESP 5133-7/41 or the FESP 5134-40 are suitable for this purpose.

HHS 5206-8

Description:

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 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 5206-8 is ideally suited for the calibration of magnetic field probes or sensors. Due to the high temperature proof Teflon-coated wire packet it is possible to generate magnetic fields up to approx. 1000 A/m (for a short time). Typical applications are magnetic immunity testing according to automotive standards or MIL-461F. 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 is usually considered as primary standard due to the easily calculable relation between current and field strength. If this relation should be controlled, a loop sensor or monitoring loop 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 so on. All kinds of magnetic material (e.g. steel, nickel, cobalt) should 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.

Field strength determination:

There are two methods to determine the actual magnetic field strength:

1. Determination of the coil current

  • Current transformer clamp,
  • Measuring the voltage drop across a well- known resistor,
  • Direct current measurement.

2.   Determination of the field strength using a field monitoring loop.

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. Using small shunt resistor values causes less heat dissipation may however cause higher measurement uncertainties because the wanted shunt resistance is hardly higher than unwanted contact resistances. Beyond several kHz the inductance of the shunt resistor may become dominant. For that reason, a low inductive shunt resistor with well known impedance Z like the SHUNT 9571 should be used.

The determination of the magnetic field strength using a sensor loop (field monitoring loop) allows also potential isolation without temperature stress. The FESP 5133-7/41 is suitable for this purpose.

HHS 5206-16

Description:

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 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 5206-16 is ideally suited for the cali- bration of magnetic field probes or sen- sors. Due to the high temperature proof Teflon-coated wire packet it is possible to generate magnetic fields up to approx. 2000 A/m (for a short time). Typical appli- cations are magnetic immunity testing according to automotive standards or MIL-461F. 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 is usually con- sidered as primary standard due to the easily calculable relation between current and field strength. If this relation should be controlled, a loop sensor or monitoring loop 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 sup- plies, conductors carrying high currents, computer monitors, loudspeakers, cath- ode ray tubes (CRT) and so on. All kinds of magnetic material (e.g. steel, nickel, cobalt) should 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 magnet- ic flux.

The coil terminals are assigned with the characters A, B, C and D. The generator (current source, audio-amplifier...) is con- nected to the terminals A and C, the ter- minals 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 oth- er.

Field strength determination:

There are two methods to determine the actual magnetic field strength:

1. Determination of the coil current

  • Current transformer clamp
  • Measuring the voltage drop across a well known resistor
  • Direct current measurement

2.   Determination of the field strength using a field monitoring loop

The direct current measurement has the dis- advantage 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 (poten- tial 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. Using small shunt resistor values causes less heat dissipation may however cause higher measurement uncertainties because the want- ed shunt resistance is hardly higher than un- wanted contact resistances. Beyond several kHz the inductance of the shunt resistor may become dominant. For that reason a low in- ductive shunt resistor with well known imped- ance Z like the SHUNT 9570 should be used. The determination of the magnetic field strength using a sensor loop (field monitoring loop) allows also potential isolation without temperature stress. The FESP 5133-7/41 is suitable for this purpose.

HHS 5206-25

Application:

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 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 5206-25 is ideally suited for the cali- bration of magnetic field probes or sen- sors. Due to the high temperature proof Teflon-coated wire packet it is possible to generate magnetic fields up to approx. 2700 A/m (for a short time). Typical appli- cations are magnetic immunity testing according to automotive standards or MIL-461F. 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 is usually con- sidered as primary standard due to the easily calculable relation between current and field strength. If this relation should be controlled, a loop sensor or monitoring loop 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 sup- plies, conductors carrying high currents, computer monitors, loudspeakers, cath- ode ray tubes (CRT) and so on. All kinds of magnetic material (e.g. steel, nickel, cobalt) should 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.

Field strength determination:

There are two methods to determine the actual magnetic field strength:

1. Determination of the coil current

  • Current transformer clamp
  • Measuring the voltage drop across a well-known resistor
  • Direct current measurement

2.   Determination of the field strength using a field monitoring loop

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 ad- vantages: 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 suffi- cient cooling and potential isolation of mains driven voltmeters. Using small shunt resistor values causes less heat dissipation may however cause higher measurement uncertainties because the wanted shunt resistance is hardly higher than unwanted contact resistances. Beyond several kHz the inductance of the shunt resistor may become dominant. For that reason a low inductive shunt resistor with well-known impedance Z like the SHUNT 9570 should be used.

The determination of the magnetic field strength using a sensor loop (field monitor- ing loop) allows also potential isolation without temperature stress. The FESP 5133-7/41 is suitable for this purpose.

HHS 5206-132

Description:

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 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 5206-132 is ideally suited for the calibration of magnetic field probes or sensors. Typical applications are magnet- ic immunity testing according to automo- tive standards or MIL-461F. When gener- ating 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 is usually con- sidered as primary standard due to the easily calculable relation between current and field strength. If this relation should be controlled, a loop sensor or monitoring loop 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 sup- plies, conductors carrying high currents, computer monitors, loudspeakers, cath- ode ray tubes (CRT) and so on. All kinds of magnetic material (e.g. steel, nickel, cobalt) should 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 magnet- ic flux.

The coil terminals are assigned with the characters A, B, C and D. The generator (current source, audio-amplifier...) is con- nected to the terminals A and C, the ter- minals 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 oth- er.

Field strength determination:

There are two methods to determine the actual magnetic field strength:

1. Determination of the coil current

  • Current transformer clamp
  • Measuring the voltage drop across a well known resistor
  • Direct current measurement

2.   Determination of the field strength using a field monitoring loop

The direct current measurement has the dis- advantage 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 (poten- tial 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 meas- ured, it is essential to provide sufficient cooling and potential isolation of mains driven voltme- ters. Using small shunt resistor values causes less heat dissipation may however cause higher measurement uncertainties because the wanted shunt resistance is hardly higher than unwanted contact resistances. Beyond several kHz the inductance of the shunt resistor may become dominant. For that reason a low in- ductive shunt resistor with well known imped- ance Z like the SHUNT 9571 should be used. The determination of the magnetic field strength using a sensor loop (field monitoring loop) allows also potential isolation without temperature stress. The FESP 5133-7/41 is suitable for this purpose.

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Основные возможности и технические характеристики

HHS 5206-4

Description:

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 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 5206-4 is ideally suited for the calibration of magnetic field probes or sensors. Due to the high temperature proof Teflon-coated wire packet it is possible to generate magnetic fields up to approx. 530 A/m (for a short time). 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 is usually considered as primary standard due to the easily calculable relation between current and field strength. If this relation should be controlled, a loop sensor or monitoring loop 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 so on. All kinds of magnetic material (e.g. steel, nickel, cobalt) should 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 con- nected 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.

Field strength determination:

There are two methods to determine the actual magnetic field strength:

1. Determination of the coil current

  • Current transformer clamp,
  • Measuring the voltage drop across a well- known resistor,
  • Direct current measurement.

2.   Determination of the field strength using a field monitoring loop.

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. Using small shunt resistor values causes less heat dissipation may however cause higher measurement uncertainties because the wanted shunt resistance is hardly higher than unwanted contact resistances. Beyond several kHz the inductance of the shunt resistor may become dominant. For that reason, a low inductive shunt resistor with well known impedance Z like the SHUNT 9571 should be used.

The determination of the magnetic field strength using a sensor loop (field monitoring loop) allows also potential isolation without temperature stress. The FESP 5133-7/41 or the FESP 5134-40 are suitable for this purpose.

HHS 5206-8

Description:

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 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 5206-8 is ideally suited for the calibration of magnetic field probes or sensors. Due to the high temperature proof Teflon-coated wire packet it is possible to generate magnetic fields up to approx. 1000 A/m (for a short time). Typical applications are magnetic immunity testing according to automotive standards or MIL-461F. 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 is usually considered as primary standard due to the easily calculable relation between current and field strength. If this relation should be controlled, a loop sensor or monitoring loop 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 so on. All kinds of magnetic material (e.g. steel, nickel, cobalt) should 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.

Field strength determination:

There are two methods to determine the actual magnetic field strength:

1. Determination of the coil current

  • Current transformer clamp,
  • Measuring the voltage drop across a well- known resistor,
  • Direct current measurement.

2.   Determination of the field strength using a field monitoring loop.

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. Using small shunt resistor values causes less heat dissipation may however cause higher measurement uncertainties because the wanted shunt resistance is hardly higher than unwanted contact resistances. Beyond several kHz the inductance of the shunt resistor may become dominant. For that reason, a low inductive shunt resistor with well known impedance Z like the SHUNT 9571 should be used.

The determination of the magnetic field strength using a sensor loop (field monitoring loop) allows also potential isolation without temperature stress. The FESP 5133-7/41 is suitable for this purpose.

HHS 5206-16

Description:

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 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 5206-16 is ideally suited for the cali- bration of magnetic field probes or sen- sors. Due to the high temperature proof Teflon-coated wire packet it is possible to generate magnetic fields up to approx. 2000 A/m (for a short time). Typical appli- cations are magnetic immunity testing according to automotive standards or MIL-461F. 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 is usually con- sidered as primary standard due to the easily calculable relation between current and field strength. If this relation should be controlled, a loop sensor or monitoring loop 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 sup- plies, conductors carrying high currents, computer monitors, loudspeakers, cath- ode ray tubes (CRT) and so on. All kinds of magnetic material (e.g. steel, nickel, cobalt) should 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 magnet- ic flux.

The coil terminals are assigned with the characters A, B, C and D. The generator (current source, audio-amplifier...) is con- nected to the terminals A and C, the ter- minals 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 oth- er.

Field strength determination:

There are two methods to determine the actual magnetic field strength:

1. Determination of the coil current

  • Current transformer clamp
  • Measuring the voltage drop across a well known resistor
  • Direct current measurement

2.   Determination of the field strength using a field monitoring loop

The direct current measurement has the dis- advantage 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 (poten- tial 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. Using small shunt resistor values causes less heat dissipation may however cause higher measurement uncertainties because the want- ed shunt resistance is hardly higher than un- wanted contact resistances. Beyond several kHz the inductance of the shunt resistor may become dominant. For that reason a low in- ductive shunt resistor with well known imped- ance Z like the SHUNT 9570 should be used. The determination of the magnetic field strength using a sensor loop (field monitoring loop) allows also potential isolation without temperature stress. The FESP 5133-7/41 is suitable for this purpose.

HHS 5206-25

Application:

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 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 5206-25 is ideally suited for the cali- bration of magnetic field probes or sen- sors. Due to the high temperature proof Teflon-coated wire packet it is possible to generate magnetic fields up to approx. 2700 A/m (for a short time). Typical appli- cations are magnetic immunity testing according to automotive standards or MIL-461F. 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 is usually con- sidered as primary standard due to the easily calculable relation between current and field strength. If this relation should be controlled, a loop sensor or monitoring loop 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 sup- plies, conductors carrying high currents, computer monitors, loudspeakers, cath- ode ray tubes (CRT) and so on. All kinds of magnetic material (e.g. steel, nickel, cobalt) should 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.

Field strength determination:

There are two methods to determine the actual magnetic field strength:

1. Determination of the coil current

  • Current transformer clamp
  • Measuring the voltage drop across a well-known resistor
  • Direct current measurement

2.   Determination of the field strength using a field monitoring loop

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 ad- vantages: 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 suffi- cient cooling and potential isolation of mains driven voltmeters. Using small shunt resistor values causes less heat dissipation may however cause higher measurement uncertainties because the wanted shunt resistance is hardly higher than unwanted contact resistances. Beyond several kHz the inductance of the shunt resistor may become dominant. For that reason a low inductive shunt resistor with well-known impedance Z like the SHUNT 9570 should be used.

The determination of the magnetic field strength using a sensor loop (field monitor- ing loop) allows also potential isolation without temperature stress. The FESP 5133-7/41 is suitable for this purpose.

HHS 5206-132

Description:

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 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 5206-132 is ideally suited for the calibration of magnetic field probes or sensors. Typical applications are magnet- ic immunity testing according to automo- tive standards or MIL-461F. When gener- ating 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 is usually con- sidered as primary standard due to the easily calculable relation between current and field strength. If this relation should be controlled, a loop sensor or monitoring loop 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 sup- plies, conductors carrying high currents, computer monitors, loudspeakers, cath- ode ray tubes (CRT) and so on. All kinds of magnetic material (e.g. steel, nickel, cobalt) should 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 magnet- ic flux.

The coil terminals are assigned with the characters A, B, C and D. The generator (current source, audio-amplifier...) is con- nected to the terminals A and C, the ter- minals 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 oth- er.

Field strength determination:

There are two methods to determine the actual magnetic field strength:

1. Determination of the coil current

  • Current transformer clamp
  • Measuring the voltage drop across a well known resistor
  • Direct current measurement

2.   Determination of the field strength using a field monitoring loop

The direct current measurement has the dis- advantage 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 (poten- tial 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 meas- ured, it is essential to provide sufficient cooling and potential isolation of mains driven voltme- ters. Using small shunt resistor values causes less heat dissipation may however cause higher measurement uncertainties because the wanted shunt resistance is hardly higher than unwanted contact resistances. Beyond several kHz the inductance of the shunt resistor may become dominant. For that reason a low in- ductive shunt resistor with well known imped- ance Z like the SHUNT 9571 should be used. The determination of the magnetic field strength using a sensor loop (field monitoring loop) allows also potential isolation without temperature stress. The FESP 5133-7/41 is suitable for this purpose.

Свернуть Развернуть
Сведения о реестре СИ
Номер в госреестре
Не в реестре
Наименование СИ

Обозначение типа СИ

Изготовитель

Срок свидетельства или заводской номер

Свернуть Развернуть
Сведения о реестре СИ
Номер в госреестре
Не в реестре
Наименование СИ

Обозначение типа СИ

Изготовитель

Срок свидетельства или заводской номер

Характеристики
HHS 5206-4 - Circular Helmholtz Coils
Number of turns: 4
Maximum Coil Current: 55 A (5 min.)
Nominal Coil Current: 34 A continuous
Coil Spacings (centered): 300 mm
Max. Magn. Field Strength: 530 A/m (5 min.)
Nominal Magn. Field Strength: 330 A/m continuous
Magn. Field Strength, 1 A Coil Current: 9.64 A/m
139.68 dBµA/m
Coil Diameter: 584 mm
Max. Cubical shaped DuT: 32.5 x 32.5 x 32.5 cm
Mechanical Dimensions: 0.64 m x 0.79 m x 0.42 m
Terminals: 4 mm female
Inductance (Single Coil): 24 µH
Inductance (Coil Pair): 52 µH
Usable Frequency Range: DC - 1.5 MHz
Resonance Frequency: > 3 MHz
Weight: 17 kg
HHS 5206-8 - Circular Helmholtz Coils
Number of turns: 8
Maximum Coil Current: 55 A (5 min.)
Nominal Coil Current: 34 A continuous
Coil Spacings (centered): 300 mm
Max. Magn. Field Strength: 1060 A/m (5 min.)
Nominal Magn. Field Strength: 650 A/m continuous
Magn. Field Strength, 1 A Coil Current: 19.23 A/m
145.68 dBµA/m
Coil Diameter: 600 mm
Max. Cubical shaped DuT: 32.5 x 32.5 x 32.5 cm
Mechanical Dimensions: 0.64 m x 0.79 m x 0.42 m
Terminals: 4 mm female
Inductance (Single Coil): 91 µH
Inductance (Coil Pair): 200 µH
Usable Frequency Range: DC - 800 kHz
Resonance Frequency: > 1500 kHz
Weight: 17.0 kg
Recommended accessories: NFCN 9732 85 kHz
HHS 5206-16 - Circular Helmholtz Coils
Number of turns: 16
Maximum Coil Current: 55 A (5 min.)
Nominal Coil Current: 33 A continuous
Coil Spacings (centered): 300 mm
Max. Magn. Field Strength: 2100 A/m (5 min.)
Nominal Magn. Field Strength: 1260 A/m continuous
Magn. Field Strength, 1 A Coil Current: 38.17 A/m
151.63 dBµA/m
Coil Diameter: 600 mm
Max. Cubical shaped DuT: 32.5 x 32.5 x 32.5 cm
Mechanical Dimensions: 0.64 m x 0.79 m x 0.42 m
Terminals: 4 mm female
Inductance (Single Coil): 340 µH
Inductance (Coil Pair): 750 µH
Usable Frequency Range: DC - 500 kHz
Resonance Frequency: > 700 kHz
Weight: 20.4 kg
HHS 5206-25 - Circular Helmholtz Coils
Number of turns: 25
Maximum Coil Current: 46 A (5 min.)
Nominal Coil Current: 28 A continuous
Coil Spacings (centered): 300 mm
Max. Magn. Field Strength: 2700 A/m (5 min.)
Nominal Magn. Field Strength: 1600 A/m continuous
Magn. Field Strength, 1 A Coil Current: 59.64 A/m
155.51 dBµA/m
Coil Diameter: 600 mm
Max. Cubical shaped DuT: 32.5 x 32.5 x 32.5 cm
Mechanical Dimensions: 0.64 m x 0.79 m x 0.42 m
Terminals: 4 mm female
Inductance (Single Coil): 0.81 µH
Inductance (Coil Pair): 1.82 µH
Usable Frequency Range: DC - 300 MHz
Resonance Frequency: > 400 kHz
Weight: 19.4 kg
HHS 5206-132 - Circular Helmholtz Coils
Number of turns: 132
Maximum Coil Current: 15 A (5 min.)
Nominal Coil Current: 10 A continuous
Coil Spacings (centered): 300 mm
Max. Magn. Field Strength: 4713 A/m (5 min.)
Nominal Magn. Field Strength: 3142 A/m continuous
Magn. Field Strength, 1 A Coil Current: 314.2 A/m
169.97 dBµA/m
Coil Diameter: 600 mm
Max. Cubical shaped DuT: 32.5 x 32.5 x 32.5 cm
Mechanical Dimensions: 0.64 m x 0.79 m x 0.42 m
Terminals: 4 mm banana jacks
screw terminals
Inductance (Single Coil): 22.4 mH
Inductance (Coil Pair): 49.9 mH
Usable Frequency Range: DC - 30 kHz
Resonance Frequency: > 50 kHz
Weight: 27.5 kg

Модели и опции
Товар
Модели и Опции
Описание
Цена Заказать
Модели
HHS 5206-4
Круглая катушка Гельмгольца HHS 5206-4, 4 витка
По запросу
- шт +
HHS 5206-8
Круглая катушка Гельмгольца HHS 5206-8, 8 витков
По запросу
- шт +
HHS 5206-16
Круглая катушка Гельмгольца HHS 5206-16, 16 витков
По запросу
- шт +
HHS 5206-25
Круглая катушка Гельмгольца HHS 5206-25, 25 витков
По запросу
- шт +
HHS 5206-132
Круглая катушка Гельмгольца HHS 5206-132, 132 витка
По запросу
- шт +
Библиотека

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