Серия перестраиваемых конденсаторов 0,05 пФ - 1150 пФ, 0.01% + 0.0001 пФ

1422
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Магазины емкости 1422 Подробнее






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Основные возможности и технические характеристики
The GenRad 1422 is a ultra stable and precise variable primary air capacitor intended for use as a continuously adjustable standard of capacitance. One of the most important applications for the 1422 is in ac bridge measurements, either as a built-in standard or as an external standard for substitution measurements.

The 1422 is available in a variety of ranges, terminal configurations, and scale arrangements to permit selection of precisely the required characteristics.

Two-Terminal The 1422-D is a dual range 115 pF and 1150 pF, two-terminal capacitor, direct reading in total capacitance at either range terminal to ground. For convenience in making substitution measurements, the 1422-MD and 1422-ME are also dual-range two-terminal capacitors, with scales reading in capacitance removed. Two-terminal GenRad 1422-D, 1422-N, 1422-ME, 1422-MD capacitors are terminated in binding posts.

Three-terminal The GenRad 1422-CB, -CL, and -CD are three terminal capacitors with shielded coaxial terminals via GR-874, for use in three-terminal measurements. The calibrated direct capacitance is independent of terminal capacitance to ground, and losses are very low. The 1422-CL has particularly low, constant terminal capacitance, making it suitable for measurement circuits in which high capacitance to guard cannot be tolerated.The 1422-CD is a dual-range 1.1 pF and 11 pF, three-terminal capacitor with direct reading in total capacitance at either range terminal to low.

Construction The capacitor assembly is mounted in a cast frame for rigidity. This frame and other critical parts are made of aluminum alloys selected to give the strength of brass with the lightness of aluminum. The plates of most models are also aluminum, so that all parts have the same temperature coefficient of linear expansion.  A worm drive is used to obtain high precision of setting. To avoid eccentricity, the shaft and the worm are accurately machined as one piece. The worm and worm wheel are also lapped into each other to improve smoothness. The dial end of the worm shaft runs in a self-aligning ball bearing, while the other end is supported by an adjustable spring mounting, which gives positive longitudinal anchoring to the worm shaft through the use of a pair of sealed, self-lubricating, preloaded ball bearings. Similar pairs of preloaded ball bearings provide positive and invariant axial location for the main or rotor shaft. Electrical connection to the rotor is made by means of a silver-alloy brush bearing on a silver-overlay drum to assure a low-noise electrical contact.
Stator insulation in all models is a cross-linked thermosetting modified polystyrene having low dielectric losses and very high insulation resistance. Rotor insulation, where used (GenRad 1422-CB and -CL), is grade L-4 steatite, silicone treated.

Accuracy The errors tabulated in the specifications are possible errors, i.e., the sum of error contributions from setting, adjustment, calibration, interpolation, and
standards. When the capacitor is in its normal position with the panel horizontal, the actual errors are almost always smaller. The accuracy is improved when the readings are corrected using the 12 calibrated values of capacitance given on the correction chart on the capacitor panel and interpolating linearly between calibrated points. Even better accuracy can be obtained from a precision calibration of approximately 100 points on the capacitor dial, which permits correction for slight residual eccentricities of the worm drive and requires interpolation over only short intervals. This precision calibration is available for all models at an extra charge. A plastic-enclosed certificate of calibration is supplied, giving corrections to one more figure than the tabulated accuracy.

  • Range as low as 0.002 pF and as high as 1150 pF (Depending on Model)
  • Variable air capacitors
  • Stability: better than 0.02% full scale per year
  • Settable to 40 ppm
  • Low temperature coefficient, low losses
  • Wide selection of 7 models to suit low capacitance needs

  • Свернуть Развернуть
    Основные возможности и технические характеристики
    The GenRad 1422 is a ultra stable and precise variable primary air capacitor intended for use as a continuously adjustable standard of capacitance. One of the most important applications for the 1422 is in ac bridge measurements, either as a built-in standard or as an external standard for substitution measurements.

    The 1422 is available in a variety of ranges, terminal configurations, and scale arrangements to permit selection of precisely the required characteristics.

    Two-Terminal The 1422-D is a dual range 115 pF and 1150 pF, two-terminal capacitor, direct reading in total capacitance at either range terminal to ground. For convenience in making substitution measurements, the 1422-MD and 1422-ME are also dual-range two-terminal capacitors, with scales reading in capacitance removed. Two-terminal GenRad 1422-D, 1422-N, 1422-ME, 1422-MD capacitors are terminated in binding posts.

    Three-terminal The GenRad 1422-CB, -CL, and -CD are three terminal capacitors with shielded coaxial terminals via GR-874, for use in three-terminal measurements. The calibrated direct capacitance is independent of terminal capacitance to ground, and losses are very low. The 1422-CL has particularly low, constant terminal capacitance, making it suitable for measurement circuits in which high capacitance to guard cannot be tolerated.The 1422-CD is a dual-range 1.1 pF and 11 pF, three-terminal capacitor with direct reading in total capacitance at either range terminal to low.

    Construction The capacitor assembly is mounted in a cast frame for rigidity. This frame and other critical parts are made of aluminum alloys selected to give the strength of brass with the lightness of aluminum. The plates of most models are also aluminum, so that all parts have the same temperature coefficient of linear expansion.  A worm drive is used to obtain high precision of setting. To avoid eccentricity, the shaft and the worm are accurately machined as one piece. The worm and worm wheel are also lapped into each other to improve smoothness. The dial end of the worm shaft runs in a self-aligning ball bearing, while the other end is supported by an adjustable spring mounting, which gives positive longitudinal anchoring to the worm shaft through the use of a pair of sealed, self-lubricating, preloaded ball bearings. Similar pairs of preloaded ball bearings provide positive and invariant axial location for the main or rotor shaft. Electrical connection to the rotor is made by means of a silver-alloy brush bearing on a silver-overlay drum to assure a low-noise electrical contact.
    Stator insulation in all models is a cross-linked thermosetting modified polystyrene having low dielectric losses and very high insulation resistance. Rotor insulation, where used (GenRad 1422-CB and -CL), is grade L-4 steatite, silicone treated.

    Accuracy The errors tabulated in the specifications are possible errors, i.e., the sum of error contributions from setting, adjustment, calibration, interpolation, and
    standards. When the capacitor is in its normal position with the panel horizontal, the actual errors are almost always smaller. The accuracy is improved when the readings are corrected using the 12 calibrated values of capacitance given on the correction chart on the capacitor panel and interpolating linearly between calibrated points. Even better accuracy can be obtained from a precision calibration of approximately 100 points on the capacitor dial, which permits correction for slight residual eccentricities of the worm drive and requires interpolation over only short intervals. This precision calibration is available for all models at an extra charge. A plastic-enclosed certificate of calibration is supplied, giving corrections to one more figure than the tabulated accuracy.

  • Range as low as 0.002 pF and as high as 1150 pF (Depending on Model)
  • Variable air capacitors
  • Stability: better than 0.02% full scale per year
  • Settable to 40 ppm
  • Low temperature coefficient, low losses
  • Wide selection of 7 models to suit low capacitance needs

  • Комплектацию Вы можете узнать:
    По тел.: +7 (495) 105 96 88 или
    Написать нам письмо: info@micro-electronics.ru
    Комплектацию Вы можете узнать:
    По тел.: +7 (495) 105 96 88 или
    Написать нам письмо: info@micro-electronics.ru
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    Характеристики
    Загрузить технические характеристики

    1422 Variable Air Capacitor Basic Specifications

    (See Datasheet for Full Specifications)

    Stability: Capacitance change with time <1 scale division (0.02% of full scale) per year. Long-term accuracy can be estimated from the stability and the initial accuracy.

    Calibration: Measured values (supplied) are obtained by comparison at 1 kHz, with working standards whose absolute values are known to an accuracy of (0.01% + 0.0001 pF). Each comparison is made to a precision better than 0.01%.

    Range

       

    1422-D

    1422-CB

    1422-CL

    1422-CD

    CAPACITANCE  Min  100 35 50 10 0.5 0.05
    RANGE, pF  Max  1150 115 1100 110 11 1.1
    SCALE, pF/Division:    0.2 0.02 0.2 0.02 0.002 0.0002
    Модели и опции
    Товар
    Модели и Опции
    Описание
    Цена Заказать
    Модели
    1422-D
    Перестраиваемые конденсаторы 35 - 1150 пФ
    По запросу
    - шт +
    1422-CB
    Перестраиваемые конденсаторы 50 - 1100 пФ
    По запросу
    - шт +
    1422-CL
    Перестраиваемые конденсаторы 10 - 110 пФ
    По запросу
    - шт +
    1422-CD
    Перестраиваемые конденсаторы 0,05 - 11пФ
    По запросу
    - шт +
    Ordering information
    1422-9704
    1422-D Precision Capacitor 12 points
    По запросу
    - шт +
    1422-9916
    1422-CB Precision Capacitor 12 points
    По запросу
    - шт +
    1422-9933
    1422-CD Precision Capacitor 12 points
    По запросу
    - шт +
    1422-9508
    1422-CLP Precision Capacitor ~100
    По запросу
    - шт +
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    PEIGHTAL55
    29 октября 2021
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