Holt Model HCS-1
Primary Shunt Set

...for the measurement of alternating current amplitude


  • 5 MA to 26 AMP  5 Hz to 50 KHz
  • AC-DC difference = 0.02% max
  • Used as AC-DC transfer devices on a 1-1 basis
  • No ratio calculation
  • Designed for use with either thermal transfer voltmeters or true RMS DVM's
  • Stable precise current standards

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    		•  This Primary Alternating Current Shunt Set consists of seven separate shunt modules, designed to plug directly into either the Holt Model 6B, any Thermal Transfer Voltmeter or true RMS Digital Voltmeter. Each Shunt is a four-terminal resistor providing optimum frequency response well beyond the audio region. Controlled thermal characteristics ensure stable current measurements up to 26 amperes and advanced techniques are employed to minimize inductance and skin effects. Each module is attractively finished in dull black and individually serial numbered for ease of traceability.

    An optional Shunt Transfer Unit is available with the HCS-1 Current Shunt Set allowing convenient interconnection of the Shunt with the associated AC-DC current sources. This dependable, low resistance, coaxial switch unit permits rapid transfer between sources and provides loading for the unused source in either position.

    A rugged formica carrying case is included with each HCS-1 Shunt Set for convenient, dust-free module storage and transportation. The Model HCS-1 provides primary alternating current measurement capability with NIST traceability.

    See below for the technical specifications of the HCS-1.

    MODEL HCS-1 Primary Shunt Set
    TECHNICAL SPECIFICATIONS

    APPLICATIONS:

    Any alternating current level is precisely determined by equating it to the direct current required to produce the same voltage drop across the HCS-1 Shunt. The DC is accurately measured by use of a DC Shunt, potentiometer and standard cells. Each of the two sources must be extremely stable and capable of the required voltage burdens at rated current. Transfers are accomplished on a direct 1 for 1 current basis. The measurement accuracy is not a function of the absolute resistance of the Shunt. The absolute AC accuracy is a function of the AC-DC difference of the Shunt, the accuracy of the AC/DC voltage comparison, and the accuracy with which the DC current can be referenced to a standard cell voltage.

    Click icon on left to see an illustration showing a typical current measurement circuit employing the HCS-1.


    SPECIFICATIONS:

    Current Ranges10,25, 50, 100, and 250 milliamps, each switch selected in one module. Additional individual modules at 500 milliamps, and 1, 2, 5, 10, and 20 amperes. Each module may be used for 50% to 130% of rated current.Frequency CharacteristicsThe maximum AC/DC difference at any frequency from 5 Hz to 50 Khz will not exceed 0.02%.
    Four terminal input admittance
    1MHO/Ampere +/- 1%
    Option a: 1 MHO/Ampere +/- 0.1%.
    Dimensions17 5/8" W x 12 3/8" H x 4 3/4" DAccessoriesCurrent transfer switches. Ask for technical bulletin.
    WeightCarrying case with 7 modules: 16.5 lbs.
    Approximate shipping weight: 35 lbs.


    Specifications subject to change without notice.

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