Shock - CS18

Product overview

  • Primary calibration of shock transducers as well as complete measuring instruments (measuring chain) with very high precision and efficiency, according to ISO 16063-13
CS18P MS
Hopkinson-Bar Calibration System

CS18P MS

  • Primary calibration of shock transducers as well as complete measuring instruments (measuring chain) with very high precision and efficiency, according to ISO 16063-13

Product Details:

  • Amplitude range up to 50,000 m/s²
  • Sensor mass (DUT) up to 30 gram
  • Primary calibration of shock transducers according to ISO 16063-13
  • Primary calibration of shock accelerometer reference standards
  • Realization of fully automated calibrations according to own test regime

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  • Primary calibration of shock sensor transducers as well as complete measuring instruments (measuring chain) with very high precision and efficiency, according to ISO 16063-13
CS18P HS
Hopkinson-Bar Calibration System

CS18P HS

  • Primary calibration of shock sensor transducers as well as complete measuring instruments (measuring chain) with very high precision and efficiency, according to ISO 16063-13

Product Details:

  • Amplitude range up to 750,000 m/s2
  • Sensor mass up to 30 gram
  • Primary calibration of shock sensor transducers according to ISO 16063-13
  • Primary calibration of shock accelerometer reference standards
  • Realization of all automatic calibrations according to own test regime

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  • Secondary calibration of shock transducers as well as complete measuring instruments in form of a measuring chain, with very high precision and efficiency, according to ISO 16063-22 (calibration by the comparison method)
CS18 (V)HS
Hopkinson-Bar Calibration System

CS18 (V)HS

  • Secondary calibration of shock transducers as well as complete measuring instruments in form of a measuring chain, with very high precision and efficiency, according to ISO 16063-22 (calibration by the comparison method)

Product Details:

  • Hopkinson-bar shock exciter
  • full sine type of shock excitation
  • 50.000 m/s² … 2.000.000 m/s²
  • all automatic/ semi automatic operation
  • shock duration up to 40 µs
  • e.g. calibration of shock transducers or measuring chains

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  • Secondary calibration of shock-sensors as well as complete measuring instruments in form of a measuring chain, with very high precision and efficiency, according to ISO 16063-22 (calibration by the comparison method)
CS18 LMS
Pneumatic Shock Calibration System

CS18 LMS

  • Secondary calibration of shock-sensors as well as complete measuring instruments in form of a measuring chain, with very high precision and efficiency, according to ISO 16063-22 (calibration by the comparison method)

Product Details:

  • Half sine shock excitation
  • Amplitude range 50 m/s² … 100.000 m/s²
  • All automatic / semi automatic operation
  • shock duration lower than 0,1 ms ... 5 ms
  • e.g. calibration of shock transducers or measuring chains

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  • Secondary calibration of shock-sensors as well as complete measuring instruments in form of a measuring chain, with very high precision and efficiency, according to ISO 16063-22
CS18 LS
Shock-Pendulum Calibration System

CS18 LS

  • Secondary calibration of shock-sensors as well as complete measuring instruments in form of a measuring chain, with very high precision and efficiency, according to ISO 16063-22

Product Details:

  • pendulum exciter
  • half sine shock excitation
  • 100 m/s² … 2.000 m/s²
  • manual operation
  • shock duration 1 ms ... 10 ms
  • e.g. calibration of shock transducers or measuring chains

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  • Secondary calibration of shock transducers as well as complete measuring instruments (measuring chain) with very high precision and efficiency, according to ISO 16063-22 (calibration by the comparison method)
CS18 MS
Hopkinson-Bar Calibration System

CS18 MS

  • Secondary calibration of shock transducers as well as complete measuring instruments (measuring chain) with very high precision and efficiency, according to ISO 16063-22 (calibration by the comparison method)

Product Details:

  • Hopkinson-bar with Piezo-Actuator (Patent)
  • adjustable excitation (Ishock duration and amplitude can be controlled independently)
  • 200 m/s² … 40.000 m/s²
  • shock duration 40 µs ... 360 µs
  • all automatic / semi automatic operation
  • e.g. calibration of shock transducers or measuring chains

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Interesting facts

Working Range Shock Exciter
Working Range Shock Exciter
How do I find an appropriate shock calibration system?

Shock calibration systems differ on one hand, with respect to the amplitude range of the shock exciter and on the other hand on the duration of shocks. Both parameters must match the technical parameters of the samples to be calibrated.

 

Shock amplitude

One goal of shock calibrations usually is to check the amplitude linearity of the specimen. Therefore, the shock exciter should cover most of the specified amplitude range as provided in the datasheet. The following maximum shock amplitudes can be achieved with various shock exciters:

 

  1. Shock pendulum 2 km/s2 (200 gn)
  2. Pneumatic Shock Exciter 100 km/s2 (10,000 gn) (experimentally up to 150 km/s2)
  3. Hopkinson-bar Exciter 2,000 km/s2 (200.000 gn) (experimentally up to 5,000 km/s2 or more)

 

Shock duration

In addition to the shock amplitude, the width or length of the shocks need to be examined and suited to each device to be tested. For crash tests in the automotive industry, for example, the signal of many sensors is limited to a few kHz. A cutoff frequency of 1 kHz corresponds approximately to a shock with a duration of 1 ms. Therefore, for calibration, a shock exciter should be used that allows shocks of a few milliseconds, otherwise sensor sensitivity would be too low in the damped area. Undamped sensors, however, can be damaged by shocks that are too short because they may cause resonances in the sensor element. Typical shock durations of various exciters are:

 

  1. Shock pendulum 1 ms ... 8 ms
  2. Pneumatic Shock Exciter < 0,1 ms ... 5 ms
  3. Hopkinson-bar Exciter < 40 µs

 

Functional principles of various shock exciters

SPEKTRA manufactures a wide-ranging family of different shock exciters that are based on two working principles:

 

  1. Hopkinson-bar Shock Exciter
  2. Hammer-Anvil Shock Exciter

 

Hammer-Anvil Exciter

These include the manually operated shock pendulum SE-210 SP-LS (low shock) and the automated pneumatic shock exciter SE-201 PN-LMS (low medium shock). A hammer or projectile is accelerated by gravity or compressed air and hits an anvil on which the specimen and possibly the reference sensor is attached. A so-called mitigator - made of an elastic material - is positioned at the interface between the hammer and anvil and provides the pulse shaping.

 

Hammer-anvil exciters produce roughly a half-sine acceleration pulse of 50...100,000 m/. The pulse width depends on the acceleration and mitigator and is 0.1...5 ms. The used reference is usually a Back to Back accelerometer.

 

Hopkinson-bar Shock Exciter

These include the medium Shock Exciter SE-221 HOP-MS with a piezoelectric exciter and the pneumatically operated high and very high Shock Systems SE 221. At one end of the Hopkinson bar (a titanium rod of 2 m length), an acceleration pulse is initiated by a projectile or piezo transducer. The bar shapes the pulse and provides, among other things, low transverse acceleration and no reflection within a given period. At the other end of the bar the device under test is attached. The Hopkinson bar produces a full sine pulse. References can be: Back to Back accelerometers, strain gauges, laser vibrometer.