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9210D with HVM200 and seat pad accelerometer
9210D with HVM200 and seat pad accelerometer
 
Home > Rental > Human Vibration Calibration: How Portable Shakers Measure Up

Human Vibration Calibration: How Portable Shakers Measure Up

Low Frequency Innovations Make Periodic HVM Testing per ISO 8041 a Reality

Until now most of the testing and calibration requirements within ISO 8041: “Human response to vibration – measuring instrumentation” have been outside the realm of possibility for the Industrial Hygienist. But The Modal Shop Models 9200D and 9210D Low Frequency Portable Vibration Calibrators bring revolutionary field testing capability to the Health & Safety professional, allowing them to meet not only the “in-situ” requirements of ISO 8041 but also mechanical “verification testing” requirements. Larson Davis’ HVM200 and SEN027 seat pad accelerometer make calibration simple by allowing the user to remove the accelerometer from the pad itself rather than apply a bulky, high-transverse adaptor.

There are three levels of calibration requirements within ISO 8041: pattern evaluation, verification testing and in-situ checks:

  • Pattern evaluation is full testing, targeted at human vibration meter and sensor manufacturers. It ensures the meter design meets the ISO standard. This aspect of the standard does not apply to the user.
  • Periodic verification testing is an intermediate set of tests geared toward end users and manufacturers. Per ISO 8041 they should be performed “every 1 or 2 years…to verify that the (instrumentation) performance remains within the specifications.”
  • In-situ checks are specifically targeted at users, encouraging a minimum level of testing before and after measurements are made to ensure quality data.

Available for rental or purchase, Models 9200D and 9210D are the first and only Portable Calibrators to meet – or come close to meeting – several key testing and calibration requirements within ISO 8041. Specific test clauses to which these calibrators can be applied are listed below. To learn more click on each clause to expand and read detailed analysis regarding how The Modal Shop shakers “measure up.”

Verification Testing

  • Clause 13.2: Testing requirements
  • Clause 13.7: Indication at the reference frequency under reference conditions
  • Clause 13.10: Frequency weightings and frequency responses

In-situ Checks

  • Clause 14.3: Vibration sensitivity (field calibration)
  • Annex A: Specification for vibration field calibrator

Other Features & Benefits

Aside from testing human vibration meters, model 9210D is capable of creating ISO 17025 compliant calibration certificates for accelerometers per the ISO 16063-21 standard. No software is required. Technicians simply create the certificate in Microsoft Excel ®, save or print or both. Models 9210D and 9200D offer the following exclusive features:

  • Market-leading adjustable frequency range from 0.7 Hz to 2 kHz
  • Quick toggle between acceleration, velocity and displacement in English or metric units
  • Closed loop control holds acceleration stable as frequency is changed and vice versa
  • Rugged and portable with 14 hour battery life
  • Accelerometer sensitivity display and power for instant confirmation (9210D only)
  • Payload capability of 800 grams