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Taking A Closer Look at Portable Measuring Arm Servicing

romer arms

Portable metrology systems have come a long way in recent years and the technology is only getting better. Probably the most significant advancement in portable arm technology is repeatable mounting which saves the user time and guarantees continued accuracy. These advancements are making portable CMM’s a mainstay for manufacturing businesses across a range of sectors and we’re increasingly getting asked about portable metrology and what applications it’s best suited for.

As with standard bridge CMM’s, portable systems also require a lot of care and attention to ensure continued accuracy. Generally, a 12 month interval for scheduled PCMM maintenance is enough but this depends on use. If your portable equipment is used for many hours every day, and or in a harsh environment then you might want to consider more frequent scheduled maintenance.

Let’s take a closer look at what portable measuring arm servicing should include…


There are several key inspections and tests that should be carried out during portable measuring arm servicing as the first port of call. This includes but isn’t limited to:

  • Overall thorough inspection of the arm
  • Test ALL cables
  • Check TESA kinematic joint connectors (on Hexagon arms)
  • Inspect the feedback LEDs and pictograms
  • Check buttons function correctly
  • Test ALL accessories and artefacts


After the initial inspection and tests have been carried out, a full performance check needs to be undertaken (where applicable). During this, your service provider will confirm that the machine performs to the required specifications. The counterbalance will also undergo a compliance check.

Alignment, Calibration, Certification and Software

Alignment is the first step here. Your arms probes will be aligned so that tests and calibrations can then be performed. The tests and calibrations should make sure the machine fulfils the four accuracy values that are specified in ISO 10360. These include the length test (Euni), sphere test one (Ldia), sphere test two (Ldia) and sphere test 3 (Pform).

Each of the tests ensures the arm is within the maximum permissible error that’s specified for various measurements. The first test looks at unidirectional length, test two looks at articulation location, the third ensures it doesn’t exceed the mpe for measuring spherical diameters and the final test is for measuring the form of a sphere.

Once all of this has been complete, new certifications should be provided by your service provider if needed. Finally, firmware and software will need to be updated.

Following the service, the inside of the arm and all cases, cables, artefacts and accessories should ideally be fully cleaned.

Take A Closer Look

If you’re using a portable measuring arm and need a new service partner then get in touch with Status today. Our fully-trained service engineers will go above and beyond to carry out the highest-quality PCMM servicing to help avoid the need for costly repairs.

Email us at, call us on 0115 939 2228 or complete your details on our enquiry form.