There are five ways to verify the functionality of the ST5484E (4-20 mA) output

1) Zero Vibration

When there is no vibration present the output should be approximately 4 mA. Note that vibration from nearby machinery may influence this measurement. To test to specification
the transmitter should be removed from the machine and placed on a vibration free surface (i.e. a piece of foam). In this case the output should read 4 mA ± 0.1 mA

2) Gentle Shake

Remove the ST5484E from the machine and shake it gently in your hand. You should be able to see the output change. Gentle shaking of the ST5484E will easily give you a 12-20 mA output. This method (of course) is not for validating to specifications, but it can give you confidence that the sensor is working.

3) Comparison Measurement

Using a handheld vibration meter, you can compare the measured vibration to the output to the ST5484E. For example, if I measure 0.15 in/s pk using a vibration meter and my ST5484E range is 0-1 in/s pk, then my measured vibration is 15% of ST5484E full scale range (reading on meter/ ST5484E full scale range) or (0.15 ips / 1.0 ips). Next calculate 15% of the 4-20 mA range. The full range is 16 mA (starting at 4 mA). 16 mA * 15% = 2.4mA. Since my zero is 4mA I must add them together (4 mA + 2.4 mA = 6.4 mA). The comparison measurement is to increase confidence that the sensor is working. It cannot be used to verify that the sensor is within specifications. When using a comparison measurement allow a tolerance of at least ± 20%.

4) Shaker Table

Use a shaker table to subject the ST5484E to a known vibration. Metrix sells shaker tables for this purpose. This is the only way to verify that the sensor is performing to specification.

5) Send to Metrix

You can send the ST5484E to Metrix for certification. Note that there are no Zero and Span adjustments on the transmitter. The testing performed at Metrix is simply to certify that the sensor is still within specifications. Metrix will use a shaker table to subject the ST5484E to a known vibration and report the results.

Return For Calibration (or Certification) (Link)
Use this link to receive a Return Material Authorization (RMA) number and return material for re-calibration (or certification). You must create a login and fill out a short form, but it only takes a minute. You will need the serial number of the device. After you submit the form, the Warranty team will provide instructions for shipping and the cost for the requested service.