How to do calibration checks of vibration Probe, extension cable and vibration monitor

Calibration checks of vibration Probe, extension cable and vibration monitor


Calibration Procedure:

1. Physical check of vibration probe and extension cable for any damages, if it is please replaced with same one.

2. Check resistance of vibration probe and continuity of extension cable it should be 5 to 9Ω and 5 to 20 Ω

3. Use below equation and get reading for calibration of vibration probe.

4. Connect test equipment.

5. Adjust the spindle micrometer on the TK-3 test and calibration kit shown 0.51 mm (20 mils) (0.0254mm=1mils).

6. Insert the probe in to the TK-3 probe holder adjust the probe in the holder until the digital multimeter shows -3.00 ±0.10 VDC.

7. Adjust the micrometer to 0.20mm (8 mils) indication and the back it out again to the 0.25mm (10 mils) indication backless in the micrometer forced the o/p voltage and record it.

8. Increase the gap in 0.25 (10mils) increment by adjusting the micrometer record the voltage indication at each increment.

9. For each gap increment subtract the voltage at the high gap from the voltage at the low gap divide the result by in a system incremental scale factor of 7.87 ±0.79 v/mm (200 mv ±20 mv/mils).

10. Subtract the 0.25 mm (10 mils) voltage (-5 vdc) from the 2.28 mm (90 mils) (11 vdc) and divided by 2.03mm (80 mils). The result should ina system average scale factor (ASF) of 7.87 ±0.43 v/mm (200 mv ±11 mv/mils).

Author: D.Chakraborty

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19 thoughts on “How to do calibration checks of vibration Probe, extension cable and vibration monitor”

  1. buddy, you have explained everything with such a simplicity that even a guy who is not from this field can understand. i really enjoyed reading all your articles also i had recommended this site to my friends who are new in instrumentation and have lots of queries about working of instrumentation. thanks for putting lots of effort. god bless you

  2. sir, can you please explain wouplater in tk3 with probe calibration. as you said the supply voltage is -24vdc,whether the output also will be in negative voltage please reply

    • It can be set same as radial probe with the electrical voltage gap -8 VDC to -12VDC. But first you make sure that the notch/ grove on shaft should not in front of probe tip.

  3. Sir I m u r fan,one question. In para 3 u tell adjust 3v for 20mile & para 10, 5 v for 10mile how.voltage less than 3v.plese explain.thanks

  4. Sir
    If during loop checking how can I calculated. I can measure out value of transducer in MVac. How can I calculated or concert this MVac to mils what formula we can use. So kindly request you please explain my doubts…

    Tinu Mathew

  5. why the output of the average scale factor is 7.87v/mm.. why not above or below… is that any calculation behind the value..?

  6. Standard 9 meter
    7.87 V/mm (200 mV/mil) ± 6.5%
    including interchangeability error
    when measured in increments of
    0.25 mm (10 mils) over the 80 mil
    linear range from 0 °C to +45 °C
    (+32 °F to +113 °F).


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