### INDEX

#### V

- Velocity Pickup
- Sensor which generates an output (generally, electrical output) proportional to the input speed.
- Velocity Transducer
- Measures velocity in millimeter per second. Usually IEPE (Integrated electronics Piezoelectric) type or moving coil type.
- Vibration Proof
- Synonym for resistance against vibration.
- Vibration Vector
- Vibration signal expressed with a phase angle with respect to the reference (e.g. keyway) on a rotor and also with vibration amplitude.
- Vibrometer
- Measuring instrument capable of indicating the size of vibration expressed by the peak value, rms value, etc. on the scale.

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#### W

- Waterproof Construction
- Construction of equipment or system installed outdoors without a cover which protects it from the effects of wind and rain.

There are the following types of water-proofing:

Water-proof types: Drip-proof, Rain-proof, Splash-proof, Water injection-proof, Water-proof, Water immersion-proof, Water dipping-proof and Humidity-proof.

Note: For the definition of each water-proof term, see JIS C0920.
- Wave Length
- Distance a wave travels in one cycle.
- Whirling
- Turning motion of the shaft center line.
- Withstand Voltage (Electric Strength)
- Voltage which the insulation of electrical equipment can withstand over a fixed period.

Example: 1 minute at a withstand voltage of 1000VAC (between each power terminal and the grounding terminal)

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#### X

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#### Y

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#### Z

- Zero Adjustment
- Synonym for zero-point adjustment.
- Zero-point Adjustment
- To adjust the zero point of the equipment to a specified value or position by an electrical or mechanical operation.
- Zero Shift
- Parallel changes of input/output characteristic curves.

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##### Reference

- Terms for measurement:
- JIS Z8103
- Terms for performance of industrial instruments:
- Japan Electrical Measuring Instrument

Industry Association
- Vibration Engineering Handbook:
- Yoken-Do
- Terms for electronic measuring instrument:
- Japan Electrical Measuring Instrument

Industry Association

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