The correct answer is: D. Any of the above.
Vernistats, microsyns, and resolvers are all commonly used as error detectors in instruments.
A vernistat is a device that uses a vernier scale to measure the position of a moving part. It is typically used in instruments that require high accuracy, such as micrometers and calipers.
A microsyn is a device that uses a magnetic field to measure the position of a moving part. It is typically used in instruments that require high speed and accuracy, such as position encoders and tachometers.
A resolver is a device that converts rotary motion into electrical signals. It is typically used in instruments that require high resolution and accuracy, such as gyroscopes and accelerometers.
All three of these devices can be used to detect errors in instruments. For example, a vernistat can be used to detect errors in the position of a micrometer’s slide. A microsyn can be used to detect errors in the speed of a tachometer’s rotor. And a resolver can be used to detect errors in the orientation of a gyroscope’s spin axis.
The choice of which device to use depends on the specific requirements of the instrument. For example, a vernistat may be the best choice for an instrument that requires high accuracy, but a microsyn may be the best choice for an instrument that requires high speed.