There are two main dynamic indicators of the instrument:
(1) Response time It refers to the time from when the sensing element of the star measuring instrument accepts the change of the measured parameter until the pointer basically indicates the change of the measured parameter. This period of time is called the instrument's response time.
Instrument response time can be used to describe the magnitude of the measuring instrument lag. Obviously, the response time of the measuring instrument is short, and the lag is small. However, the response time of the instrument should be adapted to the period of change of the measured parameter.
Whether the measuring instrument can reflect the change of the measured parameter in time is an important dynamic quality index. If the meter takes a long time to get the correct indication of the measured parameter, then the meter must not be used to measure frequently changing parameters. Because the meter has not yet indicated the value of the parameter, the parameter has changed again, so the meter cannot always indicate the true change of the parameter. Generally, the response time of the instrument is less than the change period of the measured parameter.
(2) The time for the instrument pointer to travel the full stroke. It refers to the time required for the instrument pointer to move from the lower scale limit to the upper scale limit, or from the upper scale scale to the lower scale limit when the full scale signal value (step signal) is input to the instrument .