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Why don't precision instruments use switching power supply?
The reasons why switching power supply is not needed for precision instruments are as follows:

1, switching power supply can't be used as signal source, otherwise the signal output by precision instruments will produce errors.

2. The switching power supply can't provide a regulated power supply for precision instruments, because the switching power supply is a pulsating power supply, and the voltage will change with the pulse, so it can't maintain the stability of the voltage, so it is not suitable for being used as a regulated power supply.

3, switching power supply will release electromagnetic waves, will interfere with the surrounding electronic equipment and signals, so it is not suitable for precision instruments.