Oscillation circuit, oscillator, manufacturing method of oscillator, electronic device, and moving object

A manufacturing method of an oscillator, comprising:

• preparing a configuration including an oscillation circuit including an oscillation unit that includes a first terminal and a second terminal connected to a resonator, a third terminal, a fourth terminal to which a power supply potential is applied, a first switching unit that switches modes of electrical connection between the first terminal and the third terminal, a second switching unit that switches modes of electrical connection between the second terminal and the fourth terminal, a control unit that controls the first switching unit and the second switching unit in a first mode and a second mode, and the resonator, in which the oscillation unit and the resonator are electrically connected to each other, wherein, in the first mode, the first switching unit is switched so as to electrically connect the first terminal and the third terminal to each other and the second switching unit is switched so as to electrically connect the second terminal and the fourth terminal to each other;
• applying an AC voltage to the third terminal and the fourth terminal;
• and
• switching, by the control unit, from the first mode to the second mode, wherein in the second mode, the first switching unit electrically disconnects the first terminal and the third terminal, and the second switching unit electrically disconnects the second terminal and the fourth terminal, wherein:
• the first mode is an inspection mode having an irregular oscillation,
• the second mode is a non-inspection mode having a regular oscillation, and
• the control unit switches the mode from the second mode to the first mode, based on a clock signal input in a period in which the supplied power supply potential is equal to or greater than a reference value.