To provide a technology which can shorten the time needed for measurement for an instrument and a method for frequency measurement, which measure the oscillation frequencies of crystal oscillators in a liquid.
Using this frequency measuring method, the crystal oscillators 61 to 64 are oscillated intermittently but are not oscillated continuously. Consequently, the crystal oscillators are oscillated with a small vibration energy, and the time needed before the oscillation frequencies of the crystal oscillators 61 to 64 become stable in liquid become shorter than that, when the crystal oscillators are continuously oscillated. Further, two or more of the crystal oscillators 61 to 64 are not made to oscillate at the same time, so two or more of the crystal oscillators will not oscillate at the same time, to interfere with each other and measurements can be take without lowering the stability of the oscillation frequencies due to interference.
NAKAMURA SHIZUO
MAEHIRA KEN
FUWA KO
YUYAMA JUNPEI
