Cone paper Fo measuring instrument OST-727 Onsoku

Model OST-727 is a measuring instrument which measures displacement of a cone paper excited by a drive speaker with a displacement sensor, and sets frequency at the displacement peak value to Fo according to direct method. This equipment judges a cone paper to be pass or no pass about Fo frequency by setting of an upper – lower allowance.

Product specifications:

Frequency Range
10Hz to 10000Hz
Frequency Resolution
2048 points of logarithm(between start frequency and stop frequency)
Accuracy of Frequency
Within 0.1%
Distortion
Within 3%
Output Voltage
0.100 V～4.000 V (0.001V step).
Constant voltage drive (impedance of the drive speaker 4Ω or more)
Output Voltage Accuracy
±(3%+0.02 V)
Sweep Frequency Range
±2 times of the allowance or manual setting
Sensor Input
3.5VACrms
Sensor Input Range
Sensor Input range is set to any among 3 ranges (1 time, 5 times and 25 times) automatically.
Sensor Locative-calls Voltage
±5 VDC
Measuring Time
Approx. 4s
Measurement Accuracy
±(3%+1 Hz) at Q = 1.6 or more
Measurement Result Output
Serial number, Fo (measured value), Judgment (Go, Lo, Hi)
Judgment Allowance Setup
Centering Frequency 10 Hz～10000 Hz (0.1Hz step)
Upper and Lower Limit Allowance Setup
±1 Hz～20000 Hz (0.1 Hz step)