ONOSOKKIHigh performance FFT handheld tachometerFT-7200The FT-7200 high-performance FFT handheld tachometer is a small, easy-to-use, high-performance handheld digital tachometer. The FT-7200 measures the speed of noise, vibration, and magnetic field changes generated by motors and various rotating machinery through FFT (fast Fourier transform) calculations. Even for complex signals from sound level meters or vibration sensors, it can extract frequency components equivalent to the speed and calculate and display the speed. For machines such as motors installed in equipment whose rotating shafts are not exposed, it is difficult to measure them with traditional measurement methods. Using the FT-7200, it is easy to measure noise or vibration. There is no need to stick a reflective marker film on the measurement object or perform additional processing on the rotating shaft. In addition, it can track and calculate and display the speed when the speed changes sharply during the rise/fall of the motor speed or when the engine speed accelerates and decelerates sharply. The FT-7200 uses batteries and is easy to carry and is very convenient for on-site use. According to the purpose of use and needs, there are a wide variety of signal sensors (sold separately) that can be used in combination with the FT-7200, and there are many options. The noise signal is detected by a microphone and preamplifier combination, and a sound level meter. The vibration signal is detected by an acceleration sensor and an engine vibration sensor. The magnetic field signal is detected by a magnetic field line sensor. The engine ignition signal is detected by an ignition pulse sensor. In addition, a cigarette lighter sensor (FT-801) is provided, which obtains the vehicle power supply voltage noise signal generated by the engine ignition through the vehicle power outlet. Measurement object DC motor, compressor, engine, general rotating object Measurement calculation method FFT analysis method Measurement time Within 250 ms Input signal frequency range 2000 Hz Frequency range 30 to 2000 Hz (1,800 to 99,999 r/min) 500 Hz Frequency range 7.5 to 500 Hz (450 to 30,000 r/min) 250 Hz Frequency range 3.75 to 250 Hz (225 to 15,000 r/min) Note: The above is the relationship between the frequency range and the speed under the condition of 1P/R. Measurement unit r/min (speed) Measurement accuracy ±2 × speed resolution (r/min) ±1 count ※ The speed measurement accuracy is related to the frequency range Minimum speed resolution Frequency range (Hz) ÷ 6400 × 60 ÷ set number of pulses (P/R) ※ The resolution of the measured speed value will decrease when accelerating or decelerating. 6400 - 200 line × 32 Filter function Sampling filter is performed according to the set frequency range. The maximum speed is limited to the set frequency range. Averaging processing Moving average method Averaging times: OFF, 2, 4, 8, 16 Sensor sensitivity adjustment The sensitivity of the sensor can be adjusted using the knob on the right side of the unit Engine speed OM-1200/1500, IP-292, IP-296, IP-3000A, IP-3100, FT-0810 Vibration VP-202, VP-1220, NP-2000 series, NP-3000 series Noise MI-1433 (microphone) + MI-3111 (preamplifier) Others Leakage magnetic sensor, LED reflective sensor