ONOSOKKIDiesel engine tachometerGE-2500The GE-2500 diesel engine tachometer is a tachometer that uses a new measurement method. It uses the proportional relationship between the engine speed and the alternator speed associated with the engine to derive the engine speed by measuring the alternator speed. A dedicated small sensor OM-1500 has been newly developed for measuring the alternator speed. The OM-1500 measures the engine speed by measuring the change in the leakage magnetic state of the alternator and connecting it to the GE-2500. (OM-1200 can also be used) A tachometer that can reliably measure the speed of various types of diesel engines and gasoline engines Since the engine speed is derived by measuring the generator speed, the number of cylinders in the engine has no effect on the measurement. A tachometer that can reliably measure the speed of various types of diesel engines and gasoline engines Since the generator and engine speed ratio is required, the generator and engine speed ratio must be obtained through calibration processing before measurement. The sensor is easy to set up. The measurement object can also be measured while driving. The FFT calculation method can measure even weak signals. It has excellent noise resistance and can measure stably and reliably. Measurement section Measurement object Diesel engine, gasoline engine (excluding engines without a generator) Processing method FFT analysis method Input signal frequency range 1 kHz, 2 kHz, 5 kHz (measurement mode MAIN) / 500 Hz (calibration mode REF) Measurement accuracy ±2 × Speed resolution (r/min) ± 1 count Speed resolution Frequency range (Hz) ÷ 12800 × 60 ÷ Speed ratio Display section Display Fluorescent tube type Display update cycle 0.2, 0.5, 1, 2 (s) Display resolution 1 r/min, 1 Hz Measurement display range 20,000 r/min Input section Signal input 2 channels, MAIN (for measurement), REF (for calibration) Input voltage range ±5 V, ±0.5 V, ±0.05 V Signal connector BNC Signal coupling AC coupling Constant current drive power supply 2.2 to 3.2 mA (REF channel only)