Shock Pulse Measurement on air compressor?
Answer:
SPM The Shock Pulse Meter is a practical instrument to monitor the condition of the rotating ball or roller bearings. Due to the normal surface roughness, the balls or rollers generate shock pulses when they roll in the bearing ring. The shocks are detected by a transducer, making contact with a machined surface close to the loaded zone of the bearing. To eliminate possible errors due to the mispositioning of the transducer, adapters are installed permanently at the measurement points. The transducer is positioned on the adapter by means of a quick-connector. Measuring the shock pulses with a handhold probe gives less accurate results and is not recommended. The signal of the transducer is translated into a dBc(carpet level) and a dBm (maximum level) value. Two types of instruments are available SPM 43 A and T 2000. SPM 43 A - Pre-set the meter at the specified dBi value (with the inner-upper thumb wheel scale) - The shock pulses are translated into an audio signal. Start the measurement with the outer thumb wheel at high dB value. There should be no audio signal. Decrease the dB level with the outer thumb wheel until the first audio signal occurs. This is the dBm value. Decrease the dB level further until a constant audio signal is generated. This is the dBc value. T 2000/T30 - Pre-set the meter at the specified dBi value (using ‘SET’ push button and the up and down arrows). - Pushing on the ‘M’ button, the digital instrument indicates the dBc and dBm value. If the SPM level exceeds the limit at one or more points, a frequency analysis is required to define the problem and the necessary actions.
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