IRD811D is a Portable Digital Vibration Meter cum Spike Energy Detector. It is an easy-to-use and read meter with a digital display. It measures machinery vibration amplitude in terms of displacement (microns), velocity (mm/sec) and acceleration (g). It is also able to help assess antifriction bearing condition through measurement of Spike Energy (gSETM). The broadband measurement of gSETM enable detection and measuring of "bursts" of Spike Energy at Ultrasonic frequencies. Bearing defects developing such as micro spalls, cracks and lack of lubrication can be quickly identified thus preventing unscheduled plant outage. From precision bearing inspection to plant-wide maintenance, the IRD811D has the sensitivity for measuring fractions of a micrometer to 2000 microns. Its integrated circuit technology provides wide dynamic range and long battery life. Measurement Display – Auto RangingDisplacement: - 0 - 2,000 microns Pk-PkVelocity: - 0 - 200 mm/sec RMSFrequency RangeDisplacement: - 300 to 60,000 CPM (5 Hz to 1,000 Hz)Velocity: - 300 to 600,000 CPM (5 Hz to 6,000Hz)AccuracyInstrument: - 0.5% of full scale ± 1 countInput / OutputInput: - Piezo Velocity Accelerometer model IRD531Output: - LCD Digital Display (3½ Digit)Power Requirements - Internal Battery Set 2 Nos. 9V, 100mAH Dry CellsEnvironmentalOperating temp: - 0°C to +50°C, Sensor to 140°C.Storage temp: - -18°C to +65°CWeight & DimensionsInstrument Wt.: - 400 gms (meter only)Instrument: - 18mm (L) x 100mm (W) x 40mm (H)