USER MANUAL Heavy Duty Vibration Meter Model 407860 Additional User Manual Translations available at www.extech.
Introduction Congratulations on your purchase of the Extech 407860 Vibration Meter. The Model 407860 measures vibration levels in industrial machinery. Misalignment, poor balancing, structural compromises, and other factors can cause unwanted vibration increases. The Model 407860 has a frequency sensitivity that meets ISO-2954 and offers Displacement, Velocity and Acceleration features. This meter is shipped fully tested and calibrated and, with proper use, will provide years of reliable service.
Meter Operation Connecting the Probe 1. Note that this meter accepts only the supplied vibration probe. 2. Plug the BNC connector end of the probe cable onto the BNC connector at the top of the meter. 3. The probe can then be connected to the tested machinery in three ways. a. Attach the magnetic end of the probe to a ferrous material on the equipment under test as shown in the accompanying diagram. b. Manually hold the probe in place against the equipment under test as shown. c.
UNIT button Press this button to select the measurement units desired. Press and hold this button for > 5 seconds to switch from metric to imperial units. Measurement Metric Units Imperial Units Acceleration m/s2, G Ft/s2 Velocity mm/s, cm/s Inch/s Displacement mm inch HOLD button Press this button to freeze the measured value in the display. HOLD will appear in the display. Press the button again to return to normal operation.
Datalogging The internal datalogger memory can hold up to 500 readings. Readings can be logged manually, with a button press, or automatically at a programmed sample rate. Sample Rate The sample rate can be set to 0 (manual), 1, 2, 5, 10, 30, 60, 600, 1800 or 3600 seconds. 1. With the meter OFF, Press and hold the HOLD and REC buttons. 2. Press the POWER button. 3. When the display shows the sample rate, release the HOLD & REC buttons. 4. Use the UNIT button to select the desired sample rate. 5.
Memory Full Indication The meter produces a continuous tone when the internal memory has been filled to capacity (500 readings). The data can be viewed, cleared, or downloaded to a PC. Viewing Stored Data 1. With the meter OFF, Press and hold the HOLD and REC buttons. 2. Press the POWER button. 3. When the display indicates the existing sample rate, release the HOLD and REC buttons. 4. The HOLD and the FUNCTION buttons are used to scroll through the stored data.
Battery Replacement When the 9V battery weakens, the replace the battery: indicator appears on the LCD. Follow these steps to 1. Turn the meter OFF. 2. Remove the probe and the RS-232 cable from the meter. 3. Remove the protective rubber jacket that encases the meter by stretching it over the bottom of the meter. 4. Open the battery compartment (located on the lower back of the meter) with a flat head screwdriver or coin. 5.
Specifications General Specifications Display 3-1/2 digit LCD with bargraph Frequency range 10Hz to 1KHz (frequency sensitivity meets ISO-2954) Sampling time One (1) second approx. Data output Isolated serial RS-232 PC Interface Data Hold Freezes displayed reading Min/Max Memory Meter stores highest and lowest readings for later recall Data Logger Store up to 500 readings Data logger Sample Time 0 (manual), 1, 2, 5, 10, 30, 60, 600, 1800 and 3600 sec.
Appendix A: Machinery Classification When evaluating machinery and equipment it is useful to know their classification range and group type. There are four machine groups and classification ranges recognized internationally (ISO 2372 and VDI 2056). The limits for vibration severity (mm/s) are shown in the Tables below: GROUP K – Small Machinery up to 15KW (for example, production motors) Testing Status Vibration Severity (mm/s) Good 0 to 0.71 Acceptable 0.72 to 1.80 Permissible 1.81 to 4.
Appendix B: Relative Sensitivity Table (ISO 2954) Relative sensitivity Frequency (Hz) Normal value Minimum value Maximum value 10 1.0 0.8 1.1 20 1.0 0.9 1.1 40 1.0 0.9 1.1 80 1.0 1.0 1.0 160 1.0 0.9 1.1 500 1.0 0.9 1.1 1000 1.0 0.8 1.1 Appendix C: Glossary Vibration: Vibration is an oscillation or repetitive motion of an object around an equilibrium position.
