• Large backlit LCD display simultaneously displays four channels
  • Selectable data sampling rate: 5, 10, 30, 60, 120, 300, 600 seconds
  • Remote vibration sensor with magnetic adapter on 39"(1m) cable
  • Wide frequency range of 10Hz to 1kHz
  • Basic accuracy of ±(5% + 2 digits)
  • RMS or Peak Value measurement modes
  • Data Hold, Auto Power Off
  • Complete with 4 remote sensors, magnetic mounts, 8 x AA batteries, 100-240V Universal AC Adaptor, SD card, and durable hard carrying case

Spec Sheets

4-Channel Vibration Meter / Datalogger

The Extech VB500 can display four (4) channels of simultaneous vibration measurements taken from remote vibration sensors. This meter displays and stores vibration readings of Acceleration, Velocity and Displacement. Supported measurement units are meters/s2, ft/s2, g, mm/s, cm/s, in/s, mm and inch. Logged data readings are stored on an SD card for transfer to a PC.


  • Motors, bearings
  • Fans
  • Pumps
  • Rotating machinery
  • Plant maintenance

Meter Description

  1. BNC adaptors
  2. Vibration pickup input jacks
  3. Side compartment (detailed below)
  4. Sensors
  5. Magnetic mount
  6. SET and Clock key
  7. MAX-MIN key
  8. ENTER and LOG key
  9. ? / Function key / Max. Reset / Zero
  10. ? / ACC-VEL-DISP key
  11. Power ON-OFF Power_ON-OFF key
  12. HOLD and Backlight LCD_Backlight_Key key
  13. Backlit LCD (Detailed below)


Display Description

  1. Battery status
  2. HOLD mode icon
  3. Record MIN MAX Mode active
  4. MAX display
  5. MIN display
  6. Peak Hold mode
  7. Data Hold mode
  8. RMS measurement
  9. Channel 1 reading
  10. Channel 2 reading
  11. Date and Time
  12. Channel 3 reading
  13. Channel 4 reading
  14. Datalogging active
  15. Units of measure and function icons detailed below:

ACC ‘Acceleration’ measurement mode
VEL ‘Velocity’ measurement mode
DISP ‘Displacement’ measurement mode
m/s2 Meters per second squared
mm/s Millimeters per second
ft/s2 Feet per second squared
g G-force
inch/s Inches per second
cm/s Centimeters per second
mm Millimeters
inch Inches
P-P Peak-to-Peak



    Side Compartment Description

    1. SD Memory Card slot
    2. 9V Power Adaptor jack
    3. RESET button
    4. Audio output jack

    Getting Started
    Power ON-OFF

    • Power the meter by pressing and holding the power button for Power_ON-OFF 3 seconds.
    • Press and hold the power button for at least 3 seconds to power OFF the meter.
    • This meter is powered by eight (8) 1.5V ‘AA’ batteries or by AC adaptor. If the meter will not switch ON please check that fresh batteries are installed in the rear battery compartment or, in the case of the AC adaptor, check that the adaptor is connected correctly to the meter and to an AC source.

    Display Backlight
    To turn the display backlight ON or OFF, press and hold the backlight LCD_Backlight_Keybutton for 3 seconds. The meter will beep when switching the backlight ON or OFF unless the beeper is disabled.

    Vibration Sensor

    • Connect a vibration pickup to the cable supplied. Make sure it is firmly attached.
    • Connect the cable to the meter by attaching it to a connector at the top of the meter.
    • If the surface to be tested is magnetic, attach the magnetic base to the vibration pickup and attach the pickup to a flat surface.
    • If the surface to be tested is not magnetic, hold the pickup against the surface. Do not hold the cable while making measurements.

    Units of Measure
    The currently selected unit of measure is shown on the meter’s LCD. To change the unit of measure, press and hold the ACC/VEL/DISP (up arrow) button until the desired unit of measure appears and then release the button. The meter begins scrolling through the available units of measure after the button has been depressed for 3 seconds. The saved units will become the default power-on unit of measure.



    Electrical Specifications
    Function Unit Range and Resolution Accuracy
    Acceleration m/s2 0 .5 to 199.9 m/s2 ± ( 5%rdg + 2 d )
    @ 80 and 160Hz
    g 0.05 to 20.39 G
    ft/s2 2 to 656 ft/s2
    Calibration Point: 50 m/S^2 ( 160 Hz )
    Velocity mm/s 0.5 to 199.9 mm/s ± ( 5%rdg + 2 d )
    @ 80 and 160Hz
    cm/s 0.05 to 19.99 cm/s
    inch/s 0.02 to 7.87 inch/s
    Calibration Point: 50 mm/s ( 160 Hz )
    Displacement mm 1.999 mm ± ( 5%rdg + 2 d )
    @ 80 and 160Hz
    inch 0.078 inch
    Calibration Point : 0.141 mm ( 160 Hz )
    Above specification tests under the environment RF Field Strength less than 3 V/M & frequency less than 30 MHz only and 23°C ±0.5°C


    General Specifications
    Model Extech VB500
    Acceleration 656ft/s2, 200m/s2, 20.39g (peak)
    Velocity 7.87in/s, 200mm/s, 19.99cm/s (peak)
    Displacement 0.078in, 2mm (peak-to-peak)
    Resolution 1ft/s2, 0.1m/s2, 0.01g; 0.01in/s, 0.1mm/s, 0.01cm/s; 0.001in, 0.001mm
    Basic accuracy ±(5%+2 digits)
    Memory 20M data records using 2G SD card
    Display 82 x 61mm (”) Backlit LCD
    Display update rate 1 second (approx.)
    Number of channels Four (4) input channels (CH1, CH2, CH3, CH4)
    Measurement Types Velocity, Acceleration, and Displacement
    Acceleration/Velocity: RMS, Peak, and MAX HOLD
    Displacement: p-p (peak to peak), MAX HOLD
    Units of measure Acceleration: m/s2, g, ft/s2
    Velocity: mm/s, cm/s, inches/s
    Displacement: mm, inches
    Frequency range 10Hz to 1KHz (sensitivity in this range meets ISO2954)
    Peak Hold Acceleration, Velocity: Measures and updates peak value
    Displacement: Measures/updates the p-p (peak-to-peak) value
    Max. Hold Acceleration, Velocity: Measures and updates Max. peak value
    Displacement: Measures/updates Max. p-p (peak-to-peak) value
    Max. Hold Reset Push-button activation
    Zero function Push-button activation for Acceleration (RMS) measurements
    Datalogger sampling rate Automatic: 1 second to 3600 seconds
    Manual: Push-button stores reading
    Datalogger accuracy ≤ 0.1% error of total saved data (typical)
    Memory card SD memory card (1G to 16G sizes)
    Data Hold Freezes displayed reading
    Audio Output mini stereo phone jack, Max voltage; 2V, output impedance; 100ohms
    Operating Temperature 0 to 50°C (32 to 122°F)
    Operating Humidity 85% R.H. max.
    Power Supply Eight (8) 1.5V ‘AA’ batteries or 9V AC adaptor
    Power Consumption Normal operation (backlight and datalogger OFF): approx. 12mAdc
    With backlight OFF and datalogging ON: approx. 35mAdc
    Weight Meter: 515g (1.13 lbs.)
    Probe with cable and magnetic base: 99g (0.22lbs.)
    Dimensions Main instrument: 203 x 76 x 38mm (8 x 3 x 1.5””)
    Probe: 16 x 37mm (0.63 x 1.45”) diameter
    Cable length: 1.2m (3.94ft)
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