Manufacturers' Specifications
Larson Davis HVM100 Vibration Meter
Standards
The Larson Davis HVM100 Human Vibration Meter is a Type 1 instrument designed for use in assessing vibration as perceived by human beings. The instrument meets the requirements of ISO 8041:1990(E) including Amendment 1: 1999(E).
Additionally, the current ISO 8041 standard, and therefore the HVM100, is compatible with the standards listed below. These standards define methods for the measurement of whole body and hand arm vibration.
ISO 2631-1:1997 Mechanical vibration and shock - Evaluation of human exposure to whole body vibration -- Part 1: General requirements.
ISO 2631-2:1989 Evaluation of human exposure to whole body vibration - Part 2: Continuous and shock induced vibrations in buildings (1 to 80 Hz)
ISO 2631-4:2001 Mechanical vibration and shock - Evaluation of human exposure to whole body vibration - Part 4: Guidelines for the evaluation of the effects of vibration and rotational motion on passenger and crew comfort in fixed guide way transport systems
ISO 5349-1:2001 Mechanical vibration - Measurement and evaluation of human exposure to hand-transmitted vibration -- Part 1: General requirements
ISO 5349-2:2001 Mechanical vibration - Measurement and evaluation of human exposure to hand transmitted vibration -- Part 2: Practical guidance for measurement at the workplace
- Inputs : ICP sensors, charge output sensors or direct voltage.
- Input Range : >100 dB in multiple ranges.
- Range Gain : x1, x10, x100, x1000.
- Calibration : By level or key-in accelerometer sensitivities.
- Units : ms-2, cms-2, fts-2, ins-2, g, dB.
- Vibration Parameters : Ams, Amin, Amax, Aeq, Amp, Peak.
- Hand Arm Parameters : Arms, Amin, Amax, Aeq, Amp, Peak, A(1), A(2), A(4), A(8) Allowed Exposure Time.
- Whole Body Parameters : Arms, Amin, Amax, Aeq, Amp, Peak, CFmp, CF, VDV.
- Vibration Frequency Ratings : Ws (Severity), Fa (0.4 Hz to 100 Hz), Fb (0.4 Hz to 1250 Hz), Fc (6.3 Hz to 1250 Hz).
- Hand Arm Frequency Ratings : Wh.
- Whole Body : Wb, Wc, Wd, We, Wg, Wj, Wk, WB.
- Setups : Store up to 10 user setups.
- Memory : 100 measurements, 1 minute to 99 hours.
- Time History : 120 samples of Arms and Peak at a period of 1, 2, 5, 10, 20, 30, 60 seconds.
- Interface : RS-232 on 8-pin DIN, up to 115 kbps.
- AC Outputs - 3 channels : Weighted or band-limited.
- DC Outputs - 3 channels : rms, min, max, peak, sum rms, sum max, sum min, sum peak.
- Output Impedance : 475 ohms - all outputs.
- Peak : ± 0.5 dB accuracy.
Effects of Temperature
The RMS level varies ±0.5 dB when the complete instrument is tested over the - 10° C to 50° C temperature range. The reference reading, for this test, is taken at 20° C and 36% relative humidity (RH); the input signal is at 79.6 Hz.
Effects of Humidity
The RMS level varies ±0.5 dB when the complete instrument is tested over the 30% to 90% RH range. This test is performed at 40° C, with an input signal of 79.6 Hz.
Limits of Temperature and Humidity
Permanent damage can occur when stored or operated above 60° C or below -20° C. Condensation of moisture will make readings inaccurate. When condensation dissipates, readings should return to normal.
Effects of Magnetic Fields
The RMS level varies ±0.5 dB when the complete instrument is tested in an 80 A/m, 60 Hz magnetic field (worst case orientation).
Effects of Mechanical Vibrations
The instrument meets the specifications for susceptibility to vibration in accordance with ISO 8041:1990(E) section 7.1.
Stabilization Time
At power-on, allow the instrument to stabilize, approximately 20 seconds, prior to performing any measurements. When changing from one type of input (Direct/Charge/ICP®) to another or when changing the instruments gain settings, allow 10 seconds of stabilization time prior to performing a new measurement.
Data Storage
• 1/2 Mega Byte Memory
• Capable of storing 100 files and 10 setups
• 2 minute (typical) data retention for clock during battery change
Data Communications
• RS-232 Serial Interface
• Maximum Data Rate: 115,000 bits per second
Digital Display
• 2 line, 32 digit, 7 segment LCD display
• Full ASCII character set
• 0.1 dB resolution
Real-time Clock/Calendar
• Accuracy: 0.02% (-10° C to 50° C)
• 24 hour clock: hh:mm
• Year 2000 Compliant
Run-time Clock
• One second resolution
• Format: hh:mm:ss
• Maximum run time: 99:59:59
Power Supply
• Operates with 2 AA alkaline batteries
• Typically operates for 12 hours (Charge/Direct modes)
• Battery life is reduced to approximately 4 hours when using ICP accelerometers.
• External Power: 7-30 volts DC
Dimensions/Weight
• Width: 3.25 inches (8.3 cm)
• Length: 6.0 inches (15.2 cm)
• Depth: 1.0 inches (2.5 cm)
• Weight: 9.8 ounces (279 grams) - including batteries
E&OE - specifications subject to change without notice.
See also our main Hand Arm Vibration White Finger and Whole Body Vibration web page
- Gracey & Associates 01933 624212
- BSI accreditation for instrument hire and calibration
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