MODEL VM2800 & VM3800 VibraCheck Limited and VibraCheck II Vibration Meter Installation Manual MN100003 METRIX Experience Value 8824 Fallbrook Dr. Houston, TX 77064, USA Tel: 1-281-940-1802 After Hours Technical Assistance: 1-713-452-9703 Fax: 1-713-559-9421 E-mail: info@metrixvibration.com www.metrixvibration.
Welcome................................................................................................................ 3 What is in the box? ................................................................................................ 4 Specifications for VibraCheck Limited and VibraCheck II: .................................... 5 General Layout of the VibraCheck II: .................................................................... 6 Inside the VibraCheck Limited & VibraCheck II: ....................
Welcome Congratulations on your purchase of the VibraCheck Limited or VibraCheck II Vibration Meter. This instrument is built with pride and has features that you will find useful in your measurements. This manual will provide you with all the information you require to get the greatest benefit from your measurement system.
What is in the box? The VibraCheck Limited or VibraCheck II measurement kit comes standard with the following items: Fig A. Fig. B. Fig. C. Fig. D. Fig. E. Fig. F. Fig. H. Fig. I. 1 ea. VibraCheck Limited or VibraCheck II 1 ea. 9 Volt Battery 1 ea. G-Spike probe and magnetic base 1 ea. Coiled Accelerometer cable 1 ea. Accelerometer 100 mV/ g 50 g range. 1 ea. High strength magnetic base for Accelerometer 1 ea. Calibration certificate 1 ea.
Specifications for VibraCheck Limited and VibraCheck II: Displacement 0- 1999 um, p-p (10 1 kHz BP) (0.00 - 78.7 mil) Velocity 0.0 – 1999.9 mm/s, 0-p (10-1 kHz, ISO 2954) (0.00 – 7.87 in/ sec) Acceleration 0.00 – 19.99 g, rms (10 Hz HP) Bearing Condition 0.0 – 199.9 mm/s (0-p), 500 Hz- 2 kHz) (0.00 – 7.87 in/sec.
General Layout of the VibraCheck II: Headphone Jack Accelerometer input ICP type only.
Inside the VibraCheck Limited & VibraCheck II: The VibraCheck Limited and VibraCheck II comes equipped with the highest quality components for accurate and repeatable vibration measurements. In the next sections, we will discuss how measurements are detected, filters and the reasons for having them. How is the vibration values measured? Internally, a (RMS) Root Mean Square detector is used to process the vibration signals. Peak to peak values are computed directly from this RMS value.
Typical high pass filter Typical band pass filter MN100003 REV A (12/07/10) Page 8
VibraCheck II Quick Guide: To begin: 1. Press and hold the on/ off button for 4 seconds. Press the on/ off button again to illuminate the display. 2. Connect accelerometer and headphone or optional thermometer if desired. 3. Select desired test you wish to make; Displacement, Velocity or Acceleration. 4. You may also choose in addition other functions such as hold. This “freezes” the display until the hold is pressed again. Gain will increase the resolution by one decimal place. Avg.
Display of the VibraCheck II: 1. Bias Indicator status: - OK - Open - Short 5. Hold, Gain, Average or Peak and memory review modes – V=Pod II only 2. Numerical value of the vibration level 4. Battery Indicator 3. Vibration units and method of detection 6. Storage location label for point storage or route based data collection storage- V-Pod II only 7. Stored data indicator V-Pod II only 1. Bias Indicator: The Bias indicator is located on the left side of the display.
2. Numerical Value of the vibration level: This is where the vibraiton levels are displayed for the function you have selected. For example, you may have selected hold to “freeze” the numerical display. 3. Vibration units and method of detection: Availalbe units for each selection: Displacement: um (P-P), Mil (P-P) Velocity: mm/s (0-P), mm/s (RMS), in/s (0-P), in./s (RMS) Acceleration: g (RMS), g (0-P), m/s2 (RMS), m/s2 (0-P) 4.
7. Stored data indicator- VibraCheck II only: In the lower right side of the display, when you see a black bar, indicates a value stored in this location. If this area is left blank, no value is stored at this memory location. Operation of the VibraCheck Limited and VibraCheck II: The VibraCheck Limited and VibraCheck II vibration meters are simple to use but yet very powerful. Each function has a distinct purpose and is shown on the display.
Gain: Press the gain key to increase the display Resolution. In this mode, the vibration signal will be amplified by 10 times. When this mode is turned on, you will observe a gain icon in the lower left display. To turn off, press the gain key again. Application tip: This function is very useful for low level vibration measurement. For example, the displacement level of a precision machine tool is typically within 1 um peak to peak.
BRG: Press the bearing key to activate the high pass filter. This will eliminate most frequencies below 500 Hz bandwidth. Therefore you will NOT see any vibration readings below 500 Hz. ** The Bearing function uses velocity method of measurement. The available units are mm/s or in/ s. The method of detection available is B-P or B-R. B-P represents “Bearing – 0-Peak” and B-R represents “Bearing – RMS”.
A Review Mode 3: By pressing the review key again, you will access the third review mode. This mode shows the letter A along with either 1K or a number. The number listed is the number of points on a scheduled route, whereas the 1K is the default for 1000 available points. Save: Pressing the save key will overwrite any data stored in a memory location and automatically advance to the next memory location. If you downloaded a scheduled route, this next location may be a label vs. a point number ie.
Using your VibraCheck Limited and VibraCheck II: Sensor Mounting: Each VibraCheck Limited and VibraCheck II is equipped with an accelerometer with a high-strength magnetic base and touch spike for sensor mounting. The accelerometer magnetic mount is capable of a wider frequency measurement than the spike. The spike is designed for measurement of vibration signals that range below 1 khz. It is always recommended to use the magnetic base where applicable.
Vibration level definitions: The chart below describes vibration levels for various machine types.
Setting the Units on your VibraCheck Limited & VibraCheck II: The default unit system is set at the factory to be: acceleration= g (rms), velocity = mm/sec (0-peak) and displacement = um (peak-to-peak) respectively. However, you may select your own unit system by the following steps. Acceleration: 1. Press acceleration key to select acceleration measurement. 2. Press and hold the acceleration key for 5 seconds, the units g(rms) and g(0-p), m/s2 (RMS), m/s2 (0-P), will appear cyclically.
Caution: The VibraCheck Limited and VibraCheck II accepts ICP* type accelerometers only. The accelerometer must be 100mV/G +- 30% for proper functionality. *ICP is a trademark of PCB piezoelectric Inc. Calibration and factors: Calibration should be completed by Metrix Instruments or by authorized dealers only. Calibration of the VibraCheck Limited and VibraCheck II is performed via a set of gain factors. Each gain factor is set at the factory prior to shipment.
ENVIRONMENTAL INFORMATION This electronic equipment was manufactured according to high quality standards to ensure safe and reliable operation when used as intended. Due to its nature, this equipment may contain small quantities of substances known to be hazardous to the environment or to human health if released into the environment. For this reason, Waste Electrical and Electronic Equipment (commonly known as WEEE) should never be disposed of in the public waste stream.
