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MMF VM24, Instruction Manual

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MMF VM24 Instruction Manual Download Page 26

To calibrate the instrument, open the “Calibration” menu and select „Vibration cali-
brator”. You will be requested to mount the sensor on to the vibration exciter (29).
This is done using the magnetic base. Press OK.  

The VM24 is now ready for the reference vibration signal. It displays the measured
acceleration (30). 

24

Figure 28: Vibration Calibrator VC20

Figure 29: Calibration menu

Figure 30: Calibration

Summary of Contents for VM24

Page 1: ...Manfred Weber Metra Mess und Frequenztechnik in Radebeul e K Meissner Str 58 D 01445 Radebeul Tel 49 351 836 2191 Fax 49 351 836 2940 Email Info MMF de Internet www MMF de Vibration Meter VM24 Valid f...

Page 2: ...91 Fax 49 351 836 2940 Email Info MMF de Internet www MMF de Note The latest version of this manual can be found at http www mmf de prod uct_literature htm Specification subject to change 2012 Manfred...

Page 3: ...ions 13 5 3 2 Mounting the VMID Measurement Point 13 6 Measurement 14 6 1 Measurement Value Display 14 6 2 Selecting the Display Quantity 14 6 3 Measurement Point Detection 15 6 3 1 Reading the VMID D...

Page 4: ...2 Figure 1 VM24 with Sensor...

Page 5: ...asurements of a large number of measurement points very effectively A software package for transferring the measurement data to a PC is also available from Metra In the common hierarchy of condition m...

Page 6: ...on is carried out in the micro controller The micro controller also controls the graphic display the USB communication and the storing of measurements 3 Measuring Ranges 3 1 Measurable Vibration Quant...

Page 7: ...earings can be monitored whilst vibrational unbalances are attenuated 3 3 Vibration Velocity Measuring vibration velocity is a common procedure for assessing the running smooth ness of rotating machin...

Page 8: ...ls v a 2 f It is evident that in the case of constant acceleration a the value of velocity v drops at higher frequencies f As a consequence the measuring range limits of the velocity mea surements are...

Page 9: ...other hand frequencies in the range of less than one hundred Hertz are so strongly dampened that an evaluable display value is no longer recognizable Due to these restrictions displacement measuremen...

Page 10: ...ment of the VM24 enables maximum utilization of the batteries Attention Please switch the instrument off before changing the batteries When switched off the contents of the memory are stored for a few...

Page 11: ...Batteries do not belong to the household waste 4 2 Switching On and Off The instrument is switched on by a short press of the ON OFF button A start screen will be shown on the display for 3 seconds 9...

Page 12: ...thin the sub menu select Battery type 11 by following the same instructions as before and then by pressing select between Alkaline non rechargeable 1 5 V or NiMH accu rechargeable 1 2 V Confirm your c...

Page 13: ...eir source This helps to reduce distortion of the measuring signal to a minimum when it is being carried through transmission parts Suitable measurement points include rigid machine components such as...

Page 14: ...arious machine type Figure 13 Measuring points on vertical bearings Figure 14 Measuring points on flange bearings Figure 15 Measuring points on electric motors Figure 16 Measuring points on ma chines...

Page 15: ...is 80 C 5 3 2 Mounting the VMID Measurement Point A VMID measurement point is mounted onto the machine using two component epoxy adhesive For an accurate vibration transmission Metra recommends the f...

Page 16: ...celeration 3 Hz 1 kHz Vibration acceleration 1 kHz 10 kHz Vibration velocity 2 Hz 1000 Hz Vibration velocity 10 Hz 1 kHz Vibration displacement 5 Hz 200 Hz By pressing F2 you can switch between RMS an...

Page 17: ...the VM24 displays the measurement point number Point ID 20 6 3 2 Entering the Measurement Point Text If a measurement point has not yet been assigned a text press the key to reach the text edit menu...

Page 18: ...ttings Note Changing the measuring point data also effects the display of saved measur ands cf Chapters 6 5 and 6 6 The current saved text of the respective VMID se rial number is always displayed in...

Page 19: ...nt data effects the display of saved measurements chapter 6 6 Instead of the measurement point serial number and the measurement point text being shown none is displayed The measurement point data rec...

Page 20: ...measurand At each data point the date and time of the measurement as well as the measured RMS are displayed Above the diagram the text assigned to the measure ment point is displayed In order to be ab...

Page 21: ...te the entire measurement data After pressing OK a warning message will ap pear showing the total number of records 7 Measurement Evaluation with Standard Values To be able to derive statements from t...

Page 22: ...4 5 mm s 2 8 mm s 1 8 mm s 1 12 mm s 0 71 mm s 0 45 mm s 0 28 mm s D Risk of machine damage C Restricted continued operation B Unrestricted operation possible A Newly commissioned machine Table 1 Typi...

Page 23: ...ight above 315 mm Electric motors with a shaft height between 160 and 315 mm Foundation flexible rigid flexible rigid v eff 10 1000 Hz 11 mm s D D D D 7 1 mm s C D D D 4 5 mm s B C C D 3 5 mm s B B B...

Page 24: ...of damage to the machine C Restricted operation B Lasting operation in safe working operating range without restrictions possible A Newly commissioned pumps in preferred operating range Table 3 Class...

Page 25: ...d with the supplied vibration transducer The serial number of the instru ment and the transducer are stated on the calibration certificate The month and year of the factory calibration are displayed w...

Page 26: ...be requested to mount the sensor on to the vibration exciter 29 This is done using the magnetic base Press OK The VM24 is now ready for the reference vibration signal It displays the measured accelera...

Page 27: ...which produces a positive DC voltage po tential at the output Due to this DC voltage an assessment can be made of the sen sor s operating condition The VM24 detects three operational conditions 0 1 V...

Page 28: ...both data files in a directory on your computer When Windows requests details of the source of the device driver this directory should be entered The device driver is digitally signed and runs with W...

Page 29: ...k whether a more up to date version than currently installed is available To view the latest version visit our Software Download site http www mmf de software download htm Here you will see the most r...

Page 30: ...OM port assigned by the PC If you are not sure which of the available COM ports is correct you can check in the Windows system control manager located within the instrument manager 5 Click on Load in...

Page 31: ...n the update is finished the VM24 will start up and the Firmware Updater will close Please do not interrupt the update process Fol lowing transfer failures the update can be restarted at point 3 Impor...

Page 32: ...lacement 5 Hz 200 Hz 3rd order Butterworth filter Overload indication at 200 m s vibration acceleration on the sensor or 1000 mm s or 60 mm after the integrator Measurand memory Flash 16000 data recor...

Page 33: ...mm Weight 53 g Sensor cable spiral cable extended length 1 6 m Measurement Point Detection Principle digitally stored in VMID measuring point read through sen sor base Coding 16 digit unique hexadecim...

Page 34: ...y under this warranty does not apply to any improper or inadequate maintenance or modification and operation outside the product s specifications Shipment to Metra will be paid by the customer The rep...

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