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9.2.1.6. Weighting Filter W

h

The weighting filter W

h

 is intended for measuring hand-arm vibration in three axes to ISO 5349-

1. 

Figure 16: Weighting filter W

h

9.2.1.7. Weighting Filter W

j

The weighting filter W

j

  is used for measuring vibrations acting on the head of a recumbent 

person in vertical direction (perpendicular to the lying surface) to ISO 2631-1.

Figure 17: Weighting filter W

j

21

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Содержание VM30-H

Страница 1: ...instrument page 47 Manfred Weber Metra Mess und Frequenztechnik in Radebeul e K Meissner Str 58 D 01445 Radebeul Phone 49 351 836 2191 Fax 49 351 836 2940 Email Info MMF de Internet www MMF de Human...

Страница 2: ...The latest edition of this document can be found under http www mmf de product_literature htm Manfred Weber Metra Me und Frequenztechnik in Radebeul e K May 12 193...

Страница 3: ...gs at the VM30 H 12 5 3 3 Evaluation of Health Risks 14 5 3 4 Comfort Evaluation 15 5 3 5 Reporting of Measuring Results 15 6 Switching the Instrument On and Off 16 7 Sensor Input 16 8 Display 17 9 Si...

Страница 4: ...Excel Macro 31 13 3 Calculation of the Daily Exposure Value A 8 33 13 4 Function of the Excel Macro 36 13 5 Transmission to PC by a Terminal Program 37 14 Time and Date 38 15 Calibration and Function...

Страница 5: ...25 Technical Data 50 Appendix Warranty Declaration of Conformity...

Страница 6: ...ISO 8041 for measuring instrumentation for human vibration Particular attention has been paid to simple operation compact design and long battery operating time 2 The Instrument at a Glance Figure 1...

Страница 7: ...password protected GainRangeY GainRangeZ by data logger 2 8 Recording setup Log file title 4 8 Erase memory 5 8 Time and date 6 8 Load defaults 7 8 Sensor Byvibration calibrator Bytransducersensitivi...

Страница 8: ...s for selected vibration quantity RunningRMS 1s Max runningRMS Interval RMS Estimatedvibr dose Total vibrationvalue Peakvalue 1s Max peakvalue Crest factor RMS MTVV A T eVDV Ahv PEAK PEAK CREST Enter...

Страница 9: ...portable power tools Measurement of vibrations at the handle ISO 6954 Guidelines for the measurement reporting and evaluation of vibration with regard to habitability on passenger and merchant ships I...

Страница 10: ...h adequate rest periods Provision of clothing to protect workers from cold and damp In any event workers shall not be exposed above the exposure limit value If this should be the case the employer sha...

Страница 11: ...filter Wh This vector sum is often called Total Vibration Value ahv awe ahv awx 2 awy 2 awz 2 Equation 3 In the case of machines which need to be held with both hands measurements must be made on eac...

Страница 12: ...selected sensor you may answer the question Edit this sensor with No Otherwise select Yes choose the nominal transducer sensitivity 1 or 10 mV m s 2 and enter in the menu By transducer sensitivity th...

Страница 13: ...s used under normal operating conditions Since most machine tool handles do not provide surfaces for the adhesive or screw attachment of sensors Metra offers some mounting accessories for curved surfa...

Страница 14: ...easurement must be after the start of vibration exposure Otherwise the result averaged over the entire measuring time would be wrong The duration of measurement shall represent a typical work process...

Страница 15: ...interval RMS With the gain settings made before there should be no overload Save the measurement with the SAVE key If the vibration exposure consists of different sections more than one measurements m...

Страница 16: ...or each activity Results for daily exposure A 8 Vibration total values for each activity Duration Ti of vibration exposure for each activity Partial exposure Ai 8 Daily exposure A 8 Assessment of meas...

Страница 17: ...on page 23 5 3 2 Settings at the VM30 H For whole body vibration interval RMS is measured for each coordinate direction Select first the measuring ranges for X Y and Z A good method is starting with...

Страница 18: ...face X Y Z Wd Wk 1 1 footrest X Y Z Wk 0 25 0 4 backrest X Y Z Wc Wd Wd 0 8 0 5 0 4 standing footrest X Y Z Wd Wk 1 1 recumbent pelvis X vertical Y Z horizontal Wk Wd 1 1 head X vertikal Wj 1 undefine...

Страница 19: ...e mode If necessary select in the menu 2 8 Recording setup the mode manually by SAVE key Otherwise the data logger will start after pressing the SAVE key You may also choose whether you like to save d...

Страница 20: ...rather regarded as disturbing than the vibration of a building machine Although there is no general relationship between well being and acceleration the interval RMS can be measured in three directio...

Страница 21: ...MENU 8 8 Device settings 2 6 Shut off timer the instrument switches off after 1 10 or 30 minutes 7 Sensor Input The VM30 H is suited for the connection of all piezoelectric IEPE accelerometers which w...

Страница 22: ...ge in the measuring range by the autoranging function The VM30 H may also display OVER LOAD instead of the measuring value The selected filter type is displayed in the center above the measuring resul...

Страница 23: ...g filters for each vibration quantity mode The weighting filters for human vibration conform to ISO 8041 and cover most applications in this field 9 2 1 Weighting Filters The weighting filters Wb Wc W...

Страница 24: ...inal column to ISO 2631 1 Figure 12 Weighting filter Wc 9 2 1 3 Weighting Filter Wd The weighting filter Wd is used for measuring whole body vibration in seated standing or recumbent positions at righ...

Страница 25: ...Figure 14 Weighting filter We 9 2 1 5 Weighting Filter Wg The weighting filter Wg is used for the evaluation of whole body vibration in the direction along the spinal column with regard to hand contro...

Страница 26: ...6 Weighting filter Wh 9 2 1 7 Weighting Filter Wj The weighting filter Wj is used for measuring vibrations acting on the head of a recumbent person in vertical direction perpendicular to the lying sur...

Страница 27: ...he lying surface in recumbent position and for vibrations in all three directions acting on the feet in seated position to ISO 2631 1 Figure 18 Weighting filter Wk 9 2 1 9 Weighting Filter Wm The weig...

Страница 28: ...To compensate this the displayed X and Z values must be swapped 9 2 2 Band Pass Filters Band pass filters differ from weighting filters by their linear passband response They are used for various app...

Страница 29: ...tion Value MTVV The maximum transient vibration value is the highest magnitude of the running RMS from the start of measurement It has the display abbreviation MTVV A measurement is started by pressin...

Страница 30: ...stimated Vibration Dose Value eVDV The Vibration Dose Value is the integrated fourth power vibration value with the unit m s1 75 It is used for whole body vibration measurement Its particular advantag...

Страница 31: ...displayed after the selection of Ahv showing that autoranging is not available in this mode and the gain of all channels is set to 0 1 corresponding to the highest measuring range Another range can be...

Страница 32: ...ps After the selection of vibration quantity filter and display mode you will be asked if you want to save your settings Save settings If you press the ESC key you will then escape the setup menu with...

Страница 33: ...ration displacement 1 mV ms 2 10 mV ms 2 100 12 m s peak 1 2 m s peak 120 mm speak 12 mm speak 1 2 mmpeak 0 120 mmpeak 10 120 m s peak 12 m s peak 1 2 m speak 0 12 m speak 12 mmpeak 1 2 mmpeak 1 1200...

Страница 34: ...ime and the date are to be added to the saved measuring values Time controlled recording in the data logger mode in a user defined time interval between 1 second and some hours The selection of the re...

Страница 35: ...manually saved data a warning will inform you that this data must be overwritten Data logger operation can be recognized by the increasing record number M0000 in the upper left display corner While th...

Страница 36: ...Vista and Windows 7 The Excel file includes a Visual Basic Macro which enables Excel to read data from the serial interface and to sort it into table fields To give the macro access to the serial inte...

Страница 37: ...he MENU key Select by the keys 8 8 Device settings Go to submenu 5 6 Baud rate and choose the desired baud rate by In the Import worksheet you can change the number of worksheets to be prepared for da...

Страница 38: ...aily exposure value A 8 helps to compare the vibration exposure for different persons and activities A 8 is also the basis for the determination of the daily exposure limit and the daily exposure acti...

Страница 39: ...middle part 2 using pull down menus In addition for each Ahv value the exposure duration must be entered in the format hh mm An example is shown in Figure 24 When the assignment is finished click on t...

Страница 40: ...35...

Страница 41: ...its CLOSECOM closes the serial interface TIMEOUT ms is the maximum waiting time when receiving data from the serial interface in milliseconds Transmission is stopped if no data is received before the...

Страница 42: ...gs to make a new connection with the serial interface or USB RS232 adapter Enter the used COM port number the VM30 H baud rate section 16 5 7 data bits even parity 1 stop bit and no flow control Figur...

Страница 43: ...nd day using the keys Each value becomes effective as soon as you press OK By pressing ESC you may leave the menu without changes The correct time settings can be checked by the INFO key The real time...

Страница 44: ...tivities of 1 and 10 mV m s are available Press OK and choose the calibration mode By transducer sensitivity Press OK again and enter the sensitivities in mV ms 2 from the supplied calibration certifi...

Страница 45: ...Signal Level RMS Frequency Settings at VM30 H Typical display values m s X Y Z Max Error Calibration with hand arm accelerometer nominal sensitivity 1 mV ms 2 X 50 m s 80 Hz 10 1250 Hz a A T 120 m s...

Страница 46: ...G 100 3 16 3 16 3 16 3 XYZ 10 mV 80 Hz 0 4 1250 Hz a RMS G 100 1 00 1 00 1 00 3 XYZ 3 16 mV 80 Hz 0 4 1250 Hz a RMS G 1000 0 316 0 316 0 316 3 XYZ 1 mV 80 Hz 0 4 1250 Hz a RMS G 1000 0 100 0 100 0 10...

Страница 47: ...Wd Wc HV RMS G 10 1 1 1 1 4 3 21 XYZ 500 mV 80 Hz Wd Wk HV RMS G 10 1 1 1 1 6 7 21 XYZ 500 mV 80 Hz We HV RMS G 10 0 6 0 6 0 6 50 XYZ 500 mV 80 Hz Wg HV RMS G 10 4 2 4 2 4 2 21 XYZ 500 mV 80 Hz Wh HV...

Страница 48: ...not loosen any other screws at the bottom plate of Model KB103SV Metra offers as optional accessory the mounting adapter Model 144 for attaching the seat pad accelerometer KB103SV to a vibration excit...

Страница 49: ...e of the RS 232 interface Available are 19200 38400 57600 and 115200 bits per second Default value is 57600 If you have problems with faulty data transmission e g with older PC models lowering the bau...

Страница 50: ...tion it is necessary to select the correct battery type Go to menu 8 8 Device settings and submenu 3 6 Battery type Select the used battery type by the keys and confirm by OK If the battery voltage dr...

Страница 51: ...tside A protective cover makes the socket waterproof IP65 when not in use 20 Loading Default Settings The instrument can be reset to the initial factory settings by choosing the menu item 6 8 Load def...

Страница 52: ...rsion than the one installed on your VM30 H You may check the installed version in the menu 8 8 Device settings 4 6 Factory settings At first you need to download the program MMF Firmware Updater and...

Страница 53: ...s is indicated at the VM30 H by the display back light flashing The update process must not be interrupted Reception errors are signaled by a PC error message If an error has occurred restart the firm...

Страница 54: ...Device settings Why does the VM30 H ignore or change my settings of the measuring range You measure eVDV or interval RMS A T These display modes do not allow the use of autoranging Channels with autor...

Страница 55: ...st factor Weighting filters Wb Wc Wd We Wg Wh Wj Wk Wm Band filters 3 dB limits 6 200 Hz displacement 0 4 100 Hz acceleration and velocity 2 300 Hz acceleration and velocity 0 4 1250 Hz acceleration a...

Страница 56: ...emale 5 pins Shut off timer After 1 10 30 minutes or no shut off Operating temperature range 10 to 50 C 95 relative humidity without condensation Deviation over temperature and humidity range Instrume...

Страница 57: ...e as evidence The warranty period ends after 24 months Repairs do not extend the warranty period This limited warranty covers only defects which arise as a result of normal use according to the instru...

Страница 58: ...above mentioned product complies with the demands pursuant to the following standards EN 55022 1998 EN 55024 1998 Responsible for this declaration is the producer Manfred Weber Metra Mess und Frequen...

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