GJX-3 Vibration Calibrator
Contents
1. to minimum before turn on the power 4 The parameters of GJX 3 Vibration Calibrator are defined as following Acceleration m s PEAK Velocity mm s RMS Displacement um PK PK 5 During calibration the instrument shall be placed steadily 6 During the calibration of velocity transducers attention to the direction of installation of the transducer shall be paid If it is a horizontal transducer the calibrator shall be placed horizontally If it is a vertical transducer the calibrator shall be placed vertically For general type transducers the calibrator may be placed either horizontally or vertically General Description GJX 3 Vibration Calibrator can be used to calibrate many kinds of vibration transducers such as acceleration transducer velocity transducers and proximity transducer system and also to calibrate the vibration measuring instruments and vibration monitoring systems and data collecting systems compose of the said transducers Standard sine signals with eight kinds of frequency i e 10 20 40 80 160 320 640 and 1280 Hz can be generated from the calibrator The amplitude of the three kinds of vibration output i e acceleration velocity and displacement can be changed through potentiometers and shown on digital displays They can be used in either horizontal or vertical direction to calibrate horizontal or vertical transducers GJX 3 Vibration Calibrator combines sine signal generator power amplifier standard2. transducers Fixing stand shall be used for the installation of proximity probe The accessories used with GJX 3 Vibration Calibrator include M5 screw for fixing acceleration transducer M5 M8 M5 M10 transition screw for fixing velocity transducer and the fixing stand for fixing proximity probe e Different accessories for GJX 3 Vibration Calibrator are stored in the cover of the container of the calibrator Push the cover to right and take it down Accessories 1 Fixing stand for proximity probe 2 Spindle micrometer 3 Tool to fix the sensor 4 Testing plate for proximity probe 5 M5 Fixing screw for acceleration transducer 6 M5 M8 Transition screw for velocity transducer 7 M5 M10 Transition screw for velocity transducer E F ce ES 23 j F D Fixing stand Spindle micrometer 4 _ gt Tool to fix the sensor Testing plate 6 3 M5 Fixing screw 3 L1 M5 M8 Transition screw 3 M5 M10 Transition screw The calibration of acceleration transducer 1 Fix M5 screw Acceleration transducer on the transducer fixing table of the calibrator respectively ACCELERATION TRANSDUCER CHARGE AMPLIFIER 3 Set the FREQ SELECT switch to 80 Hz n general the frequency shall be set at 80Hz During calibration although other frequencies may also be used ACCELERATKON TRANSDUCER Li M3 FLING SCREW Connect the acceler
3. BEIJING SENDIG TECHNOLOGY LTD USER S MANUAL For the GJX 3 Vibration Calibrator The information provided in this Manual is believed to be reliable However SENDIG Technology assumes no responsibility for inaccuracies or omissions SENDIG Technology assumes no responsibility for the use of this information and all use of such information shall be entirely at the users own risk Specifications are subject to change without notice No patent rights or licences to any of the functions described are implied or granted to any third party SENDIG Technology does not authorise or warrant any SENDIG Technology product for use in life support devices or systems E mail sales sendig com sendigbj yahoo com cn Fax 8610 82895320 Telephone 8610 82895321 Address International Science and Technology ChuangYe Garden No 1 Xinxi Road Beijing P R China Postcode 100085 http www sendig com Revision B June 9 2006 Remarks Thank you for selecting GJX 3 Vibration Calibrator In order to help you to understand the performance of this instrument better and to use it correctly please pay attention to the following 1 Please read this instruction carefully before use 2 When you do the calibration the procedures required by this instruction according to different types of the transducers shall be followed 3 To avoid excess vibration of the top of the vibrostand the AMPLITUDE ADJUST potentiometer shall be turned counterclockwise
4. RIZONTAL ft aa o a ATi E S The calibration of Proximity Transducer Systems 1 Fix the testing plate Probe fixing stand and Probe on the control panel of the calibrator respectively Adjust the distance between sensor to vibration surface to1mm Connect the Probe Proximitor And digital voltmeter correctly Set the FREQ SELECT switch to 80 Hz When calibrating a displacement Transducer a lower frequency shall Be selected to obtain a larger Displacement output from the calibrator 5 Set the FUNCTION Switch to DISP L Set the AMPLITUDE ADJUST Potentiometer to minimum and set POWER to ON AMPLITUDE FINE ADJUST 7 Set the AMPLITUDE ADJUST Potentiometer according to the full range of the transducer to make the amplitude of the vibration displacement output to reach an appropriate value At this time the display shows the PK PK say 800um Peat be eet herini AMPLITUDE PINE ADAPST DIGITAL VOLTMETER 8 Use a digital voltmeter to measure the voltage output of the Proximitor Based on the actual value measured the error of the transducer can be calculated Standard Value Measured Value EEE site x 100 Standard Value The standard value is determined by the sensitivity of the transducer to be calibrated For example If the sensitivity of the transducer is 8mV um PK PK and the displacement is 800um th
5. Set the FREQ SELECT switch to 80Hz In general the frequency shall be set at 80Hz during the calibration although other frequencies may be used also VELOCITY TRANSDUCER ME MIB TRANMESITKIN SCREW 2 Connect the output lead of the velocity transducer to be calibrated with a digital voltmeter Set the FUNCTION Switch to VEL 5 Set the AMPLITUDE ADJUST PS Potentiometer to minimum set NACE MAT hn e the POWER to ON eh AMPLITUDE FME vr An d j E m Jj i je E B eee 6 Adjust the AMPLITUDE ADJUST Potentiometer until the output amplitude of the vibration velocity of the calibrator shown on the display reaches 10 mm s Use a digital voltmeter to measure the voltage output of the transducer to be alibrated Based on the measured value of the voltage output of the transducer the error of this transducer can be calculated Standard Value Measured Value ErrOr a X 100 Standard Value Standard value is determined by the sensitivity of the transducer for example If the sensitivity of the transducer is 200mV cm s its voltage output standard value will be 200 mV If the sensitivity of the transducer is 280mV cm s its voltage output standard value will be 280 mV If the transducer to be calibrated is a horizontal transducer the calibrator shall be placed horizontally and if it is a vertical one the calibrator shall be placed vertically VERTICAL HO
6. ation transducer to be calibrated with the input of the Charge Amplifier connect the voltage output of the Charge Amplifier with a digital voltmeter See Operating Instruction of the Charge Amplifier for its setting ipo AC PES 2a a til ID e a 1280 FREG SELECT Hz Set the FUNCTION switch to ACC 5 Set the AMPLITUDE ADJUST Potentiometer to minimum set the POWER to ON AMPLITUDE FINE ADJUST Adjust the AMPLITUDE ADJUST Potentiometer until the output amplitude of vibration acceleration of the calibrator is shown on the display as 10 0 m s AMPLITUDE FINE ADALST Use a digital voltmeter to measure the voltage output of the Charge Amplifier 8 Based on the measured value of the voltage output from the Charge Amplifier and the standard voltage value of the Charge Amplifier at acceleration of 10 m s the error of the transducer calibrated can be calculated Standard Value Measured Value Error LLL X 10096 Standard Value The standard value is determined by the setting of the Charge Amplifier If the acceleration is 10m S the voltage output of the Charge Amplifier is set at 1 V Peak value RMS value will be 707 00mV The calibration of velocity transducer 1 Fix M5 M8 or M5 M10 transition screw according to the velocity transducer to be calibrated and the transducer on the transducer fixing table respectively VELCXCITY TRANSDUCER 3
7. e will be no vibration signal output from the calibrator Description of the Control Panel The control panel of GJX 3 Vibration Calibrator is shown as following SENDIG m Wawami E ze i 12 1 aa eo TRATION CAUIBRATOR oan BHPLITLOE MEE ADAT amp r 1 Vibration amplitude output display Showing the amplitude of the different vibration signal output of the calibrator 2 Calibration potentiometer 3 Function selecting switch Shifting the output of the calibrator to acceleration velocity or displacement 4 Potentiometer for adjusting the output amplitude Adjusting the potentiometer to change the output vibration amplitude 5 Adjusting the the output vibration amplitude slowly 6 The table for fixing the transducer to be calibrated 7 The thread hole for fixing the stand of proximity probe During the calibration of proximity probe the stand of the transducer is fixed on the control panel through this thread hole 8 Power switch 220 VAC 9 Socket for 220 V AC power input Used for connecting 220 V AC power 10 Socket for power output For monitoring the wave shape of the output signal of the power amplifier of the calibrator 11 Output socket of 24 V voltage Providing power at 24 V for proximitor during the calibration of proximity probe 12 Frequency selecting switch For selecting the frequency of the output signal Accessories Different fixing screws shall be used to install acceleration transducers or velocity
8. en the voltage output of the proximitor will be 800 um x 8 mV um 6400 mV PK PK At this time the RMS value of the voltage output of the proximitor shall be 6400 mV PK PK 2 828 2263mV 2 263V RMS DIGITAL VOLTMETER 9 A spindle micrometer is used to check the transducer system A probe mounting adapter provided with the GJX 3 holds the probe while the target is moved toward or away from the probe tip in calibrated increments and the Proximitor s output is recorded using a voltmeter Physical Size 280 x 180 x 250 mm Weight 20lb Environmenta Temperature Operation 0 C to 50 C Storage 20 C to 70 C Humidity 90 non condensing
9. transducer and the vibrostand in one and features a smaller volume high accuracy and easy operation It can be used either in laboratory or on site Specifications Frequency 10 20 40 80 160 320 640 1280Hz 0 01 Unit Acceleration m s PEAK Velocity mm s RMS Displacement um PK PK Amplitude accuracy Acceleration 30m s pk 80Hz 40Hz to 320Hz 0 3dB 1digit 10Hz to 1280Hz 0 5dB 1digit Velocity 25mm sec pk 80Hz 40Hz to 320Hz 0 5dB 1 digit Displacement 10um pk pk 80Hz 40Hz to 320Hz 0 5dB 1digit Proximity probe linearity Prode 5mm and 8mm probes Range 0 4 0mm Display 3 1 2 digit display for acceleration velocity or displacement Maximum vibration amplitude and maximum load Because of the vibrostand used in GJX 3 Vibration Calibrator is rather small during the calibration of transducers of different weight under different frequencies the output amplitude of the calibrators are also different Maximum vibration amplitude and maximum load are related to the maximum acceleration maximum velocity and maximum displacement output generated from the calibrator under a certain frequency and with a certain weight of the transducer to be calibrated The specific figures can be seen in the following table 10Hz 20Hz 40Hz 80Hz 160Hz 320Hz 640Hz 1280Hz e With higher frequency the value of the displacement of vibration is very small so ther
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