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YOKOGAWA WE7235 User Manual Download Page 20

2-3

IM 707235-01E

Hardware Preparation

2

2.2

Connecting Acceleration Sensors

When measuring acceleration, connect acceleration sensors.  For a description on

acceleration sensors, see the respective manuals.

CAUTION

• Applying a voltage that exceeds the values indicated below to the accelerometer

module may damage the input section.

Maximum Input Voltage

60 V (DC + ACpeak)(Overvoltage Category CAT I and CAT II)

• When connecting acceleration sensors, make sure the supply current (bias) to

the sensors is OFF.  Otherwise, damage to the internal circuitry of the

acceleration sensors may result.

When Connecting Built-in Amplifier Type Acceleration Sensors

The WE7235 allows built-in amplifier type (low impedance) acceleration sensors to be

directly connected.  To connect built-in amplifier type acceleration sensors, use BNC

cables.  Use cables that are appropriate for the acceleration sensors being used.

Connect acceleration sensors with the supply current (bias) to them turned OFF.  After

connection, turn ON the supply current to the acceleration sensors for making

measurements.

When Connecting Charge Output Type Acceleration Sensors

Since the charge output type (high impedance) acceleration sensors do not have built-in

amplifier circuit, they cannot be directly connected to the WE7235.  Use either of the

following two methods to connect the sensors.

• Using the charge amplifier

Connect the charge output type acceleration sensor to a charge amplifier using a

highly isolated low-noise cable.  The acceleration signal (charge signal) that has been

converted to a voltage signal by the charge amplifier is input to the WE7235 using a

normal coaxial cable.  The WE7235 measures the signal in the voltage measurement

mode.  The measured data can be converted to acceleration values using the scale

conversion function of the WE7235.

WE7235

(Voltage measurement)

Charge output type 
acceleration sensor

Normal coaxial 

cable

Highly isolated 
low-noise cable

Charge amplifier

Summary of Contents for WE7235

Page 1: ...User s Manual 4 CH 100 kS s Accelerometer Module IM 707235 01E 1st Edition ...

Page 2: ...during operation Notes The contents of this manual describe WE7000 Control Software Ver 4 2 0 0 and module software Ver 3 01 The operating procedures and screen contents described in this manual may differ from those in other versions of the software The contents of this manual are subject to change without prior notice as a result of improvements in the software s performance and functions Every ...

Page 3: ...the model name given on the name plate matches those on the order MODEL Model Description 707235 WE7235 4 CH 100 kS s Accelerometer Module NO Instrument Number When contacting the dealer from which you purchased the instrument please quote the instrument No MODEL MODEL NO NO Made in Japan Standard Accessories The standard accessories below are supplied with the instrument Check that all contents a...

Page 4: ...tions Used in This Manual Units k Denotes 1000 Example 100 kHz K Denotes 1024 Example 720 KB Bolded Characters Characters written in bold mainly refer to on screen elements and hardware controls Symbols The following symbols are used in this manual A symbol affixed to the instrument Indicates danger to personnel or instrument and the operator must refer to the user s manual The symbol is used in t...

Page 5: ...4 IM 707231 01E ...

Page 6: ...her Modules Using the Bus Trigger Time Base Signal 1 9 1 7 Names and Function of Sections 1 11 Chapter 2 Hardware Preparation 2 1 Installing the Module into the Measuring Station 2 1 2 2 Connecting Acceleration Sensors 2 3 2 3 Connecting the Input Cable 2 5 Chapter 3 Troubleshooting and Maintenance 3 1 Troubleshooting 3 1 3 2 Acceleration Sensor Connection Test 3 2 3 3 Self Test 3 4 3 4 Maintenanc...

Page 7: ...current to the built in amplifier type acceleration sensor The output signal from the built in amplifier type acceleration sensor is the sum of the DC bias voltage and the AC acceleration signal voltage The AC coupling circuit extracts only the acceleration signal component from the signal and passes the resultant signal to the programmable gain amplifier In voltage measurement the voltage signal ...

Page 8: ...et the number of memory partitions Set the record length Set the number of acquisitions Number of memory block used Select the check box during continuous measurements only during the trigger mode Turn ON OFF waveform monitor Set the acceleration sensor sensitivity Switch to the window used for detailed configuration Turn ON OFF the supply current to the acceleration sensor Select the input coupli...

Page 9: ...the item being measured When measuring acceleration m S2 m s2 G When measuring voltage V Measurement Range Gain Two types of input signals can be measured acceleration and normal voltage You can select from the following measurement ranges gain Acceleration Measurement Gain Setting Note 1 Corresponds to the 5 V range of voltage measurement 2 Corresponds to the 2 5 V range of voltage measurement 5 ...

Page 10: ...nnel mode the record length For example if the channel mode is 2CH and the record length is 10000 the calculation is 4 194 304 2 10000 which is approximately 210 In this case the optimal number of partitions is 128 Thus if the number of acquisitions is less than or equal to 64 the Repeat check box appears If it is larger than 64 the check box does not appear If the optimal value exceeds 256 the nu...

Page 11: ... memory partitions when the number of measurement channels is 1 2 and 3 or 4 respectively The record length is set to Maximum record length the number of memory partitions when 0 is specified in the trigger mode The range during the gate level mode is 2 to the maximum record length The record length is set to the Maximum record length when 0 is specified in the gate level mode In this case the mem...

Page 12: ...length the number of measurement channels exceeds 4M points only the last 4M record length the number of measurement channels blocks of measured data are saved When the number of measure ment channels is 3 it is considered to be 4 If the specified record length is greater than or equal to the maximum record length 2 in the gate mode you can only specify 1 for the number of acquisitions You can set...

Page 13: ...conditions specified for the input signal of each channel is satisfied AND trigger The trigger occurs when all of the trigger conditions specified for the input signal of each channel are satisfied Pretrigger valid only during trigger mode You can acquire the measured data before the trigger point into the acquisition memory Set how many points before the trigger point to begin the acquisition in ...

Page 14: ...umber limit You specify the number of files and the data are saved up to the specified number and then the operation stops During Free Run Mode You can select to save the data to one file or to multiple files such as by specifying the number of data points Converting Waveform Data Waveform data that are saved can be converted to ASCII data in CSV format csv or to a physical value in 32 bit floatin...

Page 15: ... the bus trigger signal remains True is longer than the hold off period the next acquisition starts after the hold off period Bus trigger signal BUSTRG If the bus trigger becomes True during this period trigger is considered to have occurred during this sampling Timing at which the WE7235 detects the trigger 1st time 2nd time 3rd time Hold off Time base signal TB TB Time base time In addition the ...

Page 16: ...e in the trigger source time base source arming setting dialog box clicking Start on the operation panel causes the module to enter the arming signal wait state The measurement starts when the arming signal becomes True If the Repeat check box of the Start button is selected the module enters the arming signal wait state after each measurement When the arming signal becomes True again the module a...

Page 17: ...mes and Function of Sections Front Panel Input connector BNC terminal used to input the signal to be measured Sampling indicator Turns ON when the input signal is sampled START INPUTS CH1 CH2 CH3 CH4 60Vpk CAT 4 CH 100kS s ACCELEROMETER 1M ...

Page 18: ...grounding of the measurement module provided by the power cord is compromised and may cause electric shock CAUTION To avoid damaging the instrument when installing or removing modules make sure to turn OFF the standby power switch of the measuring station Be careful not to get your fingers caught in the ejection lever when inserting the module In addition do not put your hand inside the slot becau...

Page 19: ...o the Measuring Station When removing the module Module attachment screw Module attachment screw Ejection lever Note When synchronizing accelerometer modules for measurement module linking install the multiple accelerometer modules in adjacent slots ...

Page 20: ...ensors being used Connect acceleration sensors with the supply current bias to them turned OFF After connection turn ON the supply current to the acceleration sensors for making measurements When Connecting Charge Output Type Acceleration Sensors Since the charge output type high impedance acceleration sensors do not have built in amplifier circuit they cannot be directly connected to the WE7235 U...

Page 21: ...The WE7235 measures the signals in the acceleration measurement mode and supplies current bias to the charge converter Set the input sensitivity of the WE7235 according to the charge converter gain and the sensitivity of the charge output type acceleration sensor WE7235 Acceleration measurement Charge output type acceleration sensor Normal coaxial cable Highly isolated low noise cable Charge conve...

Page 22: ...nt panel of the module The input signal must conform to the following Number of inputs 4 Input format Non isolated unbalanced Input impedance Approx 1 MΩ Maximum input voltage 60 V DC ACpeak Overvoltage Category CAT I and II Acceleration sensor Built in amplifier type Sensor supply current 4 mA 10 Sensor supply voltage Approx 21 V CAUTION Applying a voltage exceeding the maximum input voltage indi...

Page 23: ...cted properly to the 2 3 to 2 5 acquired BNC terminals Noise enters the input signal If the signal line and the AC power supply line are close to each other move them apart Also make sure that the signal line is away from the noise source Change to a shielded signal cable if you are not already using one If the frequency of the input signal is known remove the frequency 1 4 region above the freque...

Page 24: ... Executing the Test Check that the acceleration sensor is connected to the terminal The test cannot be performed while measurement is in progress 1 Click More Option on the operation panel and select the On check box under Connection Test The displayed screen switches to the test mode Check that the check boxes for the channels being tested are selected Select the check box 2 Check that the On che...

Page 25: ...e Result box Normal Short Open The result of the connection test is determined by the input voltage measured when the supply current to the acceleration sensor is turned ON as follows Normal Input voltage between 2 V and 20 V Open Input voltage greater than 20 V Short Input voltage less than 2 V If you remove the On check box under Connection Test the WE7235 returns to normal measurement ...

Page 26: ... Self Test 1 Select Self Test from the System menu of the WE7000 Control Software 2 In the Self Test dialog box that appears select the station name and enter the slot number corresponding to the module and click Execute Executing is displayed in the Result display box Verifying Test Results If a value other than 0 is displayed in the Result display box of the Self Test dialog box the module is pr...

Page 27: ...ntenance of Parts There are no parts in this module that require periodic replacement Calibration We recommend that you calibrate the measurement module once a year to assure its measurement accuracy Please contact your nearest YOKOGAWA dealer to have the module calibrated ...

Page 28: ...kHz 1 5 dB typical value 1 During AC coupling 0 1 Hz to 40 kHz 1 5 dB typical value 1 Input Filter Low pass Filter Characteristics 4th order Butterworth 24 dB oct Cut off frequency 40 Hz 100 Hz 400 Hz 1 kHz 4 kHz 10 kHz 40 kHz 3 dB typical value 1 Anti Aliasing Filter Characteristics 8th order Cauer Cut off frequency 20 Hz 40 Hz 80 Hz 200 Hz 400 Hz 800 Hz 2 kHz 4 kHz 8 kHz 20 kHz 40 kHz Pass band ...

Page 29: ... C 100 mV 0 15 of rdg 0 5 mV 90 ppm 25 µV C 250 mV 0 15 of rdg 0 5 mV 90 ppm 40 µV C 500 mV 0 05 of rdg 0 5 mV 80 ppm 40 µV C 1 V 0 05 of rdg 0 7 mV 80 ppm 50 µV C 2 5 V 0 05 of rdg 1 8 mV 80 ppm 100 µV C 5 V 0 05 of rdg 3 5 mV 80 ppm 200 µV C 10 V 0 05 of rdg 7 mV 95ppm 500 µV C 25 V 0 05 of rdg 18 mV 95 ppm 1 mV C 50 V 0 05 of rdg 35 mV 95 ppm 2 mV C Measurement range and AC accuracy when filter...

Page 30: ...the measuring station Bus Trigger BUSTRG1 BUSTRG2 Signal Output Source The trigger detected from the input signal can be output Trigger Level Resolution When measuring acceleration 1 of the full scale value selectable range 100 to 100 When measuring voltage Measurement Range Resolution 50 mV 0 1 mV 100 mV 1 mV 250 mV 1 mV 500 mV 1 mV 1 V 10 mV 2 5 V 10 mV 5 V 10 mV 10 V 100 mV 25 V 100 mV 50 V 100...

Page 31: ...mV Unit Acquisition Mode Triggered Sampling Interval 0 000010 s Memory Partition 1 Record Length 1000 No of Acquisitions 1 AAF anti aliasing filter Off CH1 to CH4 Filter input filter Off CH1 to CH4 Trig Type Rise CH1 Off CH2 to CH4 Trig Level 0 Trig Source Internal Trig Combination OR Pretrigger 0 samples Hold Off 1000 samples Time Base Internal CH Mode Number of measurement channels 4CH Overlappe...

Page 32: ... Emission Complying Standard EN55011 Group 1 Class A This product is a Class A for industrial environment product Operation of this product in a residential area may cause radio interference in which case the user is required to correct the interference Immunity Complying Standard EN61326 Industrial Environment Testing Condition Connect with the 3 m coaxial cable 3D2W Maximum Measuring Input Cable...

Page 33: ...sions Unit mm WE7235 4 CH 100 kS s Accelerometer Module 33 242 4 227 4 5 START INPUTS CH1 CH2 CH3 CH4 60Vpk CAT 4 CH 100kS s ACCELEROMETER 1M If not specified the tolerance is 3 However in cases of less than 10 mm the tolerance is 0 3 mm ...

Page 34: ...el 1 11 G Gain 1 3 Gate Edge 1 4 Gate Level 1 4 H High 1 7 Hold Off 1 7 I Input Coupling 1 3 Input Filter 1 4 Input Output of Bus Trigger Signals 1 9 Input Output of Time Base Signals 1 9 Internal 1 7 L Low 1 7 M Manual Trigger 1 7 Measurement Range 1 3 Measurement Unit 1 3 Memory Partition 1 5 MODEL 2 N NO 2 No of Acquisitions 1 5 Number of Measurement Channels 1 6 O Off 1 7 Open 3 3 OR trigger 1...

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