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1-6

IM 707235-01E

If you set a number less than the number of memory partitions in the trigger mode, you

will have to specify the number of memory blocks to use.  If you set a number larger than

the number of memory partitions, the data is acquired until the specified number is

reached or until the specified record length is reached.

In the gate mode, measured data is acquired by taking the specified record length to be

one block.  When the specified record length is “maximum record length/256” or less and

the number of acquisitions is set to 256 or less, all of the acquired data are saved.

However, if the number of acquisition is set above 256, the acquired data beyond the

256

th

 acquisition overwrites the previous data starting from the first acquisition.  If the

record length is set above “maximum record length/256” points, the data is overwritten

when the number of acquisitions exceeds (maximum record length/specified record

length).

Note

• If the number of acquisitions is greater than the number of memory partitions in the trigger

mode, only the last “number of memory partitions” blocks of measured data are saved.  In

addition, you can only specify 1 for the number of acquisitions if the number of memory

partitions is set to 1.

• If (the number of acquisitions 

×

 record length 

×

 the number of measurement channels

*

) is “4M”

points or less, and the number of acquisitions exceeds 256, then only the last 256 blocks of

measured data are saved.  If (the number of acquisitions 

×

 record 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 0 by using the WE Control API (sold separately, model: 707741).  If you select 0,

the acquisition of data continues until the measurement is stopped or the specified record

length of data is acquired.  This function is not supported on the WE7000 Control Software.  For

details, see the WE Control API User’s Manual (IM707741-61E).

Number of Measurement Channels (CH Mode)

The maximum record length can be changed by restricting the number of measurement

channels.  The number of measurement channels can be set to 4 channels (no

restriction), 2 channels, or 1 channel.  The maximum record length is set to 1 Mword for

4 channels, 2 Mwords for 2 channels, and 4 Mwords for 1 channel.

Time Base

You can select whether to sample the input signal with the specified sampling interval

based on the module’s internal clock or to sample with the time base signal (CMNCLK)

*

of the measuring station (BUSCLK setting).

*

For setting procedures, see section 4.6 “Setting the Trigger Source/Time Base/Arming” in the
WE7000 User’s Manual (IM707001-01E).

Note

You can set the time base for the FFT by using the WE Control API (sold separately, model:

707741).  This function is not supported on the WE7000 Control Software.  For details, see the

WE Control API User’s Manual (IM707741-61E).

1.3 Setting Measurement Conditions

Содержание WE7235

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

Страница 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 ...

Страница 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...

Страница 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...

Страница 5: ...4 IM 707231 01E ...

Страница 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...

Страница 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 ...

Страница 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...

Страница 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 ...

Страница 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...

Страница 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...

Страница 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...

Страница 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 ...

Страница 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...

Страница 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 ...

Страница 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...

Страница 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 ...

Страница 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...

Страница 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 ...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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 ...

Страница 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...

Страница 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 ...

Страница 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 ...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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 ...

Страница 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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