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WA-1100 & WA-1600 Wavemeter Operating Manual

Appendix D Rear Panel Controls

08115-M-00 Rev E

D-1

Appendix D. Rear Panel Controls

GPIB Port

The instrument has a GPIB communications port on the back panel as shown in Figure
D-1. The GPIB port uses the standard IEEE-488 connector, with the pinout described in
Table D-1.

Figure D-1. GPIB Interface Connector

Table D-1. Standard IEEE-488 Connector Pinout

Pin

Number

Signal

Name

Pin

Number

Signal

Name

DIO1

DIO5

DIO2

DIO6

DIO3

DIO7

DIO4

DIO8

EOI

REN

DAV

GND (TW W/ DAV)

NRFD

GND (TW W/ NRFD)

NDAC

GND (TW W/ NDAC)

IFC

GND (TW W/ FC)

SRQ

GND (TW W/ SRQ)

ATN

GND (TW W/ ATN)

SHIELD

SIGNAL GROUND

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Содержание Burleigh Wavemeter WA-1100

Страница 1: ...l service in house repair center WE BUY USED EQUIPMENT Sell your excess underutilized and idle used equipment We also offer credit for buy backs and trade ins www artisantg com WeBuyEquipment REMOTE INSPECTION Remotely inspect equipment before purchasing with our interactive website at www instraview com LOOKING FOR MORE INFORMATION Visit us on the web at www artisantg com for more information on ...

Страница 2: ...5 M 00 Rev E Copyright EXFO Burleigh Products Group Inc 2002 All Rights Reserved Wavemeter is a registered trademark of Burleigh Instruments Inc an EXFO company Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com ...

Страница 3: ...Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com ...

Страница 4: ...e Screens 2 2 Change Parameter Values 2 2 Save Parameter Values 2 2 Restore Saved Parameter Values 2 3 Display Screens 2 3 Setup Screens 2 5 3 Remote Communications 3 1 Overview 3 1 GPIB System Controller Settings 3 1 SCPI Communications Scheme 3 2 SCPI Command Detail 3 6 Common Commands 3 6 Measurement Instructions 3 9 CALCulate Subsystem 3 11 DISPlay Subsystem 3 14 SENSe Subsystem 3 16 STATus Su...

Страница 5: ...RS 232 Serial Interface Connector D 2 Signal Monitor Connector D 3 Declaration of Conformity Assumptions This Operating Manual provides information for individuals who use the WA 1100 and WA 1600 Unless specifically stated the information in this manual applies to both the WA 1100 and WA 1600 This manual assumes familiarity with communication software and hardware interfaces with an IBM or compati...

Страница 6: ...esign permits these instruments to be less susceptible to misalignment more robust faster and less expensive than the previous generation of WA 1100 1600 and competitive instruments Both the WA 1100 and WA 1600 products have microprocessor based electronics that allow accurate counting and analysis of interference fringes The microprocessor computation automatically corrects for the refractive ind...

Страница 7: ...S PRODUCT IN A NORMAL MODE AND SHOULD NOT DEVIATE FROM THE WRITTEN INSTRUCTIONS PROVIDED WARNING THERE ARE NO OPERATOR SERVICEABLE PARTS INSIDE REFER SERVICING TO QUALIFIED PERSONNEL TO PREVENT ELECTRICAL SHOCK DO NOT OPEN OR REMOVE COVERS WARNING TO PREVENT ELECTRICAL SHOCK TURN OFF THE POWER TO THE INSTRUMENT BEFORE CLEANING USE A DRY OR SLIGHTLY DAMPENED WITH WATER CLOTH TO CLEAN THE EXTERNAL P...

Страница 8: ...il the reference laser inside the WA 1600 is stabilized Typical laser warm up time is approximately 6 minutes WA 1600 only 4 Ensure all fiber optic connectors are clean and dry see below Then connect your fiber optic cable to the fiber optic connector on the instrument front panel Make sure the fiber end does not rub against any surface and do not overtighten CAUTION Use care in handling fiber opt...

Страница 9: ...opyl alcohol 2 Dry it by wiping gently with a clean dry lint free lens paper 3 As soon as the connector is dry insert it in the panel or cover it for later use Cleaning a Universal Connector NOTE Refer to the illustration below To clean the end of the Universal Connector 1 Unscrew the fiber from the Instrument and put a protective cap on it 2 Close the Universal protective fiber cap 3 Gently push ...

Страница 10: ...ng to keep out dust This filter should be cleaned periodically especially if it becomes noticeably dirty To clean the dust filter 1 Pry off the plastic grill covering the filter with a small screwdriver 2 Use a small brush plus soap and water if necessary to clean the filter 3 When the filter is dry reposition it and snap the grill back in place Artisan Technology Group Quality Instrumentation Gua...

Страница 11: ...WA 1100 WA 1600 Wavemeter Operating Manual 1 Introduction 1 6 08115 M 00 Rev E Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com ...

Страница 12: ...ront Panel Controls Control Description power Switch turns the Instrument on and off LED Indicator shows the power status When lit the unit is turned on when not lit the unit is off display Button cycles through the display screens Main Wavelength and Power Display screens contain parameters you can review and select as well as calculated or measured data for review only Refer to Display Informati...

Страница 13: ...the parameters on each display screen To change a parameter value or status press select to highlight the parameter field then press or The parameter s value or status changes NOTE If the message Remote Lockout is displayed on the screen when you attempt to change a parameter value remote communications is enabled On When enabled you can use the front panel controls to review all parameter values ...

Страница 14: ...the current wavelength and power and pertinent parameter values For WA 1600s only if the warm up time is greater than 59 minutes an exception occurs which causes the wavelength to not be displayed yet all system functions are active Typical warm up time at room temperature 20 C is less than seven minutes Wavelength Displays wavelength information and two methods of calculating delta for a comparat...

Страница 15: ...average between Off and the numeric value set using the Measurement setup screen Off Indicates averaging is not used Numeric value 2 4 8 16 32 64 or 128 Change the numeric value on the Measurement setup screen Gain Displays the gain option used when measuring the wavelength and power Change the gain status on the Main display and Measurement setup screens Auto Permits the system to adjust the gain...

Страница 16: ...can change the units on the Main or Wavelength display screen The units are nm cm 1 and GHz If an error has occurred this area displays a status message Refer to Appendix C for messages and corrective action Presence indicates that an exception has occurred Check the status screen or read the status byte see STB Command on page 3 7 Refer to Appendix C for messages and corrective action Setup Scree...

Страница 17: ...ou enter a power offset value equal to the amount of external attenuation the instrument automatically displays the correct power This is useful if the signal input power exceeds the maximum allowed input of 10 mW 10 dBm Change the offset value on the Main and Measurement setup screens Off indicates a power offset is not used 1 2 20 in dBm units You cannot change the units for the offset Gain Disp...

Страница 18: ...kout Off Permits changing all front panel controls RS 232 Enables On and disables Off communications via the RS 232 port Baud Identifies the baud rate for the RS 232 communications The selections are 1200 2400 4800 9600 and 19200 baud Handshaking Identifies the type of handshaking used for the RS 232 communications The selections are Hardware Xon Xoff software or None GPIB Enables On and disables ...

Страница 19: ...WA 1100 WA 1600 Wavemeter Operating Manual 2 Front Panel Communications 2 8 08115 M 00 Rev E Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com ...

Страница 20: ...essage termination and bus timing to communicate with the WA 1100 or WA 1600 Other settings may also work but these are the settings that we ve found to work the best Set EOI at End of Write Yes This causes the system controller to assert the EOI signal during the last byte of a message written to the instrument Set EOI With EOS on Write No The system controller should not assert the EOI signal wh...

Страница 21: ...ibes each command in detail Note indicates an optional argument indicates a choice from a set of arguments Table 3 3 SCPI Command Summary Group Command Description Common Commands These commands are defined by IEEE 488 2 and control some functions that are common to all IEEE 488 2 instruments CLS Clears all event registers and the error queue ESE Queries the bits in the standard event status enabl...

Страница 22: ... calculated values from the instrument In general calculated values are values derived from actual measurements CALCulate DATA POWer FREQuency WAVelength WNUMber Used to set the type of data retrieved from the calculate subsystem CALCulate DELTa STATe Queries if DELTa is to be calculated CALCulate DELTa STATe ON OFF Selects DELTa as the quantity to be calculated CALCulate DELTa METHod Queries the ...

Страница 23: ... DISPlay UNITs POWer DBM MICRowatts MILLiwatts Selects the power units used for display DISPlay UNITs WAVelength Queries the wavelength units used for display DISPlay UNITs WAVelength NM GHZ WNUMber Selects the wavelength units used for display SENSe Subsystem These commands are used to control factors which effect the way in which the measurements are taken SENSe AVERage Queries the amount of ave...

Страница 24: ...SYSTem ERRor Reads error strings from the Error Queue If the Error Queue has any entries the Error Queue bit is set in the Status Byte SYSTem HELP HEADers This query returns a list of all commands queries supported by the instrument SYSTem REMote This query checks if the front panel is enabled or not If ON the front panel is locked out SYSTem REMote ON OFF This command controls whether the front p...

Страница 25: ...Event Status Register Enable table below ESE integer mask from 0 to 255 Description The ESE event status enable command sets the bits in the event status enable register and enables the corresponding events in the event status register For each bit that is set equal to 1 it is enabled in the event status register ESR integer is an integer which is the sum of all of the bit values for those bits th...

Страница 26: ...t Error DDE 2 4 Query Error QYE 1 2 Not Used 0 1 Operation Complete OPC IDN Description The IDN identification number query returns a string value which contains the instrument type serial number and firmware version The third value is the instrument serial number The last value is the software version and will reflect the actual version number Query Response BURLEIGH WAVEMETER WA 1100 1001 1 0 OP...

Страница 27: ...Culate STARt STATe OFF DISPlay DIALog MAIN DISPlay RESolution AUTO DISPlay UNITs POWer DBM DISPlay UNITs WAVelength WAVelengh SENSe AVERage OFF SENSe MEDium VACuum SENSe POWeroffset OFF SENSe GAIN AUTO SYSTem REMote OFF UNIT POWer DBM SAV Description The SAV command saves instrument settings It is the same as using the Save All function through the display STB Description The STB status byte query...

Страница 28: ...owever if FETCh queries are made faster than the instrument s scan rate it is possible to get the same reading twice Old readings are indicated by a bit in the questionable status register MEASure and READ get a new reading after the next complete scan MEASure and READ guarantee that each reading returned is a new one However because MEASure and READ wait until after the next complete scan before ...

Страница 29: ...WNUMber FREQency Description Queries a reading of the given type from the measurement subsystem Query Response see below Examples see below Measurement Instruction Functions POWer Description Returns a power reading in either Watts or dBm as specified by the UNIT POWer function Query Response A numerical value in scientific notation ex 1 267E 001 Examples READ POW FETC POW ENVironment Description ...

Страница 30: ...escription Returns an input laser reading in units of GHz Query Response A numerical value in scientific notation ex 1 9367357E 005 The number of significant digits will be determined by the current resolution setting Resolution is set through the front panel or by using the DISPlay RESolution command Examples FETC FREQ MEAS FREQ CALCulate Subsystem Use the CALCulate subsystem to read and control ...

Страница 31: ...tion ex 1 62E 000 The number of significant digits for a FREQuency WAVelength or WNUMber reading will be determined by the current resolution setting Resolution is set through the front panel or by using the DISPlay RESolution command Examples CALC DATA POW CALC DATA WAV DELTa STATe Description Queries the state of the DELTa function Query Response 0 1 Where 0 indicates OFF and 1 indicates ON Exam...

Страница 32: ...F RST value OFF Examples CALC MAX ON CALC MAX STAT OFF MINimum STATe Description Queries the state of the MINimum function Query Response 0 1 Where 0 indicates OFF and 1 indicates ON Examples CALC MIN CALC MIN STAT MINimum STATe ON OFF Description Sets the state of the MINimum function to either ON or OFF RST value OFF Examples CALC MIN ON CALC MIN STAT OFF RESet Description Resets the minimum max...

Страница 33: ...ue OFF Examples CALC STAR ON CALC STAR STAT OFF TIMe ELAPsed Description Queries the elapsed time since the instrument was turned on or was reset Query Response A time in HH MM SS format Examples CALC TIM CALC TIM ELAP DISPlay Subsystem The DISPlay subsystem is used to manipulate the instrument s front panel through the serial or GPIB SCPI interface These commands do not affect the readings from t...

Страница 34: ... RESolution Description Queries the current resolution of the instrument Query Response AUTO 0 0001 0 001 0 01 0 1 1 0 10 0 100 0 Examples DISP RES RESolution AUTO 0 0001 0 001 0 01 0 1 1 0 10 0 100 0 Description Sets the resolution for wavelength frequency and wavenumber readings It is the same as using the Resolution function through the display The 0 0001 setting is valid only for the WA 1600 i...

Страница 35: ...CR DISP UNIT POW DBM UNITs WAVelength Description Queries the units being used for wavelength values on the front panel display Query Response NM GHZ WNUMBER Examples DISP UNIT WAV UNITs WAVelength NM GHZ WNUMber Description Sets the units being used for wavelength values on the front panel display It is the same as changing the wavelength units through the display RST value NM Examples DISP UNIT ...

Страница 36: ...OFF Examples SENS AVER OFF SENS AVER 8 MEDium Description Queries the medium used for wavelength calculations Query Response AIR VACUUM Examples SENS MED MEDium AIR VACuum Description Sets the medium used for wavelength calculations It is the same as using the Medium function through the display RST value VAC Examples SENS MED AIR SENS MED VAC POWeroffset Description Queries the power offset being...

Страница 37: ...IN GAIN AUTo FIXed Description Sets the gain state of the instrument s fringe amplifier It is the same as using the Gain function through the display RST value AUTO Examples SENS GAIN AUTo SENS GAIN FIX REFerence PARameters Description Queries the reference laser status Query Response For the WA 1600 power in µW of peak power and minutes to warm up are returned separated by commas ex 267 0 UW 76 7...

Страница 38: ...types are of questionable accuracy The bits in the register are described in the table below Query Response An integer which is the sum of the bit values for all bits in the register that are set Examples STAT QUES COND Questionable Register Bit Bit Value Description 0 1 The wavelength has already been read for the current scan 1 2 not used 2 4 not used 3 8 The power value is outside the valid ran...

Страница 39: ...tionable HARDware CONDition Description Queries the SCPI Questionable Hardware Condition register which contains bits that indicate that one or more hardware problems exist These problems may contribute to invalid or erred measurements The bits in the register are described in the table below Query Response An integer which is the sum of the bit values for all bits in the register that are set Exa...

Страница 40: ...any entries the Error Queue bit is set in the Status Byte The instrument has a 30 entry first in first out queue Repeatedly sending the query SYST ERR returns the error numbers and descriptions in the order in which they occurred until the queue is empty Any further queries return 0 No error until another error occurs A table of possible errors is shown below Query Response integer string ex 104 D...

Страница 41: ...hen the state is ON front panel input is locked out and the instrument can only be operated remotely using SCPI commands RST value OFF Examples SYST REM ON SYST REM OFF VERSion Description Returns the version of the SCPI specification that the instrument s SCPI interface is based on The first integer is the year and the second integer is the approved revision number for that year Query Response in...

Страница 42: ...he UNIT subsystem They query and change the units that the SCPI interface uses for reporting power UNIT Subsystem Functions UNIT POWer Description Queries the state of the power units that will be used when the SCPI interface returns power values Query Response DBM W Examples UNIT POW UNIT POWer DBM W Description Sets the state of the power units that will be used when the SCPI interface returns p...

Страница 43: ...WA 1100 WA 1600 Wavemeter Operating Manual 3 Remote Communications 3 24 08115 M 00 Rev E Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com ...

Страница 44: ...odetector depends on the relative lengths of the two paths which govern whether constructive or destructive interference occurs at the beamsplitter As the retro reflector moves back and forth the detected intensity varies sinusoidally If the retro reflector assembly moves a distance d the number of fringes produced is given by the equation d n m λ λ 4 where m is the number of fringes generated by ...

Страница 45: ...ment depends fundamentally on the absolute accuracy of the reference laser but several other factors can affect the accuracy of the measured wavelength Fringe counting resolution Computing a wavelength with high accuracy requires that the precision in the numerator and denominator of the count ratio mo m is statistically sufficient For the count ratio to have high precision the number of fringes c...

Страница 46: ...small apertures are incorporated in the WA 1100 and WA 1600 that would introduce diffraction errors greater than 1 part in 107 for any of the wavelength ranges Coherence In order to achieve a high accuracy wavelength measurement the bandwidth of the laser radiation must be narrow This is because the generation of interference fringes by a Michelson interferometer is dependent upon the coherence le...

Страница 47: ...er a Window occurs that includes the ZOP point no further Windows will be generated When multiple Windows occur such as in Figure 4 3 only one Valid Window that includes the ZOP point is used in the measurement A narrow linewidth laser produces fringes throughout the entire Trigger interval as shown in Figure 4 3 In this case the Window interval is the maximum length allowed by the Trigger interva...

Страница 48: ...oses Fringe Signal Laser Spectrum Bi modal Trigger ZOP Window Valid Window Figure 4 3 Fringe signal and measurement window for a bi modal input laser When the number of fringes is reduced by increased bandwidth or lack of coherence in the laser source the accuracy of the wavelength measurement is also reduced Typically an increased bandwidth limits the accuracy of measurement to about 10 of the la...

Страница 49: ...ds of Acetylene JOSA B 13 2708 1996 using an absorption line of Rubidium as the reference standard The absorption line along with the laser s frequency locking circuit has been characterized to provide accuracy verification to within the limits required to verify the average wavelength reading to the accuracy specified for each model Calibration As described earlier accuracy is assured by the buil...

Страница 50: ...eneral Design Scanning Michelson interferometer design Input Fiber Optic Coupler FC APC standard Wavelength Range 700 1700 nm Measurement Rate 10 per second 1 per second Temperature Range 15 30 C ambient temperature Pressure Range 500 900 mm Hg Dimensions 417 mm 356 mm 89 mm Communications Interface RS 232 and IEEE 488 2 standard Electrical Power Consumption 45 Watts at 110 V 60 Watts at 110 V Wei...

Страница 51: ...ts as shown below When the WA 1100 1600 is mounted in an enclosed rack be careful not to block the fan on the rear panel and provide adequate ventilation inside the rack to prevent overheating For proper fit you may want to remove the feet under the chassis CAUTION If you remove the feet DO NOT reinsert the screws or damage to the internal components of the wavemeter can occur Artisan Technology G...

Страница 52: ...turning a unit for a Return Authorization Number RA This will ensure the prompt handling of the repair as well as provide important tracking information The liability of EXFO except as to title arising out of supplying of said product or its use whether under the foregoing warranty a claim of negligence or otherwise shall not in any case exceed the cost of correcting defects in the products as her...

Страница 53: ...WA 1100 WA 1600 Wavemeter Operating Manual Appendix B Warranty Service B 2 08115 M 00 Rev E Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com ...

Страница 54: ... cases Error Messages will prevent data from being reported These are displayed in the Display Screens The error messages will also be reported as Status Messages that will be reported in the Status Screen or can be queried through remote communications Some other status messages may not prevent data from being reported and indicate that there may be unusual operation of the laser under test and a...

Страница 55: ...ll restart the warm up timer If this condition occurs after initial warm up then contact EXFO Service 00000001 Scan Engine No Trigger Interferometer scan motion error Either the scan assembly is not moving or the scan timing detector is malfunctioning Contact EXFO Service 00000080 Temperature Pressure Sensor Out of Range The pressure or temperature reading is out of range the normal pressure range...

Страница 56: ...ignal from the reference laser during the measurement window Reference laser signal at the Monitor output should exceed 2 0 volts p p throughout the measurement window This may be due to partial misalignment of the instrument internal optics 00000020 EEPROM read failure Problem occurs on power up or when restoring Turn the instrument off wait a few moments and turn the instrument back on If the pr...

Страница 57: ...nt is out of the range for the model setting Check that the laser is operating within the specified wavelength range 700 1700 nm 00010000 Power Null failure The background power reading is above the threshold for the power null function Make sure an input laser is removed from the instrument and the fiber connector cap is on 00040000 WA 1600 only reference laser peak power outside of 70 80 range n...

Страница 58: ...pinout described in Table D 1 Figure D 1 GPIB Interface Connector Table D 1 Standard IEEE 488 Connector Pinout Pin Number Signal Name Pin Number Signal Name 1 DIO1 13 DIO5 2 DIO2 14 DIO6 3 DIO3 15 DIO7 4 DIO4 16 DIO8 5 EOI 17 REN 6 DAV 18 GND TW W DAV 7 NRFD 19 GND TW W NRFD 8 NDAC 20 GND TW W NDAC 9 IFC 21 GND TW W FC 10 SRQ 22 GND TW W SRQ 11 ATN 23 GND TW W ATN 12 SHIELD 24 SIGNAL GROUND Artisa...

Страница 59: ...Data Data from the instrument is output on this signal pin 3 RxD User Receive Data Data from the user is received on this signal pin 4 DSR User Data Set Ready This input signal must be held active by the user for the instrument to consider the serial port connected to an external device 5 GND Signal Ground Required for proper RS 232 operation 6 DTR WA 1100 1600 Data Terminal Ready This output sign...

Страница 60: ... Monitor output is a 15 pin female D sub style connector shown in Figure D 1 and with the pinout described in Table D 2 Examples of these signals for different input laser characteristics are described and shown in Section 4 of this manual Table D 3 Signal Monitor Characteristics Analog Signals Digital TTL Signals Output Voltage 7 V maximum VOL 0 4V max VOH 2 4V min Output Current 100 mA maximum I...

Страница 61: ...ived from the interferometer scanner that produces a low to high transition at the point in the scan where the difference between the two optical paths in the interferometer is zero 9 AGND Analog Ground 10 AGND Analog Ground 11 N C 12 N C 13 N C 14 DGND Digital Ground 15 WINDOW TTL Scanning Window digital output is derived from the amplitude of the input laser fringe signal When the p p amplitude ...

Страница 62: ...ument 2 1 screens 2 3 DISPLAY Button 2 1 E Error Message 2 4 error messages C 1 F Fan Filter Cleaning 1 4 Fiber End Cleaning 1 3 Fiber Optic Connector 1 3 Fixed gain 2 4 2 5 front panel 2 1 G Gain 2 4 2 5 GPIB connector D 1 enable disable 2 6 H Handshaking 2 6 I IEEE 488 D 1 Information setup screen 2 5 L laser power current 2 4 lockout See Remote Lockout M Main display screen 2 3 Mediium 2 4 moni...

Страница 63: ...tton 2 1 Setup screens 2 5 signal GPIB D 1 monitor D 2 RS 232 D 2 specifications A 1 standard air 2 4 Status screen 2 5 U units See specific parameter s units Universal Connector 1 3 V vacuum 2 4 Vacuum 2 4 W warranty B 1 Wavelength current 2 4 display screen 2 3 X Xon Xoff 2 6 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com ...

Страница 64: ...Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com ...

Страница 65: ...ity 2kV CD 2kV AD IEC 1000 4 3 RFI Immunity 3V m 27 500 MHz Class II IEC 1000 4 4 Electrical Fast Transient Immunity 0 5 kV IEC 1000 4 5 High Voltage Surge Immunity 0 5 kV Supplementary Information The product complies with the requirements of the Low Voltage Directive 73 23 EEC and the EMC Directive 89 336 EEC European Sales Office Scientifica Ltd 9 Allied Business Center Coldharbour Lane Harpend...

Страница 66: ... Products Group Inc 7647 Main Street Fishers Victor NY 14564 8909 Tel 585 924 9355 Fax 585 924 9072 WA1100 1600 08115 M 00 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com ...

Страница 67: ...l service in house repair center WE BUY USED EQUIPMENT Sell your excess underutilized and idle used equipment We also offer credit for buy backs and trade ins www artisantg com WeBuyEquipment REMOTE INSPECTION Remotely inspect equipment before purchasing with our interactive website at www instraview com LOOKING FOR MORE INFORMATION Visit us on the web at www artisantg com for more information on ...

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