gohastings.com DAVC-4 User's Manual
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1. Fig 1 os IOLET ANALOG SIGNAL COMM i YELLO ESSURE SIGNAL OUT EE IER LACI ITAL LUE VER C HITE EIPOINT LEVEL RANGE ASE GROUND INI 2 TX 2 2 Power Requirements amp Pin Out Supply the DAVC with a well regulated 12 to 30 VDC power source capable of providing at least 0 5 Watts between Power pin 4 blue and Power Common pin 3 green See Fig 1 2 3 Serial Communications Pin Out The transmit line of the DAVC RS232 TX pin 15 pink must be connected to the receive pin of the serial connector on the computer and the receive line RS232 RX pin 14 tan must be connected to the transmit pin of the serial connector on the computer A third line Digital Common pin 8 black should join the common pins on both the computer and the DAVC RS 232 communication may be established with baud rates of 9600 or 19200 only The communication conditions of the DAVC are fixed at 8 data bits 1 stop bit no parity and no handshaking See the SERIAL COMMUNICATIONS subsection under OPERATION for the command set 2 4 Analog Output Pin Out An analog Pressure Signal output line pin 7 yellow supplies a 0 to 1 VDC signal corresponding to the output range of the selected tube This signal should be measured with respect to the Analog Signal Common at pin 6 violet 2 5 Pressure Alarms Pin Out A single pressure set point controls tw2. 0 01 4 0 001 x 0 0001 LLILLL LT 0 0 2 0 4 0 6 0 8 1 1 2 Voltage 174 082010_Digital AVC Page 11 of 17 3 3 Alarm Set point A single set point controls two open collector circuits Though not the mechanical relays the two circuits called Alarm 1 P gt SP and Alarm 2 P lt SP allow physical monitoring of the state of the vacuum with respect to the set point Alarm 1 P gt SP pin 1 gray is active when the red LED is ON indicating that the pressure is above the set point Alarm 2 P lt SP Pin 2 brown is active when the green LED is ON indicating that the pressure is below the set point The open collector circuits need to be supplied with their own power and current limiting resistance by the end user The load controlled by the Open Collector circuits must not require voltages higher than those specified for the DAVC 12 30 VDC AND must not exceed 500 mAmps of continuous current See the section on Pressure Alarms Pin Out for wiring instructions The alarm set point may be set in one of two ways One by the measuring the Voltage signal between Analog Signal Common Pin 6 violet and Setpoint Level Pin 5 white and setting the voltage using the SP potentiometer until the voltage corresponds to the pressure indicated on one of the Pressure Vs Voltage charts above Two by using the A2 command to send th
3. The simplest and quickest way of checking the operation and performance of a gauge and or gauge tube is to keep a new or known good gauge tube on hand for use as a reference To check operation install both the reference and suspect gauge tubes in a common vacuum system locate the gauge tubes as close as possible to each other then evacuate the system until a stable base pressure is obtained Alternately connect the vacuum gauge to each gauge tube and record its pressure readings If the gauge tube under test produces a significantly higher pressure reading than the reference gauge tube this indicates a calibration shift and is usually the result of contamination particulate oil or other chemical deposits You can try to restore calibration of the contaminated gauge tube by cleaning it internally with an appropriate solvent such as high purity isopropyl alcohol flood the interior cavity of gauge tube gently with solvent and allow it to stand and soak for about 15 to 30 minutes Drain the contaminated solvent and let gauge tube dry in ambient air until all of the cleaning solvent has evaporated To prevent mechanical damage to the thermopile elements do not use forced air to dry the gauge tube Gauge tubes that remain out of calibration after cleaning should be replaced ECT ABLE z TUBE S l M lt gt P a e l 2116 e E gt X PME PUT
4. ee 12 30 VDC RM 0 7 Watts Cable susu u REM Combination power and RS232 cable 1 5 meters included Mute ss ie For CE Compliance cable should never exceed 3 0 meters Weight Approx Nt 22 Oz s 624 Grams W O Tube amp Cable Height Length R k vaka 2 6 W O Tube amp Cable Width DIE 1 75 Operating temperature Range 20 C to 70 C Standard Metal Gauge DV 6R DV 5M DV 4R Overpressure Gauge tubes E oeil code veto ate ete 50 psig max Material of Construction DAVC Housing Aluminum P Thermocouple Glass Noble Metal Mene jog ee UN High Density 15 Pin D Connector c astawan Octal Tube Socket for Thermocouple Alan S eec DR 0 50 Amps max lt 1x10 atm cc sec See tube Product Bulletin for available tube connection configurations 174 082010_Digital AVC Page 4 of 17 1 3 Compliance data CE Standard Compliance Test Standard SAFETY EN61010 EMC EMI Family EN61326 CONDUCTED RADIATED EN55011 ESD EN61000 4 2 RF EN61000 4 3 CONDUCTED IMMUNITY EN61000 4 6 1 4 Safety The following symbols
5. and terms may be found on THI products and or in THI manuals and indicate important information When found on the device this symbol indicates that the operator should refer to the manual for important instructions on the proper use of this device When found in a manual this symbol indicates that the reader should understand the implications contained in the text before operating the device The WARNING label indicates important information that should be heeded for safe and proper performance of the device The label CAUTION is used to indicate that damage to the power supply or equipment connected to it could occur if directions are not followed Warranty could be invalidated if the instructions in this manual are not followed Accessories 1 4 1 Installation Accessories ATM gt SP SP HRAIM HI RED THI offers a complete line of system attachments that e e LOC CRN permit easy maintenance for contaminated operations lt Sp Gauge tubes are offered with various system fittings to match almost any system requirement Additionally THI s complete line of quick disconnect attachments allows customers to install these special fittings and easily replace sensors without vacuum sealant or Teflon tape For particularly dirty systems Hastings offers a particle dropout trap containing a series of nine separate baffles which prevent solid contaminants from having a direct path to the sensor s the
6. the appropriate tube corresponding to the set up of the DAVC is connected to the unit 3 Power the DAVC with a DC supply capable of providing from 12 to 30 Volts DC and at least 0 5 Amps 4 Using a pointed object such as a ballpoint pen press and hold the ATM push button located on the top cover until the two LEDS are on continuously approximately 3 seconds This deletes any previously stored data 3 7 2 Set High End NOTE TUBE MUST BE AT ATMOSPHERE TO PROPERLY SET THE HIGH END While at one atmosphere press the ATM button and release to set the atmosphere tube output for this individual tube The LEDS will flash while the button is pressed Push the button only as long as it takes the LED s to blink one or twice Holding the button longer than 3 seconds will reset the adjustment back to the default value The high end setting is now set 3 7 3 Set Low End W Vacuum System NOTE The LOW END can be adjusted by either bringing the system to a known vacuum or by using a HASTINGS REFERENCE TUBE see below A Setsystem to known vacuum B Turn the HTR potentiometer on the top panel until the either the voltage measured between pins 6 Analog Signal Common violet and 7 Pressure Signal Output yellow reads the voltage corresponding to the pressure as read on the Pressure Vs Voltage chart for the tube being measured or if using serial communication until the proper pressure is read while using the streaming P1 command
7. 2 1515 SUO 2140 ANALOG en pocsenen 216 TPUT POM 2 114 pe l Y SIGNAL A RUCE TUBE PARTIAL CI IT E 174 082010_Digital AVC Page 14 of 17 3 6 Gauge Tube Operating Principle Operation of the Hastings gauge tube is based on a low voltage AC bridge that heats a noble metal thermopile A change in pressure in the gauge tube changes the molecular collision rate and therefore the thermal conduction of the gas or gas mixture surrounding the thermopile This results in a temperature shift in the AC heated thermocouples A and B Fig 6 The resultant temperature shift causes a change in the DC output from couples A and B inversely with pressure changes The DC thermocouple C when installed is in series with the circuit load Thermocouple C provides compensation for transient changes in ambient temperature 3 7 Calibration Procedure NOTE ONCE CALIBRATION IS COMPLETE THE CALIBRATION DATA IS PERMANENTLY STORED IN NON VOLATILE MEMORY A LOSS OF POWER WILL NOT ERASE THE CALIBRATION DATA TO ERASE THE CALIBRATION DATA REFER TO STEP 2 3 7 1 Preparation 1 The following procedures be carried out on a unit installed in a vacuum system as long as a calibrated reference meter is installed in the same system in close proximity to the unit being calibrated 2 The following procedure assumes that the appropriate DV4 DV5 or DV6 gauge tube See the bottom of the instrument to determine
8. 4 082010 Digital AVC Page 9 of 17 This signal is equal to an amplified tube millivolt signal This signal will NOT be linearly proportional to the indicated pressure 1 volt 1 2 for DAVC4 1 2V will correspond to a system pressure that is at least 1 order of magnitude less than the minimum detectable pressure Increasing pressure will be indicated by a decreasing voltage The minimum detectable pressure is 0 2 millitorr for DAVC 5 1 millitorr for DAVC 6 and 20 millitorr for DAVC 4 The voltage signal can be mapped to a pressure value by using the following equation 1 bV dV Where V Voltage P pressure in Torr for DV4 amp DV5 versions and millitorr for DV6 Parameters a D O oO 174 082010_Digital AVC DV6 1623 22 58 0442 11732 2 130 397 13338 17 DV4 5 10184 6 91233 4 4943 6 30995 9 563177 DAVC 4 1 2V 3 8115614 2 5905928 26 238798 22 881611 24 483441 DV5 0 25948 42 23869 2 92598 256 99510 3 18016 Page 10 of 17 Analog Output vs Pressure 100 uos a nm 15 DAVC6 ja DAVC4 10 VA DAVC4 1 2V N DAVC5 S in EE E ur 1 S PD ww x Ng 5 N N 2
9. C The low end is now adjusted 3 7 4 Set Low End W Reference Tube A Connect the THI reference tube 174 082010_Digital AVC Page 15 of 17 B Turn the potentiometer on the top panel until the either the voltage measured between pins 6 Analog Signal Common violet and 7 Pressure Signal Output yellow reads the voltage corresponding to the pressure as read on the Pressure Vs Voltage chart for the tube being measured or if using serial communication until the proper pressure is read while using the streaming P1 command C THE LOW END is now adjusted NOTE If re calibration is required you must repeat the High End adjustment first The following table specifies the THI reference tube to be used in the calibration of a gauge based upon the type of gauge tube being used Ref Tube Gauge Tube DB 16D DV 4 DB 18 DV 5 DB 20 DV 6 174 082010 Digital AVC Page 16 of 17 4 0 Warranty 4 1 Warranty Repair Policy Hastings Instruments warrants this product for a period of one year from the date of shipment to be free from defects in material and workmanship This warranty does not apply to defects or failures resulting from unauthorized modification misuse or mishandling of the product This warranty does not apply to batteries or other expendable parts nor to damage caused by leaking batteries or any similar occurrence This warranty does not apply to any instrument which has had a tamper seal removed or broken This warrant
10. INTERNET ADDRESS http www teledyne hi com Repair Forms may be obtained from the Information Desk section of the Hastings Instruments web site 174 082010_Digital AVC Page 17 of 17
11. NTY REPAIR ROOT 17 4 2 NON WARRANTY REPAIR POLICY Ne 17 174 082010_Digital AVC Page 3 of 17 General Information This manual contains technical and general information relating to the installation operation and calibration of vacuum gauges and gauge tubes manufactured by Teledyne Hastings Instruments THI For best performance THI vacuum gauges should be operated with the appropriate THI gauge tube Attempting to use a THI vacuum gauge with another manufacturer s tubes may result in damage to both the gauge and tube 1 1 Features The THI Digital AVC DAVC is a digital readout version of THI s AVC vacuum gauge The heated gauge tube supplies an analog signal that is amplified for a zero to one volt signal out put A precision A D converter in conjunction with a microprocessor measures the gauge tube s signal output converts the measurement to a pressure reading using the gauge tube s well defined output pressure function and then provides the result to the end user through a serial communications port The DAVC is available for use with two of THI s most popular gauge tube families The DV 6 and DV 4 The DV 6 range is 1 0 1000 mTorr The DV 4 range is 0 2 20 Torr All gauge tubes used with the Digital AVC feature long life and minimal maintenance due to the use of rugged noble metal thermocouple TC gauge tubes that are designed specifically for each range 12 Specifications Jp oe e ee eee eee
12. TELEDYNE HASTINGS INSTRUMENTS INSTRUCTION MANUAL DIGITAL AVC DAVC 4 DAVC 5 DAVC 6 236 TELEDYNE HASTINGS INSTRUMENTS C 150 9001 CERTIFIED Manual Print History The print history shown below lists the printing dates of all revisions and addenda created for this manual The revision level letter increases alphabetically as the manual undergoes subsequent updates Addenda which are released between revisions contain important change information that the user should incorporate immediately into the manual Addenda are numbered sequentially When a new revision is created all addenda associated with the previous revision of the manual are incorporated into the new revision of the manual Each new revision includes a revised copy of this print history page Revision A Document Number 174 062009 June 2009 Revision B Document Number 174 072009 July 2009 Revision C Document Number 174 072009 July 2009 Revision D Document Number 174 062010 June 2010 Revision E Document Number 174 082010 Visit www teledyne hi com for WEEE disposal guidance Hastings Instruments reserves the right to change or modify the design of its equipment without any obligation to provide notification of change or intent to change 174 082010 Digita
13. alling the gage tube consider the position of the keyed octal plug so that the LED s and controls on the DAVC will be readily accessible 2 Plug the gauge tube into the octal socket on the bottom of the Digital AVC 3 Connect power common to the blue wire pin 4 and from 12 VDC to 30 VDC supply to the green wire pin 3 One of the LED s indicating over pressure or under pressure on the top of the DAVC will illuminate 4 While at one atmosphere press the ATM button and release to set the atmosphere tube output for this individual tube The LEDS will flash while the button is pressed Holding the button longer than 3 seconds will reset the adjustment back to the default value 5 The low pressure accuracy can be improved if the vacuum chamber be pumped down below the minimum pressure range of the attached tube can be reached adjust the HTR potentiometer until that pressure reading is reported See the serial communication section or until the analog Pressure Signal Output pin 7 yellow equals approximately 1 0 Volts Refer to Section 3 7 for more information about tube calibration 3 2 Analog Pressure Measurement An analog Pressure Signal Output line pin 7 yellow supplies a 0 to 1 VDC signal corresponding to the output range of the selected tube This signal should be measured with respect to the Analog Signal Common line pin 6 violet See the INSTALLATION section for a diagram showing the Analog Signal pin out 17
14. e set point voltage to the A D converter in conjunction with a P1 command to enable streaming while the pot is set to the desired trigger pressure Remember to disable streaming by issuing a PO command and reset the signal source of the A D converter by issuing an AO command While the SP potentiometer is enabled using the PE command the value of the set point is read every thirty seconds and compared to its previous setting If the setting has changed the new setting will be stored to non volatile memory If the SP potentiometer is disabled using the PD command then no tweaking of the SP potentiometer will have any affect In either Enabled PE or Disabled PD cases using the S1 command will re write a new set point Only if the Potentiometer is Enabled using the PE command will adjustment of the potentiometer affect a previous set point 3 4 Digital Communications See the section on Serial Communications Pin Out for wiring instructions RS 232 communication may be established with baud rates of 9600 or 19200 only The communication parameters of the DAVC are fixed at 8 data bits 1 stop bit no parity and no handshaking The command set can be found in the table below Communication with the serial interface of the Digital AVC is via an ASCII data string The command message consists only of a command string and the terminator If all components of the ASCII data string are valid the command will be accepted and executed 3 4 1 Comma
15. f Pressure as the presently selected Units of Measurement i e Torr mbar or Pascal The data is only checked to be a valid number with a one 174 082010 Digital AVC Page 13 of 17 digit exponent before being accepted There are no limit checks on the data the user is free to choose any value appropriate to his use of the instrument If the command syntax is not met or if the number is out or range the Digital AVC will respond with the ASCII codes for lt bell gt lt CR gt and the command will be ignored 3 4 4 Reset Initialize Commands Command Description Format Notes Software Reset lt CR gt Reset instrument Does not reset or overwrite any parameters saved in non volatile memory EEPROM Autobaud lt ctrl z gt lt CR gt Match baud rate currently in use Device can run at 9600 or 19200 Baud Set terminal to 9600 N 8 1 or 19200 N 8 1 and type Ctrl Z The lt ctrl z gt is entered by holding down the Ctrl key while pressing the z key when using terminal emulator program This character has an ascii code of 26 decimal and 1A hexadecimal Device will respond with Device ID Digital AVC If this response is not generated repeat the Ctrl Z until it is The Baud rate will be stored in EEPROM and is remembered on the next power up 3 5 Operation and Performance The Digital AVC will function right out of the box For maximum accuracy refer to the Calibration section below and perform the calibration procedure
16. l AVC Page 2 of 17 Table of Contents 1 0 GENERATE INFORMA TION ZS dees sch a Si s edad a AER utu SE eat 4 1 1 FEATURES mu use e mie 4 1 2 N3 O N D ONN 4 1 3 GOMPEIANGEDAT A asa aa k amu uu usu ayy A 5 1 4 SABETDNY C hei Dac rite imei MAD b e E D uta 5 INGCESSORIES LE RM 5 2 0 INS TALUATION eese ect eere ET ehe vecti iet me eR SCARE SENE DN e CURE 7 2 1 PONVER IOGABLES nore A uci 7 2 2 POWER REQUIREMENTS amp PIN OUT asetad nr eneee aeaee ia eene 7 2 3 SERIAL COMMUNICATIONS PIN OUT RN 7 2 4 ANALOG OUTPUT PIN 22 200200 0 000 000 0000 ttrt t tettette esse ei 7 2 5 PRESSURE ALARMS PIN OUT eere earn ean d Perte ny iu a 7 3 0 Nri aa 9 3 1 5 go aaa es oda sya ds bya ese bla ayu a 9 3 2 ANALOG PRESSURE MEASUREMENT Ne 9 3 3 AT ARMISED POINT ts cas ti e DU ee aT BE a i 12 3 4 DIGITAL GOMMUNIGATIONS ua aa u Q usu u a 12 3 5 OPERATION AND PERFORMANCE pp 14 3 6 GAUGE TUBE OPERATING PRINGIPL apama etse aasan eese erede 15 3 7 CALIBRATION PROCEDURE s SH teu ec D e tus 15 4 0 WARRAN PY ti sles k TI 17 4 1 WARRA
17. nd Syntax In the following examples of syntax codes the special characters are explained The first characters in each row of the format column represent a command string either upper or lower case command characters accepted All characters must follow each other in the string with no spaces or other characters The characters within wavy brackets contain choices for the appropriate command The characters within the symbols are the common abbreviations for the one digit ASCII control codes which they represent e g CR represents carriage return All command strings must be followed by the terminator character carriage return CR also known as ENTER When a lower case character is present in an example it represents an option 174 082010 Digital AVC Page 12 of 17 Character Description Valid Inputs m Most Significant Digit Of Mantissa 1 9 d Decimal Digit 0 9 e Exponent 0 5 lt CR gt Command Terminator carriage return N A 3 4 2 Interrogation Commands Command Description Format Sample Response Get Device ID ID lt CR gt Digital AVC lt CR gt Get Current Pressure if 0 is set current Set Point P lt CR gt Pa 1 23456e 0 Torr lt CR gt if A2 is set heater potentiometer setting if A3 is set Get Relay Status RS lt CR gt 1 R1 O0N lt CR gt Get Setpoint S1 CR SP1 1 0240e 2 mbar CR Get Serial Number 10 character max SN lt CR gt 1023400012 lt CR gt Get Sensor Type ST lt CR gt DV 6 lt CR g
18. o open collector circuits Alarm 1 the over pressure condition is available through pin 1 gray and Alarm 2 the under pressure condition available through pin 2 brown The open collector circuits will need to be supplied with power and current limiting resistance by the end user The suggested circuit configuration is illustrated in Figure 2 The open collector circuits are limited to the Voltage limitations of the DAVC and the maximum continuous current should be limited to no more than 0 5 amps to avoid damage to the DAVC 174 082010 Digital AVC Page 7 of 17 DAVC 4 6 ALARM 1 DIGITAL COMMON V ALARM 2 12 30 VDC 3 VDC POWER SUPPLY P FOE COMMON DIGITAL COMMON EXTERNAL CIRCUIT Fig 2 Relay Hook Up 174 082010_Digital AVC Page 8 of 17 Vacuum Gauge Operation All THI gauge tubes are shipped with a protective cap or cover at the evacuation port to reduce contamination and prevent damage to the internal thermopile elements Once the protective cap or cover is removed a tube can be installed in any convenient position in the vacuum system without adversely affecting calibration or performance The recommended orientation is with the tube vertical and its stem down This will aide in preventing condensable materials from remaining in the gauge tube 3 1 Quick Start 1 Install the appropriate DV4 DV5 or DV6 gauge tube See the bottom of the instrument to determine the appropriate tube into the vacuum system When inst
19. rmopile 12 30 0 7 W 1 4 3 DV 6S New DV 6 tube For Severe Environments Hastings Instruments has developed a new gauge tube the DV 6S which is specifically designed for outdoor use on cryogenic tanks including railcar and tanker truck applications In addition to the DAVC the gauge tube is compatible with the hand held HPM 4 6 and the analog VT 6 The DV 6S is supplied with a protective cap The o ring sealed cap protects the gauge tube pins from moisture thus significantly reducing corrosion A metal lanyard prevents cap loss The tube is provided with a standard 1 8 NPT fitting however special fitting requests can often be met 174 082010 Digital AVC Page 5 of 17 1 4 3 Calibration Reference Tubes THI Reference Tubes employ the same metal thermopiles used in all THI Vacuum Gauge Tubes The thermopile is sealed in a glass capsule that has been evacuated baked out gassed and then aged to ensure long term stability The sealed capsule is then housed in a protective metal shell to provide a rugged trouble free assembly Once assembled the reference gauge tube is accurately calibrated to precisely simulate a gauge tube at a given operating pressure It provides quick and easy instrument re calibration by merely plugging the instrument and in the case of the DAVC adjusting the HTR potentiometer until the display reads the exact pressure noted on the reference tube 174 082010 Digital AVC Vac
20. t Get Raw Average Output Voltage No Offset U lt CR gt Vavg 1 23456e 1 Volts lt CR gt Get User Data 10 character max UD lt CR gt TextString lt CR gt Get Software Version V lt CR gt Digital CVT 1 1 0 lt CR gt 3 4 5 Parameter Modification Commands Command Description Format Response notes Select A D input 0 0 lt gt Read from gauge tube Select A D input 1 A1 lt CR gt none Read from Setpoint Potentiometer Select A D input 2 A2 lt CR gt none Read heater adjust potentiometer Data streaming Logging Off PO CR none Stops streaming output Data streaming Logging On P1 lt CR gt See P cmd Reports signal Voltage and pressure in Torr only Disable set point pot PD lt CR gt OK Lock out local setpoint adjustment Enable set point pot PE lt CR gt OK Enable local setpoint adjustment Modify Setpoint S1 m dd E e lt CR gt 1 00000e 9 to 9 99999e 9 Set units to Torr U1 lt CR gt OK All subsequent values in Torr Set units to Pascal U2 lt CR gt OK All subsequent values in Pascal Set units to Mbar U3 lt CR gt OK All subsequent values in mbar Modify User Data UD TextString lt CR gt 10 character maximum Notes The User Data is 10 digit text area reserved for use by the customer for identification purposes The setpoints may also be entered as a decimal number e g S1 0 760 lt CR gt will be same as entering H27 60E 1 CR When inputting setpoint data it should be entered in the same Units o
21. uum Gauge Tubes 1000 mTorr Range Stock Model Description 55 38 ved NPT Standard Yellow base 55 38R lover us Ruggedized 55 38RS ve us NPT Rohs Rugged 55 38S pv 6s 1 8 NPT Rugged Vibration 55 251 DV 6 KF 6 KF 16 55 267 DV 6 KF 25 KF 25 55 283 DV 6 VCR cn 55 88R CF DV 6R CF MiniContlat Extension Cables for VT Series DAVC 55 3 8 Ft Extension Cable 55 22 12 Ft Extension Cable 65 53 25 Ft Extension Cable 65 102 50 Ft Extension Cable 55 142 100 Ft Extension Cable Vacuum Gauge Tubes 20Torr Range 55 19 1 8 NPT Purple Base 55 19R 1 8 NPT Ruggedized 55 258 KF 16 55 266 KF 25 55 227 VCR Vacuum Gauge Tubes 100 mTorr Range 55 19 1 8 NPT Red Base 55 230 Reference Tubes for use with DAVC 55 104 Ref Tube DV 6 for DAVC 6 Calibration 55 101 Ref Tube DV 4D for DAVC 4 Calibration 55 103 Ref Tube DV 5 for DAVC 5 Calibration Page 6 of 17 2 0 Installation 2 1 Power I O Cable The Cable is assembled at the factory as shown in Fig 1 Its terminal end is finished with stripped wire ends each tinned with lead free solder This configuration is consistent with the previous analog version of the AVC and its color coded wire assignment remains the same as much as possible considering the additional features of the Digital version
22. y is in lieu of all other warranties expressed or implied including any implied warranty as to fitness for a particular use Hastings Instruments shall not be liable for any indirect or consequential damages Hastings Instruments will at its option repair replace or refund the selling price of the product if Hastings Instruments determines in good faith that it is defective in materials or workmanship during the warranty period Defective instruments should be returned to Hastings Instruments shipment prepaid together with a written statement of the problem and a Return Material Authorization RMA number Please consult the factory for your RMA number before returning any product for repair Collect freight will not be accepted 4 2 Non Warranty Repair Policy Any product returned for a non warranty repair must be accompanied by a purchase order RMA form and a written description of the problem with the instrument If the repair cost is higher you will be contacted for authorization before we proceed with any repairs If you then choose not to have the product repaired a minimum will be charged to cover the processing and inspection Please consult the factory for your RMA number before returning any product repair TELEDYNE HASTINGS INSTRUMENTS 804 NEWCOMBE AVENUE HAMPTON VIRGINIA 23669 U S A ATTENTION REPAIR DEPARTMENT TELEPHONE 757 723 6531 1 800 950 2468 FAX 757 723 3925 E MAIL mailto hastings instruments teledyne com
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