Bird Electronic Thruline 4020 Series Instruction Book Download Page 42 | Manualshive

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RS-232 Interface

33

Self Test

(J0)

Function

Initiates a hardware and software test.

Remarks

Results are stored in the U1 status word (see “Status” on page 31).
“J0” must be sent each time before reading the result.

W

ritable Store

(Wxxxxxx)

Function

Storage for six bytes of ASCII data.

Remarks

Data stored is lost when the 4421 is turned off.
Data is sent back as part of the U2 status word.

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Summary of Contents for Thruline 4020 Series

Page 1: ...rporation 30303 Aurora Road Cleveland Solon Ohio 44139 Sales Technical Support 440 248 1200 866 695 4569 toll free Sales email sales bird technologies com Technical Support email techsupport bird technologies com Copyright 2011 by Bird Electronic Corporation Instruction Book Part Number 920 4421 Rev U Thruline is a Registered Trademark of Bird Electronic Corporation ...

Page 2: ...st Alone Under no circumstances should any person reach into an enclosure for the purpose of service or adjustment of equipment except in the presence of someone who is capable of rendering aid WARNING Safety Earth Ground An uniterruptible earth safety ground must be supplied from the main power source to test instruments Grounding one conductor of a two conductor power cable is not sufficient pro...

Page 3: ...m the AC line before performing any maintenance including fuse replacement or changing the line voltage setting WARNING Use only Nickel Metal Hydride NiMH batteries that have a minimum capacity of 4500 milliamper hours mAh Do not install batteries that are not Nickel Metal Hydride Do not install NiMH batteries that have less than 4500 mAh capacity Failure to comply may result in damage to the batt...

Page 4: ...reduced battery charge and shortened battery life CAUTION During remote operation periodically monitor the bus service request line Failure to detect a service request could result in equipment damage CAUTION Due to the complexity of the Bird Power Sensor field repairs beyond general maintenance should not be attempted Removal or disturbance of the power sensor cover can result in cancellation of ...

Page 5: ...EL INSTRUMENTO BENUTZUNG WIRD DAS GERÄT AUF ANDERE WEISE VERWENDET ALS VOM HERSTELLER BESCHRIEBEN KANN DIE GERÄTESICHERHEIT BEEINTRÄCHTIGT WERDEN UTILISATION TOUTE UTILISATION DE CET INSTRUMENT QUI N EST PAS EXPLICITEMENT PRÉVUE PAR LE FABRICANT PEUT ENDOMMAGER LE DISPOSITIF DE PROTECTION DE L INSTRUMENT IMPRIEGO QUALORA QUESTO STRUMENTO VENISSE UTILIZZATO IN MODO DIVERSO DA COME SPECIFICATO DAL P...

Page 6: ...ELTEN NUR FÜR GESCHULTES FACHPERSONAL ZUR VERMEIDUNG GEFÄHRLICHE ELEKTRISCHE SCHOCKS SID WARTUNGSARBEITEN AUSSCHLIEßLICH VON QUALIFIZIERTEM SERVICEPERSONAL DURCHZUFÜHREN ENTRENTIEN L EMPLOI DES INSTRUCTIONS D ENTRETIEN DOIT ÊTRE RÉSERVÉ AU PERSONNEL FORMÉ AUX OPÉRATIONS D ENTRETIEN POUR PRÉVENIR UN CHOC ÉLECTRIQUE DANGEREUX NE PAS EFFECTUER D ENTRETIEN SI L ON N A PAS ÉTÉ QUALIFIÉ POUR CE FAIRE AS...

Page 7: ...O PUEDE REEMPLAZARLAS GERÄTE SIND MIT WIEDER AUFLADBAREN BATTERIEN BESTÜCKT BATTERIEN SIND NUR VON QUALIFIZIERTEM SERICE PERSONAL AUSZUWECHSELN CES DISPOSITIFS SONT ÉQUIPÉS DE BATTERIES RECHARGEABLES SEUL LE PERSONNEL D ENTRETIEN AUTORISÉ EST HABILITÉ À LES REMPLACER LE UNITÀ SONO DOTATE DI BATTERIE RICARICABILI CHE DEVONO DA COME SPECIFICATO DAL PRODUTTORE LA PROTEZIONE DI SICUREZZA POTREBBE VENI...

Page 8: ...R DE VOLTAJE DE 115 230V CA ESTE COLOCADO A LA LINEA DE VOLTAJE APROPIADA Y QUE EL FUSIBLE ESTE INSTALADO A LA LINEA CA ANTES DE APLICAR LA CORRIENTE ALTERNA VOR EINSCHALTEN DER WECHSELSTROMZUFUHR SICHERSTELLEN DASS DER 115 230V WECHSELSPANNUNGS SELEKTOR AUF DIE VORSCHRIFTSMÄSSIGE LEITUNGSSPANNUNG EINGESTELLT UND DIE RICHTIGE WECHSELSTROM HAUPTSICHERUNG EINGESETZT IST PRIMA DI EROGARE CORRENTE ASS...

Page 9: ...t Installation Describes the installation instructions for the power meter models covered in this manual Operating Instructions Describes the features of the power meters and pro vides power up instructions IEEE 488 GPIB Interface Describes the features of the IEEE 488 GPIB Inter face RS 232 Interface Describes the features of the RS 232 Interface Maintenance Contains preventative maintenance info...

Page 10: ...ower Ranges 4 4020 Series 4 4027A Series 4 4027F Series 4 4028 Series 4 Chapter 2 Installation 5 Sensor Connection 5 RF Line Connection 5 Panel Mounting the 4421 Power Meter 5 Handle Operation 6 115 230V AC Input Power 6 AC Line Connectors 6 Batteries 7 Chapter 3 Operating Instructions 9 Push Button Functions 9 Error Codes 10 Audible Warning 10 Chapter 4 IEEE 488 GPIB Interface 11 Description 11 C...

Page 11: ...Test 37 Push Button Test 37 Repair 38 Front Panel Cal Cart only 38 Cord Reel Cal Cart only 39 Replacing Fuses 39 Replacing Batteries 40 Long Term Storage 40 Power Sensor Cal Cart only 41 Load 41 Casters 41 Handle 41 Storage and Shipment Cal Cart only 42 Specifications Cal Cart 42 Max Power 42 Specifications 4421 Power Meter 43 Specifications Power Sensors 43 Specifications RS 232 Interface 47 Spec...

Page 12: ...he hardware necessary to allow the 4421 to be remotely controlled by controllers with different wiring arrangements Requires an RS 232 interface module Figure 1 Bird 4421 Meter Outline Drawing REMOVE AC POWER BEFORE ATTEMPTING TO SERVICE THIS INSTRUMENT VOLTAGE 115 230 V FUSE RATING T630mA T315mA FREQUENCY 50 60 Hz MAXIMUM POWER 60W AC SUPPLY ON O OFF I POWER SENSOR REAR 6 7 8 9 10 13 12 11 12 1 4...

Page 13: ...ls 4027F Series Bird 4027F Series Power Sensors are similar to the 4027A series However additional filtering allows the 4027F to ignore harmonics of the signal being measured The 4027F is also less sensitive to AM components of the signal 4027F Sensors are accurate to 1 2σ at specified calibration frequencies and power levels Figure 2 Power Sensor Outline Drawing 4020 4027A 4027F 4028A Series 4028...

Page 14: ...Introduction 3 Figure 3 Power Sensor Outline Drawing 4028B Series only Figure 4 Power Sensor Outline Drawing 4028C Series only SENSOR PLUG SOCKET 3 75 96 mm 4 75 121 mm 3 5 89 mm 6 75 172 mm SOURCE LOAD ...

Page 15: ...W 10 kW 4027A12M 10 15 MHz 300 mW 1 kW 4027A25M 25 30 MHz 3 W 9 kW 4027A35M 35 45 MHz 3 W 7 5 kW 4027A60M 45 65 MHz 3 W 6 kW 4027A100M 95 105 MHz 3 W 4 kW 4027A150M 150 170 MHz 3 75 W 3 75kW Model Frequency Range RF Power Range 4027F2M 1 8 2 2 MHz 100 W 10 kW 4027F10M 12 15 MHz 3 W 4 kW 4027F60M 57 63 MHz 3 75 W 3 75 kW Model Frequency Range RF Power Range 4028A250K 250 400 kHz 1 kW 20 kW 4028A400...

Page 16: ... includes complete installation instructions Figure shows the over all dimensions and mounting points for a 4421 Power Meter installed in a panel mount kit Note The power supply interrupt switch for the 4421 Power Meter is located on the rear panel When you install a unit in a panel mount kit you need to provide a means to interrupt the power supply that is easily accessible to the user such as a ...

Page 17: ...tage because the power supply automati cally senses the input voltage However you must make sure that you have the correct power cord plug and fuses installed for the line voltage you are using refer to Replacing Fuses page 39 AC Line Connectors To make the AC line cord compatible with non U S voltages users must install the appropriate connector on the power cord RF POWER METER dBm MAX LIGHT SWRM...

Page 18: ...nt for approximately 28 hours before using it for continous operation Note Battery charging at temperatures greater than 45 C 113 F can result in reduced operational time CAUTION Long term storage of this instrument can affect battery performance and reduce battery life Do not store the instrument for long periods of time without recharging the batteries refer to page 40 Failure to comply may resu...

Page 19: ... after pressing FWD or RFL dBm indicator turns on Power is displayed in dBm units Note Used after pressing SWR Return loss is displayed LIGHT Press to turn on or turn off the display s backlight If left on the light automatically shuts off after 30 minutes AUTO Press to automatically set the scale AUTO turns on UP DOWN Press to select the next higher lower scale If the scale is too high for the po...

Page 20: ... exceeds 120 of the power sensor s maximum power capability the power meter will sound a warning buzzer Symbol Explanation Value greater than overrange limit of function Value less than underrange limit of function Function Limit Error FWD RFL Power 199 9 of full scale or 120 of top range Overrange FWD dBm RFL dBm Power 120 of full scale Overrange Power 3 of low range Underrange SWR FWD 20 of low ...

Page 21: ...s Cable Connector The interface uses a standard IEEE 488 cable connector Pin assignments are listed in Table 5 3 Table 5 3 IEEE 488 Pin Assignments CAUTION During remote operation periodically monitor the bus service request line Failure to detect a service request could result in equipment damage Pin Designation Type 1 D101 Data 2 D102 Data 3 D103 Data 4 D104 Data 5 EOI Management 6 DAV Handshake...

Page 22: ... sum of the bits turned off equals the desired primary address In Figure 8 below the address is set to 6 the off switches have values of 4 and 2 Figure 8 IEEE Interface Default DIP Switch Settings Code Name Description SH1 Source Handshake Can handshake data or command bytes when the unit is acting as a source AH1 Acceptor Can handshake the bus when it is acting as the acceptor of data or commands...

Page 23: ... repeated for example PNFCFDT3TRG This string sets up the 4421 to send no prefixes read forward dBm make one reading on TRG and triggers a measurement Note Commands can be entered in either upper or lower case Note Only the last command entered of each category will be exe cuted As a command string is processed by the 4421 each category of command is stored in a separate location Two commands of t...

Page 24: ...eration Remarks Issuing a GTL command while the device is in Local Lockout mode does not clear the lockout condition The REMOTE indicator turns off The LISTEN indicator remains on Local LOckout LLO Function Disables local operation of all devices on the bus Remarks REN must be true to use LLO LLO is cleared by setting REN false InterFace Clear IFC Function Terminates all bus activity and passes co...

Page 25: ...ce to an initialized state Remarks Only the device addressed will be cleared The 4421 returns to the factory default condition Group Execute Trigger GET Function Initiates a measurement for all devices set to trigger on GET Remarks The 4421 must be already set to trigger on GET Used to synchronize measurements of multiple instruments Default Condition Related Command Forward Carrier Wave FC Auto R...

Page 26: ...request could result in equipment damage Bit Name Condition 6 SRQ Set if a service request is generated by the 4421 If an SRQ has been received by the controller and this bit is cleared other instruments on the bus should be checked to determine where the SRQ occurred Cleared by a serial poll of the 4421 3 Measurement Complete Set when the power meter has completed a reading Cleared by requesting ...

Page 27: ...off stay at present range Terminators YT Two terminators CR LF YO One terminator CR YN No terminator Prefixes PY Prefix YES PN Prefix NO Triggers T0 Continuous on TALK T1 One shot on TALK T2 Continuous on GET T3 One shot on GET T4 Continuous on measurement command T5 One shot on measurement command Serial Polling M00 Do not generate SRQ M01 Generate SRQ on error M02 Generate SRQ on measurement ove...

Page 28: ... returned in Watts or dBm Standing Wave Ratio SW Return Loss RL Function Selects SWR or return loss match measurement mode Remarks Measurement results are returned in VSWR or dB MiNimum Value MN MaXimum Value MX Function Selects minimum or maximum measurement mode Remarks Another measurement must be selected before selecting min or max Returns the minimum or maximum value of the previous measureme...

Page 29: ...e return CR z N for no terminator message can be terminated by EOI Remarks Many controllers use the terminator sequence to recognize the end of an input string Using incorrect terminators can lock the bus Command Power Range RYY Turn auto range on RNN Turn auto range off Keep present range R17 18 0 199 9 MW R16 1 80 19 99 MW R15 0 180 1 999 MW R14 18 0 199 9 kW R13 1 80 19 99 kW R12 0 180 1 999 kW...

Page 30: ...ble 5 11 Remarks Failure to trigger device before requesting a reading will lock the bus T1 halts the bus until a reading is available T0 and T1 do not set the measurement complete SRQ T2 T3 T4 and T5 set a SRQ when the measurement is complete Fastest reading rate is 2 4 readings second slowest is 1 reading sec Table 5 11 Trigger Conditions Data String Description NFC 0 123W CR LF Normal N forward...

Page 31: ...r error status z 2 for revision history Remarks After sending the status command a status word is sent the next time the unit is addressed to talk To ensure the correct status is transmitted the sta tus word should be requested as soon as possible after the command is sent Machine Status Word U0 The format of the machine status word is shown in Figure 9 The default values are also shown Figure 9 M...

Page 32: ...l device dependent command IDDC such as V2 is received V is illegal VCM Valid Command Set when no IDDC is received ICO Invalid Command Option Set when an illegal device dependent command option IDDCO such as T6 is received 6 is illegal VCO Valid Command Option Set when no IDDCO is received PS Self Test Pass Set when a self test has been initiated by the J0 command and the test result is acceptable...

Page 33: ...Function Enables or disables the End or Identify EOI signal Set x to z Y to enable z N to disable Remarks Disabling EOI can cause some controllers to lock unless another terminator is used When enabled EOI is only asserted at the end of a multiple byte string Writable Store Wxxxxxx Function Storage for six bytes of ASCII data Remarks Data stored is lost when the 4421 is turned off Data is sent bac...

Page 34: ...re the interface module s connector A null modem kit should be used for rewiring instead Table 6 13 RS 232 Pin Assignments Indicators The bottom line of the power meter s display shows indicators describing the status of the Bird 4421 when used with the RS 232 interface These are TALK When TALK is displayed the power meter is transmitting data This is always shown when the unit is in talker only m...

Page 35: ...ew settings will not become effective unitl you turn power OFF and then back ON Switch Function Description 1 Stop Bit ON 1 Stop Bit OFF2 Stop Bits Default factory setting 2 Command Mode ON ENT command needed before sending reading to controller OFFTrigger automatically sends reading Reading also sent when front panel push button pressed 3 Word Length ON 8 Data Bits OFF7 Data Bits 4 5 Parity 4 5 O...

Page 36: ...ntax The Bird 4421 accepts two types of commands General bus commands are commands such as Initialize INT that apply to any RS 232 interfaced device Device dependent commands are specific to the 4421 If an invalid command is sent to the unit an error condition is placed in the serial poll byte and the offending command is not executed A group of device dependent commands can be sent as a single st...

Page 37: ...ecognizes a valid Bx command its baud rate is immediately changed The controller is assumed to be transmitting at the new rate other wise sending commands would not be possible This command overrides the DIP switch setting Table 6 15 Baud Rates Xmission Flow Control XO XF Function Enables or disables the XON XOFF flow control z XO enables flow control z XF disables flow control Remarks When data i...

Page 38: ...asurement results are returned in VSWR or dB Category Command Description Measurement FC Forward carrier wave FD Forward dBm RC Reflected carrier wave RD Reflected dBm SW Standing wave ratio RL Return loss MN Minimum value MX Maximum value Range RYY Auto range on R00 to R17 Manual ranges RNN Auto range off stay at present range Terminators YT Two terminators CR LF YO One terminator CR YN No termin...

Page 39: ...nators a carriage return CR and a line feed LF z O for one terminator a carriage return CR z N for no terminator Remarks Many controllers use the terminator sequence to recognize the end of an input string Using incorrect terminators can lock the bus Prefixes Px Function Turns the prefix mode on or off Set x to z Y to enable prefixes z N to disable prefixes Command Power Range RYY Turn auto range ...

Page 40: ...owest is 1 reading sec Table 6 19 Trigger Conditions Status Ux Function Reads a status word and returns the information as a string Set x to z 0 for machine status z 1 for error status z 2 for revision history Remarks After sending the status command a status word is sent the next time the unit is addressed to talk To ensure the correct status is transmitted the sta tus word should be requested as...

Page 41: ...mmand Set when an illegal device dependent command IDDC such as V2 is received V is illegal VCM Valid Command Set when no IDDC is received ICO Invalid Command Option Set when an illegal device dependent command option IDDCO such as T6 is received 6 is illegal VCO Valid Command Option Set when no IDDCO is received PS Self test Pass Set when a self test has been initiated by the J0 command and the t...

Page 42: ...s Results are stored in the U1 status word see Status on page 31 J0 must be sent each time before reading the result Writable Store Wxxxxxx Function Storage for six bytes of ASCII data Remarks Data stored is lost when the 4421 is turned off Data is sent back as part of the U2 status word ...

Page 43: ...ng table below If the power sensor is malfunctioning return it for service This manual cannot list all malfunctions that may occur or corrective actions If a malfunction is not listed or is not corrected by the listed corrective actions contact a qualified service center Note For power sensors in Cal Carts following the test procedure will check the sensor not covered by the safety cover To test t...

Page 44: ...spond Test the push buttons See Push Button Test on page 37 Are they defective Return meter for service Every segment on the display is lit Return meter for service IEEE 488 Interface does not respond to the interface link Are the address in the interface program and the address setting on the DIP switches on the interface module the same Change the program or DIP switch setting so that the addres...

Page 45: ...ayed after the power meter data then the power sensor is malfunctioning Figure 16 Test Display No Malfunction Push Button Test Note If a push button is malfunctioning return the power meter 1 Disconnect the power sensor 2 Turn the power meter ON Note After the power up display disappears a dash should scroll across the display 3 Turn the power meter OFF 4 Connect the power senson 5 Turn the power ...

Page 46: ...uld change ranges each time it is pressed until it reaches 0 00 W 19 Turn the power meter OFF Repair Front Panel Cal Cart only Note If the power meter is mounted in a Cal Cart to access the power sensor or the ac connections it will be necessary to remove the front panel of the Cal Cart 1 Remove both screws on the front panel between the RF connector and the handle 2 Pull on the handle set into th...

Page 47: ...dule The fuse holder does not detach from the AC module 2 Install the replacement fuses then close and secure the fuse holder Fuse 1 is a spare fuse and fuse 2 is the active fuse Figure 18 AC Line Fuse WARNING To avoid personal injury disconnect the power cord from the ac line before performing any maintenance including fuse replacement CAUTION Failure to install the properly rated fuse may result...

Page 48: ... the bat teries When the instrument is stored for long periods of time without use the batteries will loose their charge and also loose the ability to reach full charge when put into service To restore the battery charge perform a full charge for 28 hours If the batteries are not fully charged after 28 hours completely discharge the batteries then perform a full charge again If necessary repeat th...

Page 49: ... Cal Cart 5 Remove the load Casters 1 Remove the load See Load on page 41 2 Flip the cart over 3 Unscrew the defective caster 4 Screw the new caster into place and replace the load Handle 1 Unscrew the hadle 2 Remove the old handle 3 Screw the new handle into place WARNING To avoid personal injury disconnect the power cord from the AC line before performing any maintenance including fuse replaceme...

Page 50: ...tomer Service Max Power Under normal operating conditions the Cal Cart s maximum power is the MINIMUM of the max power of the sensor and the max power of the load The following modifiers apply z Above 65 MHz derate the load s max power See High Frequency Derating 1 on page 47 z Due to the wide variety of available connectors frequency range and maximum power may be reduced Insertion loss is specif...

Page 51: ...ire approximately 28 hours to recharge Display LCD 4 digit display Indicates mode measurement units battery condition remote status and signal increase decrease Self contained backlight Optional Interfaces IEEE 488 GPIB RS 232 Fuse Rating IEC 5 x 20 mm Time Lag Type T 115 Vac 230 Vac T630 mA T315 mA CE CE Compliant Refer to Declaration of Conformity for specific standards Humidity 95 max nonconden...

Page 52: ...r cable Connectors 4028B10M 4028C10M 4028A Series All other models 1 5 8 EIA Flanged 3 1 8 EIA Flanged 7 16 DIN LC HN or 7 8 Customer specified from QC list appropriate for frequency and power CE CE Compliant Refer to Declaration of Conformity for specific standards Humidity Max 95 noncondensing Altitude Max 10 000 feet 3 000 m Temperature Range Operating Storage 0 to 50 C 32 to 122 F 20 to 70 C 4...

Page 53: ...4027A4M 4027A10M 250 400 kHz 400 550 kHz 800 950 kHz 1 5 2 5 MHz 3 5 MHz 10 15 MHz 4027A12M 4027A25M 4027A35M 4027A60M 4027A100M 4027A150M 10 15 MHz 25 30 MHz 35 45 MHz 45 65 MHz 95 105 MHz 150 170 MHz RF Power Range 4027A12M 4027A25M 4027A35M 4027A60M 300 mW 1 kW 3 W 9 kW 3 W 7 5 kW 3 W 6 kW 4027A100M 4027A150M All other models 3 W 4 kW 3 75 W 3 75 kW 3 W 10 kW Accuracy Fwd Best Case For rated ac...

Page 54: ...3 kW VSWR Max 1 05 1 Insertion Loss Max 0 05 dB with female N connectors Directivity Min 28 dB Frequency Range 4028A250K 4028A400K 4028A2M 4028A3M 4028A4M 4028A10M 4028B10M 4028C10M 4028A25M 4028B3M 250 400 kHz 400 550 kHz 1 5 2 5 MHz 2 5 3 5 MHz 3 5 4 5 MHz 10 15 MHz 25 30 MHz 2 5 4 MHz RF Power Range 4028A250K 4028A400K 4028C10M All other models 1 kW 20 kW 500W 50 kW 1 kW 25 kW Accuracy Fwd Best...

Page 55: ...orage 0 to 50º C 32 to 122º F 20 to 50º C 4 to 122º F Dimensions 6 5 L x 4 5 W 165 x 115 mm Weight 0 5 lbs 0 23 kg nominal Logic Levels Meets all IEEE Standard 488 1978 specifications Modes of Operation Switch and bus selectable Talk Only Allows the 4421 to send to the bus keyboard initiated measurements only Addressable Allows the 4422 to be addressed as talker or listener under the command of an...

Page 56: ...ac 1 5A2626 Cable Sensor 1 4421 038 Grommet 1 4421A372 Cordreel 1 4421A383 Casters 4 4421A384 Handle 1 4421A385 IEEE 488 Bus Interface Module 1 4421 489 2 Cable IEEE 488 2 m 1 m 1 5 1317 2 5 1317 1 RS 232 Bus Interface Module 1 4421 233 1 Cable RS 232 10 ft 5 ft 1 5 1662 2 5 1662 1 Null Modem Kit RS 232 only 1 4380 250 Panel Mount Kit 1 4421 250 Battery C size NiMH 8 5A1230 Frequency MHz Load Dera...

Page 57: ...C Female 4240 031 LC Male 4240 025 Open Term 10 32 Nut 4240 080 N F 4240 062 7 16 Jack IEC Type 169 4 4240 344 LT Female 4240 018 LT Male 4240 012 N Female 4240 062 N Male 4240 063 SC Female 4240 090 SMA Female 4240 336 SMA Male 4240 334 7 16 Jack IEC Type 169 4 4240 344 7 16 Plug IEC Type 169 4 4240 363 TRU 6934 F 4240 371 TRU 7958 F 4240 372 Mini UHF Female 4240 346 UHF Female 4240 050 UHF Male ...

Page 58: ... All instruments returned must be shipped prepaid and to the attention of Bird Service Center Bird Service Center 30303 Aurora Road Cleveland Solon Ohio 44139 2794 Phone 440 519 2298 Fax 440 519 2326 E mail bsc bird technologies com For the location of the sales office nearest you give us a call or visit our Web site at http www bird electronic com ...

Page 59: ...t and shall not apply to any goods or parts thereof furnished by Buyer or acquired from others at Buyer s request and or to Buyer s specifi cations Routine regularly required calibration is not covered under this limited warranty In addi tion Seller s warranties do not extend to the failure of tubes transistors fuses and batteries or to other equipment and parts manufactured by others except to th...

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