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Bird SiteHawk Operation Manual

37

System Settings

Press the SYS icon on the SYS menu to open the System Settings dialog. The
System Settings dialog allows the user to change system display settings. The
full menu is best viewed with the SiteHawk in the vertical position.

User options include:



Change Trace color



Change limit Line color



Change font size



Change line widths



Toggle Full Screen on and off



Select Language

Figure

30

System Settings

EXIT

Press the exit icon on the SYS menu to close the SiteHawk application.

About Screen

Press the information icon on the SYS menu opens the About Screen. The About
screen displays the software version and the device serial number.

Figure

31

System About

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Содержание SiteHawk SK-200-TC

Страница 1: ...SiteHawk Analyzer SK 4500 Operation Manual Copyright 2017 by Bird Technologies Inc Instruction Book Part Number 920 SK 4500 Rev B SiteHawk is a trademark of Bird Electronic Corporation ...

Страница 2: ... to remove the RF transmission line while RF power is present WARNING Do Not Service Or Adjust 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 uninterruptible earth safety ground must be supplied from the main power source to ...

Страница 3: ...nt cautions appear in the text and are repeated here for emphasis CAUTION Do not connect the unit to a PC USB port File transfer must be done using a USB Drive See Page 38 43 and 53 CAUTION Only use the supplied AC adapter to charge the unit The unit cannot be charged through a USB port i e from a laptop Charging from a power source other than the supplied charger may damage the battery See pages ...

Страница 4: ...ÓN DE SEGURIDAD DEL 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 IMPIEGO QUALORA QUESTO STRUMENTO VENISSE UTILIZZATO IN MODO DIVERSO DA COME S...

Страница 5: ...GERÄTES GELTEN NUR FÜR GESCHULTES FACHPERSONAL ZUR VERMEIDUNG GEFÄHRLICHE ELEKTRISCHE SCHOCKS SIND 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 C...

Страница 6: ...ICIO AUTORIZADO 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...

Страница 7: ...oduction Describes the features of the Bird SiteHawk lists equipment supplied and optional equipment provides power up instructions and measurement settings Measure Match Mode Lists the steps to make match measurements as well as providing instructions for all functions available in Measure Match mode Distance to Fault Measurements The DTF measurement shows the location of any problems in the ante...

Страница 8: ... 10 Setting the Measurement Data Points 11 Setting the Distance Units and Cable Values DTF Menu 12 Trace Settings 14 Chapter 2 Calibration 16 Calibrating the SiteHawk Analyzer 16 Chapter 3 Measure Match Mode 17 Selecting Measure Match Modes and Measurement Units 17 Interpreting the Measurement 18 Cable Loss Measurement 18 Chapter 4 Fault Location Mode 21 Frequency Span and Max Distance 21 Calculat...

Страница 9: ...xport 38 Saving and Recalling SiteHawk Status Data 38 Chapter 7 Maintenance 47 Cleaning 47 Charging the Battery 47 Replacing the Battery 48 Device Calibration 48 Storage 48 Edit Cable List 49 Firmware Update 53 Customer Service 54 Limited Warranty 56 ...

Страница 10: ...a points measured across a user specified frequency band or distance range are graphed on a 1920 x 1080 pixel touch screen display area Power Meter Application SiteHawk Analyzers include the Bird RF Meter Application The Bird RF Meter is an Android application designed to work with a wide variety of Bird Power Sensors To measure transmitter power connect an external power sensor to the SiteHawk Po...

Страница 11: ...N OTG 2 AC Adapter 12 VDC APL336 1230 Touch Pen stylus SK TP 112 USB Drive 5A2745 1 Instruction Manual 920 SK 4500 RF Cable 1 meter SK TC MNFN 1M Calibration Combination Cal Combo DC 4 GHz SK CAL MN C Li ion Battery 7 4 V 6800 mAh SK BTY 7468 Optional Accessories Description Part Number N type Male to 7 16 DIN Female adapter PA MNFE ...

Страница 12: ...dB F 0 02 dB C Return Loss Measurement Range Resolution 0 dB to 60 dB 0 01 dB VSWR Measurement Range Resolution 1 0 to 65 0 0 01 Cable Loss Measurement Range Resolution 0 dB to 30 dB 0 01 dB DTF Range 0 to 5000 ft 0 to 1500 m Test Port Connector Impedance N type Female 50 ohms Connector USB C USB 3 0 Dimensions L W H 7 7 x 3 6 x 2 4 in 195 x 90 x 60 mm Weight 1 98 lbs 0 9 kg Maximum Input Power 22...

Страница 13: ...r Specifications Frequency DC 6 GHz Resistance 50 Ohm VSWR 1 15 max Pressure 84 to 106 7 kPa Warm Up Time 15 minutes Power Measurement Yes with RF Meter App Compatible Devices 4043 5012D 5014 5015 5015 EF 5016D 5017D 5018D 5019D 7020 7022 7023 Storage Capacity 16 GB Immunity to Interfering Signals 13 dBm CE CE compliant EMC Safety and RoHS Battery 10 hours continuous use 7 4 V 6800 mAh Battery Cha...

Страница 14: ...rence measurement Measure relative to limit line or recalled trace Measurement hold to temporarily store a trace Frequency Start Stop or Center Span frequencies Return Loss dB Cable Loss dB SWR ratio DTF SWR ratio or DTF Return Loss dB Connectors and Ports Figure 1 SK 4500 Connectors and Ports 1 Antenna Test Port Female N connector for connecting to the antenna Use a phase stable cable for best re...

Страница 15: ...from a full discharge is approximately 5 hours with unit powered off Note When the unit is received the battery may not be fully charged An AC adapter should be used when operating the unit for the first time Powering On 1 Press Power button for 5 seconds Note Unit will complete power up in approximately 30 secs Powering Off 1 Press Power button for three seconds Note A Device Options dialog will ...

Страница 16: ...onsists of a touch screen interface The user presses the screen to access menus change settings perform measurements and save results Note The displays used in this manual are shown with the Site Hawk in the horizontal position some menus may display differ ently if accessed with the unit in a vertical position Display options can be controlled via the settings menu on the home screen ...

Страница 17: ...de Item Description 1 Measurement Mode press to display Measurement Mode menu 2 Trace Selection press to choose number of traces to display 3 MKR icon press to display the Marker menu 4 SCALE icon press to display the scale menu 5 LIMIT icon press to display the limit menu ...

Страница 18: ...titude battery time remaining battery percentage remaining 10 Stop Frequency press the data field to change the value or press the label to change to frequency Span 14 11 Sweep display area 12 Points press the data field to choose the number of measurement points 13 Start Frequency press the data field to change the value or press the label to change to Center Frequency 15 14 Span displays the cur...

Страница 19: ...r maximum frequency of the model There are two methods available to change the start stop center frequencies and frequency span display screen entry and FREQ menu entry Changing Measurement Frequency on the Display 1 Press the data field of the frequency to change 2 Type the new value using the number pad 3 Press Enter Changing Measurement Frequency on the FREQ Menu 1 Press the Menu icon See Figur...

Страница 20: ...ases the detail in Measure Match mode measurements When saving a trace the number of data points collected are saved A progress bar just below the x axis will indicate the progress of the sweep When the number of measurement data points are changed the current trace is erased and the Save softkey is disabled until the sweep finishes and the screen displays the first new trace Changing the Number o...

Страница 21: ...oint where to begin the trace display and the stop point where to end the trace display can be set Distance Unit 1 Select DTF 2 Unit Select units settings Note The system default unit m optional units ns ft Start Distance 1 Select the input box 2 Set starting values End Distance 1 Select the input box 2 Set ending values Windows 1 Select the Window 2 Select the corresponding window style Note Defa...

Страница 22: ...s known cable values for a variety of cable types The Cable List may be edited to add or delete cables See Edit Cable List on page 49 1 Select CableList 2 Set cable type 3 Select a certain cable type Note Each cable type in the cable list has the fixed values for cable velocity and cable loss Selecting a cable from the cable list will automatically populate the cable velocity and cable loss data f...

Страница 23: ...icate the active Trace 2 Change one or both trace limits to change the grid scale for the trace Set the maximum value a Press the maximum value to open the Top value dialog b Enter a maximum value Set the minimum value a Press the minimum value to open the Bottom value dialog b Enter a minimum value 3 Trace Count Setting a Press the Trace icon on the menu bar b Choose the number of traces to displ...

Страница 24: ...LE icon See Figure 6 on page 15 2 Select one of the following from the menu a For Manual Operation Press Top to change upper limit of the display Press Bottom to change the lower limit of the display b For Auto Scale Press Auto Scale for the system to choose the best fit for the active trace Note The scale can also be dynamically changed by pressing and dragging the trace up or down in the display...

Страница 25: ... calibrating the unit 1 Press the Calibrate icon 2 Connect the Cal Combo Open connector to the unit antenna port 3 Press the Open softkey 4 Wait for the unit to sweep and a Green Check to display 5 Connect the Cal Combo Short connector to the unit antenna port 6 Press the Short softkey 7 Wait for the unit to sweep and a Green Check to display 8 Connect the Cal Combo Load connector to the unit ante...

Страница 26: ... following from the Measurement Mode menu ReturnLoss SWR Note When making a match measurement select units for the Y vertical scale SWR for standing wave ratio or Return Loss for dB Figure 8 Selecting the Measure Match Mode 3 Select the number of Data Measurement points 4 Set the Frequency range Note Frequency range should be greater than the normal range of the antenna Example For a 450 MHz anten...

Страница 27: ... dB and ratio data values Horizontal grid scale x axis displays frequency time or distance data values The measured value of the Markers 1 and 2 in this example Trace number Tr1 and color is used identify the trace When scanning duration is more than 1 second a current position indicator will appear Cable Loss Measurement Ensure that the cable being tested is unterminated not connected to anything...

Страница 28: ...he SiteHawk Analyzer See Calibration on page 16 Note After Calibration with the load still connected the Output must be below 25 dB If not there may be an issue 6 Remove the Cal Combo unit from the cable 7 Connect the phase stable cable to one end of the cable under test 8 Connect the Short connection on the Cal Combo unit to the other end of the cable under test 9 Wait at least 10 seconds to allo...

Страница 29: ...igure 11 Interpreting Cable Loss Measurement 1 Marker 1 and Marker 2 indicate the minimum and maximum loss for the cable under test 2 Take the average of M1 and M2 Note This is the average cable loss across the frequency band 3 Compare the loss with the manufacturer s specified loss for a cable of this length Note If they do not correspond measure the cable loss again then check the cable for prob...

Страница 30: ... the cable Vp and the number of measured data points determine the maximum distance tested during fault location test Max Distance The maximum measurable distance can be calculated by SiteHawk based on the specified frequency span or the maximum distance can be entered manually instead of entering the frequency span If the maximum distance being measured is entered instead of the frequency span th...

Страница 31: ...e Narrowing the frequency span increases the measurable distance Velocity of Propagation The velocity of propagation Vp is a characteristic of the cable and is expressed as a percentage Consult the cable manufacturer s specifications to get the velocity of propagation value for the cable being used Calculating the Frequency Span T 1 F N 1 Fmax Fmin DTFmax C V p T 2 C V p N 1 2 Fmax Fmin Note N Tes...

Страница 32: ...ies 5 Press Start distance field and enter the start value 6 Press the Stop distance field and enter the stop value 7 Press DTF Menu 8 Press Window selection to change the display to the desired value 9 Enter Cable data using one of the following methods a Press velocity and enter the cable velocity Press cable loss and enter the cable loss value b Press cable list select the cable type from the l...

Страница 33: ...ault Location measurement for an antenna system The table lists typical component return losses Figure 13 Interpreting Fault Location Measurement Typical Component Return Loss Antenna at Resonance 14 dB Connector 25 dB Jumper 35 dB Lightning Protector 25 dB Transmission Line 30 dB Each connector or jumper will show as a spike If it is larger than the typical value check the connector for damage Sp...

Страница 34: ...ble system antenna To display the full cable system always set the maximum distance to a value that is a few feet or meters greater than the entire length of the cable system A large spike fault near the SiteHawk Analyzer will mask other faults farther away When a large spike near the Site Analyzer is found fix it and then repeat the Fault Location measurement ...

Страница 35: ...ls falling outside acceptable limits can be visually and audibly enhanced using a failure flag and alarm Note Limit lines are available in any measurement mode Setting Limit Lines 1 Press LIMIT icon Figure 14 Limit Menu 2 Select from the following limit options Limit On Off Press to toggle limit line on and off Style Max Min Press to toggle maximum or minimum limit line Note The default is Max is ...

Страница 36: ...e the limit line the value in the Step field Move Down Press to move limit line down the vertical scale Each press will move the limit line the value in the Step field FailFlag On Off Press to toggle fail flag on and off The words PASS or FAIL will be displayed in the sweep display area to indicate if the active signal is within or outside the limits set by the limit line FailAlarm On Off Press to...

Страница 37: ...trace and the current measurement trace are displayed at the same time there is an additional marker option single mode and dual mode In single mode the markers function normally indicating the frequency and value at the marker In dual marker mode select a marker using the Mark softkey At the bottom of the screen the site analyzer will display the marker number the frequency and the value of the c...

Страница 38: ...uttons are pressed Press the Step field to enter a value Moves the position of the marker left or right by the step entered Move Left Press to move the active marker to the left Each press will move the active marker the value in the Step field Move Right Press to move the active marker to the right Each press will move the active marker the value in the Step field Search Max Press to move the act...

Страница 39: ...on one trace and at least two markers must be displayed for the Delta Option to work 1 Select the marker on the screen to be the active marker Note In Figure 18 marker 3 is the active marker marker 1 and 2 are turned on Figure 18 Active Marker 2 Press MKR icon and select DeltaMarker Note In Figure 19 marker 3 is highlighted markers 1 and 2 are now delta markers 1 3 and 2 3 Delta markers 1 3 and 2 ...

Страница 40: ...arker 3 to move to the peak signal between marker 1 and marker 2 positions All markers follow the current trace only Note Three markers must be displayed for the peak search between markers to work Marker 3 will always find the peak between marker 1 and 2 regardless of how many other markers are displayed 1 Press MKR icon and Add markers 1 2 and 3 2 Move marker 1 and 2 to the upper and lower limit...

Страница 41: ...ure 21 Marker 3 Peak Search Utility Menus Pressing the Menu icon will display the utility menus MEM FREQ RESET FILE PNG SYS See Figure 22 These menus are described in this section with the exception of the FREQ menu the FREQ menu is described in Setting the Measurement Frequencies on page 10 Figure 22 Utility Menus ...

Страница 42: ...eenshots Screenshots can be saved by using the Save Screen Picture options on the File menu or by pressing the PNG Icon The current time is added to all screen shots The site name may be added as an option Save Screen Picture png Saves a PNG file of the current Sweep Display Area press the menu option and a save dialog is displayed allowing the user to enter a file name or use the default file nam...

Страница 43: ...lack and white When set to OFF screen shots will be black and white when set to ON screen shots will be in color See Figure 24 Note The default setting for Color Screen Shot option is OFF If the SiteHawk application is exited or SiteHawk is powered off the Color Screen Shot option is reset to OFF Figure 24 Screen Shots in Color or Black and White Delete User File Press to display the Delete User F...

Страница 44: ...gure 26 The site name must be entered the first time a screen shot is saved Note The default setting for the Site Name option is OFF If the SiteHawk application is exited or SiteHawk is powered off the site name is reset to NULL and the Site Name option is reset to OFF Figure 26 Site Name Dialog Box The site name will appear at the bottom of the sweep display screen shot See Figure 27 If no site n...

Страница 45: ...ck OK to confirm reset PNG Icon Pressing PNG will save the current sweep display area as an image with a PNG file type extension The save path and filename will briefly be displayed at the bottom of the screen See Figure 28 Note If the Site Name option is set to ON an Edit SiteName dialog box will be displayed each time screen shot is taken See Figure 26 Figure 28 PNG Screenshot SYS Menu SYS menu ...

Страница 46: ... the vertical position User options include Change Trace color Change limit Line color Change font size Change line widths Toggle Full Screen on and off Select Language Figure 30 System Settings EXIT Press the exit icon on the SYS menu to close the SiteHawk application About Screen Press the information icon on the SYS menu opens the About Screen The About screen displays the software version and ...

Страница 47: ... comma separated values CSV file The CSV file contains a list of data separated by commas The current format and response trajectory under the incentive value is stored in the CSV file Trace data is saved in the following format to the CSV file F n Frequency about point N Data1 Trace response value Real part Data2 0 Imaginary part Trace Data S1p File SiteHawk can save the parameters to the S1p fil...

Страница 48: ...g Amp dB and Phase Z0 reference impedance F n Frequency about point N RI MA DB RI MA DB Save Files on SiteHawk The SiteHawk Analyzer automatically names files using a time date format this can be changed during the save operation Figure 32 SiteHawk File Names Saving Files 1 Press the Menu icon 2 Press the FILE icon to display the file menu See Figure 33 ...

Страница 49: ... can be saved as a datafile csv Screenshots can be saved as png or jpeg 4 Press appropriate Save icon each save type has its own save button Note Unless a custom name is entered a default filename will be automatically generated This file will be saved to the internal memory of the unit 5 Change the file name if desired and press Save Figure 34 File Save Dialog ...

Страница 50: ...6 Press Load See Figure 35 page 41 Note The active and the recalled trace data will be displayed together in the sweep display area In the example Tr1 is the active trace the recalled trace data is indicated with OFF and the file name Figure 35 Recall Sta Data and Running Data 7 Press OFF to remove the recalled trace data Deleting SiteHawk Stored Data Files This procedure can be used to delete any...

Страница 51: ...r press file folder icon to browse for the desired folder See Figure 37 Figure 37 Directory Selection Note Only folders may be selected in the File List This dialog box is used to select the folder containing the files to be deleted c Press OK 5 Select the file types to delete Note All file types are selected initially any file type selected with a check mark when DELETE is pressed will cause ALL ...

Страница 52: ...Do not connect the unit to a PC USB port File transfer must be done using a USB Drive 1 Connect the USB drive to the USB adapter then connect the USB adapter to the USB C port at the bottom of the unit 2 Press Home key on the SiteHawk display 3 Select the File Manager icon on the unit s home screen 4 Select Internal Storage SiteHawk Internal storage Local from the drop down menu in the File Manage...

Страница 53: ...save the file onto the USB drive 12 Exit the File Manager 13 Tap Settings on the Home Screen See Figure 40 14 Tap Storage if the storage option is not available see Display Storage Option in Settings on page 45 Figure 40 Unmount USB Storage 15 Scroll to SD Card and tap Unmount shared storage 16 Tap OK 17 You may now remove the USB Drive ...

Страница 54: ...rage option is not visible in the Settings menu perform the following 1 Tap Settings on the Home Screen See Figure 40 on page 44 2 Tap Customize see Figure 40 Figure 41 Customize Setting Menu 3 Select Storage 4 Tap Apply The Storage option should now be visible in the Setting menu ...

Страница 55: ...elect Phone Storage SiteHawk storage Local in the File Manager program 7 Navigate to the location of the file Figure 42 File Selection 8 Select the file to be copied 9 Tap the Share icon 10 Select Bluetooth option for sharing 11 Scan for available devices Note You may need to make the destination device visible to other devices in it s setting s menu 12 Select the destination device from the devic...

Страница 56: ...cotton swab dipped into an isopropyl alcohol solution Ensure connectors are completely dry before making cable connections Charging the Battery The internal battery pack will automatically recharge when the SiteHawk Analyzer is connected to the AC adapter Recharging time from a full discharge is approximately 5 hours with the unit powered off CAUTION Only use the supplied AC adapter to charge the ...

Страница 57: ...ss cover and two screws to secure cover 5 Charge the battery Device Calibration It is recommended that an instrument calibration be performed by a certified service provider at nominal three year intervals Contact Bird Electronic for more information Storage Store the SiteHawk Analyzer in an enclosed case and in an environment that does not exceed values listed in the Specifications section Ensure...

Страница 58: ...ist on SiteHawk Add Cable to Cable List Note cables in the default list cannot be changed using this method 1 Press DTF icon 2 Press CableList option to display the Cable List See Figure 45 Figure 45 Cable List Dialog Box 3 Press Add button to add new cable 4 Scroll to the bottom of the Cable List to see the new entry 5 Press each cell for Cable name Velocity Cable Loss and Frequency to enter the ...

Страница 59: ...elete button to delete cable Save Cable List 1 Press DTF icon 2 Press CableList option to display the Cable List See Figure 45 3 Press Save Figure 47 Save Cable List Dialog Box 4 Press File Name to give the Cable List a unique filename 5 Press SAVE to save the Cable List Recall Cable List Note This procedure is used to load a Cable List different from the Cable List currently displayed 1 Press DTF...

Страница 60: ...he Cable List Editor from SiteHawk page on the Bird Website and save on a PC 2 Copy the file CableList ini from the SiteHawk folder on the SiteHawk See Data Transfer Function on page 43 3 Save the CableList ini file on the PC in the same folder with the Cable List Editor 4 Double Click the CableListEditor exe to launch the editor 5 Click Import and select CableList ini and click Open See Figure 49...

Страница 61: ...50 Cable Parameter Edit Dialog 8 Click OK 9 Repeat step 6 through step 8 until all changes are complete 10 Once all changes are complete click Export Note The Cable List name can be the same as the default or may have a unique name 11 Name the Cable List and click Save 12 Copy the updated Cable List to a USB drive 13 Exit the SiteHawk App on the SiteHawk Analyzer 14 Copy the updated CableList ini ...

Страница 62: ... Firmware link Note Ensure you are downloading the firmware for correct Site Hawk model 4 Download the SiteHawk Firmware XXX apk update file 5 Connect the USB drive to the PC CAUTION Do not connect the unit to a PC USB port File transfer must be done using a USB Drive 6 Transfer the SiteHawk Firmware XXX apk update file to the USB drive 7 Remove the USB drive 8 Connect the USB drive to the USB ada...

Страница 63: ...eyond the scope of those in this chapter should be referred to a qualified service center If the unit needs to be returned for any reason request an Return Material Authorization RMA through the Bird Technologies website All instruments returned must be shipped prepaid and to the attention of the RMA number Bird Service Center 30303 Aurora Road Cleveland Solon Ohio 44139 2794 Fax 440 248 5426 E ma...

Страница 64: ...ertical Divisions 10 Traces per Channel 1 Active Trace Number 1 Number of Sweep Points 201 Stimulus Start Frequency 1 MHz Stimulus Stop Frequency 4 5 GHz Stimulus IF Bandwidth 1 kHz Sweep Range Setting Start Stop Trigger Mode Continuous Table of Calibration Coefficients Empty Error Correction ON Trace Scale 10 dB division Reference Level Value 0 dB Reference Level Position 5 Div Phase Offset 0 Tra...

Страница 65: ...very such claim for breach of these war ranties shall be deemed to be waived by Buyer unless made in writing within ten days from the date of discovery of the defect The above warranties shall not extend to any products or parts thereof which have been subjected to any misuse or neglect damaged by accident rendered defective by reason of improper installation or by the performance of repairs or al...

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