TG8000 Multiformat Test Signal Generator Declassification ...

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TG8000 Multiformat Test Signal Generator Declassication and Security ZZZ Instructions xx www.tektronix.com *P077068800* 077-0688-00

Transcript of TG8000 Multiformat Test Signal Generator Declassification ...

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TG8000Multiformat Test Signal GeneratorDeclassification and Security

ZZZ

Instructions

xx

www.tektronix.com

*P077068800*

077-0688-00

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Copyright © Tektronix. All rights reserved. Licensed software products are owned by Tektronix or its subsidiariesor suppliers, and are protected by national copyright laws and international treaty provisions.

Tektronix products are covered by U.S. and foreign patents, issued and pending. Information in this publicationsupersedes that in all previously published material. Specifications and price change privileges reserved.

TEKTRONIX and TEK are registered trademarks of Tektronix, Inc.

Contacting Tektronix

Tektronix, Inc.14150 SW Karl Braun DriveP.O. Box 500Beaverton, OR 97077USA

For product information, sales, service, and technical support:In North America, call 1-800-833-9200.Worldwide, visit www.tektronix.com to find contacts in your area.

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Table of Contents

Preface .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iii

Clear and sanitize procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Memory devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Troubleshooting.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

How to clear or sanitize a nonfunctional instrument. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

How to recover from clearing or removing memory from the instrument . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

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ii TG8000 Declassification and Security Instructions

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PrefaceThis document describes how to clear or sanitize the data storage (memory)devices in the products listed below. The instructions also describe how todeclassify an instrument that is not functioning. These procedures are useful forcustomers with data security concerns.

Products This document applies to the following components of the TG8000 MultiformatTest Signal Generator:

TG8000 mainframe

GPS7 GPS Synchronization Timecode module

HD3G7 HD 3 Gb/s SDI Video Generator module

SDI7 Dual Channel SD/HD/3G SDI Video Generator module

Required documents To perform the procedures in this document, you will need to have access to theTG8000 manuals listed below. These manuals are available on the Tektronix Website at www.tektronix.com/downloads.

TG8000 Multiformat Test Signal Generator User Manual(Tektronix part number 071-3036-XX; 071-3037-XX, Japanese;071-03038-XX, Russian)

TG8000 Multiformat Test Signal Generator Service Manual(Tektronix part number 077-0687-XX)

Terms The following terms may be used in this document:

Clear. This removes data on media/memory before reusing it in a securedarea. All reusable memory is cleared to deny access to previously storedinformation by standard means of access.

Erase. This is equivalent to clear.

Media storage/data export device. Any of several devices that are used tostore or export data from the instrument, such as a USB port.

Nonvolatile memory. Data is retained when the instrument is powered off.

Power off. Some instruments have a “Standby” mode, in which power isstill supplied to the instrument. For clearing data, putting the instrument inStandby mode does not qualify as powering off. For these products, you musteither push a rear-panel OFF switch or remove the power source from theinstrument.

Remove. This is a physical means to clear the data by removing the memorydevice from the instrument. Instructions are available in the product ServiceManual.

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Sanitize. This eradicates the data from media/memory so that the data cannotbe recovered by other means or technology. This is typically used whenthe device is moved (temporarily or permanently) from a secured area to anonsecured area.

User-modifiable. The user can write to the memory device during normalinstrument operation, using the instrument interface or remote control.

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Memory devicesThe following tables list the volatile and nonvolatile memory devices in themodules. Detailed procedures to clear or sanitize these devices are shownfollowing the tables.

Table 1: Volatile memory devices for the TG8000 mainframe

Type andminimumsize Function

Typeofuserdata

Backedup bybattery

Methodofmodification

Datainputmethod Location

Useraccessible To clear

Tosanitize

Power PCPPC440EPX

Mainprocessor

Dataandsettings

No Indirectly UI,remote,inputsignals

Main / U1 Yes Set poweron preset tofactory, cyclepower

Repeatclearprocessthreetimes

MT47H64M1664Mx16 DDR2SDRAM

Processormemory

Dataandsettings

No Indirectly UI,remote,inputsignals

Main / U33,U34

Yes Set poweron preset tofactory, cyclepower

Repeatclearprocessthreetimes

5M240ZTQFP144CPLD

Decodessignals fromthe processorto generatecontrol linesfor the slots,front panel,and deviceson the board.Registerscontrolaspects ofthe decoding.

Settings No Indirectly UI,remote,inputsignals

Main / U220 Yes Set poweron preset tofactory, cyclepower

Repeatclearprocessthreetimes

EP4CE6BGA256FPGA,270Kbitsembeddedmemory

Phase lockloop control,DDS Clocksine wavegen usessome ofembeddedvolatilememory.

Settings No Indirectly UI,remote,inputsignals

Main / U450 No Set poweron preset tofactory, cyclepower

Repeatclearprocessthreetimes

88E1116RgigabitethernetRGMIItransceiver

10/100/1000EthernetPHY controlregisters,integrateddata FIFObuffer

Data No Indirectly UI,remote

Main / U58 No Set poweron preset tofactory, cyclepower

Repeatclearprocessthreetimes

DAC5571A8-bit DAC

DisplayContrastvoltagecontrol

Settings No Indirectly UI orremote

Main / U43 Yes Set poweron preset tofactory, cyclepower

Repeatclearprocessthreetimes

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Table 1: Volatile memory devices for the TG8000 mainframe (cont.)

Type andminimumsize Function

Typeofuserdata

Backedup bybattery

Methodofmodification

Datainputmethod Location

Useraccessible To clear

Tosanitize

5M240ZTQFP100CPLD

volatilekeypadread-backand LEDdrive controlregisters

Settings No Indirectly UI orremote

Front panel /U1

Yes Set poweron preset tofactory, cyclepower.

Repeatclearprocessthreetimes.

Real TimeClock +128x8 serialNV memory

The RTCfunction is notaccessiblebut the clockruns andwill showthe elapsedtime since theboard wasbuilt. Thememory isused to storeuser networkparameters.

Dataandsettings

Yes Directandindirect

UI orremote

Main / U16 Yes Performthe clearnetworksettingsprocedure.There is noway to clearthe real timeclock.

Removepart orbattery.

Table 2: Nonvolatile memory devices for the TG8000 mainframe

Type andminimum size Function

Typeof userinformationstored

Method ofmodification

Data inputmethod Location

UserAccessible To clear To sanitize

Serial EEPROMAT24C01B 128x8

Processor bootconfiguration data

None None FactoryJTAG

Main / U21 No N/A Remove partfrom boardand destroy.

NOR FlashPC28F512P3064Mx16

Main storagefor processor.ContainsOperating system,applicationprograms,MAC address,instrument familytype, FPGAprogrammingfiles, signal, logo,text overlay andpicture files.

Bothdata andsettings

Directly andindirectly

Presets aresaved fromUI, filesand presetsare savedfrom USB orethernet.

Main / U101, U102 Yes Perform thedelete presetsand user filesfrom memoryprocedure.

Remove partfrom boardand destroy.

NAND FlashK9F1G08U0A128Mx8

Not used. None None None Main / U103 No N/A N/A

Serial MRAMMR25H25632Kx8

Oven calibrationdata

Settings Indirectly Performcalibration

Main / U22 Yes Performcalibration

Remove partfrom boardand destroy.

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Table 2: Nonvolatile memory devices for the TG8000 mainframe (cont.)

Type andminimum size Function

Typeof userinformationstored

Method ofmodification

Data inputmethod Location

UserAccessible To clear To sanitize

CPLD,5M240ZTQFP144,8192 bits flash

Decodes signalsfrom the processorto generate controllines for the slots,front panel, anddevices on theboard. NV flash isnot used

Settings Indirectly Softwareupgrade

Main / U220 No N/A N/A

Serial EEPROMAT24C01B 128x8

Run time datafor power supplyshowing timeof use andtemperature / timerelated use

Data Indirectly Automaticover time

Power adapter / U1 Yes None Removeparts fromboard anddestroy.

CPLD5M240ZTQFP100,8192 bits flashmemory not used

Interfaces withsignals fromthe main PLD,drives LEDs andreads the buttons.nonvolatile flashmemory is notused.

Settings Indirectly Softwareupgrade

Front panel / U1 No N/A N/A

Table 3: Nonvolatile memory devices for the GPS7 module

Type andminimum size Function

Maycontainuserdata 1

Data inputmethod Location To clear To sanitize

Flash memory4 M X 8

Configuration ofFPGA

No Written byprocessorsystem fromTG8000 mainboard

U0331 None N/A

No customerinformation isstored in thisflash memory

Flash memory4 M X 8

Calibration for themodule

Stores leapsecondinformation

Yes. Thevalues area functionof howthe usercalibratesthe moduleand whenit was lastreceivingthe GPSsignal

Stored duringcalibration

Stores leapsecondinformationobtained bysatellite

U0332 Manually calibrate themodule back to thefactory default values

Allow the moduleto receive satelliteinformation for30 minutes to updatethe leap second field

Remove anddestroy thememory deviceor destroy theentire board

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Table 3: Nonvolatile memory devices for the GPS7 module (cont.)

Type andminimum size Function

Maycontainuserdata 1

Data inputmethod Location To clear To sanitize

Flash memory4 M X 8

unused No None U0741 None None

GPS receiverassembly

Calculates timingand positioninformation

Yes ifoperated infixed mode

Location isstored whenoperated infixed mode

Mounts above the mainmodule board andconnects to J12 witha ribbon cable, and to theantenna connector on therear panel

Save a position from alocation different fromthe one that was lastsaved. This will erasethe previous positionand save the new one

Remove anddestroy themodule ordestroy the entireboard

1 During normal instrument operation.

Table 4: Nonvolatile memory devices for the HD3G7 module

Type andminimum size Function

Maycontainuserdata 1

Data inputmethod Location To clear To sanitize

Flash 32 M x 16 FPGAconfiguration

No Written byprocessorsystem onTG8000 mainboard usingPLD U226

389-4093-00 board, U321 None. A softwareupgrade will erase andreprogram this part

Remove partfrom board anddestroy

PLD with internal512 x16 byte UserFlash Memory

PLD addressesdecoding, memorynot used

No Programmed atfactory

389-4093-00 board, U226 None Remove partfrom board anddestroy

DDR2 32 M x 16 Unused No None 389-4093-00 board,U618, U711

Remove power Remove partfrom board anddestroy

SRAM 256 K x 16 Unused No None 389-4093-00 boardU521, U0521,U621, U0621,U622, U0622

Remove power Remove partfrom board anddestroy

100 stepElectronicPotentiometerwith EEPROM

Holds calibrationdata

Yes,Indirectly

Calibrate outputlevels

389-4096-00 output boardU0113, U0114

Set output level tominimum

Set output tomax and minthree times thenleave at min.

FPGA with 60 KLogic elementsand 2.5Mbits ofRAM

Generates signalsfrom logic andmemory

Yes,indirectlyby signalselection

Programed fromflash at bootup,changes stateas instrumentoperates

389-4093-00 board, U811 Remove power Set instrumentto power up onfactory defaultand cycle powerthree times

128 K x 8EEPROM

Unused No None 389-4093-00 board, U224 None Remove part anddestroy

1 During normal instrument operation.

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Table 5: Nonvolatile memory devices for the SDI7 module

Type andminimum size Function

Maycontainuserdata 1

Data inputmethod Location To clear To sanitize

Flash 32 M x 16 FPGAconfiguration,unique moduleID, option key

Yes Written byprocessorsystem onTG8000 mainboard usingPLD U226.

User can enteroption keystring from UI.String mustbe correct toenable 3Goption.

389-4093-00 board, U321 Overwrite the optionstring with dummycharacters.

Remove partfrom board anddestroy

PLD with internal512 x16 byte userflash memory

PLD addressesdecoding, memorynot used

No Programmed atfactory

389-4093-00 board, U226 None Remove partfrom board anddestroy

DDR2 32 M x 16 Used for framepicture and logooverlay functions

Yes Load framepicture andor logo BMPinto mainframe,then selectframe pictureor logo overlayfunction

389-4093-00 board,U618, U711

Remove power Remove partfrom board anddestroy

SRAM 256 K x 16 Used for text andcircle overlayfunctions

Yes Load text file tomainframe orenter text stringfrom keyboard

389-4093-00 boardU521, U0521,U621, U0621,U622, U0622

If text is saved inpower on preset, thenshould restore factorypreset, save as poweron preset, then cyclepower three times

Remove partfrom board anddestroy

Dual 2048 stepdigitalpotentiometer withEEPROM withthe two parts inparallel, limitedin software to100 steps of range

Holds calibrationdata

Yes,Indirectly

Calibrate outputlevels

389-4485-00 output boardU1 and U5

Store calibration levelat mid-scale of 50

Store calibrationlevel at min andmax three timesthen store at midscale of 50

FPGA with 90 KLogic elementsand 4.5 Mb ofRAM

Generates signalsfrom logic andmemory

Yes,indirectlyby signalselection

Programedfrom flashat bootup,changes stateas instrumentoperates

389-4093-00 board, U811 Remove power Set instrumentto power up onfactory defaultand cycle powerthree times

128 K x 8EEPROM

Unused No None 389-4093-00 board, U224 None Remove part anddestroy

1 During normal instrument operation.

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To restore the factorydefault settings

Restore the instrument to the factory default settings as follows:

1. Press theMODULE button until TG8000 : PRESET appears.

2. Press the ENTER button. You will see the words RECALL appear.

3. Press the left (◄) or right (►) arrow button until Factory Default appears.

4. Press the ENTER button.

5. Press the BACK button or theMODULE button to exit the Recall presetmenu.

To set the factory defaultsettings as the power on

state

1. Perform the previous procedure to restore the factory preset/default state.

2. Press theMODULE button until TG8000 : PRESET appears.

3. Press the ENTER button. You will see TG8000 : PRESET : RECALLdisplayed.

4. Press the up (▲) or down (▼) arrow button to select TG8000 : PRESET: SAVE

5. Press the left (◄) or right (►) arrow button until the display shows TG8000:PRESET : SAVE Power On Default.

6. Press the ENTER button. The display will flash as it saves the preset.

7. Press the BACK button to exit the preset menu.

To clear the networksettings

1. Press theMODULE button until TG8000 : PRESET appears.

2. Press the up (▲) or down (▼) arrow button to select TG8000 : UTILITY,and then press the ENTER button.

3. Press the up (▲) or down (▼) arrow button to select TG8000 : UTILITY: NETWORK.

4. Press the left (◄) or right (►) arrow button to select Setup, and then pressthe ENTER button.

5. Press the up (▲) or down (▼) arrow button to select TG8000 : UTIL : NETSETUP : DHCP.

6. Press the left (◄) or right (►) arrow button to select Disable.

NOTE. The DHCP feature must be disabled before you can clear the networksettings stored in the instrument memory.

7. Press the up (▲) or down (▼) arrow button to select TG8000 : UTIL : NETSETUP : IP ADDRESS, and then press the ENTER button.

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8. Use the left (◄) or right (►) arrow buttons to select each number in the IPaddress, and use the up (▲) or down (▼) arrow buttons to change the addressvalues to a safe default number such as all zeros. Press the ENTER buttonto save the changes.

9. Repeat steps 7 and 8 for the Subnet Mask and Gateway addresses.

10. Press the BACK button to exit the NETWORK submenu.

To delete presets and userfiles from memory

Backup existing presets or user files. If you want to backup your presets or userfiles before you delete them so that you can restore them at a later time, performthe following steps. Otherwise, proceed to step 13.

1. Connect a USB drive to the TG8000 generator.

2. Press theMODULE button to select TG8000 : PRESET.

3. Press the up (▲) or down (▼) arrow button to select TG8000 : UTILITY,and then press the ENTER button.

4. Verify the status of the USB drive:

a. Press the up (▲) or down (▼) arrow button to select TG8000 : UTILITY: USB (status).

b. Verify that the USB status isMounted.

c. If the status is Not Mounted, press the ENTER button to mount the USBdrive.

5. Press the up (▲) or down (▼) arrow button to select TG8000 : UTILITY :BACKUP/RESTORE.

6. Press the left (◄) or right (►) arrow button to select one of the following:

Backup Presets to USB: Backs up only the instrument presets to the USBdrive. If you are backing up only presets, you will need up to 1 MB offree space on the USB drive.

Backup All User Data to USB: Backs up all user data to the USB drive.When all user data is backed up, every user file except for the FPGAconfiguration files will be copied to the USB drive. User files are definedas any file that exists in the /app/F0 directory on the instrument. The filesin this directory can include presets, signal files, frame picture files, logofiles, sequence files, and for the SDI7 module, can also include text andfont files. The user data files do not include the application software orany Linux files.

NOTE. If you are backing up all of the user data in the instrument, you willneed up to 96 MB of free space on the USB drive.

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7. Press the ENTER button to start the selected backup operation.

8. A warning message is displayed asking you to verify the operation. Press theENTER button to proceed or press the BACK button to cancel the operation.

9. Monitor the progress of the file copy operation:

a. During the first stage of the copy process, the display shows the namesof the files as they are copied. Depending on the size of the files beingcopied, this may take a couple of minutes.

b. When all of the files have been copied, the message “Finishing copy...” isdisplayed while the file system buffers are emptied. This message mayappear for a couple of minutes.

c. When the backup operation is complete, the message “Backup completedsuccessfully” is displayed before the menu display returns to normal.

NOTE. If the USB drive runs out of memory before the backup operationis complete, the operation will copy as much data as it can and will thendisplay an error message stating that the backup operation was incompletebecause the drive or device is full. Press the ENTER or BACK button to clearthe error message.

10. After the backup operation is complete, press the up (▲) or down (▼) arrowbutton to select TG8000 : UTILITY : USB (Mounted).

11. Press the ENTER button to unmount the USB drive. After the message “Youmay now safely remove the USB drive” is displayed, the menu readout shouldchange to TG8000 : UTILITY : USB (Not mounted).

12. Remove the USB drive from the instrument.

Delete the presets and user files from the instrument.

13. Connect the instrument and a computer using an Ethernet connection asdescribed in the TG8000 User Manual.

14. On the computer, open an FTP client such as Windows Explorer.

15. In the Windows Explorer command box, enter “ftp://IP address”, where IPaddress is the network address assigned to the TG8000 generator.

NOTE. Some FTP clients may ask for login credentials. In this case, login with auser name of “anonymous” and no password.

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16. The Windows Explorer window should immediately connect to the instrumentand show the directory structure as shown below.

Figure 1: Example FTP view of the instrument file structure

17. In the CPU directory, delete any preset files.

18. In the SEQUENCE directory, delete any sequence files.

19. In each of the module directories, delete all of the preset files and anyuser-created picture, logo, text, or signal files.

NOTE. In addition to the user-created files, the module directories will alsocontain the factory default files for the standard signals and logos that aresupplied with the instrument. You do not need to delete the factory default files.

20. After you have deleted the desired files, close the FTP window.

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Troubleshooting

How to clear or sanitize a nonfunctional instrumentTo sanitize a nonfunctional instrument, remove the Main board and return theinstrument to Tektronix for installation of a new Main board.

How to recover from clearing or removing memory from the instrumentThe procedure to recover from clearing or removing memory depends on whetherthe memory was on a module or on the instrument mainframe. Perform theappropriate procedure as described in this section.

To recover from clearing orremoving memory from a

module

Perform the following procedure to recover a module:

1. Power on the module.

2. Calibrate the module as instructed in the TG8000 Multiformat Test SignalGenerator Service Manual (Tektronix part number 077-0687-XX).

3. Reconfigure the module for your specific application. You can findconfiguration information in the TG8000 Multiformat Test Signal GeneratorUser Manual (Tektronix part number 071-3036-XX, English; 071-3037-XX,Japanese; 071–03080-XX Russian).

4. For the GPS7 module only:

a. Connect a GPS signal to the module and let it run for 30 minutes. Thisallows the leap second and position information to be reacquired.

b. You are finished with the GPS7 module recovery; the GPS7 module willreload the system software on start up.

5. For the HD3G7 module only:

a. Press theMODULE button until you see the HD3G7 module main menu.

b. Press and hold the ENTER button until “Upgrade HD3G7 FPGA”appears.

c. Press the ENTER button to upgrade the module.

d. The upgrade will take approximately three minutes. After it is complete,remove power from the TG8000 and then reapply power to reboot thesystem.

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6. For the SDI7 module only, verify that Option 3G is enabled:

NOTE. You need to perform the following steps only if the SDI7 module hadOption 3G enabled prior to the module being sanitized.

a. Press theMODULE button until TG8000: PRESET is displayed.

b. Press the up (▲) or down (▼) arrow button to select TG8000: UTILITY,and then press the ENTER button.

c. Press the up (▲) or down (▼) arrow button until TG8000: UTILITY:OPTIONS ENABLED is displayed.

d. The second line of the display indicates the option status:

SDI7[slot number] None indicates that Option 3G is not enabled

SDI7[slot number] 3G indicates that Option 3G is enabled

NOTE. If more than one SDI7 module is installed in the mainframe, use theleft (◄) or right (►) arrow button to display the option status of the desiredSDI7 module.

e. If Option 3G is not enabled, you must reenter the option key for theSDI7 module as described in the TG8000 Multiformat Test SignalGenerator User Manual.

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Troubleshooting

To recover from clearingor removing memory from

the mainframe

Perform the following procedure to recover a module:

1. Power on the instrument with a GPS7 module installed.

2. Calibrate the mainframe oscillator oven as instructed in the TG8000Multiformat Test Signal Generator User Manual (Tektronix part number071-3036-XX; 071-3037-XX, Japanese; 071-03038-XX Russian).

3. Configure the network parameters for the instrument as instructed in theTG8000 Multiformat Test Signal Generator User Manual (Tektronix partnumber 071-3036-XX; 071-3037-XX, Japanese; 071-03038-XX Russian).

4. If you backed up the presets and user data files onto a USB drive before youremoved the mainframe memory, restore the presets or user data files asdescribed below:

a. Connect the USB drive to the TG8000 generator that you used to back upthe presets or user data files.

b. Press theMODULE button to select TG8000 : PRESET.

c. Press the up (▲) or down (▼) arrow button to select TG8000 :UTILITY, and then press the ENTER button.

d. Press the up (▲) or down (▼) arrow button to select TG8000 : UTILITY: USB (status).

e. Verify that the USB status isMounted.

f. If the status is Not Mounted, press the ENTER button to mount the USBdrive.

g. Press the up (▲) or down (▼) arrow button to select TG8000 : UTILITY: BACKUP/RESTORE.

h. Press the left (◄) or right (►) arrow button to select Restore Presetsfrom USB or Restore All User Data from USB.

i. Press the ENTER button to start the selected restore operation.

j. A warning message is displayed asking you to verify the operation. Pressthe ENTER button to proceed or press the BACK button to cancel theoperation.

k. During the first stage of the copy process, the display shows the namesof the files as they are copied. Depending on the size of the files beingcopied, this may take a couple of minutes.

l. When all of the files have been copied, the message “Finishing copy...” isdisplayed while the file system buffers are emptied. This message mayappear for a couple of minutes.

m. When the restore operation is complete, the message “Restore completedsuccessfully” is displayed before the menu display returns to normal.

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n. After the restore operation is complete, press the up (▲) or down (▼)arrow button to select TG8000 : UTILITY : USB (Mounted).

o. Press the ENTER button to unmount the USB drive. After the message“You may now safely remove the USB drive” is displayed, the menureadout should change to TG8000 : UTILITY : USB (Not mounted).

p. Remove the USB drive from the instrument.

5. If you did not restore the presets or user data files from a USB drive in step 4,then adjust the display contrast as follows:

a. Press theMODULE button to select TG8000 : PRESET.

b. Press the up (▲) or down (▼) arrow button to select TG8000 :UTILITY, and then press the ENTER button.

c. Press the up (▲) or down (▼) arrow button to select TG8000 :UTILITY : LCD CONTRAST.

d. Press the left (◄) or right (►) arrow button to set the display contrastto the desired level.

NOTE. Perform the following steps if you want to save the display contrastsetting so that it will be restored when the instrument is powered on.

e. Press theMODULE button to select TG8000 : PRESET, and then pressthe ENTER button.

f. Press the up (▲) or down (▼) arrow button to select TG8000 :PRESET : SAVE.

g. Press the left (◄) or right (►) arrow button to select Power On Default.

h. Press the ENTER button to save the current instrument settings as thepower on default.

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