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<!-- Creation date: 2013-03-01T03:42:48Z -->
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  <element name="CashPaidDuringPeriodForAbstract" id="ter_CashPaidDuringPeriodForAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
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  <element name="ChangeInAccountingPrincipleLineItems" id="ter_ChangeInAccountingPrincipleLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
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  <element name="ChangeOfBusinessAcquisitionContingentConsiderationAtFairValue" id="ter_ChangeOfBusinessAcquisitionContingentConsiderationAtFairValue" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
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  <element name="CustomerRelationshipsAndServiceAndSoftwareMaintenanceContractsMember" id="ter_CustomerRelationshipsAndServiceAndSoftwareMaintenanceContractsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
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  <element name="DebtInstrumentConversionSharePrice" id="ter_DebtInstrumentConversionSharePrice" type="num:perShareItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
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  <element name="DebtInstrumentWarrantTransactionReceived" id="ter_DebtInstrumentWarrantTransactionReceived" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
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  <element name="DisclosureBlackScholesOptionPricingModelAbstract" id="ter_DisclosureBlackScholesOptionPricingModelAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
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  <element name="DisclosureChangesInCarryingAmountOfGoodwillByReportingUnitsAbstract" id="ter_DisclosureChangesInCarryingAmountOfGoodwillByReportingUnitsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
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  <element name="DisclosureGoodwillAndIntangibleAssetsAdditionalInformationAbstract" id="ter_DisclosureGoodwillAndIntangibleAssetsAdditionalInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
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  <element name="DisclosureNonCancelableOperatingLeaseCommitmentsAbstract" id="ter_DisclosureNonCancelableOperatingLeaseCommitmentsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureOperatingSegmentGeographicAndSignificantCustomerInformationAdditionalInformationAbstract" id="ter_DisclosureOperatingSegmentGeographicAndSignificantCustomerInformationAdditionalInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
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  <element name="DisclosureProFormaResultsUnderAcquisitionsAbstract" id="ter_DisclosureProFormaResultsUnderAcquisitionsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosurePropertyPlantAndEquipmentAbstract" id="ter_DisclosurePropertyPlantAndEquipmentAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosurePropertyPlantAndEquipmentAdditionalInformationAbstract" id="ter_DisclosurePropertyPlantAndEquipmentAdditionalInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
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  <element name="DisclosureSavingsPlanAdditionalInformationAbstract" id="ter_DisclosureSavingsPlanAdditionalInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureScheduleOfAmortizableIntangibleAssetsAbstract" id="ter_DisclosureScheduleOfAmortizableIntangibleAssetsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
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  <element name="DisclosureScheduleOfAmountsRecordedWithinStatementOfFinancialPositionAbstract" id="ter_DisclosureScheduleOfAmountsRecordedWithinStatementOfFinancialPositionAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureScheduleOfAvailableForSaleMarketableSecuritiesAbstract" id="ter_DisclosureScheduleOfAvailableForSaleMarketableSecuritiesAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureScheduleOfCarryingAmountsAndFairValuesOfFinancialInstrumentAbstract" id="ter_DisclosureScheduleOfCarryingAmountsAndFairValuesOfFinancialInstrumentAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureScheduleOfChangesInFairValueOfLevelThreeContingentConsiderationAbstract" id="ter_DisclosureScheduleOfChangesInFairValueOfLevelThreeContingentConsiderationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureScheduleOfComponentsOfDeferredTaxAssetsLiabilitiesAbstract" id="ter_DisclosureScheduleOfComponentsOfDeferredTaxAssetsLiabilitiesAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureScheduleOfCondensedConsolidatedBalanceSheetsAbstract" id="ter_DisclosureScheduleOfCondensedConsolidatedBalanceSheetsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureScheduleOfCondensedConsolidatedStatementsOfCashFlowsAbstract" id="ter_DisclosureScheduleOfCondensedConsolidatedStatementsOfCashFlowsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureScheduleOfCondensedConsolidatedStatementsOfComprehensiveIncomeAbstract" id="ter_DisclosureScheduleOfCondensedConsolidatedStatementsOfComprehensiveIncomeAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureScheduleOfCondensedConsolidatedStatementsOfOperationsAbstract" id="ter_DisclosureScheduleOfCondensedConsolidatedStatementsOfOperationsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
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  <element name="NineteenNinetySixEmployeeStockPurchasePlanMember" id="ter_NineteenNinetySixEmployeeStockPurchasePlanMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NonUSPensionSettlement" id="ter_NonUSPensionSettlement" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NumberOfBusinessDaysAfterConsecutiveTradingDaysForAsMeasurementPeriodForConversionOfNotes" id="ter_NumberOfBusinessDaysAfterConsecutiveTradingDaysForAsMeasurementPeriodForConversionOfNotes" type="xbrli:positiveIntegerItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NumberOfConsecutiveTradingDaysBeforeBusinessDaysForAsMeasurementPeriodForConversionOfNotes" id="ter_NumberOfConsecutiveTradingDaysBeforeBusinessDaysForAsMeasurementPeriodForConversionOfNotes" type="xbrli:positiveIntegerItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NumberOfCustomerAccountedForTenPercentOrGreaterRevenue" id="ter_NumberOfCustomerAccountedForTenPercentOrGreaterRevenue" type="xbrli:integerItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NumberOfFormerEmployees" id="ter_NumberOfFormerEmployees" type="xbrli:integerItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="OperatingLossCarryforwardsExpiringBeyondTwoThousandTwentySixMember" id="ter_OperatingLossCarryforwardsExpiringBeyondTwoThousandTwentySixMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="OperatingLossCarryforwardsExpiringTwoThousandEighteenToTwoThousandTwentyThreeMember" id="ter_OperatingLossCarryforwardsExpiringTwoThousandEighteenToTwoThousandTwentyThreeMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="OperatingLossCarryforwardsExpiringTwoThousandFifteenMember" id="ter_OperatingLossCarryforwardsExpiringTwoThousandFifteenMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="OperatingLossCarryforwardsExpiringTwoThousandFourteenMember" id="ter_OperatingLossCarryforwardsExpiringTwoThousandFourteenMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="OperatingLossCarryforwardsExpiringTwoThousandSeventeenMember" id="ter_OperatingLossCarryforwardsExpiringTwoThousandSeventeenMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="OperatingLossCarryforwardsExpiringTwoThousandSixteenMember" id="ter_OperatingLossCarryforwardsExpiringTwoThousandSixteenMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="OperatingLossCarryforwardsExpiringTwoThousandThirteenMember" id="ter_OperatingLossCarryforwardsExpiringTwoThousandThirteenMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
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  <element name="OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostCreditArisingDuringPeriodTaxEffect" id="ter_OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostCreditArisingDuringPeriodTaxEffect" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostsCreditAmortizationAndCreditArisingDuringPeriodTaxEffect" id="ter_OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostsCreditAmortizationAndCreditArisingDuringPeriodTaxEffect" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostsCreditsAndAmortizationArisingDuringPeriodNetOfTax" id="ter_OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostsCreditsAndAmortizationArisingDuringPeriodNetOfTax" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="OtherForeignMember" id="ter_OtherForeignMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PassiveAndActiveFixedIncomeMember" id="ter_PassiveAndActiveFixedIncomeMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PaymentForContingentConsideration" id="ter_PaymentForContingentConsideration" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PaymentOfContingentConsideration" id="ter_PaymentOfContingentConsideration" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PensionAndOtherPostretirementBenefitPlansCategorizedByGeographicalAxis" id="ter_PensionAndOtherPostretirementBenefitPlansCategorizedByGeographicalAxis" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:dimensionItem"/>
  <element name="PensionAndOtherPostretirementBenefitPlansCategorizedByGeographicalDomain" id="ter_PensionAndOtherPostretirementBenefitPlansCategorizedByGeographicalDomain" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PensionAndOtherPostretirementDefinedBenefitPlansAccruedEmployeesCompensationAndWithholdingsCurrentAndNoncurrent" id="ter_PensionAndOtherPostretirementDefinedBenefitPlansAccruedEmployeesCompensationAndWithholdingsCurrentAndNoncurrent" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
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  <element name="PercentageOfAwardVestingOnFirstAnniversaryOfGrantDate" id="ter_PercentageOfAwardVestingOnFirstAnniversaryOfGrantDate" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfCommonStockAcquired" id="ter_PercentageOfCommonStockAcquired" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfEmployerContributionsVestedPerYear" id="ter_PercentageOfEmployerContributionsVestedPerYear" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfEmployerMatchOnEmployeeContribution" id="ter_PercentageOfEmployerMatchOnEmployeeContribution" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfPurchasePriceOfStockOnLesserOfFairMarketValueDuringFirstDayOrLastDayOfOfferingPeriod" id="ter_PercentageOfPurchasePriceOfStockOnLesserOfFairMarketValueDuringFirstDayOrLastDayOfOfferingPeriod" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfWarrantPriceInExcessOfClosingPriceOfCommonStock" id="ter_PercentageOfWarrantPriceInExcessOfClosingPriceOfCommonStock" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentOfIncreaseInConversionPrice" id="ter_PercentOfIncreaseInConversionPrice" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PrepaidAndOtherCurrentAssetsMember" id="ter_PrepaidAndOtherCurrentAssetsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PreparationOfFinancialStatementsAndUseOfEstimatesPolicyTextBlock" id="ter_PreparationOfFinancialStatementsAndUseOfEstimatesPolicyTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
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  <element name="PrincipalAmountPercentage" id="ter_PrincipalAmountPercentage" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PropertyPlantAndEquipmentUsefulLifeDescription" id="ter_PropertyPlantAndEquipmentUsefulLifeDescription" type="xbrli:stringItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="QOneTwoThousandElevenActivityMember" id="ter_QOneTwoThousandElevenActivityMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="QTwoTwoThousandElevenActivityMember" id="ter_QTwoTwoThousandElevenActivityMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="QTwoTwoThousandTenActivityMember" id="ter_QTwoTwoThousandTenActivityMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="QTwoTwoThousandTwelveMember" id="ter_QTwoTwoThousandTwelveMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
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  <element name="QuarterFourTwoThousandTenActivityMember" id="ter_QuarterFourTwoThousandTenActivityMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
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  <element name="QuarterlyFinancialInformationTable" id="ter_QuarterlyFinancialInformationTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="QuarterOneTwoThousandElevenActionsMember" id="ter_QuarterOneTwoThousandElevenActionsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="QuarterOneTwoThousandTenActionsMember" id="ter_QuarterOneTwoThousandTenActionsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="QuarterOneTwoThousandTenActivityMember" id="ter_QuarterOneTwoThousandTenActivityMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="QuarterThreeTwoThousandTenActionsMember" id="ter_QuarterThreeTwoThousandTenActionsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="QuarterThreeTwoThousandTenActivityMember" id="ter_QuarterThreeTwoThousandTenActivityMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
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  <element name="QuarterTwoTwoThousandElevenActionsMember" id="ter_QuarterTwoTwoThousandElevenActionsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="QuarterTwoTwoThousandTenActionsMember" id="ter_QuarterTwoTwoThousandTenActionsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RangeFourMember" id="ter_RangeFourMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RangeOneMember" id="ter_RangeOneMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RangeThreeMember" id="ter_RangeThreeMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RangeTwoMember" id="ter_RangeTwoMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RemainingAccrualForLeasePayments" id="ter_RemainingAccrualForLeasePayments" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RestOfWorldMember" id="ter_RestOfWorldMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RestrictedStockAwardsVestingPeriodOneYear" id="ter_RestrictedStockAwardsVestingPeriodOneYear" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RestrictedStockAwardsVestingPeriodYears" id="ter_RestrictedStockAwardsVestingPeriodYears" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
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  <element name="RestructuringActionDomain" id="ter_RestructuringActionDomain" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RestructuringAndOtherCharges" id="ter_RestructuringAndOtherCharges" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
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  <element name="SavingsPlanLineItems" id="ter_SavingsPlanLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SavingsPlanMaximumPercentageOfEmployeesContributionAllowable" id="ter_SavingsPlanMaximumPercentageOfEmployeesContributionAllowable" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SavingsPlanMember" id="ter_SavingsPlanMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ScheduleOfAccruedLiabilitiesLineItems" id="ter_ScheduleOfAccruedLiabilitiesLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ScheduleOfAccruedLiabilitiesTable" id="ter_ScheduleOfAccruedLiabilitiesTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="ScheduleOfBenefitObligationsWeightedAverageAssumptionsLineItems" id="ter_ScheduleOfBenefitObligationsWeightedAverageAssumptionsLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ScheduleOfBenefitObligationsWeightedAverageAssumptionsTable" id="ter_ScheduleOfBenefitObligationsWeightedAverageAssumptionsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="ScheduleOfCarryingAmountsAndFairValuesOfFinancialInstrumentsTableTextBlock" id="ter_ScheduleOfCarryingAmountsAndFairValuesOfFinancialInstrumentsTableTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ScheduleOfCondensedConsolidatedBalanceSheetsTableTextBlock" id="ter_ScheduleOfCondensedConsolidatedBalanceSheetsTableTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ScheduleOfCondensedConsolidatedStatementsOfCashFlowsTableTextBlock" id="ter_ScheduleOfCondensedConsolidatedStatementsOfCashFlowsTableTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ScheduleOfCondensedConsolidatedStatementsOfComprehensiveIncomeTableTextBlock" id="ter_ScheduleOfCondensedConsolidatedStatementsOfComprehensiveIncomeTableTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ScheduleOfCondensedConsolidatedStatementsOfOperationsTableTextBlock" id="ter_ScheduleOfCondensedConsolidatedStatementsOfOperationsTableTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ScheduleOfDeferredRevenueAndCustomerAdvancesTableTextBlock" id="ter_ScheduleOfDeferredRevenueAndCustomerAdvancesTableTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ScheduleOfDefinedBenefitPlanAssetAllocationTargetsLineItems" id="ter_ScheduleOfDefinedBenefitPlanAssetAllocationTargetsLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ScheduleOfDefinedBenefitPlanAssetAllocationTargetsTable" id="ter_ScheduleOfDefinedBenefitPlanAssetAllocationTargetsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="ScheduleOfExtendedProductWarrantyLiabilityTableTextBlock" id="ter_ScheduleOfExtendedProductWarrantyLiabilityTableTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ScheduleOfNetIncomeLossPerCommonShareTable" id="ter_ScheduleOfNetIncomeLossPerCommonShareTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="ScheduleOfNetPeriodicBenefitCostsWeightedAverageAssumptionsLineItems" id="ter_ScheduleOfNetPeriodicBenefitCostsWeightedAverageAssumptionsLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ScheduleOfNetPeriodicBenefitCostsWeightedAverageAssumptionsTable" id="ter_ScheduleOfNetPeriodicBenefitCostsWeightedAverageAssumptionsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="ScheduleOfPensionAndOtherPostretirementBenefitsRecognizedInAccumulatedOtherComprehensiveIncomeLossLineItems" id="ter_ScheduleOfPensionAndOtherPostretirementBenefitsRecognizedInAccumulatedOtherComprehensiveIncomeLossLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ScheduleOfPensionAndOtherPostretirementBenefitsRecognizedInAccumulatedOtherComprehensiveIncomeLossTable" id="ter_ScheduleOfPensionAndOtherPostretirementBenefitsRecognizedInAccumulatedOtherComprehensiveIncomeLossTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="ScheduleOfPensionExpectedFutureBenefitPaymentsLineItems" id="ter_ScheduleOfPensionExpectedFutureBenefitPaymentsLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ScheduleOfPensionExpectedFutureBenefitPaymentsTable" id="ter_ScheduleOfPensionExpectedFutureBenefitPaymentsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="ScheduleOfPensionPlanAssetsByFairValueLineItems" id="ter_ScheduleOfPensionPlanAssetsByFairValueLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ScheduleOfPensionPlanAssetsByFairValueTable" id="ter_ScheduleOfPensionPlanAssetsByFairValueTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="ScheduleOfPropertyPlantAndEquipmentTableTextBlock" id="ter_ScheduleOfPropertyPlantAndEquipmentTableTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ScheduleOfSavingsPlanTable" id="ter_ScheduleOfSavingsPlanTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="ScheduleOfSegmentReportingInformationBySegmentCharges" id="ter_ScheduleOfSegmentReportingInformationBySegmentCharges" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAggregateIntrinsicValueTableTextBlock" id="ter_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAggregateIntrinsicValueTableTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageContractualTermsTableTextBlock" id="ter_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageContractualTermsTableTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardTotalSharesAvailableTableTextBlock" id="ter_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardTotalSharesAvailableTableTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ScheduleOfTargetAssetAllocationTableTextBlock" id="ter_ScheduleOfTargetAssetAllocationTableTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ScheduleOfTotalIncomeTaxProvisionBenefitTableTextBlock" id="ter_ScheduleOfTotalIncomeTaxProvisionBenefitTableTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ScheduleOfWeightedAverageAssumptionsToDetermineEmployeeBenefitObligationsTableTextBlock" id="ter_ScheduleOfWeightedAverageAssumptionsToDetermineEmployeeBenefitObligationsTableTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
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  <element name="ScheduleOfWeightedAveragePensionAssetAllocationsByCategoryTableTextBlock" id="ter_ScheduleOfWeightedAveragePensionAssetAllocationsByCategoryTableTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
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  <element name="SemiconductorTestAndSystemTestGroupMember" id="ter_SemiconductorTestAndSystemTestGroupMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SemiconductorTestMember" id="ter_SemiconductorTestMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
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  <element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumShareValueAuthorizedForPurchaseUnderEmployeeStockPurchasePlan" id="ter_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumShareValueAuthorizedForPurchaseUnderEmployeeStockPurchasePlan" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAssumedFromAcquisitionInPeriodWeightedAverageExercisePrice" id="ter_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAssumedFromAcquisitionInPeriodWeightedAverageExercisePrice" type="num:perShareItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAssumedFromAcquisitionsInPeriod" id="ter_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAssumedFromAcquisitionsInPeriod" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
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  <element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationTerm" id="ter_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationTerm" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
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  <element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardsOptionsGrantsInPeriod" id="ter_ShareBasedCompensationArrangementByShareBasedPaymentAwardsOptionsGrantsInPeriod" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingPercentageUponOneYearAnniversaryOfDateOfGrant" id="ter_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingPercentageUponOneYearAnniversaryOfDateOfGrant" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
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  <element name="SharesOfStockIssuedDuringPeriodShareBasedCompensationNetOfSharesWithheldForTaxes" id="ter_SharesOfStockIssuedDuringPeriodShareBasedCompensationNetOfSharesWithheldForTaxes" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
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  <element name="StockBasedCompensationMember" id="ter_StockBasedCompensationMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="StockCompensationPlansAndEmployeeStockPurchasePlanPolicyTextBlock" id="ter_StockCompensationPlansAndEmployeeStockPurchasePlanPolicyTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="StockIssuedDuringPeriodSharesSaleOfStockAndExerciseOfStockOptions" id="ter_StockIssuedDuringPeriodSharesSaleOfStockAndExerciseOfStockOptions" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
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  <element name="StockOptionsIssuedInPurchaseAcquisition" id="ter_StockOptionsIssuedInPurchaseAcquisition" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="StockPurchaseRightsMember" id="ter_StockPurchaseRightsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="StockRepurchaseProgramLineItems" id="ter_StockRepurchaseProgramLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
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  <element name="StockRepurchaseProgramTextBlock" id="ter_StockRepurchaseProgramTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
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  <element name="SummaryOfSignificantAccountingPoliciesTable" id="ter_SummaryOfSignificantAccountingPoliciesTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="SystemsTestGroupMember" id="ter_SystemsTestGroupMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TaiwanDollarMember" id="ter_TaiwanDollarMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TaxBenefitFromStockOptionsExercisedAndVestingOfRestrictedStockAwardsAndUnits" id="ter_TaxBenefitFromStockOptionsExercisedAndVestingOfRestrictedStockAwardsAndUnits" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TaxCreditCarryforwardExpirationYear" id="ter_TaxCreditCarryforwardExpirationYear" type="xbrli:gYearItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
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  <element name="TermOfLoan" id="ter_TermOfLoan" type="xbrli:positiveIntegerItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TestSystemsManufacturedInternallyMember" id="ter_TestSystemsManufacturedInternallyMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
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  <element name="TotalDeferredRevenueAndCustomerAdvances" id="ter_TotalDeferredRevenueAndCustomerAdvances" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TotalIncomeTaxProvisionBenefitFromContinuingOperationsAndDiscontinuedOperations" id="ter_TotalIncomeTaxProvisionBenefitFromContinuingOperationsAndDiscontinuedOperations" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
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  <element name="TradenamesAndTrademarksMember" id="ter_TradenamesAndTrademarksMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
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  <element name="TwentyZeroSixIncentiveCompensationPlanMember" id="ter_TwentyZeroSixIncentiveCompensationPlanMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="UnitedKingdomDefinedBenefitPensionPlanMember" id="ter_UnitedKingdomDefinedBenefitPensionPlanMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="UnitedKingdomGovernmentSecuritiesMember" id="ter_UnitedKingdomGovernmentSecuritiesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="UnitedStatesEquityLargeCapMember" id="ter_UnitedStatesEquityLargeCapMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
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  <element name="UnitedStatesPlansMember" id="ter_UnitedStatesPlansMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
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  <element name="UnitedStatesSupplementalExecutiveDefinedBenefitPensionPlanMember" id="ter_UnitedStatesSupplementalExecutiveDefinedBenefitPensionPlanMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
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  <element name="UnrecognizedTaxBenefitsIfRecognizedWouldImpactValuationAllowance" id="ter_UnrecognizedTaxBenefitsIfRecognizedWouldImpactValuationAllowance" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
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  <element name="ValueOfCommonStockIssuedToEmployeesPerShare" id="ter_ValueOfCommonStockIssuedToEmployeesPerShare" type="num:perShareItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="WarrantPrice" id="ter_WarrantPrice" type="num:perShareItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="WarrantsConversionPremiumPercentage" id="ter_WarrantsConversionPremiumPercentage" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="WarrantStrikePrice" id="ter_WarrantStrikePrice" type="num:perShareItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="WirelessTestMember" id="ter_WirelessTestMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
</schema>
