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Agilent Technologies U1251A manual Press to return

Models: U1251A

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3 Features and Functions

N O T E

Press

Variation counts > setting

The HOLD sign flashes until the measured value is stable and updated

Measurement is updated

Press to return

Figure 3-3Refresh hold mode operation

•For voltage and current measurements, the holding value will not be updated if the reading is below 500 counts.

•For resistance and diode measurements, the holding value will not be updated if the reading is in “OL” (open state).

•The holding value may not be updated when the reading does not reach a stable state for all measurements.

54	Agilent U1251A/U1252A User’s and Service Guide

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Agilent Technologies U1251A manual Press to return

Contents

Agilent U1251A U1252A Handheld Digital Multimeter U T I O N WA R N I N G Safety Symbols Safety Information WA R N I N G Never measure voltage when current measurement is selected Meter, and follow the correct polarityRegulatory Markings Product Category Affixed product label is as shown belowThis Guide… Declaration of Conformity DoC Contents Setting Percentage % Scale Readout Overload alertAdjustment is recommended Returning to Default Factory SettingsAgilent Technologies calibration services Calibration intervalAdjustment procedure Adjustments ConsiderationValid adjustment input values Calibration errors161 III Xviii List of Figures Reset setup List of Tables 159 Getting Started Introducing the U12521A/U1252A Handheld Digital MultimeterIntroducing the U12521A/U1252A Handheld Digital Multimeter Check the shipment Adjusting the tilt-stand IR-USB cable To PC host Tilt-stand at3Tilt-stand at hanging position Display Keypad Rotary switch Terminal Connectors Front panel at a glanceIR communication port Tilt-stand Battery access coverRear panel at a glance Rotary switch at a glance 7U1252A keypad 2Keypad desciption and functions ButtonSets to Auto Range mode Display at a glance 3General display symbols LCD symbol Description4Priamry display symbols 5Secondary display symbols KHzRange Counts/segments Used for the function 6Analog bar range and counts2500 Diode Ω, nS Selecting display with the Hz button Hz Frequency counter press Frequency Hz Pulse width ms 7Selecting display with the Hz button Frequency HzDuty cycle % Frequency Hz Duty cycle % Hz Frequency counter press Frequency Hz 100By pressing Selecting display with the Dual button8Selecting display with the Dual button For U1251AAC a Hz AC coupling Rotary switch position Function Primary displaySelection display with the Shift button 9Selecting display with the Shift button9Selecting display with the Shift button For U1252A DC mV TempRotary switch position Input terminals Overload protection Terminals at a glanceMaking Measurements Understanding The Measurement InstructionsNo.Instructions Understanding The Measurement Instructions1Numerical steps descriptions Measuring AC voltage Red Lead Black LeadMeasuring DC voltage 2Measuring DC voltagePress If necessary to ensure Measuring CurrentΜA & mA measurement Black Lead Red Lead 3Measuring μA and mA current2Percentage scale and measurement range Percentage scale of 4 mA to 20 mAPress 4Measuring scale of 4-20 mA Ampere measurement 5A ampere current measurementFrequency Counter 6Measuring frequency Measuring Resistance, Conductance and Testing Continuity Audible continuity 8Audible continuity, conductance, and resistance test3Audible continuity measurement range Measurement range Beeper sound threshold9Conductance measurement Testing Diodes 10Measuring forward bias of diode 11Measuring reverse bias of diode Measuring Capacitance Means the capacitor is charging Discharging12Capacitance measurements Measuring Temperature 14Connecting the probe with adapter into the multimeter Making Measurements 15Surface temperature measurement Input warning Alerts and Warning During MeasurementOverload alert Charge terminal alert 17Charge terminal alertFunctions and Features Dynamic Recording Press to restart the dynamic recording1Dynamic recording mode operation 2Data hold mode operation Data Hold Trigger HoldRefresh Hold Press to return Null Relative 4Null relative mode operation Decibel Display Reference for other voltage measurements5dBm/dBV display mode operation Press Pres sTo re-start the peak-recording measurement Ms Peak HoldIf the reading is OL, press If you need to re-start the peak recording, press61 ms peak hold mode operation Data Logging Manual loggingFull Log Interval logging Are filled, Full is indicated on the secondary display9Interval Automatic logging mode operation Reviewing logged data 10Log review mode operation Square Wave Output for U1252A Frequency Hz11Frequency adjustment for square wave output Press 13Duty cycle adjustment for Square Wave Remote Communication Connect To PCFeatures and Functions Changing The Default Setting Setting Data BitSelecting Setup Mode Display Description 1Available setting options in Setup modeMenu Item Available setting options Swaps display to C Setting Data Hold/Refresh Hold Mode 1Data hold/Refersh hold setupSetting Data Logging Mode Press PressPressSetting Thermocouple Types U1252A only 3Thermocouple type setupSetting Reference Impedance for dBm Measurement 4Reference impedance for dBm measurement setupSetting Minimum Frequency Measurement 5Minimum frequency setupSetting Temperature Unit 6Temperature unit setup Setting Auto Power Saving Mode 7Auto power saving setup Setting Percentage % Scale Readout % scale readout setupSetting Beep Frequency 9Beep frequency setupSetting Backlight Timer 10Backlit timer setupSetting Baud Rate 11Baud rate setup remote controlSetting Parity Check 12Parity check setupSetting Data Bit 13Data bit setup for remote controlSetting Echo Mode 14Echo mode setup for remote controlSetting Print Mode 15Print mode setup for remote controlReturning to Default Factory Settings Press PressMaintenance Introduction General maintenanceBattery replacement Nominal voltage List of compatible batteries for the Agilent U1251AList of of compatible batteries for the Agilent U1252A Multimeter is to be unused for long periods of time Charging the batteryStorage considerations U T I O N 2Battery capacity display as trickle Condition Battery voltage Proportional percentage2Error messages Error Error message4Charging mode Agilent U1251A/U1252A User’s and Service Guide 103 6Battery charging procedure Fuse checking procedure Figure aboveReplacing the fuse 3Measurement readings for fuse checkingFuse Agilent part number Rating Size Type 4Fuse specificationsFuse Malfunction Troubleshooting procedure Troubleshooting5Basic troubleshooting procedures Replaceable Parts To order replaceable parts110 Agilent U1251A/U1252A User’s and Service Guide Current terminal test Closed- case electronic calibrationBacklit test Closed-case electronic calibration Agilent Technologies calibration servicesCalibration Overview Adjustment is recommended Calibration intervalApplication Recommended equipment Recommended Test Equipment1Recommended Test Equipment Backlit test Testing the displayBasic Operating Test Setup Current terminal testCharge terminal alert test Test Considerations Calibration Security Performance Verification Tests Doing the performance verification testsStep Test Function Range Error from nominal 1 year2Performance verification test steps U1251A ± 20 mV ± 17.5 mV 500 ± 200 mV 1000 ± 800 mV Agilent U1251A/U1252A User’s and Service Guide 123 ± 75 μV± 350 mW 33250A OutputStep Test Function Range 5520A Output Square Wave Use 53131A Output Use 34410AAgilent U1251A/U1252A User’s and Service Guide 127 Unsecuring the instrument for calibration To Unsecure the Instrument from the Front PanelAgilent U1251A/U1252A User’s and Service Guide 129 Tory default code using the front panel Calibration process Using the front panel for adjustments Selecting the Adjustment ModeCalibration memory for the present function Adjustments ConsiderationProblem and repeat the procedure Function Range Valid Amplitude Input Values Valid adjustment input values3Valid adjustment input values Adjustment procedure Simultaneously to exit the adjustment mode136 Agilent U1251A/U1252A User’s and Service Guide 4Adjustment table Step Test Function Cal Range Input Cal Item U1251A U1252A138 Agilent U1251A/U1252A User’s and Service Guide Agilent U1251A/U1252A User’s and Service Guide 139 Open Agilent U1251A/U1252A User’s and Service Guide 141 Your instrument was calibrated before it left the factory Finishing the adjustmentTo read the calibration count Calibration errors Number Recommended Accuracy Requirements144 Agilent U1251A/U1252A User’s and Service Guide Frequency Sensitivity Specifications Frequency Counter Specifications for U1252AProduct Characteristics Power SupplyAgilent U1251A/U1252A User’s and Service Guide 147 Calibration Cycle Measurement Category Measurement category definitionSpecification Assumptions Function Range Resolution Burden Voltage U1251A U1252A Electrical SpecificationsDC Specifications AccuracyMaximum open voltage + 4.2 AC Specifications Frequency Function Range ResolutionFrequency 20 Hz 45 Hz KHz 10 kHz Function Range Resolution 45 Hz KHz 10 kHz 20 kHzFunction Range Resolution Frequency Hz 45 HzFrequency 30 Hz 45 Hz KHz 7U1252A true RMS ac+dc current specificationsFunction Range Resolution 45 Hz KHz 10 kHz 8Capacitance specifications Capacitance SpecificationsTemperature Specifications 9Temperature specifications10Frequency specifications Frequency SpecificationsDuty Cycle and Pulse Width Specifications 11Duty cycle and pulse width specificationsModel Number U1251A U1252A Frequency Sensitivity SpecificationsMinimum sensitivity RMS sine wave 100 kHzInput Range Peak Hold SpecificationsSignal Width Accuracy For DC mV/voltage/current 16Frequency counter divide by 100 4 specifications Frequency Counter Specifications for U1252A15Frequency counter divide by 1 specifications Sensitivity Min. Input FrequencyOutput Range Accuracy 17Square wave output specificationsSquare Wave Output for U1252A 18Display update rate approximate Operating SpecificationsDisplay update rate approximate Realtime clock. Only ONE sample per second can be loggedInput impedance 19Input Impedance164 Agilent U1251A/U1252A User’s and Service Guide Contact us