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Agilent Technologies U1251A manual Fuse checking procedure, Figure above

Models: U1251A

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Maintenance 5

Fuse checking procedure

It is recommended that you check the fuses of the multimeter before using it. Follow the instructions below to test the fuses inside the multimeter. Refer to Figure 5- 8 for the respective positions of Fuse 1 and Fuse 2.

1	Set the rotary switch to	.
2	Connect the red test lead to the input terminal		.

3To test Fuse 1, place the tip of the test probe on the right

half of input terminal

. Ensure that the probe tip

touches the metal inside the input terminal, as shown in the

figure above.

Agilent U1251A/U1252A User’s and Service Guide

105

Image 125

Agilent Technologies U1251A manual Fuse checking procedure, Figure above

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 Meter, and follow the correct polarity Never measure voltage when current measurement is selectedRegulatory Markings Affixed product label is as shown below Product CategoryThis Guide… Declaration of Conformity DoC Contents Overload alert Setting Percentage % Scale ReadoutAgilent Technologies calibration services Returning to Default Factory SettingsAdjustment is recommended Calibration intervalValid adjustment input values Adjustments ConsiderationAdjustment procedure Calibration errors161 III Xviii List of Figures Reset setup List of Tables 159 Introducing the U12521A/U1252A Handheld Digital Multimeter Getting StartedIntroducing the U12521A/U1252A Handheld Digital Multimeter Check the shipment IR-USB cable To PC host Tilt-stand at Adjusting the tilt-stand3Tilt-stand at hanging position Front panel at a glance Display Keypad Rotary switch Terminal ConnectorsIR communication port Tilt-stand Battery access coverRear panel at a glance Rotary switch at a glance Button 7U1252A keypad 2Keypad desciption and functionsSets to Auto Range mode Display at a glance LCD symbol Description 3General display symbols4Priamry display symbols KHz 5Secondary display symbolsRange Counts/segments Used for the function 6Analog bar range and counts2500 Diode Ω, nS Selecting display with the Hz button Duty cycle % Frequency Hz 7Selecting display with the Hz button Frequency HzHz Frequency counter press Frequency Hz Pulse width ms Duty cycle % Hz Frequency counter press Frequency Hz 1008Selecting display with the Dual button Selecting display with the Dual buttonBy pressing For U1251AAC a Selection display with the Shift button Rotary switch position Function Primary displayHz AC coupling 9Selecting display with the Shift buttonTemp 9Selecting display with the Shift button For U1252A DC mVTerminals at a glance Rotary switch position Input terminals Overload protectionUnderstanding The Measurement Instructions Making MeasurementsNo.Instructions Understanding The Measurement Instructions1Numerical steps descriptions Red Lead Black Lead Measuring AC voltage2Measuring DC voltage Measuring DC voltagePress If necessary to ensure Measuring CurrentΜA & mA measurement 3Measuring μA and mA current Black Lead Red Lead2Percentage scale and measurement range Percentage scale of 4 mA to 20 mAPress 4Measuring scale of 4-20 mA 5A ampere current measurement Ampere measurementFrequency Counter 6Measuring frequency Measuring Resistance, Conductance and Testing Continuity 8Audible continuity, conductance, and resistance test Audible continuityMeasurement range Beeper sound threshold 3Audible continuity measurement range9Conductance measurement Testing Diodes 10Measuring forward bias of diode 11Measuring reverse bias of diode Means the capacitor is charging Discharging Measuring Capacitance12Capacitance measurements Measuring Temperature 14Connecting the probe with adapter into the multimeter Making Measurements 15Surface temperature measurement Input warning Alerts and Warning During MeasurementOverload alert 17Charge terminal alert Charge terminal alertFunctions and Features Press to restart the dynamic recording Dynamic Recording1Dynamic recording mode operation Data Hold Trigger Hold 2Data hold mode operationRefresh Hold Press to return Null Relative 4Null relative mode operation Reference for other voltage measurements Decibel DisplayPress Pres s 5dBm/dBV display mode operationIf the reading is OL, press Ms Peak HoldTo re-start the peak-recording measurement If you need to re-start the peak recording, press61 ms peak hold mode operation Manual logging Data LoggingFull Log Are filled, Full is indicated on the secondary display Interval logging9Interval Automatic logging mode operation Reviewing logged data 10Log review mode operation Frequency Hz Square Wave Output for U1252A11Frequency adjustment for square wave output Press 13Duty cycle adjustment for Square Wave Connect To PC Remote CommunicationFeatures and Functions Setting Data Bit Changing The Default SettingSelecting Setup Mode Display Description 1Available setting options in Setup modeMenu Item Available setting options Swaps display to C 1Data hold/Refersh hold setup Setting Data Hold/Refresh Hold ModePress PressPress Setting Data Logging Mode3Thermocouple type setup Setting Thermocouple Types U1252A only4Reference impedance for dBm measurement setup Setting Reference Impedance for dBm Measurement5Minimum frequency setup Setting Minimum Frequency MeasurementSetting Temperature Unit 6Temperature unit setup Setting Auto Power Saving Mode 7Auto power saving setup % scale readout setup Setting Percentage % Scale Readout9Beep frequency setup Setting Beep Frequency10Backlit timer setup Setting Backlight Timer11Baud rate setup remote control Setting Baud Rate12Parity check setup Setting Parity Check13Data bit setup for remote control Setting Data Bit14Echo mode setup for remote control Setting Echo Mode15Print mode setup for remote control Setting Print ModePress Press Returning to Default Factory SettingsMaintenance 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 Condition Battery voltage Proportional percentage 2Battery capacity display as trickleError Error message 2Error messages4Charging mode Agilent U1251A/U1252A User’s and Service Guide 103 6Battery charging procedure Figure above Fuse checking procedure3Measurement readings for fuse checking Replacing the fuseFuse Agilent part number Rating Size Type 4Fuse specificationsFuse Malfunction Troubleshooting procedure Troubleshooting5Basic troubleshooting procedures To order replaceable parts 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 Calibration interval Adjustment is recommendedApplication Recommended equipment Recommended Test Equipment1Recommended Test Equipment Backlit test Testing the displayBasic Operating Test Current terminal test SetupCharge terminal alert test Test Considerations Calibration Security Doing the performance verification tests 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 ± 75 μV Agilent U1251A/U1252A User’s and Service Guide 12333250A Output ± 350 mWStep Test Function Range 5520A Output Use 34410A Square Wave Use 53131A OutputAgilent U1251A/U1252A User’s and Service Guide 127 To Unsecure the Instrument from the Front Panel Unsecuring the instrument for calibrationAgilent U1251A/U1252A User’s and Service Guide 129 Tory default code using the front panel Calibration process Selecting the Adjustment Mode Using the front panel for adjustmentsCalibration memory for the present function Adjustments ConsiderationProblem and repeat the procedure Function Range Valid Amplitude Input Values Valid adjustment input values3Valid adjustment input values Simultaneously to exit the adjustment mode Adjustment procedure136 Agilent U1251A/U1252A User’s and Service Guide Step Test Function Cal Range Input Cal Item U1251A U1252A 4Adjustment table138 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 Number Recommended Accuracy Requirements Calibration errors144 Agilent U1251A/U1252A User’s and Service Guide Frequency Counter Specifications for U1252A Frequency Sensitivity SpecificationsPower Supply Product CharacteristicsAgilent U1251A/U1252A User’s and Service Guide 147 Calibration Cycle Measurement category definition Measurement CategorySpecification Assumptions DC Specifications Electrical SpecificationsFunction Range Resolution Burden Voltage U1251A U1252A AccuracyMaximum open voltage + 4.2 Frequency Function Range Resolution AC SpecificationsFunction Range Resolution Function Range Resolution 45 Hz KHz 10 kHz 20 kHzFrequency 20 Hz 45 Hz KHz 10 kHz Frequency Hz 45 HzFrequency 30 Hz 45 Hz KHz 7U1252A true RMS ac+dc current specificationsFunction Range Resolution 45 Hz KHz 10 kHz Temperature Specifications Capacitance Specifications8Capacitance specifications 9Temperature specificationsDuty Cycle and Pulse Width Specifications Frequency Specifications10Frequency specifications 11Duty cycle and pulse width specificationsMinimum sensitivity RMS sine wave Frequency Sensitivity SpecificationsModel Number U1251A U1252A 100 kHzInput Range Peak Hold SpecificationsSignal Width Accuracy For DC mV/voltage/current 15Frequency counter divide by 1 specifications Frequency Counter Specifications for U1252A16Frequency counter divide by 100 4 specifications Sensitivity Min. Input FrequencyOutput Range Accuracy 17Square wave output specificationsSquare Wave Output for U1252A Display update rate approximate Operating Specifications18Display update rate approximate Realtime clock. Only ONE sample per second can be logged19Input Impedance Input impedance164 Agilent U1251A/U1252A User’s and Service Guide Contact us