Fuse checking procedure, Figure above | Agilent Technologies U1251A

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 selected Regulatory Markings Affixed product label is as shown below Product Category This Guide… Declaration of Conformity DoC Contents Overload alert Setting Percentage % Scale Readout Agilent Technologies calibration services Returning to Default Factory SettingsAdjustment is recommended Calibration interval Valid adjustment input values Adjustments ConsiderationAdjustment procedure Calibration errors 161 III Xviii List of Figures Reset setup List of Tables 159 Introducing the U12521A/U1252A Handheld Digital Multimeter Getting Started Introducing the U12521A/U1252A Handheld Digital Multimeter Check the shipment IR-USB cable To PC host Tilt-stand at Adjusting the tilt-stand 3Tilt-stand at hanging position Front panel at a glance Display Keypad Rotary switch Terminal Connectors IR communication port Tilt-stand Battery access coverRear panel at a glance Rotary switch at a glance Button 7U1252A keypad 2Keypad desciption and functions Sets to Auto Range mode Display at a glance LCD symbol Description 3General display symbols 4Priamry display symbols KHz 5Secondary display symbols Range 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 100 8Selecting display with the Dual button Selecting display with the Dual buttonBy pressing For U1251A AC a Selection display with the Shift button Rotary switch position Function Primary displayHz AC coupling 9Selecting display with the Shift button Temp 9Selecting display with the Shift button For U1252A DC mV Terminals at a glance Rotary switch position Input terminals Overload protection Understanding The Measurement Instructions Making Measurements No.Instructions Understanding The Measurement Instructions1Numerical steps descriptions Red Lead Black Lead Measuring AC voltage 2Measuring DC voltage Measuring DC voltage Press If necessary to ensure Measuring CurrentΜA & mA measurement 3Measuring μA and mA current Black Lead Red Lead 2Percentage scale and measurement range Percentage scale of 4 mA to 20 mAPress 4Measuring scale of 4-20 mA 5A ampere current measurement Ampere measurement Frequency Counter 6Measuring frequency Measuring Resistance, Conductance and Testing Continuity 8Audible continuity, conductance, and resistance test Audible continuity Measurement range Beeper sound threshold 3Audible continuity measurement range 9Conductance measurement Testing Diodes 10Measuring forward bias of diode 11Measuring reverse bias of diode Means the capacitor is charging Discharging Measuring Capacitance 12Capacitance 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 alert Functions and Features Press to restart the dynamic recording Dynamic Recording 1Dynamic recording mode operation Data Hold Trigger Hold 2Data hold mode operation Refresh Hold Press to return Null Relative 4Null relative mode operation Reference for other voltage measurements Decibel Display Press Pres s 5dBm/dBV display mode operation If the reading is OL, press Ms Peak HoldTo re-start the peak-recording measurement If you need to re-start the peak recording, press 61 ms peak hold mode operation Manual logging Data Logging Full Log Are filled, Full is indicated on the secondary display Interval logging 9Interval Automatic logging mode operation Reviewing logged data 10Log review mode operation Frequency Hz Square Wave Output for U1252A 11Frequency adjustment for square wave output Press 13Duty cycle adjustment for Square Wave Connect To PC Remote Communication Features and Functions Setting Data Bit Changing The Default Setting Selecting 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 Mode Press PressPress Setting Data Logging Mode 3Thermocouple type setup Setting Thermocouple Types U1252A only 4Reference impedance for dBm measurement setup Setting Reference Impedance for dBm Measurement 5Minimum frequency setup Setting Minimum Frequency Measurement Setting Temperature Unit 6Temperature unit setup Setting Auto Power Saving Mode 7Auto power saving setup % scale readout setup Setting Percentage % Scale Readout 9Beep frequency setup Setting Beep Frequency 10Backlit timer setup Setting Backlight Timer 11Baud rate setup remote control Setting Baud Rate 12Parity check setup Setting Parity Check 13Data bit setup for remote control Setting Data Bit 14Echo mode setup for remote control Setting Echo Mode 15Print mode setup for remote control Setting Print Mode Press Press Returning to Default Factory Settings Maintenance 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 trickle Error Error message 2Error messages 4Charging mode Agilent U1251A/U1252A User’s and Service Guide 103 6Battery charging procedure Figure above Fuse checking procedure 3Measurement readings for fuse checking Replacing the fuse Fuse Agilent part number Rating Size Type 4Fuse specificationsFuse Malfunction Troubleshooting procedure Troubleshooting5Basic troubleshooting procedures To order replaceable parts Replaceable Parts 110 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 recommended Application Recommended equipment Recommended Test Equipment1Recommended Test Equipment Backlit test Testing the displayBasic Operating Test Current terminal test Setup Charge terminal alert test Test Considerations Calibration Security Doing the performance verification tests Performance Verification Tests Step 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 123 33250A Output ± 350 mW Step Test Function Range 5520A Output Use 34410A Square Wave Use 53131A Output Agilent U1251A/U1252A User’s and Service Guide 127 To Unsecure the Instrument from the Front Panel Unsecuring the instrument for calibration Agilent 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 adjustments Calibration 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 procedure 136 Agilent U1251A/U1252A User’s and Service Guide Step Test Function Cal Range Input Cal Item U1251A U1252A 4Adjustment table 138 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 errors 144 Agilent U1251A/U1252A User’s and Service Guide Frequency Counter Specifications for U1252A Frequency Sensitivity Specifications Power Supply Product Characteristics Agilent U1251A/U1252A User’s and Service Guide 147 Calibration Cycle Measurement category definition Measurement Category Specification Assumptions DC Specifications Electrical SpecificationsFunction Range Resolution Burden Voltage U1251A U1252A Accuracy Maximum open voltage + 4.2 Frequency Function Range Resolution AC Specifications Function Range Resolution Function Range Resolution 45 Hz KHz 10 kHz 20 kHzFrequency 20 Hz 45 Hz KHz 10 kHz Frequency Hz 45 Hz Frequency 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 specifications Duty Cycle and Pulse Width Specifications Frequency Specifications10Frequency specifications 11Duty cycle and pulse width specifications Minimum sensitivity RMS sine wave Frequency Sensitivity SpecificationsModel Number U1251A U1252A 100 kHz Input 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 Frequency Output 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 logged 19Input Impedance Input impedance 164 Agilent U1251A/U1252A User’s and Service Guide Contact us