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Agilent Technologies U1251A manual Maximum open voltage + 4.2

Models: U1251A

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8 Specifications

Table 7-1DC Accuracy ± (% of reading + Number of Least Significant Digit) (continued)

				Test Current/		Accuracy
	Function	Range	Resolution	Burden Voltage	U1251A	U1252A
		500.00 µA	0.01 µA	0.06 V	0.1 + 5 [6]	0.05 + 5 [6]
		5000.0 µA	0.1 µA	0.6 V	0.1 + 5 [6]	0.05 + 5 [6]
	Current	50.000 mA	0.001 mA	0.09 V	0.2 + 5 [6]	0.15 + 5 [6]
	Current	440.00 mA	0.01 mA	0.9 V	0.2 + 5 [6]	0.15 + 5 [6]
		440.00 mA	0.01 mA	0.9 V	0.2 + 5 [6]	0.15 + 5 [6]
		5.0000 A	0.0001 A	0.2 V	0.3 + 10	0.3 + 10
		10.000 A [7]	0.001 A	0.4 V	0.3 + 10	0.3 + 5

Notes for current specifications:

6Always use the Null function to zero out thermal effect with open test lead before measuring the signal. If the Null function is not used, add 20 counts to the specified accuracy. Thermal effect could occur due to the following:

•Wrong operation – where the resistance, diode or mV measurement function is used to measure high voltage signals within the range of 50 V to 1000V

•After battery-charging is complete.

•After measuring a current greater than 440 mA. Thus we recommend that the meter be left to cool down for twice the length of measurement time used.

7Current can be measured up to 10 A continuously. An additional 0.5 % needs to be added to the specified accuracy if the signal measured is in the range of 10 A to 20 A 30 seconds maximum. After measuring current > 10 A, leave the meter to cool down (in switched OFF state) for twice the length of measuring time used before application of low current measurement.

			Test Current/		Accuracy
Function	Range	Resolution	Burden Voltage	U1251A	U1252A
Diode [8]	-	0.1 mV	1.04 mA		0.05 + 5

Notes for diode specifications:

8Maximum open voltage: < + 4.2 V.

152	Agilent U1251A/U1252A User’s and Service Guide

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Agilent Technologies U1251A manual Maximum open voltage + 4.2

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 polarity Regulatory Markings Product Category Affixed product label is as shown below This Guide… Declaration of Conformity DoC Contents Setting Percentage % Scale Readout Overload alert Returning to Default Factory Settings Agilent Technologies calibration servicesAdjustment is recommended Calibration interval Adjustments Consideration Valid adjustment input valuesAdjustment procedure Calibration errors 161 III Xviii List of Figures Reset setup List of Tables 159 Getting Started Introducing the U12521A/U1252A Handheld Digital Multimeter Introducing the U12521A/U1252A Handheld Digital Multimeter Check the shipment Adjusting the tilt-stand IR-USB cable To PC host Tilt-stand at 3Tilt-stand at hanging position Display Keypad Rotary switch Terminal Connectors Front panel at a glance Rear panel at a glance Tilt-stand Battery access coverIR communication port Rotary switch at a glance 7U1252A keypad 2Keypad desciption and functions Button Sets to Auto Range mode Display at a glance 3General display symbols LCD symbol Description 4Priamry display symbols 5Secondary display symbols KHz 2500 Diode Ω, nS 6Analog bar range and countsRange Counts/segments Used for the function Selecting display with the Hz button 7Selecting display with the Hz button Frequency Hz Duty cycle % Frequency HzHz Frequency counter press Frequency Hz Pulse width ms Duty cycle % Hz Frequency counter press Frequency Hz 100 Selecting display with the Dual button 8Selecting display with the Dual buttonBy pressing For U1251A AC a Rotary switch position Function Primary display Selection display with the Shift buttonHz AC coupling 9Selecting display with the Shift button 9Selecting display with the Shift button For U1252A DC mV Temp Rotary switch position Input terminals Overload protection Terminals at a glance Making Measurements Understanding The Measurement Instructions 1Numerical steps descriptions Understanding The Measurement InstructionsNo.Instructions Measuring AC voltage Red Lead Black Lead Measuring DC voltage 2Measuring DC voltage ΜA & mA measurement Measuring CurrentPress If necessary to ensure Black Lead Red Lead 3Measuring μA and mA current Press Percentage scale of 4 mA to 20 mA2Percentage scale and measurement range 4Measuring scale of 4-20 mA Ampere measurement 5A ampere current measurement Frequency Counter 6Measuring frequency Measuring Resistance, Conductance and Testing Continuity Audible continuity 8Audible continuity, conductance, and resistance test 3Audible continuity measurement range Measurement range Beeper sound threshold 9Conductance measurement Testing Diodes 10Measuring forward bias of diode 11Measuring reverse bias of diode Measuring Capacitance Means the capacitor is charging Discharging 12Capacitance measurements Measuring Temperature 14Connecting the probe with adapter into the multimeter Making Measurements 15Surface temperature measurement Overload alert Alerts and Warning During MeasurementInput warning Charge terminal alert 17Charge terminal alert Functions and Features Dynamic Recording Press to restart the dynamic recording 1Dynamic recording mode operation 2Data hold mode operation Data Hold Trigger Hold Refresh Hold Press to return Null Relative 4Null relative mode operation Decibel Display Reference for other voltage measurements 5dBm/dBV display mode operation Press Pres s Ms Peak Hold If the reading is OL, pressTo re-start the peak-recording measurement If you need to re-start the peak recording, press 61 ms peak hold mode operation Data Logging Manual logging Full Log Interval logging Are filled, Full is indicated on the secondary display 9Interval Automatic logging mode operation Reviewing logged data 10Log review mode operation Square Wave Output for U1252A Frequency Hz 11Frequency adjustment for square wave output Press 13Duty cycle adjustment for Square Wave Remote Communication Connect To PC Features and Functions Changing The Default Setting Setting Data Bit Selecting Setup Mode Menu Item Available setting options 1Available setting options in Setup modeDisplay Description Swaps display to C Setting Data Hold/Refresh Hold Mode 1Data hold/Refersh hold setup Setting Data Logging Mode Press PressPress Setting Thermocouple Types U1252A only 3Thermocouple type setup Setting Reference Impedance for dBm Measurement 4Reference impedance for dBm measurement setup Setting Minimum Frequency Measurement 5Minimum frequency setup Setting Temperature Unit 6Temperature unit setup Setting Auto Power Saving Mode 7Auto power saving setup Setting Percentage % Scale Readout % scale readout setup Setting Beep Frequency 9Beep frequency setup Setting Backlight Timer 10Backlit timer setup Setting Baud Rate 11Baud rate setup remote control Setting Parity Check 12Parity check setup Setting Data Bit 13Data bit setup for remote control Setting Echo Mode 14Echo mode setup for remote control Setting Print Mode 15Print mode setup for remote control Returning to Default Factory Settings Press Press Maintenance Battery replacement General maintenanceIntroduction List of of compatible batteries for the Agilent U1252A List of compatible batteries for the Agilent U1251ANominal voltage Storage considerations Charging the batteryMultimeter is to be unused for long periods of time U T I O N 2Battery capacity display as trickle Condition Battery voltage Proportional percentage 2Error messages Error Error message 4Charging mode Agilent U1251A/U1252A User’s and Service Guide 103 6Battery charging procedure Fuse checking procedure Figure above Replacing the fuse 3Measurement readings for fuse checking Fuse 4Fuse specificationsFuse Agilent part number Rating Size Type 5Basic troubleshooting procedures TroubleshootingMalfunction Troubleshooting procedure Replaceable Parts To order replaceable parts 110 Agilent U1251A/U1252A User’s and Service Guide Backlit test Closed- case electronic calibrationCurrent terminal test Calibration Overview Agilent Technologies calibration servicesClosed-case electronic calibration Adjustment is recommended Calibration interval 1Recommended Test Equipment Recommended Test EquipmentApplication Recommended equipment Basic Operating Test Testing the displayBacklit test Setup Current terminal test Charge terminal alert test Test Considerations Calibration Security Performance Verification Tests Doing the performance verification tests 2Performance verification test steps Error from nominal 1 yearStep Test Function Range 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 Output Step Test Function Range 5520A Output Square Wave Use 53131A Output Use 34410A Agilent U1251A/U1252A User’s and Service Guide 127 Unsecuring the instrument for calibration To Unsecure the Instrument from the Front Panel Agilent 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 Mode Problem and repeat the procedure Adjustments ConsiderationCalibration memory for the present function 3Valid adjustment input values Valid adjustment input valuesFunction Range Valid Amplitude Input Values Adjustment procedure Simultaneously to exit the adjustment mode 136 Agilent U1251A/U1252A User’s and Service Guide 4Adjustment table Step Test Function Cal Range Input Cal Item U1251A U1252A 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 To read the calibration count Finishing the adjustmentYour instrument was calibrated before it left the factory Calibration errors Number Recommended Accuracy Requirements 144 Agilent U1251A/U1252A User’s and Service Guide Frequency Sensitivity Specifications Frequency Counter Specifications for U1252A Product Characteristics Power Supply Agilent U1251A/U1252A User’s and Service Guide 147 Calibration Cycle Measurement Category Measurement category definition Specification Assumptions Electrical Specifications DC SpecificationsFunction Range Resolution Burden Voltage U1251A U1252A Accuracy Maximum open voltage + 4.2 AC Specifications Frequency Function Range Resolution Function Range Resolution 45 Hz KHz 10 kHz 20 kHz Function Range ResolutionFrequency 20 Hz 45 Hz KHz 10 kHz Frequency Hz 45 Hz Function Range Resolution 45 Hz KHz 10 kHz 7U1252A true RMS ac+dc current specificationsFrequency 30 Hz 45 Hz KHz Capacitance Specifications Temperature Specifications8Capacitance specifications 9Temperature specifications Frequency Specifications Duty Cycle and Pulse Width Specifications10Frequency specifications 11Duty cycle and pulse width specifications Frequency Sensitivity Specifications Minimum sensitivity RMS sine waveModel Number U1251A U1252A 100 kHz Signal Width Accuracy For DC mV/voltage/current Peak Hold SpecificationsInput Range Frequency Counter Specifications for U1252A 15Frequency counter divide by 1 specifications16Frequency counter divide by 100 4 specifications Sensitivity Min. Input Frequency Square Wave Output for U1252A 17Square wave output specificationsOutput Range Accuracy Operating Specifications Display update rate approximate18Display update rate approximate Realtime clock. Only ONE sample per second can be logged Input impedance 19Input Impedance 164 Agilent U1251A/U1252A User’s and Service Guide Contact us