Input impedance, 19Input Impedance | Agilent Technologies U1251A

		Specifications 8
Input impedance
Table 7-19Input Impedance

Function	Range	Input Impedance

	50.000 mV	10.00 MΩ

	500.00 mV	10.00 MΩ

	1000.0 mV	10.00 MΩ
DC Voltage [1]
DC Voltage [1]	5.0000 V	11.10 MΩ
	50.000 V	10.10 MΩ

	500.00 V	10.01 MΩ

	1000.0 V	10.001 MΩ

	50.000 mV	10.00 MΩ

	500.00 mV	10.00 MΩ

	1000.0 mV	10.00 MΩ
AC Voltage [2]
AC Voltage [2]	5.0000 V	10.00 MΩ
	50.000 V	10.00 MΩ

	500.00 V	10.00 MΩ

	1000.0 V	10.00 MΩ

	50.000 mV	10.00 MΩ

	500.00 mV	10.00 MΩ

	1000.0 mV	10.00 MΩ
AC + DC Voltage [2]
AC + DC Voltage [2]	5.0000 V	11.10 MΩ // 10 MΩ
	50.000 V	10.10 MΩ // 10 MΩ

	500.00 V	10.01 MΩ // 10 MΩ

	1000.0 V	10.001 MΩ // 10 MΩ

Notes for input impedance:

1For 5 V to 1000 V range, the specified input impedance in parallel with 10 MΩ at dual display.

2The specified input impedance (nominal) in parallel with <100 pF.

Agilent U1251A/U1252A User’s and Service Guide

163

Image 183

Agilent Technologies U1251A manual Input impedance, 19Input Impedance

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 Calibration interval Returning to Default Factory SettingsAgilent Technologies calibration services Adjustment is recommended Calibration errors Adjustments ConsiderationValid adjustment input values Adjustment procedure 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 Tilt-stand Battery access cover Rear panel at a glanceIR communication port 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 6Analog bar range and counts 2500 Diode Ω, nSRange Counts/segments Used for the function Selecting display with the Hz button Duty cycle % Hz Frequency counter press Frequency Hz 100 7Selecting display with the Hz button Frequency HzDuty cycle % Frequency Hz Hz Frequency counter press Frequency Hz Pulse width ms For U1251A Selecting display with the Dual button8Selecting display with the Dual button By pressing AC a 9Selecting display with the Shift button Rotary switch position Function Primary displaySelection display with the Shift button Hz AC coupling 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 Understanding The Measurement Instructions 1Numerical steps descriptionsNo.Instructions Red Lead Black Lead Measuring AC voltage 2Measuring DC voltage Measuring DC voltage Measuring Current ΜA & mA measurementPress If necessary to ensure 3Measuring μA and mA current Black Lead Red Lead Percentage scale of 4 mA to 20 mA Press2Percentage scale and measurement range 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 Alerts and Warning During Measurement Overload alertInput warning 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 you need to re-start the peak recording, press Ms Peak HoldIf the reading is OL, press To re-start the peak-recording measurement 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 1Available setting options in Setup mode Menu Item Available setting optionsDisplay Description 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 General maintenance Battery replacementIntroduction List of compatible batteries for the Agilent U1251A List of of compatible batteries for the Agilent U1252ANominal voltage Charging the battery Storage considerationsMultimeter is to be unused for long periods of time 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 4Fuse specifications FuseFuse Agilent part number Rating Size Type Troubleshooting 5Basic troubleshooting proceduresMalfunction Troubleshooting procedure To order replaceable parts Replaceable Parts 110 Agilent U1251A/U1252A User’s and Service Guide Closed- case electronic calibration Backlit testCurrent terminal test Agilent Technologies calibration services Calibration OverviewClosed-case electronic calibration Calibration interval Adjustment is recommended Recommended Test Equipment 1Recommended Test EquipmentApplication Recommended equipment Testing the display Basic Operating TestBacklit test Current terminal test Setup Charge terminal alert test Test Considerations Calibration Security Doing the performance verification tests Performance Verification Tests Error from nominal 1 year 2Performance verification test stepsStep Test Function Range 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 Adjustments Consideration Problem and repeat the procedureCalibration memory for the present function Valid adjustment input values 3Valid adjustment input valuesFunction Range Valid Amplitude 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 Finishing the adjustment To read the calibration countYour instrument was calibrated before it left the factory 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 Accuracy Electrical SpecificationsDC Specifications Function Range Resolution Burden Voltage U1251A U1252A Maximum open voltage + 4.2 Frequency Function Range Resolution AC Specifications Frequency Hz 45 Hz Function Range Resolution 45 Hz KHz 10 kHz 20 kHzFunction Range Resolution Frequency 20 Hz 45 Hz KHz 10 kHz 7U1252A true RMS ac+dc current specifications Function Range Resolution 45 Hz KHz 10 kHzFrequency 30 Hz 45 Hz KHz 9Temperature specifications Capacitance SpecificationsTemperature Specifications 8Capacitance specifications 11Duty cycle and pulse width specifications Frequency SpecificationsDuty Cycle and Pulse Width Specifications 10Frequency specifications 100 kHz Frequency Sensitivity SpecificationsMinimum sensitivity RMS sine wave Model Number U1251A U1252A Peak Hold Specifications Signal Width Accuracy For DC mV/voltage/currentInput Range Sensitivity Min. Input Frequency Frequency Counter Specifications for U1252A15Frequency counter divide by 1 specifications 16Frequency counter divide by 100 4 specifications 17Square wave output specifications Square Wave Output for U1252AOutput Range Accuracy Realtime clock. Only ONE sample per second can be logged Operating SpecificationsDisplay update rate approximate 18Display update rate approximate 19Input Impedance Input impedance 164 Agilent U1251A/U1252A User’s and Service Guide Contact us