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U1251A
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13Duty cycle adjustment for Square Wave
Models:
U1251A
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Troubleshooting
Specification
Product Characteristics
Error codes
Changing The Default Setting
Setting Backlight Timer
Safety Symbols
Maintenance
Reset setup
Battery replacement
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3 Features and Functions
Figure
3-13
Duty cycle adjustment for Square Wave
70
Agilent U1251A/U1252A User’s and Service Guide
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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
Adjustment is recommended
Returning to Default Factory Settings
Agilent Technologies calibration services
Calibration interval
Adjustment procedure
Adjustments Consideration
Valid adjustment input values
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
Tilt-stand Battery access cover
Rear panel at a glance
IR 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
6Analog bar range and counts
2500 Diode Ω, nS
Range Counts/segments Used for the function
Selecting display with the Hz button
Hz Frequency counter press Frequency Hz Pulse width ms
7Selecting display with the Hz button Frequency Hz
Duty cycle % Frequency Hz
Duty cycle % Hz Frequency counter press Frequency Hz 100
By pressing
Selecting display with the Dual button
8Selecting display with the Dual button
For U1251A
AC a
Hz AC coupling
Rotary switch position Function Primary display
Selection display with the Shift button
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
Understanding The Measurement Instructions
1Numerical steps descriptions
No.Instructions
Measuring AC voltage
Red Lead Black Lead
Measuring DC voltage
2Measuring DC voltage
Measuring Current
ΜA & mA measurement
Press If necessary to ensure
Black Lead Red Lead
3Measuring μA and mA current
Percentage scale of 4 mA to 20 mA
Press
2Percentage 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
Alerts and Warning During Measurement
Overload alert
Input 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
To re-start the peak-recording measurement
Ms Peak Hold
If the reading is OL, press
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
1Available setting options in Setup mode
Menu Item Available setting options
Display 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
General maintenance
Battery replacement
Introduction
List of compatible batteries for the Agilent U1251A
List of of compatible batteries for the Agilent U1252A
Nominal voltage
Charging the battery
Storage considerations
Multimeter 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
4Fuse specifications
Fuse
Fuse Agilent part number Rating Size Type
Troubleshooting
5Basic troubleshooting procedures
Malfunction Troubleshooting procedure
Replaceable Parts
To order replaceable parts
110 Agilent U1251A/U1252A User’s and Service Guide
Closed- case electronic calibration
Backlit test
Current terminal test
Agilent Technologies calibration services
Calibration Overview
Closed-case electronic calibration
Adjustment is recommended
Calibration interval
Recommended Test Equipment
1Recommended Test Equipment
Application Recommended equipment
Testing the display
Basic Operating Test
Backlit test
Setup
Current terminal test
Charge terminal alert test
Test Considerations
Calibration Security
Performance Verification Tests
Doing the performance verification tests
Error from nominal 1 year
2Performance verification test steps
Step 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
Adjustments Consideration
Problem and repeat the procedure
Calibration memory for the present function
Valid adjustment input values
3Valid adjustment input values
Function 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
Finishing the adjustment
To read the calibration count
Your 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
Function Range Resolution Burden Voltage U1251A U1252A
Electrical Specifications
DC Specifications
Accuracy
Maximum open voltage + 4.2
AC Specifications
Frequency Function Range Resolution
Frequency 20 Hz 45 Hz KHz 10 kHz
Function Range Resolution 45 Hz KHz 10 kHz 20 kHz
Function Range Resolution
Frequency Hz 45 Hz
7U1252A true RMS ac+dc current specifications
Function Range Resolution 45 Hz KHz 10 kHz
Frequency 30 Hz 45 Hz KHz
8Capacitance specifications
Capacitance Specifications
Temperature Specifications
9Temperature specifications
10Frequency specifications
Frequency Specifications
Duty Cycle and Pulse Width Specifications
11Duty cycle and pulse width specifications
Model Number U1251A U1252A
Frequency Sensitivity Specifications
Minimum sensitivity RMS sine wave
100 kHz
Peak Hold Specifications
Signal Width Accuracy For DC mV/voltage/current
Input Range
16Frequency counter divide by 100 4 specifications
Frequency Counter Specifications for U1252A
15Frequency counter divide by 1 specifications
Sensitivity Min. Input Frequency
17Square wave output specifications
Square Wave Output for U1252A
Output Range Accuracy
18Display update rate approximate
Operating Specifications
Display 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
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