Agilent Technologies U1251A User's Manual And Service Manual
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Agilent Technologies U1251A User's Manual And Service Manual

Handheld digital multimeter
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Summary of Contents for Agilent Technologies U1251A

  • Page 1 Agilent U1251A and U1252A Handheld Digital Multimeter User’s and Service Guide Agilent Technologies...
  • Page 2 Notices Warranty Safety Notices © Agilent Technologies, Inc. 2006–2013 No part of this manual may be reproduced in The material contained in this docu- any form or by any means (including elec- ment is provided “as is,” and is sub-...

  • Page 3: Safety Symbols

    Safety Symbols The following symbols on the instrument and in the documentation indicate precautions which must be taken to maintain safe operation of the instrument. CAT IV CAT III Category III 1000 V overvoltage protection Category IV 600 V overvoltage protection 600 V 1000 V Equipment protected throughout by...

  • Page 4: Safety Information

    Failure to comply with these precautions or with specific warnings elsewhere in this manual violates safety standards of design, manufacture, and intended use of the instrument. Agilent Technologies assumes no liability for the customer’s failure to comply with these requirements.
  • Page 5 Remove power and do not use the product until safe operation can be verified by service-trained personnel. If necessary, return the product to Agilent Technologies Sales and Service Office for service and repair to ensure the safety features are maintained.
  • Page 6 • Turn off the circuit power and discharge all high-voltage capacitors in the circuit before C A U T I O N you perform resistance, continuity, diodes, or capacitance tests. • Use the correct terminals, function, and range for your measurements. •...
  • Page 7 Regulatory Markings The C-tick mark is a registered The CE mark is a registered trademark trademark of the Spectrum of the European Community. This CE Management Agency of Australia. This mark shows that the product complies signifies compliance with with all the relevant European Legal the Australia EMC Framework Directives.
  • Page 8 Technologies, or visit: www.agilent.com/environment/product for more information. Agilent Technologies, through Rechargeable Battery Recycling Corporation (RBRC), offers free and convenient battery recycling options in the U.S. and Canada. Contact RBRC at 877-2-RECYCLE (877.273.2925) or online at: http://www.call2recycle.org/ for the nearest recycling location.

  • Page 9: In This Guide

    In This Guide… Getting Started This chapter contains information on the Agilent U1251A and U1252A handheld multimeter front panel, rotary switch, keypad, display, terminals and rear panel. Making Measurements This chapter contains information on how to make measurements using the U1251A and U1252A handheld digital multimeter. Functions and Features This chapter contains information on the functions and features that are available for the U1251A and U1252A digital multimeter.
  • Page 10 Declaration of Conformity (DoC) The Declaration of Conformity (DoC) for this instrument is available on the Web site. You can search the DoC by its product model or description. http://regulations.corporate.agilent.com/DoC/search.htm N O T E If you are unable to search for the respective DoC, please contact your local Agilent representative.

  • Page 11: Table Of Contents

    Contents Getting Started Introducing the U12521A/U1252A Handheld Digital Multimeter Check the shipment Adjusting the tilt-stand The rear panel at a glance The keypad at a glance The display at a glance Selecting display with the Hz button Selecting display with the Dual button Selection display with the Shift button The terminals at a glance Making Measurements...
  • Page 12 Overload alert Input warning Charge terminal alert Functions and Features Dynamic Recording Data Hold (Trigger Hold) Refresh Hold Null (Relative) Decibel Display 1 ms Peak Hold Data Logging Manual logging Interval logging Reviewing logged data Square Wave Output (for U1252A) Remote Communication Changing The Default Setting Selecting Setup Mode...
  • Page 13 Replacing the fuse Troubleshooting Replaceable Parts To order replaceable parts Performance Tests and Calibration Calibration Overview Closed-case electronic calibration Agilent Technologies calibration services Calibration interval Adjustment is recommended Recommended Test Equipment Basic Operating Test Backlit test Abbreviated Book Title Variable (Edit this)
  • Page 14 Testing the display Current terminal test Charge terminal alert test Test Considerations Calibration Security Performance Verification Tests Unsecuring the instrument for calibration Calibration process Using the front panel for adjustments Adjustments Consideration Valid adjustment input values Adjustment procedure Finishing the adjustment To read the calibration count Calibration errors Specifications...
  • Page 15 Peak Hold Specifications Frequency Counter Specifications for U1252A Square Wave Output for U1252A Operating Specifications Display update rate (approximate) Input impedance Abbreviated Book Title Variable (Edit this) XVII...
  • Page 16 XVIII Abbreviated Book Title Variable (Edit this)
  • Page 17 List of Figures Figure 1-1 Tilt-stand at 60° Figure 1-2 Tilt-stand at 30° Figure 1-3 Tilt-stand at hanging position Figure 1-4 U1252A front panel Figure 1-5 Rear panel Figure 1-6 Rotary switch Figure 1-7 U1252A keypad Figure 1-8 Display symbols Figure 1-9 U1252A connector terminals Figure 2-1...
  • Page 18 Figure 3-8 Full Log Figure 3-9 Interval (Automatic) logging mode operation Figure 3-10 Log review mode operation Figure 3-11 Frequency adjustment for square wave output Figure 3-12 Pulse width adjustment for square wave output Figure 3-13 Duty cycle adjustment for Square Wave Figure 3-14 Cable connection for remote communication Figure 4-1...
  • Page 19 List of Tables Table 1-1 Rotary switch description and functions Table 1-2 Keypad desciption and functions Table 1-3 General display symbols Table 1-4 Priamry display symbols Table 1-5 Secondary display symbols Table 1-6 Analog bar range and counts Table 1-7 Selecting display with the Hz button Table 1-8 Selecting display with the Dual button...
  • Page 20 Table 7-7 U1252A true RMS ac+dc current specifications Table 7-8 Capacitance specifications Table 7-9 Temperature specifications Table 7-10 Frequency specifications Table 7-11 Duty cycle and pulse width specifications Table 7-12 Frequency sensitivity and trigger level specifications for voltage measurements Table 7-13 Frequency sensitivity specifications for current measurements Table 7-14...
  • Page 21 Selecting display with the Dual button Selection display with the Shift button The terminals at a glance This chapter contains information on the Agilent U1251A and U1252A handheld multimeter front panel, rotary switch, keypad, display, terminals and rear panel. Agilent Technologies...

  • Page 22: Introducing The U12521A/U1252A Handheld Digital Multimeter

    Getting Started Tutorial Introducing the U12521A/U1252A Handheld Digital Multimeter Key features of this digital multimeter: • DC, AC, and AC + DC (U1252A only) voltage and current measurements. • True- RMS measurement for both AC voltage and current • Rechargeable Ni- MH battery with built- in charging capability (U1252A only) •...

  • Page 23: Check The Shipment

    Getting Started Tutorial Check the shipment Verify that you have received the following items with your multimeter: • 9 V alkaline battery (for U1251A only) • Soft carrying case • 4 mm probes • Test leads • Alligator clips • SMT grabbers •...

  • Page 24: Adjusting The Tilt-Stand

    Getting Started Tutorial Adjusting the tilt-stand ° To adjust the meter to a 60 standing position, pull the tilt- stand outwards to its maximum reach. IR-USB cable To PC (host) ° Tilt-stand at 60 ° Figure 1-1 Tilt-stand at 60 °...

  • Page 25: Figure 1-3 Tilt-Stand At Hanging Position

    Getting Started Tutorial To adjust the meter to a hanging position follow the steps shown in Figure 1- 3 below. 2. Detach the tilt-stand 1. Extend the tilt-stand until its maximum reach 4. Re-attach the tilt-stand to an upright position 3.

  • Page 26: Figure 1-4 U1252A Front Panel

    Getting Started Tutorial The front panel at a glance Display Keypad Rotary switch Terminal Connectors Figure 1-4 U1252A front panel Agilent U1251A/U1252A User’s and Service Guide...

  • Page 27: The Rear Panel At A Glance

    Getting Started Tutorial The rear panel at a glance IR communication port Test probe holders Tilt-stand Battery access cover Figure 1-5 Rear panel Agilent U1251A/U1252A User’s and Service Guide...

  • Page 28: Figure 1-6 Rotary Switch

    Getting Started Tutorial The rotary switch at a glance Figure 1-6 Rotary switch Table 1-1 Rotary switch description and functions Description/Function Charge mode (U1252A only) or OFF AC voltage AC voltage, DC voltage or DC+AC voltage (U1252A only) DC mV, AC mV, AC+DC mV (U1252A only) Resistance (Ω), Continuity, and Conductance ( nS ) Frequency counter (U1252A only) or Diode Capacitance or Temperature...

  • Page 29: The Keypad At A Glance

    Getting Started Tutorial The keypad at a glance The operation of each key is shown below. Pressing a key illuminates a related symbol on the display and emits a beep from the multimeter. Turning the rotary switch to another position resets the current operation of the key. Figure 1- 7 below shows the keypad of the U1252A.
  • Page 30 Getting Started Tutorial Button Function when pressed for less than 1 second Function when pressed for more than 1 second scrolls through the measuring function(s) at a enters Log Review mode. Press particular rotary switch position. switch to manual or interval logging data. Press to view first or last logged data respectively.

  • Page 31: The Display At A Glance

    Getting Started Tutorial The display at a glance To view the full display (with all segments illuminated), press and hold the button while turning the rotary switch from OFF to any non- OFF position. After you have finished viewing the full display, press any button to resume normal functionality based on the rotary switch position.

  • Page 32: Table 1-3 General Display Symbols

    Getting Started Tutorial Table 1-3 General display symbols LCD symbol Description Remote control Thermocouple types: (K-type) (J-type) NULL Null math function Diode / Audible continuity Audible continuity for resistance View mode for checking logged data Data logging indication Square wave output (U1252A only) •...

  • Page 33: Table 1-4 Priamry Display Symbols

    Getting Started Tutorial The primary display signs are explained below. Table 1-4 Priamry display symbols LCD symbol Description Auto range AC + DC Polarity, digits, and decimal points for primary display Decibel unit relative to 1 mW Decibel unit relative to 1 V MkHz Frequency units: Hz, kHz, MHz Resistance units: Ω, kΩ, MΩ...

  • Page 34: Table 1-5 Secondary Display Symbols

    Getting Started Tutorial The secondary display signs are explained below. Table 1-5 Secondary display symbols LCD symbol Description AC + DC Polarity, digits and decimal points for secondary display Frequency units: Hz, kHz No ambient temperature compensation, just thermocouple measurement ºC Celsius ambient temperature unit ºF...

  • Page 35: Table 1-6 Analog Bar Range And Counts

    Getting Started Tutorial The “+” or “–” sign is indicated when the positive or negative value has been measured or calculated. Each segment represents 2500 or 500 counts depending on the range indicated on the peak bar graph. See the Table 1- 6 below.

  • Page 36: Selecting Display With The Hz Button

    Getting Started Tutorial Selecting display with the Hz button The frequency measurement feature helps to detect the presence of harmonic currents in neutral conductors and determines whether these neutral currents are the result of unbalanced phases or non- linear loads. Press to access the frequency measurement mode for current or voltage measurements —...
  • Page 37 Getting Started Tutorial Table 1-7 Selecting display with the Hz button (continued) Frequency (Hz) AC + DC mV Pulse width (ms) (AC + DC voltage) Duty cycle (%) [for U1252A] Frequency (Hz) AC µA Pulse width (ms) (AC Current) Duty cycle (%) Frequency (Hz) DC µA Pulse width (ms)

  • Page 38: Selecting Display With The Dual Button

    Getting Started Tutorial Selecting display with the Dual button Press to select different combinations of dual display. Normal single display resumes after you press and hold for more than 1 second. See Table 1- 8 below. Table 1-8 Selecting display with the Dual button Rotary switch position (Function) Primary display Secondary display...
  • Page 39 Getting Started Tutorial Table 1-8 Selecting display with the Dual button AC + DC mV Hz (AC coupling) dBm or dBV AC + DC mV (AC + DC voltage) AC + DC mV AC mV AC + DC mV DC mV Ambient temperature °C or °F AC + DC mV DC μA...

  • Page 40: Selection Display With The Shift Button

    Getting Started Tutorial Table 1-8 Selecting display with the Dual button AC + DC A Hz (AC coupling) AC + DC A AC A (AC + DC current) AC + DC A DC A [for U1252A] Ambient temperature °C or °F AC + DC A nF / V / Ω...
  • Page 41 Getting Started Tutorial Table 1-9 Selecting display with the Shift button DC mV for U1252A AC mV (AC + DC Voltage) AC + DC mV Ω Ω Ω (Resistance) Diode (Diode Test and Frequency) Capacitance / TEMP Temperature (Capacitance and Temperature) DC μA AC μA AC + DC μA [for U1252A]...

  • Page 42: The Terminals At A Glance

    Getting Started Tutorial The terminals at a glance To avoid damaging the multimeter, do not exceed the input limit. WA R N I N G Figure 1-9 U1252A connector terminals Table 1-10 Terminal connections for different measuring functions Rotary switch position Input terminals Overload protection V .

  • Page 43: Making Measurements

    Measuring Resistance, Conductance and Testing Continuity Testing Diodes Measuring Capacitance Measuring Temperature Alerts and Warning During Measurement Overload alert Input warning Charge terminal alert This chapter contains information on how to make measurements using the U1251A and U1252A handheld digital multimeter. Agilent Technologies...

  • Page 44: Understanding The Measurement Instructions

    2 Making Measurements Understanding The Measurement Instructions When making measurements, follow the numerical steps labelled in the diagrams. Refer to Table 2- 1 below for a description of the steps. Table 2-1 Numerical steps descriptions Instructions Turn the rotary switch to the measurement option shown in the diagram Connect the test leads into the input terminals shown in the diagram Probe the test points Read the results on the display...

  • Page 45: Measuring Ac Voltage

    Making Measurements 2 Measuring AC voltage Set up the multimeter to measure AC voltage as shown in Figure 2- 1. Probe the test points and read the display. Red Lead Black Lead Figure 2-1 Measuring AC voltage Press to display frequency on secondary display. See Table 1-8 N O T E “Selecting display with the Dual button”...

  • Page 46: Measuring Dc Voltage

    2 Making Measurements Measuring DC voltage Set up the multimeter to measure DC voltage as shown in Figure 2- 2. Probe the test points and read the display. Red Lead Black Lead Figure 2-2 Measuring DC voltage Agilent U1251A/U1252A User’s and Service Guide...

  • Page 47: Measuring Current

    Making Measurements 2 Measuring Current µA & mA measurement Set up the multimeter to measure μA & mA as shown in Figure 2- 3. Probe the test points and read the display. • Press if necessary to ensure is shown on the display. N O T E •...

  • Page 48: Figure 2-3 Measuring Ma And Ma Current

    2 Making Measurements Black Lead Red Lead Figure 2-3 Measuring μA and mA current Agilent U1251A/U1252A User’s and Service Guide...

  • Page 49: Percentage Scale Of 4 Ma To 20 Ma

    Making Measurements 2 Percentage scale of 4 mA to 20 mA Set up the multimeter to measure percentage scale as shown Figure 2- 4. Probe the test points and read the display. • Press to select percentage scale display. Ensure that N O T E is shown on the display.

  • Page 50: Figure 2-4 Measuring Scale Of 4-20 Ma

    2 Making Measurements Black Lead Red Lead Figure 2-4 Measuring scale of 4-20 mA Agilent U1251A/U1252A User’s and Service Guide...

  • Page 51: A (Ampere) Measurement

    Making Measurements 2 A (ampere) measurement Set up the multimeter to measure A (ampere) as shown in Figure 2- 5. Probe the test points and read the display. Connect the red and black test leads to the 10 A input terminal A and COM N O T E respectively.

  • Page 52: Frequency Counter

    2 Making Measurements Frequency Counter • Use the frequency counter for low voltage applications only. Never use WA R N I N G the frequency counter for line power system. • For inputs more than 30 Vpp, you are required to use frequency measurement mode available under the current or voltage measurement instead of frequency counter.

  • Page 53: Figure 2-6 Measuring Frequency

    Making Measurements 2 Black Lead Red Lead Figure 2-6 Measuring frequency Agilent U1251A/U1252A User’s and Service Guide...

  • Page 54: Measuring Resistance, Conductance And Testing Continuity

    2 Making Measurements Measuring Resistance, Conductance and Testing Continuity Disconnect the circuit power and discharge all high-voltage capacitors C A U T I O N before measuring the resistance to prevent any possible damage to the multimeter or the device under test. Set up the multimeter to measure resistance as shown in Figure 2- 7.

  • Page 55: Figure 2-8 Audible Continuity, Conductance, And Resistance

    Making Measurements 2 Press to scroll through audible continuity, conductance and resistance tests as shown in Table 2- Press SHIFT Audible continuity Press Press SHIFT Figure 2-8 Audible continuity, conductance, and resistance test. Agilent U1251A/U1252A User’s and Service Guide...

  • Page 56: Table 2-3 Audible Continuity Measurement Range

    2 Making Measurements Audible continuity In the range of 0–500 Ω, the beeper will sound if the resistance value falls below 10 Ω. For other ranges, the beeper will sound if the resistance falls below the typical values indicated in Table 2- 3 below.

  • Page 57: Figure 2-9 Conductance Measurement

    Making Measurements 2 Ω Black Lead Red Lead Figure 2-9 Conductance measurement Agilent U1251A/U1252A User’s and Service Guide...

  • Page 58: Testing Diodes

    2 Making Measurements Testing Diodes Disconnect the circuit power and discharge all the high-voltage capacitors C A U T I O N before testing the diodes to prevent any possible damage to the meter. To test a diode, turn the power off to the circuit and remove the diode from the circuit.

  • Page 59: Figure 2-10 Measuring Forward Bias Of Diode

    Making Measurements 2 Black Lead Red Lead Figure 2-10 Measuring forward bias of diode Agilent U1251A/U1252A User’s and Service Guide...

  • Page 60: Figure 2-11 Measuring Reverse Bias Of Diode

    2 Making Measurements Black Lead Red Lead Figure 2-11 Measuring reverse bias of diode Agilent U1251A/U1252A User’s and Service Guide...

  • Page 61: Measuring Capacitance

    Making Measurements 2 Measuring Capacitance Disconnect the circuit power and discharge all the high-voltage capacitors C A U T I O N before measuring the capacitance to prevent any possible damage to the meter or the device under test. To confirm that the capacitors have discharged, use the DC voltage function.

  • Page 62: Figure 2-12 Capacitance Measurements

    2 Making Measurements TEMP Red Lead Black Lead Figure 2-12 Capacitance measurements Agilent U1251A/U1252A User’s and Service Guide...

  • Page 63: Measuring Temperature

    Making Measurements 2 Measuring Temperature Do not bend the thermocouple leads at sharp angles. Repeated bending C A U T I O N over a period of time may break the leads. The bead type thermocouple probe is suitable for making temperature measurements between –20 °C to 200 °C in PTFE compatible environments.

  • Page 64: Figure 2-13 Connecting The Thermal Probe Into The Non-Compensation Transfer Adapter

    2 Making Measurements 8 For a quick measurement, use the 0 °C compensation adapter to see the temperature variation of the thermocouple sensor. The 0 °C compensation adapter assists in measuring the relative temperature immediately. Figure 2-13 Connecting the thermal probe into the non-compensation transfer adapter Figure 2-14 Connecting the probe with adapter into the multimeter Agilent U1251A/U1252A User’s and Service Guide...
  • Page 65 Making Measurements 2 If you are working in a constantly varying environment, where ambient temperatures are not constant, do the following: 1 Press to select 0 °C compensation. This gives a quick measurement of the relative temperature. 2 Avoid contact between the thermocouple probe and the measurement surface.

  • Page 66: Figure 2-15 Surface Temperature Measurement

    2 Making Measurements TEMP Figure 2-15 Surface temperature measurement Agilent U1251A/U1252A User’s and Service Guide...

  • Page 67: Alerts And Warning During Measurement

    Making Measurements 2 Alerts and Warning During Measurement Overload alert For your safety, look out for this alert. When you are alerted, WA R N I N G immediately remove the test leads from the measuring source. The meter provides an overload alert for voltage measurements in both auto and manual range modes.

  • Page 68: Charge Terminal Alert

    2 Making Measurements Charge terminal alert The meter sounds an alert beep when the terminal detects a voltage level of more than 5 V and the rotary switch is not set to the corresponding location. The primary display indicates a flashing “Ch.Err” until the lead is removed from the input terminal.

  • Page 69: Functions And Features

    1 ms Peak Hold Data Logging Manual logging Interval logging Reviewing logged data Square Wave Output (for U1252A) Remote Communication This chapter contains information on the functions and features that are available for the U1251A and U1252A digital multimeter. Agilent Technologies...

  • Page 70: Dynamic Recording

    Features and Functions Dynamic Recording The Dynamic Recording mode can be used to detect intermittent turn- on or turn- off voltage, current surges or to verify measurement performance without you being present during the process. While the readings are being recorded, you are free to perform other tasks.

  • Page 71: Figure 3-1 Dynamic Recording Mode Operation

    Features and Functions Press Max Min Press Max Min for > 1 sec Press Max Min for > 1 sec or press for > 1 sec Press Max Min Press Max Min for > 1 sec or press for > 1 sec Press Max Min Press Max Min for >...

  • Page 72: Data Hold (Trigger Hold)

    Features and Functions Data Hold (Trigger Hold) The data hold function allows the user to freeze the displayed digital value. 1 Press to freeze the displayed value and to enter the manual trigger mode. TRIG is displayed. 2 Press again to freeze the next value being measured.

  • Page 73: Refresh Hold

    Features and Functions Refresh Hold The Refresh Hold function allows you to freeze the displayed value. The bar- graph is not held and will continue to reflect the instantaneous measured value. You can use the Setup mode to enable Refresh Hold mode when you are working with fluctuating values.

  • Page 74: Figure 3-3 Refresh Hold Mode Operation

    Features and Functions Press Variation counts > setting The HOLD sign flashes until the measured value is stable and updated Measurement is updated Press to return Figure 3-3 Refresh hold mode operation • For voltage and current measurements, the holding value will not be N O T E updated if the reading is below 500 counts.

  • Page 75: Null (Relative)

    Features and Functions Null (Relative) The Null function subtracts a stored value from the present measurement and displays the difference between the two. 1 Press to store the displayed reading as the reference value to be subtracted from subsequent measurements and to set the display to zero. NULL is displayed.

  • Page 76: Figure 3-4 Null (Relative) Mode Operation

    Features and Functions Press Press Press Figure 3-4 Null (relative) mode operation Agilent U1251A/U1252A User’s and Service Guide...

  • Page 77: Decibel Display

    Features and Functions Decibel Display The dBm operation calculates the power delivered to a reference resistance relative to 1 mW and can be applied to DC V, AC V, and AC + DC V measurements for decibel conversion. The voltage measurement is converted to dBm by using the following formula: The reference resistance may be selected from 1~9999 Ω...

  • Page 78: Figure 3-5 Dbm/Dbv Display Mode Operation

    Features and Functions Press Press Press Press Press Press Press Press Press Press Figure 3-5 dBm/dBV display mode operation Agilent U1251A/U1252A User’s and Service Guide...

  • Page 79: Ms Peak Hold

    Features and Functions 1 ms Peak Hold The Peak Hold function allows the measurement of peak voltage for analysis of components such as power distribution transformers and power factor correction capacitors. The peak voltage obtained can be used to deter- mine the crest factor: Crest factor = Peak value/True RMS value 1 Press...

  • Page 80: Figure 3-6 1 Ms Peak Hold Mode Operation

    Features and Functions Press Press Press Press Press Press Figure 3-6 1 ms peak hold mode operation Agilent U1251A/U1252A User’s and Service Guide...

  • Page 81: Data Logging

    Features and Functions Data Logging The data logging function provides the convenience of recording test data for future review or analysis. Since data is stored in nonvolatile memory, the data remains saved even if the multimeter is turned OFF or the battery is changed.

  • Page 82: Figure 3-7 Hand (Manual) Logging Mode Operation

    Features and Functions Press Press Figure 3-7 Hand (Manual) logging mode operation The maximum data that can be stored is 100 entries. When the 100 entries N O T E are filled, the secondary display indicates “FULL”, as shown in Figure 3-8.

  • Page 83: Interval Logging

    Features and Functions Interval logging Firstly, ensure that interval (time) logging is specified in Setup mode. 1 Press for more than 1 second to store the present value and function on the primary display into the non- volatile memory. The and the logging index will be indicated.

  • Page 84: Figure 3-9 Interval (Automatic) Logging Mode Operation

    Features and Functions Press Press Press Figure 3-9 Interval (Automatic) logging mode operation Agilent U1251A/U1252A User’s and Service Guide...

  • Page 85: Reviewing Logged Data

    Features and Functions Reviewing logged data 1 Press for more than 1 second to enter the Log Review mode. The last recorded entry and the last logging index are displayed. 2 Press to switch between hand (manual) and interval (automatic) logging review mode. 3 Press to ascend or to descend through the logged...

  • Page 86: Figure 3-10 Log Review Mode Operation

    Features and Functions Press Press Press Press Press Press Press Press Press Press Press Press Press Press Press Press Press Press Press Figure 3-10 Log review mode operation Agilent U1251A/U1252A User’s and Service Guide...

  • Page 87: Square Wave Output (For U1252A)

    Features and Functions Square Wave Output (for U1252A) The square wave output function can be used to generate a PWM (pulse width modulation) output or provide a synchro- Press nous clock source (baud rate generator). You can also use this function to check and calibrate flow- meter displays, counters, tachometers, oscilloscopes, frequency converters, frequency transmitters, and other frequency input devices.

  • Page 88: Figure 3-11 Frequency Adjustment For Square Wave Output

    Features and Functions Figure 3-11 Frequency adjustment for square wave output 5 Press to select the pulse width (ms) on the primary display. 6 Press to adjust the pulse width. The pulse width can be set for 256 steps and each step is 1/ (256 x Frequency).

  • Page 89: Figure 3-12 Pulse Width Adjustment For Square Wave Output

    Features and Functions Press Press Press Press Press Press Press Press Figure 3-12 Pulse width adjustment for square wave output Agilent U1251A/U1252A User’s and Service Guide...

  • Page 90: Figure 3-13 Duty Cycle Adjustment For Square Wave

    Features and Functions Figure 3-13 Duty cycle adjustment for Square Wave Agilent U1251A/U1252A User’s and Service Guide...

  • Page 91: Remote Communication

    Features and Functions Remote Communication The meter has a bi- directional (full duplex) communication capability that speeds data storing from the meter to the PC. To use this feature, you are required to use the optional IR- USB cable with the application software included in the CD or downloadable from the Agilent Web site.
  • Page 92 Features and Functions Agilent U1251A/U1252A User’s and Service Guide...
  • Page 93 Setting Parity Check Setting Data Bit Setting Echo Mode Setting Print Mode Returning to Default Factory Settings This chapter shows you how to change the default factory settings of the U1251A and U1252A and other available setting options Agilent Technologies...

  • Page 94: Changing The Default Setting

    Changing The Default Setting Selecting Setup Mode To enter the Setup mode, perform the following steps: 1 Turn the meter OFF. 2 From the OFF position, press and hold while turning the rotary switch to any non- OFF position. When you hear a beep, the meter is in Setup mode and you can release N O T E To change a menu item setting in Setup mode, perform the following steps:...

  • Page 95: Table 4-1 Available Setting Options In Setup Mode

    Changing The Default Setting Table 4-1 Available setting options in Setup mode Menu Item Available setting options Default factory setting Display Description Display Description Enables Data Hold (manual trigger) rHoLd Refresh Hold Sets the variation count that determines Refresh 100–1000 Hold (auto trigger) Enables the reset of factory settings by pressing rESEt...
  • Page 96 Changing The Default Setting Table 4-1 Available setting options in Setup mode (continued) tYPE K Sets the thermocouple type to K-type tYPE K t.CoUP Thermocouple tYPE J Sets the thermocouple type to J-type Hand Enables manual data logging d-LoG Hand Data logging Sets the interval for automatic data logging 1–9999 s...

  • Page 97: Setting Data Hold/Refresh Hold Mode

    Changing The Default Setting Setting Data Hold/Refresh Hold Mode 1. Set OFF to enable the Data Hold mode (manual trigger by key or bus via the remote control). 2. Set the variation count within the 100 to 1000 range to enable the Refresh Hold mode (auto trigger).

  • Page 98: Setting Data Logging Mode

    Changing The Default Setting Setting Data Logging Mode 1 Set to “Hand” to enable the manual data logging mode. 2 Set the interval within 0001 to 9999 seconds to enable interval (automatic) data logging mode. 3 Press and hold for more than 1 second to switch between manual and interval data logging setup.

  • Page 99: Setting Thermocouple Types (U1252A Only)

    Changing The Default Setting Setting Thermocouple Types (U1252A only) The thermocouple sensor types that can be selected are type- K (default) or type- J. Press to switch between the J and the K type. Press Figure 4-3 Thermocouple type setup Agilent U1251A/U1252A User’s and Service Guide...

  • Page 100: Setting Reference Impedance For Dbm Measurement

    Changing The Default Setting Setting Reference Impedance for dBm Measurement The reference impedance can be set from 1 to 9999 W. The default value is 50 W. Press Press Press Press Figure 4-4 Reference impedance for dBm measurement setup Agilent U1251A/U1252A User’s and Service Guide...

  • Page 101: Setting Minimum Frequency Measurement

    Changing The Default Setting Setting Minimum Frequency Measurement The minimum frequency setup influences the measuring rates for frequency, duty cycle, and pulse width. The typical measuring rate defined at the general specification is based on the minimum frequency of 1 Hz. Press Press Press...

  • Page 102: Setting Temperature Unit

    Changing The Default Setting Setting Temperature Unit Four combination displays are available: • Celsius only (°C on primary display) single display setting • Celsius- Fahrenheit (d- CF) and Fahrenheit- Celsius (d- FC) dual display setting. Primary-Secondary Display can be swapped by pressing N O T E •...

  • Page 103: Figure 4-6 Temperature Unit Setup

    Changing The Default Setting Press Press Press Press Press Figure 4-6 Temperature unit setup Agilent U1251A/U1252A User’s and Service Guide...

  • Page 104: Setting Auto Power Saving Mode

    Changing The Default Setting Setting Auto Power Saving Mode • The timer for APF (Auto Power OFF) can be set for the range of 1 to 99 minutes. • To activate the meter after it has “auto powered- off”, turn the rotary switch to the OFF position.

  • Page 105: Figure 4-7 Auto Power Saving Setup

    Changing The Default Setting Press Press Press Press Press Figure 4-7 Auto power saving setup Agilent U1251A/U1252A User’s and Service Guide...

  • Page 106: Setting Percentage (%) Scale Readout

    Changing The Default Setting Setting Percentage (%) Scale Readout This setting converts the DC current measuring display to percentage (%) scale readout — 4—20 mA or 0—20 mA as proportional to 0~100%. The 25% scale readout represents DC 8 mA at 4—20 mA and DC 5 mA at 0—20 mA. Press Figure 4-8 % scale readout setup...

  • Page 107: Setting Beep Frequency

    Changing The Default Setting Setting Beep Frequency The driving frequency can be set to 2400, 1200, 600, or 300Hz. “OFF” disables the beep. Press Press Press Press Press Press Figure 4-9 Beep frequency setup Agilent U1251A/U1252A User’s and Service Guide...

  • Page 108: Setting Backlight Timer

    Changing The Default Setting Setting Backlight Timer • The timer can be set to 1 to 99 seconds. The backlight will turn off automatically after the set period. • “0FF” disables turning off backlit automatically. Press Press Press Press Press Figure 4-10 Backlit timer setup Agilent U1251A/U1252A User’s and Service Guide...

  • Page 109: Setting Baud Rate

    Changing The Default Setting Setting Baud Rate Select the baud rate for remote control. The available settings are 2400, 4800, 9600, and 19200 Hz. Press Press Press Press Press Figure 4-11 Baud rate setup remote control Agilent U1251A/U1252A User’s and Service Guide...

  • Page 110: Setting Parity Check

    Changing The Default Setting Setting Parity Check Select the parity check for remote control. It can be set to none, even, or odd bit. Press Press Press Press Figure 4-12 Parity check setup Agilent U1251A/U1252A User’s and Service Guide...

  • Page 111: Setting Data Bit

    Changing The Default Setting Setting Data Bit Select the data bit for remote control. It can be set to either 8 or 7 bits. Press Figure 4-13 Data bit setup for remote control Agilent U1251A/U1252A User’s and Service Guide...

  • Page 112: Setting Echo Mode

    Changing The Default Setting Setting Echo Mode • Echo ON enables the return of characters to the PC in remote communication. • Echo OFF disables the return of characters to the PC. Press Figure 4-14 Echo mode setup for remote control Agilent U1251A/U1252A User’s and Service Guide...

  • Page 113: Setting Print Mode

    Changing The Default Setting Setting Print Mode Print ON enables the printing of measured data to the PC when the measuring cycle is completed. In this mode, the meter automatically sends the newest data to the host continuously but does not accept any commands from the host.

  • Page 114: Returning To Default Factory Settings

    Changing The Default Setting Returning to Default Factory Settings • Press for more than 1 second to reset to the default factory settings all menu options except the Temperature setting. • The Reset menu item automatically reverts to Refresh Hold menu item after reset has taken place. Press Press for >...

  • Page 115: Maintenance

    General maintenance Battery replacement Storage considerations Charging the battery Fuse checking procedure Replacing the fuse Troubleshooting Replaceable Parts To order replaceable parts This chapter will go through how to troubleshoot the handheld digital multimeter if any problems arise. Agilent Technologies...

  • Page 116: Introduction

    Maintenance Introduction Any repair or service which is not covered in this manual should only C A U T I O N be performed by qualified personnel. General maintenance Ensure that the terminal connections are correct for that particular WA R N I N G measurement before proceeding.

  • Page 117: Figure 5-1 9 V Rectangular Battery

    Maintenance Figure 5-1 9 V rectangular battery 1 At the rear panel, turn the screw on the battery cover from the LOCK to the OPEN position (counterclockwise). 2 Slide down the battery cover. 3 Lift the battery cover up. 4 Replace the specified battery. 5 Reverse the above steps to close the cover.

  • Page 118: Storage Considerations

    Maintenance Storage considerations To avoid instrument damage from battery leakage: C A U T I O N • Always remove dead batteries immediately. • It is recommended that the battery is removed and stored separately if the multimeter is to be unused for long periods of time. After the first charge, it is recommended that you fully charge the battery periodically, even when it is not in use.
  • Page 119 Maintenance C A U T I O N • Do not rotate the rotary switch from position when charging the battery. • Perform battery charging only with a 9 V Ni-MH rechargeable battery (7.2 V nominal voltage) or 9 V size Ni-MH rechargeable battery (8.4 V nominal voltage).

  • Page 120: Figure 5-2 Battery Capacity Display As Trickle

    Maintenance Table 5-1 Battery voltage and corresponding percentage of charges in standby and charging modes Condition Battery voltage Proportional percentage Trickle (SBY) 6.0 V to 8.2 V 0% to 100% Charging 7.2 V to 10.0 V 0% to 100% Figure 5-2 Battery capacity display as trickle 5 After pressing Shift or when the self- test starts, the meter performs a self- test to check if the battery in the meter is the rechargeable type.

  • Page 121: Table 5-2 Error Messages

    Maintenance Table 5-2 Error messages Error Error message 1 No battery inside 2 Faulty battery 3 Battery is fully charged C-Err 1 If charging battery more than 12 V or less than 5 V 2 In 3 minutes, if the battery voltage does not go upwards then charge error Agilent U1251A/U1252A User’s and Service Guide...

  • Page 122: Figure 5-4 Charging Mode

    Maintenance • If the OL message appears while the battery is inside, do not charge the battery. N O T E • If the C-Err message appears, check if the battery is the specified type. Use the battery as specified in this manual. Ensure that the battery is the correct rechargeable type before charging it again.

  • Page 123: Figure 5-5 Charge End And Trickle State

    Maintenance 7 The charge end message (C–End) appears on the secondary display once charging is completed. The trickle charging current is provided to maintain the battery capacity. The flashing signs of appear to show the trickle state. 8 Remove the DC adapter when the C–End message appears on the secondary display.

  • Page 124: Figure 5-6 Battery Charging Procedure

    Maintenance Press Figure 5-6 Battery charging procedure Agilent U1251A/U1252A User’s and Service Guide...

  • Page 125: Fuse Checking Procedure

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

  • Page 126: Replacing The Fuse

    Maintenance 4 To test Fuse 2, place and touch 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. 5 Observe the reading on the instrument's display. Refer to Table 5- 3 for the possible readings that could appear).

  • Page 127: Figure 5-7 Fuse Replacement

    Maintenance 6 Gently remove the defective fuse by prying one end of the fuse loose and removing it out of the fuse bracket. 7 Replace with a new fuse of the same size and rating. Make sure the new fuse is centered in the fuse holder. 8 Ensure that the rotary switch on the top case and the circuit board switch stay on the OFF position.

  • Page 128: Troubleshooting

    Maintenance Troubleshooting To avoid electrical shock, do not perform any service unless you are WA R N I N G qualified to do so. If the instrument fails to operate, check the battery and the test leads. Replace them if necessary. And if the instrument still does not function, check the operating procedures in this manual.

  • Page 129: Replaceable Parts

    Maintenance Replaceable Parts This section contains information for ordering replacement parts for your instrument. you can find the instrument support part list at Agilent’s Test & Measurement Parts Catalog at: http://www.agilent.com/find/parts The parts lists include a brief description of each part with applicable Agilent part number.
  • Page 130 Maintenance Agilent U1251A/U1252A User’s and Service Guide...
  • Page 131 Agilent U1251A and U1252A Handheld Digital Multimeter User’s and Service Guide Performance Tests and Calibration Calibration Overview Closed-case electronic calibration Agilent Technologies calibration services Calibration interval Adjustment is recommended Recommended Test Equipment Basic Operating Test Backlit test Testing the display...

  • Page 132: Performance Tests And Calibration

    The nonvolatile EEPROM calibration memory is retained even when the power is switched off. Agilent Technologies calibration services When your instrument is due for calibration, contact your local Agilent Service Center to enquire about recalibration services.

  • Page 133: Calibration Interval

    Performance Tests and Calibration Calibration interval A 1- year interval is adequate for most applications. Accuracy specifications are warranted only if adjustment is made at regular calibration intervals. Accuracy specifications are not warranted beyond the 1- year calibration interval. Agilent does not recommend extending calibration intervals beyond 2 years for any application.

  • Page 134: Recommended Test Equipment

    Performance Tests and Calibration Recommended Test Equipment The test equipment recommended for the performance verification and adjustment procedures is listed below. If the exact instrument is not available, substitute calibration standards of equivalent accuracy. A suggested alternative method would be to use the Agilent 3458A 8½...

  • Page 135: Basic Operating Test

    Performance Tests and Calibration Basic Operating Test The Basic Operating Test is to test the basic operability of the instrument. Repair is required if the instrument fails the Basic Operating Test. Backlit test Press the Bat button to test the backlight. It will momentarily toggle backlit ON and OFF.

  • Page 136: Current Terminal Test

    Performance Tests and Calibration Current terminal test This test determines if the input warning of the current terminal test is functioning properly. The meter sounds an alert beep when the test lead is inserted into the A terminal but the rotary switch is not set to mA.A function.

  • Page 137: Charge Terminal Alert Test

    Performance Tests and Calibration Charge terminal alert test This test determines if the charge terminal alert is operating properly. The meter sounds an alert when the terminal detects a voltage level of more than 5 V and the rotary switch is not set to the position.

  • Page 138: Test Considerations

    Performance Tests and Calibration Test Considerations Long test leads can also act as antennas which may pick up AC signals. For optimum performance, all procedures should comply with the following recommendations: • Ensure that the calibration ambient temperature is stable and is between 18 °C and 28 °C.

  • Page 139: Calibration Security

    Performance Tests and Calibration Calibration Security The calibration security code prevents accidental or unauthorized adjustments to the instrument. When you first receive your instrument, it is secured. Before you can adjust the instrument, you must unsecure it by entering the correct security code (see “Unsecuring the instrument for calibration”...

  • Page 140: Performance Verification Tests

    Performance Tests and Calibration Performance Verification Tests Use the Performance Verification Tests to verify the measurement performance of the instrument. The performance verification tests use the instrument’s specifications listed in the U1251A/U1252A Data Sheet. The performance verification tests are recommended as acceptance tests when you first receive the instrument.

  • Page 141: Table 6-2 Performance Verification Test Steps

    Performance Tests and Calibration Table 6-2 Performance verification test steps Error from nominal 1 year Step Test Function Range 5520A Output U1251A U1252A Turn the rotary switch to the 5 V, 1 kHz ± 32.5 mV ± 22.5 mV V position 5 V, 10 kHz ±...
  • Page 142 Performance Tests and Calibration Error from nominal 1 year Step Test Function Range 5520A Output U1251A U1252A Turn the rotary switch to ± 2 mV ± 1.75 mV V position (for model U1252A), to V position (for model U1251A) 50 V 50 V ±...
  • Page 143 Performance Tests and Calibration Error from nominal 1 year Step Test Function Range 5520A Output U1251A U1252A ± 75 μV ± 75 μV Turn the rotary switch to the 50 mV 50 mV mV position 500 mV 500 mV ± 0.2 mV ±...
  • Page 144 Performance Tests and Calibration Error from nominal 1 year Step Test Function Range 5520A Output U1251A U1252A Turn the rotary switch to the W 500 W 500 W ± 350 m ± 500 mW position ± 4.5 W ± 3 W 5 kW 5 kW ±...
  • Page 145 Performance Tests and Calibration Error from nominal 1 year Step Test Function Range 5520A Output U1251A U1252A 100.00 μF 100.00 μF ± 1.05 μF ± 1.05 μF 1000.0 μF 1000.0 μF ± 10.5 μF ± 10.5 μF 10.00 mF 10.00 mF ±...
  • Page 146 Performance Tests and Calibration Error from nominal 1 year Step Test Function Range 5520A Output U1251A U1252A Press button to go to 5 A, 1 kHz ± 42 mA ± 37 mA A mode 3 A, 5 kHz ± 96 mA ±...
  • Page 147 Performance Tests and Calibration 11 The current can be measuring from 2.5 A to 10 A continuous, and the additional of 0.5% to specified accuracy as measure the signal greater than 10 A~20 A for 30 seconds maximum. After measured current for > 10 A, to cool down the meter for 2 times of measuring time you applied before low current measurement.

  • Page 148: Unsecuring The Instrument For Calibration

    Performance Tests and Calibration Unsecuring the instrument for calibration Before you can adjust the instrument, you must unsecure it by entering the correct security code. The security code is set to 1234 when the instrument is shipped from the factory. The security code is stored in non- volatile memory, and does not change when power is off.
  • Page 149 Performance Tests and Calibration To change the instrument calibration security code from the front panel 1 When the multimeter is in the unsecured mode, press for more than 1 second to enter the Calibration Security Code setting mode. 2 The factory default calibration security code 1234 will be displayed on the primary display.
  • Page 150 Performance Tests and Calibration To unsecure the instrument without the security code To unsecure the instrument without the correct security code, follow the steps below. If you do not have a record of the security code, you can try 1234 (the fac- N O T E tory default code) using the front panel.

  • Page 151: Calibration Process

    Performance Tests and Calibration Now you can use 1234 as the security code. If you want to enter a new security code, see “To change the instrument calibration security code from the front panel” on page 129. Make sure you record the new security code. Calibration process To complete a full instrument calibration use following general procedures:...

  • Page 152: Using The Front Panel For Adjustments

    Performance Tests and Calibration Using the front panel for adjustments This section describes the procedures to perform adjustments from the front panel. Selecting the Adjustment Mode To unsecure the instrument, see “Unsecuring the instrument for calibration” on page 128 or “To unsecure the instrument without the security code”...

  • Page 153: Adjustments Consideration

    Performance Tests and Calibration Adjustments Consideration You will need a test input cable, a connectors set, and a Shorting Plug to adjust the instrument. After each adjustment, the secondary display briefly shows PASS. If the N O T E calibration fails, the handheld multimeter sounds a beep, and an error number is shown in the secondary display.

  • Page 154: Valid Adjustment Input Values

    Performance Tests and Calibration Valid adjustment input values Adjustment can be accomplished using the following input values below. Table 6-3 Valid adjustment input values Function Range Valid Amplitude Input Values 5 V, 50 V, 500 V, 1000 V 0.9 to 1.1 x Full Scale 5 V, 50 V, 500 V, 1000 V 0.9 to 1.1 x Full Scale (for U1251A)

  • Page 155: Adjustment Procedure

    Performance Tests and Calibration Adjustment procedure Review the sections “Test Considerations” on page 118 and “Adjustments Consideration” on page 133 before proceeding with this procedure. 1 Turn the rotary switch to “Test Function” position as shown in the adjustment table. 2 After unsecuring the instrument, the instrument goes into the adjustment mode.
  • Page 156 Performance Tests and Calibration 8 Press to start the adjustment. The CAL flashes in the secondary display to indicate that the calibration is in progress. For an adjustment that is successful, the secondary display will briefly show PASS. An adjustment failure is indicated by a long beep and a calibration error number appears in the secondary display.

  • Page 157: Table 6-4 Adjustment Table

    Performance Tests and Calibration Table 6-4 Adjustment table Cal Item Step Test Function Cal Range Input U1251A U1252A Turn the rotary switch to the 0.3 V,1 kHz 0.3000 V 0.3000 V V position 3 V, 1 kHz 3.0000 V 3.0000 V 3 V, 50 kHz 3.0000 V 50 V...
  • Page 158 Performance Tests and Calibration Cal Item Step Test Function Cal Range Input U1251A U1252A Press button to go to the 0.3 V, 1 kHz 0.3000 V V mode 3 V, 1 kHz 3.0000 V 3 V, 50 kHz 3.0000 V 50 V 3 V, 1 kHz 03.000 V...
  • Page 159 Performance Tests and Calibration Cal Item Step Test Function Cal Range Input U1251A U1252A Press button to go to the 50 mV 3 mV, 1 kHz 03.000 mV 03.000 mV mV mode 30 mV, 1 kHz 30.000 mV 30.000 mV 30 mV, 50 kHz 30.000 mV 500 mV...
  • Page 160 Performance Tests and Calibration Cal Item Step Test Function Cal Range Input U1251A U1252A Turn the rotary switch to the Open Input terminal oPEn oPEn TEMP/ position open (Remove any test leads and Short Plugs from the input terminal) 10 nF 3 nF 03.000 nF 03.000 nF...
  • Page 161 Performance Tests and Calibration 500 μA 30 μA,1 kHz 030.00 μA 030.00 μA Press button to go to 300 μA,1 kHz 300.00 μA 300.00 μA mA mode 5000 μA 300 μA,1 kHz 0300.0 μA 0300.0 μA 3000 μA, 1 kHz 3000.0 μA 3000.0 μA Turn the Rotary Switch to the...

  • Page 162: Finishing The Adjustment

    Performance Tests and Calibration Finishing the adjustment 1 Remove all the shorting plugs and connectors from the instrument. 2 Record the new Calibration Count. 3 Press simultaneously to exit the Adjustment Mode. Power off and on again. The instrument will then be secured. To read the calibration count You can query the instrument to determine how many calibrations have been performed.

  • Page 163: Calibration Errors

    Performance Tests and Calibration Calibration errors The following errors indicate failures that may occur during a calibration. Number Recommended Accuracy Requirements Calibration error: calibration mode is secured Calibration error: secure code invalid Calibration error: serial number code invalid Calibration error: calibration aborted Calibration error: value out of range Calibration error: signal measurement out of range Calibration error: frequency out of range...
  • Page 164 Performance Tests and Calibration Agilent U1251A/U1252A User’s and Service Guide...

  • Page 165: Specifications

    Peak Hold Specifications Frequency Counter Specifications for U1252A Square Wave Output for U1252A Operating Specifications Display update rate (approximate) Input impedance This chapter lists the product characteristics, specification assumptions and the specifications of the U1251A and U1252A digital multimeters. Agilent Technologies...

  • Page 166: Product Characteristics

    Specifications Product Characteristics POWER SUPPLY Battery type: • 9 V size Ni-MH rechargeable battery, 7.2 V nominal voltage • 9 V size Ni-MH rechargeable battery, 8.4 V nominal voltage • 9 V Alkaline battery (ANSI/NEDA 1604A or IEC 6LR61) • 9 V Carbon-zinc battery (ANSI/NEDA 1604D or IEC6F22) Battery life: •...
  • Page 167 Specifications SAFETY COMPLIANCE • EN/IEC 61010-1:2001 • ANSI/UL 61010-1:2004 • CAN/CSA-C22.2 No. 61010-1-04 MEASUREMENT CATEGORY CAT III 1000 V/CAT IV 600 V Overvoltage Protection EMC COMPLIANCE • Certified to IEC61326-1:2005 / EN61326-1:2006 • CISPR 11:2003 / EN 55011:2007 Group 1 Class A •...
  • Page 168 Specifications WARRANTY Please refer to http://www.agilent.com/go/warranty_terms • Three years for the product • Three months for the product's standard accessories, unless otherwise specified Please take note that for the product, the warranty does not cover: • Damage from contamination • Normal wear and tear of mechanical components •...

  • Page 169: Measurement Category

    Specifications Measurement Category The Agilent U1251A and U1252A Handheld Digital Multimeter has a safety rating of CAT III 1000 V/ CAT IV, 600 V. Measurement category definition Measurement CAT I are measurements performed on circuits which are not directly connected to the AC mains. For example, measurements on circuits not derived from the AC mains or specially protected (internal) mains- derived circuits.

  • Page 170: Specification Assumptions

    Specifications Specification Assumptions • The DC specifications are defined for measurements which are taken after at least 1 minute of warm- up time. • The AC and AC+DC specifications are defined for measurements of sine wave and are taken after at least 1 minute of warm- up time.

  • Page 171: Electrical Specifications

    Specifications Electrical Specifications DC Specifications Table 7-1 DC Accuracy ± (% of reading + Number of Least Significant Digit) Accuracy Test Current/ Function Range Resolution Burden Voltage U1251A U1252A 50.000 mV 0.001 mV 0.05 + 50 0.05 + 50 500.00 mV 0.01 mV 1000.0 mV 0.1 mV...

  • Page 172: Table 7-1 Dc Accuracy ± (% Of Reading + Number Of Least Signifi- Cant Digit)

    Specifications Table 7-1 DC Accuracy ± (% of reading + Number of Least Significant Digit) (continued) Accuracy Test Current/ Function Range Resolution Burden Voltage U1251A U1252A 500.00 µA 0.01 µA 0.06 V 0.1 + 5 0.05 + 5 5000.0 µA 0.1 µA 0.6 V 0.1 + 5...

  • Page 173: Ac Specifications

    Specifications AC Specifications AC specifications for U1251A Table 7-2 U1251A accuracy specifications ± (% of reading + number of LSD) for true RMS AC voltage Frequency Function Range Resolution 30 Hz to 45 Hz 45 Hz to 1 kHz 1 kHz to 10 kHz 10 kHz to 30 kHz 50.000 mV 0.001 mV...

  • Page 174: Table 7-4 U1252A Accuracy Specifications

    Specifications AC specifications for U1252A Table 7-4 U1252A accuracy specifications ± (% of reading + number of LSD) for true RMS AC voltage Frequency 20 Hz – 45 Hz – 1 kHz – 10 kHz – 20 kHz – Function Range Resolution 45 Hz...

  • Page 175: Ac+Dc Specifications For U1252A

    Specifications AC+DC Specifications for U1252A Table 7-6 U1252A true RMS ac+dc voltage specifications Frequency 30 Hz – 45 Hz – 1 kHz – 10 kHz – 20kHz – Function Range Resolution 45 Hz 1 kHz 10 kHz 20 kHz 100kHz 50.000 mV 0.001 mV 1.5 + 80...

  • Page 176: Capacitance Specifications

    Specifications Capacitance Specifications Table 7-8 Capacitance specifications Accuracy Display update rate ± Function Range Resolution (% of reading + (approx) Offset Error) 10.000 nF 0.001 nF 1 % + 8 100.00 nF 0.01 nF 1000.0 nF 0.1 nF 10.000 µF 0.001 µF 4 times/sec.

  • Page 177: Frequency Specifications

    Specifications Frequency Specifications Table 7-10 Frequency specifications Accuracy ± Range Resolution (% of reading + No. of Min. Input Frequency Least Significant Digit) 99.999 Hz 0.001 Hz 999.99 Hz 0.01 Hz 0.02% + 3 9.9999 kHz 0.0001 kHz 1 Hz <...

  • Page 178: Frequency Sensitivity Specifications

    Specifications Frequency Sensitivity Specifications For voltage measurements Table 7-12 Frequency sensitivity and trigger level specifications for voltage measurements Minimum sensitivity (RMS sine wave) Trigger level for DC coupling Model Number Input U1251A U1252A U1251A U1252A range 20 Hz - 100 >100 kHz - 20 Hz - 200 >200 kHz -...

  • Page 179: Peak Hold Specifications

    Specifications For current measurements Table 7-13 Frequency sensitivity specifications for current measurements Minimum Sensitivity (R.M.S. sine wave) Input Range 20 Hz – 20 kHz 500.00 µA 100 µA 5000.0 µA 250 µA 50.000 mA 10 mA 440.00 mA 25 mA 5.0000 A Peak Hold Specifications Table 7-14 Peak hold specifications for dc voltage and current measurements...

  • Page 180: Frequency Counter Specifications For U1252A

    Specifications Frequency Counter Specifications for U1252A Table 7-15 Frequency counter (divide by 1) specifications Accuracy ± (% of reading + No. Range Resolution Sensitivity Min. Input Frequency of Least Significant Digit) 99.999 Hz 0.001 Hz 0.02% + 3 999.99 Hz 0.01 Hz 100 mV R.M.S.

  • Page 181: Square Wave Output For U1252A

    Specifications Square Wave Output for U1252A Table 7-17 Square wave output specifications Output Range Accuracy 0.5, 1, 2, 5, 10, 15, 20, 25, 30, 40, 50, 60, 75, 80, 100, 120, 150, 200, 240, 300, Frequency 0.005% x output frequency + 2 counts 400, 480, 600, 800, 1200, 1600, 2400, 4800 Hz [2][4][5]...

  • Page 182: Operating Specifications

    Specifications Operating Specifications Display update rate (approximate) Table 7-18 Display update rate (approximate) Function Times/second AC V AC V + dB DC V (V or mV) AC V (V or mV) AC+DC V (V or mV) Ω / nS Diode Capacitance 4 (<...

  • Page 183: Input Impedance

    Specifications Input impedance Table 7-19 Input 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 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...
  • Page 184 Specifications Agilent U1251A/U1252A User’s and Service Guide...
  • Page 185 Product specifications and descriptions in this document are subject to change without notice. Always refer to the Agilent Web site for the latest revision. © Agilent Technologies, Inc. 2006–2013 Printed in Malaysia Eleventh Edition, March 7, 2013 U1251-90003 Agilent Technologies...

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