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Features and Functions 3

Agilent U1251A/U1252A User’s and Service Guide

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. Voltage measurement is converted to dBm by
using the following formula:

The reference resistance may

be selected from 1~9999

Setup mode. Default value is 50

The decibel of voltage is calculated with respect to 1 V. The
formula is according to the voltage measurement below:

dBV = 20 log

Vin

rotary switch position, push

to scroll to dBm measurement on the primary

display. AC voltage measurement is indicated on the
secondary display.

Push

for more than 1 second to exit this mode.

N O T E

If rotary switch is at “~ V” position, push

to switch between dBV

and dBm measurements. The dBm or dBV measurement can be selected
at ACV position, the selection will be the reference for other voltage
measurement.

Содержание U1251A

Страница 1: ...Agilent Technologies Agilent U1251A and U1252A Handheld Digital Multimeter User s and Service Guide...

Страница 2: ...er to the max imum extent permitted by applicable law Agilent disclaims all warranties either express or implied with regard to this manual and any information contained herein including but not limit...

Страница 3: ...meter only as specified in this guide Otherwise the protection provided by the meter may be impaired Refer to the safety information below When working above 70V DC 33 V AC RMS or 46 7 V peak exercis...

Страница 4: ...Do not substitute parts or modify equipment to avoid the danger of introducing additional hazards Return the product to Agilent Technologies Sales and Service Office for service and repair to ensure t...

Страница 5: ...and Service Guide 5 Safety Symbols CAT III 1000 V Category III 1000 V Overvoltage Protection Double insulation Earth ground Caution risk of danger Refer to the User s and Service Guide for details Ca...

Страница 6: ...mark is a registered trademark of the Canadian Standards Association The UL mark is a registered trademark of Underwriters Laboratories Inc The C tick mark is a registered trademark of the Spectrum Ma...

Страница 7: ...4 kV CD 8 kV AD IEC 61000 4 3 1995 EN 61000 4 3 1995 3 V m 80 1000 MHz IEC 61000 4 4 1995 EN 61000 4 4 1995 0 5 kV signal lines 1 kV power lines IEC 61000 4 5 1995 EN 61000 4 5 1995 0 5 kV line line...

Страница 8: ...aland AS NZS 2064 1 EMC IEC 61010 1 2001 EN 61010 1 2001 Canada CSA C22 2 No 61010 1 2004 Safety USA UL 61010 1 2004 Additional Information The product herewith complies with the essential requirement...

Страница 9: ...ion of Display by Dual Button 27 Selection of Display by SHIFT Button 30 The Terminals at a Glance 32 The Rear Panel at a Glance 33 2 Making Measurements 35 Measuring Voltage 36 Measuring Current 39 M...

Страница 10: ...up Mode 82 Setting Data Logging Mode 86 Setting Thermocouple Types for U1252A 87 Setting Reference Impedance for dBm Measurement 88 Setting Minimum Frequency Measurement 89 Setting Temperature Unit 90...

Страница 11: ...ing Test 125 Backlit Test 125 Testing the Display 125 Current Terminal Test 126 Charge Terminal Alert Test 127 Test Considerations 128 Input Connections 129 Performance Verification Tests 130 Calibrat...

Страница 12: ...1252A User s and Service Guide Contents U1252A AC DC Specifications 162 Temperature and Capacitance Specifications 163 U1251A U1252A Frequency Specifications 1 164 Operating Specifications 167 General...

Страница 13: ...Stand 15 The Front Panel at a Glance 17 The Rotary Switch at a Glance 18 The Keypad at a Glance 19 The Display at a Glance 21 Selection of Display by Hz Button 25 Selection of Display by Dual Button 2...

Страница 14: ...0 01nS 100G 50nS Capacitance measurement up to 100mF Frequency counter up to 20MHz only U1252A The scale readout for 4 20mA or 0 20mA measurement dBm with selectable reference impedance 1ms Peak Hold...

Страница 15: ...tection Pollution Degree II standards Adjusting the Tilt Stand To adjust the meter to a 60 standing position pull the tilt stand outwards to its maximum reach To adjust the meter to a 30 standing posi...

Страница 16: ...eter to a hanging position flip the stand upwards and over its maximum reach until it is detached from its hinge Then flip the stand over so that the stand s inner surface is facing the meter s rear N...

Страница 17: ...Getting Started Tutorial 1 Agilent U1251A U1252A User s and Service Guide 17 The Front Panel at a Glance Display Keypad Rotary switch Display Terminals...

Страница 18: ...or OFF 2 AC V 3 DC voltage or DC AC voltage U1252A only 4 DC mV AC mV AC DC mV U1252A only 5 Resistance Continuity and Conductance nS 6 Frequency counter U1252A only or Diode 7 Capacitance or Temperat...

Страница 19: ...1 second Function when pushed for more than 1 second 1 acts as a toggle switch to turn backlit ON OFF Backlit automatically turns off after 30s default 1 displays battery capacity for 3 seconds 2 free...

Страница 20: ...dual display modes 7 enters Frequency Test mode for current or voltage measurements Push to scroll through frequency Hz duty cycle and pulse width ms functions In duty cycle and pulse width ms tests...

Страница 21: ...rotary switch position This is followed by a wake up feature The meter will then enter power save mode once auto power off APF is enable To wake the meter up 1 Turn the rotary switch knob to OFF posit...

Страница 22: ...r as capacitance measurement Negative slope for pulse width ms and duty cycle measurement Discharging capacitor as capacitance measurement Low battery indication Auto power off enable Refresh auto Hol...

Страница 23: ...dBm Decibel unit relative to 1 mW dBV Decibel unit relative to 1 V MkHz Frequency units Hz kHz MHz Mk Resistance units k M nS Conductance unit mV Voltage units mV V mA Current units A mA A Duty cycle...

Страница 24: ...20 mA scale and temperature measurements When frequency duty cycle and pulse width are indicated on the primary display during voltage or current measurement the bar graph represents the voltage or c...

Страница 25: ...g on the range indicated on the peak bar graph See the table below Selection of Display by Hz Button The frequency measuring helps to detect the presence of harmonic currents in neutral conductors and...

Страница 26: ...ge or current resumes on primary display after you push and hold for more than 1 second Rotary switch position Function Primary display Secondary display for U1252A AC voltage Frequency Hz AC V Pulse...

Страница 27: ...se width ms Duty cycle AC DC current Frequency Hz AC DC A Pulse width ms Duty cycle AC current Frequency Hz AC mA or A Pulse width ms Duty cycle DC current Frequency Hz DC mA or A Pulse width ms Duty...

Страница 28: ...2A DC voltage DC V Hz DC coupling dBm or dBV 1 DC V DC V AC V for U1252A DC V Ambient temperature C or F for U1252A AC DC voltage AC DC V Hz AC coupling dBm or dBV 1 AC DC V AC DC V AC V AC DC V DC V...

Страница 29: ...ature C or F AC DC A Hz AC coupling AC DC current AC DC A AC A AC DC A DC A AC DC A Ambient temperature C or F DC mA Hz DC coupling DC current DC mA AC mA 0 20 or 4 20 DC mA DC mA Ambient temperature...

Страница 30: ...C current AC DC A AC A AC DC A DC A AC DC A Ambient temperature C or F Capacitance Diode Resistance nS Conductance nF V nS Ambient temperature C or F TEMP Temperature C F Ambient temperature C or F C...

Страница 31: ...MP Capacitance Temperature DC A AC A AC DC A for U1252A DC mA AC mA AC DC mA 0 20 or 4 20 DC A AC A AC DC A for U1252A Square wave output for U1252A Duty cycle Pulse width ms NOTE 1 Push to switch bet...

Страница 32: ...erent measuring functions WARNING To avoid damaging this device do not exceed the input limit Rotary switch position Input terminal Overload protection V mV TEMP COM 1000 V R M S for U1252A V for U125...

Страница 33: ...Getting Started Tutorial 1 Agilent U1251A U1252A User s and Service Guide 33 The Rear Panel at a Glance Figure 3 Rear panel of U1252A IR communication port Test probe holders Battery access cover...

Страница 34: ...34 Agilent U1251A U1252A User s and Service Guide 1 Getting Started Tutorial...

Страница 35: ...cale of 4 20 mA 40 A measurement 41 Frequency Counter 42 Measuring Resistance Conductance and Testing Continuity 44 Testing Diodes 48 Measuring Temperature 52 Alerts and Warning During Measurement 55...

Страница 36: ...se AC DC measurement on or rotary switch location This applies only to U1252A Measuring AC voltage 1 Set the rotary switch to or 2 Connect the red and black test leads to input terminals V mV and COM...

Страница 37: ...Making Measurements 2 Agilent U1251A U1252A User s and Service Guide 37 Figure 3 Measuring AC voltage MAX...

Страница 38: ...Guide 2 Making Measurements Figure 4 Measuring DC voltage Measuring DC voltage 1 Set the rotary switch to and 2 Connect the red and black test leads to input terminals V mV and COM respectively 3 Pro...

Страница 39: ...ide 39 Measuring Current A mA Measurement 1 Set the rotary switch to 2 Connect the red and black test leads to input terminals A mA and COM respectively 3 Probe the test points in series with the circ...

Страница 40: ...sponding DC mA measurement Meter will optimize the best resolution automatically as per the below table The and bar graph is used for ranging 50 mA and 500 mA The scale for 4 20 mA or 0 20 mA is set t...

Страница 41: ...Guide 41 A measurement 1 Set the rotary switch to 2 Connect the red and black test leads to 10A input terminal A and COM respectively The meter is set to A measurement automatically when the red test...

Страница 42: ...als V and COM respectively 4 Probe the test points and read the display 5 If the reading is unstable or zero push to select division of input signal frequency by 100 This accommodates for higher frequ...

Страница 43: ...Making Measurements 2 Agilent U1251A U1252A User s and Service Guide 43 Figure 8 Measuring frequency Push MAX...

Страница 44: ...nS 2 Connect the red and black test leads to input terminals and COM respectively 3 Probe the test points by shunting the resistor and read the display Figure 9 Measuring resistance CAUTION Disconnec...

Страница 45: ...lent U1251A U1252A User s and Service Guide 45 4 Push to scroll through audible continuity conductance and resistance tests as shown in Figure 10 Figure 10 Audible continuity conductance and resistanc...

Страница 46: ...falls below the typical values indicated in the table below Conductance measurement eases measurement of very high resistance of up to 100 G As high resistance readings are susceptible to noise you c...

Страница 47: ...Making Measurements 2 Agilent U1251A U1252A User s and Service Guide 47 Figure 11 Conductance measurement MAX...

Страница 48: ...ge across the diode again Diode test result is based on the following Diode is considered good if the meter displays OL in reverse bias mode Diode is considered shorted if the meter displays approxima...

Страница 49: ...Making Measurements 2 Agilent U1251A U1252A User s and Service Guide 49 Figure 12 Measuring forward bias of diode MAX...

Страница 50: ...50 Agilent U1251A U1252A User s and Service Guide 2 Making Measurements Figure 13 Measuring reverse bias of diode MAX...

Страница 51: ...orrect capacitance value For measuring small capacitances push with the test leads open to subtract the residual capacitance of the meter and leads 1 Set the rotary switch to 2 Connect the red and bla...

Страница 52: ...ember to disable the applied power When measuring above ambient temperature move the thermocouple along the surface until you get the highest temperature reading When measuring below ambient temperatu...

Страница 53: ...e working in a varied environment where ambient temperature is not constant do the following 1 Push to select 0 C compensation This allows a quick measurement of the relative temperature 2 Avoid conta...

Страница 54: ...54 Agilent U1251A U1252A User s and Service Guide 2 Making Measurements Figure 14 Surface temperature measurement Press MAX...

Страница 55: ...or your safety please be aware of this alert Input Warning The meter sounds an alerting beep when the test lead is inserted to the A input terminal but the rotary switch is not set to the correspondin...

Страница 56: ...he meter sounds an alerting 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 E...

Страница 57: ...g 58 Data Hold Trigger Hold 60 Refresh Hold 61 NULL Relative 63 Decibel Display 65 1 ms Peak Hold 67 Data Logging 69 Manual Logging 69 Interval Logging 71 Reviewing Logged Data 73 Square Wave Output f...

Страница 58: ...c onds When this maximum time is exceeded OL is indi cated on the display 1 Push for more than 1 second to enter Dynamic Recording mode Meter is now in continuous mode or non data hold non trigger mod...

Страница 59: ...tions 3 Agilent U1251A U1252A User s and Service Guide 59 Figure 17 Dynamic recording mode operation or Push for 1 s Push MAX MIN for 1 s or Push for 1 s Push MAX MIN for 1 s or Push for 1 s Push MAX...

Страница 60: ...reeze the dis played digital value 1 Push to freeze the displayed value and to enter manual trigger mode TRIG is displayed 2 Push to trigger the freeze of the next value being measured TRIG flashes be...

Страница 61: ...ld This function will auto trigger or update Hold value with new measuring value and sound a tone to remind user Press button to enter Refresh Hold mode The present value will be held and the sign of...

Страница 62: ...e holding value will not be updated if the reading is below 500 counts For resistance and diode measurements the holding value will not be updated if the reading is in OL open state The holding value...

Страница 63: ...tored reference value NULL flashes for 3 seconds before the display returns to zero 3 To exit this mode push while NULL is flashing on the display NOTE Null can be set for both auto and manual range s...

Страница 64: ...64 Agilent U1251A U1252A User s and Service Guide 3 Features and Functions Figure 20 Null relative mode operation...

Страница 65: ...9999 in Setup mode Default value is 50 The decibel of voltage is calculated with respect to 1 V The formula is according to the voltage measurement below dBV 20 log10 Vin 1 At or rotary switch positi...

Страница 66: ...66 Agilent U1251A U1252A User s and Service Guide 3 Features and Functions Figure 21 dBm dBV display mode operation...

Страница 67: ...crest factor Crest factor Peak value True RMS value 1 Push for more than 1 second to toggle 1 ms Peak Hold mode ON OFF 2 Push to scroll through maximum and minimum peak readings MAX indicates maximum...

Страница 68: ...68 Agilent U1251A U1252A User s and Service Guide 3 Features and Functions Figure 22 1 ms peak hold mode operation...

Страница 69: ...ptions offered are hand manual logging and interval automatic logging func tions Data logging records the value on primary display only Manual Logging Hand Manual logging can be specified in Setup mod...

Страница 70: ...ctions Figure 23 Hand Manual logging mode operation Figure 24 Full Log 3 Push for more than 1 second to exit this mode NOTE Maximum data that can be stored is 100 entries When the 100 entries are fill...

Страница 71: ...primary display to memory and the logging index are indicated The reading automatically logs into the memory by every interval set in Setup mode 2 Push for more than 1 second to exit this mode NOTE Th...

Страница 72: ...72 Agilent U1251A U1252A User s and Service Guide 3 Features and Functions Figure 25 Interval Automatic logging mode operation...

Страница 73: ...and interval automatic logging review mode 3 Push to ascend or to descend through logged data Press to select first record and press to select the last record for quick navigation 4 Push for more than...

Страница 74: ...74 Agilent U1251A U1252A User s and Service Guide 3 Features and Functions Figure 26 Log review mode operation...

Страница 75: ...ransmitter and other frequency input devices 1 Turn the rotary switch to position Default display setting is 600 Hz on secondary display and 50 duty cycle on primary display 2 Push or to scroll throug...

Страница 76: ...re 27 Frequency adjustment for square wave output 5 Push to select pulse width on primary display 6 Push or to adjust the pulse width The pulse width can be set for 256 steps and each step is 1 256 x...

Страница 77: ...Features and Functions 3 Agilent U1251A U1252A User s and Service Guide 77 Figure 28 Duty cycle adjustment for square wave output...

Страница 78: ...78 Agilent U1251A U1252A User s and Service Guide 3 Features and Functions Figure 29 Pulse width adjustment for Square Wave...

Страница 79: ...full duplex communication capability that eases data storing from the meter to PC The necessary accessory for this is the optional USB RS232 together with the application software in the accompanying...

Страница 80: ...80 Agilent U1251A U1252A User s and Service Guide 3 Features and Functions Figure 30 Cable Connection for remote communication To PC USB...

Страница 81: ...8 Setting Minimum Frequency Measurement 89 Setting Temperature Unit 90 Setting Auto Power Saving Mode 92 Setting Scale Readout 94 Setting Beep Frequency 95 Setting Backlit Timer 96 Setting Baud Rate 9...

Страница 82: ...position To change a menu item setting in Setup mode perform the following steps 1 Push or to scroll through menu items 2 Push or to scroll through available settings See Table 3 Available setting opt...

Страница 83: ...ed 0 5 Hz 1 Hz 2 Hz 5 Hz Sets minimum frequency that can be measured 0 5 Hz APF Auto power off 1 99 m Sets timer for auto power off 10 m OFF Disables auto power off PErnt Percentage scale 0 20mA 4 20...

Страница 84: ...y pushing and holding for more than 1 second dEFAU tEMP Temperature 4 d CF Sets temperature measurement to C but pushing swaps display to F d CF d F Sets temperature measurement to F d FC Sets tempera...

Страница 85: ...FF to enable Data Hold mode manual trigger by key or bus via remote control 2 Set variation count within 100 1000 range to enable Refresh Hold mode automatic trigger When the variation of measuring va...

Страница 86: ...lt Setting Setting Data Logging Mode 1 Set Hand to enable hand manual data logging mode 2 Set interval within 0001 9999 seconds to enable interval automatic data logging mode 3 Push or to switch betwe...

Страница 87: ...1A U1252A User s and Service Guide 87 Setting Thermocouple Types for U1252A The types of thermocouple sensor that can be selected are J and K types Default type is K type Push or to switch between J a...

Страница 88: ...and Service Guide 4 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 Figure 34 Reference impe...

Страница 89: ...89 Setting Minimum Frequency Measurement The minimum frequency setup influences the measuring rates for frequency duty cycle and pulse width Typical measuring rate defined at the general specificatio...

Страница 90: ...ture 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 Fahrenheit only F on...

Страница 91: ...Changing The Default Setting 4 Agilent U1251A U1252A User s and Service Guide 91 Figure 36 Temperature unit setup...

Страница 92: ...Power Saving Mode The timer for APF Auto Power OFF can be set for the range of 1 99 minutes To activate the meter after it has auto power off turn the rotary switch to the OFF position then turn it ba...

Страница 93: ...Changing The Default Setting 4 Agilent U1251A U1252A User s and Service Guide 93 Figure 37 Auto power saving setup...

Страница 94: ...The Default Setting Setting Scale Readout This setting converts the DC current measuring display to scale readout 4 20 mA or 0 20 mA as proportional to 0 100 The 25 scale readout represents DC 8 mA at...

Страница 95: ...ng The Default Setting 4 Agilent U1251A U1252A User s and Service Guide 95 Setting Beep Frequency The driving frequency can be set to 2400 1200 600 or 300 Hz OFF disables beep Figure 39 Beep frequency...

Страница 96: ...nd Service Guide 4 Changing The Default Setting Setting Backlit Timer Timer can be set to 1 99 seconds Backlit turns off automatically after the set period 0FF disables turning off backlit automatical...

Страница 97: ...Setting 4 Agilent U1251A U1252A User s and Service Guide 97 Setting Baud Rate The baud rate is selected for remote control The available settings are 2400 4800 9600 and 19200 Hz Figure 41 Baud rate s...

Страница 98: ...1251A U1252A User s and Service Guide 4 Changing The Default Setting Setting Parity Check The parity check is selected for remote control It can be set to either none even or odd bit Figure 42 Parity...

Страница 99: ...The Default Setting 4 Agilent U1251A U1252A User s and Service Guide 99 Setting Data Bit Data bit is selected for remote control It can be set to either 8 or 7 bits Figure 43 Data bit setup for remote...

Страница 100: ...1252A User s and Service Guide 4 Changing The Default Setting Setting Echo Mode Echo ON enables return of characters to PC in remote communication Echo OFF disables Echo mode Figure 44 Echo mode setup...

Страница 101: ...Mode Print ON enables print out of measured data to PC when measuring cycle is completed In this mode the meter automatically sends the newest data to the host continuously but does not accept any com...

Страница 102: ...efault Setting Returning to Default Factory Settings Push for more than 1 second to reset to default factory settings except the Temperature setting The Reset menu item automatically reverts to Refres...

Страница 103: ...igital Multimeter User s and Service Guide 5 Maintenance Introduction 104 General Maintenance 104 Battery Replacement 105 Charging Battery 106 Fuse Replacement 113 Troubleshooting 115 This chapter wil...

Страница 104: ...ning steps are as follows 1 Turn the meter off and remove the test leads 2 Turn the meter over and shake out any dirt that may have accumulated in the terminals 3 Wipe the case with a damp cloth and m...

Страница 105: ...flashing If your meter has specified rechargeable battery inside please go to Charging The Battery Below is the procedures for battery replacement 1 At the rear panel turn the screw on the battery cov...

Страница 106: ...res to charge the battery 1 Remove and disconnect the test leads from meter 2 Turn the rotary switch to the position of Plug power cord to DC adapter 3 Plug the Red Black banana terminals of DC adapte...

Страница 107: ...to charge battery or not Press SHIFT button to start charging the battery or the meter will automatically start the self test after 24V supply is applied It is recommended not to charge the battery i...

Страница 108: ...T button or self start the meter will do a self test to check if the battery inside the meter is a rechargeable battery or not The self test will take about 2 3 minutes Avoid from operating any push b...

Страница 109: ...ent U1251A U1252A User s and Service Guide 109 Figure 49 Error messages Error Condition Secondary Display OL No battery in the meter Battery failing Battery is full C Err No rechargeable battery insid...

Страница 110: ...or message maybe indicated during charging to prevent overcharging on the battery Figure 50 Charging mode NOTE If OL message occurs while the battery is inside please do not charge the battery If C Er...

Страница 111: ...s completed The trickle charging current will be provided to maintain the battery capacity The flashing signs of and will be displayed to show the trickle state 8 Remove the DC adapter when the C End...

Страница 112: ...112 Agilent U1251A U1252A User s and Service Guide 5 Maintenance Figure 52 Battery charging procedures...

Страница 113: ...case and remove the cover 5 Lossen two screws on top corners to lift the circuit board 6 Gently remove the defective fuse by prying one end of the fuse loose and removing it out of the fuse bracket 7...

Страница 114: ...114 Agilent U1251A U1252A User s and Service Guide 5 Maintenance Figure 53 Fuse replacement Fuse 1 Fuse 2...

Страница 115: ...unless you are qualified to do so Malfunction Identification No LCD display after power ON Check battery Charge or replace battery No beeper tone Check setup mode and verify if the beeper is set to OF...

Страница 116: ...116 Agilent U1251A U1252A User s and Service Guide 5 Maintenance...

Страница 117: ...eld Digital Multimeter User s and Service Guide 6 Accessories Checking the Shipping Contents 118 List of Accessories 119 This chapter contains information on the standard and optional accessories It i...

Страница 118: ...th your multimeter Soft carrying case 9 V alkaline battery Rechargeable 7 2 V battery for U1252A only Power cord AC adapter for U1252A only Standard Test Lead Kit Quick Start Guide CD containing the U...

Страница 119: ...Battery x Standard U1160A Test Probe Leads x x Alligator Clips x x SMT Grabber x x Fine Tips Test Probes x x Mini Grabber black only x x Optional U1180A T C Adapter non compensation transfer adap ter...

Страница 120: ...120 Agilent U1251A U1252A User s and Service Guide 6 Accessories...

Страница 121: ...ment 124 Basic Operating Test 125 Test Considerations 128 Performance Verification Tests 130 Calibration Security 138 Calibration Process 142 Adjustments Consideration 144 This chapter contains perfor...

Страница 122: ...until the next calibration adjustment is performed Non volatile EEPROM calibration memory does not change when power has been off Agilent Technologies Calibration Services When your instrument is due...

Страница 123: ...select Agilent recommends that complete re adjustment should always be performed at the calibration interval This will assure that the U1251A U1252A will remain within specification for the next cali...

Страница 124: ...ent Recommended Accuracy Requirements DC Voltage Fluke 5520A 1 5 instrument 1 year spec DC Current Fluke 5520A 1 5 instrument 1 year spec Resistance Fluke 5520A 1 5 instrument 1 year spec AC Voltage F...

Страница 125: ...ity 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 momen tarily toggle backlit ON and OFF Testing...

Страница 126: ...g properly The meter sounds an alert beep when the test lead is inserted to A terminal but rotary switch is not set to mA A function The primary display will indicate A Err It is shown in Figure 55 Th...

Страница 127: ...ng properly The meter sounds an alert when the terminal detects a voltage level of more than 5V but rotary switch is not set to position The meter sounds an alert beep and primary display indicates an...

Страница 128: ...t as possible Connect the input cable shields to earth ground Except where noted in the procedures connect the calibrator LO source to earth ground at the calibrator It is important that the LO to ear...

Страница 129: ...dual banana plug with copper wire short between two terminals for low thermal offset measurement Shielded twisted pair Teflon interconnect cables of minimum length are recommended between the calibrat...

Страница 130: ...when you first receive the instrument The acceptance test results should be compared against the 1 year test limits After acceptance you should repeat the per formance verification tests at every cal...

Страница 131: ...22 5 mV 5 V 20 kHz N A 41 5 mV 5 V 30 kHz 84 mV N A 5 V 100 kHz N A 187mV 50 V 50 V 1 kHz 325 mV 225 mV 50 V 10 kHz 525 mV 225 mV 50 V 20 kHz N A 415 mV 50 V 30 kHz 840 mV N A 50 V 100 kHz N A 1 87 V...

Страница 132: ...ion for model U1251A 5 V 5 V 2 mV 1 75 mV 50 V 50 V 20 mV 17 5 mV 500 V 500 V 200 mV 200 mV 1000 V 1000 V 800 mV 800 mV 5 Press button to go to the V mode 1 5 V 5 V 1 kHz N A 22 5 mV 5 V 10 kHz N A 22...

Страница 133: ...1000 mV 0 8 mV 0 75 mV 7 Press button to go to the mV mode 1 50 mV 50 mV 1 kHz 0 34 mV 0 24 mV 50 mV 10 kHz 0 54 mV 0 39 mV 50 mV 20 kHz N A 0 415 mV 50 mV 30 kHz 0 86 mV N A 50 mV 100 kHz N A 1 87 mV...

Страница 134: ...MW 9 Press button to go to ns mode 500 nS 5 50 nS 0 7 nS 0 6 nS 10 Turn the rotary switch to the Hz position for model U1252A to position for model U1251A Diode 1 V 1 mV 1 mV 33250A Output 11 Press b...

Страница 135: ...n 500 A 500 A 0 55 A 9 0 3 A 9 5000 A 5000 A 5 5 A 9 3 A 9 16 Press button to go to uA mode 1 500 A 500 A 1 kHz 4 2 A 3 7 A 500 A 20 kHz 15 8 A 3 95 A 5000 A 5000 A 1 kHz 42 A 37 0 A 5000 A 20 kHz 0 1...

Страница 136: ...252A 19 Press button to go to A mode 5 A 5 A 1 kHz 42 mA 37 mA 3A 3 A 5 kHz 96 mA 96 mA 10 A 11 10 A 1 kHz 100 mA 90 mA Square Wave Output Use 53131A 20 Turn the rotary switch to the position 120 Hz 5...

Страница 137: ...rmocouple probe The thermal sensor plugged into the meter should be placed in the operating enviroment for at least an hour Use Null function to reduce the thermal effect 9 Always use relative functio...

Страница 138: ...ing the Instrument for Calibration on page 139 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 w...

Страница 139: ...ity code is stored in non volatile memory and does not change when power has been off To Unsecure the Instrument from the Front Panel 1 Turn the rotary switch to 2 Press and button simultaneously to e...

Страница 140: ...han 1 second to enter Calibration Security Code setting mode 2 The factory default calibration security code 1234 will be displayed on primary display 3 Use the editing keys and to step each character...

Страница 141: ...5555 and the secondary dis play shows SECUr 5 Press button for more than 1 second to enter Set Default Security Code mode The secondary display shows SEr no and primary display shows 5555 6 Use the e...

Страница 142: ...is the recommended method to complete a full instrument calibration 1 Read Test Considerations on page 128 2 Perform the verification tests to characterize the instrument incoming data 3 Unsecure the...

Страница 143: ...Instrument for Calibration on page 139 or To Unsecure the Instrument Without the Security Code on page 141 Once unsecured the reference value will be indicated on the primary display Entering Adjustme...

Страница 144: ...ou are connecting test leads to the calibrator and handheld multimeter It is recommended to wait for one minute before you begin the calibration after connecting the test leads 4 During ambient temper...

Страница 145: ...Input Values 5V 50 V 500 V 1000 V 0 9 to 1 1 x Full Scale V for U1251A 5 V 50 V 500 V 1000 V 0 9 to 1 1 x Full Scale for U1252A 5 V 50 V 500 V 1000 V 0 9 to 1 1 x Full Scale 50 mV 500 mV 1000 mV 0 9 t...

Страница 146: ...show the reference value of the Cal Item 4 Configure each Cal Item 5 Use the and arrow keys to select the Cal Range 6 Apply the input signal shown in the Input column of the table The bar graph will...

Страница 147: ...lure is sounded by a long beep and calibration error number appears in the secondary display The primary display remains at the current Cal Item Check the input value range function and entered adjust...

Страница 148: ...V 50V 3 V 1 kHz 03 000 V 03 000 V 30 V 1 kHz 30 000 V 30 000 V 30 V 50 kHz N A 30 000 V 500V 30 V 1 kHz 030 00 V 030 00 V 300 V 1 kHz 300 00 V 300 00 V 300 V 50 kHz N A 300 00 V 1000V 30 V 1 kHz 0030...

Страница 149: ...3 V 1 kHz N A 03 000 V 30 V 1 kHz N A 30 000 V 30 V 50 kHz N A 30 000 V 500 V 30 V 1 kHz N A 030 00 V 300 V 1 kHz N A 300 00 V 300 V 50 kHz N A 300 00 V 1000 V 30 V 1 kHz N A 0030 0 V 300 V 1 kHz N A...

Страница 150: ...0 00 mV 300 mV 50 kHz N A 300 00 mV 1000mV 30 mV 1 kHz 0030 0 mV 0030 0 mV 1000 mV 1 kHz 1000 0 mV 1000 0 mV 1000 mV 50 kHz N A 1000 0 mV 6 Turn the rotary switch to the W position Short Dual Banana P...

Страница 151: ...0 000 nF 100 nF 10 nF 010 00 nF 010 00 nF 100 nF 100 00 nF 100 00 nF 1000 nF 100 nF 0100 0 nF 0100 0 nF 1000 nF 1000 0 nF 1000 0 nF 10 mF 10 mF 10 000 mF 10 000 mF 100 mF 100 mF 100 00 mF 100 00 mF 10...

Страница 152: ...d COM terminal Caution Connect calibrator to hanheld multimeter s A and COM terminal before applying 3A and 10A 5 A 3 A 3 0000 A 3 0000 A 10 A 10 A 10 000 A 10 000 A Move the test lead from A and COM...

Страница 153: ...your instrument read the count to deter mine its initial value The count value increases by one for each calibration point and a complete calibration will increase the value by many counts The calibra...

Страница 154: ...er Recommended Accuracy Requirements 200 Calibration error calibration mode is secured 002 Calibration error secure code invalid 003 Calibration error serial number code invalid 004 Calibration error...

Страница 155: ...ecifications 158 U1251A AC Specifications 160 U1252A AC Specifications 161 U1252A AC DC Specifications 162 Temperature and Capacitance Specifications 163 U1251A U1252A Frequency Specifications 1 164 O...

Страница 156: ...156 Agilent U1251A U1252A User s and Service Guide 8 Specifications...

Страница 157: ...ng the U1251A and U1252A handheld digital multimeter in an environment that is free of electromagnetic interference and electrostatic charge When using the multimeter in an environment where electroma...

Страница 158: ...V Resistance 500 00 3 0 01 1 04 mA 0 08 10 0 05 10 5 0000 k 3 0 0001 k 416 A 0 08 5 0 05 5 50 000 k 0 001 k 41 2 A 500 00 k 0 01 k 4 12 A 5 0000 M 0 0001 M 375 nA 0 2 5 0 15 5 50 000 M 4 0 001 M 187 n...

Страница 159: ...ith open test lead 6 Always use NULL function to zero out thermal effect with open test lead before measuring the signal If NULL function is not used an additional 20 counts needs to be added to the D...

Страница 160: ...ol down for twice the measuring time used before application of low current measurement 5 Input current 3 Arms Function Range Resolution Frequency 30 Hz to 45 Hz 45 Hz to 1 kHz 1 kHz to 10 kHz 10 kHz...

Страница 161: ...or twice the measuring time used before application of low current measurement 6 Input current 3 Arms Function Range Resolution Frequency 20 Hz 45 Hz 45 Hz 1 kHz 1 kHz 10 kHz 10 kHz 20 kHz 20 kHz 100...

Страница 162: ...A leave the meter to cool down for twice the measuring time used before application of low current measurement 6 Input current 3 Arms Function Range Resolution Frequency 30 Hz 45 Hz 45 Hz 1 kHz 1 kHz...

Страница 163: ...the calibrator and meter with external reference without internal ambient compensation If both calibrator and meter are set with internal reference with internal ambient compensation deviation may sho...

Страница 164: ...ximum input for specified accuracy 10 x Range or 1000 V 20 Hz 100 kHz 100 kHz 200 kHz 100 kHz 100 kHz 200 kHz 50 000 mV 10 mV 15 mV 10 mV 15 mV 500 00 mV 25 mV 35 mV 60 mV 70 mV 1000 0 mV 40 mV 50 mV...

Страница 165: ...ndary display 1 Input Range Minimum Sensitivity R M S Sine Wave 20 Hz 20 kHz 500 00 A 100 A 5000 0 A 250 A 50 000 mA 10 mA 440 00 mA 25 mA 5 0000 A 1 A 10 000 A 2 5 A MODE RANGE ACCURACY AT FULL SCALE...

Страница 166: ...er kHz is added to the accuracy Range Resolution Accuracy of reading No of Least Significant Digit Sensitivity Min Input Frequency 9 9999 MHz 0 0001 MHz 0 002 5 20 MHz 400 mV R M S 1 MHz 99 99 MHz 0 0...

Страница 167: ...nd Service Guide 167 Operating Specifications Measuring rate Function Times second ACV 7 ACV dB 7 DCV 7 ACV 7 AC DC V 2 nS 14 Diode 14 Capacitance 4 100 F DCI 7 ACI 7 AC DC I 2 Temperature 6 Frequency...

Страница 168: ...T III 600 V Storage Compliance 40 C to 70 C Safety Compliance EN IEC 61010 1 2001 UL 61010 1 Second Edition and CAN CSA 22 2 61010 1 Second Edition Measurement Category CAT III 1000 V Overvoltage Prot...

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