Instruction/ maintenance manual of the product U1251A Agilent Technologies
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Agilent T echnologies Agilent U1251A and U1252A Handheld Digital Multimeter User’ s and Service Guide.
II Agilent U1251A/ U1252A User’s an d Service Guide Notices © Agilent T echnologies, Inc. 2006 – 2012 N o p a r t o f t h i s m a n u a l m a y b e r e p r o d u c e d i n any form or by any mean.
Agilent U1251A/U 1252A User’s and Service Guide III Safety Symbols The following symbol s on the instrument and i n the docu mentation in dicate precautions which must be taken to maintain safe operation of the instrume nt.
IV Agilent U1251A/U1252A Us er’s and Service Guide Safety Information This meter is safety-certified in compliance with EN/IEC 61010-1:2001, UL 6101 0-1 Second Edition and CAN/CSA 22.2 61010-1 Second Edition, CA T III 1000 V/ CA T IV 600 V Overvoltage Protection, Po llution Degree II.
Agilent U1251A/U 1252A User’s and Service Guide V W ARNING • When working above 7 0 VDC, 33 VAC RMS or 46.7 V peak, exercise caution – such range pose a shock hazard. • Do not measure more th an the rated volt age (as marked on the meter) between terminals, or between te rminal and earth ground.
VI Agilent U1251A/U1252A Us er’s and Service Guide CAUTION • T urn off the circuit power and discharge all hi gh- volta ge capacitors in th e circuit be fore you perform resistance, continuity , diodes, or capacitance tests. • Use the correct termi nals, function, and range for your measureme nts.
Agilent U1251A/U 1252A User’s and Service Guide VII Regulatory Markings The CE mark is a registered trademark of the European Community. This CE mark shows that the product compl ies with all the re levant Europ ean Legal Directives. The C-tick mark is a regi stered trademar k of the Sp ectrum Management Agency of Australia.
VIII Agilent U1251A /U1252A User’s and Service Guide W aste Electrical and Electronic Equipment (WEEE) Directive 2002/96/EC This instrument complies with the WEEE Directive (2002/96/EC) marking requirement. This af fixed produ ct label indicate s that you must not discard this electrical/ele ctronic produc t in domestic household waste.
Agilent U1251A/U 1252A User’s and Service Guide IX In This Guide… 1G e t t i n g S t a r t e d This chapter contains information on the Agilent U1251A and U1252A handheld multimete r front panel, rotar y switch, keypad, disp lay , ter minals and rear panel.
X Agilent U1251A/U1252A Us er’s and Service Guide Declaration of Conformity (DoC) The Declaration of C onformity (DoC) for this instrument is available on the W e b site. Y ou can search the DoC by its product model or description. http://regulations.
III Abbreviated Book Title Variab le (Edit this) XIII Contents 1 Getting Started Introducing the U12521A/U1252A Handheld Digital Multimeter 2 Check the shipment 3 Adjusting the tilt-stand 4 The rear p.
XIV Abbreviated Book Title Variab le (Edit this) III Overload alert 47 Input warning 47 Charge terminal alert 48 3 Functions and Features Dynamic Recording 50 Data Hold (T rigger Hold) 52 Refresh Hold.
III Abbreviated Book Title Variab le (Edit this) XV Setting Beep Frequency 87 Setting Backlight Timer 88 Setting Baud Rate 89 Setting Pari ty Check 90 Setting Data Bit 91 Setting Echo Mode 92 Setting .
XVI Abbreviated Book Title Variab le (Edit this) III T esting the display 115 Current terminal test 116 Charge terminal alert test 117 T est Considerations 118 Calibration Security 119 Performance V e.
III Abbreviated Book Title Variab le (Edit this) XVII Peak Hold Specifications 159 Frequency Counter Spec ifications for U1252A 160 Square W ave Output for U1252A 161 Operating Specifications 162 Disp.
XVIII Abbreviated Book Title Variab le (Edit this) III.
Abbreviated Book Title Variab le (Edit this) IX List of Figures Figure 1-1 Tilt-stand at 60° 4 Figure 1-2 Tilt-stand at 30° 4 Figure 1-3 Tilt-stand at hanging position 5 Figure 1-4 U1252A front pane.
X Abbreviated Book Title Variab le (Edit this) Figure 3-8 Full Log 62 Figure 3-9 Interval (Automatic) logging mode operation 64 Figure 3-10 Log review mode operation 66 Figure 3-11 Frequency adjustmen.
II Abbreviated Book Title Variab le (Edit this) XI List of T ables Ta b l e 1 - 1 Rotary switch description and functions 8 Ta b l e 1 - 2 Keypad desciption and functions 9 Ta b l e 1 - 3 General disp.
XII Abbreviated Book Title Variab le (Edit this) II Ta b l e 7 - 7 U1252A true RMS ac+dc current specifications 155 Ta b l e 7 - 8 Capacitance specifications 156 Ta b l e 7 - 9 Temperature specificati.
1 Agilent T echnologies Agilent U1251A and U1252A Ha ndheld Digital Multimeter User’s and Service Guide 1 Getting Started Introducing the U12521A/U1252A Hand held Digital Multimeter 2 Check the ship.
2 Agilent U1251A/U1252 A User’s and Service Guide 1 Getting Start ed Tutorial Introducing the U12521A/U1252A Handheld Digital Multimeter K ey features of this dig it al multimet er: • DC, A C, and A C + DC (U1252A only) v olt age and cur rent measurements.
Getting Started Tutorial 1 Agilent U125 1A/U1252A User ’s and Service Guide 3 Check the shipment V erify that you ha ve receiv ed the follo wing items with your multimeter : • 9 V alkaline batter .
4 Agilent U1251A/U1252 A User’s and Service Guide 1 Getting Start ed Tutorial Adjusting the tilt-stand T o adj ust the meter to a 60 ° standin g position, pull t he tilt- stand outwards to its maximum reach.
Getting Started Tutorial 1 Agilent U125 1A/U1252A User ’s and Service Guide 5 T o ad just the m eter to a h ang ing p osit ion fo llo w the ste ps sho wn in Figu re 1- 3 below . Figure 1-3 Ti lt-stand at hanging position 3. Flip the tilt-stand over until this sid e of the stand is facing the device instea d of facing you.
6 Agilent U1251A/U1252 A User’s and Service Guide 1 Getting Start ed Tutorial The front panel at a glance Figure 1-4 U1252A front panel Display Keypad Rotary switch Te r m i n a l Connectors.
Getting Started Tutorial 1 Agilent U125 1A/U1252A User ’s and Service Guide 7 The rear panel at a glance Figure 1-5 Rear panel IR communication port Battery access cover Te s t p r o b e holders Til.
8 Agilent U1251A/U1252 A User’s and Service Guide 1 Getting Start ed Tutorial The rotary switch at a glance Figure 1-6 Rotary swi tch Ta b l e 1 - 1 Rotary swi tch descrip tion and f unctions No.
Getting Started Tutorial 1 Agilent U125 1A/U1252A User ’s and Service Guide 9 The keypad at a glance The operation of each ke y is sho w n belo w . Pressin g a k ey illuminates a related symbol on t he display and em its a beep fr om the multi meter .
10 Agilent U1251A/U1252A Us er’s and Service Guide 1 Getting Start ed Tutorial Button Function when pressed for less than 1 second Function when pressed for more than 1 second 4 scrolls through the measurin g function(s) at a particular rotary switch positi on.
Getting Started Tutorial 1 Agilent U125 1A/U1252A User ’s and Service Guide 11 The display at a glance T o view the full display (wit h all segments illuminated), press and hold the button while turning t he rotar y switch from OFF to any non- OFF posi tion.
12 Agilent U1251A/U1252A Us er’s and Service Guide 1 Getting Start ed Tutorial Ta b l e 1 - 3 General display symbols LCD symbol Description Remote control Thermocouple types: (K-type) (J-type) NULL.
Getting Started Tutorial 1 Agilent U125 1A/U1252A User ’s and Service Guide 13 The primar y display signs are explained belo w . Ta b l e 1 - 4 Priamry display symbols LCD symbol Description Auto ra.
14 Agilent U1251A/U1252A Us er’s and Service Guide 1 Getting Start ed Tutorial The secondar y display signs are explained belo w . The analog bar emulates the need le on an analog multimeter , without dis playing the o vershoot.
Getting Started Tutorial 1 Agilent U125 1A/U1252A User ’s and Service Guide 15 The “+” or “–” sign is indicated when the positive or negative value has been measured or calc ulated. Each segment represents 2500 or 50 0 counts depending on t he range indicat ed on t he peak b ar g raph.
16 Agilent U1251A/U1252A Us er’s and Service Guide 1 Getting Start ed Tutorial Selecting display with the Hz button The frequency measureme nt fe ature helps to det ect the presence of harm onic cur rents in neutral conduct ors and deter mines whet her the se neutral curre nts are the result of unbalanced phases or non- linear loads.
Getting Started Tutorial 1 Agilent U125 1A/U1252A User ’s and Service Guide 17 (AC + DC voltage) [for U1252A] Frequency (Hz) AC + DC mV Pulse width (ms) Duty cycle (%) (AC Current) Frequency (Hz) AC.
18 Agilent U1251A/U1252A Us er’s and Service Guide 1 Getting Start ed Tutorial Selecting display with the Dual button Press to select dif ferent combinations of dual display. Normal sing le display resumes after you press and hold f or more than 1 second.
Getting Started Tutorial 1 Agilent U125 1A/U1252A User ’s and Service Guide 19 (AC + DC voltag e) AC + DC mV Hz (AC coupling) dBm or dBV AC + DC mV AC + DC mV AC mV AC + DC mV DC mV AC + DC mV Ambie.
20 Agilent U1251A/U1252A Us er’s and Service Guide 1 Getting Start ed Tutorial Selection display with the Shift button The table below sho ws selection of primar y display , wit h respect to measuring function (r otar y switch position), using the SHIFT butt on.
Getting Started Tutorial 1 Agilent U125 1A/U1252A User ’s and Service Guide 21 for U1252A (AC + DC V oltage) DC mV AC mV AC + DC mV Ω (Resistance) Ω Ω nS (Diode T est and Frequency) Diode Hz / TE.
22 Agilent U1251A/U1252A Us er’s and Service Guide 1 Getting Start ed Tutorial The terminals at a glance Figure 1-9 U1252A connector terminals W ARNING T o avoid damaging the multimeter , do not exceed the input limit.
23 Agilent T echnologies Agilent U1251A and U1252A Ha ndheld Digital Multimeter User’s and Service Guide 2 Making Measurements Understanding The Measu rement Instructions 24 Measurin g V oltage 24 M.
24 Agilent U1251A/U1252A Us er’s and Service Guide 2 Making Measurements Understanding The Measurement Instructions When making measurements, f ollow the numerical steps labelled in the diag rams. Refer to Table 2- 1 belo w for a description of the steps.
Making Measurements 2 Agilent U1251A/U 1252A User’s and Service Guide 25 Measuring AC voltage Set up the multimeter t o measure A C voltage as sho wn in Fig ure 2- 1 . Pr obe the te st poi nts and re ad the d ispl a y. Figure 2-1 Measurin g AC v oltage Red Lead Black Lead NOTE Press to display frequency on secondary displa y .
26 Agilent U1251A/U1252A Us er’s and Service Guide 2 Making Measurements Measuring DC voltage Set up the multimeter to measure DC v olt age as sho wn in Fig ure 2- 2 .
Making Measurements 2 Agilent U1251A/U 1252A User’s and Service Guide 27 Measuring Current µA & mA measurement Set up the multim eter to measure μ A & mA as sho wn in Fig ure 2- 3 . Pr obe the te st poi nts and re ad the d ispl a y. NOTE • Press if necessary to ensure is shown on the display.
28 Agilent U1251A/U1252A Us er’s and Service Guide 2 Making Measurements Figure 2-3 Measuring μ A and mA current Red Lead Black Lead.
Making Measurements 2 Agilent U1251A/U 1252A User’s and Service Guide 29 Percentage scale of 4 mA to 20 mA Set up the multimeter to measure per centage scale as sho wn in Fig ure 2- 4 .
30 Agilent U1251A/U1252A Us er’s and Service Guide 2 Making Measurements Figure 2-4 Measuring scale of 4-20 mA Red Lead Black Lead.
Making Measurements 2 Agilent U1251A/U 1252A User’s and Service Guide 31 A (ampere) measurement Set up the multimet er to measure A (ampere) as sho wn in Fig ure 2- 5 .
32 Agilent U1251A/U1252A Us er’s and Service Guide 2 Making Measurements Frequency Counter Set up t he multimet er to measure freque ncy as shown in Fig ure 2- 6 . Pr obe the te st poi nts and re ad the d ispl a y. W ARNING • Use the frequency counter for low vo ltage applications onl y .
Making Measurements 2 Agilent U1251A/U 1252A User’s and Service Guide 33 Figure 2-6 Measuring frequency Hz Red Lead Black Lead.
34 Agilent U1251A/U1252A Us er’s and Service Guide 2 Making Measurements Measuring Resistance, Conductance and T esting Continuity Set up the multimeter t o measure resistance as shown in Fig ure 2- 7 . Then probe the test points (by shunting the resistor) and read t he displa y.
Making Measurements 2 Agilent U1251A/U 1252A User’s and Service Guide 35 Press t o scroll through audible continuity , conductance and resistance t ests as sho wn in Table 2- 8 .
36 Agilent U1251A/U1252A Us er’s and Service Guide 2 Making Measurements Audible contin uity In the range of 0–500 Ω , the beeper will sound if the resistance value falls below 10 Ω . F or ot her ranges, t he beeper will sound if t he resi st ance falls belo w t he typical values indicated in Table 2- 3 belo w .
Making Measurements 2 Agilent U1251A/U 1252A User’s and Service Guide 37 Figure 2-9 Conducta nce measure ment Ω nS Red Lead Black Lead MAX.
38 Agilent U1251A/U1252A Us er’s and Service Guide 2 Making Measurements Te s t i n g D i o d e s T o tes t a di ode, tu rn the po we r o ff to th e cir cui t an d rem o ve the diode from t he circuit.
Making Measurements 2 Agilent U1251A/U 1252A User’s and Service Guide 39 Figure 2-10 Measuring forward bias of diode Red Lead Black Lead Hz.
40 Agilent U1251A/U1252A Us er’s and Service Guide 2 Making Measurements Figure 2-11 Measuring revers e bias of diode Red Lead Black Lead Hz.
Making Measurements 2 Agilent U1251A/U 1252A User’s and Service Guide 41 Measuring Capacitance The meter measures capaci tanc e by charging the capacit or with a known current f or a period of time, measuring the v oltage and then calculating the capacitance.
42 Agilent U1251A/U1252A Us er’s and Service Guide 2 Making Measurements Figure 2-12 Capacitance measurements Red Lead Black Lead TEMP.
Making Measurements 2 Agilent U1251A/U 1252A User’s and Service Guide 43 Measuring T emperature The bead type thermocouple probe is suitable for making temperature measurements betw een –20 °C to 200 °C in PTFE compatible envir onments. Do not use the bead- type t hermocouple probe be yond the recommended operating temperature range .
44 Agilent U1251A/U1252A Us er’s and Service Guide 2 Making Measurements 8 F or a quick measurement, use the 0 °C compe nsation adapter to see t he temperature variation of the thermocouple sensor . The 0 °C compensation adapter assists in measuring the relative temperature immediately.
Making Measurements 2 Agilent U1251A/U 1252A User’s and Service Guide 45 If y ou are w orking in a const antly var ying environment, where ambient t emperatures are not constant, do t he fo l l owi n g: 1 Press to select 0 °C compensation. This giv e s a quick measurement of the relativ e t emperature.
46 Agilent U1251A/U1252A Us er’s and Service Guide 2 Making Measurements Figure 2-15 Surface temperature measurement TEMP.
Making Measurements 2 Agilent U1251A/U 1252A User’s and Service Guide 47 Alerts and W arning During Measurement Overload alert The meter pro vides an ov erload aler t for v oltage measurements in both auto and manual range modes. The meter beeps periodically once the measuring voltage exceeds 1010 V .
48 Agilent U1251A/U1252A Us er’s and Service Guide 2 Making Measurements Charge terminal alert The meter sounds an aler t beep when t he termina l detects a voltage lev el of more than 5 V and the rotar y switch is not set t o the cor responding location.
49 Agilent T echnologies Agilent U1251A and U1252A Ha ndheld Digital Multimeter User’s and Service Guide 3 Functions and Features Dynamic Recording 50 Data Hold (T rigger Hold) 52 Refresh Hold 53 Nu.
50 Agilent U1251A/U1252A Us er’s and Service Guide 3 Features and Functions Dynamic Recording The Dynamic Recor d ing mode can be used to detect inter mittent tur n- on or turn- of f voltage, current sur ges or to verify mea surement per f ormance without you being present during th e process.
Features and Functions 3 Agilent U1251A/U 1252A User’s and Service Guide 51 Figure 3-1 Dynamic recording mode operation Press Max Min for > 1 sec or press for > 1 sec Press Max Min for > 1 .
52 Agilent U1251A/U1252A Us er’s and Service Guide 3 Features and Functions Data Hold (T rigger Hold) The data ho ld fu nctio n all ow s the u ser to fre eze th e display ed digit al value. 1 Press to freeze th e display ed valu e and to ent er th e manual trigger mode.
Features and Functions 3 Agilent U1251A/U 1252A User’s and Service Guide 53 Refresh Hold The Refresh Hold function allo ws you to fre eze the disp la ye d value. The bar - g raph is not held and will continue to ref lect the inst ant aneous measured value.
54 Agilent U1251A/U1252A Us er’s and Service Guide 3 Features and Functions Figure 3-3 Refresh hold mode operat ion The HOLD sign flashes until the measured value is stable and updated Press V ariat.
Features and Functions 3 Agilent U1251A/U 1252A User’s and Service Guide 55 Null (Relative) The Null function subtracts a stored value from the present measurement and displays the dif ference between the two.
56 Agilent U1251A/U1252A Us er’s and Service Guide 3 Features and Functions Figure 3-4 Null (relative) mode operati on Press Press Press.
Features and Functions 3 Agilent U1251A/U 1252A User’s and Service Guide 57 Decibel Display The dBm operatio n calculate s th e pow er delivered to a reference resistance relative to 1 mW and can be applied to D C V , A C V , a n d A C + D C V m e a s u r e m e n t s f o r d e c i b e l conversion.
58 Agilent U1251A/U1252A Us er’s and Service Guide 3 Features and Functions Figure 3-5 dBm/dBV display mode operation Press Press Press Press Press Press Pres s Press Press Press.
Features and Functions 3 Agilent U1251A/U 1252A User’s and Service Guide 59 1 ms Peak Hold The P eak Hold function allo ws the measurement of peak v oltage for analysis of components such as po wer distribution transformers and pow er fact or correction capacitors.
60 Agilent U1251A/U1252A Us er’s and Service Guide 3 Features and Functions Figure 3-6 1 ms peak hold mode operation Press Press Press Press Press Press.
Features and Functions 3 Agilent U1251A/U 1252A User’s and Service Guide 61 Data Logging The data logging function pro vides the convenience of recording test data for future revie w or analysis. Since data is stored in nonvolatile memor y , t he dat a remains sav ed even if the multimeter is tur ned OFF or the batt er y is changed.
62 Agilent U1251A/U1252A Us er’s and Service Guide 3 Features and Functions Figure 3-7 Hand (Manual) logging mode operation Figure 3-8 Full Log Press Press NOTE The maximum data that ca n be stored is 100 entries. When the 100 entrie s are filled, the secon dary display in dicates “ FULL ”, as shown in Figure 3-8 .
Features and Functions 3 Agilent U1251A/U 1252A User’s and Service Guide 63 Interval logging Firstly , ensure t hat inte rval (time) logg ing is specif ied in Setup mode. 1 Press f or more than 1 second to store t he present value and func tion on the primar y displa y int o the non- v olatile memor y .
64 Agilent U1251A/U1252A Us er’s and Service Guide 3 Features and Functions Figure 3-9 Interval (Autom atic) logging mode operation Press Press Press.
Features and Functions 3 Agilent U1251A/U 1252A User’s and Service Guide 65 Reviewing logged data 1 Press for more than 1 second to ente r the Log Review mode. The last recor ded en tr y and the last logging index are dis pla yed . 2 Press to switch between hand (manual) and interval (automatic ) logging review mode.
66 Agilent U1251A/U1252A Us er’s and Service Guide 3 Features and Functions Figure 3-10 Log review mode operation Press Press Press Press Press Press Press Press Press Press Pres s Press Press Press.
Features and Functions 3 Agilent U1251A/U 1252A User’s and Service Guide 67 Square W ave Output (for U1252A) The square wav e output function can be used to generat e a PWM (pulse width modulation) output or provide a synchro- nous clock sour ce (baud rate generator).
68 Agilent U1251A/U1252A Us er’s and Service Guide 3 Features and Functions Figure 3-11 Frequency adjustment for square wave output 5 Press t o select the pulse width (ms) on the primar y display. 6 Press or to adjust the pulse width. The pulse width can be set for 256 steps and each step is 1/ (256 x Frequency).
Features and Functions 3 Agilent U1251A/U 1252A User’s and Service Guide 69 Figure 3-12 Pulse width adjustment for square wave output Press Press Press Press Press Press Press Press.
70 Agilent U1251A/U1252A Us er’s and Service Guide 3 Features and Functions Figure 3-13 Duty cycle adjustment for Square W ave.
Features and Functions 3 Agilent U1251A/U 1252A User’s and Service Guide 71 Remote Communication The meter has a bi- directional (full duplex) communication ca pab ilit y tha t spee ds data stor ing fr om th e me ter to the PC.
72 Agilent U1251A/U1252A Us er’s and Service Guide 3 Features and Functions.
73 Agilent T echnologies Agilent U1251A and U1252A Ha ndheld Digital Multimeter User’s and Service Guide 4 Changing The Default Setting Selecting Setup Mode 74 Setting Data Logging Mode 78 Setting T.
74 Agilent U1251A/U1252A Us er’s and Service Guide 4 Changing The Default Setting Selecting Setup Mode T o ent er t he Setup mode , per form th e follo wing st eps: 1 Turn the meter OFF . 2 From the OFF position, press and hold while turning t he rotar y swit ch to any non- OFF position.
Changing The Default Setting 4 Agilent U1251A/U1252A User’s and Service Guide 75 T able 4-1 A v ailable settin g options in S etup mode Menu Item Available s etting options Default factor y setting .
76 Agilent U1251A/U1252A Us er’s and Service Guide 4 Changing The Default Setting t.CoUP [ 3 ] Thermocouple tYPE K Sets the thermocouple type to K-type tYPE K tYPE J Sets the thermocouple type to J-.
Changing The Default Setting 4 Agilent U1251A/U1252A User’s and Service Guide 77 Setting Data Hold/Refresh Hold Mode 1. Set OFF to en able the Dat a Hold mode (manual tr igger by k ey o r b us v ia the remo te co ntr ol). 2. Set the variation count wit hin the 100 to 1000 range to enable th e Refresh Hold mode (au to trigger).
78 Agilent U1251A/U1252A Us er’s and Service Guide 4 Changing The Default Setting Setting Data Logging Mode 1 Set to “Hand” t o enable the manual dat a logging mode. 2 Set the inte rval within 0001 to 9999 seconds to enable interval (automatic) dat a logging mode.
Changing The Default Setting 4 Agilent U1251A/U1252A User’s and Service Guide 79 Setting Thermocouple T ypes (U1252A only) The ther mocouple sensor types t hat can be selected ar e type- K (default) or type- J. Press or to switch betw een the J and the K type.
80 Agilent U1251A/U1252A Us er’s and Service Guide 4 Changing The Default Setting Setting Reference Impedance for dBm Measurement The reference im pedance ca n be set from 1 to 9999 W .
Changing The Default Setting 4 Agilent U1251A/U1252A User’s and Service Guide 81 Setting Minimum Frequency Measurement The minimum fre quency setup inf luences the measuring rates for frequency , duty cycle, an d pulse width. The typical measuring rate defined at t he general specification is based on the minimum fre quency of 1 Hz.
82 Agilent U1251A/U1252A Us er’s and Service Guide 4 Changing The Default Setting Setting T emperature Unit F our combination displays are a vailable: • Celsius only ( ° C on primary display) single display setting • Celsius- Fahrenheit (d- CF) an d F a h r e n h e i t -C e l s i u s ( d -F C ) dual display setting.
Changing The Default Setting 4 Agilent U1251A/U1252A User’s and Service Guide 83 Figure 4-6 T emp erature u nit setup Press Press Press Press Press.
84 Agilent U1251A/U1252A Us er’s and Service Guide 4 Changing The Default Setting Setting Auto Power Saving Mode • The timer f or APF (Auto P ow er OFF) can be set for the range of 1 to 99 minutes. • T o act ivate the met er a f ter i t has “a uto p ow ered- off”, t urn the ro t ary swi t ch to the OFF p ositi on.
Changing The Default Setting 4 Agilent U1251A/U1252A User’s and Service Guide 85 Figure 4-7 Auto power saving set up Press Press Press Press Press.
86 Agilent U1251A/U1252A Us er’s and Service Guide 4 Changing The Default Setting Setting Percentage (%) Scale Readout This setting converts the DC cur rent measuring display to percentage (%) scale readout — 4—20 mA or 0—20 mA as proportional to 0~100%.
Changing The Default Setting 4 Agilent U1251A/U1252A User’s and Service Guide 87 Setting Beep Frequency The driving frequency can be set to 2400, 1200, 600, or 300Hz.
88 Agilent U1251A/U1252A Us er’s and Service Guide 4 Changing The Default Setting Setting Backlight T imer • The timer can be set to 1 to 99 seconds. The backlight will turn of f automatically aft er the set period. • “0FF” disables turning of f backlit automatically.
Changing The Default Setting 4 Agilent U1251A/U1252A User’s and Service Guide 89 Setting Baud Rate Select the baud rate for remote control. The a vailable settings are 2400, 4800, 9600, and 19200 Hz.
90 Agilent U1251A/U1252A Us er’s and Service Guide 4 Changing The Default Setting Setting Parity Check Select the parity check for remote contr ol. It can be set to none, even, or odd bit.
Changing The Default Setting 4 Agilent U1251A/U1252A User’s and Service Guide 91 Setting Data Bit Select the dat a bit for remote control. It can be set to eit her 8 or 7 bits.
92 Agilent U1251A/U1252A Us er’s and Service Guide 4 Changing The Default Setting Setting Echo Mode • Ec ho O N enab les th e ret urn o f cha racter s to the PC in remote communication. • Ec ho O FF di sable s the r eturn o f cha racter s to the PC.
Changing The Default Setting 4 Agilent U1251A/U1252A User’s and Service Guide 93 Setting Print Mode Print ON enables the printing of measured data t o the PC when the measuri ng cycle is completed. In t his mode , the meter auto matically sends the newest data t o the host continuously but does not accept an y commands from the host.
94 Agilent U1251A/U1252A Us er’s and Service Guide 4 Changing The Default Setting Returning to Default Factory Settings • Press fo r more than 1 second t o reset to t he default factor y settings all menu options ex cept the T emperature setting.
95 Agilent T echnologies Agilent U1251A and U1252A Ha ndheld Digital Multimeter User’s and Service Guide 5 Maintenance Introduction 96 General mainte nance 96 Battery replacement 96 Storage consid e.
96 Agilent U1251A/U1252A User’s an d Service Guide 5 Maintenance Introduction General maintenance Bes ides the a bo v e ha zard , dirt, or mo istu re in th e term ina ls can distor t readings. The steps for cleaning are as f ollows: 1 Turn the meter off and remo v e th e tes t lea ds.
Maintenance 5 Agilent U1251A/U 1252A User’s and Service Guide 97 Figure 5-1 9 V rectangular battery 1 At the rear panel, turn t he screw on the batt er y cover from the LOCK to t he OPEN position (counterclockwise). 2 Slide down the batter y c o ver .
98 Agilent U1251A/U1252A User’s an d Service Guide 5 Maintenance Storage considerations Aft er the f irst charge, it is recommended that you fully charge the batter y periodically , ev en when it is not in use. This is because the Ni- MH rechargeable batter y pack may drain with time.
Maintenance 5 Agilent U1251A/U 1252A User’s and Service Guide 99 Use the sp ecifie d 2 4 V DC ada ptor to char ge th e batt er y. Rem embe r ne ve r to tu rn the r otar y s wi tch o f the m eter when the batt er y is being charged. Use t he follo win g steps t o charge the battery: 1 Di sco nnec t the test leads fro m the mete r .
100 Agilent U1251A/U1252A User’s an d Service Guide 5 Maintenance Figure 5-2 Battery capacit y display a s trickle 5 Aft er pressing Shif t or when t he self- test st ar ts, t he mete r performs a self- test to check if the batter y in t he meter is the rechargeable type.
Maintenance 5 Agilent U1251A/U 1252A User’s and Service Guide 101 Ta b l e 5 - 2 Error messages Error Error message OL 1 No battery inside 2 Faulty battery 3 Battery is fully charged C-Err 1 If char.
102 Agilent U1251A/U1252A User’s an d Service Guide 5 Maintenance 6 The smar t charging mode will star t if t he meter passes the self- test. The charging ti m e is limited to not more than 220 minutes. The secondar y display will count do wn the charging time.
Maintenance 5 Agilent U1251A/U 1252A User’s and Service Guide 103 7 The charge end message (C–End) appears on the secondar y display once charging is completed. The trickle charging current is provided to maintain t he batter y capacity. The f las hing sig ns of and appear to sho w t he trickle st ate.
104 Agilent U1251A/U1252A User’s an d Service Guide 5 Maintenance Figure 5-6 Battery charging procedure Press.
Maintenance 5 Agilent U1251A/U 1252A User’s and Service Guide 105 Fuse checking procedure It is recommended t hat you check the fuses of the multimeter before using it. Follo w th e instr uctions below to test t he fuses inside t he multimeter . Refer to Figure 5- 8 for the respective positions of F use 1 and F use 2.
106 Agilent U1251A/U1252A User’s an d Service Guide 5 Maintenance 4 T o tes t Fuse 2 , pla ce and touch the ti p of the tes t pr obe on the r ight hal f of i npu t termi nal . En sure that the pr obe t ip touc hes the metal in sid e the in put termi nal .
Maintenance 5 Agilent U1251A/U 1252A User’s and Service Guide 107 6 Gently remov e t he defective fuse by pryi ng one end of t he fuse loose and removing it out of the fuse brack et. 7 Replace with a new fuse of the same size and rating. Make sure the new fuse is cent ered in the fuse holder .
108 Agilent U1251A/U1252A User’s an d Service Guide 5 Maintenance T roubleshooting If the instr ument f ails to operat e, check t he batt er y and t he test leads. Replace t hem if necessar y. And if t he instru ment still does not function, check the operating procedures in this manu al.
Maintenance 5 Agilent U1251A/U 1252A User’s and Service Guide 109 Replaceable Parts This section contains informat ion for or dering replacement parts for your instrument. you can find the instr ument suppor t part list at A gilent’s Test & Measurement P ar ts Catalog at: http://www .
110 Agilent U1251A/U1252A User’s an d Service Guide 5 Maintenance.
111 Agilent T echnologies Agilent U1251A and U1252A Ha ndheld Digital Multimeter User’s and Service Guide 6 Performance T ests and Calibration Calibration Overview 11 2 Closed-case elect ronic calib.
112 Agilent U1251A/U1252A Us er’s an d Service Guide 7 Performance Tests and Calibration Calibration Overview This manual contains procedures to verify the instr ument’s performance and adjustment (calibration).
Performance Tests and Calib ration 7 Agilent U1251A/U 1252A User’s and Service Guide 113 Calibration interval A 1- year interval is adequate for most applications. A ccuracy specifications are war ranted on ly if adjustme nt is made at regular calibration int ervals.
114 Agilent U1251A/U1252A Us er’s an d Service Guide 7 Performance Tests and Calibration Recommended T est Equipment The test equipment recomm ended for the per formance v e r i f i c a t i o n a n d a d j u s t m e n t p r o c e d u r e s i s l i s t e d b e l o w .
Performance Tests and Calib ration 7 Agilent U1251A/U 1252A User’s and Service Guide 115 Basic Operating T est The Basic Operating Test is to test t he basic operability of the instr ume nt. Repair is required if t he instr ument fails t he Basic Operating T est.
116 Agilent U1251A/U1252A Us er’s an d Service Guide 7 Performance Tests and Calibration Current terminal test This test dete rmines if the input warning of the cur rent termi nal tes t is fu ncti oning prop erl y. The meter sounds an aler t beep when the test lead is inser ted int o t he A ter minal but t he rot ar y swit ch is not set to mA.
Performance Tests and Calib ration 7 Agilent U1251A/U 1252A User’s and Service Guide 117 Charge terminal alert test This test det erm ines if t he charge t erminal ale r t is operating properly. The meter sounds an aler t when the terminal detects a voltage lev el of more than 5 V and the rotar y switch is not set t o the position.
118 Agilent U1251A/U1252A Us er’s an d Service Guide 7 Performance Tests and Calibration T est Considerations Long test leads can also act as antennas which may pick up A C signals.
Performance Tests and Calib ration 7 Agilent U1251A/U 1252A User’s and Service Guide 119 Calibration Security The calibration security code prevents accidental or unauthorized adjustments t o the instr ument. When you first receiv e your instrument, it is secu red.
120 Agilent U1251A/U1252A Us er’s an d Service Guide 7 Performance Tests and Calibration Performance V erification T ests Us e th e P er f orman ce V erific ati on T ests to v er ify th e measurement performance of th e instrument. The performance verif ication tests use t he instrumen t’s specifications listed in t he U1251A/U1252A Data Sheet.
Performance Tests and Calib ration 7 Agilent U1251A/U 1252A User’s and Service Guide 121 Ta b l e 6 - 2 Performance ve rification test steps Step Te s t F u n c t i o n Range 5520A Output Error from nominal 1 year U1251A U1252A 1 T urn the rotar y switch to th e V position [ 1 ] 5 V 5 V , 1 kHz ± 32.
122 Agilent U1251A/U1252A Us er’s an d Service Guide 7 Performance Tests and Calibration Step Te s t F u n c t i o n Range 5520A Output Error from nominal 1 year U1251A U1252A 4 T urn the rotary switch to V position (for model U1252A), to V position (for model U12 51 A) 5 V 5 V ± 2 mV ± 1.
Performance Tests and Calib ration 7 Agilent U1251A/U 1252A User’s and Service Guide 123 Step T est Function Range 5520A Output Error from nominal 1 year U1251A U1252A 6 T urn the rot ary switch to the mV position 50 mV 50 mV ± 75 μ V [ 2 ] ± 75 μ V [ 2 ] 500 mV 500 mV ± 0.
124 Agilent U1251A/U1252A Us er’s an d Service Guide 7 Performance Tests and Calibration Step T est Function Range 5520A Output Error from nominal 1 year U1251A U1252A 8 T urn the rot ary switch to the W position 500 W 500 W ± 500 m W [ 3 ] ± 350 m W [ 3 ] 5 k W 5 k W ± 4.
Performance Tests and Calib ration 7 Agilent U1251A/U 1252A User’s and Service Guide 125 Step T est Function Range 5520A Output Error from nominal 1 year U1251A U1252A 100.00 μ F 100 .00 μ F ± 1.05 μ F ± 1.05 μ F 1000.0 μ F 100 0.0 μ F± 1 0 .
126 Agilent U1251A/U1252A Us er’s an d Service Guide 7 Performance Tests and Calibration Notes for verificati on test: 1 The additional error to be added as fr equency > 20 kHz and sign al input < 10 % of range: 300 counts of LSD per kHz. 2 The accuracy could be 0.
Performance Tests and Calib ration 7 Agilent U1251A/U 1252A User’s and Service Guide 127 11 The current can be measuring from 2.5 A to 10 A continuous, and the a dditional of 0.5% to spec ified accuracy as me asure the signal greater than 10 A~20 A for 30 seconds maximum.
128 Agilent U1251A/U1252A Us er’s an d Service Guide 7 Performance Tests and Calibration Unsecuring the instrument for calibration Bef ore y ou can adjust the instr ument, you must unsecure it by entering the cor rect security code. The security code is set to 1234 when the instr ument is shipped from the factor y.
Performance Tests and Calib ration 7 Agilent U1251A/U 1252A User’s and Service Guide 129 T o change the instrument calibrat ion security code from the front panel 1 When th e multimet er is in t he unse cured mode, pre ss f or mo re tha n 1 secon d to en ter the Calib rati on Security Code setting mode.
130 Agilent U1251A/U1252A Us er’s an d Service Guide 7 Performance Tests and Calibration T o unsecure the instrument without the security code T o unsecure t he instr ument without the cor rect security code, f ollo w t he steps below . 1 Record the last 4 digits of t he multi meter’s serial nu mber .
Performance Tests and Calib ration 7 Agilent U1251A/U 1252A User’s and Service Guide 131 No w you can use 1234 as the security code. If y ou want to enter a new security code, see “T o change the instr ument calibration security c ode from the front panel” on page 129.
132 Agilent U1251A/U1252A Us er’s an d Service Guide 7 Performance Tests and Calibration Using the front panel for adjustments This section describes t he procedures to per form adjustments from the front panel.
Performance Tests and Calib ration 7 Agilent U1251A/U 1252A User’s and Service Guide 133 Adjustments Consideration Y ou will need a test input ca ble, a connectors set, and a Shorting Plug to adjust t he instrument. A djustments f or each functi on should b e performed onl y in the o rd er sh ow n belo w .
134 Agilent U1251A/U1252A Us er’s an d Service Guide 7 Performance Tests and Calibration V alid adjustment input values Adjustment can be accomplished using the follo wing input values belo w . Ta b l e 6 - 3 V alid adjustment input values Function Range V alid Amplitude Input V alues 5 V , 50 V , 500 V , 100 0 V 0.
Performance Tests and Calib ration 7 Agilent U1251A/U 1252A User’s and Service Guide 135 Adjustment procedure Review the sections “Test Considerations” on page 118 and “Adjustments Consideration” on page 133 bef ore proceeding with t his procedure.
136 Agilent U1251A/U1252A Us er’s an d Service Guide 7 Performance Tests and Calibration 8 Press t o st ar t the adjustment. The CAL f lashes in the s econ dary di spla y to i nd ica te that th e cal ibr ation is in progress. F or an adjustment t hat is successful, the secondar y displa y will brief ly sho w P ASS.
Performance Tests and Calib ration 7 Agilent U1251A/U 1252A User’s and Service Guide 137 Ta b l e 6 - 4 Adjustment table Step T est Function Cal Range Input Cal Item U1251A U1252A 1 T urn the rot ary switch to the V positi on 5 V 0.3 V ,1 kHz 0.3000 V 0.
138 Agilent U1251A/U1252A Us er’s an d Service Guide 7 Performance Tests and Calibration Step T est Function Cal Range Input Cal Item U1251A U125 2A 3 Press button to go to the V mode 5 V 0.3 V , 1 kHz N/A 0.3000 V 3 V , 1 kHz N/A 3.0000 V 3 V , 50 kHz N/A 3.
Performance Tests and Calib ration 7 Agilent U1251A/U 1252A User’s and Service Guide 139 Step Te s t F u n c t i o n Cal Range Inpu t Cal Item U1251A U1252A 5 Press button to go to the mV mode 50 mV 3 mV , 1 kHz 03.00 0 mV 03.000 mV 30 mV , 1 kHz 30.
140 Agilent U1251A/U1252A Us er’s an d Service Guide 7 Performance Tests and Calibration Step T est Function Cal Range Input Cal Item U1251A U1252A 7 T urn the rot ary switch to the TEMP/ position Open Input terminal open (Remove any test leads an d Short Plugs from the input terminal) oPEn oPEn 10 nF 3 nF 03.
Performance Tests and Calib ration 7 Agilent U1251A/U 1252A User’s and Service Guide 141 10 Press button to go to 500 μ A3 0 μ A,1 kHz 030.00 μ A 030.00 μ A m A mode 300 μ A,1 kHz 300.0 0 μ A 300.00 μ A 5000 μ A3 0 0 μ A,1 kHz 0300.0 μ A 0300.
142 Agilent U1251A/U1252A Us er’s an d Service Guide 7 Performance Tests and Calibration Finishing the adjustment 1 Remo ve all the shor ting plugs and connectors from the instrument. 2 Record the new Calibration Count. 3 Press and simult aneously to exit t he Adjustment Mode.
Performance Tests and Calib ration 7 Agilent U1251A/U 1252A User’s and Service Guide 143 Calibration errors The follo wing errors indicate failures that may occur during a calibration.
144 Agilent U1251A/U1252A Us er’s an d Service Guide 7 Performance Tests and Calibration.
145 Agilent T echnologies Agilent U1251A and U1252A Ha ndheld Digital Multimeter User’s and Service Guide 7 Specifications Product Characteristics 146 Measurement Category 149 Measurement category d.
146 Agilent U1251A/U1252A Us er’s an d Service Guide 8 Specifications Product Characteristics POWER SUPPL Y Battery type: • 9 V size Ni-MH rechargeabl e battery , 7.
Specifications 8 Agilent U1251A/U 1252A User’s and Service Guide 147 SAFETY COMPLIANCE • EN/IEC 61010- 1:2001 • ANSI/UL 6101 0-1:2004 • CAN/CSA-C22.
148 Agilent U1251A/U1252A Us er’s an d Service Guide 8 Specifications W ARRANTY Please refer to http://www.agilent. com/go/warranty_terms • Three years for the product • Three months for the pro.
Specifications 8 Agilent U1251A/U 1252A User’s and Service Guide 149 Measurement Category The Agilent U1251A and U1252A Handheld Digital Multimeter has a saf ety rating of CA T III 1000 V/ CA T IV , 600 V . Measurement category definition Measurement CA T I are measurements perf ormed on circuits which are not directly connected to the A C mains.
150 Agilent U1251A/U1252A Us er’s an d Service Guide 8 Specifications Specification Assumptions • The DC specifications are defined for measurements which are taken after at least 1 minute of war m- up time.
Specifications 8 Agilent U1251A/U 1252A User’s and Service Guide 151 Electrical Specifications DC Specifications Ta b l e 7 - 1 DC Accuracy ± (% of reading + Number of Least Significant Digi t) Function Range Resolution T est Current/ Burden V oltage Accuracy U1251A U1252A Vo l t a g e [ 1 ] 50.
152 Agilent U1251A/U1252A Us er’s an d Service Guide 8 Specifications Function Range Resolution T est Current/ Burden V oltage Accuracy U1251A U1252A Current 500.00 µA 0.01 µA 0.06 V 0.1 + 5 [ 6 ] 0.05 + 5 [ 6 ] 5000.0 µA 0. 1 µA 0.6 V 0.1 + 5 [ 6 ] 0.
Specifications 8 Agilent U1251A/U 1252A User’s and Service Guide 153 AC Specifications AC specifications for U1251A Ta b l e 7 - 2 U1251A accuracy specifications ± (% of reading + number of LS D ) for true RMS AC voltage Function Range Resolution Frequency 30 Hz to 45 Hz 45 Hz to 1 kHz 1 kHz to 10 kHz 10 kHz to 30 kHz Vo l t a g e [ 1 ] 50.
154 Agilent U1251A/U1252A Us er’s an d Service Guide 8 Specifications AC specifications for U1252A Ta b l e 7 - 4 U1252A accuracy specifications ± (% of reading + number of LS D ) for true RMS AC v.
Specifications 8 Agilent U1251A/U 1252A User’s and Service Guide 155 AC+DC Specifications for U1252A Ta b l e 7 - 6 U1252A true RMS ac+dc voltage specifications Function Range Resolution Frequency 30 Hz – 45 Hz 45 Hz – 1 kHz 1 kHz – 10 kHz 10 kHz – 20 kHz 20kHz – 100kHz [ 1 ] Vo l t a g e [ 2 ] 50.
156 Agilent U1251A/U1252A Us er’s an d Service Guide 8 Specifications Capacitance Specifications T emperature Specifications Ta b l e 7 - 8 Capacitance specifications Function Range Resolution Accuracy ± (% of reading + Offset Erro r) Display update rate (approx) Capacitance 10.
Specifications 8 Agilent U1251A/U 1252A User’s and Service Guide 157 Frequency Specifications Duty Cycle and Pulse Width Specifications T able 7-10 Frequency specifications Range Resolution Accuracy ± (% of reading + No. of Least Significant D igit) Min.
158 Agilent U1251A/U1252A Us er’s an d Service Guide 8 Specifications Frequency Sensitivity Specifications For voltage measu rements T able 7-12 Frequency se nsitivity and tr igger leve l specificat.
Specifications 8 Agilent U1251A/U 1252A User’s and Service Guide 159 For current measu rements Peak Hold Specifications T able 7-13 Frequency se nsitivity specif ications fo r current measu rements Input Range Minimum Sensitivity (R.M.S. sine wave) 20 Hz – 20 kHz 500.
160 Agilent U1251A/U1252A Us er’s an d Service Guide 8 Specifications Frequency Counter Specifications for U1252A T able 7-15 Frequency cou nter (div ide by 1) specific ations Range Resolution Accuracy ± (% of reading + No. of Least Significant Digit) Sensitivity Min.
Specifications 8 Agilent U1251A/U 1252A User’s and Service Guide 161 Square W ave Output for U1252A T able 7-17 Square wave output specifications Output [ 1 ] Range Accuracy Frequency 0.5, 1, 2, 5, 1 0, 15, 20, 2 5, 30, 40, 5 0, 60, 75, 80, 100, 120, 150, 20 0, 240, 300, 400, 480, 60 0, 800, 1200 , 1600, 2400, 4800 Hz 0.
162 Agilent U1251A/U1252A Us er’s an d Service Guide 8 Specifications Operating Specifications Display update rate (approximate) T able 7-18 Display update ra te (approximate) Function T imes/second.
Specifications 8 Agilent U1251A/U 1252A User’s and Service Guide 163 Input impedance T able 7-19 Input Impedanc e Function Range Input Impedance DC V oltage [ 1 ] 50.000 mV 10.00 M Ω 500.00 mV 10.00 M Ω 1000.0 mV 10.00 M Ω 5.0000 V 11.10 M Ω 50.
164 Agilent U1251A/U1252A Us er’s an d Service Guide 8 Specifications.
© Agilent T e chnologies, Inc. 2006 – 2012 Printed in Malaysia T enth Editi on, May 4, 20 12 U1251-900 03 www .agilent.com Agilent T echnologies Contact us T o obtain service, warranty or technical.
An important point after buying a device Agilent Technologies U1251A (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
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