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User`s Guide

1. or sign indicates whether the measured or calculated value is positive or negative Each segment represents 1000 or 500 counts depending on the range indicated on the peak bar graph Table 1 10 Analog bar graph display Range Counts Used for the Segments function ea aaa ATE Ue alain eee new ac 500 V A Q ala SA ITITINITINT TTT Lg 0 1 2 3 SE MEHR SRE AEDT cal DE BELGE 1000 V A 0 gt An unstable bar graph and unmatched primary display when measuring DC voltage usually means the presence of AC voltages in the circuit 1 The analog bar graph measurement rate is approximately 50 times second for DC voltage current and resistance measurements U1271A U1272A User s Guide Introduction 1 Your Multimeter in Brief Input terminals The terminal connections for the different measurement functions of your multimeter are described in the table below Observe the rotary switch position of your multimeter before connecting the test leads to the connector terminals WARNING Ensure that the terminal connections are correct for that particular measurement function before starting any measurement CAUTION To avoid damaging this device do not exceed the rated input limit A CAT IV 600V USED iis CAT III 1000V Fuso Bo _ uA mA COM E9 0000 Figure 1 14 Connector terminals U1271A U1272A User s Guide 51 1 Introduction Your Multimeter in Brief Table 1 11 Terminal connecti
2. 10 us x frequency x 100 2 The accuracy of the duty cycle is determined from this equation 0 3 x frequency kHz 0 3 3 The accuracy of the pulse width is determined from this equation duty cycle accuracy frequency 0 01 ms 170 U1271A U1272A User s Guide Characteristics and Specifications 5 Electrical Specifications Frequency sensitivity specifications For voltage measurements Table 5 13 Frequency sensitivity and trigger level specifications for voltage measurements Minimum sensitivity RMS sine wave Trigger level for DC coupling 1 0 5 Hz to 15 Hz 0 5 Hz to 200 kHz Input range 3 15 Hz to 100 kHz Up to 1 MHz pac U1271A U1272A 30 mv 3 mV 3 mV 5 mV 300 mV 6 mV 8 mV 40m V 10 mV 15 mV 3V 0 12V 0 2 V 0 4 V 0 15 V 0 15 V 30 V 0 6 V 0 8 V 2 6 V 1 5 V 1 5 V 300 V 6V 8 V lt 100 kHz 9 V lt 100 kHz 9 V lt 100 kHz 1000 V 50 V 50 V lt 100 kHz 90V lt 100kHz 90V lt 100 kHz Notes for frequency sensitivity and trigger level specifications for voltage measurements 1 Maximum input for specified accuracy refer to AC specifications on page 161 2 30 mV range applicable for U1272A only 3 200 kHz to 1 MHz minimum sensitivity range applicable for U1272A only For current measurements Table 5 14 Frequency sensitivity specifications for current measurements i Minimum sensitivity RMS sine wave Input range 2 Hz to 30 kHz 300 uA 100 uA 3000 uA 70 uA 30 mA 1 2 mA
3. AC voltage measurement AC V with low v pass filter LPF AC coupling frequency measurement Hz AC voltage decibel display dBm with low p AC voltage measurement AC V with low pass filter LPF is enabled when is pass filter LPF pressed AC voltage measurement AC mV AC coupling frequency measurement Hz AC voltage decibel display dBm is enabled AC voltage measurement AC mV when is pressed TAN AC voltage measurement AC mV with low mV pass filter LPF AC coupling frequency measurement Hz AC voltage decibel display dBm with low AC voltage measurement AC mV with low pass filter a when is pass filter LPF 182 U1271A U1272A User s Guide Dual Display Combinations Using the Dual Key B Table B 2 U1272A dual display combinations continued Rotary switch position Function shown when is pressed in the U1272A Primary display Secondary display DC coupling frequency measurement Hz DC voltage measurement DC V AC voltage measurement AC V DC voltage decibel display Cou enabled DC voltage measurement DC V when is pressed AC coupling frequency measurement Hz AC voltage measurement AC V DC voltage measurement DC V T AC voltage decibel display dBm is enabled AC voltage measurement AC V when is pressed AC coupling frequency measurement Hz AC DC voltage measurement AC DC V AC voltage measurement AC V DC voltage measurement DC V AC DC voltage CECE dis
4. 2 Making Measurements Using Qik V for Voltage Measurements U1271A only Using Oik V for Voltage Measurements U1271A only Use the Qik V function to help you check for the presence of either or both AC and DC voltages before you set a precise range for a more accurate reading 1 To quickly identify the measured signal type rotate the multimeter s rotary switch to igy 2 Probe the test points and read the display The AC voltage measurement is shown in the primary display and the DC voltage measurement is shown in the secondary display Press to exchange the ACAC and DC voltage indication on the primary and secondary displays Figure 2 12 Qik V display Once the signal type is identified AC DC or AC DC voltage select the appropriate voltage measurement function by turning the rotary switch to an appropriate position and function AC DC or AC DC for a more accurate reading 70 U1271A U1272A User s Guide Making Measurements 2 Measuring Resistance Measuring Resistance CAUTION To avoid possible damage to your multimeter or to the equipment under test disconnect the circuit power and discharge all high voltage capacitors before measuring resistance U1271A U1272A User s Guide Resistance opposition to the current flow is measured by sending a small current out through the test leads to the circuit under test Because this current flows through all possible paths between the leads the resistance reading
5. Changing the minimum measurable frequency U1271A U1272A User s Guide This setting is used with frequency tests see page 101 Changing the minimum measurable frequency will influence the measurement rates for frequency duty cycle and pulse width measurements The typical measurement rate as defined in the specification is based on a minimum measurable frequency of 10 Hz Parameter Range Default setting FrEq 0 5 Hz or 10 Hz 0 5 Hz To change the minimum measurable frequency 1 Press for more than 1 second to enter the multimeter s setup menu 2 Press or until Fr 4 is shown on the secondary display Figure 4 13 FrEq display 3 Press or to change the frequency value 4 Press to save your changes or press te to discard your changes 5 Press and hold until the multimeter restarts to return to normal operation 143 4 Multimeter Setup Options Setup Menu Items Changing the baud rate This setting changes the baud rate for remote communications with a PC Parameter Range Default setting bAUd 9600 or 19200 bits second 9600 bits second To change the baud rate 1 Press for more than 1 second to enter the multimeter s setup menu 2 Press or until bAlld is shown on the secondary display Figure 4 14 bAUd display 3 Press or to change the baud rate 4 Press to save your changes or press oe to discard your changes 5 Press and hold until the multimeter restarts to r
6. Notes for frequency sensitivity specifications for current measurements 1 Maximum input for specified accuracy refer to AC specifications on page 161 U1271A U1272A User s Guide 171 5 Characteristics and Specifications Electrical Specifications Table 5 14 Frequency sensitivity specifications for current measurements continued iii Minimum sensitivity RMS sine wave Input range 2 Hz to 30 kHz 300 mA 12 mA 3A 0 12 A 10A 1 2A Notes for frequency sensitivity specifications for current measurements 1 Maximum input for specified accuracy refer to AC specifications on page 161 Peak hold specifications Table 5 15 Peak hold specifications for DC voltage and current measurements Signal width Accuracy for DC voltage and current Single event gt 1 ms Specified accuracy 400 Repetitive gt 250 us Specified accuracy 1000 172 U1271A U1272A User s Guide Characteristics and Specifications 5 Electrical Specifications Decibel dB specifications for U1272A Table 5 16 U1272A decibel specifications dB base Reference Default reference 1 mW dBm 1Q to 9999 Q 50Q 1 V dBV 1V 1V Notes for U1272A decibel specifications 1 The reading of dBm is indicated in decibels of power above or below 1 mW or decibels of voltage above or below 1 V The formula is calculated according to the voltage measurement and specified reference impedance Its accuracy is depended on the accuracy of the
7. w diode or semiconductor junctions measured between 0 3 V and 0 8 V 0 3 V lt reading lt 0 8 V Open voltage for diode lt 3 3 V DC Open voltage for Auto diode lt 2 5 V DC and gt 1 0 V DC 300 pal 0 01 uA 0 2 5 0 2 5 lt 0 04 V 3000 pal 0 1 uA 0 2 5 0 2 5 lt 0 4 V 30 mal 0 001 mA 0 2 5 0 2 5 lt 0 08 V Current 300 mal 0 01 mA 0 2 5 0 2 5 lt 1 00 V 3 AlZl 0 0001 A 0 3 10 0 3 10 lt 0 1V 10 APIA 0 001 A 0 3 10 0 3 10 lt 0 3 V Notes for DC current specifications AUN Overload protection for 300 uA to 300 mA range 0 44 A 1000 V 10 x 35 mm fast acting fuse Overload protection for 3 A to 10 A range 11 A 1000 V 10 x 38 mm fast acting fuse Specification for 300 mA range 440 mA continuous Specification for 10 A range 10 A continuous Add 0 3 to the specified accuracy when measuring signals gt 10 A to 20 A for 30 seconds maximum After measuring currents gt 10 A cool down the multimeter for twice the duration of the measured time before proceeding with low current measurements 160 U1271A U1272A User s Guide Characteristics and Specifications 5 Electrical Specifications AC specifications AC specifications for U1271A Table 5 2 U1271A true rms AC voltage specifications Accuracy Function Range Resolution 30 Hz to 45 Hz 5 kHz to 45 Hz to 65 Hz 1 kHz to 5 kHz 20 65 Hz to 1 kHz kHz 300 mV 0 01 mV 0 7 20 1 0 25 2 0 25 2 0 40 3V 0 0001 V 0
8. 10 10 MQ gt 100 MQ 300nS oons 1 10 10 R Notes for resistance specifications 1 Overload protection 1000 Vrms for short circuits with lt 0 3 A current Maximum open voltage is lt 3 3 V 3 Built in buzzer beeps when the resistance measured is less than 25 Q 10 Q The multimeter can capture intermittent measurements longer than 1 ms 4 The accuracy of the 30 Q to 3 kQ range is specified after the Null function is used to subtract the test lead resistance and thermal effect by shorting the test leads 5 For the ranges of 30 MQ and 100 MQ the RH is specified for lt 60 6 The temperature coefficient of the 100 MQ and 300 MQ range is 0 1 x specified accuracy C from 20 C to 18 C or 28 C to 55 C 7 The accuracy for ranges lt 50 nS is specified after the Null function is used on an open test lead U1271A U1272A User s Guide 159 5 Characteristics and Specifications Electrical Specifications Table 5 1 DC specifications continued Burden Input Accuracy Test current i d Function Range Resolution voltage impedance U1271A U1272A where applicable Approx 3 vil 0 0001 V 0 5 5 0 5 5 1mA to 2mA Diode Approx Autol 0 0001 V 0 5 5 0 1 mA to 0 3 mA Notes for diode specifications 1 Overload protection 1000 Vrms for short circuits with lt 0 3 A current 2 Built in buzzer beeps continuously when the voltage measured is less than 50 mV and beeps once for forward biased
9. DC current measurement DC mA AC current measurement AC mA AC coupling frequency measurement Hz AC current measurement AC mA mA A DC current measurement DC mA With the positive probe inserted into the HA mA terminal AC DC current measurement AC DC mA 0 20 or 4 20 DC mA DC current measurement DC A AC current measurement AC A mA A With the positive probe inserted into the A terminal AC DC current measurement AC DC A 0 20 or 4 20 DC A AC coupling frequency measurement Hz AC current measurement AC mA DC current measurement DC mA DC current measurement DC mAJ DC coupling frequency measurement Hz AC current measurement AC A AC coupling frequency measurement Hz DC current measurement DC A AC coupling frequency measurement Hz AC current measurement AC A DC current measurement DC A DC current measurement DC Ajl2 184 U1271A U1272A User s Guide Dual Display Combinations Using the Dual Key B Table B 2 U1272A dual display combinations continued Function shown when e is pressed in the Secondary display Rotary switch position U1272A Primary display DC coupling frequency measurement Hz DC current measurement DC uA AC current measurement AC uA AC coupling frequency measurement Hz AJ AC current measurement AC uA DC current measurement DC uA AC coupling frequency measurement Hz AC DC current measurement AC DC uA
10. Your multimeter allows simultaneous monitoring of real time voltage or current with frequency duty cycle or pulse width measurements Figure 2 36 highlights the primary functions allowing frequency measurements in your multimeter U1271A U1272A Figure 2 36 Functions allowing frequency measurement 101 2 Making Measurements Frequency Test Mode Measuring frequency Frequency is the number of cycles a signal completes each second Frequency is defined as 1 Period Period is defined as the time between the middle threshold crossings of two consecutive like polarity edges as shown in Figure 2 37 The multimeter measures the frequency of a voltage or current signal by counting the number of times the signal crosses a threshold level within a specified period of time Rise Time Fall Time l i i i 90 50 l i 10 i i lt lt Width rl Width __ I lt l Period gt Figure 2 37 Frequency pulse width and duty cycle measurements Pressing controls the input range of the primary function voltage or ampere and not the frequency range 1 To measure frequency rotate the switch to one of the primary functions allowing frequency measurements highlighted in Figure 2 36 To obtain the best measuring results for frequency measurements please use the AC measuring path 2 Press Ce Probe the test points and read the display 102 U1271
11. s range is set to 1000 V in the manual ranging mode 5 For 20 kHz to 100 kHz accuracy Three counts of the LSD per kHz of additional error is to be added for frequencies gt 20 kHz and signal inputs lt 10 of range Pwd U1271A U1272A User s Guide 163 5 Characteristics and Specifications Electrical Specifications Table 5 5 U1272A true rms AC current specifications Accuracy Function Range Resolution 20 Hz to 45 Hz Burden voltage 45 Hz to 65 Hz 65 Hz to 2 kHz 300 pall 0 01 uA 0 6 25 0 9 25 lt 0 04 V 3000 pA 0 1 uA 0 6 25 0 9 25 lt 0 4 V 30 malt 0 001 mA 0 6 25 0 9 25 lt 0 08 V Current 300 mAB 0 01 mA 0 6 25 0 9 25 lt 1 00 V 3 Al 0 0001 A 0 8 25 1 0 25 lt 0 1 V 10 APIA 0 001 A 0 8 25 1 0 25 lt 0 3V Notes for U1272A AC current specifications Overload protection for 300 uA to 300 mA range 0 44 A 1000 V 10 x 35 mm fast acting fuse Overload protection for 3 A to 10 A range 11 A 1000 V 10 x 38 mm fast acting fuse Specification for 300 mA range 440 mA continuous Specification for 10 A range 10 A continuous Add 0 3 to the specified accuracy when measuring signals gt 10 A to 20 A for 30 seconds maximum After measuring currents gt 10 A cool down the multimeter for twice the duration of the measured time before proceeding with low current measurements Pwd 164 U1271A U1272A User s Guide Characteristics and Specifications 5 Electrical Specificati
12. 0 3 Notes for duty cycle specifications 1 The accuracy for duty cycle and pulse width measurements is based on a 3 V square wave input to the DC 3 V range For AC couplings the duty cycle range can be measured within the range of 10 to 90 for signal frequencies gt 20 Hz 2 The range of the duty cycle is determined by the frequency of the signal 10 us x frequency x 100 to 1 10 us x frequency x 100 U1271A U1272A User s Guide 169 5 Characteristics and Specifications Electrical Specifications Table 5 11 Duty cycle and pulse width specifications Function Mode Range Resolution Accuracy at full scale duty cycle 999 99 ms 0 01 ms accuracy frequency 0 01 ms Pulse width duty cycle 2000 0 ms 0 1 ms accuracy frequency 0 1 ms Notes for pulse width specifications 1 The accuracy for duty cycle and pulse width measurements is based on a 3 V square wave input to the DC 3 V range 2 The pulse width positive or negative must be gt 10 us The range of the pulse width is determined by the frequency of the signal Calculation example Table 5 12 Duty cycle and pulse width calculation example Duty cycle range Accuracy Frequency From To Duty cyclel2 Pulse width 100 Hz 0 1 99 9 0 33 0 043 ms 1 kHz 1 99 0 6 0 016 ms Notes for duty cycle and pulse width calculation example 1 The range of the duty cycle is determined from this equation 10 us x frequency x 100 to 1
13. 0001 E to 9999 E Default is disabled 0009 d Set the scale conversion value from 0000 1 to 1000 0 The scale conversion unit can be set to V V A V or 000 no unit V Default is 1000 0 V V Reset the multimeter to its factory default settings Set the multimeter s temperature unit Celsius Celsius Fahrenheit Fahrenheit Fahrenheit Celsius Default is C Celsius page 101 and page 143 page 30 and page 144 page 30 and page 145 page 30 and page 146 page 74 and page 147 page 32 and page 148 page 110 and page 149 page 150 page 88 and page 151 U1271A U1272A User s Guide 129 4 Setup Menu Items 130 Multimeter Setup Options Setup Menu Items Changing the beep frequency The multimeter s beeper alerts users to the presence of circuit continuities operator errors such as incorrect lead connections for the selected function and newly sensed values for MaxMin and Peak recordings Parameter Range Default setting bEEP 3200 Hz 3491 Hz 3840 Hz 4267 Hz or 3491 Hz Off To change the beep frequency 1 Press for more than 1 second to enter the multimeter s setup menu 2 Press t lt or until hEEP is shown on the secondary display Figure 4 1 bEEP display 3 Press or to change the beep frequency Select FF to disable the beeper feature 4 Press to save your changes or press CEJ to discard your changes U1271A U1272A User s Guide Multimeter Set
14. 133 4 Multimeter Setup Options Setup Menu Items To change the variation count 1 Press for more than 1 second to enter the multimeter s setup menu 2 Press or until AHGLd is shown on the secondary display Figure 4 3 AHOLd display 3 Press or to set the variation count 4 Press to save your changes or press CEJ to discard your changes 5 Press and hold until the multimeter restarts to return to normal operation Changing the recording option This setting is used with the multimeter s Data Logging feature see page 116 There are three available recording options for the multimeter s Data Logging feature Parameter Range Default setting d LoG HAnd AUto or TriG HAnd 134 U1271A U1272A User s Guide Multimeter Setup Options 4 Setup Menu Items To change the recording option 1 Press for more than 1 second to enter the multimeter s setup menu 2 Press or until d Lof is shown on the secondary display Figure 4 4 d LoG display 3 Press or to set the recording option 4 Press to save your changes or press C to discard your changes 5 Press and hold until the multimeter restarts to return to normal operation Changing the sample interval duration U1271A U1272A User s Guide This setting is used with the multimeter s Interval Data Logging feature see page 118 The multimeter will record a measurement value at the beginning of every sample interval Parameter Range
15. Conductance is the reciprocal of resistance High values of conductance correspond to low values of resistance Conductance is measured in Siemens S The 300 nS range measures conductance in nano Siemens 1 nS 0 000000001 Siemens Because small conductance values correspond to extremely high resistance values the nS range allows you to easily calculate and determine the resistance of components up to 100 GQ 0 01 nS resolution 1 To measure conductance set the multimeter s rotary switch to smarta g and set up your multimeter as shown in Figure 2 14 2 Press until the conductance measurement is selected nS unit shown Probe the test points and read the display High resistance readings are susceptible to electrical noise Use averaging to smooth out most of the noisy readings Refer to Capturing Maximum and Minimum Values MaxMin on page 112 73 2 Testing for Continuity 74 Making Measurements Testing for Continuity CAUTION To avoid possible damage to your multimeter or to the equipment under test disconnect the circuit power and discharge all high voltage capacitors before testing for continuity Continuity is the presence of a complete path for current flow The continuity test features a beeper that sounds and a backlight that flashes as long as a circuit is complete or broken The audible and visual alert allows you to perform quick continuity tests without having to watch the display I
16. Decibel unit relative to 1 V Voltage units for voltage measurement Ampere units for current measurement Farad units for capacitance measurement Ohm units for resistance measurement Hertz units for frequency measurement Millisecond unit for pulse width measurement Percent unit for duty cycle measurement Degree Celsius unit for temperature measurement Degree Fahrenheit unit for temperature measurement Seconds unit for Peak and Recording mode elapsed time U1271A U1272A User s Guide 49 1 50 Introduction Your Multimeter in Brief Analog bar graph The analog bar emulates the needle on an analog multimeter without displaying the overshoot When measuring peak or null adjustments and viewing fast changing inputs the bar graph provides a useful indication because it has a faster updating rate to cater for fast response applications For frequency duty cycle pulse width 4 20 mA scale 0 20 mA scale dBm dBV and temperature measurements the bar graph does not represent the primary display value For example when frequency duty cycle or pulse width is displayed on the primary display during voltage or current measurement the bar graph represents the voltage or current value not the frequency duty cycle or pulse width value Another example is when 4 20 mA scale or 0 20 mA scale is displayed on the primary display the bar graph represents the current value and not the percentage value The
17. Using the Filter Function for DC measurement 63 Measuring AC and DC Signals U1272A only 64 Using the LPF Low Pass Filter Function for AC DC measurements 65 Making dB Measurements U1272A only 66 Using Z gw for Voltage Measurements U1272A only 68 Using Qik V for Voltage Measurements U1271A only 70 Measuring Resistance 71 Measuring Conductance 73 Testing for Continuity 74 Using Smart Q for Resistance Measurements U1272A only 77 Testing Diodes 80 Using Auto diode for Diode Tests U1272A only 84 Measuring Capacitance 86 Measuring Temperature 88 Measuring AC or DC Current 93 Scale of 4 20 mA or 0 20 mA 98 Frequency Test Mode 101 Measuring frequency 102 Measuring pulse width 104 Measuring duty cycle 105 The following sections describe how to take measurements with your multimeter 2 Making Measurements Crest Factor Crest Factor 56 The crest factor may be determined by using this formula Peak value yy t t eerie Cai facia True RMS value You may refer to Capturing Peak Values Peak on page 114 on how to obtain the peak values The crest factor may be up to 3 0 at full scale except for the 1000 V range where it is 1 5 at full scale as explained in the table below Voltage range Crest factor Maximum input Vpeak 30 mV 3 90 mV 300 mV 3 900 mV 3V 3 9V 30 V 3 90V 300 V 3 900V 1000 V 1 5 1500 V U1271A U1272A User s Guide Making Measurements 2 Measuring AC Voltage Mea
18. however the reading can vary depending on the resistance of other pathways between the probe tips 3 Reverse the probes as shown in Figure 2 22 and measure the voltage across the diode again Assess the diode according to the following guidelines e A diode is considered good if the multimeter displays UL in reverse bias mode e A diode is considered shorted if the multimeter displays approximately 0 V in both forward and reverse bias modes and the multimeter beeps continuously e A diode is considered open if the multimeter displays DL in both forward and reverse bias modes Figure 2 20 Open diode display If the beeper is enabled during diode test the multimeter will beep briefly for a normal junction and sound continuously for a shorted junction below 0 050 V See Changing the beep frequency on page 130 to disable the beeper U1271A U1272A User s Guide 81 2 82 Making Measurements Testing Diodes U1272A True RMS Multimeter 10A MAX CATIV 600V CAT Ill 1000 FUSED 440mA T FUSED 7 CE A HA mA COM tv Figure 2 21 Testing forward bias diode U1271A U1272A User s Guide Making Measurements 2 Testing Diodes U1272A True RMS Multimeter 10A MAX CATIV 600V FUSED TE CAT IN 1000V mi F FUSED F b A HA mA COM gt y v Figure 2 22 Testing reverse bias diode U1271A U1272A User s Guide 83 2 Making Measurements Using Auto diode for Diode Tests U1272A only Using Auto diode
19. represents the total resistance of all paths between the leads Resistance is measured in ohms Q 1 To measure resistance set the multimeter s rotary switch to dsmata g and set up your multimeter as shown in Figure 2 14 2 Probe the test points and read the display Figure 2 13 Resistance display Keep the following in mind when measuring resistance e The test leads can add 0 1 Q to 0 2 Q of error to resistance measurements To test the leads touch the probe tips together and read the resistance of the leads To remove lead resistance from the measurement hold the test lead tips together and press ae Now the resistance at the probe tips will be subtracted from all future display readings 71 Making Measurements Measuring Resistance e Because the multimeter s test current flows through all possible paths between the probe tips the measured value of a resistor in a circuit is often different from the resistor s rated value The resistance function can produce enough voltage to forward bias silicon diode or transistor junctions causing them to conduct If this is suspected press to apply a lower current in the next higher range U1272A True RMS Multimeter CATIV 600V CAT III 1000V 0A MAX FUSED 44omA F FUSED 7 PE A HA mA Figure 2 14 Measuring resistance 72 U1271A U1272A User s Guide Making Measurements 2 Measuring Conductance Measuring Conductance U1271A U1272A User s Guide
20. s View mode Press CH again to cycle through the manual H interval A or event previously stored records Figure 3 9 View display If nothing has been recorded H Lr A fLr or E fLr will be displayed instead Figure 3 10 Empty view display 122 U1271A U1272A User s Guide Multimeter Features 3 Reviewing Previously Recorded Data View 2 Select the desired recording category to view its entries i Press to jump to the first stored entry ii Press to jump to the last stored entry Press to view the next stored entry The index number increases by one iv Press to view the previous stored entry The index number decreases by one v Press for more than 1 second to clear all entries for the selected log type 3 Press ae for more than 1 second to exit the View mode U1271A U1272A User s Guide 123 3 Multimeter Features Reviewing Previously Recorded Data View THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK 124 U1271A U1272A User s Guide U1271A U1272A Handheld Digital Multimeter User s Guide 4 Multimeter Setup Options Using the Setup Menu 126 Editing numerical values 127 Setup Menu Summary 128 Setup Menu Items 130 Changing the beep frequency 130 Enabling and disabling the Filter 131 Changing the variation count 133 Changing the recording option 134 Changing the sample interval duration 135 Changing the decibel display U1272A only 136 Setting a custom dBm reference impedance U1272A
21. 4 1 Table 4 2 Table 4 3 Table 4 4 Table 4 5 Table 5 1 Table 5 2 Table 5 3 Table 5 4 Table 5 5 Table 5 6 Table 5 7 Table 5 8 Table 5 9 Table 5 10 Table 5 11 Table 5 12 Battery level indicator 25 Power on options 32 Front panel parts 35 Rear panel parts 36 U1271A rotary switch functions 38 U1272A rotary switch functions 39 Keypad functions 42 General annunciators 45 Measurement units display 49 Analog bar graph display 50 Terminal connections for different measuring functions 52 Threshold resistance values 74 Auto diode voltage thresholds 84 Scale measurement range 99 Available scale conversions 110 Data logging maximum capacity 116 Event log trigger conditions 120 Setup menu key functions 126 Setup menu item descriptions 128 Filter LPF options 132 Firmware version 2 00 or older 132 Firmware version 2 04 ornewer 132 DC specifications 158 U1271A true rms AC voltage specifications 161 U1271A true rms AC current specifications 162 U1272A true rms AC voltage specifications 163 U1272A true rms AC current specifications 164 U1272A true rms AC DC voltage specifications 165 U1272A true rms AC DC current specifications 166 Capacitance specifications 167 Temperature specifications 168 Frequency specifications 169 Duty cycle and pulse width specifications 169 Duty cycle and pulse width calculation example 170 20 Table 5 13 Table 5 14 Table 5 15 Table 5 16 Table 5 17 Table 5 18 Ta
22. Aito 200 10000 Event Eri G Shares the same memory with Interval logging Before starting a recording session set up the multimeter for the measurements to be recorded 116 U1271A U1272A User s Guide Multimeter Features 3 Recording Measurement Data Data Logging Select the data logging option 1 Press for more than 1 second to enter the multimeter s Setup mode Press until d Lol is shown on the secondary display Press or to change the data logging option Available options HAnd Alito or krib Press to save the changes Press and hold until the multimeter restarts Performing manual logs HAnd U1271A U1272A User s Guide Ensure that HAnd is selected as the data logging option in the multimeter s Setup 1 Press for more than 1 second to store the present input signal value and the log entry number are displayed at the top of the display The display will return to normal after a short while around 1 s Figure 3 6 Manual log display 2 Repeat step 1 again to save the next input signal value 117 3 118 Multimeter Features Recording Measurement Data Data Logging The maximum number of readings that can be stored for the manual log is 100 entries When all entries are occupied H Fift will be shown when is pressed See the Reviewing Previously Recorded Data View section later in this manual to review or erase the recorded entries Performing interval logs AUto E
23. Default setting L tiME 1 to 99999 s 1s 135 4 136 Multimeter Setup Options Setup Menu Items To change the sample interval duration 1 Press for more than 1 second to enter the multimeter s setup menu 2 Press or until L AE is shown on the secondary display Figure 4 5 L tiME display 3 Press or to set the sample interval duration 4 Press to save your changes or press CEJ to discard your changes 5 Press and hold until the multimeter restarts to return to normal operation Changing the decibel display U1272A only This setting is used with dB measurements see page 66 You can enable the multimeter to display voltage as a dB value either relative to 1 milliwatt dBm or a reference voltage of 1 volt dBV Parameter Range Default setting dCibEL On dBm On dBV or Off On dBm U1271A U1272A User s Guide Multimeter Setup Options 4 Setup Menu Items To change the decibel display 1 Press for more than 1 second to enter the multimeter s setup menu 2 Press or until df bEL is shown on the secondary display Figure 4 6 dCibEL display 3 Press or to change the decibel display Select gFF to disable dB measurements 4 Press to save your changes or press CEJ to discard your changes 5 Press and hold until the multimeter restarts to return to normal operation Setting a custom dBm reference impedance U1272A only U1271A U1272A User s Guide This settin
24. Enabling and disabling the backlight alert U1271A U1272A User s Guide The multimeter s backlight will flash to alert users to the presence of circuit continuities and operator errors such as incorrect lead connections for the selected function Parameter Range Default setting A bLit on or Off on To enable the backlight alert 1 Press for more than 1 second to enter the multimeter s setup menu 2 Press or until fi b is shown on the secondary display Figure 4 17 A bLit display 3 Press or to enable or disable the backlight alert feature 4 Press to save your changes or press CEJ to discard your changes 5 Press and hold until the multimeter restarts to return to normal operation 147 4 148 Multimeter Setup Options Setup Menu Items Enabling smooth mode Smooth is used to smoothen the refresh rate of the readings in order to reduce the impact of unexpected noise and to help you achieve a stable reading You can enable Smooth by holding CW while turning on the multimeter Power on options on page 32 This method however is temporary and Smooth will be turned off when you cycle the multimeter s power You can permanently enable Smooth from the Setup mode Parameter Range Default setting SMootH 0001 d to 9999 d or 0001 E to 0009 d disabled 9999 E To enable Smooth 1 Press for more than 1 second to enter the multimeter s setup menu 2 Press or unt
25. Rane Press or to step through the menu Press or at each menu item to change the preset settings The menu item in the secondary display will flash to indicate that you can now change the values shown in the primary display Press amp or again to switch between two values to cycle through multiple values from a list or to decrease or increase a numerical value While the menu item is flashing press to Log save your changes While the menu item is flashing press to discard your changes U1271A U1272A User s Guide Multimeter Setup Options 4 Using the Setup Menu Editing numerical values U1271A U1272A User s Guide When editing numerical values use the G lt and Ke to position the cursor on a numerical digit e Press to move the cursor to the left and e Press to move the cursor to the right When the cursor is positioned over a digit use the and keys to change the numerical digit e Press to increment the digit and e Press to decrement the digit When you have completed your changes save the new numerical value by pressing ae Or alternatively if you wish to discard the changes you made press GS 127 4 Multimeter Setup Options Setup Menu Summary Setup Menu Summary The Setup menu items are summarized in the table below Click the respective Learn more pages for more information on each menu item Table 4 2 Setup menu item descriptions Legend Availa
26. Temperature Do not connect the thermocouple to electrically live circuits Doing so will potentially cause fire or electric shock CAUTION Do not bend the thermocouple leads at sharp angles Repeated bending over a period of time can break the leads The multimeter uses a type K default setting temperature probe for measuring temperature 1 To measure temperature position the rotary switch to and press C once Set up your multimeter as shown in Figure 2 29 2 Probe the test points and read the display The primary display normally shows temperature or the message GL open thermocouple The open thermocouple message may be due to a broken open probe or because no probe is installed into the input jacks of the multimeter Figure 2 27 Temperature display Press to change the temperature units between C or F you must first change the temperature unit to switch between C and F or F and C See Changing the default temperature unit on page 90 for more information U1271A U1272A User s Guide Making Measurements 2 Measuring Temperature Always set the temperature unit display per the official requirements CAUTION f and in compliance with the National laws of your region NOTE Shorting the terminal to the COM terminal will display the temperature at the multimeter s terminals gilent U1272A True RMS Multimeter 10A MAX FUSED 440mA m FUSED A HA mA CAT IV 60
27. To make a dBV measurement first set the rotary switch fal to AY Gy v OY we 2 Press for more than 1 second to enter the multimeter s Setup mode 3 Press until dL bEL is shown on the secondary display Press until on dBv is shown on the primary display 4 Press to save the changes Press and hold until the multimeter restarts 5 Press until the voltage measurements are displayed as a dBV value as shown in Figure 2 10 Figure 2 10 dBV display To make the multimeter display dBm values again repeat step 2 to step 4 and select on dBm instead See Changing the decibel display U1272A only on page 136 to learn more Press for more than 1 second to exit the dBV function Selecting the frequency test mode also cancels the dBV function 67 2 Making Measurements Using Z gw for Voltage Measurements U1272A only Using Z pw for Voltage Measurements U1272A only CAUTION Do not use the Z ow function to measure voltages in circuits that could be damaged by this function s low impedance 2 kQ Use the Z ow Cow input impedance function to remove ghost or induced voltages from your measurements Ghost voltages are voltages present on a circuit that should not be energized Ghost voltages can be caused by capacitive coupling between energized wiring and adjacent unused wiring Z ow can remove ghost voltages from your measurements by dissipating the coupling voltage Use Z ow to reduce
28. V Alkaline battery ANSI NEDA 24A or IEC LRO3 or e 4x 1 5 V Zinc Chloride battery ANSI NEDA 24D or IEC R03 Battery life 300 hours typical based on new Alkaline batteries for DC voltage measurement e Low battery indicator will flash when the battery voltage drops below 4 4 V approximately POWER CONSUMPTION 460 mVA maximum with backlight enabled FUSE 10x35 mm 440 mA 1000 V fast acting fuse 10x38 mm 11 A 1000 V fast acting fuse DISPLAY Liquid crystal display LCD with maximum reading of 33000 counts INPUT IMPEDANCE AT OFF MODE U1272A only 1 67 KO protected by positive temperature coefficient resistor OPERATING ENVIRONMENT Operating temperature from 20 C to 55 C 0 to 80 RH e Full accuracy up to 80 RH for temperatures up to 30 C decreasing linearly to 50 RH at 55 C Altitude up to 2000 meters e Pollution degree II STORAGE COMPLIANCE 40 C to 70 C 0 to 80 RH SAFETY COMPLIANCE EN IEC 61010 1 2001 ANSI UL 61010 1 2004 and CAN CSA C 22 2 No 61010 1 04 U1271A U1272A User s Guide Characteristics and Specifications 5 Product Characteristics MEASUREMENT CATEGORY CAT III 1000 V CAT IV 600 V ELECTROMAGNETIC COMPATIBILITY EMC Commercial limits compliance with EN61326 1 IP RATING IP 54 TEMPERATURE COEFFICIENT 0 05 x specified accuracy C from 20 C to 18 C or 28 C to 55 C COMMON MODE REJECTION RATIO CMRR gt 120 dB at DC 50
29. are controlled by pulses of varying width which can be checked by measuring duty cycle 1 To measure duty cycle position the rotary switch on one of the functions allowing frequency measurements shown in Figure 2 36 2 Press until the measurements are displayed as a percentage Probe the test points and read the display Figure 2 40 Duty cycle display The duty cycle percentage of the input signal is shown in the primary display The voltage or ampere value of the signal is shown in the secondary display The bar graph does not indicate duty cycle but indicates the voltage or ampere value of the input signal 105 2 106 Making Measurements Frequency Test Mode The pulse polarity is displayed to the left of the duty cycle value fF indicates a positive pulse and J indicates a negative pulse To change the polarity being measured press Press to cycle through the frequency pulse width and duty cycle measurements Press for more than 1 second to exit the duty cycle measurement function U1271A U1272A User s Guide KEYSIGHT TECHNOLOGIES U1271A U1272A Handheld Digital Multimeter User s Guide 3 Multimeter Features Making Relative Measurements Null 108 Making Scale Transfers Scale 110 Capturing Maximum and Minimum Values MaxMin 112 Capturing Peak Values Peak 114 Freezing the Display TrigHold and AutoHold 115 Recording Measurement Data Data Logging 116 Performing manual logs HAnd 117 Pe
30. cover Lift the tilt stand and loosen the screws with a suitable Phillips screwdriver and remove the battery cover as shown in Figure 1 1 N Insert the battery Observe the proper battery polarity The terminal ends of each battery are indicated inside the battery compartment wo Close the battery cover Place the battery cover back in its original position and tighten the screws Figure 1 1 Installing the batteries The battery level indicator in the lower left hand corner of the display indicates the relative condition of the batteries Table 1 1 describes the various battery levels the indicator represents U1271A U1272A User s Guide Introduction 1 Preparing Your Multimeter Table 1 1 Battery level indicator Indication Battery capacity ose Full capacity Cs 2 3 capacity D 1 3 capacity Flashing periodically Almost empty less than one day To avoid false readings which could lead to possible electric shock or personal injury replace the battery as soon as the low battery indicator appears Do not discharge the battery by shorting the battery or reverse the battery polarity in any of the subjects CAUTION To avoid instruments being damage from battery leakage e Always remove dead batteries immediately e Always remove the batteries and store them separately if the multimeter is not going to be used for a long period U1271A U1272A User s Guide 25 1 Introduction Preparing Your
31. for Diode Tests U1272A only The auto diode function will help you test both forward bias and reverse bias directions simultaneously You do not need to change the measuring direction to identify the diode s status Table 2 2 Auto diode voltage thresholds Forward voltage Reverse voltage Diode status Primary display Secondary display Good No Good OL or lt 0 3 V or gt 0 8 V OL or gt 0 3 V or lt 0 8 V x Within 0 3 V to 0 8 V OL Vv OL Within 0 3 V to 0 8 V Vv The open condition will not be alerted as OL on both directions if the auto diode function is used 1 Rotate the multimeter s rotary switch to awo and set up your multimeter as shown in Figure 2 21 2 Press CEJ to activate the auto diode function Auto gt The primary display shows the forward bias voltage value The reverse bias voltage value is shown in the secondary display ood is shown briefly along with a single beep on the secondary display if the diode is in a good condition nbaad is shown briefly along with two beeps if the diode is out of the thresholds 84 U1271A U1272A User s Guide Making Measurements 2 Using Auto diode for Diode Tests U1272A only Figure 2 23 Auto diode display Good status Figure 2 24 Auto diode display nGood status U1271A U1272A User s Guide 85 2 Making Measurements Measuring Capacitance Measuring Capacitance CAUTION To avoid possible damage to the multimeter or to th
32. information contained herein Should Key sight and the user have a separate written agreement with warranty terms covering the material in this document that conflict with these terms the warranty terms in the separate agreement shall control Technology Licenses The hardware and or software described in this document are furnished under a license and may be used or copied only in accor dance with the terms of such license Restricted Rights Legend U S Government Restricted Rights Soft ware and technical data rights granted to the federal government include only those rights customarily provided to end user cus tomers Keysight provides this customary commercial license in Software and techni cal data pursuant to FAR 12 211 Technical Data and 12 212 Computer Software and for the Department of Defense DFARS 252 227 7015 Technical Data Commercial Items and DFARS 227 7202 3 Rights in Commercial Computer Software or Com puter Software Documentation Safety Notices CAUTION A CAUTION notice denotes a haz ard It calls attention to an operat ing procedure practice or the likes of that if not correctly performed or adhered to could result in dam age to the product or loss of important data Do not proceed beyond a CAUTION notice until the indicated conditions are fully understood and met A WARNING notice denotes a hazard It calls attention to an operating procedure practice or the likes of tha
33. mA 98 Frequency Test Mode 101 Measuring frequency 102 Measuring pulse width 104 Measuring duty cycle 105 Multimeter Features Making Relative Measurements Null 108 Making Scale Transfers Scale 110 Capturing Maximum and Minimum Values MaxMin 112 U1271A U1272A User s Guide U1271A U1272A User s Guide Capturing Peak Values Peak 114 Freezing the Display TrigHold and AutoHold 115 Recording Measurement Data Data Logging 116 Performing manual logs HAnd 117 Performing interval logs AUto 118 Performing event logs triG 120 Reviewing Previously Recorded Data View 122 Multimeter Setup Options Using the Setup Menu 126 Editing numerical values 127 Setup Menu Summary 128 Setup Menu Items 130 Changing the beep frequency 130 Enabling and disabling the Filter 131 Changing the variation count 133 Changing the recording option 134 Changing the sample interval duration 135 Changing the decibel display U1272A only 136 Setting a custom dBm reference impedance U1272A only 137 Changing the auto power off and backlight timeouts 138 Enabling and disabling the overvoltage alert 140 Changing the scalerange 141 Changing the thermocouple type U1272A only 142 Changing the minimum measurable frequency 143 Changing the baudrate 144 Changing the data bits 145 Changing the parity check 146 Enabling and disabling the backlight alert 147 Enabling smooth mode 148 Changing the user scale conversion value and unit 1
34. mode 1 Select one of the four modes stated in Table 3 3 2 Press for more than 1 second to start event log mode and the log entry number are displayed at the top of the display Subsequent readings are automatically recorded into the multimeter s memory every time the trigger condition specified in Table 3 3 is satisfied U1271A U1272A User s Guide Multimeter Features 3 Recording Measurement Data Data Logging Figure 3 8 Event log display 3 Press for more than 1 second to exit the event log mode The maximum number of readings that can be stored for the event log is 10000 entries for the U1272A and 200 entries for the U1271A When all entries are occupied F FLLL will be shown when is pressed The event and interval log share the same memory buffer total combined 10000 entries for U1272A and 200 entries for U1271A Increased usage of the event log entries will lead to the decrease of the maximum entries for the interval log and vice versa See the Reviewing Previously Recorded Data View section later in this manual to review or erase the recorded entries NOTE APO auto power off is disabled during the recording session U1271A U1272A User s Guide 121 3 Multimeter Features Reviewing Previously Recorded Data View Reviewing Previously Recorded Data View Viewing data stored in the multimeter s memory is performed through the key 1 Press C for more than 1 second to enter the multimeter
35. return to normal operation Resetting the multimeter s setup options The multimeter s setup options can be reset to its default values through the setup menu Parameter Range Default setting rESEt dEFAU dEFAU 1 Press for more than 1 second to enter the multimeter s setup menu 2 Press until rESEt is shown on the secondary display Figure 4 20 rESEt display 3 Press and hold for more than 1 second to perform the reset The multimeter will beep once and return to the first setup menu item bEEP U1271A U1272A User s Guide Multimeter Setup Options 4 Setup Menu Items Changing the temperature unit U1271A U1272A User s Guide This setting is used with temperature measurements see page 88 Four combinations of displayed temperature unit s are available e Celsius only Temperature measured in C e Celsius Fahrenheit During temperature measurements press to switch between C and F e Fahrenheit only Temperature measured in F e Fahrenheit Celsius During temperature measurements press to switch between F and C Parameter Range Default setting t Unit C C F F or F C C To change the temperature unit 1 Press for more than 1 second to enter the multimeter s setup menu 2 Press for more than 1 second until E Um E is shown on the secondary display Figure 4 21 t Unit display 3 Press or to change the temperature unit 4 Press to save your c
36. the rotary switch to N Lied i For voltage measurements 7 or 7 pita N ii For current measurements Ka OY A 2 Press the o key twice to cycle the measurement function to the AC DC mode Probe the test points and read the display Figure 2 7 AC DC voltage display For better accuracy when measuring the DC offset of an AC voltage measure the AC voltage first Note the AC voltage range then manually select a DC voltage range equal to or higher than the AC range This procedure improves the accuracy of the DC measurement by ensuring that the input protection circuits are not activated NOTE Press amp to cycle through the available dual display combinations See Appendix B Dual Display Combinations Using the Dual Key starting on page 179 to learn more Press to enable the frequency test mode for voltage measurements See Frequency Test Mode on page 101 to learn more U1271A U1272A User s Guide Making Measurements 2 Measuring AC and DC Signals U1272A only Using the LPF Low Pass Filter Function for AC DC measurements Your multimeter is equipped with an AC low pass filter to help reduce unwanted electronic noise when measuring a mixed signal 1 Enable the LPF You may refer to Enabling and disabling the Filter on page 131 2 Rotate the multimeter s rotary switch to 7 3 Your multimeter continues measuring in the AC DC mode but now the signal diverts through a filt
37. up to millivolts Hos page 71 and q Resistance measurement or Continuity test page 74 gt Diode test page 80 U1271A U1272A User s Guide Introduction 1 Your Multimeter in Brief Table 1 5 U1271A rotary switch functions continued Legend Description Learn more on e 86 and 4 Capacitance or Temperature measurement page Boa page 88 AC or DC current measurement mA A page 93 ae AC or DC current measurement up to HA microamperes Figure 1 11 U1272A rotary switch Each position of the U1272A rotary switch shown in Figure 1 11 is described in Table 1 6 Table 1 6 U1272A rotary switch functions Legend Description Learn more on Ztow Low impedance AC or DC voltage Aaa GR ST measurement for eliminating ghost voltages pag Off page 25 U1271A U1272A User s Guide 39 1 Introduction Your Multimeter in Brief Table 1 6 U1272A rotary switch functions continued Legend Description Learn more on LPF Y AC voltage measurement with Low Pass Filter page 56 and ai AC voltage measurement up to millivolts page 59 mV with Low Pass Filter F AC DC or AC DC voltage measurement page 60 and AC DC or AC DC voltage measurement up page 64 mV to millivolts Resistance measurement Continuity test or page 71 smart a Resistance measurement with offset page 74 and compensation page 77 Pr Auto Diode test or Auto diode test page Bt and page 84 3 Capacitance or Temperature measuremen
38. voltage measurement See Table 5 17 2 Auto ranging mode is used 3 The bandwidth is according to voltage measurements Decibel dBV accuracy specifications Table 5 17 U1272A decibel accuracy specifications for DC voltage measurements dBV range Accuracy 20 Hz to Range Minimum Maximum SES 45 Hz 1 kHz to 5 kHz to 20 kHz to 65 Hz 65 Hz to 5 kHz 20 kHz 100 kHz 1 kHz 30 mV 56 48 30 46 0 06 0 07 0 09 0 1 0 32 300 mV 36 48 10 46 0 06 0 07 0 09 0 1 0 32 3V 16 48 9 54 0 06 0 09 0 14 0 19 0 32 30 V 3 52 29 54 0 06 0 09 0 14 0 19 0 32 300 V 23 52 49 54 0 06 0 09 0 14 0 19 1000 V 33 98 60 0 06 0 09 0 14 U1271A U1272A User s Guide 173 5 Characteristics and Specifications Electrical Specifications Measurement rate approximate Table 5 18 Measurement rate approximate Function AC V V or mV DC V V or mV Q Q with offset compensation Diode Auto diode Capacitance DC A uA mA or A AC A uA mA or A Temperature Frequency Duty cycle Pulse width U1271A 7 7 14 14 4 lt 100 uF 7 7 7 2 gt 10 Hz 1 gt 10 Hz 1 gt 10 Hz U1272A 7 7 14 3 14 3 4 lt 100 uF 7 7 7 2 gt 10 Hz 1 gt 10 Hz 1 gt 10 Hz 174 U1271A U1272A User s Guide KEYSIGHT TECHNOLOGIES U1271A U1272A Handheld Digital Multimeter User s Guide Appendix A Shift Functions Using the Shift Key Table A 1 U1271A default and shift functions 176 Table A 2 U1272A default and shif
39. 0 mV 30 mV for the 30 Q range and 1 0 V 0 2 V for the 300 Q 3 kQ 30 kQ and 300 kQ ranges If the DC voltage on the resistor is over the maximum correctable offset bias voltage fi is shown on the secondary display 1 To use the Smart Q function rotate the multimeter s rotary switch to smato and press CEJ until is shown on the display 2 Probe the test points and read the display The resistance measurement and the bias voltage measurement is shown in the primary and secondary displays respectively Press to switch between the leakage uA and bias mV display U1271A U1272A User s Guide 71 2 78 Making Measurements Using Smart Q for Resistance Measurements U1272A only Figure 2 17 Smart Q with bias voltage display Use Smart Q to measure the resistance of a thermocouple sensor It is useful to measure the resistance of a thermocouple temperature sensor The thermovoltage is proportional to the temperature and the impact of the resistance measurement Using the Smart function will help you achieve precise readings regardless of the temperature U1271A U1272A User s Guide Making Measurements 2 Using Smart Q for Resistance Measurements U1272A only Use Smart to measure leakage current Use the Smart function to measure leakage current or reverse current for junction diodes Such leakage currents are negligible and are usually measured in units of WA or nA Instead of having to source a high pr
40. 0V CAT Ill 1000V IN A Type K Thermocouple Probe Figure 2 28 Measuring surface temperature U1271A U1272A User s Guide 89 2 Making Measurements Measuring Temperature Changing the default thermocouple type U1272A only You can change the thermocouple type J or K by accessing the multimeter s Setup 1 Press for more than 1 second to enter the multimeter s Setup mode 2 Press until CoUPLE is shown on the secondary display Press or to change the thermocouple type Available options EYPEW or typem 3 Press to save the changes Press and hold until the multimeter restarts Changing the default temperature unit You can change the temperature unit degree Celsius Celsius Fahrenheit Fahrenheit or Fahrenheit Celsius by accessing the multimeter s Setup 1 Press for more than 1 second to enter the multimeter s Setup mode 2 Press for more than 1 second until E Uni E is shown on the secondary display Press or to change the temperature unit Available options e Of Temperature measured in C e OF OF During temperature measurements press to switch between C and F e Of Temperature measured in F e OF OF During temperature measurements press to switch between F and C 3 Press to save the changes Press and hold until the multimeter restarts 90 U1271A U1272A User s Guide Making Measurements 2 Measuring Temperature The bead type thermocouple probe is suitable f
41. 1 A 0 9 35 1 3 35 lt 0 1V 10 APIA 0 001 A 0 9 35 1 3 35 lt 0 3V Notes foe U1272A AC DC current specifications Overload protection for 300 uA to 300 mA range 0 44 A 1000 V 10 x 35 mm fast acting fuse Overload protection for 3 A to 10 A range 11 A 1000 V 10 x 38 mm fast acting fuse Specification for 300 mA range 440 mA continuous Specification for 10 A range 10 A continuous Add 0 3 to the specified accuracy when measuring signals gt 10 A to 20 A for 30 seconds maximum After measuring currents gt 10 A cool down the multimeter for twice the duration of the measured time before proceeding with low current measurements Pwd 166 U1271A U1272A User s Guide Characteristics and Specifications 5 Electrical Specifications Capacitance specifications Table 5 8 Capacitance specifications Accuracy Measuring rate Range Resolution UA TERRY at full scale 10 nF 0 001 nF 1 5 1 5 100 nF 0 01 nF 1 2 1 2 1000 nF 0 1 nF 1 2 1 2 4 times second 10 uF 0 001 uF 1 2 1 2 100 uF 0 01 uF 1 2 1 2 1000 uF 0 1 uF 1 2 1 2 0 5 times second 10 mF 0 001 mF 1 2 1 2 0 3 times second Notes for capacitance specifications 1 Overload protection 1000 Vrms for short circuits with lt 0 3 A current 2 The accuracy of for all ranges is specified based on a film capacitor or better and after the Null function is used to subtract the residual values by opening the test leads U1271A U1272A Use
42. 1A U1272A User s Guide Making Measurements 2 Measuring DC Voltage Using the Filter Function for DC measurement Turn on the Filter Function when measuring DC voltage and or current from a mixed signal AC DC components in the DC voltage measurement mode See Enabling and disabling the Filter on page 131 for more information The Filter Function blocks and attenuates AC signals to help you read the DC measurement from a mixed signal For instance a DC offset with an AC voltage signal presence for example AC 100 V 220 V applied to the 3 V range The will appear if the Filter is enabled in the multimeter s Setup Figure 2 6 Filter for DC voltage measurements To avoid possible electric shock or personal injury enable the Filter to verify the presence of hazardous DC voltages Displayed DC voltage values can be influenced by high frequency AC components and must be filtered to assure an accurate reading Do not enable any of the dual display options when performing measurements to verify the presence of hazardous DC voltages U1272A only U1271A U1272A User s Guide 63 2 Making Measurements Measuring AC and DC Signals U1272A only Measuring AC and DC Signals U1272A only 64 Your multimeter is capable of displaying both AC and DC signal components voltage or current as two separate readings or one AC DC rms value combined 1 Set up your multimeter according to your desired measurement Set
43. 49 Resetting the multimeter s setup options 150 Changing the temperature unit 151 5 Characteristics and Specifications Product Characteristics 154 Specification Assumptions 156 Measurement Category 156 Measurement category definition 156 Electrical Specifications 158 DC specifications 158 AC specifications 161 AC DC specifications for U1272A 165 Capacitance specifications 167 Temperature specifications 168 Frequency specifications 169 Duty cycle and pulse width specifications 169 Frequency sensitivity specifications 171 Peak hold specifications 172 Decibel dB specifications for U1272A 173 Measurement rate approximate 174 A Shift Functions Using the Shift Key B Dual Display Combinations Using the Dual Key U1271A U1272A User s Guide List of Figures U1271A U1272A User s Guide Figure 1 1 Installing the batteries 24 Figure 1 2 Start up display 26 Figure 1 3 Input warning display 29 Figure 1 4 Tilt stand adjustment and IR cable connection 30 Figure 1 5 Keysight GUI Data Logger Software 31 Figure 1 6 Width dimensions 33 Figure 1 7 Height and depth dimensions 34 Figure 1 8 Frontpanel 35 Figure 1 9 Rearpanel 36 Figure 1 10 U1271A rotary switch 38 Figure 1 11 U1272A rotary switch 39 Figure 1 12 Keys 41 Figure 1 13 Display screen 45 Figure 1 14 Connector terminals 51 Figure 2 1 AC voltage display 57 Figure 2 2 Measuring AC voltage 58 Figure 2 3 AC voltage with LPF display 59 Figure 2 4 DC voltage display
44. 60 Figure 2 5 Measuring DC voltage 62 Figure 2 6 Filter for DC voltage measurements 63 Figure 2 7 AC DC voltage display 64 Figure 2 8 Low Pass Filter LPF for AC DC voltage measurements 65 Figure 2 9 dBm display 66 Figure 2 10 dBV display 67 Figure 2 11 Z ow display 69 Figure 2 12 Qik V display 70 Figure 2 13 Resistance display 71 Figure 2 14 Measuring resistance 72 Figure 2 15 Continuity operation 75 Figure 2 16 Testing for continuity 76 Figure 2 17 Smart Q with bias voltage display 78 Figure 2 18 Measuring leakage current 79 Figure 2 19 Diode display 80 Figure 2 20 Open diode display 81 16 Figure 2 21 Figure 2 22 Figure 2 23 Figure 2 24 Figure 2 25 Figure 2 26 Figure 2 27 Figure 2 28 Figure 2 29 Figure 2 30 Figure 2 31 Figure 2 32 Figure 2 33 Figure 2 34 Figure 2 35 Figure 2 36 Figure 2 37 Figure 2 38 Figure 2 39 Figure 2 40 Figure 3 1 Figure 3 2 Figure 3 3 Figure 3 4 Figure 3 5 Figure 3 6 Figure 3 7 Figure 3 8 Figure 3 9 Figure 3 10 Figure 4 1 Figure 4 2 Figure 4 3 Figure 4 4 Figure 4 5 Figure 4 6 Testing forward bias diode 82 Testing reverse bias diode 83 Auto diode display Good status 85 Auto diode display nGood status 85 Capacitance display 86 Measuring capacitance 87 Temperature display 88 Measuring surface temperature 89 Temperature measurement without ambient compensation 92 DC current display 94 Measuring DC current 95 Measuring AC current 96 Current meas
45. 60 Hz 0 1 1 kQ unbalanced NORMAL MODE REJECTION RATIO NMRR gt 60 dB at 50 60 Hz 0 1 DIMENSIONS W x H x D 92 x 207 x 59 mm WEIGHT U1271A 518 grams with batteries U1272A 520 grams with batteries WARRANTY Please refer to http www keysight com go warranty_terms Three years for the product Three months for the product s standard accessories unless otherwise specified e Please take note that for the product the warranty does not cover Damage from contamination e Normal wear and tear of mechanical components Manuals fuses and standard disposable batteries CALIBRATION CYCLE One year U1271A U1272A User s Guide 155 5 Characteristics and Specifications Specification Assumptions Specification Assumptions Measurement Category 156 Accuracy is given as of reading counts of least significant digit at 23 C 5 C with relative humidity less than 80 RH AC V and AC uA mA A specifications are AC coupled true RMS and are valid from 5 of range to 100 of range The crest factor may be up to 3 0 at full scale except for the 1000 V range where it is 1 5 at full scale For non sinusoidal waveforms add 2 reading 2 full scale typical for crest factors up to 3 After ZLow low input impedance voltage measurements wait at least 20 minutes for thermal impact to cool before proceeding with any other measurement The Keysight U1271A U1272A Handheld Digital Multimete
46. 7 20 1 0 25 2 0 25 2 0 40 30V 0 001 V 0 7 20 1 0 25 2 0 25 2 0 40 300 V 0 01 V 0 7 20 1 0 25 2 0 25 Voltage 1000 V 0 1V 0 7 20 1 0 25 f 1 0 25 LPF low pass filter enabled lt 200 Hz applicable for all voltage ranges 0 7 20 5 0 25 and resolution lt 440 Hz Notes for U1271A AC voltage specifications 1 Overload protection 1000 Vrms For millivolt measurements 1000 Vrms for short circuits with lt 0 3 A current 2 Input impedance 10 MQ nominal in parallel with lt 100 pF U1271A U1272A User s Guide 161 5 Characteristics and Specifications Electrical Specifications Table 5 3 U1271A true rms AC current specifications Accuracy Function Range Resolution Burden voltage 45 Hz to 2 kHz 300 pal 0 01 uA 0 9 25 lt 0 04 V 3000 pal 0 1 uA 0 9 25 lt 0 4 V 30 mal 0 001 mA 0 9 25 lt 0 08 V Current 300 mal IES 0 01 mA 0 9 25 lt 1 00V 3 API 0 0001 A 1 0 25 lt 0 1V 10 API 0 001 A 1 0 25 lt 0 3V Notes for U1271A AC current specifications RrwhDd Overload protection for 300 uA to 300 mA range 0 44 A 1000 V 10 x 35 mm fast acting fuse Overload protection for 3 A to 10 A range 11 A 1000 V 10 x 38 mm fast acting fuse Specification for 300 mA range 440 mA continuous Specification for 10 A range 10 A continuous Add 0 3 to the specified accuracy when measuring signals gt 10 A to 20 A for 30 seconds maximum After measuring cu
47. A U1272A User s Guide U1271A U1272A User s Guide Making Measurements 2 Frequency Test Mode Figure 2 38 Frequency display The frequency of the input signal is shown in the primary display The voltage or ampere value of the signal is shown in the secondary display The bar graph does not indicate frequency but indicates the voltage or ampere value of the input signal Observe the following measurement techniques e If a reading shows as 0 Hz or is unstable the input signal may be below or near the trigger level You can usually correct these problems by manually selecting a lower input range which increases the sensitivity of the multimeter e If a reading seems to be a multiple of what you expect the input signal may be distorted Distortion can cause multiple triggerings of the frequency counter Selecting a higher voltage range might solve this problem by decreasing the sensitivity of the multimeter In general the lowest frequency displayed is the correct one Press to cycle through the frequency pulse width and duty cycle measurements Press for more than 1 second to exit the frequency measurement function 103 2 104 Making Measurements Frequency Test Mode Measuring pulse width The pulse width function measures the amount of time a signal is high or low as shown in Figure 2 37 It is the time from the middle threshold of the rising edge to the middle threshold of the next falling edge The measur
48. AC current measurement AC uA DC current measurement DC uA 1 In this measurement mode the h icon will not appear on the screen regardless of voltage 2 Alternative dual display combination not available for this function 3 When is pressed temperature measurement without ambient compensation MW is enabled U1271A U1272A User s Guide 185 B Dual Display Combinations Using the Dual Key THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK 186 U1271A U1272A User s Guide www keysight com Contact us To obtain service warranty or technical assistance contact us at the following phone or fax numbers United States tel 800 829 4444 fax 800 829 4433 Canada tel 877 8944414 fax 800 746 4866 China tel 800 8100189 fax 800 820 2816 Europe tel 31 20 547 2111 Japan tel 81 426 56 7832 fax 81 426 56 7840 Korea tel 080 769 0800 fax 080 769 0900 Latin America tel 305 269 7500 Taiwan tel 0800 047 866 fax 0800 286 331 Other Asia Pacific Countries tel 65 6375 8100 fax 65 6755 0042 Or visit Keysight World Wide Web at www keysight com find assist Product specifications and descriptions in this document are subject to change without notice Always refer to the English version on the Keysight Web site for the latest revision This information is subject to change without notice Keysight Technologies 2010 2014 Edition 12 December 22 2014 AA KEY
49. C A AC current measurement AC A mA A With the positive probe AC coupling frequency measurement Hz inserted into the A AC current measurement AC A teriinal DC current measurement DC A 0 20 or 4 20 DC A DC current measurement DC Ay DC coupling frequency measurement Hz DC current measurement DC uA a AC current measurement AC uA HA AC coupling frequency measurement Hz AC current measurement AC uA DC current measurement DC uA 1 Alternative dual display combination not available for this function 2 When is pressed temperature measurement without ambient compensation M is enabled U1271A U1272A User s Guide 181 B Dual Display Combinations Using the Dual Key WARNING In the dual display DC voltage decibel and DC voltage measurement mode the h icon will not appear on the screen regardless of voltage Table B 2 U1272A dual display combinations Rotary switch position Function shown when is pressed in the U1272A Primary display Secondary display Low impedance Z gw AC voltage Low impedance Z gw DC voltage wes measurement V measurement V Press amp to switch the function shown on the primary display AC V with the function shown on the secondary display DC V Press again to switch back the functions AC voltage measurement AC V AC coupling frequency measurement Hz AC voltage decibel display dBm is enabled AC voltage measurement AC V when is pressed
50. Keysight U1271A U1272A Handheld Digital Multimeter KEYSIGHT User s Guide TECHNOLOGIES NOTICE This document contains references to Agilent Technologies Agilent s former Test and Measurement business has become Keysight Technologies For more information go to www keysight com KEYSIGHT TECHNOLOGIES Notices Keysight Technologies 2010 2014 No part of this manual may be reproduced in any form or by any means including elec tronic storage and retrieval or translation into a foreign language without prior agree ment and written consent from Keysight Technologies as governed by United States and international copyright laws Manual Part Number U1271 90010 Edition Edition 12 December 22 2014 Keysight Technologies 1400 Fountaingrove Parkway Santa Rosa CA 95403 U1271A U1272A User s Guide Warranty The material contained in this document is provided as is and is subject to change without notice in future editions Further to the maximum extent permitted by the applicable law Keysight disclaims all warranties either express or implied with regard to this manual and any information contained herein including but not limited to the implied warranties of merchantabil ity and fitness for a particular purpose Keysight shall not be liable for errors or for incidental or consequential damages in connection with the furnishing use or performance of this document or of any
51. Multimeter Turn on your multimeter To power ON your multimeter turn the rotary switch to any other position The model number of your multimeter will be shown on the display briefly Figure 1 2 Start up display To power OFF your multimeter turn the rotary switch to the OFF position Automatic power off 26 Your multimeter automatically turns off if the rotary switch is not moved or a key is not pressed for 15 minutes default Pressing any key will turn the multimeter back on after it is powered off automatically To change the timeout period or completely disable the automatic power off refer to Changing the auto power off and backlight timeouts on page 138 U1271A U1272A User s Guide Introduction 1 Preparing Your Multimeter Enabling the backlight If viewing the display becomes difficult in low light conditions press to activate the LCD backlight To conserve battery life a user adjustable timeout controls how long the backlight stays on The default timeout is 15 seconds To change the backlight timeout refer to Changing the auto power off and backlight timeouts on page 138 Selecting the range U1271A U1272A User s Guide The multimeter s selected range is always displayed above the right hand end of the bar graph as the range indicator Pressing switches the multimeter between manual and autoranging It also cycles through the available multimeter ranges when manual ranging is ena
52. S Multimeter Hz ms Tog Range 10A MAX CAT IV 600V CAT Ill 1000V CAT IV 600V FUSED CAT IlI 1000V naa pig E a pay 4k IN AN IN Figure 1 6 Width dimensions U1271A U1272A User s Guide 33 1 Introduction Your Multimeter in Brief Rear and side view Figure 1 7 Height and depth dimensions 34 U1271A U1272A User s Guide Overview U1271A U1272A User s Guide Introduction 1 Your Multimeter in Brief Front panel The front panel parts of your multimeter are described in this section Click the respective Learn more pages for more information on each part i Agilent U1272A 6 Agilent U1271A Q 9 9 Q Figure 1 8 Front panel Table 1 3 Front panel parts Legend Description Learn more on 1 Display screen page 45 2 Keypad page 41 3 Rotary switch for U1271A page 38 4 Terminals page 51 5 Rotary switch for U1272A page 39 35 1 Introduction Your Multimeter in Brief Rear panel The rear panel parts of your multimeter are described in this section Click the respective Learn more pages for more information on each part Figure 1 9 Rear panel Table 1 4 Rear panel parts Legend Description Learn more on 1 Test probe holders 2 IR communication port page 30 3 Battery and fuse access cover page 23 4 Tilt stand page 30 36 U1271A U1272A User s Guide Introduction 1 Your Multimeter in Brief Rotary switch The measurement functions for each ro
53. SB cable from a Keysight Sales Office nearest to you 31 1 Introduction Preparing Your Multimeter Power on options Some options can be selected only while you turn the multimeter on These power on options are listed in the table below To select a power on option press and hold the specified key while turning the rotary switch to any other position OFF to ON Power on options remain selected until the multimeter is turned off Table 1 2 Power on options Key Description Check firmware version The multimeter s firmware guu version will be shown on the primary display Press any key to exit this mode LCD test All annunciators are displayed in the LCD Press any key to exit this mode Smooth is enabled until the multimeter is turned off To permanently enable Smooth see Enabling smooth mode on page 148 Auto Power Off APO is disabled until the multimeter is turned off To permanently disable APO see Changing the auto power off and backlight timeouts on page 138 MaxMin Simulates the Auto Power Off APO mode Press any key to turn the multimeter back on and resume normal operation Hz ms Lo Backlight test LCD backlight is activated Press any key to exit this mode o D e A y o c 32 U1271A U1272A User s Guide Introduction 1 Your Multimeter in Brief Your Multimeter in Brief Dimensions Front view Agilent U1271A True RMS Multimeter True RM
54. SIGHT U1271 90010 TECHNOLOGIES www keysight com
55. Test current Burden g Input Function Range Resolution voltage impedance U1271A U1272A where applicable 30 mV 0 001 mV 0 05 20 10 MQ 300 mV 0 01 mV 0 05 5 0 05 5 10 MQ 3V 0 0001 V 0 05 5 0 05 5 11 11 MQ 30 V 0 001 V 0 05 2 0 05 2 10 1 MQ Voltage 300 V 0 01 V 0 05 2 0 05 2 10 MQ 1000 V 0 1 V 0 05 2 0 05 2 10 MQ Ziow low input impedance enabled applicable for 1 20 f 2kQ 1000 V range and resolution only 2 Notes for DC voltage specifications 1 The accuracy of the 30 mV to 300 mV range is specified after the Null function is used to subtract the thermal effect by shorting the test leads 2 For Z ow measurements autoranging is disabled and the multimeter s range is set to 1000 V in the manual ranging mode 158 U1271A U1272A User s Guide Table 5 1 DC specifications continued Characteristics and Specifications 5 Electrical Specifications Burden Input Accuracy Test current i f d Function Range Resolution voltage impedance U1271A U1272A where applicable 30 Q 0 001 Q 0 2 10 0 65 mA 300 Ql 0 012 0 2 5 0 2 5 0 65 mA 3 kQ 0 0001 KQ 0 2 5 0 2 5 65 uA 30 KQ 0 001 kQ 0 2 5 0 2 5 6 5 uA 300 kQ 0 01 KQ 0 5 5 0 2 5 0 65 yA 93 nA 0 0 3 MQ 0 0001 MQ 0 6 5 0 6 5 iNo Resistance 3g mall 0 001 MQ 1 2 5 1 2 5 93 nA Z7 10 MQ 5 o 93 nA 100 MQ 0 01 MQ 2 0 10 JOMO 2 0 10 lt 100MQ 93nA 300 MaQl l 0 01 MQ 8 0
56. ak nagets 42 U1271A U1272A User s Guide Table 1 7 Keypad functions continued Introduction 1 Your Multimeter in Brief Function when pressed for Legend Less than 1 second More than 1 second Learn more on H Turns the backlight on or off etup Frequency test mode for current or voltage measurements is enabled Press to scroll through the frequency Hz pulse width ms and 3 Log duty cycle measurements In duty cycle and pulse width measurements press e to switch between the positive or negative edge trigger e Press for more than 1 second to exit this mode Enters or exits the Setup mode In the Setup mode press or Q to navigate through the menu pages Press gt or to cycle through the available settings or to edit the existing values e Press to save the new settings or values and exit the editing mode or press E to exit the editing mode without saving e Press for more than 1 second to exit this mode Starts and stops the Data Logging e If data logging is set as HAnd manual data logging pressing for more than 1 second will log the present reading into the memory The display will return to normal after a short while 1 second To manually log another reading press again for more than 1 second If data logging is set as Auto automatic data logging pressing for more than 1 second will enter the automatic data logging mode wher
57. ay 3 Press or to change the timeout period Select oFF to disable the timeout feature Press to save your changes or press i to discard your changes gt Press and hold until the multimeter restarts to return to normal operation 139 4 140 Multimeter Setup Options Setup Menu Items Enabling and disabling the overvoltage alert This setting is used with the multimeter s overvoltage alert see page 28 The multimeter s will start beeping periodically once the measured voltage exceeds the value set regardless of polarity Parameter Range Default setting ALErt 0 1 to 1010 V or Off Off To enable the overvoltage s alert 1 Press for more than 1 second to enter the multimeter s setup menu 2 Press or until ALE is shown on the secondary display Figure 4 10 ALErt display 3 Press or to set the overvoltage alert level Select off to disable the overvoltage alert feature 4 Press to save your changes or press C to discard your changes 5 Press and hold until the multimeter restarts to return to normal operation U1271A U1272A User s Guide Multimeter Setup Options 4 Setup Menu Items Changing the scale range U1271A U1272A User s Guide This setting is used with scale current measurements see page 98 The multimeter converts DC current measurements to a percentage scale readout of 0 to 100 based on the selected range in this menu For example a 25 readout repr
58. ble A 1 Table A 2 Table B 1 Table B 2 Frequency sensitivity and trigger level specifications for voltage measurements 171 Frequency sensitivity specifications for current measurements 171 Peak hold specifications for DC voltage and current measurements 172 U1272A decibel specifications 173 U1272A decibel accuracy specifications for DC voltage measurements 173 Measurement rate approximate 174 U1271A default and shift functions 176 U1272A default and shift functions 177 U1271A dual display combinations 180 U1272A dual display combinations 182 U1271A U1272A User s Guide KEYSIGHT TECHNOLOGIES U1271A U1272A Handheld Digital Multimeter User s Guide 1 Introduction About This Manual 22 Documentation map 22 Safety notes 22 Preparing Your Multimeter 23 Check the shipment 23 Install the batteries 23 Turn on your multimeter 26 Automatic power off 26 Enabling the backlight 27 Selecting the range 27 Alerts and warnings during measurement 28 Adjusting the tilt stand 30 Connecting the IR USB cable 30 Power on options 32 Your Multimeter in Brief 33 Dimensions 33 Overview 35 Rotary switch 37 Keypad 41 Display screen 45 Input terminals 51 Cleaning Your Multimeter 53 This chapter lists the package contents for each multimeter model and teaches you how to set up your multimeter for the first time An introduction to all the features of the multimeter is also given This introduction does not cover all of the capabil
59. ble settings Description Learn more on 4200 Hz 349 Hz Set the multimeter s beep frequency from 3200 Hz to BEEP 3940 Hz 4267 Hz or ofF 4267 Hz or off Default is 3491 Hz ee PraF Enable the MAY for DC AC and AC DC U1272A only page 59 and E LEs dL dCAC or of F L voltage and current measuring paths Default is dC page 131 AHUL G05 to 9999 counts Set the multimeter s AutoHold threshold count from 50 to 9999 counts Default is 500 counts Set the multimeter s data logging option manual log page 115 and page 133 page 116 and l r Ii je d Lou HRad Ruta or Eri G interval log or event log Default is manual log HAnd page 134 Set the logging duration for interval logs from 1 to 99999 etiani H ky ne D000 to 99999 s seconds 1 day 3 hours 46 minutes 39 seconds Default pag L page 135 is 1 second U1272A only Set the multimeter to display voltage as a page 66 and F dli bEL on dBm on dBV or off dB value dBm dBV or off Default is dBm page 136 U1272A only Set the dBm reference impedance value page 66 and nnn e dbr EF GG to 3933 Q from 1 Q to 9999 Q Default is 50 Q page 137 np to 99 minutes or oF F Set the auto power off timeout period from 1 to 99 minutes page 26 and o 1 hour 39 minutes or off Default is 15 minutes page 138 Set the LCD backlight timeout period from 1 to 99 seconds page 27 and me bur t Gi to 39 s or oF F 1 minute 39 seconds or off Default i
60. bled Autoranging is convenient because the multimeter automatically selects an appropriate range for sensing and displaying each measurement However manual ranging results in better performance since the multimeter does not have to determine which range to use for each measurement The range is fixed for diode tests temperature Qik V and Z gw measurements In autorange the multimeter selects the lowest range to display the highest available precision resolution for the input signal If manual range is already enabled press 0 for more than 1 second to enter the autoranging mode If autoranging is enabled press to enter the manual range mode Each additional press of 3 sets the multimeter to the next higher range unless it is already in the highest range at which point the range switches to the lowest range 27 1 28 Introduction Preparing Your Multimeter Alerts and warnings during measurement Voltage alert For your own safety please do not ignore the voltage alert When the multimeter cautions you with a voltage alert immediately remove the test leads from the source being measured CAUTION Your multimeter provides a voltage alert for voltage measurements in both autoranging and manual range modes The multimeter starts beeping periodically once the measured voltage exceeds the ALErt value regardless of polarity set in the Setup mode Immediately remove the test leads from the source bei
61. de 177 A Shift Functions Using the Shift Key Table A 2 U1272A default and shift functions continued Rotary switch position Function shown in the primary display U1272A Default When is pressed ay AC current measurement AC uA ak DC current measurement DC uA H AC DC current measurement AC DC uA 1 Press amp to switch the function shown in the primary display AC V with the function shown in the secondary display DC V Press again to switch back the displays 178 U1271A U1272A User s Guide KEYSIGHT TECHNOLOGIES U1271A U1272A Handheld Digital Multimeter User s Guide Appendix B Dual Display Combinations Using the Dual Key Table B 1 U1271A dual display combinations 180 Table B 2 U1272A dual display combinations 182 The tables below list the function shown in the secondary display when the key is pressed with respect to the multimeter s rotary switch position Press to cycle through the available dual display combinations Press for more than 1 second to return to the default secondary display function ambient temperature measurement B Dual Display Combinations Using the Dual Key Table B 1 U1271A dual display combinations Rotary switch position Function shown when E is pressed in the U1271A Primary display Secondary display AC voltage measurement AC V DC voltage measurement AC V Nw Iz Qik V Press amp to switch the function shown on the primary display AC V wit
62. domestic household waste SB US The CSA mark is a registered trademark of the Canadian Standards Association 4 This symbol indicates the time period during which no hazardous or toxic substance elements are expected to leak or deteriorate during normal use Forty years is the expected useful life of the product U1271A U1272A User s Guide Waste Electrical and Electronic Equipment WEEE Directive 2002 96 EC U1271A U1272A User s Guide This instrument complies with the WEEE Directive 2002 96 EC marking requirement This affixed product label indicates that you must not discard this electrical or electronic product in domestic household waste Product Category With reference to the equipment types in the WEEE directive Annex 1 this instrument is classified as a Monitoring and Control Instrument product The affixed product label is as shown below Do not dispose in domestic household waste To return this unwanted instrument contact your nearest Keysight Service Centre or visit www keysight com environment product for more information Declaration of Conformity DoC 10 The Declaration of Conformity DoC for this instrument is available on the Keysight Web site You can search the DoC by its product model or description at the Web address below http regulations products keysight com DoC search htm If you are unable to search for the respective DoC pleas
63. e 86 and e Capacitor is discharging during page 101 u capacitance measurement e Negative slope for pulse width ms and duty cycle measurements Apapa Primary measurement display O m O FC dBnsms Measurin i i i g units for the primary display page 49 MVAF MkQHz 31000RMAV Measurement range selected page 27 ose Battery capacity indication page 25 47 1 48 Introduction Your Multimeter in Brief Table 1 8 General annunciators Legend APO I 90 2 a hunt Auto gt t jysmoot 82 ae abantail Description Learn more on APO Auto Power Off enabled page 26 Tone enabled Analog bar graph page 50 Autoranging enabled or Auto diode enabled page 27 Diode test selected page 80 Smooth mode enabled pores Overload the reading exceeds the display range U1271A U1272A User s Guide Introduction 1 Your Multimeter in Brief Measurement units The available signs and notations for each measurement function in your multimeter are described in Table 1 9 The units listed below are applicable to the primary display and secondary display measurements of your multimeter Table 1 9 Measurement units display Sign Notation Description M k m dBm dBV mV V A mA pA nF uF mF Q kQ MQ MHz kHz Hz ms c F S Mega 1E 06 1000000 kilo 1E 03 1000 nano 1E 09 0 000000001 micro 1E 06 0 000001 milli 1E 03 0 001 Decibel unit relative to 1 mW
64. e contact your local Keysight representative U1271A U1272A User s Guide Table of Contents U1271A U1272A User s Guide Introduction About This Manual 22 Documentation map 22 Safety notes 22 Preparing Your Multimeter 23 Check the shipment 23 Install the batteries 23 Turn on your multimeter 26 Automatic power off 26 Enabling the backlight 27 Selecting the range 27 Alerts and warnings during measurement 28 Adjusting the tilt stand 30 Connecting the IR USB cable 30 Power on options 32 Your Multimeter in Brief 33 Dimensions 33 Overview 35 Rotary switch 37 Keypad 4 Display screen 45 Input terminals 51 Cleaning Your Multimeter 53 Making Measurements Crest Factor 56 Measuring AC Voltage 57 Using the LPF Low Pass Filter Function for AC measurements 59 12 Measuring DC Voltage 60 Using the Filter Function for DC measurement 63 Measuring AC and DC Signals U1272A only 64 Using the LPF Low Pass Filter Function for AC DC measurements 65 Making dB Measurements U1272A only 66 Using Z gw for Voltage Measurements U1272A only 68 Using Qik V for Voltage Measurements U1271A only 70 Measuring Resistance 71 Measuring Conductance 73 Testing for Continuity 74 Using Smart Q for Resistance Measurements U1272A only 77 Testing Diodes 80 Using Auto diode for Diode Tests U1272A only 84 Measuring Capacitance 86 Measuring Temperature 88 Measuring AC or DC Current 93 Scale of 4 20 mA or 0 20
65. e data is logged at the interval defined in the multimeter s Setup If data logging is set as tri amp event data logging pressing for more than 1 second will enter the event data logging mode where data is logged each time a triggering condition is satisfied e Press for more than 1 second to exit the automatic or event data logging mode page 27 and page 125 page 101 and page 116 U1271A U1272A User s Guide 43 1 Introduction Your Multimeter in Brief Table 1 7 Keypad functions continued Function when pressed for Legend Learn Less than 1 second More than 1 second more on Sets a manual range and disables autoranging Press again to cycle through each available measurement range e During temperature measurements if Celsius Fahrenheit C 9F or page 27 Fahrenheit Celsius 9F C is selected as Enables autoranging and the default temperature unit pressing page 90 changes the temperature measurement unit between Celsius C and Fahrenheit F See Changing the default temperature unit on page 90 for more information Enters the Log Review menu Press Gi again to cycle through the previously recorded manual H interval Switches between the regular and shifted A or event E logging data measurement function icon printed in Press or to view first or page 37 exe S35 orange above the rotary switch position if last logged data respectively Press and ava
66. e equipment under test disconnect circuit power and discharge all high voltage capacitors before measuring capacitance Use the DC voltage function to confirm that the capacitor is fully discharged NOTE The multimeter measures capacitance by charging the capacitor with a known current for a known period of time measuring the resulting voltage and then calculating the capacitance 1 To measure capacitance position the rotary switch to and set up your multimeter as shown in Figure 2 26 2 Probe the test points and read the display F is shown on the bottom left of the display when the capacitor is charging and J is shown when the capacitor is discharging Figure 2 25 Capacitance display To improve measurement accuracy of small value capacitors press C with the test leads open to subtract the residual capacitance of the multimeter and leads U1271A U1272A User s Guide Making Measurements 2 Measuring Capacitance For measuring capacitance values greater than 1000 uF discharge the capacitor first then select a suitable range for measurement This will speed up the measurement time and also ensure that the correct capacitance value is obtained Sii Agilent U1272A True RMS Multimeter Anul Scale Dal CAT IV 600V CAT Ill 1000V 10A MAX FUSED 44omA F FUSED F A HA mA Figure 2 26 Measuring capacitance U1271A U1272A User s Guide 87 2 Making Measurements Measuring Temperature Measuring
67. e fully understood and met U1271A U1272A User s Guide Introduction 1 Preparing Your Multimeter Preparing Your Multimeter Check the shipment When you receive your multimeter check the shipment according to the following procedure 1 Inspect the shipping container for damage Signs of damage may include a dented or torn shipping container or cushioning material that indicates signs of unusual stress or compacting Save the packaging material in case the multimeter needs to be returned 2 Carefully remove the contents from the shipping container and verify that the standard accessories and your ordered options are included in the shipment according to the Included Accessories list located at the side of the box 3 For any question or problems refer to the Keysight contact numbers on the back of this manual Install the batteries CAUTION Your multimeter is powered by four 1 5 V AAA alkaline batteries included with the shipment When you receive your multimeter the AAA alkaline batteries are not installed Use the following procedure to install the batteries Before you proceed with the batteries installation remove all cable connections to the terminals and ensure that the rotary switch is at the OFF position Use only the battery type specified in the Product Characteristics on page 154 U1271A U1272A User s Guide 23 1 24 Introduction Preparing Your Multimeter Open the battery
68. e table below shows the general environmental requirements for this instrument Environmental conditions Requirements Operating temperature Full accuracy from 20 C to 55 C Full accuracy up to 80 RH relative Operating humidity humidity for temperature up to 30 C decreasing linearly to 50 RH at 55 C Storage temperature 40 C to 70 C Altitude Up to 2000 meters Pollution degree Pollution degree II The U1271A U1272A Handheld Digital Multimeter complies with the following safety and EMC requirements EN IEC 61010 1 2001 e ANSI UL 61010 1 2004 CAN CSA C22 2 No 61010 1 04 Commercial limits compliance with EN61326 1 U1271A U1272A User s Guide Regulatory Markings CE The CE mark is a registered trademark of the European Community This CE mark shows that the product complies with all the relevant European Legal N10149 The C tick mark is a registered trademark of the Spectrum Management Agency of Australia This signifies compliance with the Australia EMC Framework ISM IA Directives regulations under the terms of the Radio Communication Act of 1992 er This instrument complies with the eS EE nes es aes it WEEE Directive 2002 96 EC marking device complies with the Canadian requirement This affixed product label ICES NMB 001 ICES 001 i Cet appareil ISM est confomre a la norme NMB 001 du Canada indicates that you must not discard this electrical or electronic product in
69. easurements Measuring AC or DC Current Scale of 4 20 mA or 0 20 mA The 4 20 mA current loop output from a transmitter is a type of electrical signal that is used in a series circuit to provide a robust measurement signal that is proportional to the applied pressure temperature or flow in process control The signal is a current loop where 4 mA represents the zero percent signal and 20 mA represents the 100 percent signal The scale for 4 20 mA or 0 20 mA in this multimeter is calculated using its corresponding DC mA measurement The multimeter will automatically optimize the best resolution for the selected measurement Two ranges are available for the scale as shown in Table 2 3 To display the current measurement in scale 1 Position your multimeter s rotary switch position to z Set up your multimeter to measure DC current by following the steps listed in the Measuring AC or DC Current section 2 Press 3 until Yy gm or mm is shown on the right side of the display Probe the test points and read the display Figure 2 34 4 20 mA Scale display The analog bar graph displays the current measurement value In the example above 8 mA is represented as 25 in the 4 20 mA scale U1271A U1272A User s Guide U1271A U1272A User s Guide Making Measurements 2 Measuring AC or DC Current Table 2 3 Scale measurement range Scale of 4 20 mA or 0 20 mA DC mA measurement range 999 99 30 mA o
70. ecision multimeter with 1 nA or 0 1 nA or a precision shunt you can measure the leakage current using the Smart function with just a resistor from 100 kQ to 300 kQ Agilent U1272A Figure 2 18 Measuring leakage current U1271A U1272A User s Guide 79 2 Making Measurements Testing Diodes Testing Diodes CAUTION To avoid possible damage to your multimeter or to the equipment under test disconnect the circuit power and discharge all high voltage capacitors before testing diodes NOTE Use the diode test to check diodes transistors silicon controlled rectifiers SCRs and other semiconductor devices A good diode allows current to flow in one direction only This test sends a current through a semiconductor junction and then measures the junction s voltage drop A typical junction drops 0 3 V to 0 8 V 1 To test a diode out of a circuit position the rotary switch to gt gt ato and set up your multimeter as shown in Figure 2 21 2 Probe the test points and read the display Connect the red test lead to the positive terminal anode of the diode and the black test lead to the negative terminal cathode The cathode of a diode is indicated with a band Figure 2 19 Diode display U1271A U1272A User s Guide Making Measurements 2 Testing Diodes Your multimeter can display diode forward bias of up to approximately 3 1 V The forward bias of a typical diode is within the range of 0 3 V to 0 8 V
71. ed waveform must be periodic its pattern must repeat at equal time intervals 1 To measure pulse width position the rotary switch to one of the functions allowing frequency measurements shown in Figure 2 36 2 Press until the measurements are shown in the millisecond ms unit Probe the test points and read the display Figure 2 39 Pulse width display The pulse width of the input signal is shown in the primary display The voltage or ampere value of the signal is shown in the secondary display The bar graph does not indicate duty cycle but indicates the voltage or ampere value of the input signal The pulse width polarity is displayed to the left of the duty cycle value F indicates a positive pulse width and H indicates a negative pulse width To change the polarity being measured press Press to cycle through the frequency pulse width and duty cycle measurements U1271A U1272A User s Guide Making Measurements 2 Frequency Test Mode Press for more than 1 second to exit the pulse width measurement function Measuring duty cycle U1271A U1272A User s Guide The duty cycle or duty factor of a repetitive pulse train is the ratio of the positive or negative pulse width to the period expressed as a percentage as shown in Figure 2 37 The duty cycle function is optimized for measuring the on or off time of logic and switching signals Systems such as electronic fuel injection systems and switching power supplies
72. en measuring AC voltage or AC frequency 1 2 Rotate the multimeter s rotary switch to y Milxy Press CEJ to activate the low pass filter function E Your multimeter continues measuring in the chosen AC mode but now the signal diverts through a filter that blocks unwanted voltages above 1 kHz Figure 2 3 AC voltage with LPF display To avoid possible electric shock or personal injury do not use the Low Pass Filter option to verify the presence of hazardous AC voltages AC voltage values greater than what are indicated may be present when the Low Pass Filter is enabled First make an AC voltage measurement with the filter OFF to detect the possible presence of hazardous voltages Then select the filter function if required for measurement stability and response speed U1271A U1272A User s Guide The low pass filter can improve measurement performance on composite sine waves that are typically generated by inverters and variable frequency motor drives 59 2 Making Measurements Measuring DC Voltage Measuring DC Voltage This multimeter displays DC voltage values as well as their polarity Negative DC voltages will return a negative sign on the left of the display 1 To measure a DC voltage with your multimeter rotate the rotary switch to F 7 or W inm and set up your multimeter as shown in Figure 2 4 Probe the test points and read the display Figure 2 4 DC voltage display NOTE l 60 For
73. er that blocks unwanted voltages above 1 kHz Figure 2 8 Low Pass Filter LPF for AC DC voltage measurements U1271A U1272A User s Guide 65 2 Making Measurements Making dB Measurements U1272A only Making dB Measurements U1272A only Your multimeter is capable of displaying voltage as a dB value either relative to 1 milliwatt dBm or a reference voltage of 1 volt dBV Displaying dBm values A dBm measurement must use a reference impedance resistance to calculate a dB value based on 1 milliwatt The reference impedance is set to 50 Q by default To select another reference value see the Setting a custom dBm reference impedance U1272A only on page 137 1 To set the multimeter to display values in dBm first set pais A S the rotary switch to y lin 7 or 7 2 Press until the voltage measurements are displayed as a dBm value as shown in Figure 2 9 Figure 2 9 dBm display Press for more than 1 second to exit the dBm function Selecting the frequency test mode J also cancels the dBm function 66 U1271A U1272A User s Guide U1271A U1272A User s Guide Making Measurements 2 Making dB Measurements U1272A only Displaying dBV values A dBV measurement uses a 1 volt reference voltage to compare the present measurement against a stored relative value The difference between the two AC signals is displayed as a dBV value The reference impedance setting is not part of a dBV measurement 1
74. esents a DC current of 8 mA on the 4 20 mA scale or a DC current of 5 mA on the 0 20 mA scale Parameter Range Default setting PErCEn 4 20 mA 0 20 mA or Off 4 20 mA To change the scale range 1 Press for more than 1 second to enter the multimeter s setup menu 2 Press 43 lt or until PE Epn is shown on the secondary display Figure 4 11 PErCEn display 3 Press or to change the scale range Select gFF to disable the scale readout 4 Press to save your changes or press CEJ to discard your changes 5 Press and hold until the multimeter restarts to return to normal operation 141 4 142 Multimeter Setup Options Setup Menu Items Changing the thermocouple type U1272A only This setting is used with temperature measurements see page 88 Select a thermocouple type that matches the thermocouple sensor you are using for temperature measurements Parameter Range Default setting CoUPLE tYPE K or tYPE J tYPE K To change the thermocouple type 1 Press for more than 1 second to enter the multimeter s setup menu 2 Press or until oi PLE is shown on the secondary display Figure 4 12 CoUPLE display 3 Press or to change the thermocouple type 4 Press to save your changes or press CEJ to discard your changes 5 Press and hold until the multimeter restarts to return to normal operation U1271A U1272A User s Guide Multimeter Setup Options 4 Setup Menu Items
75. eturn to normal operation 144 U1271A U1272A User s Guide Multimeter Setup Options 4 Setup Menu Items Changing the data bits This setting changes the number of data bits data width for remote communications with a PC The number of stop bit is always 1 and this cannot be changed Parameter Range Default setting dAtAb 8 bit or 7 bit 8 bit To change the data bit 1 Press for more than 1 second to enter the multimeter s setup menu 2 Press or until dAkAb is shown on the secondary display Figure 4 15 dAtAb display 3 Press or to change the data bit 4 Press to save your changes or press CEJ to discard your changes 5 Press and hold until the multimeter restarts to return to normal operation U1271A U1272A User s Guide 145 4 Multimeter Setup Options Setup Menu Items Changing the parity check This setting changes the parity check for remote communications with a PC Parameter Range Default setting PAritY nonE En or odd nonE To change the data bit 1 Press for more than 1 second to enter the multimeter s setup menu 2 Press or until PAr LY is shown on the secondary display Figure 4 16 PAritY display 3 Press or to change the parity check 4 Press to save your changes or press te to discard your changes 5 Press and hold until the multimeter restarts to return to normal operation 146 U1271A U1272A User s Guide Multimeter Setup Options 4 Setup Menu Items
76. f the interval log entries will lead to the decrease of the maximum entries for the event log and vice versa See the Reviewing Previously Recorded Data View section later in this manual to review or erase the recorded entries When the interval log recording session is running all other keypad operations are disabled except for which when pressed for more than 1 second will stop and exit the recording session Furthermore APO auto power off is disabled during the recording session U1271A U1272A User s Guide 119 3 120 Multimeter Features Recording Measurement Data Data Logging Performing event logs triG Ensure that r G is selected as the data logging option in the multimeter s Setup Event logs are used only with the following modes e TrigHold and AutoHold page 115 e MaxMin recording page 112 e Peak recording page 114 Event records are triggered by the measured signal satisfying a trigger condition set by the measurement function used in the following modes Table 3 3 Event log trigger conditions Modes Trigger condition The input signal value is recorded TrigHold Each time G3 is pressed AutoHold When the input signal varies more than the variation count MaxMin When a new maximum or minimum value is recorded The average and present readings are not recorded in the Event log Peak When a new peak maximum or minimum value is recorded Start the event log
77. firmware version 2 00 and below the Filter function is switched off by default Customers are advised to update their products to the latest firmware version to take advantage of the latest safety features and measurement improvements Press to cycle through the available dual display combinations See Appendix B Dual Display Combinations Using the Dual Key starting on page 179 to learn more Press to enable the frequency test mode for voltage measurements See Frequency Test Mode on page 101 to learn more U1271A U1272A User s Guide Making Measurements 2 Measuring DC Voltage CAUTION For measuring AC voltage signals with a DC offset refer to the Measuring AC and DC Signals U1272A only on page 64 e For measuring DC voltage from a mixed signal in DC measurement mode ensure that the Filter is enabled Refer to Enabling and disabling the Filter on page 131 To avoid possible electric shock or personal injury enable the Low Pass Filter to verify the presence of hazardous DC voltages Displayed DC voltage values can be influenced by high frequency AC components and must be filtered to assure an accurate reading U1271A U1272A User s Guide 61 62 2 Making Measurements Measuring DC Voltage Agilent U1272A True RMS Multimeter Hz ms Tor gt Range Ai 10A MAX CAT IV 600v FUSED ak CAT Il 1000V m m FUSED anes A HA mA COM OO Figure 2 5 Measuring DC voltage U127
78. g is used with dB measurements see page 66 The dBm function is logarithmic and is based on a calculation of power delivered to a reference impedance resistance relative to 1 mW Parameter Range Default setting dbrEF 1 to 9999 Q 50 Q 137 4 138 Multimeter Setup Options Setup Menu Items To change the dBm reference impedance value 1 Press for more than 1 second to enter the multimeter s setup menu 2 Press or until dbrEF is shown on the secondary display Figure 4 7 dbrEF display 3 Press or to set the dBm reference impedance value 4 Press to save your changes or press CEJ to discard your changes 5 Press and hold until the multimeter restarts to return to normal operation Changing the auto power off and backlight timeouts The multimeter s automatic power off see page 26 and backlight see page page 27 features use timers to determine when to turn off the backlight and when to automatically turn the multimeter off Parameter Range Default setting APo 1 to 99 minutes or Off 15 minutes bLit 1 to 99 s or Off 15s U1271A U1272A User s Guide U1271A U1272A User s Guide Multimeter Setup Options 4 Setup Menu Items To change the auto power off and backlight timeout periods 1 Press for more than 1 second to enter the multimeter s setup menu 2 Press or until Afo or bl E is shown on the secondary display Figure 4 8 APo display Figure 4 9 bLit displ
79. h the function shown on the secondary display DC V Press again to switch back the functions AC voltage measurement AC V Y AC voltage measurement AC V with low AC coupling frequency measurement Hz pass filter LPF AC voltage measurement AC mV mal AC voltage measurement AC mV with low AC coupling frequency measurement Hz pass filter LPF T DC voltage measurement DC V DC coupling frequency measurement Hz mv DC voltage measurement DC mV DC coupling frequency measurement Hz Resistance measurement Q Ambient temperature c o Ba j Continuity test m Q Press to switch between the short or open state gt Diode test V Ambient temperature ec Capacitance measurement F Ambient temperature ec 3 Temperature measurement C or F Ambient temperature ec DC coupling frequency measurement Hz P DC current measurement DC mA FA AC current measurement AC mA mA With the positive probe inserted into the HA mA terminal AC current measurement AC mA 0 20 or 4 20 DC mA AC coupling frequency measurement Hz DC current measurement DC mA DC current measurement DC mA 180 U1271A U1272A User s Guide Dual Display Combinations Using the Dual Key B Table B 14 U1271A dual display combinations continued Rotary switch position Function shown when e is pressed in the U1271A Primary display Secondary display DC coupling frequency measurement Hz DC current measurement D
80. hanges or press ae to discard your changes 151 4 Multimeter Setup Options Setup Menu Items 5 Press or to continue browsing through the other menu items or press and hold until the multimeter restarts to return to normal operation CAUTION Always set the temperature unit display per the official requirements and in compliance with the National laws of your region 152 U1271A U1272A User s Guide KEYSIGHT TECHNOLOGIES U1271A U1272A Handheld Digital Multimeter User s Guide 5 Characteristics and Specifications Product Characteristics 154 Specification Assumptions 156 Measurement Category 156 Measurement category definition 156 Electrical Specifications 158 DC specifications 158 AC specifications 161 AC DC specifications for U1272A 165 Capacitance specifications 167 Temperature specifications 168 Frequency specifications 169 Duty cycle and pulse width specifications 169 Frequency sensitivity specifications 171 Peak hold specifications 172 Decibel dB specifications for U1272A 173 Measurement rate approximate 174 This chapter lists the characteristics assumptions and specifications of the U1271A and U1272A handheld digital multimeters 5 Characteristics and Specifications Product Characteristics Product Characteristics 154 Product characteristics specified in the table below are applicable for both U1271A and U1272A models unless stated otherwise POWER SUPPLY Battery type 4x 1 5
81. hat e Press J while the ERI symbol is and has been saved The display will return flashing to save the selected ratio and page 110 to normal after 3 seconds unit and to start the conversion or Pressing 2 while the relative value While the E3 symbol is flashing if is being displayed will cancel the Null no activity is detected after 3 seconds mode the conversion will begin with the specified ratio and unit shown on the primary display Press L amp V for more than 1 second to cancel the Scale transfer mode Starts and stops the bein recording Starts and stops the Peak recording i aes CaP 9D again e cyce tirough Press lt again to switch between 2 maximum Max minimum Min page 11 MaxMin the maximum Gf Max and Peak lt average Avg and present par F and minimum GEE Min peak readings MaxMinAvg readings e Press for more than 1 second to page ii Press for more than 1 second to aie en exit this mode exit this mode Freezes the present reading in the display Rehan Wiemann m E ndo E mode g eae In TrigHold mode press SP to In AutoHold mode the reading is updated automatically once the reading manually trigger the holding of the next aaa page 115 is stable and the count setting is measured value exceed d i aes E for more than 1 second to Press G3 for more than 1 second to exit this mode were exit this mode Switches between the dual combination Exits the Hold Null MaxMin Pe
82. il SAaotH is shown on the secondary display Figure 4 18 SMootH display 3 Press or to set the Smooth refresh rate To permanently enable Smooth change the last digit shown from g disabled to E enabled 4 Press to save your changes or press CE to discard your changes U1271A U1272A User s Guide Multimeter Setup Options 4 Setup Menu Items 5 Press and hold until the multimeter restarts to return to normal operation Changing the user scale conversion value and unit You can set the user scale conversion value and unit The ratio can be set from 0000 1 to 1000 0 and the unit can be set to V V A V or 000 no unit V The default is 1000 V V See Making Scale Transfers Scale on page 110 for more information on the Scale operation Parameter Range Default setting Scale USEr 0000 1 to 1000 0 V V A V or 1000 0 V V 000 no unit V To set the user scale conversion value and unit 1 Press for more than 1 second to enter the multimeter s setup menu 2 Press lt or until iE is shown on the secondary display Figure 4 19 SMootH display 3 Press or to set the scale conversion value Move the cursor to the unit indicator right most to change the scale conversion unit U1271A U1272A User s Guide 149 4 150 Multimeter Setup Options Setup Menu Items 4 Press to save your changes or press c to discard your changes 5 Press and hold until the multimeter restarts to
83. ilable Press again to switch back or to scroll through the logged data page 122 to the regular measurement function e Press for more than 1 second to clear all the logged data for the selected logging mode Press G4 for more than 1 second to exit this mode 44 U1271A U1272A User s Guide Introduction 1 Your Multimeter in Brief Display screen U1271A U1272A User s Guide The display annunciators of your multimeter are described in this section See also Measurement units on page 49 for a list of available measurement signs and notations and Analog bar graph on page 50 for a tutorial on the analog bar graph located at the bottom of your display screen General display annunciators The general display annunciators of your multimeter are described in the table below Click the respective Learn more pages for more information on each annunciator Figure 1 13 Display screen Table 1 8 General annunciators Legend Description Learn more on Remote control enabled page 30 A tale Q for resistance saw Data logging in progress page 116 EI Scale transfer enabled page 110 VEN View mode for reviewing previously logged page 122 data 45 1 Introduction Your Multimeter in Brief Table 1 8 General annunciators Legend Description Learn more on 666688 Q kHz MVAS 4 a Hold Auto La ErMax mMin Max Min Avg MaxMin Avg A n Secondary meas
84. ities of the multimeter but gives basic examples to help you perform basic operations on your multimeter 1 Introduction About This Manual About This Manual 22 Documentation map Safety notes CAUTION The following manuals and software are available for your multimeter For the very latest version please visit our Web site at http www keysight com find hhTechLib Check the manual revision on the first page of each manual e User s Guide This manual e Quick Start Guide Printed copy for outdoor use included with shipment e Service Guide Free download at the Keysight Web site Keysight GUI Data Logger Software Help and Quick Start Guide Free download at the Keysight Web site The following safety notes are used throughout this manual Familiarize yourself with each of the notes and its meaning before operating your multimeter More pertinent safety notes for using this product are located under the Safety Symbols section Caution denotes a hazard It calls attention to a procedure that if not correctly performed or adhered to could result in damage to or destruction of the product Do not proceed beyond a caution notice until the indicated conditions are fully understood and met Warning denotes a hazard It calls attention to a procedure which if not correctly performed or adhered to could result in injury or loss of life Do not proceed beyond a warning note until the indicated conditions ar
85. its maximum reach To PC host IR USB cable Pull until maximum reach Figure 1 4 Tilt stand adjustment and IR cable connection Connecting the IR USB cable You can use the IR communication link IR communication port located at the rear panel and the Keysight GUI Data Logger software to control your multimeter remotely perform data logging operations and transfer the contents of your multimeter s memory to a PC Ensure that the Keysight logo on the U1173A IR USB cable purchased separately connected to the multimeter is facing up Firmly push the IR head into the multimeter s IR communication port until it snaps into place see Figure 1 4 30 U1271A U1272A User s Guide U1271A U1272A User s Guide Introduction 1 Preparing Your Multimeter Refer to the Keysight GUI Data Logger Software Help and Quick Start Guide for more information on the IR communication link and the Keysight GUI Data Logger software i a Looga BFP sae wove By nenons Dow Pd opins l P aA chia RN Data Logging Table Graphs Virtual Meter Memoy Square wave program Auto Power Off O Disable O Enable 1 minute te Controle amp Update Command Send Command Dual Off Figure 1 5 Keysight GUI Data Logger Software The Keysight GUI Data Logger software and its supporting documents Help and Quick Start Guide are available for free download at http www keysight com find hhTechLib You may purchase a U1173A IR U
86. le the frequency test mode for voltage measurements See Frequency Test Mode on page 101 to learn more 94 U1271A U1272A User s Guide Making Measurements 2 Measuring AC or DC Current CAUTION Placing the probes across in parallel with a powered circuit when a lead is plugged into a current terminal can damage the circuit you are testing and blow the multimeter s fuse This happens because the resistance through the multimeter s current terminals are very low resulting in a short circuit Agilent U1272A True RMS Multimeter 10A MAX CAT IV 600V CAT Ill 1000V FUSED 440mA le FUSED J HA mA Figure 2 31 Measuring DC current U1271A U1272A User s Guide 95 96 2 Making Measurements Measuring AC or DC Current Agilent U1272A True RMS Multimeter He ms Tor gt Range Ai 10A MAX CAT IV 600V FUSED CAT Ill 1000V 440mA Figure 2 32 Measuring AC current U1271A U1272A User s Guide Agilent U1272A True RMS Multimeter Anul i Scale Trig A Hoia A CATIV 600V GAT IIl 1000V U1271A U1272A User s Guide Agilent U1272A True RMS Multimeter Anul Scalo Trig A Hoi A 10A MAX CATIV 600V FUSED E 440mA F FUSED A Ne Figure 2 33 Current measurement setup Making Measurements 2 Measuring AC or DC Current Agilent U1272A True RMS Multimeter Tig Kay Hold CATIV 600V 10A MAX FUSED PERA CAT Ill 1000V mi mE gerry 97 Making M
87. lter for DC coupling of voltage and or current measurements The icon will be shown during the measurement Table 4 4 Firmware version 2 00 or older Parameter Range Default setting FiLtEr on or oFF oFF Table 4 5 Firmware version 2 04 or newer Parameter Range Default setting FiLtEr dC dCAC or oF F dC To avoid possible electric shock or personal injury enable the Filter LPF to verify the presence of hazardous DC voltages Displayed DC voltage values can be influenced by high frequency AC components and must be filtered to assure an accurate reading 132 U1271A U1272A User s Guide Multimeter Setup Options 4 Setup Menu Items To enable disable the Filter 1 Press for more than 1 second to enter the multimeter s setup menu 2 Press or until F LEEr is shown on the secondary display Figure 4 2 FiLtEr display 3 Press or to enable the filters an is selected Select gff to disable the filters 4 Press to save your changes or press CE to discard your changes 5 Press and hold until the multimeter restarts to return to normal operation Changing the variation count U1271A U1272A User s Guide This setting is used with the multimeter s AutoHold feature see page 115 When the variation of the measured value exceeds the value of the variation count the AutoHold feature will be ready to trigger Parameter Range Default setting AHoLd 50 to 9999 counts 500 counts
88. ments Null NOTE In resistance measurement the multimeter will read a non zero value even when the two test leads are in direct contact because of the resistance of these leads Use the null function to zero adjust the display e For DC voltage measurements the thermal effect will influence the accuracy of the measurements Short the test leads and press when the displayed value is stable to zero adjust the display Press L _ to enable the Null function Display returns to normal after 3 seconds Press Press C again to disable the Null function Figure 3 2 Null operation U1271A U1272A User s Guide 109 3 Multimeter Features Making Scale Transfers Scale Making Scale Transfers Scale 110 The Scale operation emulates a transducer by helping you to convert the measured readings proportionally to the specified ratio and unit display Use Scale to transfer voltage readings to proportional readings when using clamp on current probes or high voltage probes The available scale conversions are shown in the table below Table 3 1 Available scale conversions Scale conversion Multiplier Unit Related units 1 kv vel 1000 V V 1000 0 Vv V kV 1 A mV 1000 A V 1000 0 A A kA 1A 10 mV 100A V 100 0 A A kA 1A 100mV 10A V 10 0 A mA A kA 1 The transfer formula used is Display Multiplier x Measurement 2 This value and unit can be adjusted from the multimeter s Setup See Changing the u
89. mum recording time is 99 59 59 hh mm ss JL is shown if the recording exceeds the maximum time Press for more than 1 second to disable the MaxMin function This mode is useful for capturing intermittent readings recording minimum and maximum readings unattended or recording readings while equipment operation keeps you from observing the multimeter display The true average value displayed is the arithmetic mean of all readings taken since the start of recording The average reading is useful for smoothing out unstable inputs calculating power consumption or estimating the percentage of time a circuit is active 113 3 Multimeter Features Capturing Peak Values Peak Capturing Peak Values Peak 114 NOTE This function allows the measurement of peak voltage for analysis of such components as power distribution transformers and power factor correction capacitors MaxMin 1 To activate the peak mode press the key for more than 1 second MaxMin 2 Press C lt again to display the maximum HoldMax or minimum HoldMin peak values along with their respective time stamps Figure 3 5 Peak display 3 If L overload is shown press the key to change the measurement range This action will also restart the recording session 4 Press to restart the recording session without changing the measurement range 5 Press or for more than 1 second to disable the Peak function When the peak value of the input
90. n continuity a short means a measured value is less that the threshold resistance values listed in Table 2 1 Table 2 1 Threshold resistance values Measuring range Threshold resistance 30 000 Q lt 25 10 Q 300 00 Q lt 25 10 Q 3 0000 kQ lt 250 100 Q 30 000 kQ lt 2 5 1 kQ 300 00 kQ lt 25 10 kQ 3 0000 MQ lt 120 60 kQ 30 000 MQ lt 120 60 kQ 300 00 MQ lt 120 60 kQ You can set the beeper to sound and the backlight to flash as a continuity indication whether the circuit under test is less than short or more than or equal to open the threshold resistance U1271A U1272A User s Guide U1271A U1272A User s Guide Making Measurements 2 Testing for Continuity Press to switch between short and open states for checking normal open _ _ and normal close contacts 1 To perform a continuity test position the rotary switch to dsmata g and set up your multimeter as shown in Figure 2 16 2 Press a to enable the continuity test function 3 Press to switch between the short and open state Press to enable the continuity test function Press to switch between the short and open states Circuit open Open detected beeper sounds 4 Start to capture Short detected beeper sounds Circuit complete Figure 2 15 Continuity operation 4 Probe the test points and read the display The continuity function detects intermittent shorts and opens lasting as short a
91. ng measured By default this feature is turned off Be sure to set the alert voltage according to your test requirements To change the alert voltage level refer to Enabling and disabling the overvoltage alert on page 140 Hazardous voltage indication The multimeter will also display the hazardous voltage 4 symbol as an early precaution when the measured voltage is equal to or greater than 30 V in all voltage measurement modes Input warning To avoid circuit damage and possibly blowing the multimeter s current fuse do not place the probes across in parallel with a powered circuit when a lead is plugged into a current terminal This causes a short circuit because the resistance through the multimeter s current terminals is very low The multimeter emits a continuous beep and displays A Err or FA Err when the test lead is inserted into the pA mA or A input terminal but the rotary switch is not set to the correct current position U1271A U1272A User s Guide U1271A U1272A User s Guide Introduction 1 Preparing Your Multimeter Figure 1 3 Input warning display This warning is intended to stop you from attempting to measure voltage continuity resistance capacitance diode or temperature values when the leads are plugged into a current terminal 29 1 Introduction Preparing Your Multimeter Adjusting the tilt stand To adjust the multimeter to a 60 standing position pull the tilt stand outward to
92. nsure that fllkg is selected as the data logging option in the multimeter s Setup Set the recording interval duration 1 Press for more than 1 second to enter the multimeter s Setup mode 2 Press until L E nE is shown on the secondary display Press or to change the duration or a recording interval from 1 to 99999 seconds default 1 second 3 Press to save the changes Press and hold until the multimeter restarts The duration set in the steps above will determine how long each recording interval takes The input signal value at the end of each interval will be recorded and saved into the multimeter s memory Start the interval log mode 1 Press for more than 1 second to start interval log mode and the log entry number are displayed at the top of the display Subsequent readings are automatically recorded into the multimeter s memory at the interval specified in the Setup mode U1271A U1272A User s Guide Multimeter Features 3 Recording Measurement Data Data Logging Figure 3 7 Interval log display 2 Press for more than 1 second to exit the interval log mode The maximum number of readings that can be stored for the interval log is 10000 entries for the U1272A and 200 entries for the U1271A When all entries are occupied A FLULL will be shown when is pressed The interval and event log share the same memory buffer total combined 10000 entries for U1272A and 200 entries for U1271A Increased usage o
93. only 137 Changing the auto power off and backlight timeouts 138 Enabling and disabling the overvoltage alert 140 Changing the scale range 141 Changing the thermocouple type U1272A only 142 Changing the minimum measurable frequency 143 Changing the baud rate 144 Changing the data bits 145 Changing the parity check 146 Enabling and disabling the backlight alert 147 Enabling smooth mode 148 Changing the user scale conversion value and unit 149 Resetting the multimeter s setup options 150 Changing the temperature unit 151 The following sections describe how to change the preset features of your multimeter KEYSIGHT TECHNOLOGIES 4 Multimeter Setup Options Using the Setup Menu Using the Setup Menu 126 The multimeter s setup menu allows you to change a number of nonvolatile preset features Modifying these settings affects the general operation of your multimeter across several functions Select a setting to edit to perform one of the following e Switch between two values such as on or off e Cycle through multiple values from a predefined list e Decrease or increase a numerical value within a fixed range To contents of the setup menu are summarized in Table 4 2 on page 128 Table 4 1 Setup menu key functions Legend Description Press for more than 1 second to access the p3 setup menu Setup Press and hold until the multimeter restarts to exit the setup menu Peak Auto items gt
94. ons AC DC specifications for U1272A Table 5 6 U1272A true rms AC DC voltage specifications Accuracy 20 Hz to Function Range Resolution 45 Hz to 45 Hz 1kHz to 5 kHz to 20 kHz to 65 Hz 65 Hz to 5 kHz 20 kHz 100 kHz 1 kHz 30 mV 0 001 mV 0 7 40 0 8 45 1 1 45 1 1 60 3 6 60 300 mV 0 01 mV 0 7 25 0 8 30 1 1 30 1 1 45 3 6 45 3V 0 0001 V 0 7 25 1 1 30 1 6 30 2 1 45 3 6 45 oe 30 V 0 001 V 0 7 25 1 1 30 1 6 30 2 1 45 3 6 45 300 V 0 01 V 0 7 25 1 1 30 1 6 30 2 1 45 1000 V 0 1 V 0 7 25 1 1 30 1 6 30 Notes for U1272A AC DC voltage specifications 1 Overload protection 1000 Vrms For millivolt measurements 1000 Vrms for short circuits with lt 0 3 A current 2 Input impedance 10 MQ nominal in parallel with lt 100 pF 3 For 20 kHz to 100 kHz accuracy Three counts of the LSD per kHz of additional error is to be added for frequencies gt 20 kHz and signal inputs lt 10 of range U1271A U1272A User s Guide 165 5 Characteristics and Specifications Electrical Specifications Table 5 7 U1272A true rms AC DC current specifications Accuracy Function Range Resolution 20 Hz to 45 Hz Burden voltage 45 Hz to 65 Hz 65 Hz to 2 kHz 300 pall 0 01 uA 0 8 30 1 1 30 lt 0 04 V 3000 pA 0 1 uA 0 8 30 1 1 30 lt 0 4 V 30 malt 0 001 mA 0 8 30 1 1 30 lt 0 08 V Current 300 mA IBI 0 01 mA 0 8 30 1 1 30 lt 1 00 V 3 Al2 0 000
95. ons for different measuring functions Rotary switch position Input terminals Overload protection U1271A U1272A oy Zoow Qik V Fa TAN TAN 1000 Vrms V v LPF X LPF COM 2 Vv Vv mv mv M a 1000 Vrms for short circuit lt 0 3 A Q qQ Smart 2 gt Dt Auto 4 4 A COM 11 A 1000 V fast acting fuse mA A mA A 2 ae HA mA mA A mA A 440 mA 1000 V fast acting fuse HA HA 52 U1271A U1272A User s Guide Introduction 1 Cleaning Your Multimeter Cleaning Your Multimeter To avoid electrical shock or damage to the multimeter ensure that the insides of the casing stay dry at all times U1271A U1272A User s Guide Dirt or moisture in the terminals can distort readings Follow the steps below to clean your multimeter 1 Turn the multimeter off and remove the test leads 2 Turn the multimeter over and shake out any dirt that may have accumulated in the terminals Wipe the case with a damp cloth and mild detergent do not use abrasives or solvents Wipe the contacts in each terminal with a clean swab dipped in alcohol 53 1 54 Introduction Cleaning Your Multimeter THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK U1271A U1272A User s Guide KEYSIGHT TECHNOLOGIES U1271A U1272A Handheld Digital Multimeter User s Guide 2 Making Measurements Crest Factor 56 Measuring AC Voltage 57 Using the LPF Low Pass Filter Function for AC measurements 59 Measuring DC Voltage 60
96. or measuring temperatures from 40 C to 204 C 899 F in PTFE compatible environments Above this temperature range the probe may emit toxic gas Do not immerse this thermocouple probe in any liquid For best results use a thermocouple probe designed for each specific application an immersion probe for liquid or gel and an air probe for air measurement Observe the following measurement techniques e Clean the surface to be measured and ensure that the probe is securely touching the surface Remember to disable the applied power e When measuring above ambient temperatures move the thermocouple along the surface until you get the highest temperature reading e When measuring below ambient temperatures move the thermocouple along the surface until you get the lowest temperature reading e Place the multimeter in the operating environment for at least 1 hour as the multimeter is using a non compensation transfer adapter with miniature thermal probe e For quick measurement use the compensation to view the temperature variation of the thermocouple sensor The compensation assists you in measuring relative temperature immediately U1271A U1272A User s Guide 91 2 92 Making Measurements Measuring Temperature Temperature measurement without ambient compensation If you are working in a constantly varying environment where ambient temperatures are not constant do the following 1 Press to select compensa
97. play dBm is AC DC voltage measurement AC DC V enabled when is pressed DC coupling frequency measurement Hz DC voltage measurement DC mV AC voltage measurement AC mV DC voltage decibel display Coie enabled DC voltage measurement DC mV when 2 is pressed AC coupling frequency measurement Hz AC voltage measurement AC mV DC voltage measurement DC mV mV AC voltage decibel display dBm is enabled AC voltage measurement AC mV when is pressed AC coupling frequency measurement Hz AC DC voltage measurement AC DC mV AC voltage measurement AC mV DC voltage measurement DC mV AC DC voltage decibel display dBm is AC DC voltage measurement AC DC V enabled when amp is pressed U1271A U1272A User s Guide 183 B Dual Display Combinations Using the Dual Key Table B 2 U1272A dual display combinations continued Rotary switch position Function shown when E is pressed in the U1272A Primary display Secondary display Resistance measurement Q Ambient temperature ec F Continuity test Q Press amp to switch between the short or QSmart 2 open state Resistance measurement Q with offset Press to switch between the leakage and compensation Smart Q bias display Diode test V gt t Auto Ambient temperature c l2 Auto diode test V Capacitance measurement F Ambient temperature ec 3 Temperature measurement C or F Ambient temperature c DC coupling frequency measurement Hz
98. power before connecting the multimeter in the circuit Remember to place the multimeter in series with the circuit When servicing the multimeter use only the specified replacement parts Use caution when working above 60 V DC 30 V AC RMS or 42 4 V peak Such voltages pose a shock hazard Be aware of the presence of hazardous AC voltage before using the Low Pass Filter LPF function for AC voltage measurement Voltages measured are usually greater than what indicated on the multimeter as the AC voltages with higher frequencies have been filtered through the LPF function Do not use the Z pw low input impedance function U1272A only to measure voltages in circuits that could be damaged by this function s low input impedance of 2 kO When using the probes keep your fingers behind the finger guards on the probes Connect the common test lead before you connect the live test lead When you disconnect the leads disconnect the live test lead first Remove the test leads from the multimeter before you open the battery cover Do not operate the multimeter with the battery cover or portions of the cover removed or loosened To avoid false readings which may lead to possible electric shock or personal injury replace the battery as soon as the low battery indicator appears and flashes U1271A U1272A User s Guide Environmental Conditions This instrument is designed for indoor use and in an area with low condensation Th
99. r 300 mA 9999 9 1 Applies to both autoranging and manual range selection Changing the scale range You can change the scale range 4 20 mA or 0 20 mA by accessing the multimeter s Setup 1 Press for more than 1 second to enter the multimeter s Setup mode 2 Press until PErfEn is shown on the secondary display Press or to change the current scale range Available options 4 20 mA 0 20 mA or off 3 Press to save the changes Press and hold until the multimeter restarts Use the scale with a pressure transmitter a valve positioner or other output actuators to measure pressure temperature flow pH or other process variables 99 2 100 Making Measurements Measuring AC or DC Current gilent U1272A True RMS Multimeter 10A MAX CAT IV 600V FUSED CAT Ili 1000V 44omA im FUSED 7 A HA mA Pressure transmitter Figure 2 35 Measuring DC current using the 4 20 mA scale U1271A U1272A User s Guide Frequency Test Mode Making Measurements 2 Frequency Test Mode Never measure the frequency where the voltage or current level exceeds the specified range Manually set the voltage or current range if you want to measure frequencies below 20 Hz U1271A U1272A User s Guide Measuring the frequency of a signal helps 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
100. r s Guide 167 5 Characteristics and Specifications Electrical Specifications Temperature specifications Table 5 9 Temperature specifications Accuracy Thermal type Range Resolution U1271A U1272A 200 C to 1372 C 0 1 C 1 1 C 1 1 C K 328 F to 2502 F 0 1 F 1 1 8 F 1 1 8 F 200 C to 1200 C 0 1 C 1 1 C J 328 F to 2192 F 0 1 F 1 1 8 F Notes for temperature specifications 1 The specifications above is specified after 60 minutes of warm up time The accuracy does not include the tolerance of the thermocouple probe 3 Do not allow the temperature sensor to contact a surface that is energized above 30 Vrms or 60 V DC Such voltages poses a shock hazard 4 Ensure that the ambient temperature is stable within 1 C and that the Null function is used to reduce the test lead s thermal effect and temperature offset Before using Null function set the multimeter to measure temperature without ambient compensation f and keep the thermocouple probe as close to the multimeter as possible avoid contact with any surface that has a different temperature from the ambient temperature 5 When measuring temperature with respect to any temperature calibrator try to set both the calibrator and multimeter with an external reference without internal ambient compensation If both the calibrator and multimeter are set with internal reference with internal ambient compensation some devia
101. r the multimeter s Setup mode 2 AHOld should be shown on the secondary display If not press or until it is shown 3 Press or to edit the value shown on the primary display 4 Press to save the changes Press and hold until the multimeter restarts If the reading value is unable to reach a stable state when exceeding the preset variation the reading value will not be updated 115 3 Multimeter Features Recording Measurement Data Data Logging Recording Measurement Data Data Logging The Data Logging function provides you the convenience of recording test data for future review or analysis Since data is stored in the nonvolatile memory the data remains saved even when the multimeter is turned OFF or if the battery is replaced The Data Logging feature collects measurement information over a user specified duration There are three data logging options that can be used to capture measurement data manual HAnd interval Aliko or event Er G e A manual log stores an instance of the measured signal Hz m each time cs is pressed See page 117 e An interval log stores a record of the measured signal at a user specified interval See page 118 e An event log stores a record of the measured signal each time a trigger condition is satisfied See page 120 Table 3 2 Data logging maximum capacity Maximum capacity for saving Data logging option U1271A U1272A Manual HAnd 100 100 Interval
102. rded minimum value or above the recorded maximum value the multimeter beeps and records the new value The elapsed time since the recording session was started is stored and shown on the display at the same time The multimeter also calculates an average of all readings taken since the MaxMin mode was activated From the multimeter s display you can view the following statistical data for any set of readings e Max highest reading since the MaxMin function was enabled e Min lowest reading since the MaxMin function was enabled e Avg average or mean of all readings since the MaxMin function was enabled e MaxMinAvg present reading actual input signal value This function is applicable to all measurements except for continuity and diode tests 1 Press to enable the MaxMin operation MaxMin 2 Press Us lt again to cycle through the Max Min Avg or present MaxMinAvg input values 112 U1271A U1272A User s Guide NOTE U1271A U1272A User s Guide Multimeter Features 3 Capturing Maximum and Minimum Values MaxMin Figure 3 4 MaxMin display 3 The elapsed time is shown on the secondary display Press to restart the recording session Changing the range manually will also restart the recording session If an overload is recorded the averanging function will be stopped GL is shown in place of the average value The APO auto power off function is disabled when MaxMin is enabled The maxi
103. re than 1 second to switch back the displays 176 U1271A U1272A User s Guide Table A 2 U1272A default and shift functions Shift Functions Using the Shift Key A Rotary switch position U1272A Function shown in the primary display Default When s is pressed ZLow Ne SS v fal v Ta Ny lt il smart Q gt Auto 3 v mA A With the positive probe inserted into the pA mA terminal mAcA With the positive probe inserted into the A terminal Low impedance Z gy AC or DC voltage measurement AC DC yy AC voltage measurement AC V AC voltage measurement AC mV DC voltage measurement DC V DC voltage measurement DC mV Resistance measurement Q Diode test V Capacitance measurement F DC current measurement DC mA DC current measurement DC A AC voltage measurement AC V with low pass filter LPF AC voltage measurement AC mV with low pass filter LPF AC voltage measurement AC V AC DC voltage measurement AC DC V AC voltage measurement AC mV AC DC voltage measurement AC DC mV Continuity test Q Resistance measurement Q with offset compensation Smart Q Auto diode test V Temperature measurement C or F AC current measurement AC mA AC DC current measurement AC DC mA 0 20 or 4 20 mA AC current measurement AC A AC DC current measurement AC DC A 0 20 or 4 20 A U1271A U1272A User s Gui
104. rement range i If you are using the A terminal set the rotary switch to coe ii If you are using the pA mA terminal set the rotary switch to ja for currents below 5000 uA 5 mA or EA for currents above 5000 uA To avoid blowing the multimeter s 440 mA fuse use the pA mA terminal only if you are sure the current is less than 400 mA See Figure 2 33 for test lead connections and function selection Refer to the Input warning section for information on the alerts the multimeter uses when leads are not used correctly for current measurements 93 2 Making Measurements Measuring AC or DC Current 2 Press Gs to cycle between DC AC AC DC or scale mm or mm current measurements 3 Open the circuit path to be tested Probe the test points and read the display Figure 2 30 DC current display Reversing the leads will produce a negative reading but will not damage NOTE f the multimeter CAUTION For measuring AC current signals with a DC offset U1272A only refer to the Measuring AC and DC Signals U1272A only on page 64 For measuring DC current from a mixed signal in DC measurement mode ensure that the Filter is enabled Refer to Enabling and disabling the Filter on page 131 NOTE Press amp to cycle through the available dual display combinations See Appendix B Dual Display Combinations Using the Dual Key starting on page 179 to learn more Press to enab
105. rforming interval logs AUto 118 Performing event logs triG 120 Reviewing Previously Recorded Data View 122 The following sections describe the additional features available in your multimeter 3 Multimeter Features Making Relative Measurements Null Making Relative Measurements Null 108 NOTE When making null measurements also called relative each reading is the difference between a stored selected or measured null value and the input signal One possible application is to increase the accuracy of a resistance measurement by nulling the test lead resistance Nulling the leads is also particularly important prior to making capacitance measurements Null can be set for both auto and manual range settings but not in the case of an overload 1 To activate the relative mode press the key The measurement value at the time that when Null A is enabled is stored as the reference value Figure 3 1 Null display 2 Press again to view the stored reference value The display will return to normal after 3 seconds 3 To disable the Null function press while the stored reference value is shown step 2 For any measurement function you can directly measure and store the null value by pressing with the test leads open nulls the test lead capacitance shorted nulls the test lead resistance or across a desired null value circuit U1271A U1272A User s Guide Multimeter Features 3 Making Relative Measure
106. rrents gt 10 A cool down the multimeter for twice the duration of the measured time before proceeding with low current measurements 162 U1271A U1272A User s Guide Characteristics and Specifications 5 Electrical Specifications AC specifications for U1272A Table 5 4 U1272A true rms AC voltage specifications Accuracy 20 Hz to Function Range Resolution 45 Hz to 45 Hz 1 kHz to 5 kHz to 20 kHz to 65 Hz 65 Hz to 5 kHz 20 kHz 100 kHz 1 kHz 30 mV 0 001 mV 0 6 20 0 7 25 1 0 25 1 0 40 3 5 40 300 mV 0 01 mV 0 6 20 0 7 25 1 0 25 1 0 40 3 5 40 3V 0 0001 V 0 6 20 1 0 25 1 5 25 2 0 40 3 5 40 30 V 0 001 V 0 6 20 1 0 25 1 5 25 2 0 40 3 5 40 300 V 0 01 V 0 6 20 1 0 25 1 5 25 2 0 40 1000 V 01V 0 6 20 1 0 25 1 5 25 Voltage LPF low pass filter 1 0 25 i lt 200H enabled applicable for all 0 6 20 Z voltage ranges and 5 0 25 resolution lt 440 Hz Ziow low input impedance enabled applicable for 2 40 1000 V range and resolution PREA lt 440 Hz only 4 Notes for U1272A AC voltage specifications Overload protection 1000 Vrms For millivolt measurements 1000 Vrms for short circuits with lt 0 3 A current Input impedance 10 MQ nominal in parallel with lt 100 pF The input signal is lower than the product of 20 000 000 VxHz Ziow impedance 2 kQ nominal For Z yyy measurements autoranging is disabled and the multimeter
107. rs have a safety rating of CAT II 1000 V and CAT IV 600 V Measurement category definition Measurement CAT are for measurements performed on circuits not directly connected to the AC mains Examples are measurements on circuits not derived from the AC mains and specially protected internal mains derived circuits Measurement CAT II are measurements performed on circuits directly connected to a low voltage installation Examples are measurements on household appliances portable tools and similar equipment U1271A U1272A User s Guide U1271A U1272A User s Guide Characteristics and Specifications 5 Measurement Category Measurement CAT III are measurements performed in the building installation Examples are measurements on distribution boards circuit breakers wiring including cables bus bars junction boxes switches socket outlets in the fixed installation and equipment for industrial use and some other equipment including stationary motors with permanent connection to the fixed installation Measurement CATIV are measurements performed at the source of the low voltage installation Examples are electricity meters and measurements on primary over current protection devices and ripple control units 157 5 Characteristics and Specifications Electrical Specifications Electrical Specifications Specification assumptions are given on page 156 DC specifications Table 5 1 DC specifications Accuracy
108. s 1 ms A brief short or open causes the multimeter to emit a short beep and flash 75 2 Making Measurements Testing for Continuity You can enable or disable the audible and visual alert via the multimeter s Setup See Changing the beep frequency on page 130 and Enabling and disabling the backlight alert on page 147 for more information on the audible and visual alert options U1272A True RMS Multimeter O O ON closed 10A MAX CATIV 600V CAT III 1000V FUSED 44omA m FUSED F PE A HA mA COM Figure 2 16 Testing for continuity 76 U1271A U1272A User s Guide Making Measurements 2 Using Smart Q for Resistance Measurements U1272A only Using Smart Q for Resistance Measurements U1272A only Smart offset compensation removes unexpected DC voltages within instrument at the input or at the circuit being measured which will add to resistance measurement errors The bias voltage or leakage current is shown on the secondary display Using the offset compensation method the multimeter takes the difference between two resistance measurements when two different test currents are applied to determine if there are any offset voltages in the input circuitry The resultant displayed measurement corrects this offset giving a more accurate resistance measurement The Smart Q is applicable for the 30 Q 300 Q 3 kQ 30 kQ and 300 kQ resistance range only The maximum correctable offset bias voltage is 5
109. s 15 seconds page 138 Set the multimeter s voltage alert value from 0 1 V to page 28 and Annnt mann ALEre OGUE to id IGG V or oF F 1010 V or off Default is off page 140 Set the multimeter s scale selection 0 20 mA 4 20 mA page 98 and r n n 30 PErCEn 0 e0 mA 4 20 mA or oF F or off Default is 4 20 mA page 141 roum K U1272A only Set the multimeter s thermocouple type page 88 and COUPLE EPET or EXPE type J or type K Default is type K page 142 128 U1271A U1272A User s Guide Multimeter Setup Options 4 Setup Menu Summary Table 4 2 Setup menu item descriptions continued Legend Available settings Description Learn more on Pred bAud dAtAb Pri t4 A bL Snoot H uSEr rESEE E m E 55 Hz or 9 Hz 9600 or 9200 Tb or B b non En or add oFF or on td to 9999d or O00 id t OG E to 9999E 000D to 0000 V V A V or 000 no unit V dEFRU Of Of OF OF or OF Of Set the minimum measurement frequency 0 5 Hz or 10 Hz Default is 0 5 Hz Set the baud rate for remote communication with a PC 9600 or 19200 Default is 9600 Set the data bit length for remote communication with a PC 7 bit or 8 bit Default is 8 bit Set the parity bit for remote communication with a PC none even or odd Default is none Set the multimeter to flash the backlight during alerts Default is on Set the primary display s settling value from 0001 d to 9999 d or
110. ser scale conversion value and unit on page 149 for more information Press and hold _s for more than 1 second to enable the Scale operation The most recently saved default 1 kV V x1000 0 ratio and unit will be shown on the primary and secondary displays Press while the RAES symbol is flashing to cycle through the available ratio and unit displays Press while the Z9 symbol is flashing to save the selected ratio and unit and start the conversion The selected ratio and unit will be used as the default ratio and unit the next time Scale is enabled Or while the RAIS symbol is flashing if no activity is detected after 3 seconds the conversion will begin with the specified ratio and unit shown on the primary display Press and hold ss for more than 1 second to cancel the Scale operation U1271A U1272A User s Guide Multimeter Features 3 Making Scale Transfers Scale NOTE The is disabled during Scale operations Press to enable the frequency test mode for voltage and current measurements during Scale operations Press C Press Press or after 3 seconds of inactivity Figure 3 3 Scale operation U1271A U1272A User s Guide 111 3 Multimeter Features Capturing Maximum and Minimum Values MaxMin Capturing Maximum and Minimum Values MaxMin The MaxMin operation stores the maximum minimum and average input values during a series of measurements When the input goes below the reco
111. signal goes below the recorded minimum value or above the recorded maximum value the multimeter beeps and records the new value At the same time the elapsed time since the peak recording session was started is stored as the recorded value s time stamp The APO auto power off function is disabled when Peak is enabled U1271A U1272A User s Guide Multimeter Features 3 Freezing the Display TrigHold and AutoHold Freezing the Display TrigHold and AutoHold U1271A U1272A User s Guide TrigHold operation To freeze the display for any function press the E key If GBS is pressed while a MaxMin Peak or Data Logging recording session is in progress the display freezes but the data acquisition continues in the background Pressing Gg ron again updates the display to reflect data that was acquired during the hold AutoHold operation Pressing the G roa for more that 1 second activates the AutoHold if the multimeter is not in the MaxMin Peak or Data Logging recording modes AutoHold operation monitors the input signal and updates the display and if enabled emits a beep whenever a new stable measurement is detected A stable measurement is one that does not vary more than a selected adjustable AutoHold threshold variation count for at least one second default 500 counts Open lead conditions are not included in the update Changing the default AutoHold threshold count 1 Press for more than 1 second to ente
112. suring AC Voltage AC voltage measurements measured with this multimeter are returned as true rms root mean square readings These readings are accurate for sine waves and other wave forms with no DC offset such as square waves triangle waves and staircase waves For measuring AC voltage signals with DC offset U1272A only refer to the Measuring AC and DC Signals U1272A only section later in this manual 1 Rotate the multimeter s rotary switch to y Mxy or U1272A only 2 Set up your multimeter to measure AC voltage as shown in Figure 2 2 3 Probe the test points and read the display Figure 2 1 AC voltage display NOTE Press amp to cycle through the available dual display combinations See U1271A U1272A User s Guide Appendix B Dual Display Combinations Using the Dual Key starting on page 179 to learn more e Press to enable the frequency test mode for voltage measurements See Frequency Test Mode on page 101 to learn more 57 58 Making Measurements Measuring AC Voltage Agilent U1272A True RMS Multimeter 10A MAX CAT IV 600V CAT Ill 1000V FUSED 440mA MAX FUSED 2s A HA mA com rN Figure 2 2 Measuring AC voltage U1271A U1272A User s Guide Making Measurements 2 Measuring AC Voltage Using the LPF Low Pass Filter Function for AC measurements Your multimeter is equipped with an AC low pass filter to help reduce unwanted electronic noise wh
113. t if not correctly performed or adhered to could result in personal injury or death Do not proceed beyond a WARN ING notice until the indicated conditions are fully understood and met 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 Direct current DC Caution risk of electric shock Alternating current AC A A Caution risk of danger refer to this manual for specific Warning or Caution information Both direct and alternating current St Category III 1000 V overvoltage protection Earth ground terminal car H Category IV 600 V overvoltage protection E lk el 2 Equipment protected throughout by double insulation or reinforced insulation Caution risk of hazardous voltage icon appears on the instrument screen U1271A U1272A User s Guide Safety Considerations CAUTION Read the information below before using this multimeter The descriptions and instructions in this manual apply to the Keysight U1271A and U1272A Handheld Digital Multimeters hereafter referred to as the multimeter The model U1272A appears in all illustrations Disconnect circuit power and discharge all high voltage capacitors before testing resistance continuity diodes or capacitance e Use the proper terminals function and range for your measurements e This device is for use a
114. t altitudes of up to 2 000 m e Never measure voltage when current measurement is selected Always use the specified battery type The power for the meter is supplied with four standard AAA 1 5 V batteries Observe the correct polarity markings before you insert the batteries to ensure proper insertion of the batteries in the meter You are advised to use low leakage batteries when changing to new batteries Please remember to remove the batteries when the meter is not in use for a long period of time Warning on the risk of battery leakage Do not use the multimeter if it is damaged Before you use the multimeter inspect the case Look for cracks or missing plastic Pay particular attention to the insulation surrounding the connectors e Inspect the test leads for damaged insulation or exposed metal Check the test leads for continuity Replace damaged test leads before you use the multimeter Do not operate the multimeter around explosive gas vapor or wet environments Do not apply more than the rated voltage as marked on the multimeter between terminals or between terminal and earth ground U1271A U1272A User s Guide Never use the multimeter in wet conditions or when there is water on the surface If the multimeter is wet ensure that the multimeter is dried only by trained personnel Before use verify the multimeter s operation by measuring a known voltage When measuring current turn off the circuit
115. t functions 177 The tables below list the function shown in the primary display when the CEJ key is pressed with respect to the multimeter s rotary switch position Press CEJ to cycle through the available shift functions A Shift Functions Using the Shift Key Table A 1 U1271A default and shift functions Rotary switch position Function shown in the primary display U1271A Default When is pressed AC voltage measurement DC voltage we IT Qik V measurement shown on secondary display Ac Dc v mia AC voltage measurement AC V AC voltage measurement AC V with low pass filter LPF AC voltage measurement AC mV with low A aly AC voltage measurement AC mV pass filter LPF T DC voltage measurement DC V mv DC voltage measurement DC mV o Resistance measurement Q Continuity test Q gt Diode test V 4 Capacitance measurement F Temperature measurement C or F AC current measurement AC mA mA A With the positive probe inserted into the HA mA terminal ii mA A With the positive probe inserted into the A terminal wes HA DC current measurement DC mA DC current measurement DC A DC current measurement DC uA 0 20 or 4 20 DC mA AC current measurement AC A 0 20 or 4 20 DC A AC current measurement AC uA 1 Press e to switch the function shown in the primary display AC V with the function shown in the secondary display DC V Press for mo
116. t page Bp and page 88 No AC DC or AC DC current measurement mAcA page 93 and x AC DC or AC DC current measurement up page 64 HA to microamperes 40 U1271A U1272A User s Guide Keypad U1271A U1272A User s Guide Introduction Your Multimeter in Brief The operation of each key is explained below Pressing a key enables a function displays a related symbol and emits a beep Turning the rotary switch to another position resets the current operation of the key Click the respective Learn more pages for more information on each function True RMS Multimeter ANull Hz ms Scale E7 Range gt Kuto Shift Esc View Figure 1 12 Keys 41 1 1 Introduction Your Multimeter in Brief Table 1 7 Keypad functions Function when pressed for displays if available frequency test and dual display modes Learn Legend Less than 1 second More than 1 second more on Sets the Scale mode for the specified ratio and unit display Only applicable for voltage measurements l The most recently saved or default Sets the Null Relative mode ratio and unit will be shown on the e The displayed value is saved as a primary and secondary displays reference to be subtracted from Press 42_ while the E23 symbol is subsequent measurements flashing to cycle through the available While in Null mode press C again ratio and unit displays page 108 to view the stored reference value t
117. tary switch position are described in Table 1 5 U1271A and Table 1 6 U1272A Turning the rotary switch changes the measurement function and resets all other measurement options The U1272A model offers four additional rotary switch functions Ziow ow input impedance voltage measurements e Smart offset compensation measurements e Auto diode test and e AC DC voltage and current measurements The U1271A has one differing rotary switch function e Qik V test Click the respective Learn more pages for more information on each function Some rotary switch positions have a shifted function printed in orange Press G9 to switch between the shifted and regular function See page 44 for more information on the G49 key WARNING Remove the test leads from the measuring source or target before changing the rotary switch position U1271A U1272A User s Guide 37 1 38 Introduction Your Multimeter in Brief Figure 1 10 U1271A rotary switch Each position of the U1271A rotary switch shown in Figure 1 10 is described in Table 1 5 Table 1 5 U1271A rotary switch functions Legend Description Learn more on Off page 25 VE AC or DC voltage measurement for signal age 70 Qik V identification pag LPF Y AC voltage measurement with Low Pass Filter page 56 and mam AC voltage measurement up to millivolts page 59 mV with Low Pass Filter T DC voltage measurement page 60 mv DC voltage measurement
118. the possibility of false readings in areas where the presence of ghost voltages are suspected The Z ow function in your multimeter presents a low impedance across the leads to obtain a more accurate measurement 1 To make a Z ow measurement rotate the multimeter s rotary switch to Reon 2 Probe the test points and read the display The AC voltage measurement is shown in the primary display and the DC voltage measurement is shown in the secondary display Press to exchange the AC and DC voltage indication on the primary and secondary displays U1271A U1272A User s Guide Making Measurements 2 Using Z ow for Voltage Measurements U1272A only Figure 2 11 Z gw display During Z ow measurements autoranging is disabled and the multimeter s range is set to 1000 volts in the manual ranging mode Use Z pw to test a battery s health Aside from reading a battery s voltage level using the DC voltage measurement function you can also use the Ziow function to test a battery s health If you detect that the measured battery s voltage shown in the Z ow function is declining gradually this means that the capacity of battery under test is not enough to support regular functions Use this simple and quick test to determine if a battery has enough voltage capacity to support regular activities Prolonged used of the Z ow function will consume the capacity of the NOTE battery under test U1271A U1272A User s Guide 69
119. tion This allows a quick measurement of the relative temperature 2 Avoid contact between the thermocouple probe and the surface to be measured 3 After a constant reading is obtained press to set the reading as the relative reference temperature 4 Touch the surface to be measured with the thermocouple probe and read the display Figure 2 29 Temperature measurement without ambient compensation U1271A U1272A User s Guide Making Measurements 2 Measuring AC or DC Current Measuring AC or DC Current Never attempt an in circuit current measurement where the open circuit potential to earth is greater than 1000 V Doing so will cause damage to the multimeter and possible electric shock or personal injury CAUTION To avoid possible damage to the multimeter or to the equipment under test e Check the multimeter s fuses before measuring current e Use the proper terminals function and range for your measurement e Never place the probes across in parallel with any circuit or component when the leads are plugged into the current terminals U1271A U1272A User s Guide To measure current you must open the circuit under test then place the multimeter in series with the circuit To measure AC or DC current proceed as follows 1 Turn off power to the circuit Discharge all high voltage capacitors Insert the black test lead into the COM terminal Insert the red test lead in an input appropriate for the measu
120. tions may show between the readings of the calibrator and multimeter due to differences in ambient compensation between the calibrator and multimeter Keeping the multimeter close to the output terminal of calibrator will help reduce the deviation 6 The temperature calculation is specified according to the safety standards of EN IEC 60548 1 and NIST175 168 U1271A U1272A User s Guide Characteristics and Specifications 5 Electrical Specifications Frequency specifications Table 5 10 Frequency specifications Range Resolution Accuracy Minimum input frequency 99 999 Hz 0 001 Hz 0 02 5 999 99 Hz 0 01 Hz 0 005 5 9 9999 kHz 0 0001 kHz 0 005 5 0 5 Hz 99 999 kHz 0 001 kHz 0 005 5 999 99 kHz 0 01 kHz 0 005 5 gt 1 MHz 0 1 kHz 0 005 5 lt 1 MHz Notes for frequency specifications 1 Overload protection 1000 V input signal is lt 20 000 000 V x Hz product of voltage and frequency 2 The frequency measurement is susceptible to error when measuring low voltage low frequency signals Shielding inputs from external noise pickup is critical for minimizing measurement errors Turning on the low pass filter may help you to filter out the noise and achieve a stable reading Duty cycle and pulse width specifications Table 5 11 Duty cycle and pulse width specifications Function Mode Range Resolution Accuracy at full scale DC coupling 99 99 0 3 per kHz 0 3 Duty cycle AC coupling 99 99 0 3 per kHz
121. up Options 4 Setup Menu Items 5 Press and hold until the multimeter restarts to return Setup to normal operation Enabling and disabling the Filter There are two Filter MA options within the design of the multimeter e In AC AC DC measurement mode the Filter works as a low pass filter and attenuates signals with frequencies of more than 1 kHz e In DC measurement mode the Filter will block AC signals Only one of the two filters can be in the signal path at any point in time The possible scenarios are e Only the AC Low Pass Filter is enabled e Only the DC Filter is enabled e No Filter in the signal path The icon appears when either of the filter circuits are enabled When either LPF is enabled the measurement speed response time will be impacted The DC Filter cannot be used when the dual display mode is enabled where AC and DC voltages are measured U1271A U1272A User s Guide 131 4 Multimeter Setup Options Setup Menu Items CAUTION Table 4 3 Filter LPF options Filter setting Measurement pc DCAC OFF Ac Ac pc OFF Low Pass Filter OFF DC Filter blocks AC Filter blocks AC OFF Dual display OFF Low Pass Filter OFF 1 The Filter DC will be set to ON as the factory default You may change it to an alternate setting and the multimeter will remember the chosen setting for con secutive uses 2 The AC DC measurement mode is only valid for the U1272A only You may enable the Fi
122. urement display AC DC and AC DC indication for secondary display Elapsed time for Peak and Recording mode Measuring units for the secondary display Low pass filter enabled for AC measurement Filter enabled for DC measurement Hazardous voltage sign for measuring voltage gt 30 V or overload Trigger hold enabled Auto hold enabled Peak hold maximum value enabled Peak hold minimum value enabled Maximum reading shown on primary display Minimum reading shown on primary display Averaged reading shown on primary display Present reading shown on primary display Relative Null enabled Audible continuity test selected page 68 page 70 and page 101 page 114 and page 116 page 49 page 59 page 63 page 28 page 115 page 114 page 112 page 108 page 74 46 U1271A U1272A User s Guide U1271A U1272A User s Guide Introduction 1 Your Multimeter in Brief Table 1 8 General annunciators Legend Description Learn more on J type thermocouple selected page 90 KI K type thermocouple selected o Temperature measurement without ambient compensation selected page 92 4 20 mA scale mode selected page 98 0 20 0 20 mA scale mode selected DC direct current Boge oy and page 93 page 56 and o AC alternating current paga 93 x AC DC page 64 Capacitor is charging during capacitance measurement Fl Positive slope for pulse width ms and duty cycle measurements pag
123. urement setup 97 4 20 mA Scale display 98 Measuring DC current using the 4 20 mA scale 100 Functions allowing frequency measurement 101 Frequency pulse width and duty cycle measurements 102 Frequency display 103 Pulse width display 104 Duty cycle display 105 Nulldisplay 108 Null operation 109 Scale operation 111 MaxMin display 113 Peak display 114 Manual log display 117 Interval log display 119 Event log display 121 View display 122 Empty view display 122 bEEP display 130 FiLtEr display 133 AHOLd display 134 d LoG display 135 L tiME display 136 dCibEL display 137 U1271A U1272A User s Guide U1271A U1272A User s Guide Figure 4 7 Figure 4 8 Figure 4 9 Figure 4 10 Figure 4 11 Figure 4 12 Figure 4 13 Figure 4 14 Figure 4 15 Figure 4 16 Figure 4 17 Figure 4 18 Figure 4 19 Figure 4 20 Figure 4 21 dbrEF display 138 APo display 139 bLit display 139 ALErt display 140 PErCEn display 141 CoUPLE display 142 FrEq display 143 bAUd display 144 dAtAb display 145 PAritY display 146 A bLit display 147 SMootH display 148 SMootH display 149 rESEt display 150 t Unit display 151 18 THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK U1271A U1272A User s Guide List of Tables U1271A U1272A User s Guide Table 1 1 Table 1 2 Table 1 3 Table 1 4 Table 1 5 Table 1 6 Table 1 7 Table 1 8 Table 1 9 Table 1 10 Table 1 11 Table 2 1 Table 2 2 Table 2 3 Table 3 1 Table 3 2 Table 3 3 Table

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