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2

Scope Features and Functions

62

U2701A/U2702A Modular Oscilloscopes User’s Guide

FFT Settings

Selecting an FFT Window

There are four FFT windows. Each window has trade- offs 
between frequency resolution and amplitude accuracy. Use the 
following guidelines to select the best window.

The 

Random Dither

 option enables the reduction of noise floor. 

To enable this option, click on the Random Dither checkbox.

Horizontal

 scaling is automatically calculated. It will span the 

entire range of spectrum horizontally for best- fit display.

Vertical 

Scale

 option allows you to scale your spectrum 

vertically. Vertical 

Offset

 allows you to adjust the vertical offset 

of your spectrum. 

Table 2-8

Comparison between the four FFT windows

Window

Characteristics

Best for measuring

Rectangular

Best frequency resolution, worst 
magnitude resolution. This is 
essentially the same as no window.

Transients or bursts, the waveform levels before 
and after the event are nearly equal. 
Equal-amplitude sine waves with fixed 
frequencies. Broadband random noise with a 
relatively slow varying spectrum.

Hanning

Hamming

Better frequency, poorer magnitude 
accuracy than Rectangular. Hamming 
has slightly better frequency resolution 
than Hanning.

Sine, periodic, and narrow-band random noise. 
Transients or bursts where the waveform levels 
before and after the events are significantly

different.

Blackman Harris

Best magnitude, worst frequency 
resolution.

Single frequency waveforms, to find higher 
order harmonics.

Flattop

Best amplitude accuracy, poor 
frequency resolution when compared 
with the Hanning window.

Amplitude of single frequency components with 
little nearby spectral energy in the signal

U2700A_Modular_Scope.book  Page 62  Tuesday, May 6, 2008  9:32 AM

Содержание U2701A

Страница 1: ...Agilent Technologies Agilent U2701A U2702A USB Modular Oscilloscopes User s Guide U2700A_Modular_Scope book Page i Tuesday May 6 2008 9 32 AM...

Страница 2: ...re 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...

Страница 3: ...ution risk of electric shock Three phase alternating current Caution risk of danger refer to this manual for specific Warning or Caution information Earth ground terminal Caution hot surface Protectiv...

Страница 4: ...pment Inspect the test probe for damaged insulation or expose metal and check for continuity Do not use test probe if found damaged Do not operate the equipment in an explosive atmosphere or in the pr...

Страница 5: ...to 50 C Storage Temperature 20 C to 70 C Operating Humidity 20 to 85 RH non condensing Storage Humidity 5 to 90 RH non condensing CAUTION The Agilent U2701A U2702A are safety certified in compliance...

Страница 6: ...ia EMC Framework regulations under the terms of the Radio Communication Act of 1992 ICES NMB 001 indicates that this ISM device complies with Canadian ICES 001 Cet appareil ISM est confomre la norme N...

Страница 7: ...ronic 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 prod...

Страница 8: ...1 1990 EN55011 1990 Class A Group 1 IEC 61000 4 2 1995 EN 61000 4 2 1995 4 kV CD 8 kV AD IEC 61000 4 3 1995 EN 61000 4 3 1996 3 V m 80 1000 MHz IEC 61000 4 4 1995 EN 61000 4 4 1995 0 5 kV signal lines...

Страница 9: ...1 EN 61010 1 2001 Canada CAN CSA C22 2 No 61010 1 04 USA ANSI UL 61010 1 2004 Safety Additional Information The product herewith complies with the essential requirements of the Low Voltage Directive 2...

Страница 10: ...This chapter also includes information on checklist system requirements and installation of hardware 2 Scope Features and Functions define the U2701A U2702A USB modular oscilloscopes various operation...

Страница 11: ...r 12 E Connect the Modular Oscilloscope to Your PC 14 F Verify Your Modular Oscilloscope Connection 18 G Launch Your Agilent Measurement Manager 20 Modular Products Chassis 22 L Mount Kit Installation...

Страница 12: ...nction 67 Options Controls 70 Acquisition Mode 71 Display Options 72 AutoScale and Run Stop buttons 74 Pan and Zoom 75 3 Characteristics and Specifications Specifications 80 Characteristics 81 Product...

Страница 13: ...orm when Maximum measurement is selected 52 Figure 2 8 Automatic measurements on the Measurements Cursors panel 54 Figure 2 9 Measurements panel and Measurements Results panel 59 Figure 2 10 Soft fron...

Страница 14: ...Figures xiv U2701A U2702A Modular Oscilloscopes User s Guide U2700A_Modular_Scope book Page xiv Tuesday May 6 2008 9 32 AM...

Страница 15: ...nu 42 Table 2 3 Pulse Width Trigger menu 44 Table 2 4 TV Trigger Menu 45 Table 2 5 Line or count for Generic numbers per field for each non HDTV EDTV video standard 47 Table 2 6 List of Time Measureme...

Страница 16: ...Tables xvi U2701A U2702A Modular Oscilloscopes User s Guide U2700A_Modular_Scope book Page xvi Tuesday May 6 2008 9 32 AM...

Страница 17: ...ent Manager 12 E Connect the Modular Oscilloscope to Your PC 14 F Verify Your Modular Oscilloscope Connection 18 G Launch Your Agilent Measurement Manager 20 Modular Products Chassis 22 L Mount Kit In...

Страница 18: ...flawlessly The U2701A U2702A also feature a large memory up to 32 Mpts and high sampling rate up to 500 M S ch This two features allowing a longer capture time as well as enabling more signals to be...

Страница 19: ...is stable Ensure that the ambient relative humidity is less than 80 Allow a 30 minutes warm up period before calibration Keep all the test connection cables as short as possible NOTE Under standalone...

Страница 20: ...oduct Overview Product Outlook Top View Front View Rear View Front Bumper Rear Bumper USB Indicator Power Indicator Channel 1 Input Channel 2 Input External Trigger BNC Ground Power Inlet USB Inlet 55...

Страница 21: ...loscopes User s Guide 5 Product Dimension Without Front and Rear Bumper With Front and Rear Bumper Top View Top View 180 34 mm 175 00 mm 180 00 mm Front View Front View Rear View Rear View U2700A_Modu...

Страница 22: ...Standard A to Mini B Interface Cable 10 1 Passive Probe 150 MHz 1 2m only applicable for U2701A N2862A 10 1 Passive Probe 300 MHz 1 2m only applicable for U2702A N2863A L Mount Kit used with modular i...

Страница 23: ...e the modular oscilloscope with Agilent VEE Labview or Microsoft Visual Studio only you can skip steps E and H in the following flowchart You need to install the IVI COM driver if you are going to use...

Страница 24: ...following Microsoft Windows versions Windows XP Professional or Home Edition Service Pack 1 or later Windows 2000 Professional Service Pack 4 or later Browser Microsoft Internet Explorer 5 01 or high...

Страница 25: ...d type drive autorun auto exe where drive is your CD ROM drive location 3 If you obtain the IO Libraries Suite from the web save the self extracting zip file exe to any location on your hard disk 4 Do...

Страница 26: ...U2702A USB Modular Oscilloscopes User s Guide 1 Getting Started NOTE For more information on the IO Libraries Suite go to www agilent com find iolib U2700A_Modular_Scope book Page 10 Tuesday May 6 200...

Страница 27: ...gin the installation 3 If the menu does not launch automatically go to Start Run and type drive Driver Hardware setup_hw exe where drive is your CD ROM drive location 4 Click OK to begin the installat...

Страница 28: ...tion menu does not appear after a few seconds go to Start Run and type drive Application Modular Instruments Measurement Manager setup exe where drive is your CD ROM drive location 4 Click OK to begin...

Страница 29: ...inish when the installation has completed A shortcut to this software will be created on your desktop NOTE USING THE LICENSED MATERIALS INDICATES YOUR ACCEPTANCE OF THE LICENSE TERMS IF YOU DO NOT AGR...

Страница 30: ...he AC DC power adapter to the power jack on the rear panel of the modular oscilloscope 3 Connect the modular oscilloscope to any USB port on your PC with the bundled USB cable 4 Your PC will automatic...

Страница 31: ...odular oscilloscope NOTE If you do not wish to receive similar warning messages in the future follow the instructions below 1 Go to Start Control Panel and double click System 2 Select the Hardware ta...

Страница 32: ...nstallation 8 The Assign USB device alias window will appear Each time the modular oscilloscope is plugged in this dialog box will appear To disable this dialog select the Never show this dialog optio...

Страница 33: ...C the following message box will appear The model number and firmware versions shown on the message box may vary depending on the module connected to your PC c Click Yes to begin the firmware download...

Страница 34: ...t is able to automatically detect any modular oscilloscope plugged into the PC 1 Go to Start All Programs Agilent IO Libraries Suite Agilent Connection Expert to launch the Connection Expert 2 The det...

Страница 35: ...ick Send Read to send the IDN default command The instrument response should appear in the Instrument Session History panel 5 If the Connection Expert can successfully communicate with the modular osc...

Страница 36: ...anager to launch the software 2 The Measurement Manager welcome screen will appear NOTE The IO Control will launch automatically when you start your PC Launching the Measurement Manager without runnin...

Страница 37: ...s Guide 21 3 The Select USB Device dialog box will appear displaying the connected modular oscilloscope To start the application select the modular oscilloscope and click OK to establish the connectio...

Страница 38: ...tionality GND Ground NC Not connected VBUS USB bus power sensing input USB_D USB_D USB differential pair TRIG0 TRIG7 Trigger bus 12 V 12 V power with 4 A current nBPUB USB backplane input detect CLK10...

Страница 39: ...following instructions describe the simple procedure of installing the L Mount kit and your modular oscilloscopes into the chassis 1 Unpack the L Mount kit from the packaging 2 Remove both the rubber...

Страница 40: ...ensure that the 55 pin back pane connector is at the bottom side of the modular oscilloscope 5 Your modular oscilloscope is ready to be plug into an instrument chassis Using the Philip screw driver s...

Страница 41: ...Getting Started 1 U2701A U2702A USB Modular Oscilloscopes User s Guide 25 Soft Front Panel and User Interface Descriptions U2700A_Modular_Scope book Page 25 Tuesday May 6 2008 9 32 AM...

Страница 42: ...h display Displays the output of the data acquired 6 Scope control tabs Consists of all the sub functions of the oscilloscope 7 Measurement Results panel Displays the measurement results of the scope...

Страница 43: ...Technologies 2 Scope Features and Functions Analog Controls 28 Trigger Controls 40 Measurements and Cursors Controls 49 FFT Math Controls 60 Options Controls 70 AutoScale and Run Stop buttons 74 Pan a...

Страница 44: ...control which are used to set the waveform of the graph display Vertical Controls Vertical control is used to change the vertical scale and position of the waveform This section of the manual describe...

Страница 45: ...s F5 To display waveform from channel 2 click on or press F6 Toggle Channel On Off Click on the channel buttons on the vertical control panel or on the toolbar to toggle the channel on or off To toggl...

Страница 46: ...s used to remove any DC offset voltage on a waveform By setting the coupling control to AC the DC offset voltage is removed from the input waveform To remove any DC offset voltage from channel 1 click...

Страница 47: ...ed waveform the trigger is also inverted as well Click on the Stop button to stop the signal acquisition To invert the waveform on channel 1 click on the button on the soft front panel Click on the ch...

Страница 48: ...eform that are not important to the analysis of the waveform To remove high frequency components from the waveform on channel 1 click on the button on the soft front panel Click on the Channel Options...

Страница 49: ...nnel 1 click on the button on the soft front panel Click on the channel options button and select Attenuation from the options list An option list containing the attenuation factors in 1X 10X 100X wil...

Страница 50: ...se the sensitivity of the channel Click on the or press Ctrl Plus to decrease the sensitivity of the channel Channel 2 Click on the or press Alt Minus to increase the sensitivity of the channel Click...

Страница 51: ...Sweep is being used Horizontal controls allows you to adjust the horizontal scale and position of waveforms The horizontal center of the screen is the time reference for waveforms Changing the horizon...

Страница 52: ...rom the drop down list provided to adjust the horizontal sweep speed Delay Delay setting allows you to set the specific location of the trigger event with respect to the time reference position When t...

Страница 53: ...tions The oscilloscope offers three types of horizontal mode functions Main mode Roll mode and XY mode Main Mode Main mode displays the normal viewing mode for the waveform graph display NOTE The osci...

Страница 54: ...n time base of 500 ms div and slower If the current time base setting is faster than the 500 ms div limit it will be set to 500 ms div when the Roll mode is entered Use Roll mode on low frequency wave...

Страница 55: ...amplitude is plotted on the Y axis The cursors can be used to make measurements on XY mode waveforms To use the XY horizontal mode 1 Connect a sine wave signal to channel 1 and a sine wave signal of t...

Страница 56: ...is set up correctly it can convert unstable displays or blank screens into meaningful waveforms The oscilloscope acquires data while waiting for the trigger condition to occur After it detects a trigg...

Страница 57: ...tting Since there are no edges on which to trigger Auto trigger mode is used to display a DC signal Normal Trigger Mode If you only want to acquire specific events as specified by the trigger settings...

Страница 58: ...r Panel Controls Menu Settings Comments Trigger Mode Auto Able to acquire waveform even when no trigger occurs Normal Acquires waveform only when trigger occurs Source Channel 1 Sets Channel 1 as the...

Страница 59: ...Enter the desired holdoff time and unit then click on Set to proceed 5 Select the desired slope on the Edge Trigger Settings panel Coupling LF Reject Sets the input coupling to low frequency reject H...

Страница 60: ...gger occurs Normal Acquires waveform only when trigger occurs Source Channel 1 Sets Channel 1 as the trigger source Channel 2 Sets Channel 2 as the trigger source External Sets External as the trigger...

Страница 61: ...e and unit then click on Set TV Trigger TV triggering is used to trigger on fields or lines of NTSC PAL or SECAM standard video waveforms When TV is selected the trigger coupling is set to AC Table 2...

Страница 62: ...riod before starting a new trigger Standard NTSC PAL SECAM Generic Trigger on an NTSC PAL SECAM or GENERIC TV waveform Mode Odd Field Trigger on the rising edge of the first serration pulse of odd fie...

Страница 63: ...SECAM 1 to 313 314 to 625 Generic 1 to 1024 1 to 1024 NOTE Line Number Represents Count In Generic mode the line number represents the number of a count instead of a real line number Line Field 1 and...

Страница 64: ...bles the triggering waveforms of as low as 0 Hz without large DC offsets to be captured AC coupling enables the triggering waveforms with large DC offsets to be captured LF Reject coupling places a 35...

Страница 65: ...and Cursors Controls The Measurements Cursors button is located on the toolbar of the soft front panel Click on the to activate the automatic measurements and cursors system Figure 2 6 Soft front pane...

Страница 66: ...anually on the graph for customized measurements This will enable the Cursors panel Off will disable the graph markers from the graph display Cursors Cursors are used to make custom voltage or time me...

Страница 67: ...the voltage difference between the two cursors Y2 minus Y1 Delta Y denotes the voltage difference To configure Auto marker The Auto marker function will automatically place indicators on the waveform...

Страница 68: ...for different measurements Figure 2 7 shows the sample marker horizontal line in orange color automatically marks the maximum value of the waveform displayed when Maximum measurement type is selected...

Страница 69: ...ect Manual at the Markers property The Cursors panel will be activated once Manual is selected 3 Select Channel 1 or Channel 2 as desired Then select X Cursors or Y Cursors to define the measurements...

Страница 70: ...rols The U2701A U2702A modular oscilloscopes offers 26 types of automatic measurements You can select any of the following predefined measurements to measure the waveforms Figure 2 8 Automatic measure...

Страница 71: ...e mid threshold of the next falling edge Frequency Measure the frequency of a waveform Period Measure the period of a waveform the time between the mid threshold crossings of two consecutive like pola...

Страница 72: ...is a waveform distortion which follows a major edge transition Peak to Peak Measure peak to peak voltage of a waveform VMax VMin Preshoot Measure the preshoot voltage in percentage of a waveform Presh...

Страница 73: ...tage Average Measure average magnitude of a waveform Maximum Measure the absolute maximum magnitude of a waveform Minimum Measure the absolute minimum magnitude of a waveform Peak to Peak Measure peak...

Страница 74: ...Measurements panel The Measurements Results panel is displayed at bottom of the graph To select single or multiple measurements 1 Drag and drop a measurement Click on the desired measurement icon whil...

Страница 75: ...lect the measurement that you would like to reset and click on the button To reset all measurements click on the header of the reset column Reset To delete a measurement select the measurement that yo...

Страница 76: ...702A Modular Oscilloscopes User s Guide FFT Math Controls The FFT Math button is located on the toolbar of the soft front panel Figure 2 10 Soft front panel of the FFT Math controls U2700A_Modular_Sco...

Страница 77: ...d source and transforms it to the frequency domain When the FFT function is selected the FFT spectrum is plotted on the graph display as magnitude in dBV versus frequency The readout for the horizonta...

Страница 78: ...ng Rectangular Best frequency resolution worst magnitude resolution This is essentially the same as no window Transients or bursts the waveform levels before and after the event are nearly equal Equal...

Страница 79: ...ngs tab select the desired Window Rectangular Hanning Hamming BlackmanHarris Flattop 4 To reduce the noise floor of the waveform click on the Random Dither checkbox The horizontal scale span which is...

Страница 80: ...Scope Features and Functions 64 U2701A U2702A Modular Oscilloscopes User s Guide Figure 2 12 Waveform obtained with Hanning window selected U2700A_Modular_Scope book Page 64 Tuesday May 6 2008 9 32 A...

Страница 81: ...n is enabled you will see an indicator on your spectrum pointing at the first peak of your spectrum as shown Figure 2 13 4 To find the subsequent peaks in descending order of your spectrum click on th...

Страница 82: ...2 Scope Features and Functions 66 U2701A U2702A Modular Oscilloscopes User s Guide Figure 2 13 First Peak Figure 2 14 Next Peak U2700A_Modular_Scope book Page 66 Tuesday May 6 2008 9 32 AM...

Страница 83: ...o toggle the orientation of the channel math computation when selected By default the orientation is Channel 1 Math operation Channel 2 When this option is enabled the orientation will be reversed to...

Страница 84: ...fset of the computed waveform by using the knob or the arrow keys to adjust the offset value 4 Click on the Active Reverse Function checkbox to reverse the channels computation if desired This allows...

Страница 85: ...cope Features and Functions 2 U2701A U2702A USB Modular Oscilloscopes User s Guide 69 Figure 2 15 Acquired waveform using Subtract function U2700A_Modular_Scope book Page 69 Tuesday May 6 2008 9 32 AM...

Страница 86: ...es User s Guide Options Controls To display the Acquisition Mode menu and Display Options menu click on the button on the toolbar on the soft front panel Figure 2 16 Soft front panel of the Options Co...

Страница 87: ...on Peak Detect mode captures the maximum and minimum values of a waveform over multiple acquisitions Table 2 9 List of Acquisition Modes Menu Settings Comments Mode Normal Normal acquisition mode is f...

Страница 88: ...ints by using digital interpolation Sin x x interpolation is used to expand the horizontal signal resolution when the horizontal scale is set to 100 ns or faster To perform interpolation using sin x x...

Страница 89: ...forms to look for timing violations or to capture events that occur infrequently Clear Display clears the previous acquisitions on the graph display Then the oscilloscope will again start to accumulat...

Страница 90: ...orm auto scaling on your acquired signals 1 Once you have obtained a running signal click on on the oscilloscope toolbar or via Tools menu 2 The auto scaling may take awhile for the application to ana...

Страница 91: ...to examine waveform detail after the waveform has been acquired is a benefit generally associated with digital oscilloscopes Often this is simply the ability to freeze the display for the purpose of m...

Страница 92: ...2 Scope Features and Functions 76 U2701A U2702A Modular Oscilloscopes User s Guide Figure 2 19 Zoom In Figure 2 20 Zoom Out U2700A_Modular_Scope book Page 76 Tuesday May 6 2008 9 32 AM...

Страница 93: ...utton on the toolbar or press Ctrl 1 3 On Delay panel use the or arrow key to pan your graph right or left You may also turn the knob to control the panning To know if there is any panning movement us...

Страница 94: ...2 Scope Features and Functions 78 U2701A U2702A Modular Oscilloscopes User s Guide U2700A_Modular_Scope book Page 78 Tuesday May 6 2008 9 32 AM...

Страница 95: ...d Specifications Specifications 80 Characteristics 81 Product Characteristics and General Specifications 85 Measurement Category 87 This chapter specifies the characteristics and specifications of Agi...

Страница 96: ...are valid after a 30 minute warm up period and within 10 C from firmware calibration temperature Vertical System oscilloscope channels Bandwidth 3 dB U2701A DC to 100 MHz U2702A DC to 200 MHz Scope ch...

Страница 97: ...annel Normal 32 Mpts 16 Mpts Single shot 64 Mpts 32 Mpts Vertical resolution 8 bits Peak detection Yes Averaging Any number from 1 to 999 Filter Sin x x interpolation for time base 1 ns to 100 ns Swee...

Страница 98: ...cale Single cursor accuracy DC vertical gain accuracy DC vertical offset accuracy 0 2 full scale 1 2 LSB Example for 50 mV signal scope set to 10 mV div 80 mV full scale 5 mV offset accuracy 4 0 80 mV...

Страница 99: ...tandard television waveforms NTSC PAL SECAM TV trigger sensitivity 0 6 division of sync signal Modes supported include Field 1 Field 2 all fields or any line within a field AutoScale Single button aut...

Страница 100: ...st standard deviation cycle RMS RMS AC Time Frequency period width width duty cycle duty cycle rise time fall time delay phase Frequency Maximum Peak Cursors Modes Manual Type Time voltage and frequen...

Страница 101: ...densing Altitude up to 2000 meters Operating and non operating Pollution degree 2 For indoor use only Storage Compliance Storage temperature from 20 C to 70 C Storage humidity at 5 90 R H Non condensi...

Страница 102: ...Specifications Dimension 117 00 mm x 180 00 mm x 41 00 mm with rubber bumpers 105 00 mm x 175 00 mm x 25 00 mm without rubber bumpers Weight 534 g with rubber bumpers 482 g without rubber bumpers Warr...

Страница 103: ...to the low voltage installation Examples are measurements on household appliances portable tools and similar equipment Measurement CAT III are measurements performed in the building installation Exam...

Страница 104: ...88 U2701A U2702A Modular Oscilloscopes User s Guide 3 Characteristics and Specifications U2700A_Modular_Scope book Page 88 Tuesday May 6 2008 9 32 AM...

Страница 105: ...U2700A_Modular_Scope book Page 95 Tuesday May 6 2008 9 32 AM...

Страница 106: ...10 0189 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 2...

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