Agilent Technologies 24A, 54621D, 42A, 54621A, 22A, 41A manual LF Reject

Page 175

Making Measurements

To reduce the random noise on a signal

Low-frequency reject (LF reject) adds a high-pass filter with the 3-dB point at 50 kHz. Use LF reject to remove low-frequency signals, such as power line noise, from the trigger path.

0 dB

3 dB down point

Pass

Band

dc 50 kHz

LF Reject

Noise reject increases the trigger hysteresis band. By increasing the trigger hysteresis band, you reduce the possibility of triggering on noise. However, this also decreases the trigger sensitivity so that a slightly larger signal is required to trigger the oscilloscope.

Random noise on the displayed waveform

5-7

Image 175

Contents Agilent 54621D/22D/41D/42D Mixed-Signal Oscilloscopes Utilities Display shows current input signalsHorizontal Controls select sweep speed and delay parameters Softkeys extend the functionality of command keysThis Book Page Contents Trigger Types ContentsRun/Stop/Single/Infinite Persistence Operation Using Labels on the Mixed-Signal OscilloscopeCursor Measurements Saving and Recalling Traces and SetupsCapturing Data Math FunctionsUtilities Contents-6 Getting Started Getting Started Getting Started Setting up the Oscilloscope To inspect package contents To inspect package contents Package contents for 54620/40-Series Oscilloscopes To inspect options and accessories To inspect options and accessoriesModel Description To inspect options and accessories Accessories availablePlug Type Cable Part Number To inspect options and accessories Power CordsDisconnect power from the instrument To clean the oscilloscopeTo clean the oscilloscope To adjust the handle To adjust the handlePress the power switch To power-on the oscilloscopeTo power-on the oscilloscope To adjust the waveform intensity To adjust the waveform intensityTo connect the oscilloscope analog probes To connect the oscilloscope analog probesTo compensate your analog probe To compensate your analog probePress Autoscale To use the digital probes mixed-signal oscilloscope only To use the digital probes mixed-signal oscilloscope onlyConnect the clip to a node in the circuit you want to test Signal Lead Ground Lead Clip Signals Ground To connect an RS-232 cable To connect a printerTo connect a printer Press the Autoscale key on the front panel To verify basic oscilloscope operationTo verify basic oscilloscope operation Getting started using the oscilloscope interface To verify basic oscilloscope operation Using Quick Help Getting Started Loading an updated language file from floppy disk Loading an updated language file from floppy diskPage Front-Panel Overview Front-Panel Overview Important Oscilloscope Considerations Using Single versus Run/StopUsing Auto trigger mode versus Normal trigger mode Viewing signal detail with acquire modeImportant Oscilloscope Considerations Using Vectors Display menu Post Acquisition Processing Delayed Sweep54620/40-series Oscilloscope Front Panels 54620/40-series Oscilloscope Front Panels54624A 4-Channel Oscilloscope Front Panel Entry knob Autoscale key Softkeys 54621D, 54622D D, and 54642D digital channels Front-Panel OperationInterpreting the display Interpreting the displayTo use analog channels to view a signal To use analog channels to view a signalExample To use digital channels to view a signal To use digital channels to view a signalUndo Autoscale To display signals automatically using AutoscaleTo display signals automatically using Autoscale How Autoscale WorksTo apply the default factory configuration To apply the default factory configurationMeasurement Hints To adjust analog channel vertical scaling and positionCenter the signal on the display using the position knob To adjust analog channel vertical scaling and positionTo set analog channel probe attenuation factor To set the vertical expand reference for the analog signalExpand About Center To display and rearrange the digital channels To display and rearrange the digital channelsTo operate the time base controls Press the Main/Delayed, then press the Vernier softkeyTo operate the time base controls To start and stop an acquisition First set trigger Mode/Coupling Mode softkey to NormalTo start and stop an acquisition To make a single acquisitionPress Main/Delayed To use delayed sweepPress the Delayed softkey To use delayed sweepTo make cursor measurements To make cursor measurementsChoose what measurement you want on that source by pressing To make automatic measurementsTo make automatic measurements To print the display To modify the display gridTo modify the display grid Triggering the Oscilloscope Triggering the Oscilloscope Trigger Out connectorSelecting Trigger Modes and Conditions To select the Mode and Coupling menuTo select a trigger mode Normal, Auto, Auto Level To select a trigger mode Normal, Auto, Auto LevelAuto Level and Auto modes Normal mode To select Noise Reject and HF Reject To select trigger CouplingTo select trigger Coupling To set holdoff To set holdoffTo set holdoff Holdoff Operating Hints External Trigger Input External Trigger Probe SettingsExternal Trigger Input Previous menu MegaZoom Technology Simplifies Triggering Trigger TypesSelect 1, 2, Ext, or Line as the trigger source To use Edge triggeringTo use Edge triggering To use Edge triggering To use Pulse Width triggering To use Pulse Width triggeringPress the qualifier softkey to select the time qualifier Qualifier time set softkey Qualifiers can be set as followsTo use Pattern triggering To use Pattern triggeringSpecifying an Edge in a Pattern To use can triggering To use can triggeringPress the Trigger softkey to select the trigger condition Press the Baud softkey to set the can signal baud rateTo use Duration triggering To use Duration triggeringTo use Duration triggering When the duration trigger occurs To use I2C triggering To use I2C triggeringAck Data Stop Start Address R/W Condition Frame Start Addr7 Read Ack Data or Condition 26th clock edge To use I2C triggering To use Sequence triggering To use Sequence triggeringSequence Selected Press the Find softkey and select the Find stage condition Press the Stage softkey and select FindEdge Pattern 1 and Edge Edge Pattern 2 and Edge Nth Edge Press the Stage softkey and select Trigger onEdge 1 or Pattern 1 and Edge Timeout Press the Stage softkey and select Reset onTo use Sequence triggering To use SPI triggering To use SPI triggeringResetting all bits in the serial data string to one value Assign source channels to the clock, data, and frame signals To use SPI triggering To use SPI triggering To use TV triggering To use TV triggeringTo use TV triggering Provide Correct Matching Press the Mode softkey to select the TV triggering modeTV standard Field Alt Field Alternate Triggering To trigger on a specific line of videoLine Number Represents Count Line Numbers per Field for Each TV StandardTo trigger on all TV line sync pulses To trigger on a specific field of the video signal To trigger on all fields of the video signal To trigger on odd or even fields Holdoff Settings To use USB triggering To use USB triggeringTo use USB triggering Trigger Out connector MegaZoom Concepts and Oscilloscope Operation MegaZoom Concepts and Oscilloscope Operation MegaZoom Concepts Deep Memory Deep MemoryMemory depth values Oscilloscope Responsiveness Oscilloscope ResponsivenessMegaZoom Technology Display Update Rate Display Update RateTo setup the Analog channels To setup the Analog channelsTurning channels off To setup the Analog channels Press the BW Limit softkey to turn on bandwidth limiting Press the Imped impedance softkeyPress the Invert softkey to inverted the selected channel Press the Probe softkey to display the channel probe menu Main mode To setup the Horizontal time basePress the Main softkey to select Main horizontal mode To setup the Horizontal time basePress the Vernier softkey to turn on the time base vernier To setup the Horizontal time base Delayed mode To setup the Horizontal time base XY mode Roll modePress the Acquire key to display the Acquire menu Acquisition ModesAcquisition Modes Peak Detect All points displayed after Single or StopSmoothing # Avgs=1 or High-resolution mode Average ModeRealtime Mode Clear display Display modesPress the Display key to view the Display menu Infinite PersistenceVectors On/Off Pan and Zoom Pan and ZoomZoom To pan and zoom a waveform To pan and zoom a waveformRun/Stop/Single/Infinite Persistence Operation Acquiring Data Acquiring DataSingle versus Run/Stop Single Memory Depth/Record LengthMemory Depth/Record Length Run/Stop versus SingleTo run and stop an acquisition To run and stop an acquisitionTo take a single trace Press the Single keyOperating Hints Connect a signal to the oscilloscope Set up the triggerTo capture a single event To capture a single eventTo use infinite persistence To use infinite persistenceClearing stored infinite persistence waveforms Press the Display key, then press the Clear Display softkey To clear the waveform displayTo clear the waveform display To display digital channels using Autoscale Configuring the Mixed-Signal OscilloscopeInterpreting the digital waveform display Activity indicatorInterpreting the digital waveform display List of stacked channels To turn individual channels on and off To turn individual channels on and offDisplayed To force all channels on or all channels offTo change the display size of the digital channels Press the Turn on or Turn off softkeyTo change the logic threshold for digital channels To change the logic threshold for digital channelsUsing Digital Channels to Probe Circuits Using Digital Channels to Probe CircuitsInput Impedance High-Frequency Probe Equivalent Circuit Probe Grounding Best Probing Practices Using Labels on the Mixed-Signal Oscilloscope To turn the label display on or off To turn the label display on or offPress the Label key To assign a predefined label to a channelTo assign a predefined label to a channel To define a new label Label Assignment Auto-Increment FeaturesTo define a new label To define a new label Label List Management Defaulting labels without erasing the default library To reset the label library to the factory defaultPress the Default Library softkey To reset the label library to the factory defaultPress the Save/Recall key to display the Save/Recall menu Saving and Recalling Traces and SetupsMaking a hardcopy print To Autosave traces and setups To Autosave traces and setupsMegaZoom Concepts and Oscilloscope Operation To save traces and setups to a new file on the floppy disk To save traces and setups to a new file on the floppy diskTo create a new file name, press the New File softkey To recall traces and setups To recall traces and setupsRecalling overwrites current settings Press the CSV, TIF, or BMP softkey Saving printing screen images to floppy diskSaving printing screen images to floppy disk Recalling the factory default setup Recalling the factory default setupMaking Measurements Concepts about the 54620/40-series Oscilloscopes Making MeasurementsCapturing Data Main and Delayed SweepMaking Measurements To use delayed sweep To reduce the random noise on a signal To reduce the random noise on a signalLF Reject Press the Acquire key, then press the Averaging softkey Use averaging to reduce noise on the displayed waveformSmoothing # Avgs=1 or High-resolution mode Making Measurements Characterize the glitch with delayed sweep Press the Main/Delayed key, then press the Roll softkey To use the Roll horizontal modeTo use the Roll horizontal mode To use the XY horizontal mode To use the XY horizontal modeSignal centered on the display Calculate the phase difference using the formula below Signals are 90 out of phase Signals are in phase Math Operating Hints Math FunctionsMath Scale and Offset Math Scale and OffsetMath Scale and Offset are Set Automatically Multiply MultiplySubtract SubtractDifferentiate DifferentiateFigure below shows an example of differentiate Integrate IntegrateIntegrate and Signal Offset FFT Measurement FFT MeasurementAliasing FFT Operation Scale and offset considerations FFT Measurement Hints FFT Measurement FFT Measurement Hints Cursor Measurements To make cursor measurements Select the X and Y softkeys to make a measurement Cursor Examples Cursors measure frequency of pulse ringing Measuring pulse width with cursors Preshoot Overshoot Phase DelayAutomatic Measurements Average Amplitude Base Maximum Minimum Peak-to-Peak RMS TopMaking automatic measurements Making automatic measurementsDigital channel time measurements Making time measurements automaticallyMaking time measurements automatically FFT measurementsPeriod CounterDuty Cycle FrequencyWidth Making time measurements automatically Fall TimeRise Time + WidthIsolating an event for frequency measurement Making time measurements automatically At MinDigital channel measurements Making Delay and Phase MeasurementsMaking Delay and Phase Measurements DelayPhase Measurement Making voltage measurements automatically Making voltage measurements automaticallyMath Measurements and Units Measurement definitions Top Using delayed sweep to isolate a pulse for Top measurementMaking overshoot and preshoot measurements Making overshoot and preshoot measurementsPreshoot Making overshoot and preshoot measurements Overshoot Page Utilities Utilities To configure Quick Help languages To configure Quick Help languagesLanguage Info softkey Loading an updated language file from floppy diskTo update your instrument to the latest application software To configure a printer To configure a printerPress the Format softkey to select the print format Form feed CSV lengthScale factors Gray scale printingTo use the floppy disk Deleted files cannot be recoveredTo use the floppy disk Press the Baud softkey to set the RS-232 baud rate To set up the I/O port to use a controllerTo set up the I/O port to use a controller Press the XON DTR softkey to set the RS-232 handshakeRS-232 Connections Pin Number SignalTo set the clock To set the clockTo set up the screen saver To set up the screen saverPress the Saver softkey to select the screen saver type To set up the screen saver User Cal To perform service functionsTo perform service functions Press Start User Cal to start the routineSelf test User Cal StatusAbout Oscilloscope Expand softkey Default Library softkey mixed-signal oscilloscopes onlyTo set other options To set other optionsPerformance Characteristics Performance Characteristics Acquisition Analog Channels Agilent 54620-series Performance CharacteristicsAcquisition Digital Channels on 54621D and 54622D only Vertical System Analog Channels Agilent 54620-series Performance CharacteristicsAccuracy = ±2.0%80 mV + 0.4%80 mV = ±1.92 mV Vertical System Digital Channels 54621D and 54622D onlySample rate of 200/400 MSa/s HorizontalCan Trigger SystemDigital D15 D0 Channel Triggering 54621D and 5462 2D Analog Channel TriggeringExternal EXT Triggering Display System Measurement FeaturesStorage FFTPower Requirements General CharacteristicsInstallation categories Agilent 54620-series Performance Characteristics Acquisition Digital Channels on 54641D and 54642D only Agilent 54640-series Performance CharacteristicsAgilent 54640-series Performance Characteristics Vertical System Digital Channels 54641D and 54642D only Range Ns/div to 50 s/div Resolution Vernier Minimum pulse width setting 2 ns Digital D15 D0 Channel Triggering 54641D and 54642D Display System Window Rectangular, Flattop, Hanning Noise Floor General Characteristics Page Numerics IndexMissing acknowledge condition, I2C trigger IndexIndex-3 Index-4 Declaration of Conformity EMC Product RegulationsDeclaration of Conformity Product Regulations Safety Agilent Technologies, Inc Document Warranty

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