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Agilent Technologies Agilent 35670A manual Frequency Zooming to Increase Resolution

Models: Agilent 35670A

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Section 5 : Improving Measurement Results

AGILENT 35670A

Supplemental Operator’s Guide

Section 5 : Improving Measurement Results

Frequency Zooming to Increase Resolution

The AGILENT 35670A has the ability to zoom in on a signal to show detail with very fine resolution. After choosing a center frequency, it is possible to decrease the span and therefore increase the resolution all the way down to 61 ∝Hz. To zoom in on a signal, move the marker to the desired center frequency, then:

•Press the [Freq] hardkey.

•Press the [CENTER] softkey (F2).

•Press the [Mkr Value] hardkey.

To set a new, lower span,

•Press the [Freq] hardkey.

•Press the [Down Arrow] hardkey

•Press the yellow [Start] hardkey to begin the zoomed measurement.

To return to baseband measurements,

•Press the [Freq] hardkey.

•Press the [ZERO START] softkey (F5).

Maximizing Dynamic Range

The default setting for input range is CH1 AUTO RANGE. For steady-state signals this works well because the front end will find the input range that just exceeds the signal level, and therefore maximize the dynamic range of the measurement. When a front end is set up to autorange and the signal either overloads or becomes too faint for the current range setting, the analyzer automatically searches for a new range and then re-starts the measurement. To select CH1 AUTO RANGE:

•Select the [CH1 AUTO RANGE] softkey (F6)

If a signal is not steady, but has periods of high and low levels, then CH1 AUTO RANGE may not set the front end at the most useful range. Instead, try CH1 AUTO UP ONLY. This causes the input range to ratchet up when an overload is detected, however when the signal is quiet, the front end range is not reduced. This prevents an overload if another high level signal is expected. CH1 AUTO UP ONLY works well with transient signals such as those expected during impact testing. To set up this condition:

•Press the [Input] hardkey.

•Select the [CH1 AUTO UP ONLY] softkey (F5).

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Agilent Technologies Agilent 35670A manual Frequency Zooming to Increase Resolution, Maximizing Dynamic Range

Contents

for the Agilent 35670A Dynamic Signal Analyzer Supplemental Operator’s GuideAGILENT 35670A Supplemental Operator’s Guide SECTION 13 ORDER DOMAIN RESULTS IN LIST MODE SECTION 24 PLOTTING AND PRINTING TRACE DATA Section 1 Turning On the AGILENT 35670A Inst Mode Meas DataTrac Coord Coord A FreqUsing ICP-TypeTransducers with the AGILENT 35670A Using Transducers with External PreamplifiersSection 3 Measuring with Transducers Specifying Transducer Sensitivity and Units Setting Up Transducer Units for Displacement Selecting Single Channel OperationSelecting Frequency Span Frequency Spans Available for the AGILENT 35670A Quantifying Power Spectrum Results Frequency Zooming to Increase Resolution Maximizing Dynamic RangeSection 5 Improving Measurement Results Averaging to Reduce Measurement Variance AGILENT 35670A Supplemental Operator’s Guide AGILENT 35670A Supplemental Operator’s Guide Selecting Single Channel OperationSelecting Time Record Length Displaying Time WaveformsEvent Triggering Quantifying Time Trace Results Presetting the Analyzer Selecting Dual Channel OperationSection 7 Measuring Dual Channel Spectra Selecting Frequency SpanUsing Markers with Dual Channel Measurements Coupled Markers Coupled Markers with Peak TrackingDual Channel Averaging Maximizing Dynamic RangeAGILENT 35670A Supplemental Operator’s Guide Displaying Dual Time Waveforms Section 9 Measuring Dual Channel Time WaveformsSelecting Dual Channel Operation Selecting Time Record LengthArming Dual Channel Time Measurements Triggering a Dual-ChannelTime MeasurementTrigger Delay Using Markers with Dual Channel Time Measurements AGILENT 35670A Supplemental Operator’s Guide Setting Up the Transducer Parameters Setting Up Input Range Choosing a Preliminary Frequency SpanSpecifying Trigger Parameters Setting Up Time Displays WAITING FOR CH 1 TRIGGERUsing Force/Response Windows Displaying Hammer Test Results AveragingAGILENT 35670A Supplemental Operator’s Guide Changing Frequency Span Delay = 01.T ForceWidth = T ExponentialDecay = TAGILENT 35670A Supplemental Operator’s Guide AGILENT 35670A Supplemental Operator’s Guide Section 13 Order Domain Results in List ModePrepare the order display as follows Prepare the order results list as followsAGILENT 35670A Supplemental Operator’s Guide To start taking measurementsSelecting Measurement Parameters Recalling the Spectra from Disk Recalling the Spectra from Non-VolatileRAMScaling the Displays Using Markers to Compare Setting Up the Waterfall Display Section 15 Waterfall Spectra at Time IntervalsSelecting Single Channel Operation Selecting Measurement ParametersSetting Up Time Step Arm Using Slice Markers with Waterfall DataAGILENT 35670A Supplemental Operator’s Guide Setting Up the Tachometer Specifying the Start RPMSection 16 Waterfall Spectra at RPM Intervals Starting and Pausing a Measurement Scaling the DisplayAGILENT 35670A Supplemental Operator’s Guide Accelerometer Polarity Set up triggering on Channel 1 to 5% of range AGILENT 35670A Supplemental Operator’s GuideSet up the AGILENT 35670A AGILENT 35670A Supplemental Operator’s GuideFor accelerometers with the same polarity For accelerometers with opposite polaritySet up display Set up trace coordinates as peak-to-peakmilAGILENT 35670A Supplemental Operator’s Guide AGILENT 35670A Supplemental Operator’s Guide AGILENT 35670A Supplemental Operator’s Guide Preset the AGILENT 35670A AGILENT 35670A Supplemental Operator’s GuideConnect the transducers Enter Channel 1 input parametersSet up display parameters AGILENT 35670A Supplemental Operator’s GuideChoose measurement parameters AGILENT 35670A Supplemental Operator’s Guide Viewing Results Using Real and Imaginary Traces AGILENT 35670A Supplemental Operator’s GuideAssessing Measurement Quality Preset the AGILENT 35670A Set up Trace B to measure velocity in inch/s 0-pkAGILENT 35670A Supplemental Operator’s Guide AGILENT 35670A Supplemental Operator’s Guide Press the Trace Coord hardkeyPress the Y UNITS softkey F8 Press the XDCR UNIT CONVERT softkey F4AGILENT 35670A Supplemental Operator’s Guide When the run-upand run-downis completed AGILENT 35670A Supplemental Operator’s GuideSpecify User Levels for Triggering Characterizing the External TriggerSetting Up External Trigger Acquire and Display the Trigger SignalCharacterize the Trigger Signal Set up a non-TTLtrigger as followsSet up measurement parameters AGILENT 35670A Supplemental Operator’s GuideConfirming Contents of 3.5” Disk File Saving Trace to 3.5” DiskConfirming Contents of NV-RAM Saving Trace to Non-VolatileRAM NV-RAMAGILENT 35670A Supplemental Operator’s Guide To return to the Trace viewRecall Trace From 3.5” Disk Recall Trace Data from Non-VolatileRAM NV-RAMAGILENT 35670A Supplemental Operator’s Guide Generating Output with the AGILENT 35670A Plotting the DisplaySection 24 Plotting and Printing Trace Data Printing the Display AGILENT 35670A Supplemental Operator’s GuideCheck the Plot/Print Destination Plot the TraceSection 25 Importing Plots into Microsoft Word Plot to a File Using the AGILENT 35670A Section 28 Precautions to Prevent Loss of Data Measuring Acceleration, Displaying Displacement Math Functions and XDCR UNIT CONVERT Converting Frequency Response Units to ComplianceAGILENT 35670A Supplemental Operator’s Guide Now display the function F1 on Trace BAGILENT 35670A Supplemental Operator’s Guide AGILENT 35670A Supplemental Operator’s Guide above the track numberSection Section