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Agilent Technologies Agilent 35670A manual Accelerometer Polarity

Models: Agilent 35670A

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Accelerometer Polarity

AGILENT 35670A

Supplemental Operator’s Guide

Section 17 : Two-Channel Absolute and Differential Amplitude Measurement

Measuring the relative motion between points on a machine can provide information regarding clearances and forces. These measurements may also demonstrate a susceptibility of a machine to a particular mode of vibration.

Absolute motion can be measured as a power spectrum, with units of peak-to-peak displacement in mils. Relative motion is measured as the vector difference between two channels. It also can be displayed with units of peak-to-peak displacement in mils.

When acquiring these measurements, it is very important to know the relative polarity of each transducer. If their polarity is opposite, then the signals must be added, not subtracted, to obtain differential motion.

The best technique is to use two identical accelerometers. If the transducers are not the same model, then it is best to determine their relative polarity.

Accelerometer Polarity

To determine the polarity of two accelerometers, follow these steps:

•Press the green [Preset] hardkey

•Press [DO PRESET] softkey (F1).

•Press the [Pause/Cont] hardkey if desired.

•Press the [Freq] hardkey

•Enter 3200 and then press the [Hz] softkey (F2).

•Press the [Input] hardkey.

•Press the [ALL CHANNELS] softkey (F2).

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

Set up transducer parameters as described in the section “Measuring with Transducers.” Then follow these steps to display a time trace of the two accelerometers:

•Press the [Disp Format] hardkey.

•Press the [UPPER/LOWER] softkey (F3).

•Press the [Active Trace] hardkey.

•Press the [A] softkey (F1)

•Press the [Meas Data] hardkey.

• Press the [CHANNEL 1 2 3 4] softkey (F1) until 1 is highlighted.

•Press the [TIME CHANNEL 1] softkey (F5)

•Press the [Scale] hardkey.

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Agilent Technologies Agilent 35670A manual Accelerometer Polarity

Contents

Supplemental Operator’s Guide for the Agilent 35670A Dynamic Signal AnalyzerAGILENT 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 Meas Data Inst ModeTrac Coord Coord A FreqUsing Transducers with External Preamplifiers Using ICP-TypeTransducers with the AGILENT 35670ASection 3 Measuring with Transducers Specifying Transducer Sensitivity and Units Selecting Single Channel Operation Setting Up Transducer Units for DisplacementSelecting Frequency Span Frequency Spans Available for the AGILENT 35670A Quantifying Power Spectrum Results Maximizing Dynamic Range Frequency Zooming to Increase ResolutionSection 5 Improving Measurement Results Averaging to Reduce Measurement Variance AGILENT 35670A Supplemental Operator’s Guide Selecting Single Channel Operation AGILENT 35670A Supplemental Operator’s GuideDisplaying Time Waveforms Selecting Time Record LengthEvent Triggering Quantifying Time Trace Results Selecting Dual Channel Operation Presetting the AnalyzerSection 7 Measuring Dual Channel Spectra Selecting Frequency SpanUsing Markers with Dual Channel Measurements Coupled Markers with Peak Tracking Coupled MarkersMaximizing Dynamic Range Dual Channel AveragingAGILENT 35670A Supplemental Operator’s Guide Section 9 Measuring Dual Channel Time Waveforms Displaying Dual Time WaveformsSelecting Dual Channel Operation Selecting Time Record LengthTriggering a Dual-ChannelTime Measurement Arming Dual Channel Time MeasurementsTrigger Delay Using Markers with Dual Channel Time Measurements AGILENT 35670A Supplemental Operator’s Guide Setting Up the Transducer Parameters Choosing a Preliminary Frequency Span Setting Up Input RangeSpecifying Trigger Parameters WAITING FOR CH 1 TRIGGER Setting Up Time DisplaysUsing Force/Response Windows Averaging Displaying Hammer Test ResultsAGILENT 35670A Supplemental Operator’s Guide Delay = 01.T ForceWidth = T ExponentialDecay = T Changing Frequency SpanAGILENT 35670A Supplemental Operator’s Guide Section 13 Order Domain Results in List Mode AGILENT 35670A Supplemental Operator’s GuidePrepare the order display as follows Prepare the order results list as followsTo start taking measurements AGILENT 35670A Supplemental Operator’s GuideSelecting Measurement Parameters Recalling the Spectra from Non-VolatileRAM Recalling the Spectra from DiskScaling the Displays Using Markers to Compare Section 15 Waterfall Spectra at Time Intervals Setting Up the Waterfall DisplaySelecting Single Channel Operation Selecting Measurement ParametersUsing Slice Markers with Waterfall Data Setting Up Time Step ArmAGILENT 35670A Supplemental Operator’s Guide Specifying the Start RPM Setting Up the TachometerSection 16 Waterfall Spectra at RPM Intervals Scaling the Display Starting and Pausing a MeasurementAGILENT 35670A Supplemental Operator’s Guide Accelerometer Polarity AGILENT 35670A Supplemental Operator’s Guide Set up triggering on Channel 1 to 5% of rangeAGILENT 35670A Supplemental Operator’s Guide Set up the AGILENT 35670AFor accelerometers with the same polarity For accelerometers with opposite polaritySet up trace coordinates as peak-to-peakmil Set up displayAGILENT 35670A Supplemental Operator’s Guide AGILENT 35670A Supplemental Operator’s Guide AGILENT 35670A Supplemental Operator’s Guide AGILENT 35670A Supplemental Operator’s Guide Preset the AGILENT 35670AConnect the transducers Enter Channel 1 input parametersAGILENT 35670A Supplemental Operator’s Guide Set up display parametersChoose measurement parameters AGILENT 35670A Supplemental Operator’s Guide AGILENT 35670A Supplemental Operator’s Guide Viewing Results Using Real and Imaginary TracesAssessing Measurement Quality Set up Trace B to measure velocity in inch/s 0-pk Preset the AGILENT 35670AAGILENT 35670A Supplemental Operator’s Guide Press the Trace Coord hardkey AGILENT 35670A Supplemental Operator’s GuidePress the Y UNITS softkey F8 Press the XDCR UNIT CONVERT softkey F4AGILENT 35670A Supplemental Operator’s Guide AGILENT 35670A Supplemental Operator’s Guide When the run-upand run-downis completedCharacterizing the External Trigger Specify User Levels for TriggeringAcquire and Display the Trigger Signal Setting Up External TriggerCharacterize the Trigger Signal Set up a non-TTLtrigger as followsAGILENT 35670A Supplemental Operator’s Guide Set up measurement parametersSaving Trace to 3.5” Disk Confirming Contents of 3.5” Disk FileSaving Trace to Non-VolatileRAM NV-RAM Confirming Contents of NV-RAMAGILENT 35670A Supplemental Operator’s Guide To return to the Trace viewRecall Trace Data from Non-VolatileRAM NV-RAM Recall Trace From 3.5” DiskAGILENT 35670A Supplemental Operator’s Guide Plotting the Display Generating Output with the AGILENT 35670ASection 24 Plotting and Printing Trace Data AGILENT 35670A Supplemental Operator’s Guide Printing the DisplayCheck 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 Converting Frequency Response Units to Compliance Math Functions and XDCR UNIT CONVERTNow display the function F1 on Trace B AGILENT 35670A Supplemental Operator’s GuideAGILENT 35670A Supplemental Operator’s Guide above the track number AGILENT 35670A Supplemental Operator’s GuideSection Section