Agilent Agilent 35670A - Manuals

AGILENT 35670A Supplemental Operator’s Guide 3 Section 3 : Measuring with Transducers The AGILENT 35670A can be used with a broad range of transducers. Transducerscan use an external preamplifier to convert the raw signal into a voltage that iscompatible with the AGILENT 35670A. Some transducers hav...

AGILENT 35670ASupplemental Operator’s Guide 4 For example, if an accelerometer has am internal sensitivity of 25 pC/g, and a chargeamplifier has a gain setting of 10 mV/pC, then the resulting transducer sensitivity is250 mV/g. However is the gain setting on the charge amplifier is changed to 1mV/pC,...

AGILENT 35670A Supplemental Operator’s Guide 5 Section 4 : Measuring a Single Channel Power Spectrum - Displacement This section contains procedures for setting up and measuring a single channelpower spectrum of displacement using an AGILENT 35670A Dynamic SignalAnalyzer. Included are steps to selec...

AGILENT 35670ASupplemental Operator’s Guide 6 Any frequency below 51.2 kHz may of course be entered, however the analyzer willselect the lowest span that contains the desired frequency. For example, if 1200 Hzis entered, the analyzer is switched to a span of 1600 Hz. * Available in single-channel mo...

AGILENT 35670A Supplemental Operator’s Guide 7 Input CH1 Rng: 501.7819 mVpk CH2 Rng: 631.706 mVpk CH3 Rng: 2.5149 Vpk CH4 Rng: 2.5149 Vpk Date: 10-02-96 Time: 08:42:00 PM A: CH1 Pwr Spec X:160 Hz Y:169.558 mVrms 0Hz 800Hz 1 Vrms 1 uVrms LogMag 6 decades Quantifying Power Spectrum Results Use the mar...

AGILENT 35670ASupplemental Operator’s Guide 8 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 withvery fine resolution. After choosing a center frequency, it is possible to decrease thespan an...

AGILENT 35670A Supplemental Operator’s Guide 11 Section 6 : Measuring a Single Channel Time Waveform This section contains procedures for setting up and measuring a single channel timewaveform using an AGILENT 35670A Dynamic Signal Analyzer. Included aresteps to select single channel operation, set ...

AGILENT 35670ASupplemental Operator’s Guide 12 Selecting Time Record Length The default time record length at a frequency span of 51.2 kHz is only 7.8 ms, whichis usually not enough time to capture a mechanical event or observe a transducer’stime domain signal. To increase the time record length to ...

AGILENT 35670A Supplemental Operator’s Guide 13 • Press the [ARM] softkey (F9) again. Event Triggering The AGILENT 35670A has the ability to trigger the acquisition of a time waveformbased on the slope and level of the measured signal. To set up triggering properly,the polarity of the measured pulse...

AGILENT 35670ASupplemental Operator’s Guide 14 Input CH1 Rng: 1.0012 Vpk CH2 Rng: 631.706 mVpk CH3 Rng: 2.5149 Vpk CH4 Rng: 2.5149 Vpk Date: 10-02-96 Time: 08:47:00 PM A: CH1 Time X:38.0859 ms Y:1.06837 V -9.7656ms 489.7461ms 2.5 V -2.5 V Real 500 mV /div Quantifying Time Trace Results Use the marke...

AGILENT 35670A Supplemental Operator’s Guide 15 Section 7 : Measuring Dual Channel Spectra This section contains procedures for setting up and measuring a dual channelspectrum using an AGILENT 35670A Dynamic Signal Analyzer. Procedures aresimilar to those in the section “Measuring Single Channel Spe...

AGILENT 35670ASupplemental Operator’s Guide 16 • Press the [Meas Data] hardkey. • Press the [CHANNEL 1 2 3 4] softkey (F1) until 2 is highlighted. • Press the [Scale] hardkey. • Toggle the [AUTOSCALE ON OFF] softkey (F1) until ON is highlighted. Note: many of these keystrokes are not necessary if pe...

AGILENT 35670A Supplemental Operator’s Guide 17 Use the marker knob to read the amplitude at any measured frequency for Channel 1in Trace A. To set up the marker for Channel 2 in Trace B, • Press the [Active Trace] hardkey. • Press the [B] softkey (F2). • Press the [Marker] hardkey. • Toggle the [MA...

AGILENT 35670ASupplemental Operator’s Guide 18 Section 8 : Improving Dual Channel Measurement Results Maximizing Dynamic Range Autoranging to maximize the dynamic range of measurements in the AGILENT35670A can function on all channels simultaneously. Therefore all capabilitypreviously mentioned for ...

AGILENT 35670ASupplemental Operator’s Guide 20 Section 9 : Measuring Dual Channel Time Waveforms This section contains procedures for setting up and measuring a single channel timewaveform using an AGILENT 35670A Dynamic Signal Analyzer. Included aresteps to select single channel operation, set up t...

AGILENT 35670A Supplemental Operator’s Guide 21 • Press the [CHANNEL 1 2 3 4] softkey (F1) until 1 is highlighted. • Press the [TIME CHANNEL 1] softkey (F5) • Press the [Scale] hardkey. • Toggle the [AUTOSCALE ON OFF] softkey (F1) until ON is highlighted. . • Press the [Active Trace] hardkey. • Pres...

AGILENT 35670ASupplemental Operator’s Guide 22 Then set up trigger parameters (for a positive event, positive slope) as follows: • Press the [TRIGGER SETUP] softkey (F6) • Press the [CHANNEL LEVEL] softkey (F1) • Enter 5 then press the [PERCENT (%)] softkey (F4) • Press the [SLOPE POS NEG] softkey (...

AGILENT 35670A Supplemental Operator’s Guide 23 Using Markers with Dual Channel Time Measurements Compare the time trace of Channel 1 with Channel 2 using two techniques: peaktracking and coupled markers. With peak tracking active on both channels, it ispossible to measure an event with two channels...

AGILENT 35670A Supplemental Operator’s Guide 25 Section 11 : Modal Testing Using a Hammer and Accelerometer Hammer testing is often the easiest and quickest technique for measuring frequencyresponse functions used in modal analysis. Instructions for using a hammer with aforce transducer and an accel...

AGILENT 35670ASupplemental Operator’s Guide 26 • Toggle the [XDCR UNIT ON OFF] softkey (F4) until ON is highlighted. • Press the [XDCR UNIT LABEL] softkey (F7). • Select the [g] softkey (F2). Setting Up Input Range Use CH* AUTO UP ONLY as the autorange routine as follows: • Press the [Input] hardkey...

AGILENT 35670A Supplemental Operator’s Guide 27 • Press the [TRIGGER SETUP] softkey (F6) • Press the [ALL CHANNELS] softkey (F8) • Press the [CHANNEL * DELAY] softkey (F9) • Enter - .01 then press the [S] softkey (F1) Now to check that the trigger parameters are correct, • Press the yellow [Start] h...

AGILENT 35670ASupplemental Operator’s Guide 28 Window [FFT] Type: Force/Expo Width: 15 ms Decay: 30 ms Date: 10-02-96 Time: 09:02:00 PM -9.766ms 115.112ms X:488.281 us Y:-74.925 mV X:488.281 us Y:-53.234 mV -9.766ms 115.112ms X:488.281 us Y:48.1237 mV -9.766ms 115.112ms A: CH1 Time B: CH2 Time X:488...

AGILENT 35670A Supplemental Operator’s Guide 29 window time constant of 62.5 ms. To set up these Force/Response windows, followthese steps: • Press the [Window] hardkey. • Press the [FORCE EXPO] softkey (F4). • Press the [FORCE EXPO SETUP] softkey (F6). • Press the [FORCE WIDTH] softkey (F6). • Ente...

AGILENT 35670ASupplemental Operator’s Guide 30 significantly. Ten averages may take longer, but may be necessary when testingdifficult, non-linear structures. To set up five averages, follow these steps: • Press the [Avg] hardkey. • Toggle the [AVERAGE ON OFF] softkey (F1) until ON is highlighted . ...

AGILENT 35670A Supplemental Operator’s Guide 31 Changing Frequency Span Changing frequency span or resolution affects three important parameters in hammertesting which must be changed to correspond to the new time record length: TriggerDelay, Force Window Width, and Response Window Decay Time. The f...

AGILENT 35670ASupplemental Operator’s Guide 32 Section 12 : Hammer Test Setup Without a Force Transducer Hammer testing for modal analysis without a force transducer can yield usableresults if an accelerometer is placed on the hammer and used to trigger themeasurement. Although frequency response fu...

AGILENT 35670A Supplemental Operator’s Guide 33 Section 13 : Order Domain Results in List Mode Machinery run-ups and run-downs can be analyzed with order analysis, which isspectral analysis normalized to RPM. Results can be simplified by examining only alist of amplitude versus order, so that only d...

AGILENT 35670A Supplemental Operator’s Guide 35 Section 14 : Comparing Two-Channel Real-Time Spectra with Recalled Data Compare two channels of real-time data with spectra stored in registers using theUPPR/LOWR FRNT/BACK display format of the AGILENT 35670A. Note that thereal-time data should be mea...

AGILENT 35670A Supplemental Operator’s Guide 37 • Press the [Save/Recall] hardkey. • Press the [RECALL DATA] softkey (F4). • Press the [RCL TRACE AND SCALE] softkey (F1). • Press the [FROM FILE INTO D1] softkey (F1). • Press the [CLEAR ENTRY] softkey (F9). • Enter COMPARE1.DAT and press the [ ENTER]...

AGILENT 35670ASupplemental Operator’s Guide 38 Scaling for traces A and B are now identical. To accomplish the same trace scalingfor C and D, follow these steps: • Press the [Active Trace] hardkey. • Press the [C D] softkey (F1). • Press the [Scale] hardkey. • Toggle the [AUTOSCALE ON OFF] softkey (...

AGILENT 35670A Supplemental Operator’s Guide 39 Section 15 : Waterfall Spectra at Time Intervals Waterfalls on the AGILENT 35670A can be used to examine and compare spectra atfixed intervals of time. This is especially useful when measuring non-stationarysignals from machinery, such as during run-up...

AGILENT 35670ASupplemental Operator’s Guide 40 • Press the [Disp Format] hardkey. • Press the [WATERFALL SETUP] softkey (F8). • Toggle the [WATERFALL ON OFF] softkey (F1) until ON is highlighted. The default number of waterfall steps is 15, which means only 15 spectra are kept inmemory and as new da...

AGILENT 35670ASupplemental Operator’s Guide 42 Section 16 : Waterfall Spectra at RPM Intervals Spectra can be acquired at fixed RPM intervals with RPM STEP ARM. This featureallows spectra to be taken at uniform RPM intervals even during erratic run-ups. Setting Up the Tachometer Connect the tachomet...

AGILENT 35670A Supplemental Operator’s Guide 43 • Press 50 then the [RPM] softkey (F1) . Then specify the total number of spectra to be collected (15): • Press the [Active Trace] hardkey. • Select the [B] softkey (F2). • Press the [Disp Format] hardkey. • Select the [WATERFALL SETUP] softkey (F8). •...

AGILENT 35670ASupplemental Operator’s Guide 44 Marker Fcn [Watrfall] Trace: B Save Reg: D2 Base Supr: 0 % Height: 57 % Date: 07-24-96 Time: 11:31:00 PM Slice:122 Hz Trace:4.311 kRPM 0Hz 800Hz A: D2 Pwr Spec B: CH1 Pwr Spec 1 Vrms 100 u LogMag 4 decades 0Hz 800Hz 1 Vrms LogMag 100 uVrms 4.883 kRPM 3....

AGILENT 35670ASupplemental Operator’s Guide 46 • Toggle the [AUTOSCALE ON OFF] softkey (F1) until ON is highlighted. . • Press the [Active Trace] hardkey. • Press the [B] softkey (F1) • Press the [Meas Data] hardkey. • Press the [CHANNEL 1 2 3 4] softkey (F1) until 2 is highlighted. • Press the [TIM...

AGILENT 35670ASupplemental Operator’s Guide 48 • Toggle the [CHANNEL 1 2 3 4] softkey (F1) until 2 is highlighted. • Press the [ LIN SPEC CHANNEL 2 ] softkey (F3) . • Press the [ ENTER ] softkey (F7) . Set up display • Press the [Disp Format] hardkey. • Press the [QUAD] softkey (F6). After a instrum...

AGILENT 35670ASupplemental Operator’s Guide 50 Section 18 : Measuring Frequency Response with the AGILENT 35670A Frequency response functions characterize the behavior of systems to externalstimuli. For mechanical systems, the stimulus can be a transient force such as animpact from a hammer, or a br...

AGILENT 35670A Supplemental Operator’s Guide 51 • Attach one end of stinger to shaker and one end to force transducer • Connect amplifier output to shaker • Connect amplifier input to AGILENT 35670A source Connect the transducers • Connect force transducer to Channel 1 • Connect accelerometer to Cha...

AGILENT 35670ASupplemental Operator’s Guide 52 Choose measurement parameters • Press the [Freq] hardkey • Enter 800 and then press the [ Hz ] softkey (F2) • Press the [Avg] hardkey. • Press the [NUMBER AVERAGES] softkey (F2), enter 4, then press the [ENTER] softkey (F1). • Turn on averaging by press...

AGILENT 35670A Supplemental Operator’s Guide 53 • Turn up the level control on the shaker amplifier until the excitation is noticeable, but does not buzz or rattle. If buzzing or rattling is heard,then either the level is too high or the structure is loose and must bequieted. • Press the [MORE CHOIC...

AGILENT 35670ASupplemental Operator’s Guide 54 • Press the [Disp Format] hardkey. • Press the [SINGLE] softkey (F1) • Press the [Active Trace] hardkey. • Press the [ A ] softkey (F1). • Press the [Trace Coord] hardkey. • Press the [MORE CHOICES] softkey (F6). • Press the [NYQUIST DIAGRAM] softkey (F...

AGILENT 35670A Supplemental Operator’s Guide 55 • Toggle the [AUTOSCALE ON OFF] softkey (F1) until ON is highlighted. • Press the [Active Trace] hardkey. • Press the [ A ] softkey (F2). • Press the [Trace Coord] hardkey. • Press the [MORE CHOICES] softkey (F6). • Press the [REAL PART] softkey (F2). ...

AGILENT 35670ASupplemental Operator’s Guide 56 Section 19 : Two Spectral Traces Showing Mils and Ips while EU is G Measure an accelerometer signal and display velocity and displacement spectra withthe UPPER/LOWER display format in the AGILENT 35670A as follows: Preset the AGILENT 35670A • Turn on th...

AGILENT 35670A Supplemental Operator’s Guide 57 • Press the [Trace Coord] hardkey. • Press the [Y UNITS] softkey (F8) • Toggle the [AMPLITUDE PK PP RMS] softkey (F4) until PK is highlighted. • Press the [XDCR UNIT CONVERT] softkey (F4) • Press the [inch/s (VEL)] softkey (F6) • Press the [Scale] hard...

AGILENT 35670ASupplemental Operator’s Guide 58 Section 20 : Peak Hold During a Machine Run-up and Coast-Down Peak amplitudes experienced during run-ups and coast-downs can be measureddirectly with the AGILENT 35670A using peak hold. Although the resulting spectrawill indicate the maximum amplitude m...

AGILENT 35670ASupplemental Operator’s Guide 60 Section 21 : Using an External Trigger for Time Averaging Use external triggering for synchronous averaging of linear spectra. With a reliable,consistent trigger, the resulting noise floor tends to be eliminated and the signal-to-noise ratio of the meas...

AGILENT 35670A Supplemental Operator’s Guide 61 Acquire and Display the Trigger Signal • Press the yellow [Start] hardkey. • Press the [Freq] hardkey. • Press the [UP ARROW] hardkey until only a few trigger pulses are visible. • Press the yellow [Pause/Cont] hardkey to stop the measurement and chara...

AGILENT 35670A Supplemental Operator’s Guide 63 Section 22 : Saving Trace Data to a 3.5” Disk or Non-Volatile RAM Save trace data into non-volatile RAM or 3.5” disk using the AGILENT 35670ASave/Recall capabilities. All AGILENT 35670A data is stored as a Standard DataFormat (SDF) file. This data form...

AGILENT 35670ASupplemental Operator’s Guide 64 Saving Trace to Non-Volatile RAM (NV-RAM) To store Trace A data as a file named “N1.DAT” into NV-RAM, follow these steps: • Press the [Active Trace] hardkey. • Press the [ A ] softkey (F5). • Press the [Save/Recall] hardkey. • Press the [DEFAULT DISK] s...

AGILENT 35670A Supplemental Operator’s Guide 65 Section 23 : Recalling Trace Data From 3.5” Disk or Non-Volatile Memory Recall trace data from a file in non-volatile RAM or 3.5” disk using the AGILENT35670A Save/Recall capabilities. Recalled data is placed in a data register where itcan be viewed, p...

AGILENT 35670A Supplemental Operator’s Guide 67 Section 24 : Plotting and Printing Trace Data Use the plotting and printing capability of the AGILENT 35670A to generatehardcopy documentation of measurement results. Any trace can be documented,however to plot or print data stored on disk or in NV-RAM...

AGILENT 35670A Supplemental Operator’s Guide 69 Section 25 : Importing Plots into Microsoft Word The plotter output of the AGILENT 35670A conforms to the HP-GL/2 GraphicsLanguage. When the PLOT/PRINT output device is specified as a 3.5” disk file, nota printer or plotter, then the resulting graphics...

AGILENT 35670ASupplemental Operator’s Guide 70 Plot to a File Using the AGILENT 35670A The AGILENT 35670A has the ability to route plotter output to a file. If the file isnamed with a “.HGL” file extension, then Word will recognize this file immediatelyas an HP Graphics Language file. Set up plotter...

AGILENT 35670A Supplemental Operator’s Guide 71 Section 26 : Running a Single Calibration Test on Command The AGILENT 35670A automatically runs periodic self-calibration tests whichensure that all measurements will meet published performance specifications. If acalibration is desired at a specific t...

AGILENT 35670ASupplemental Operator’s Guide 72 Section 29 : Transducer Unit Conversion with the AGILENT 35670A Automatic conversion between acceleration, velocity, or displacement units isavailable with the Trace Coord capability in the AGILENT 35670A. Transducersensitivity and transducer unit label...

AGILENT 35670A Supplemental Operator’s Guide 73 • Press the [XDCR UNIT CONVERT] softkey (F4) • Press the [inch (DISP)] softkey (F7) • Press the [Scale] hardkey. • Toggle the [AUTOSCALE ON OFF] softkey (F1) until ON is highlighted. This accomplishes the equivalent of multiplying “g” by 386.4 to get “...

AGILENT 35670ASupplemental Operator’s Guide 74 • Press the [DEFINE CONSTANT] softkey (F2). • Press the [DEFINE K1] softkey (F1). • Enter 386.4 and press the [ENTER] softkey (F1). • Press the [Analys] hardkey. • Press the [DEFINE FUNCTION] softkey (F1). • Press the [DEFINE F1] softkey (F1). • Press t...

AGILENT 35670ASupplemental Operator’s Guide 76 above the track number. The following descriptions link the Section in this User’s Guide to the appropriateCD track. Also described herein is the recommended CD output channel connectionto the AGILENT 35670A. Finally any setup clues will be described to...