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Agilent 35670A Operator’s Guide
Different types of measurement.
• Rotating Machinery
• Structures(FRF)
• Sound/Acoustics
• Spectra and Networks
• Control Systems
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• HP 35670A (Front Panel)
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Spectrum Analyzer
• Initialize the analyzer- [Preset]
• [Inst Mode]-FFT Analysis, channels
• [Meas Data] [Active Trace]- selecting which type of data you
want to display ,PWR SPEC,LIN SPEC,TIME CHANNEL(1),
• [Freq] –span measurements, resolution, record length
• [Input] – Measurement parameters affect the way the analyzer
takes input data,
RANGE,FRONT END CH1 SET UP, XDCR UNIT CH1 SET UP
grounded/floating input
coupling ac/dc
anti-alias filter on/off
autoranging on/off
A-weight filter on/off
ICP power supply on/off
Sensitivity on/off
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• [Window]- Selecting a windowing function, HANN, FLAT TOP,
UNIFORM,FORCE EXPO, FORCE EXPO SETUP
• [Trigger]- Selecting a triggering function, Free Run Trigger,
External Trigger, Channel Trigger, Source Trigger, GPIB Trigger
• [Avg]- average on/off, number averages, average type,fast avg
on/off, update rate, repeat on/off, overlap %, overload rej on/off,
average preview off/manual/time
• [Source]-source on/off, level, dc offset,
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• [Trace Coord]-Linear Magnitude, Log Magnitude, db Magnitude,
phase, wrapped phase, x units,Y units
• [Analysis]- define function, define constant, data edit, curve fit,
synthsis
• [Scale]- autoscale on/off, match Y scale, axes scale markers
• [Disp Format]- single, upper/lower, front/back, upper/big lower,
quad, measurement state, waterfall setup
• [Marker]- marker on/off, coupled on/off, peak trk on/off
• [Marker Fctn]- harmonic marker, band marker, sideband marker ,
freq & damping
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Measuring Rotating Machinery
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Initialize the analyzer.
Press [Preset] [DO PRESET].
Press [Inst Mode] [FFT ANALYSIS].
Press [CHANNELS 1 2] (or [CHANNELS 1 2 4]) Press [Meas Data], then
press [CHANNEL 1 2] (or [CHANNEL 1 2 3 4]) to highlight the channel
whose transducer you will calibrate.
• Press [PWR SPEC CHANNEL x].
2. Match the active trace’s display unit to the calibrator’s output unit.
• Press [Input], then press [CHANNEL 1 2] (or [CHANNEL 1 2 3 4]) to
highlight the channel whose transducer you will calibrate.
• Press [XDCR UNIT CHx SETUP] [XDCR UNIT LABEL], then press the
softkey corresponding to your calibrator’s output unit.
• Press [Input] [XDCR UNIT CHx SETUP], then press [XDCR UNIT ON OFF]
to highlight ON.
• Press [Trace Coord] [Y UNITS] [EU].
• Press [AMPLITUDE PK PP RMS].
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3. Connect the transducer’s output cable to the analyzer as described at the
beginning of this chapter, then secure the transducer to the calibrator.
4. Specify the measurement parameters.
• Press [Freq] [SPAN], then press the down-arrow key if you want to reduce
the frequency span.
• Press [Window] [FLAT TOP] to maximize amplitude accuracy.
5. Press [Scale], then press [AUTOSCALE ON OFF] to highlight ON.
6. Turn on the calibrator, then press [Start].
7. After the display has been updated at least once, move the marker to the
calibrator’s output frequency and enter calibrator’s output amplitude.
8. Press [Marker] [MARKER TO PEAK].
• Press [Input] [XDCR UNIT CHx SETUP] [CAL VALUE AT MARKER], then
type the calibrator’s specified output amplitude and press [ENTER].
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Measuring Structures(FRF)
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Initialize the analyzer.
Press [Preset] [DO PRESET].
Press [Active Trace] [A B].
Press [Meas Data] [FREQ RESP 2/1].
Connect the device-under-test (DUT) as shown in the illustration below.
Specify the measurement parameters.
Press [Freq] [START] <number> <unit>, then press [STOP] <number> <unit>.
Press [Input].
Press [CHANNEL 1 2 3 4] to highlight 1.
Press [CHANNEL 1 RANGE] <number> <unit>.
Press [CHANNEL 1 2 3 4] to highlight 2.
Press [CHANNEL 2 RANGE] <number> <unit>.
Press [Window] [FORCE EXPO].
Press [FORC EXPO SETUP].
Press [CHANNEL 1 FORC EXPO] to highlight FORC.
Press [FORCE WIDTH] <number> <unit>.
Press [CHANNEL 2 FORC EXPO] to highlight EXPO.
Press [EXPO DECAY] <number> <unit>.
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4. Specify the triggering and averaging parameters.
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Press [Trigger] [CHANNEL 1 2 3 4] to highlight 1.
Press [TRIGGER SETUP] [CHANNEL LEVEL] <number> [PERCENT %]
Press [CHANNEL 1 DELAY] [+/-] <number> <unit>.
Press [CHANNEL 1 2 3 4] to highlight 2.
Press [CHANNEL 2 DELAY] [+/-] <number> <unit>.
Press [Avg], then press [AVERAGE ON OFF] to highlight ON.
Configure the display.
Press [Trace Coord] [X-AXIS LIN LOG] to highlight LIN.
Press [Active Trace] [B].
Press [Trace Coord] [PHASE].
Press [Active Trace] [A B].
Press [Scale], then press[AUTOSCALE ON OFF] to highlight ON.
Measure the DUT.
Press [Start].
Slowly tap the device 10 times with the impact hammer at or near the
accelerometer.
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