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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 frequency
response functions used in modal analysis. Instructions for using a hammer with a
force transducer and an accelerometer to measure frequency response functions are
presented.
Setting Up the Transducer Parameters
Connect the force transducer on the hammer to Channel 1. Mount the response
accelerometer to the desired location on the structure, and connect it (or its
preamplifier) to Channel 2. Preset the analyzer and set up transducer parameters as
follows, assuming an ICP accelerometer with a sensitivity of 11 mV/g and an ICP
force transducer on the hammer with a sensitivity of 5 mV/lb:
• Press the green [Preset] hardkey
• Press [DO PRESET] softkey (F1).
Wait for the analyzer to finish its preset routine.
• Press the [Pause/Cont] hardkey to pause the current measurement.
Set up the force transducer parameters as follows:
• Press the [Input] hardkey
• Press [CHANNEL 1 234] softkey (F1) until 1 is highlighted.
• Press [FRONT END CH1 SETUP] softkey (F7).
• Press [ICP SUPLY ON OFF] softkey (F8) until ON is highlighted.
• Press the [Input] hardkey.
• Press the [XDCR SENSITVTY] softkey (F6).
• Enter 5, then press the [mV/EU] softkey (F2).
• Toggle the [XDCR UNIT ON OFF] softkey (F4) until ON is highlighted.
• Press the [XDCR UNIT LABEL] softkey (F7).
• Press the [MORE CHOICES] softkey (F9).
• Select the [lb] softkey (F6).
• [XDCR UNIT CH1 SETUP] softkey (F8)
Set up the accelerometer parameters as follows:
• Press the [Input] hardkey.
• Press [CHANNEL 1 2 34] softkey (F1) until 2 is highlighted.
• Press [FRONT END CH2 SETUP] softkey (F7).
• Press [ICP SUPLY ON OFF] softkey (F8) until ON is highlighted.
• Press the [Input] hardkey.
• Press [XDCR UNIT CH2 SETUP] softkey (F8)
• Press the [XDCR SENSITVTY] softkey (F6).
• Enter 11, then press the [mV/EU] softkey (F2).