Section 4 — Measurement Types and their Uses
72
2 — Setup
Before you can use your instrument to take a Cross Channel Spectrum
(ODS) recording, you will need to specify the appropriate settings for your
channels and sensors. You will need at least two sensors enabled for this
type of recording. The lowest channel (e.g. CH1) will be used as the
reference channel.
To set up your channels and sensors:
1. Press or Measure.
2. Use the navigation arrows to select Cross Channel Spectrum (ODS)
> Press .
3. Select your preferred FRF unit — Accelerance / Mobility /
Compliance:
a. Press Store Units.
b. Use the navigation arrows to select your preferred unit > Press
.
NOTE: This selection is the modal equivalent of choosing between
acceleration, velocity, and displacement. Consequently,
Accelerance is the better choice for very high frequencies, while
compliance is the better option for very low frequencies.
Frequency Response Function (FRF) units are derived automatically
based on your unit selection.
4. Specify your preferred spectral lines and samples:
a. Press Spectrum Waveform.
b. Use the navigation arrows to select the required option > Press
.
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