Random on Random

Run controlled spectrum random tests with swept random “tones” superimposed on a random background.


Part number 9207


Easy test entry

Frequency/amplitude breakpoints of the background random acceleration spectrum are entered in an easy to read tabular form using either frequency and amplitude breakpoints, or by entering one endpoint and the desired dB/octave slope. Over 9999 separate frequency/amplitude breakpoints can be entered, allowing entry of virtually any test.

Random ‘Tones’

1 to 32 narrow spectral bands can be superimposed on the background random spectrum, and swept back-and-forth between frequencies at a user-programmable rate. The amplitude, bandwidth and frequency sweep parameters are all user programmable. Up to 200 separate frequency/amplitude breakpoints can be entered, allowing entry of virtually any test spec.


The controller comes standard with user-selectable 50 to 13,000 lines of control to provide you with the frequency resolution required for your test.

Lines & Noise Floor

Control Channels

The control signal can be a single input channel, or configured from 2 to 128 input channels with either multi-channel averaging or optional multi-channel notching.

Configurable safety limits

To protect your test article and shaker system, configurable acceleration limits, line limits and drive limits can be set by the user. The control input is also verified against shaker acceleration and displacement limits.

Data Storage

All of the test data can be stored to the disk for later retrieval. Data storage can be done manually, or programmed to automatically save at user-defined intervals.

Data plots

Many graphical display options are available, including acceleration spectral density, output voltage spectral density, channel-to-channel transmissibility. Graphs can be easily auto-scaled or zoomed, and cursors displayed. Data and text annotations can be easily placed on the graphs, with data values updated live as the data changes.

Test and Level scheduling

Tests can be scheduled to run a user-defined length of time, the spectrum level can be scaled by a specified dB-level, percentage, or scaled for a specified RMS acceleration. Level schedules can be entered to run various durations at different acceleration levels.

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