Sine on Random

Run mixed-mode tests with sine tones superimposed on a random background.


Part number 9206


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 1000 separate frequency/amplitude breakpoints can be entered, allowing entry of virtually any test.

Sine ‘Tones’

1 to 32 true floating-point precision sine tones can be superimposed on the background random spectrum, and swept back-and-forth between frequencies at a user-programmable rate. The amplitude 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.

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 limits.


The controller comes standard with 50 to 1600 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 multi-channel notching for the random signal.

Test & 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.

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.

Complete RMS Sine on Random Calculator (Excel)



Provides engineers the ability to sweep multiple sine tones at different levels across a desired frequency range with no random background. Includes up to 32 true floating point precision sine tones, programmable amplitude and frequency sweep rates, and up to 50 separate frequency/amplitude breakpoints. Also known as Multi-Sine.

Reference Output (Optional) VR9104

The second output channel supplies a synchronization signal of the first sine tone.

Data plots

Many graphical display options are available, including acceleration spectral density, output voltage spectral density and 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.

Random Import (Optional) VR9204

Import analog or digital time data to automatically generate a profile. Imports PSD data, too.


STAG logoSine Tracking Analysis and Generation

Create your own SoR tests using STAG. Sine Tracking Analysis and Generation (STAG) generates Sine on Random tests reflective of environments with dominant rotational tones that are rendered as sine tones on a shaker table. STAG is a real-world evaluation for products that may experience these dominant sinusoidal components, such as engine components.

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