Random Import

Random vibration testing provides a more closely matched vibration to your end-use environment. With our Random vibration test module you get the highest possible control with ease of use. Here’s what’s included:



Part number 9204


Easy test entry

Frequency/amplitude breakpoints 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.


The controller comes standard with user-selectable 50 to 26,000 lines of control to provide you with the frequency resolution required for your test. You can analyze up to 50,000 Hz with the VR9203 High Frequency option, without sacrificing resolution.

Lines & Noise Floor


Frequency Range

The standard frequency range is DC-4,900Hz. The frequency range can be extended up to 50,000Hz with the VR9203 High Frequency option (note*- this option requires an export license for end users outside USA).

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.

Multiple shakers

From 1 to 4 control loops can be run simultaneously to independently control up to 4 shakers with 4 individually configurable and statistically independent waveforms.

Multi-Shaker Control

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. Levels can be changed while the test is running

Multi-channel extremal

Allows more than one input channel for control in a control strategy where the highest accelerometer reading will be used for control of the test.

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.

Independent channel notching profiles

Assign maximum limiting breakpoint profiles to individual channels. The drive output will be limited (or ‘notched’) if necessary to keep the input spectrum for that channel below the defined profile. Up to 1024 breakpoints can be entered for each channel, or the limit can be entered simply as a dB level relative to the demand profile. In addition, minimum limits may be defined to boost the drive output if a channel is below a defined profile. The notching profiles may also be used as spectrum abort limits, so that abort limit breakpoint profiles can be assigned to each individual channel, and if that channel reaches the defined limit the test will safely shut down.

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 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. Import PSD data, too.

Fatigue Damage Spectrum (Optional) VR9209

Measure your product’s fatigue and calculate its lifespan. For years people have used methods to calculate the lifespan of a product based on the material s/n curve. With FDS, rain flow analysis techniques from your product are applied to the actual measured vibration, equivalent fatigue is quantified and time to failure is calculated. Commonly used life acceleration techniques are applied to shorten test time.

Fatigue Damage Spectrum

Dual Phased Output (Optional) VR92-RDP

Dual axis with phase control. The drive output and the aux (COLA) output are both used to drive different shakers. The same profile drives both shakers. Matched phase between the two outputs, auto controlled.

Dual Axis

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