Vibration control system

State-of-the-art vibration control system for electro-dynamic shakers. The system is distinguished by simplicity, reliability and high safety standard. The controller has a modular scalable architecture, which allows the user to get from 1 to 32 input channels.

The configuration of RL-C21 system is flexible: it is determined by the user and can be modified at any time.

The most innovative techniques of digital signal processing are embedded in the system. All calculations and safety checks are run by a DSP directly in the controller. This feature provides the highest level of shaker protection.

The system enables running multishaker tests and successfully controls two- and three-axes shakers, as well as vibration shakers with up to 6 degrees of freedom.

The presence of a galvanic isolation in the input chains allows effectively protecting input chains from breaks.

RL-C21 is used with a specialized vibration test software package VisProbe SL.


VisProbe SL

VisProbe SL

VisProbe SL v36 (x86)
See all versions



  • Analog channels
  • Sensor type
    IEPE, TEDS, charge, displacement, velocity, force sensors
  • Filtration
    Analog, digital high-pass and low-pass filters
  • Voltage range
    ±10 V
  • Dynamic range
    ≥ 120 dB
  • Noise level
    < 20 mV
  • Channels crosstalk
    ≤ -100 dB


  • Analog channels
    1 ÷ 8 control channels, Up to 8 COLA channels
  • DAC resolution
    24 bits
  • Relative frequency error
    ≤ 5×10⁻⁵
  • Filtration
    Analog filters, digital high-pass and low-pass filters
  • Dynamic range
    120 dB


  • Frequency range
    1÷4999 Hz
  • Temperature range
    +5 ÷ +50 °C
  • Dimensions
    390×274×54 mm
  • Weight
    2.3 kg
  • Power supply
    110÷245 V

Electromagnetic Compatibility Directive 2014/30/EU

Low Voltage Directive 2014/35/EU

Program interface

Frequently Asked Questions (FAQ)

VisProbe SL does not see the device. There is a message saying that the device has not been found.

Are the settings of channels and shakers, which I specify, saved?

See more FAQ

Product information

RL-C21 and RL-C25. Sine test profile.

RL-C21 and RL-C25. Random test profile.

RL-C21 and RL-C25. Shock test profile.


Software Update for RL-C21 and RL-C25 Controller

How to mount accelerometers

To provide high accuracy of vibration measurement, the usable frequency and dynamic range must not be limited as a result of incorrect mounting of accelerometers. One of the basic requirements for correct sensor mounting is close mechanical contact between the accelerometer’s base and the mounting surface. To achieve it, you can use a wide range of various special applications for mounting. However, it is not that simple.

Mounting Stud

Mounting the accelerometer with the help of a steel stud is the best mounting method because this way enables achieving the highest resonance frequency. It is recommended to always use this method of mounting when possible.

Wax mounting

To fix the accelerometer quickly (for example, when you monitor the vibrations in different points by moving the accelerometer) you can use beeswax for easy mounting and demounting. This method has a temperature limit of 40°C because beeswax melts. Besides, wax will have to be removed with alcohol, which might be inconvenient.

Magnetic Mounting

This convenient method of mounting uses a constant magnet, which can be easily moved from one place to another. It is especially handy, when you need to gather data in many points of measurement in the minimum possible test time. This method can only be used on clean flat ferro-magnetic surfaces and its dynamic range is limited by the power of the magnet. However, this method can provide good high-frequency characteristic, especially on flat surfaces. Applying a magnet base onto the magnet provides eclectic isolation between the accelerometer and the mounting surface.

Electrical Isolation Bases

In places, where eclectic isolation of the object from the accelerometer is desirable, you can use isolation bases. This may be necessary if the electric potential of the object under test is different from the ground potential of the measuring instruments, or if mounting a stud itself creates a “ground loop”, which can affect measurement results. The latter reason is the most common cause of choosing mounting with an electric isolation base. There are also special isolating mounting bases made of ceramics and metal integrated together, which may be used when working in high temperatures.

See more education materials
VisProbe SL

VisProbe SL

Other equipment