OFV-5000 Modular Vibrometer Controller - Decoders

By selecting from a choice of different analog and/or digital decoders, performance of the OFV-5000 Vibrometer Controller can be precisely tailored to match the demands of the application. Up to four decoders can be installed simultaneously to obtain the greatest possible flexibility. This flexibility also allows subsequent add-ons and modifications to meet future needs.

Decoder Selection

The OFV-5000 controller is designed to accept a choice of signal processing modules, each optimized for different frequency, velocity or displacement performance. Various analog and/or digital decoder options seamlessly cover the entire velocity range up to ± 10 m/s, displacements from picometers to meters, and frequencies from DC to 24 MHz. For vibration velocities up to 20 m/s Polytec provides the OFV Modulare 20 m/s Vibrometer.

The following tables list the basic features of the velocity and displacement decoders available for the OFV-5000 Controller. For more information please see separate data sheets for the respective decoders and the OFV-5000 vibrometer controller.

Available Velocity Decoders
Decoder	Description	No. of ranges	Best resolution	Max. velocity	Upper freq. limit
VD-02	Wide-bandwidth velocity decoder	4	0.15 µm/s	10 m/s	1.5 MHz
VD-04	Mid-frequency velocity decoder prerequisite to DD-400	3	0.2 µm/s	10 m/s	250 kHz
VD-05	10 MHz velocity decoder for ultrasonics	2	< 3 µm/s	5 m/s	10 MHz
VD-06	Digital high-precision velocity decoder	4	0.02 µm/s	0.5 m/s	350 kHz
VD-09	Broadband digital velocity decoder	14	0.02 µm/s	10 m/s	2.5 MHz

Available Displacement Decoders
Decoder	Description	No. of ranges	Best resolution	Full scale output	Freqency  range
DD-100	Basic displacement decoder Requires any velocity decoder	8	80 nm	±82 mm	0 Hz - 250 kHz
DD-200	High-resolution displacement decoder Requires any velocity decoder	13	2 nm	±82 mm	0 Hz - 250 kHz
DD-300	20 MHz displacement decoder for ultrasonics Requires any velocity decoder	1	0.1 pm	±75 nm	30 kHz - 24 MHz
DD-400	Integrating displacement decoder Requires VD-04	3	frequency dependent	±1 nm	20 Hz - 250 kHz
DD-500	Digital high-end displacement decoder Requires VD-06	16	15 pm	±50 mm	0 Hz - 350 kHz
DD-900	Broadband digital displacement decoder Requires VD-09 velocity decoder	16	15 pm	±50 mm	0 Hz - 2.5 MHz
DD-600	I&Q converter for data processing with VibSoft VDD

Decoder Combination

The OFV-5000 controller has four internal slots to accept up to four different signal decoders, depending on the desired measurement ranges. Two are specifically designated for velocity decoders and one is for the displacement decoder. An Auxiliary Slot is provided that can take either an optional velocity or displacement decoder.

The following table contains recommended decoder combinations for representative applications. More combinations adding further decoders are possible. If you have specific requirements, please contact Polytec’s application and sales engineers who will help you select the appropriate decoders and VibSoft software.

Recommended Decoder Combinations
VD-02	DD-200	Measurement of velocity and displacement up to 1.5 MHz and 10 m/s velocity. General applications, e.g. acoustics, mechanical and automotive engineering
VD-06	DD-500	Digital, high-precision measurement of velocity and displacement at frequencies up to 350 kHz with velocity range limited to 0.5 ms-1. Demanding applications e.g. acoustics, micro systems, precision mechanics
VD-02 VD-06	DD-500	Same as VD-06+DD-500, but vibration frequency range extended up to 1.5 MHz and velocity range extended up to 10 m/s
VD-02 VD-05		Measurement of velocity at high frequencies up to 10 MHz. High-frequency applications, e.g. ultrasonics, micro systems
VD-02	DD-300	Acquisition of vibrations at frequencies up to 24 MHz. High-frequency applications, e.g. ultrasonics, micro systems
VD-04	DD-400	Special solution for measurement of small displacements at very high velocities. Applications: monofrequent ultrasonic tools and processing, e.g. wirebonding, ultrasonic welding
VD-09		Acquisition of vibrations at frequencies from DC up to 2.5 MHz at high resolution and velocity. Application: ultrasonics and microstructures
VD-09	DD-900	Additional direct displacement output with picometer resolution. Suitable for measurements signals with DC components like switches or transient behaviour