IsoAmp® 3000/4000

Universal isolation amplifier for input signals ±20 mV to ±10 V or 20 mA

The DC isolation amplifiers from the IsoAmp® 3000 / 4000 series transmit and convert impressed 0(4) ... 20 mA or 0 ... 10 V standard signals with a high level of accuracy (German patent DBP 34 12 843).
They provide protective separation and high insulation from input to output to power supply.


The Advantages
The control range extends into the negative values and allows strict linear transmission in the zero range. Compared with conventional unipolar amplifiers, this has a great advantage: The often asymptotic setting of the zero point, for example, when calibrating with a sensor, is ruled out.
The transmission accuracy is unusually high. The reason for this is mainly a negative feedback circuit that is incorporated in the electrical isolation. It has no measuring resistor for 1 : 1 transmission and just one measuring resistor for current / voltage conversion. Differentiated signal return allows the circuit to remain stable even with strong complex loads.
The components required in conventional concepts for matching amplifiers and resistor networks are omitted. The reliability is accordingly high.
The computer-controlled production monitoring and final check ensure high and constant quality. The full encapsulation guarantees maximum safety and reliability even in extreme conditions.


The Applications
The devices can be used for many galvanic isolation applications, for example:
• In measuring and control engineering across the world
• For linking measured signals to different potentials
• For removal of double-ground compensation currents
• For isolation of dangerous touch voltages
• For computer interfacing
• For increasing the load voltage and decoupled signal transmission
The DC isolation amplifier is available as a module for universal 24 V AC/DC power supply for use on printed circuit boards.
For protective separation according to EN 61140, the required clearance and creepage distance should be taken into consideration.


The 3000/4000 Mg and 3000/4000 Mh isolation amplifiers and the EK 9 eurocards are not designed for end users, but solely intended for installation as a part of another device in an industrial manufacturing process. The products are not subject to the EMC law. The requirements according to the EMC law have to be considered by the system designer or integrator.



The Models


IsoAmp® 3820
transforms the input current 1 : 1 into an impressed output current without negative-feedback resistors by means of negative-feedback current transformation.


IsoAmp® 4820
converts the input current 2 : 1 into an impressed output voltage with just one precision resistor after current transformation.


IsoAmp® 3310
converts the input voltage 3 : 1 into an impressed output current with just one precision resistor after voltage transformation.


IsoAmp® 4310
converts the input voltage 1 : 1 into an impressed output voltage without negative-feedback resistors after voltage transformation.