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What do we adjust with zero/span potentiometers?

Errors and signal distortion, which may arise from sensor errors and/or varying measurements by the measuring transducer, are easy to compensate using the potentiometers on the front of the isolation amplifier.

For example, the input signals may contain a slightly falsified measured value. Using the potentiometers to compensate the ZERO and SPAN measured distance, this kind of divergence in the percent range can be corrected, enabling the downstream devices, e.g. a PLC to obtain a correct measured value.

Can I also isolate ac voltage?

Yes, but it depends entirely on the critical frequency of the isolation amplifier. A.c. voltages below the critical frequency specified on the data sheet can be transmitted by potentially isolated means. With some device types the critical frequency can be changed over using a DIP switch.

What is meant by a universal power pack?

Our Universal power packs in the High Functionality series for 20 - 253 V AC/DC can be used worldwide in all power supply networks. The high degree of efficiency largely prevents the device from heating up. This is reflected in excellent reliability and long-term stability.

What does stating the burden data signify regarding amplifiers?

The burden specifies the degree to which the isolation amplifier may be loaded at the output without the measured value being falsified.

If there is one current output, the amplifier must provide output voltage, which - depending on the switched-on load - can make the current (measured value) flow. The maximum burden is calculated according to Ohm's law from the maximum output voltage at the current 20 mA output.
Example: the guaranteed maximum output voltage = 12 V is equivalent to a 600-Ohm burden.

With the voltage output it is exactly the same, only the output must be capable of delivering an appropriately high current so that the voltage (measured value) on the load can drop.
Example: guaranteed maximum output current = 20 mA, this means a permissible load of 2 kOhm.

Motor monitoring by means of a tachogenerator

A typical application for our universal isolation amplifier with bipolar input is motor monitoring with the aid of a tachogenerator.

The tachogenerator supplies output voltage proportionate to the drive speed. Depending on the direction of rotation, this voltage can be positive or negative, i.e. bipolar. This is how the actual value of the speed is determined, especially in the case of speed-controlled drives.

Use in customised mechnical engineering

A universal isolation amplifier is especially good to use in customised mechanical engineering with all its individual measuring functions. The many input and output ranges and the universal long-distance power pack make it possible to use just one type of device in numerous applications thanks to many possible signal combinations.

Our DK 8000 special signal isolation amplifier, which can process other unipolar and bipolar input and output signals is available in different versions for isolating and converting customer-specific special signals.

Do you have further questions?

Then ask us your question by email or call our hotline at +49 30 40 998-222.