Signal Amplifier / filtering electronics unit with
+/-4 Volt DC output



The NV4a is used for excitation, for filtering and for standardisation of the different of SEIKA sensors output signals.
The symmetrical output signal permits a problem-free signal transfer to measurement equipment as an oscilloscope AD-cards in PC’s or to other OEM equipment.

Even with large changes in the unit power supply, the NV4a will act very stable both for offsetting the sensors zero point and for supplying an stable +/-4 VDC output that is linear with the sensors working range.

The NV4a is used everywhere where a SEIKA sensor should be combined with a user-specific demand for high voltage output / special wishes for filtering of the sensor signal, plus where a non-stabilized 8...30VDC supply can be an advantage for the system.

For 0..5VDC output, please have a look at NV8a

For 4..20mA output, the NV6a is the correct solution.

Technical Data

 Dimensions Please se drawing
Supply voltage +8...+30Volt (protected against polarity reversal to -70Volt)
Current consumption without Sensor approx.2mA
Working temperature 0...70C
Sensor supply +5,00 Volt
Sensor supply-temp. drift 20ppm /C
Max. Output voltage 4 Volt


Active measuring range equal to sensor range 3,5 Volt
Off-set range 2,4 ...2,6 Volt (larger for e.g. B1 in Z-direction)
Output impedance app.100 W
Noise value on power supply 30Vs.s.
Signal audio-frequency noise at standard sensor app.80dB
Frequency range 0...10Hz, 0...200Hz, 0...2kHz + others as custom wishes
Electrical connections Pin connector 2,54mm, length 5,7mm, 0,63mm gold plated
optional soldering pads



Caution ! Do not short-circuit the operating voltage (8 to 30V) with the outputs

The negative operating voltage of the symmetrical VDC output is generated from the positive one.

print out .pdf brochure on NV4a

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Last modified: januar 29, 2024