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Modular System for the Study of Sensors


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Unit to control the system. Common for the different test modules type “BS”. Elements of the unit are included in a stainless steel box. In the back part of the box, we can find the outlet and the general switch of the equipment for its operation. In the front part there are two masks with all type of signal conditioners, and even an analogical voltmeter. Sensor connections with the Base Unit and with power supplies is through 2mm.
terminals located in the front panel of each test module. The test modules may operate independently one of another. SCADA. EDIBON Computer Control System, formed by: Control interface is integrated into the unit box (BSPC). Data acquisition board to be installed in a computer slot. Computer Control Software.

Base Unit:
Unit to control the system. Common for the different test modules. All elements are included in a stainless steel box. In the back panel of the box, we can find outlet and the general switch of the unit for its operation. In the front panel there masks with all type of signal conditioners, and even an analogical voltmeter.


  • Several amplifier circuits of DC are included in the Base Unit, but only three are used specifically for the amplifiers applications: Amplifier 1 that holds a changeable gain from 0.1 to 100 approximately. Amplifier 2 that is identical to the amplifier 1. Amplifier 3: x100 amplifier that holds a fix gain of 100 approximately and lacks an offset control.
  • AC amplifier. It holds three fix gains: 10, 100 and 1000.
  • Power amplifier. It holds gain unit and a maximum current output about 1.5A.
  • Current amplifier. It is used for working with the photodiode, giving an output voltage of 10000 times bigger than the input current. That is to say, a maximum of 10V for a 1mA input current.
  • Two buffer amplifiers. They holds an output current around 20mA maximum.
  • Inverter amplifier. It inverts the polarity of the voltage applied at the input. Voltage gain=-1.
  • Two circuits of differential amplifiers are supplied. We called the second one "Instrumentation Amplifier". This one makes the same basic operations as the differential amplifier, but holds an improved gain in common mode and shows the same impedance in each input.

Signal Converters Circuits:

  • Converter from Voltage to Current. It is used to convert the input voltage into a current at the output.
  • Converter from Current to Voltage. It transforms an input current into an output voltage.
  • Converter from Voltage to Frequency. It converts an input voltage in an output frequency.
  • Converter of Frequency to Voltage (F/V). It converts an input frequency signal to an output voltage.
  • Full-Wave Rectifier. It converts an input signal, whatever it polarity may be, to a DC signal with positive polarity. The circuit allows the voltage measurement in AC using instruments for DC.
  • Phase rectifier. This circuit rectifies an input signal depending on the rectification angle that has been taken when a comparison of two outphased signals has been made.
  • Phase shifter. This circuit has a taken to connect an alternating current signal and to change the phase of the output according to the input. It is used in the balance of sensible systems of the phase.
  • Semiconductor detector of temperature.

Comparators, Generators, Oscillators and Filters:

  • Comparator. The output voltage has two possible states from 0 V. to +12V.
  • Alarm oscillator. It consists basically on two stages: an input circuit that it is a comparator and an oscillator.
  • Electronic switch. Basically, it consists on a comparator that controls a power transistor that works as a static switch.
  • Oscillator. It makes a sinusoidal output with a frequency approximated of 40KHz to be used with any of the AC transducers supplied.
  • Filters. There are basically two types of filters, depending on the pass frequency: Bandpass filter. Low-pass filter.
  • Integrator.
  • The differentiator.
  • Circuit “Sample and Hold”. It allows picking up the input signal value in a certain moment and save it for a later treatment.
  • Pulse generator. With it, we shall obtain adequate pulses to give energy to the coils of some meters. Its maximum voltage AC of synchronisation is 20V. Pulse Receiver. This circuit is designed to amplify microvolts signals, generated by the circulation of a flow through an electromagnetic flux meter.
  • PID Control. This circuit is used to process error signals in a closed loop. It includes potentiometers to set the proportional, integral and derivative constants to the different systems to be controlled.
  • Power Control. This circuit allows the control of the heating time for a resistor (for example, the one in an oven).
  • Low Frequency Oscillator. This circuit makes possible to have a sinusoidal signal with a variable frequency and amplitude. The frequency can vary from 4.7 to 47 Hz.
  • Current generator. This circuit generates a constant current of about some 397 mA. It has been built only for small resistances, between 1Ω and 10Ω as a maximum.


  • Supply Sources of Direct Current (1A). There are +/-5V and +/-12V voltages sources of low power (1 A maximum) and some ground taken.
  • Power source (4A). It has a variable output of direct current: 0 and 15V and other output of alternate current, variable: 0 and 24V.
  • 4 Potentiometers of: 1KΩ, 5KΩ, 10KΩ and 20KΩ, to use them on assemblies, whenever necessary.

SCADA. EDIBON Computer Control System:

  • Control Interface integrated in the unit box (BSPC).
  • Data acquisition board to be installed in a computer slot.
  • Computer Control Software.

Cables and Accessories, for normal operation.
Manuals: It is supplied with 8 manuals: Required Services, Assembly and Installation, Interface and Control Software, Starting-up, Safety, Maintenance, Calibration & Practices Manuals.