ZET 412 Signal Amplifier

Signal Pre-amplifier with Pseudo-galvanic Separation

The Signal amplifier ZET 412 with pseudo-galvanic separation is intended for amplification of input signals from various primary transducers and their transmission to the measuring unit (e.g., ZET 210 ADC/DAC unit) as well as for power supply of the connected sensors.

Passive (resistive) sensors measuring relative deformations, torque and bending moments, forces, and other parameters, as well as active sensors built on integrated circuits which measure acceleration, magnetic and electric field, pressure and temperature, etc. can be connected to the amplifier.

From 203 USD

Features

of the ZET 412 Signal Amplifiers

Connection

of passive and active sensors

1, 10, 100, 1,000

Gain ratios

Power supply

from USB 2.0

SPECIFICATIONS

of the ZET 412 Signal Amplifiers

TECHNICAL SPECIFICATIONS
PRE-AMPLIFIER PATH
No of input channels 2 differential input channels
Frequency band up to 20 kHz
Gain ratio 1, 10, 100, 1,000
Input voltage range at the GR=1 ±10 V
Output voltage range, min. ±10 V
Input resistance 1 mOhm
Internal noise level at GR=1000   < 2,0 mkV
Output load capacity  < 10 mA
Voltage source short-circuit protection yes
Pseudo-galvanic separation yes
SENSOR POWER SUPPLY TRACK
No of channels 2 asymmetrical channels
Frequency band up to 20 kHz
Gain ratio 1
Input voltage range ±10 V
Output voltage range, min. ±10 V
Input resistance 100 kOhm
Internal noise level   < 3,0 mV
Nominal supply current for the passive (resistive) sensors (±5%) 3 mA (12 V)
Active sensor supply voltage (±5%) +5 V (< 10 mA)
ADDITIONAL CHARACTERISTICS
Connected sensors bridge sensors, half-bridge and quarter-bridge strain sensors
thermoresistors, thermocouples
piezoresistive transducers
potentiometric sensors
active sensors on integrated circuits
Insulation resistance 100 kOhm
Break-down voltage > 400 V
AC voltage attenuation ratio between the “grounds” at 20 kHz > 120 dB
Standby consumed power < 1.2 W
Socket/output type (the matching parts are included in the scope of supply) DB15M (input), DB9M (output)
Dimensions 35×91×111 mm
Power supply 5 V (USB interface, external power supply)
Weight < 150 g

FLOW DIAGRAM

of the ZET 412 Signal Amplifiers

Block diagra of the amplifier

The input signal (Uin+ and Uin- from the primary transducer (passive or active) is fed to the differential amplifier with switched gain ratio (GR=1, 10, 100, 1,000). From the amplifier output, the output signal passes through the pseudo-galvanic separation to the ADC inputs (e.g. to ZET 210 ADC/DAC unit inputs). From the generator (DAC) channels, the signal is transmitted through the pseudo-galvanic separation to the Signal amplifier ZET 412 sensors side.

Switch positions and relevant

GAIN RATIOS

The switch positions and their corresponding gain factors

The galvanically separated voltage sources (VS) and current sources (CS) are used for power supply to the active and passive primary transducers, respectively.

The passive sensors include the resistive transducers, such as thermocouple-based temperature sensors or resistive-strain-sensor-based strain sensors.

The active sensors include various transducers on integrated circuits, such as acceleration sensors (accelerometers) of ADXL type by Analog Devices, magnetic field sensors by Honeywell, or pressure and temperature sensors by Freescale.

PASSIVE SENSOR CONNECTION DIAGRAMS

Schematics for connecting passive sensors-to the amplifier

ACTIVE SENSOR CONNECTION DIAGRAMS

Scheme connecting active sensors to the amplifier

The galvanically separated voltage sources (VS) and current sources (CS) are used for power supply to the active and passive primary transducers, respectively.

The passive sensors include the resistive transducers, such as thermocouple-based temperature sensors or resistive-strain-sensor-based strain sensors.

The active sensors include various transducers on integrated circuits, such as acceleration sensors (accelerometers) of ADXL type by Analog Devices, magnetic field sensors by Honeywell, or pressure and temperature sensors by Freescale.

BASIC CONFIGURATION

of the ZET 412 Signal Amplifiers

Basic set of the signal amplifier

Basic configuration of Signal amplifier ZET 412:

  • A signal amplifier with pseudo-galvanic separation
  • USB 2.0 cable for connection to a PC and power supply.
  • Terminal blocks for sockets DB-9 and DB-15.
  • Passport. Operation manual.

From 203 USD

Signal amplifier ZET 412 is unique because it can be connected to almost all known types of physical to electric value primary transducers, each channel has insulated power supply and complete galvanic separation which prevents the inter-channel interference and channel mutual influence.

Signal amplifier ZET 412 power supply may be from a PC USB, a 220 V network adapter, or a standalone power supply unit, which makes the amplifier a versatile tool for deploying measuring systems using ADC/DAC units.

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