Manfred Weber
Metra Mess- und Frequenztechnik in Radebeul e.K.
Since 1954

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Signal Conditioners

Metra has been manufacturing amplifiers for piezoelectric transducers for over 50 years. We offer economic charge amplifiers and signal conditioners for IEPE transducers including microphones.
Charge and IEPE Conditioners M72A1 M72A3 M72S1 M72B1 M72B3 M72R1
  • For piezoelectric transducers with charge or IEPE output
  • Amplification, filtering and integration
  • M72R1 and M72S1 for 19" racks
  • Rack cases M72S8 and M72R8 with USB
  • Charge attenuators MQ20/MQ40 available as accessory for high inputs
Channels 1 3 1 1 3 1
Gain charge / IEPE 0,1 / 1 / 10 / 100 / 1000 mV/pC;  0 / 20 / 40 / 60 dB 0,1 / 1 / 10 / 100 / 1000 mV/pC;  0 / 20 / 40 / 60 dB
Integrators single and double single and double
Input of transducer sensitivity 4 digits; 0.001 to 9999 mV or pC/mech. unit by keys and LED display none none none
TEDS support IEEE 1451.4; templates 25 for force and acceleration and 27 for microphones
none none none
Low pass filters
0.1 / 1 / 10 / 50 kHz 0.1 / 1 / 10 / 50 kHz
High pass filters
0.1 / 3 Hz
0.1 / 3 Hz
Inputs / outputs
BNC sockets at rear of instrument
BNC sockets at rear of instrument
Level indication
in percent by LED display and overload LED
overload LED
USB interface
none none only with rack case
none none only with rack case
Power supply
7 to 30 V with mains plug adapter
from rack case
7 to 30 V with mains plug adapter from rack case
Data sheet Instruction manual Charge attenuators MQ20 / MQ40
Device driver for M72R8 and M72S8 rack cases
Setup tool for M72R8 and M72S8 rack cases
 
8 Channel IEPE Conditioner M208A M208B
  • For piezoelectric accelerometers, force and pressure sensors and microphones with IEPE output
  • Suitable as signal conditioner, meter and monitor (M208A)
  • Measurement of RMS and peak values (M208A)
  • Embedded web server for remote measurement and monitoring (M208A), Example of web page hosted by the M208A
  • Serial interface with PC software for setup and metering (M208A)
  • High pass, low pass and integrator plug-in modules
  • TEDS support (M208A)
  • Relay output (M208A)
  • Shared output
  • Compact 19" rack case with low depth
M208A - All-In-One:
  • Signal conditioner with filters and integrators
  • RMS/Peak vibration meter
  • Vibration monitor with relay output
  • Web server for remote measurement

Gain
0.1 .. 1000, incremental 1 / 10 / 100 / 1000
Frequency range 0.1 Hz .. 100 kHz 0.1 Hz .. 100 kHz
Readout display 4 digits; RMS or peak; 1 s multiplex; with mechanical unit -
TEDS support automatic transducer sensitivity normalization -
Ethernet embedded web server hosts HTML page for readout and setup, Example/td> -
RS-232 Interface master and slave interface for PC control of up to 8 units by supplied control software or ASCII command set -
Relay output 1 relay with adjustable threshold for each channel -
High pass filter modules FB3- 3 / 5 / 10 / 30 / 50 / 100 / 300 / 500 / 1000 Hz (Butterworth, 2nd order) FB3- 3 / 5 / 10 / 30 / 50 / 100 / 300 / 500 / 1000 Hz (Butterworth, 2nd order)
Low pass filter modules FB2- 0.1 / 1 / 3 / 5 / 10 / 30 / 50 / 100 kHz (Butterworth, 4th order) FB2- 0.1 / 1 / 3 / 5 / 10 / 30 / 50 / 100 kHz (Butterworth, 4th order)
Integrator modules single integrator 3 - 1000 Hz (FBV) and double integrator 5 - 200 Hz (FBD) single integrator 3 - 1000 Hz (FBV) and double integrator 5 - 200 Hz (FBD)
Connectors 8 BNC inputs; 8 BNC outputs; shared BNC output; Sub-D output 8 BNC inputs; 8 BNC outputs; shared BNC output
Power supply 10 - 28 VDC; mains plug adapter 115 / 230 VAC 10 - 28 VDC; mains plug adapter 115 / 230 VAC
Data sheet Instruction manual M208A Instruction manual M208B
M208A operating and measuring software for Windows PCs
Firmware update

IEPE Conditioning Modules NEW M29 NEW M33 M32
  • Power supply and signal conditioning for IEPE sensors
  • Compact and robust
  • Modular system: Two screwed-in plugs provide mechanical and power supply connection to neighboring modules
  • M32 with 3 gains
  • M33 with 4 gains
  • M32 with plug-in low pass filter
  • M33 with plug-in high pass / low pass filter or integrator
  • Sensor status LED shows 3 conditions
  • DIN rail adapter available

Gain 1 1 / 10 / 100 / 1000 1 / 10 / 100
Low pass filter - Steckmodul FB2; 0.1 .. 50 kHz; 4 poles Steckmodul FB2; 0.1 .. 30 kHz; 4 poles
High pass filter - Plug-in filterFB3; 3 .. 1000 Hz; 2 poles -
Integrator modules (replace high / low pass) - Plug-in integrator FBV (single) or FBD (double) -
Input / output socket BNC BNC BNC
Power supply 5 .. 28 VDC 5 .. 28 VDC 5 .. 26 VDC
Data sheet Instruction manual Data sheet Instruction manual Data sheet Instruction manual

Remote Charge Converter IEPE100
  • In-line charge amplifier for piezoelectric sensors with charge output
  • IEPE compatible output
  • For long distances between sensor and instrument
  • Suitable for standard instrumentation
  • Switchable gain ranges
Gain (selectable by DIP switches) 0.1 mV/pC
1 mV/pC
10 mV/pC
Frequency range 0.2 Hz .. 65 kHz (-3 dB)
Input / Output BNC female / male
Data sheet Instruction manual