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
NEW: M72A1
NEW: M72A3
NEW: M72S1
NEW: M72B1
NEW: M72B3
NEW: 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 (250 kB)
Instruction manual (250 kB)
Charge attenuators MQ20 / MQ40 (100 kB)
Device driver for M72R8 and M72S8 rack cases
Setup tool for M72R8 and M72S8 rack cases
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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
-
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 (400 kB)
Instruction manual M208A (1,5 MB)
Instruction manual M208B (500 kB)

M208A operating and measuring software for Windows PCs
Firmware update
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IEPE Conditioning Modules
M28
M32
  • Constant current supply for IEPE transducers
  • One channel each
  • Very compact and robust cases
  • Modular system: Two screwed-in plugs provide mechanical and power supply connection to neighboring modules
  • M32 with 3 gain ranges and plug-in low pass filter
  • Sensor status LED shows 3 conditions
  • DIN rail adapter available

Gain 1
1 / 10 / 100
Low pass filter modules
-
Plug-in module FB2; 0.1 .. 30 kHz; 4 poles
Input / output
BNC
BNC
Power supply
5 .. 26 VDC
5 .. 26 VDC
Data sheet (300 kB)
Instruction manual (100 kB)
Data sheet (300 kB)
Instruction manual (100 kB)
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Remote Charge Converter
IEPE100
  • Preamplifier for pezoelectric 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 (200 kB)
Instruction manual (500 kB)
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