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

Signal Conditioners

Metra has been manufacturing amplifiers for piezoelectric transducers for over 40 years. We offer economic charge amplifiers and signal conditioners for IEPE transducers including microphones.

Charge and IEPE Conditioner	M68R1	M68D3	M68D1
For piezoelectric transducers with charge or IEPE output 5 gain ranges 6 low pass filters, high pass Single and double integration M68D1 with battery inside M68D3 with 3 channels M68R1 for 19" rack mounting Rack cases for 6 or 12 M68R1 available Charge attenuators MQ20 / MQ40 available as accessory for high inputs	Please click for details 1-channel charge / IEPE conditioner M68D1 M68D1: Rear panel 3-channel charge/IEPE conditioner M68D3 1-channel charge / IEPE conditioner module M68R1 M68R1: Power supply socket at rear side 6-channel case for M68R1 12-channel case for M68R1
Channels	1	3	1
Charge gain	0.1 / 1 / 10 / 100 / 1000 mV/pC	0.1 / 1 / 10 / 100 / 1000 mV/pC	0.1 / 1 / 10 / 100 / 1000 mV/pC
IEPE / voltage gain	0 / 20 / 40 / 60 dB	0 / 20 / 40 / 60 dB	0 / 20 / 40 / 60 dB
Low pass frequencies	0.1 / 0.3 / 1 / 10 / 20 / 50 kHz	0.1 / 0.3 / 1 / 10 / 20 / 50 kHz	0.1 / 0.3 / 1 / 10 / 20 / 50 kHz
High pass frequencies	3 Hz	3 Hz	3 Hz
Input / output connectors	BNC / BNC	BNC / BNC	BNC / BNC
Power supply	5 .. 15 V	5 .. 15 V	5 .. 15 V; 4 Mignon cells
	Data sheet (250 kB) Instruction manual (250 kB) Charge attenuators MQ20 / MQ40 (100 kB)

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 Please click for details M208A: Keypad and display M208A: Rear panel with interfaces and outputs M208A: Meter display M208A: Gain setting 8 Channel IEPE Conditioner M208B M208B: Rear panel M208B: Gain setting M208A/B: High pass and low pass modules M208A/B: Single and double integrator modules M208A: PC control software for RS-232 - channel settings M208A: PC control software for RS-232 - channel overview M208A: PC control software for RS-232 - device overview M208A: HTML page of embedded web server
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

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	Please click for details IEPE Supply Module M28 IEPE Conditioning Module M32 M28 with DIN rail adapter M32 with DIN rail adapter M28/M32: Power supply socket M32: Opened rear panel with low pass module FB2-...
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)	Instruction manual (100 kB)

Remote Charge Converter	NEW: 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	Please click for details Opened case with DIP switches for gain selection
Gain (selectable by DIP switches)	0.1 mV/pC 1 mV/pC 10 mV/pC
Frequency range	0.1 Hz .. 65 kHz (-3 dB)
Input / Output	BNC female / male
	Data sheet (200 kB) Instruction manual (500 kB)