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Application
• Signal conditioning for dynamic measurement with piezoelectric sensors for acceleration, force and pressure or microphones
• Front-end with anti-aliasing filter for PC data acquisition systems
• Multichannel measuring systems
Properties
• M68D1 and M68D3 are bench top instruments, the M68R1 is suited for 19 inch rack mounting
• Model M68D3 has 3 amplifier channels
• Inputs for both charge mode transducers and transducers with constant current supply (IEPE)
• 5 charge ranges, 4 IEPE ranges
• Output either without integration or with single or double integration
• Selectable low-pass filter with 0.1 / 0.3 / 1 / 10 / 20 / 50 kHz
• High-pass filter with 0.1 and 3 Hz
• Minimum level (> 5 %) and overload LED indicators
• Easy adjustment by rotary switches
• Low noise
• Powered by external DC voltage source from 5 to 15 V or mains
• Model M68D1 can be powered also by internal batteries
• Bench top cases for 6 or 12 M68R1 modules available
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M68D1
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M68D3
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M68R1
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Number of amplifier channels
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1
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3
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1
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Inputs
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Charge input and IEPE input, single ended, BNC socket
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Gain
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0.1 / 1 / 10 / 100 / 1000 mV/pC or. 1 / 10 / 100/ 1000 mV/mV, by rotary switch
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Measuring range for stated accuracy
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Charge: 1 pC .. 100 000 pC*; voltage: 1 mV .. 10 V (peak values, 3 Hz .. 20 kHz)
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Frequency range of integrators
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3 .. 1000 Hz (first integrator), 3 .. 100 Hz (second integrator)
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Output
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± 10 VPP, DC coupled, offset error < 10 mV, ROUT = 100 Ω, BNC socket
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Operating temperature range
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-10 .. 55 °C, 95 % relative humidity, no condensation
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