CVA Signal Conditioners

• 4 (CVA-4) or 8 (CVA-8) channels
• Operates with piezo accelerometers, remote charge pre-amps and self-amplified accelerometers
• Switchable 10, 100 mV/g (or mV/U) output for controllers
• Three pole low-pass filtering
• Dial-A-Gain input sensitivity normalization
• Buffered monitor outputs on front panel
• Low cost per channel

The models CVA-4 and CVA-8 are designed to be a low-cost accessory for the APEX SL Windows-based vibration control workstation. They provide either 4 or 8 channels of conditioned acceleration signals for the control or measurement inputs of the Windows-based vibration control workstation or other vibration controllers.

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Specifications

General

4 or 8 channels of signal conditioning with separately regulated power supplies for each charge amplifier. Common signal references for all channels.

Inputs

• Charge Input: Any single-ended piezoelectric transducer with shunt resistance greater than 10 megohms - Source capacitance of 50 nF causes less than 0.1% gain change - Max. input 13,000 pC (1-10 pC/g); 130,000 pC (10-100 pC/g).
• Voltage Input: Coaxial connection to a remote pre-amp/self-amplified accelerometer. Constant current internally adjustable from 2 to 6 mA - 24 VDC compliance voltage.
• Charge Calibration: Provides a series 1,000 pF ± 1/2% capacitor for connection to any charge input.
• Voltage Calibration: Provides decoupling of the DC current from the external calibration signal source after connection to any voltage input.

Outputs

• Rear Panel: BNC output connector ± 10 V pk at 10 mA total current. Switch selection of 10 or 100 mV/g sensitivity.
• Front Panel: BNC output connector with same characteristics as rear panel connector - buffered from rear panel connector and short-circuit protected.

Input Sensitivity Normalization

Provided by a range switch (10 or 100 mV-pC/g max) and a precision 10 turn dial for two ranges: 1-10 pc-mV/g and 10-100 pC-mV/g (actually 0.3 to 10.3 and 3 to 103 pC-mV/g).

Noise

.005 pC rms + .0015 pC/1nF source capacitance RTI plus 0.1 mV p-p RTO with 5 kHz LPF.

Front Panel Controls

• Input sensitivity range (10 max, 100 max)
• Input sensitivity vernier (0.03 to 1.03 times max value) - 10 turn precision potentiometer and dial
• Input selector (charge or voltage)
• Output sensitivity (10, 100 mV/g)
• Buffered output (isolated BNC)

Rear Panel Controls/Connectors

• Charge input (isolated 10-32 miniature coax)
• Voltage input (isolated BNC)
• Output (isolated BNC)
• Int-ext ground switch
• Line voltage selector switch (115/230V)
• Charge and voltage calibration connectors

Physical

• Standard Unit Power: 105-125/210-250 VAC; 50/60 Hz, 8 VA (CVA-4), 12 VA (CVA-8)
• Standard Unit Dimensions: 17"W x 3.4"H x 13"D with brackets suitable for mounting in a standard 19 inch rack.
• Frequency Response: A three-pole Butterworth filter determines the high frequency response. The frequency (fu) is typically chosen to be 3 kHz, but may be customer specified at 1, 2, 5, or 10 kHz.