Model 123 PE/IEPE signal conditioner
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Model 123 PE/IEPE signal conditioner - 1

Model 123 PE / IEPE signal conditioner Features The model 123 is a new microprocessor controlled 3-channel signal conditioner for Piezoelectric (PE) or Integrated Electronic Piezoelectric (IEPE) sensors. The model 123 incorporates a charge amplifier when used with PE sensors. An integral 0, 4 or 10 mA, user selectable, current source with 20 Vdc compliance voltage is utilized with IEPE sensors. A user friendly interface allows programming Input Sensitivity and Output Sensitivity, then allowing the instrument to calculate the amplifier gain. All gain selections are stored in non-volatile memory and reinitialized when power is applied. Gain can also be entered directly if desired. Three-channel PE/IEPE signal conditioner 230 kHz bandwidth (±5%) Optional HP and LP filters for each channel Gain calculation Gain range from 0.00 to 999.9 The model 123 utilizes a microprocessor SLEEP mode to eliminate high frequency clock noise and their associated harmonics. The microprocessor WAKES momentarily to acknowledge front panel switch depressions, then goes to SLEEP immediately after processing and executing the requested function. This allows the amplifiers to operate with minimum self generated noise and provides clean, clock free amplified signals. The model 123 also uses low noise linear voltage regulators instead of switching regulators to minimize interference. The model 123 uses 12 bit DACs, for each channel, to set amplifier gains from 0.00 to 999.9 with 0.5% precision. Amplifier gains can be changed “on the fly” without damage to the instrument. The model 123 provides 1.5 Hz to 230 kHz broadband frequency response, with optional plug-in, 4-pole Butterworth high pass and low pass filter modules available. Filter selection is provided via rear panel switches. Front panel annunciate LEDs display filter selections. Each channel can drive 10 mA into a 1k ohm load. The model 123 channel-to-channel signal ground is non-isolated. However, signal ground is isolated from power ground. An internal DIP switch allows shorting signal ground to power ground. A rear panel voltage selector switch allows selection of 100, 115 or 230 Vac, 50-60 Hz, input power. The model 123 is designed for CE compliance for EMC emissions and immunity and for product safety.

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Model 123 PE/IEPE signal conditioner - 2

Model 123 PE / IEPE signal conditioner Specifications The following performance specifications conform to ISA-RP-37.2 (1964) and are typical values, referenced at +75˚F (+24˚C) and 100 Hz, unless otherwise noted. Input specifications (per channel) Piezoelectric Maximum charge input Source resistance Source capacitance IEPE Constant current source Accuracy Compliance voltage Maximum input voltage Input impedance Single-ended with one side connected to signal ground 10 000 pC > 10 MΩ < 10,000 pF Single-ended with low side connected to signal ground None, 4 mA or 10 mA selectable per channel ±...

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Model 123 PE/IEPE signal conditioner - 3

Model 123 PE / IEPE signal conditioner Specifications The following performance specifications conform to ISA-RP-37.2 (1964) and are typical values, referenced at +75˚F (+24˚C) and 100 Hz, unless otherwise noted. Calibration data, traceable to National Institute of Standards and Technology (NIST), is supplied. Front Panel Programmable Functions (per channel) Sensitivity (pC/EU or mV/EU) 0.01 to 99.99 100.0 to 999.9 1000 to 9999 Output scaling (mV/EU) 0.01 to 99.99 100.0 to 999.9 1000 to 9999 Gain (calculated) 0.00 to 999.9 Gain (front panel settable) 0.00 to 999.9 Memory Serial EEPROM (1K...

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