Model 123 PE/IEPE signal conditioner0 pages

Model 123
PE / IEPE signal conditioner
Features

Description

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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.