MODEL 149 DUAL CHANNEL CHARGE AMPLIFIER
Features
- Compact – 16 channels per GPSC rack
- Acceleration/displacement outputs
- Controls in engineering units
- Internal calibration
Description
The Model 149 is an economical, two-channel-per- module charge amplifier that plugs into Encore’s 19″ GPSC Instrumentation Rack. Up to eight modules (16 channels) can be placed in a single GPSC rack. Modules are available for strain, F/V, charge, accelerometer, proximitor, DC signal and LVDT signal conditioning. The GPSC rack features and integrate AC power supply that provides the required unregulated DC voltages to operate the modules. The continuously adjustable, ten-turn locking dial sets channel sensitivity from 1 to 110pC/g. Outputs are AC acceleration and RMS/DC displacement. The front panel features a push button or remote CAL command that applies a 1000pC 350Hz calibration signal to both channels simultaneously.
Specifications
| Input signal: | Charge output from accelerometer |
| Input sensitivity: | Front panel locking dial, adjustable from 1 to 11pC/g or 10 to 110pC/g, with internal 1 or 10 gain select jumper |
| Acceleration gain: | Front panel switch selects 10mV/g or 100mV/g |
| Acceleration frequency response: | 5Hz to 15kHz (factory adjustable) |
| Integration: | Two stages convert acceleration to displacement, with unity gain frequency factory set at 350Hz |
| Displacement gain: | Front panel switch selects 10mV/mil or 100mV/mil |
| Displacement frequency response: | 15Hz to 15kHz, adjustable with components on plugin header |
| Acceleration output: | ±10V max, 10mA peak load |
| DC output: | DC voltage equal to RMS value of either acceleration or displacement signal, selected by front panel switch; +7VDC max |
| Calibration: | 500pC (peak) at 350Hz sinewave, applied to both channels simultaneously when front panel pushbutton is pressed, or on rack CAL command |
| Maximum signal input: | 12000pC peak, up to 2kHz |
| Power: | Unregulated ±24V from rack-mounted supply |
| Mechanical: | 19″W x 5.25″H x 9″D, eight module (16 channel) rack adapter, Model 4015-113 |