Manufacturer of electronic instrumentation including signal conditioners, custom power supplies, computer controlled amplifiers and computer controlled signal conditioning instrumentation.

快乐飞艇三期计划

MODEL 176 DUAL CHANNEL CHARGE AMPLIFIER MODULE

Description

The Model 179 computer-controlled charge amplifier module features variable gain and output scaling and accepts either differential or single-ended inputs. Adjustable parameters include: accelerometer sensitivity, differential or single-ended mode, scaling, filter setting, external calibration and zero mode.

Input Channel A = chargev

Accel sensitivity: Any value from 2.0 to 200pC/g
Output scaling: 1mV/g, 10mV/g, 20mV/g, 100mV/g
Gain accuracy: ±1%
Input mode: Differential or single-ended (-IN tied to common)
Maximum input: 50,000pC peak per input (50,000pC differential):
2,800pC peak with sensitivity set to 2.0 –   9.9pC/g
12,500pC peak with sensitivity set to 10  – 49.9pC/g
50,000pC peak with sensitivity set to 50  –  200pC/g
Frequency response: 20kHz at 50,000pC peak input level, increasing to >35kHz at 25,000pC peak input level (or lower)
Calibration: Internal 1015pf ±1% capacitors convert ExtCal voltage signal to charge, which can be applied to amplifier front end
Zero mode: Relays replace charge converter output with short to common

 

Input channel B = millivolt, with optional 4mA excitation for transducer

Calibration: External ExtCal voltage signal can be applied to front end
Excitation: 4mA constant current can be tied to +S, with -S tied to common
Gain: 1 or 100

 

Features common to both output channels

 Filter: Eight-pole Butterworth lowpass at 12Hz, plus OUT, six-pole Butterworth highpass at 5kHz, 15kHz or 25kHz
Filter input signal: Select either charge input or millivolt input
Pre-integration Filter: Three-pole Butterworth lowpass at 250Hz, 500Hz, or 1kHz
Integration Select: Accel, velocity, displacement, or unfiltered (5Hz-12kHz) accel
 RMS/DC Select: Either AC signal or DC representation or RMS value
Limit Detect: Two front-panel LEDs indicate saturation at charge amp, before filters, and at integration stages
Offset: Less than 5mVDC at output
Noise: Less than 3mV RMS, filter in, input disconnected

Mechanical: 5.5” x 13.5” board, used with Model 5020-102 rack
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