电荷放大器的输出电压和输入电荷成正比，可作为差分压电式加速度传感器，或其它差分电荷量输出传感器输出信号的适调、放大及预处理。DH5865差分电荷放大器是一种可编程、高准确度、差分输入型电荷放大器，若配接高温型差分传感器，可广泛应用于各种在高温环境下的旋转机械振动测量。
特点
所有参数均可面板手动控制
高、低通滤波器可调截止频率，阻带衰减大
很宽的放大器输出灵敏度调节范围
准确度高
差分电荷放大器抗干扰能力强
具有交流、总值输出功能
具有自校功能
Intrinsically-safe, DIN mount, differential charge amplifier, 10 mV/pC
Sensitivity: (+/-5%) 10 mV/pC (10 mV/pC)
Output Voltage: +/-2.5 Vpk
Temperature Range: -40 to +176 °F (-40 to 80 °C)
| Performance | |||
| Sensitivity (+/-5 %) | 10 mV/pC | 10 mV/pC | |
| Input Range | +/-250 pC | +/-250 pC | |
| Low Frequency Response (+/-5 %) | 5 Hz | 5 Hz | |
| High Frequency Response (+/-5 %) | 10 kHz | 10 kHz | [1] |
| Amplitude Linearity | ≤1 % | ≤1 % | |
| Environmental | |||
| Hazardous Area Approval | IECEx LCIE 130002X | IECEx LCIE 130002X | |
| Hazardous Area Approval | LCIE 13 ATEX 3031X | LCIE 13 ATEX 3031X | |
| Hazardous Area Approval | Ex ia IIC T4 Ga | Ex ia IIC T4 Ga | |
| Hazardous Area Approval | LCIE 13 ATEX 1010X | LCIE 13 ATEX 1010X | |
| Hazardous Area Approval | Ex nA IIC T4 Gc | Ex nA IIC T4 Gc | |
| Hazardous Area Approval | Class I Div 1 Groups A, B, C, D | Class I Div 1 Groups A, B, C, D | |
| Hazardous Area Approval | Class I Div 2 Groups A, B, C, D | Class I Div 2 Groups A, B, C, D | |
| Temperature Range | -40 to +176 °F | -40 to 80 °C | |
| Temperature Response | ≤1 % | ≤1 % | |
| Relative Humidity (Non Condensing) | <95 % | <95 % | |
| Electrical | |||
| Excitation Voltage | 22 to 28 VDC | 22 to 28 VDC | |
| Output Bias Voltage | 10 to 12 VDC | 10 to 12 VDC | |
| Output Voltage | +/-2.5 Vpk | +/-2.5 Vpk | |
| Constant Current Excitation | 3.1 to 4.1 mA | 3.1 to 4.1 mA | |
| Broadband Electrical Noise (1 to 10000 Hz) | 200 µV | 200 µV | [2] |
| Spectral Noise (1 Hz) | 50 µV/√Hz | 50 µV/√Hz | [2] |
| Spectral Noise (10 Hz) | 15 µV/√Hz | 15 µV/√Hz | [2] |
| Spectral Noise (100 Hz) | 5 µV/√Hz | 5 µV/√Hz | [2] |
| Spectral Noise (1 kHz) | 2 µV/√Hz | 2 µV/√Hz | [2] |
| Spectral Noise (10 kHz) | 2 µV/√Hz | 2 µV/√Hz | [2] |
| Discharge Time Constant | >0.25 sec | >0.25 sec | |
| Resistance | >50000 Ohm | >50000 Ohm | |
| Source Capacitance Loading | 0.0003 %/pF | 0.0003 %/pF | |
| Output in Relation to Input | In Phase | In Phase | |
| Physical | |||
| Electrical Connector (Input) | Terminal Strip | Terminal Strip | |
| Electrical Connector (Output) | Terminal Strip | Terminal Strip | |
| Mounting | DIN Rail | DIN Rail | |
| Case Material | Injected Molded Nylon | Injected Molded Nylon | |
| Weight | 5.1 oz | 145 gm | |
差分高精度低温漂低偏移电荷放大器的制造方法
提供了一种差分高精度低温漂低偏移电荷放大器，具有对电荷信号放大精度高，温度漂移小，偏置电压小的优点，可用于对振动电荷信号的放大。该放大器结构包括依次连接的过载保护电路、差分电荷转换电路、低通滤波电路、高通滤波电路和用以对这些电路供电的电源转换电路；其中差分电荷转换电路包括第一反相放大电路、第二反相放大电路和减法运算电路；电荷信号Qp正极、负极分别经电容接入第一反相放大电路、第二反相放大电路，这两个反相放大电路的反馈电阻支路与同一RC串联支路分别组成T型网络；第一反相放大电路和第二反相放大电路的输出分别作为正相输入和负相输入接入减法运算电路
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