LE-41 CHARGE AMPLIFIER, 4 CHANNELS, BANDWIDTH 0.3 HZ - 22 KHZ
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외부 모듈 LE-41은 4 채널 전하 증폭기입니다. 진동 측정 작업을위한 압전 센서 (가속도계)의 정합 장치로 사용됩니다.
LE-41은 LTR22, LTR24, E14-140M ADC 모듈 (전원 공급 장치) 또는 LTR11과 인터페이스 할 수 있습니다. 맞춤형 케이블을 제작할 수 있습니다.
LE-41 앰프는 LTR43 컨트롤 모듈이나 RS-485 / RS-485 인터페이스를 통한 LTR-EU 크레이트와 같은 RS-485 인터페이스가있는 제어 모드 또는 순서대로 사전 설정으로 사용할 수 있습니다. 422-UART 케이블 또는 컴퓨터에 연결된 모든 RS-485 어댑터에 연결하십시오.
LE-41은 다음 모드를 지원합니다 : 채널 별 소프트웨어 감도 전환과 제어 된 저역 통과 필터의 대역폭 상한, 입력 회로 파손 제어.
| Amplifier | |
| Number of channels | 4 |
| Transmission ratio | 0.9 mV/pC, 10 mV/pC |
| Accuracy of transmission ratio | ± 9% without calibration ± 1% with calibration |
| The lower limit of bandwidth frequencies | 0,3 Hz (at –3 dB level) |
| The upper limit of bandwidth frequencies | 2200 Hz, 22000 Hz (at –3 dB level) |
| The decay of the frequency response above 20000 Hz | Not less than 12 dB/octave |
| The decay of the frequency response below 0.3 Hz | 12 dB/octave |
| Inter-channel signal interference | Not worse than -90 dB |
| Charge input | |
| Maximum charge amplitude in the passband, nC | 9.0 (for a transmission ratio of 0.9 mV/pC) 0.8 (for a transmission ratio of 10 mV/pC) |
| Typical value of the noise level, reduced to the input (with a capacity of source of charge 1000 pF) |
6 fC (in the transmission bandwidth 0,3 ... 2200 Hz) |
| Connectors | TNC (4 pcs) |
| Voltage outputs with common ground | |
| Output peak-peak voltage, not less than | ±8 V (1 mA) |
| Output impedance | 62 Ohm ± 1% |
| Output bias voltage | Not more than ±10 mV |
| Connector | DRB-25F |
| Controller | |
| Type | ATMEGA88 |
| Control interface | RS-485, eg from LTR43 module or other system |
| The main functions of microcontroller |
|
| Power supply | |
| From LTR22, LTR24-1 module or an external bipolar voltage source | +12…+15 V (not more than 30 mA) -12…-15 V (not more than 16 mA) |
| Design | |
| Dimensions | 95х150х26 mm |
| Design features |
|
| Operating condition | |
| Operating temperature range | -40...+55 ºС (without condensation of moisture, without contact with chemically aggressive substances) |
For more detailed technical information, see Manual.
For your reference: The charge amplifiers can be used to obtain the signal from charge sources (sensors having a piezo-crystal without a built-in amplifier) and to convert it into an output signal (voltage) suitable for feeding to a general-purpose ADC. This is a traditional (historical) way for accelerometers for vibrometry tasks. But there is a modern alternative way to build such systems — to use accelerometers with built-in amplifier and current supply (ICP-sensors) in conjunction with ADCs (such as LTR24-2, LTR25) that can directly connect ICP sensors.