LE-41 CHARGE AMPLIFIER, 4 CHANNELS, BANDWIDTH 0.3 HZ - 22 KHZ > Auxiliary equipment

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LE-41 CHARGE AMPLIFIER, 4 CHANNELS, BANDWIDTH 0.3 HZ - 22 KHZ

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작성자최고관리자 댓글 0건 조회 34회 작성일 19-03-09 20:34

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Purpose
비 휘발성 메모리의 설정 기억
독립 채널 4 개
설정은 비 휘발성 메모리에 저장됩니다.
RS-485 제어 인터페이스
입력 라인에서의 단선 또는 단락 회로 감시의 소프트웨어 제어 기능
Features
소프트웨어 설치 대역폭

 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)
15 fC (in the transmission bandwidth of 0.3 ... 22000 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
  • Storage of calibration factors and serial number for software access to them from RS-485.
  • Storage of specified settings (in particular, when using LE-41 without software control).
  • Program on/off test mode (for checking the integrity of the input circuit of each channel).
  • Software control of the input range and the upper frequency of the bandwidth.
Power supply
From LTR22LTR24-1 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
  • Plastic case
  • Screening inside the case
  • Potential technical possibility of application in embedded systems (including without case)
  • Separate ground terminal
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 LTR24-2LTR25) that can directly connect ICP sensors.

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