EM Electronics A22 直流毫伏放大器 A23 直流放大器 EM放大器
品牌：EM Electronics
类别：直流毫伏放大器
型号：A22

公司介绍：
   EM Electronics专注于精密、超低电平直流电压放大器和超低电平DC测量仪器的设计和制造。
应用于标准、校准、科学研究、低温学、量热法、声纳探测、超灵敏温度测量、自动测试等领域。
  EM Electronics有一个研究新仪器和技术的项目，正在继续开发我们非常受欢迎的直流毫伏放大器模块。
  EM Electronics正在开发新的超低电平直流测量仪器，该仪器将具有更先进的规格，是低温计量和常温测量的理想选择。
   EM Electronics还将扩大直流毫伏放大器模块的范围，不久将宣布更多模块。
   EM Electronics正在开发一系列隔离器，用于直流纳伏放大器，这将使测量超低电平更加容易。

产品简介：
  A22型EM DC放大器是一种低噪声放大器模块，适用于灵敏的DC测量、数据采集和系统，是使用热电偶进行非常灵敏的温度测量的理想选择。
A22的噪声水平相当于一个约150欧姆的完美电阻。
当与普通型热电偶一起用于温度测量时，可以实现约20微开尔文的灵敏度。输入电压漂移非常低，与约1纳伏的电压灵敏度兼容。
A22具有测量放大器中所需的许多其他特征。100T或280dB的非常高的环路电压增益意味着可以使用高的整体增益，由反馈电阻器精确控制，从而确保良好的线性，其精度由所使用的反馈电阻器定义。
A22型EM DC放大器是一种低噪声放大器模块，适用于灵敏的DC测量、数据采集和系统，是使用热电偶进行非常灵敏的温度测量的理想选择。
A22的噪声水平相当于一个约150欧姆的完美电阻。
当与普通型热电偶一起用于温度测量时，可以实现约20微开尔文的灵敏度。输入电压漂移非常低，与约1纳伏的电压灵敏度兼容。
A22具有测量放大器中所需的许多其他特征。100T或280dB的非常高的环路电压增益意味着可以使用高的整体增益，由反馈电阻器精确控制，从而确保良好的线性，其精度由所使用的反馈电阻器定义。
产品参数：
Specification: DC Amplifier Model A22
Noise
Equivalent noise resistance approximately 150 ohms. Peak to peak noise voltage depends on bandwidth selected e.g. rise time constant 1 second, peak to peak noise voltage is approximately 3 nano-volts with the rms equivalent being about 600 pico-volts.

Offset Voltage
This is adjustable to zero by introducing a current into the feedback terminal. The internal feedback resistor is 10 ohms and so an adjustment current of plus and minus 10 nano-amps will give a voltage offset in the range of plus and minus 100 nano-volts. This is achieved by connecting a 1 Meg-ohm potentiometer across the internal supply, pins 11 and 12 and connecting a 500M ohm resistor from the wiper to the feedback connection, pin 4. The temperature coefficient of offset voltage is typically 1 nV per degree C. The initial, unbalanced offset voltage is typically plus or minus 50nV.

Offset Current
This is adjustable to zero, in a similar manner to the offset voltage adjustment, but using a 10 M-ohm resistor to pin 6. The temperature coefficient of offset current is typically 2 pA per degree C. The initial, unbalanced offset current is typically plus or minus 100pA.

Gain and Bandwidth
Open loop voltage gain 100T or 280dB. This gain is reduced to unity at 20KHz, at a rate of 30dB per decade. The amplifier is stable with 100% feedback.

Input Resistance

Greater than 1G ohm at DC.

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