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如何在模拟电路用好数字示波器，比如测音频放大器的小信号，电源的杂波等？ - Bluetooth forum - bluetooth蓝牙技术
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如何在模拟电路用好数字示波器，比如测音频放大器的小信号，电源的杂波等？


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  • btt
  • [btt]
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2020-10-25 12:53 #138 by btt
新帖
要注意的问题有：

　　① 示波器的接地问题，示波器的机壳和探头的参考地线都是连接地线的，因此良好的 接地是测量干扰的首要条件。

　　② 示波器参考地线引入的干扰问题，由于普通探头通常都有一段接地线，会与待测点 构成一个类似环形天线的干扰路径，引入 比较大的干扰，因此要尽量减少这一干扰，可以采用的方法是将探头帽拿掉，不使用探头上 引出的地线，而直接使用探头尖端和 探头内的地点接触待测点进行测量。

　　③ 使用差分测量的方法，消除共模噪声。泰克提供一系列的差分探头，比如专门针对 小信号的 ADA400A 可以测量到几百微伏，用于高速 信号测量的 P7350 提供高达 5GHz 的带宽。

　　④ 在泰克的很多示波器里提供高分辨率采集（Hi-Res）的信号捕获模式，可以过滤信 号上叠加的随机噪声。

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Deprecated: Method ReflectionProperty::setAccessible() is deprecated since 8.5, as it has no effect since PHP 8.1 in /var/www/html/plugins/system/falangdriver/falangdriver.php on line 100
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Error

HTTP 500 Whoops, looks like something went wrong.

mysqli object is already closed

Exception

Error

in /var/www/html/libraries/vendor/joomla/database/src/Mysqli/MysqliDriver.php (line 318)
  1. */
  2. public function disconnect()
  3. {
  4. // Close the connection.
  5. if (\is_callable([$this->connection, 'close'])) {
  6. $this->connection->close();
  7. }
  9. parent::disconnect();
  10. }
in /var/www/html/libraries/vendor/joomla/database/src/Mysqli/MysqliDriver.php -> close (line 318)
  1. */
  2. public function disconnect()
  3. {
  4. // Close the connection.
  5. if (\is_callable([$this->connection, 'close'])) {
  6. $this->connection->close();
  7. }
  9. parent::disconnect();
  10. }
in /var/www/html/libraries/vendor/joomla/database/src/DatabaseDriver.php -> disconnect (line 496)
  1. *
  2. * @since 2.0.0
  3. */
  4. public function __destruct()
  5. {
  6. $this->disconnect();
  7. }
  9. /**
  10. * Alter database's character set.
  11. *
DatabaseDriver->__destruct()

Stack Trace

Error 
Error:
mysqli object is already closed

  at /var/www/html/libraries/vendor/joomla/database/src/Mysqli/MysqliDriver.php:318
  at mysqli->close()
     (/var/www/html/libraries/vendor/joomla/database/src/Mysqli/MysqliDriver.php:318)
  at Joomla\Database\Mysqli\MysqliDriver->disconnect()
     (/var/www/html/libraries/vendor/joomla/database/src/DatabaseDriver.php:496)
  at Joomla\Database\DatabaseDriver->__destruct()

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