- 积分
- 8012
- 在线时间
- 2302 小时
- 最后登录
- 2016-5-22
- 阅读权限
- 150
- 精华
- 17
- UID
- 6
- 帖子
- 6498
- 精华
- 17
- 经验
- 8012 点
- 金钱
- 1636 ¥
- 注册时间
- 2004-3-16
|
<div class="quote"><b>以下是引用<i>JiangWZ</i>在2006-6-25 15:39:00的发言:</b><br/><p class="MsoNormal" style="MARGIN: 0in 0in 0pt; tab-stops: 276.0pt;"><span lang="ZH-CN" style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">昨天试了一下放大器对负载变化的控制能力,实验中放大器的输入端不接信号但将输出串联一个</span><span style="FONT-SIZE: 10pt;"><font face="Times New Roman">3.9</font></span><span lang="ZH-CN" style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">欧大功率电阻接到另外一台功放(</span><span style="FONT-SIZE: 10pt;"><font face="Times New Roman">LM3886</font></span><span lang="ZH-CN" style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">制成)的输出端,再把</span><span style="FONT-SIZE: 10pt;"><font face="Times New Roman">1</font></span><span lang="ZH-CN" style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">千周的正弦波输入到</span><span style="FONT-SIZE: 10pt;"><font face="Times New Roman">3886 </font></span><span lang="ZH-CN" style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">功放,把</span><span style="FONT-SIZE: 10pt;"><font face="Times New Roman">3886</font></span><span lang="ZH-CN" style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">输出端的电压调到</span><span style="FONT-SIZE: 10pt;"><font face="Times New Roman">8VRMS</font></span><span lang="ZH-CN" style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">,这时供电器正负电流消耗大约是1</span><span style="FONT-SIZE: 10pt;"><font face="Times New Roman">.1A</font></span><span lang="ZH-CN" style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">,实验中放大器输出端量到的电压是</span><span style="FONT-SIZE: 10pt;"><font face="Times New Roman">45mV RMS</font></span><span lang="ZH-CN" style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman';">而不是零,这显示放大器无法把外来的电流变化彻底摆平。</span><span style="FONT-SIZE: 10pt;"><p></p></span></p><p></p><p></p></div>江兄,可以考虑用这种方法,偿试通过输入不同的正弦波信号,来优化校正电桥网络的参数-----业余条件下此参数不易校正. |
|