相移33120A和33250A的问题

您好，我有一个设置33120A驱动振动样本和33250A控制短光脉冲（约振动周期的1/100）照亮样本。
当我将照明频率偏移到例如1 Hz时，我看到样本显然以预期的1 Hz振荡（真实振荡频率以千赫兹为单位）。
我想要实现的是设置驱动和照明脉冲频率相等并控制信号的相位差，以便在振荡周期的不同阶段对我的样本成像。
我通过10MHz时钟电缆同步了两个发生器。当我手动调整33120A的相位（较新的没有手动菜单选项）时，我看到样品移动对应于我刚刚调整的相位。
我的问题是，当通过GPIB向发生器（任一个）发送PHAS 180.0等命令时，我看不到位置的移动或改变。
GPIB查询“PHAS？”
确认发电机收到了我的命令。这里似乎有什么问题？
任何想法？Lauri Kangas，芬兰



     以下为原文

  Hello,

I have a setup with 33120A driving a vibrating specimen and 33250A controlling short light pulses (about 1/100th of the vibration period) illuminating the sample.

When I offset the illumination frequency at, say, 1 Hz I see the sample apparently oscillating at 1 Hz as expected (the true oscillation frequency is in the kilohertz scale). What I like to achieve is to set the drive and illumination pulse frequencies equal and control the phase difference of the signals in order to image the my sample at different phases of the oscillation period. I have got the two generators synchronized via the 10MHz clock cable.

When I manually adjust the phase of 33120A (the newer one doesn't have a manual menu option) I see the sample moving corresponding to to the phase I just adjusted.

My problem is that when sending PHAS 180.0 etc. commands to the generators (either one) via GPIB, I see no movement or change in position. A GPIB query "PHAS?" confirms that the generators received my commands.

What seems to be the problem here? Any ideas?

Lauri Kangas, Finland