MSOX2012A WaveGen选项电压输出问题

我安装了带有WaveGen选件的Agilent 2000示波器。
我用来测试ti的ADC模块，特别是它是ADS1278EVM模块。
我让WaveGen产生一个没有偏移电压的5VPP正弦波。
当我将示波器输入连接到wavegen输出时，我看到正弦波，但电压显示0.3VPP（约0.3V~，rms，我也安装了DVM选件）。
我看到这两个都是高z设置和50欧姆。
我将WaveGen接地连接到示波器接地。
这正是我通过我的ADC模块观察到的（我有一个FPGA，因为我的dsp连接到我的电脑）。
你能不能请问为什么我没有看到完整的5VPP？



     以下为原文

  I have a Agilent 2000 oscilloscope with WaveGen option installed. I am using to test an ADC Module from TI, specifically it is ADS1278EVM module.

I have the WaveGen generating a 5VPP sine wave with no offset voltage. When I connect my oscilloscope input to the wavegen output I see the sine wave but the voltage is showing 0.3VPP (about 0.3V~, rms, I also have the DVM Option installed). I see this both with high-z setting and 50ohm. I have the WaveGen ground connected with the oscilloscope ground.
This is exactly what I observe through my ADC module as well (I have an fpga as my dsp connected to my computer).

Can you please advice why am i not seeing the full 5VPP?