N9918A配置Gdelay格式测量的比例时出现问题

嗨，我尝试使用命令SCPI配置S21测量的Gdelay格式的每格的比例（以纳秒为单位）：DISP：WIND：TRAC1：Y：PDIV 1.0E-9但是我有这个错误：-222：值1.5
E-08被剪裁到最小值0.01。
我想我需要更换仪器上的比例单位，但我没有在文档中找到相应的功能!!
我试图在我的命令中指定单位，但我得到错误：-131：无效后缀我有什么想法解决我的问题？
有关信息，我的FieldFox N9918A具有固件版本A.06.18和选项：10,112,210,211,233,235,236,302,307,308,309和310.在此先感谢您的支持



     以下为原文

  Hi,

I try to configure the scale per division for the Gdelay format of a S21 measure in nanosecond with the command SCPI :  
DISP:WIND:TRAC1:Y:PDIV 1.0E-9

But I have this error : -222 : the value 1.5E-08 was clipped to the minimum value of 0.01.

I think I need to change the unit for the scale like on the instrument but I don't find the corresponding function in the documentation!!  
I have tried to specify in my command the unit but I obtain the error : -131: Invalid suffix  

I have you any idea to solve my problem?

For information, my FieldFox N9918A have the firmware version A.06.18 and the options: 10,112,210,211,233,235,236,302,307,308,309 et 310.

Thanks in advance for your support