CST能否自己设置时间步长

大家好，我想了解一下CST中能否手动设置仿真的时间步长?
我们在仿真的时候，因为不关心一些金属细节，就把最小网格的绝对值提高了几倍，这个时候在仿真的时候会出现不稳定，CST会自动调整时间步长，重新计算，然后不稳定，继续降低时间步长，直到稳定为止，因此我们的问题是能否通过一开始的时候自己设置时间步长?
logfile在二楼粘贴一下

*** Warning ***
The calculation seems to be unstable！ Transient solver is restarted with a
scaled timestep by 0.85.
--------------------------------------------------------------------------------
Units settings:
  Dimensions: mm
  Frequency:  GHz
  Time:       ns
--------------------------------------------------------------------------------
*** Warning ***
34 mesh cells are represented in staircase mode and have been filled with PEC.
8 mesh faces are represented in staircase mode and have been filled with PEC.
More...
--------------------------------------------------------------------------------
Number of mesh faces filled with PEC due to fill limit restrictions: 43319
--------------------------------------------------------------------------------
Number of mesh edges filled with PEC due to edge topology restrictions: 866
--------------------------------------------------------------------------------
Boundary conditions:

可以，回答完毕。CST MWS帮助文件《Special Solver Parameters - General》：
Stability factor for timestep: Enter here a stability factor that will be multiplied to the current valid stability limit for the numerical timestep. In case that a time domain calculation shows some slight effects of instability, a small reduction of the stability factor might recover a stable state. Note: Choosing a factor greater than one is not advisable and will likely produce instability.
不过我所见过的所有instability的情况都是其它的原因。

谢谢何大哥的回复，但是之前我看到这句话，我的理解是他说通过降低这个稳定系数来让求解器计算，而不是直接给我们权限设置步长吧?

还有就是不知道你能否举两个简单的例子来说明一下您遇到的情况哇?学习一下嘿嘿

步长是由最小网格尺寸决定的，没听说过能单独设置。
绝大多数情况下仿真不稳定是因为其它的原因：比如波导端口放置在开放边界以内而且没有shielding，等等。具体问题具体分析。

最大最小网格比过大会出现这个问题，不是很理解原理