E1340A VXI卡校准该怎么调整？

我不知道是否有人可以帮我解决这个问题。
我有一个E1340A，我需要调整直流输出。
虽然单位在规格中所有的读数都有点高，我想尝试让它们更接近标称。我已经在服务手册中执行了cal程序，这似乎只是将实际输出与
编程输出，如果在规格范围内，则不进行调整。
我已经多次完成调整过程并且它似乎没有改变输出精度。我有另一个单元，当我指向调整例程的第1点时报告“222”错误代码。
一旦发生这种情况，设备将不再响应* RST以外的任何命令。
我注意到该单元在1点的输出电压与我所拥有的其他单元不同。
这是什么意思？有没有人知道是否有办法“强制”单位调整校准常数，以便我可以使读数更接近标称值。
任何帮助，将不胜感激。
我已经把头发拉了好几天了!!!非常感谢西蒙。



     以下为原文

  I don't know if anyone can help me with this problem. I have a E1340A that I need to adjust on DC output. Although the unit is in spec all of the readings are a bit high and I want to try and get them a bit closer to nominal.

I have carried out the cal procedure in the service manual and that just seems to compare the actual output to the programmed output and does not adjust it if it is within the spec of the unit. I have run through the adjustment procedure several times and it does not seem to alter the output accuracy.

I have another unit that reports back a "222" error code when I do point 1 of the adjustment routine. Once this happens the unit will no longer respond to any command other than *RST. I have noticed that the output voltage of this unit at point 1 is different to the other unit I have. What does this mean?

Does anyone know if there is a way to "force" the unit to adjust the calibration constants so that I can get the readings closer to nominal.

Any help would be appreciated. I have been pulling my hair out for days on this now!!!

Many Thanks

Simon.