U1271A电阻测量问题

我最近用一系列新的安捷伦设备更新了我的工作台。
到目前为止，我很享受自己，但我对我的新U1271A的阻力设置有一个奇怪的意义。
如果我在“自动”模式下短接引线，我将测量大约.15欧姆。
正常和预期的行为。
当我按下“范围”按钮时，会发生有趣的事情。
当我反复按下范围按钮来改变范围时，我似乎保留了一两个数字，意味着在最低范围内，我会看到.15欧姆的读数，但是如果引线短，我会得到“0.006”的读数
“3k范围和3 meg范围内的”0.0002“。
这意味着3兆范围内的短读数为200欧姆。
我把这个单元带到了经销商那里，我们都抓住了这个行为。
然后，我们将经销商的U1273A从展示柜中拿出来并观察到类似的行为。
我们错过了什么吗？
也许某个设置会导致这种意外行为？
也许它需要固件更新？
任何建议都会有所帮助，因为这种行为会导致我在使用此仪表时倾向于阅读我的读数。
提前感谢您提供的任何帮助。



     以下为原文

  I've recently updated my bench with a host of new Agilent equipment.  So far, I'm enjoying myself but I have one oddity with the resistance setting on my new U1271A.  If I short the leads in "Auto" mode, I'll measure roughly .15 ohms.  Normal and expected behaviour.  The interesting thing happens when I press the "Range" button.  As I press the range button repeatedly to change ranges, I seem to retain a digit or two, meaning on the lowest range I'll see a reading of .15 ohms but with the leads short, I'll get a reading of "0.006" on the 3k range and "0.0002" on the 3 meg range.  That means a short reads 200 ohms on the 3 meg range.  I brought the unit to the dealer and we all scratched our heads at this behaviour.  We then got the dealer's U1273A out of the show case and observed a similar behaviour.  Are we missing something?  Perhaps a certain setting cause this unexpected behaviour?  Perhaps it requires a firmware update? Any advice would help as this behaviour causes me to tend to dought my readings when using this meter.  Thanks in advance for any help you could provide.