Hi guys
there are something wrong with my spectrum analyzer, its signal level is 30db lower then excepted.
for example I feed a 10MHz 0dbm into, it shows 10MHz -30dbm,like following picture.
![](http://bbs.38hot.net/data/attachment/forum/201711/08/231516neeluhzcstocodld.jpg.thumb.jpg)
![](http://bbs.38hot.net/data/attachment/forum/201711/08/231521i5baj8bdppbi8pka.jpg.thumb.jpg)
and when try to calibrate ifself, it shows an error with ERROR 654,TO LOW INPUT, like this.
![](http://bbs.38hot.net/data/attachment/forum/201711/08/230414ugp8vw18m2r22mkm.jpg.thumb.jpg)
is there anyone have same suggestion?
or where can I get service guide of the module. there is noting help on keysight website.