anritsu spectrum analyzer ms2601a
Hi and thanx for the SM!
Have a MS2601A spec that dosen't work.. Have download the service manual and start to fault finding but I will trye to se if i can get some advice what i could be the "topic". If i connect the 50MHz output on the back to the input and set Fq to 50MHz and span to 200MHz i will get a normal "top" that is not locked, its flying around and if decreace the span (100KHz) the top will disappear.. One more thing is if i set Fq 0MHz, Span 0MHz and no input i will get a noice floor with sudden rise (like a mesuring a "1" TTL level with a oscilloscope) and back to the noice floor..
Both PLL LEDs Q44 and Q10 are off = locking, page 3-51.