Hello, I bought a refurbished Advantest 26.5GHz spectrum analyzer R3273A that was nicely working for a year, then it suddenly showed a fault in the IF board. The displayed signal level drops around 30dB when RBW is set between 100KHz and 3KHz, then returning at correct level at RBW of 1KHz and narrower or at 300KHz and wider.
I have no schematics but I guess the specific amplifier is probably faulty, maybe simply a leaking capacitor or something like that.
Can anyone help with schematics for any similar Advantest spectrum analyzer R327x?
Many thanks,
Andy