By mechanical attenuator, I assume you mean one that you physically have to switch to change the level of attenuation. ?If so then changing frequency should have NO effect on attenuation, for that matter it shouldn¡¯t effect the electrically switched ones either. ?
What I suspect you are really seeing is a change in level to the attenuators from the output module(and/or others) as you change frequency. I¡¯d check the input to the attenuators for that problem instead.
I don¡¯t have a 8664 but my 8665 has an essentially constant output level that only varies a few dB electronically, the rest is a pair of attenuator that adjust in 5dB steps that work in conjunction with an ¡°AGC¡± like variable to give the output from the generator.?
Regards,
?
Stephen Hanselman
Datagate Systems, LLC
toggle quoted message
Show quoted text
On May 26, 2020, at 11:51, John Perlick <jperlick@...> wrote:
?Hey Amir why "above and below 375 MHz?"
My 8644A-002 (mechanical attenuator) has an issue where I change freq and the attenuation occasionally jumps around.? Do you know why this is?? I've checked and both attenuators seem to work fine when tested off the atten brd assy.? Any ideas??
