Hi Jarmo,
maybe you have one cell stuck, due to magnetization of the small actuator... Can be locked to the ceiling of attenuator case.
This appened to a good friend of mine, Art iw7jwy.
So the 20 dB cell is always on. Try to do a calibration of S.A.
If it fails, open and check the small 20 dB relay actuator.
A simple repair is to glue a mall tab of mylar inside, on the roof of attenuator, over the sluggish relay actuator.
HTH, Piero.
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--- In hp_agilent_equipment@..., "Jarmo" <jarmoblo@...> wrote:
Thanks a lot of this.
I just managed to get a 8568B that attenuator has some problems with the 20dB step.
These instructions encourage me to open the attenuator and clean the pads with isopropyl alcohol. Now it works fine.
I didn't made a testped for it i just cold moved carefully the solenoids and checked with dg8saq vnwa the attenuator pads. I'm not sure is the solenoid stuck or is it actually a contact failure.
The instructions how to disaasemble the attenuator was very accurate and easy to follow.
BR, Jarmo
