The drive voltage is nominal under load.
Are you suggesting I compare the coil resistance to a known good device? By what mechanism would the coil resistance increase - metal fatigue?
Fred
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--- In hp_agilent_equipment@..., Bob Albert <bob91343@...> wrote:
Measure the coil resistance and drive voltage.? It may be that the drive is weak and it's not getting enough coil current, either due to coil resistance increase or drive signal decrease.
Bob
--- On Fri, 12/28/12, ffierling <fff@...> wrote:
From: ffierling <fff@...>
Subject: [hp_agilent_equipment] Re: DIY: Repair of HP Step Attenuators
To: hp_agilent_equipment@...
Date: Friday, December 28, 2012, 2:56 PM
All,
I wonder: I have a sticky microwave relay in an HP 8593A. If the relay has been closed (ie for LOWBAND) for about five minutes and is opened, it won't close again unless it's had a chance to cool down (about 10 minutes at room temp). I can get it to close immediately with freeze-spray. Could this possibly be magnetization? Aside from a sticky relay pivot, how else can such relays fail?
Fred
--- In hp_agilent_equipment@..., "i5spo" <piero.soldi@> wrote:
maybe you have one cell stuck, due to magnetization of the small actuator... Can be locked to the ceiling of attenuator case.
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