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Re: HP 478A Thermistor head

 

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How much goes down ? Did you sweep the sensor ? The input reflection coefficient is good tho check it.?

Ing. Patricio A. Greco
Taller Aeronáutico de Reparación 1B-349
Organización de Mantenimiento Aeronáutico de la Defensa OMAD-001
Gral. Martín Rodríguez 2159
San Miguel (1663)
Buenos Aires
T:?+5411-4455-2557
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On 27 Feb 2023, at 11:24, Kenneth Harrison <bibpakak507@...> wrote:

?
Low end roll could be connector or bellows cap, guessing the later, but remote diagnostic is asking for trouble. Willing to help

On Mon, Feb 27, 2023, 7:43 AM Paul Bicknell <admin@...> wrote:

?

Hi? I have a HP 478A Thermistor head that works OK above 2 Ghz but reads low below 2 Ghz

I assume there is a problem with the internal series capacitor

Has anyone had a similar fault and is there any advice on a repair

?

Regards Paul


--
Ken H.

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