CRT hameg 203

[Aspro]

Bonjour a tous !
Je possède un oscilloscope hameg 203 , seulement j'aimerait l'équiper d'une sortie Z, comme de pouvoir connaître la valeur du condensateur entre la cathode et D1 . Tout se indiquer sur la page 7
https://ia800208.us.archive.org/16/items/hameg_HM203/HM203.pdf
Cordialement

[carl_lab]

"wired cap"? parasitic cap or piece of koax or twisted pair cable?
what function does that cap has? it couples z-amplifier to horizontal deflection...
flyback blanking? isn't that the function of the optocoupler?

can you post photos of that capacitor?
why do you want to know the value?

[tronde]

I understand him so  that he want to install the optional Z-input.
The schematics indicates that 1N4149, 100k, 33pF, 10nF/3kV and 1M is part of this input in addition to the "wired capacitor".

I attach part of the schematics for HM203-5 showing the same circuit. The "wired capacitor" is not present there so I guess it is not important for the function, but they show an extra TTL Z-input in addition that might be useful.

[Aspro]

Bonjour
je ne possède pas de photo de se condensateur, par contre" tronde" a raison !!Sur le faite que je cherche a rajouter une entrée Z en option....De plus wired cap en Français signifie ( Chapeau câblé??)
Cdl

[carl_lab]

I sent your postings to google translator:

I have an oscilloscope hameg 203, only I would like to equip it with an output Z, as to be able to know the value of the capacitor between the cathode and D1. Everything on page 7

I do not have a photo of capacitor, by cons "tronde" is right !! On the fact that I am looking to add an entry Z in option .... Also wired cap in French means (Hat wired ??)

 

The schematics indicates that 1N4149, 100k, 33pF, 10nF/3kV and 1M is part of this input in addition to the "wired capacitor".

First I would try without the "wired cap".
I'm quite sure it will work without.