Re: Question regarding the identification of a component

From	Reinhard Zwirner <reinhard.zwirner@t-online.de>
Newsgroups	sci.electronics.components
Subject	Re: Question regarding the identification of a component
Date	2025-09-10 19:06 +0200
Message-ID	<midpgfFi8hgU1@mid.individual.net> (permalink)
References	(1 earlier) <68c0533e$4$10368$882e4bbb@reader.netnews.com> <mibg15F6fc5U1@mid.individual.net> <mid1h5FducsU2@mid.individual.net> <midkbhFhdokU1@mid.individual.net> <midkllFgdbkU1@mid.individual.net>

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chrisnd@privacy.net schrieb:
> On 10/09/2025 16:38, Reinhard Zwirner wrote:
>> chrisnd@privacy.net schrieb:
>>> On 09/09/2025 21:12, Reinhard Zwirner wrote:
>>>> bitrex schrieb:
>>>>> On 9/9/2025 8:38 AM, Reinhard Zwirner wrote:
>>>>>> Attention: fup2!
>>>>>>
>>>>>> Hello,
>>>>>>
>>>>>> In an older power supply unit for GM counter tubes, the high
>>>>>> voltage
>>>>>> (max. 1 kV) is generated by a normal push-pull voltage converter
>>>>>> (switching frequency approx. 8 kHz). In the HV filter chain, this
>>>>>>
>>>>>> <https://s1.directupload.eu/images/250908/bsg2w6z7.jpg>
>>>>>>
>>>>>> capacitor is connected in parallel with the following strangely
>>>>>> marked component of the same size,
>>>>>>
>>>>>> <https://s1.directupload.eu/images/250908/62iwvu9p.jpg>
>>>>>>
>>>>>> which my Far Eastern multitester identifies as an 8 nF capacitor.
>>>>>> That could well be the case, but why the strange marking? A VDR?
>>>>>> What
>>>>>> do you think?
>>>>>>
>>>>>> Many thanks in advance for your hints.
>>>>>>
>>>>>> Best regards
>>>>>>
>>>>>> Reinhard
>>>>>
>>>>> Maybe "41C" indicates the transition temperature for a PTC?
>>>>
>>>> The part behaves in no way as sort of resistor.
>>>
>>> Unless it has failed, open-circuit?
>>
>> Yes and no. Multitester says: 7,8 nF capacitor. But a capacitor
>> should just be open circuit, otherwise it's broken. On the other hand
>> I doubt that a PTC/NTC is connected to ground and a 1 kV line.
> 
> Sorry, I was still in VDR territory when suggesting open circuit.

Don't worry! I just referred to the above mentioned PTC.

I just tested a S20K300 varistor manufactured by EPCOS in series with
a 33 k resistor: limiting startet at approx. 420 V, max. voltage
across this varistor was about 460 V. (Multitester said: 820 pF
capacitor ...). So I think an "open circuit" test result doesn't
prove a 3 kV varistor is broken: my test voltage is limited to "only"
3 kV ...

Regards

Reinhard

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Thread

Question regarding the identification of a component Reinhard Zwirner <reinhard.zwirner@t-online.de> - 2025-09-09 14:38 +0200
  Re: Question regarding the identification of a component "Edward Rawde" <invalid@invalid.invalid> - 2025-09-09 12:01 -0400
    Re: Question regarding the identification of a component Reinhard Zwirner <reinhard.zwirner@t-online.de> - 2025-09-09 22:08 +0200
  Re: Question regarding the identification of a component Klaus Kragelund <klauskvik@hotmail.com> - 2025-09-09 18:19 +0200
    Re: Question regarding the identification of a component Reinhard Zwirner <reinhard.zwirner@t-online.de> - 2025-09-09 22:15 +0200
  Re: Question regarding the identification of a component Klaus Kragelund <klauskvik@hotmail.com> - 2025-09-09 18:24 +0200
    Re: Question regarding the identification of a component Reinhard Zwirner <reinhard.zwirner@t-online.de> - 2025-09-09 22:17 +0200
  Re: Question regarding the identification of a component bitrex <user@example.net> - 2025-09-09 12:19 -0400
    Re: Question regarding the identification of a component Reinhard Zwirner <reinhard.zwirner@t-online.de> - 2025-09-09 22:12 +0200
      Re: Question regarding the identification of a component "chrisnd@privacy.net" <chrisnd@privacy.net> - 2025-09-10 11:17 +0100
        Re: Question regarding the identification of a component Reinhard Zwirner <reinhard.zwirner@t-online.de> - 2025-09-10 17:38 +0200
          Re: Question regarding the identification of a component "chrisnd@privacy.net" <chrisnd@privacy.net> - 2025-09-10 16:43 +0100
            Re: Question regarding the identification of a component Reinhard Zwirner <reinhard.zwirner@t-online.de> - 2025-09-10 19:06 +0200
  Re: Question regarding the identification of a component Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2025-09-09 17:00 +0000
    Re: Question regarding the identification of a component John R Walliker <jrwalliker@gmail.com> - 2025-09-09 18:57 +0100
      Re: Question regarding the identification of a component Reinhard Zwirner <reinhard.zwirner@t-online.de> - 2025-09-09 21:56 +0200
  Re: Question regarding the identification of a component legg <legg@nospam.magma.ca> - 2025-09-12 08:32 -0400
    Re: Question regarding the identification of a component Reinhard Zwirner <reinhard.zwirner@t-online.de> - 2025-09-13 22:13 +0200
  Re: Question regarding the identification of a component legg <legg@nospam.magma.ca> - 2025-09-12 08:52 -0400
  Re: Question regarding the identification of a component legg <legg@nospam.magma.ca> - 2025-09-12 09:09 -0400
    Re: Question regarding the identification of a component legg <legg@nospam.magma.ca> - 2025-09-13 13:09 -0400
      Re: Question regarding the identification of a component Theo <theom+news@chiark.greenend.org.uk> - 2026-03-01 18:17 +0000
        Re: Question regarding the identification of a component Reinhard Zwirner <reinhard.zwirner@t-online.de> - 2026-03-02 19:36 +0100
          Re: Question regarding the identification of a component Theo <theom+news@chiark.greenend.org.uk> - 2026-03-04 13:04 +0000

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