fluke 8808a - Page 1
Forum section: electronics / repair

author: duteletronica
author_rank: Newbie
timestamp: October 21, 2024, 10:05:06 pm
content: Hello, I have a Fluke 8808a that was always measuring continuities with the beeping sound. After analyzing it, I came to the conclusion that it is the components E1 and E2 and I don't know what components they are? Can anyone help me find out the reference.

author: duteletronica
author_rank: Newbie
timestamp: October 22, 2024, 02:18:48 pm
content: please can someone help me???

author: Swainster
author_rank: Frequent Contributor
timestamp: October 23, 2024, 03:41:19 am
content: Post a picture

author: duteletronica
author_rank: Newbie
timestamp: October 23, 2024, 08:48:48 am
content: Hi, here is the image. thanks

author: picburner
author_rank: Frequent Contributor
timestamp: October 23, 2024, 09:08:54 am
content: They are part of the instrument's protection circuit, probably objects likethese.

author: picburner
author_rank: Frequent Contributor
timestamp: October 23, 2024, 09:31:17 am
content: .... andhereyou can find some more clues.In another user's instrument (although different in appearance) they are marked TAIYO AG20

author: duteletronica
author_rank: Newbie
timestamp: October 23, 2024, 09:40:52 am
content: Thank you, but is that the correct value??

author: picburner
author_rank: Frequent Contributor
timestamp: October 23, 2024, 10:12:18 am
content: In the last link I posted the user GAD says this, I don't have this dmm so I can't confirm.

author: Swainster
author_rank: Frequent Contributor
timestamp: October 25, 2024, 03:59:42 am
content: Just to be clear, spark gaps should read open circuit when doing a resistance or continuity test. You will probably need to pop out a leg to test them properly (just in case something else is in parallel with them). I don't think I've ever seen a failed spark gap without other obvious damage (burnt tracks etc).Anyway, if you are sure that it is these parts that are faulty, then going by the red - black - red stripes, BK12010002 looks like it might be a suitable replacement.

author: picburner
author_rank: Frequent Contributor
timestamp: October 25, 2024, 04:32:25 am
content: One difference between SK20 and BK12010002 is that the first has a minimum insulation resistance of 10GOhm while the second has 100MOhm (if the datasheet of the latter is not wrong......).For a dmm that on the 200mV/2V ranges has an input impedance > 10GOhm this can be an important difference.

author: Swainster
author_rank: Frequent Contributor
timestamp: October 25, 2024, 06:48:01 am
content: Good point. I was just going by the appearance. Interesting that the plastic encapsulated part has better leakage characteristics than the glass one. Sadly I lost my old lab/workshop so my Keithley 237 has gone into storage, otherwise I could have tried to measure it. I think I have some old GDTs and SPGs left over from when I worked in the land line telephone business.

author: picburner
author_rank: Frequent Contributor
timestamp: October 25, 2024, 08:02:26 am
content: Yes, I too would have expected a better device with glass insulation.Looking more closely at the photo posted by the OP in the fourth post, only now I notice that the spark gaps do not seem to be factory mounted but would seem to be a subsequent repair, especially E2 gives me this impression.

author: duteletronica
author_rank: Newbie
timestamp: January 03, 2025, 12:51:13 pm
content: I thank you in advance for your help, it seems to have been repaired but the photo was only taken after unsoldering, I have difficulty in getting the component but I keep trying. Thank you