Products > Test Equipment
Amazon Do Multimeters Now
Kosmic:
--- Quote from: EEVblog on March 25, 2023, 09:40:13 pm ---Why is there glue on the protection diodes?
--- End quote ---
Cheap corona dope substitute ?
JOSM:
--- Quote from: Kosmic on October 19, 2022, 02:30:59 am ---Small detail about the 90DM890, the Bluethooth module is missing and the option is not in the setup menu. So, there's no way to connect to meter to phone or PC.
--- End quote ---
To compare against my RND 355-00010 (also a CEM DT-989 twin):
Kosmic:
--- Quote from: JOSM on April 04, 2023, 06:47:27 am ---
--- Quote from: Kosmic on October 19, 2022, 02:30:59 am ---Small detail about the 90DM890, the Bluethooth module is missing and the option is not in the setup menu. So, there's no way to connect to meter to phone or PC.
--- End quote ---
To compare against my RND 355-00010 (also a CEM DT-989 twin):
--- End quote ---
I wonder if this one is made by CEM too. The board is somewhat similar but clearly not the same. Can't find any reference to DT-9589. Maybe a clone ?
Kosmic:
Talking about the Amazon 90DM890 (CEM DT-989), if someone is looking for the password for the calibration menu and calibration procedures, poke me. I was able to get my hands on everything.
Kleinstein:
--- Quote from: EEVblog on March 25, 2023, 09:40:13 pm ---
--- Quote from: Kosmic on October 19, 2022, 02:30:59 am ---Small detail about the 90DM890, the Bluethooth module is missing and the option is not in the setup menu. So, there's no way to connect to meter to phone or PC.
--- End quote ---
Why is there glue on the protection diodes?
--- End quote ---
The diodes look like the clamping diodes for the current ranges. With overcurrent these diodes can run quite hot - worst case this may be enough to unsolder them, which would be bad. They are supposed to fail (if at all) short, not open. The glue may be there to keep the diodes in place even of the solder gets soft. The part where the glue is applied is a connection anyway. So it would not be so bad as the glue later on turns a bit conductive when old.
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version