Forums :: Resources :: Features :: Photo Gallery :: Vintage Radio Shows :: Archives :: Books
Support This Site: Contributors :: Advertise


It is currently Oct Mon 22, 2018 1:16 am


All times are UTC [ DST ]





Post New Topic Post Reply  [ 4 posts ] 
Author Message
 Post subject: micronta vom,22-203a thru u
PostPosted: Jan Sat 20, 2018 9:12 pm 
New Member

Joined: Nov Wed 02, 2016 3:47 pm
Posts: 8
Hi All
Does anyone know why so many of the micronta 22-203 series voms all suffer the same damage character characteristics? Smoking one particular resistor on the pc board. I am puzzled by this and I am a ham operator of 50 + years w3kfq
Bobby


Top
 Profile  
 
 Post subject: Re: micronta vom,22-203a thru u
PostPosted: Jan Sat 20, 2018 11:03 pm 
Member
User avatar

Joined: May Wed 18, 2011 2:40 am
Posts: 3534
Location: Littleton, MA
robert0415 wrote:
Smoking one particular resistor on the pc board.

Which resistor? R15?

It's probably from putting the VOM across 117 VAC when it is set for ohms.

_________________
Steve Byan http://www.byan-roper.org/steve/steve-at-play/


Top
 Profile  
 
 Post subject: Re: micronta vom,22-203a thru u
PostPosted: Feb Fri 09, 2018 4:43 am 
Member
User avatar

Joined: Aug Sat 27, 2011 1:59 am
Posts: 94
Location: Kansas City area
That's exactly what happened to a Micronta 22-203 I owned back in the mid 80's. I took it in to the office one day to check something. This "kid" (I could call him a kid) sees it laying on my desk, says, "Cool!", grabs it and sticks the probes into a wall outlet.

Unfortunately, it was set to "ohms" at the time. The thing goes "POP" and a puff of smoke came out of it! I was pissed! :x


Top
 Profile  
 
 Post subject: Re: micronta vom,22-203a thru u
PostPosted: Feb Fri 09, 2018 1:00 pm 
Member
User avatar

Joined: May Mon 18, 2009 5:55 pm
Posts: 2859
Location: Erie, PA
Exactly what stevebyan said- I think we all experienced this with those R/S meters at least once. That resistor ends up acting as a "fuse" when high enough voltages are applied to the meter accidentally when in a resistance range.

-Mark-


Top
 Profile  
 
Post New Topic Post Reply  [ 4 posts ] 

All times are UTC [ DST ]


Who is online

Users browsing this forum: Cubdriver, philconerd and 9 guests



Search for:
Jump to:  
























Privacy Policy :: Powered by phpBB