Troubleshooting a Heath im-5228 VTVM

[Jack Crenshaw]

I presume you've checked the tubes, right?  What you describe sounds like
one side of the
bridge isn't producing.

Another thought:  There's an adjustment pot inside the case; three of them,
in fact.  The one I
have in mind is called, as I recall, DC BAL.

When the meter is operating properly and warmed up, you should be able to
switch it off, zero
the meter (by adjusting the mechanical zero screw) and then turn it back on
again, without having
the meter move after the initial transient.

If DC BAL is set properly, you should be able to switch from DC+ to DC- to
AC, and still not
have the needle move.

One thing I've encountered in a few meters is that someone has tried to
compensate for poor
alignment by diddling with the mechanical zero. You might check that first.
Then check DC BAL.

Jack



----- Original Message -----
From: Tom Bridgers <tarheel6 at EMAIL.MSN.COM>
To: <HEATH at LISTSERV.TEMPE.GOV>
Sent: Monday, July 30, 2001 1:00 PM
Subject: Troubleshooting a Heath im-5228 VTVM


> Good morning!
>
> When I turn on my VTVM -- from off to AC, the needle goes to the extreme
> right and stays.  When I switch to DC-, same thing.  When I switch to DC+,
> the needle goes to the extreme left.  On ohms, it hangs to the left.  So
...
> I can't read any voltages or resistance at all.
>
> I've done some trouble shooting and all the components are within spec.
> I've hit the wall on this one...  I sure would appreciate some help ...
> anyone got any ideas on curing this condition?
>
> thanks in advance,
> -tom  KE4RHH
>
> Listserver Subscription:listserv at listserv.tempe.gov - "subscribe heath
'name' 'call'"
> Listserver Submissions: heath at listserv.tempe.gov
> Listserver Unsubscribe: listserv at listserv.tempe.gov - -"signoff heath"

Listserver Subscription:listserv at listserv.tempe.gov - "subscribe heath 'name' 'call'"
Listserver Submissions: heath at listserv.tempe.gov
Listserver Unsubscribe: listserv at listserv.tempe.gov - -"signoff heath"