Yahoo Groups archive

Vintage Synth Repair

Index last updated: 2026-04-28 23:41 UTC

Thread

decent meter for negative voltages

decent meter for negative voltages

2004-09-12 by dizz662000

Hi, I'm new to the group. Working on a Korg Polysix. I need a decent
multimeter for checking the filter cutoff voltage pot. It's -5V to
+5V. I've tried to research some Fluke meters but they don't discuss
negative voltages in the docs. An EE friend suggested a decent digital
type should work but he didn't have any specifics-(ASICs designer).
Can anyone tell me if a Fluke model 175 has this capability? Or any
other model for $200. USD or less.

many thanks,

dizz

Re: [vintagesynthrepair] decent meter for negative voltages

2004-09-12 by John Brewer

I'm not sure what method you have to use to set up. If you have an ordinary
meter, can't you just put the -ve of the meter on the -5 point and the + on
the 0v line to measure the -5 and then move the probe to the +5 point where
it will then read 10v. or have I misunderstood your problem.  I use a Fluke
75 iii multimeter which is excellent and will measure + and - without
changing the leads over. It just flags up a minus sign in front of the
reading.  I am not sure of the price but I think it came from Farnell.(sorry
about the plug.)
John
Show quoted textHide quoted text
----- Original Message -----
From: dizz662000 <dizz@...>
To: <vintagesynthrepair@yahoogroups.com>
Sent: Sunday, September 12, 2004 7:45 PM
Subject: [vintagesynthrepair] decent meter for negative voltages


> Hi, I'm new to the group. Working on a Korg Polysix. I need a decent
> multimeter for checking the filter cutoff voltage pot. It's -5V to
> +5V. I've tried to research some Fluke meters but they don't discuss
> negative voltages in the docs. An EE friend suggested a decent digital
> type should work but he didn't have any specifics-(ASICs designer).
> Can anyone tell me if a Fluke model 175 has this capability? Or any
> other model for $200. USD or less.
>
> many thanks,
>
> dizz
>
>
>
>
>
> Yahoo! Groups Links
>
>
>
>
>


---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.744 / Virus Database: 496 - Release Date: 8/24/04

RE: [vintagesynthrepair] decent meter for negative voltages

2004-09-13 by timothy kosiorek

Hello:all you need to do to measure negative voltages is reverse the test 
leads,most digital voltmeters have a + or - sign before the reading to let 
you know if it is a positive or negative voltage you are reading without 
having to reverse the test leads,a Fluke meter should be good enough to read 
the voltages,I don't think fluke makes anything but good meters,but get one 
that has at least 3-1/2 digits.preferably 4-1/2 digits if you plan on doing 
a lot of synth adjustments.
reagrds,
Tim K.



direct link to my Ebay store.
www.sonicelectronicmusic.com
Show quoted textHide quoted text
>From: "dizz662000" <dizz@...>
>Reply-To: vintagesynthrepair@yahoogroups.com
>To: vintagesynthrepair@yahoogroups.com
>Subject: [vintagesynthrepair] decent meter for negative voltages
>Date: Sun, 12 Sep 2004 18:45:28 -0000
>
>Hi, I'm new to the group. Working on a Korg Polysix. I need a decent
>multimeter for checking the filter cutoff voltage pot. It's -5V to
>+5V. I've tried to research some Fluke meters but they don't discuss
>negative voltages in the docs. An EE friend suggested a decent digital
>type should work but he didn't have any specifics-(ASICs designer).
>Can anyone tell me if a Fluke model 175 has this capability? Or any
>other model for $200. USD or less.
>
>many thanks,
>
>dizz
>
>
>
>
>
>Yahoo! Groups Links
>
>
>
>
>

Re: [vintagesynthrepair] decent meter for negative voltages

2004-09-14 by dizz@elitemofo.com

Quoting John Brewer <john@...>:

Thanks for replying John,

  My reply to Tim K is more explanitory (nothing personal!) I did get a Fluke
DMM so I wouldn't need to switch leads etc,,,

regards,

dizz
Show quoted textHide quoted text
> I'm not sure what method you have to use to set up. If you have an ordinary
> meter, can't you just put the -ve of the meter on the -5 point and the + on
> the 0v line to measure the -5 and then move the probe to the +5 point where
> it will then read 10v. or have I misunderstood your problem.  I use a Fluke
> 75 iii multimeter which is excellent and will measure + and - without
> changing the leads over. It just flags up a minus sign in front of the
> reading.  I am not sure of the price but I think it came from Farnell.(sorry
> about the plug.)
> John
> ----- Original Message -----
> From: dizz662000 <dizz@...>
> To: <vintagesynthrepair@yahoogroups.com>
> Sent: Sunday, September 12, 2004 7:45 PM
> Subject: [vintagesynthrepair] decent meter for negative voltages
>
>
> > Hi, I'm new to the group. Working on a Korg Polysix. I need a decent
> > multimeter for checking the filter cutoff voltage pot. It's -5V to
> > +5V. I've tried to research some Fluke meters but they don't discuss
> > negative voltages in the docs. An EE friend suggested a decent digital
> > type should work but he didn't have any specifics-(ASICs designer).
> > Can anyone tell me if a Fluke model 175 has this capability? Or any
> > other model for $200. USD or less.
> >
> > many thanks,
> >
> > dizz
> >
> >
> >
> >
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
>
>
> ---
> Outgoing mail is certified Virus Free.
> Checked by AVG anti-virus system (http://www.grisoft.com).
> Version: 6.0.744 / Virus Database: 496 - Release Date: 8/24/04
>
>
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
>

RE: [vintagesynthrepair] decent meter for negative voltages

2004-09-14 by dizz@elitemofo.com

Hmmm,

  Thought I replied but don't see anything. Thanks for the advice Tim and I did
get a decent Fluke (175). I've repled back to Crow over at the polysix group,
If you're interested in what I'm working on,,,(vcf cutoff quirkiness)

regards,

dizz

Quoting timothy kosiorek <tkosiorek@...>:
Show quoted textHide quoted text
> Hello:all you need to do to measure negative voltages is reverse the test
> leads,most digital voltmeters have a + or - sign before the reading to let
> you know if it is a positive or negative voltage you are reading without
> having to reverse the test leads,a Fluke meter should be good enough to read
> the voltages,I don't think fluke makes anything but good meters,but get one
> that has at least 3-1/2 digits.preferably 4-1/2 digits if you plan on doing
> a lot of synth adjustments.
> reagrds,
> Tim K.
>
>
>
> direct link to my Ebay store.
> www.sonicelectronicmusic.com
>
>
>
>
>
> >From: "dizz662000" <dizz@...>
> >Reply-To: vintagesynthrepair@yahoogroups.com
> >To: vintagesynthrepair@yahoogroups.com
> >Subject: [vintagesynthrepair] decent meter for negative voltages
> >Date: Sun, 12 Sep 2004 18:45:28 -0000
> >
> >Hi, I'm new to the group. Working on a Korg Polysix. I need a decent
> >multimeter for checking the filter cutoff voltage pot. It's -5V to
> >+5V. I've tried to research some Fluke meters but they don't discuss
> >negative voltages in the docs. An EE friend suggested a decent digital
> >type should work but he didn't have any specifics-(ASICs designer).
> >Can anyone tell me if a Fluke model 175 has this capability? Or any
> >other model for $200. USD or less.
> >
> >many thanks,
> >
> >dizz
> >
> >
> >
> >
> >
> >Yahoo! Groups Links
> >
> >
> >
> >
> >
>
>
>
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
>

Re: decent meter for negative voltages

2004-09-15 by deknoww

digital meters are very useful...but a cheap ($10) analog meter is 
invaluble (you cannot see small fluctuations with a digital 
meter..but an analog meter you can see the needle vibrating).  i love 
my "fancy" digital meter, but it certainly isn't necessary to spend 
more than $20.

deknow

--- In vintagesynthrepair@yahoogroups.com, dizz@e... wrote:
> Quoting John Brewer <john@j...>:
> 
> Thanks for replying John,
> 
>   My reply to Tim K is more explanitory (nothing personal!) I did 
get a Fluke
> DMM so I wouldn't need to switch leads etc,,,
> 
> regards,
> 
> dizz
> 
> > I'm not sure what method you have to use to set up. If you have 
an ordinary
> > meter, can't you just put the -ve of the meter on the -5 point 
and the + on
> > the 0v line to measure the -5 and then move the probe to the +5 
point where
> > it will then read 10v. or have I misunderstood your problem.  I 
use a Fluke
> > 75 iii multimeter which is excellent and will measure + and - 
without
> > changing the leads over. It just flags up a minus sign in front 
of the
> > reading.  I am not sure of the price but I think it came from 
Farnell.(sorry
> > about the plug.)
> > John
> > ----- Original Message -----
> > From: dizz662000 <dizz@e...>
> > To: <vintagesynthrepair@yahoogroups.com>
> > Sent: Sunday, September 12, 2004 7:45 PM
> > Subject: [vintagesynthrepair] decent meter for negative voltages
> >
> >
> > > Hi, I'm new to the group. Working on a Korg Polysix. I need a 
decent
> > > multimeter for checking the filter cutoff voltage pot. It's -5V 
to
> > > +5V. I've tried to research some Fluke meters but they don't 
discuss
> > > negative voltages in the docs. An EE friend suggested a decent 
digital
> > > type should work but he didn't have any specifics-(ASICs 
designer).
> > > Can anyone tell me if a Fluke model 175 has this capability? Or 
any
Show quoted textHide quoted text
> > > other model for $200. USD or less.
> > >
> > > many thanks,
> > >
> > > dizz
> > >
> > >
> > >
> > >
> > >
> > > Yahoo! Groups Links
> > >
> > >
> > >
> > >
> > >
> >
> >
> > ---
> > Outgoing mail is certified Virus Free.
> > Checked by AVG anti-virus system (http://www.grisoft.com).
> > Version: 6.0.744 / Virus Database: 496 - Release Date: 8/24/04
> >
> >
> >
> >
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
> >

Move to quarantaine

This moves the raw source file on disk only. The archive index is not changed automatically, so you still need to run a manual refresh afterward.