[SI-LIST] Re: Help me
- From: <stubenner@xxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Mon, 6 Feb 2006 14:56:56 -0500
Virtually all modern ohmmeters use a current source to drive the device
under test (DUT). The current used varies between scales. The voltage
compliance of the meters is not necessarily the same as the battery =
voltage.
Please read the instrument specifications. When measuring semiconductor
junctions with an ohmmeter, the voltage developed (i.e., resistance) =
across
a DUT will vary with the applied current, therefore, a different =
reading
will be indicated depending on the scale (current source value) used. =
That
is one of my reasons for the disdain of auto-scaling meters. Such
"resistance" measurements are sometimes useful for gross checks (be sure =
to
understand what you're trying to measure) and for comparing DUT's for
in/out-of-family behavior - just be sure to use the same source current =
each
time.
Stu Benner
stubenner@xxxxxxxx
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] =
On
Behalf Of sunil.mekad@xxxxxxxxx
Sent: Monday, February 06, 2006 2:26 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Help me
Hi,
I have a different question. Is it a good idea to use a multimeter (12V) =
to
check shorts for low voltage devices? The applied voltage could damage =
these
CMOS devices permanently especially the low voltages!
I usually put the multimeter in high resistance mode and check the
resistance. I don't know if that too is correct way to go. Does anyone =
have
any other easy solution?
Regards
sunil
________________________________
From: si-list-bounce@xxxxxxxxxxxxx on behalf of Andrew Ingraham
Sent: Sat 2/4/2006 9:00 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: help me
> The common multi-meter is of 12V. Is there any multi-meter of other
voltage?
Yes.
Not only will the multimeter with the 12 V battery probably apply a much
smaller voltage when measuring resistance, but not every DVM uses 12 V =
for
power. My pocket one uses 3 V.
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