Help reading 5-band resistor?

[Readily Visible]

I have a resistor in an analog VOM meter that I suspect is bad. It is
exclusive to the 1x ohm scale, which is now reading as if it were the
1000x ohm scale.

The color bands are as follows:

Red
Grey
Violet
Gold
Red

There is a larger space between the gold and red bands than between any
other adjacent bands.

.... and it is of this type:
http://upload.wikimedia.org/wikipedia/commons/e/e3/3_Resistors.jpg

I read this as 280,000,000 ohms with 5% tolerance and 50 ppm temperature
coefficient, but when I use a digital meter to read the resistance it
comes in at 270,000 ohms.

I noticed a small hairline crack in this resistor and when I poked it
with a pin a small flake of the outer coating fell off.

280,000,000 ohms seems like an awfully large value to me. Could this be
a correct reading?

Thanks

 

[Rich Webb]

On Sun, 24 May 2009 10:41:43 -0700, Readily Visible
<Readily_Visible@xyz.com> wrote:

I have a resistor in an analog VOM meter that I suspect is bad. It is
exclusive to the 1x ohm scale, which is now reading as if it were the
1000x ohm scale.

The color bands are as follows:

Red
Grey
Violet
Gold
Red

287 / 10 (e.g. 28.7) at 2% tolerance.

--
Rich Webb Norfolk, VA

 

[Readily Visible]

Rich Webb wrote:

On Sun, 24 May 2009 10:41:43 -0700, Readily Visible
Readily_Visible@xyz.com> wrote:

I have a resistor in an analog VOM meter that I suspect is bad. It is
exclusive to the 1x ohm scale, which is now reading as if it were the
1000x ohm scale.

The color bands are as follows:

Red
Grey
Violet
Gold
Red

287 / 10 (e.g. 28.7) at 2% tolerance.

I figured that was probably closer to reality so I salvaged up a 100 ohm
and a 39 ohm resistor and put them in parallel to get 28 ohms and the 1x
ohms scale is reading close to normal.

Thanks!

 

[Geoffrey S. Mendelson]

Readily Visible wrote:

I have a resistor in an analog VOM meter that I suspect is bad. It is
exclusive to the 1x ohm scale, which is now reading as if it were the
1000x ohm scale.

The color bands are as follows:

Red 2
Grey 8
Violet 7
Gold 5%
Red ? (I never learned this)

The trick I learned was bad(black 0 boys (brown 1), rape (red 2) our (orange 3),
young (yellow 4), girls (green 5), but (blue 6), Violet (7) gives (grey 8),
willingly (white 9).

For the tolerance bands get (gold 5%) some (silver 10%), now (none 20%).

This was long before political correctness existed and the few women in
engineering had to "just live with it".

There is a larger space between the gold and red bands than between any
other adjacent bands.

So that's 28 followed by 7 zeros, or 280,000,000.


Here's a good description

http://wiki.xtronics.com/index.php/Resistor_Codes

and here's a website that decodes them for you.

http://www.dannyg.com/examples/res2/resistor.htm

Poor me, I had to use a little cardboard thing.

I read this as 280,000,000 ohms with 5% tolerance and 50 ppm temperature
coefficient, but when I use a digital meter to read the resistance it
comes in at 270,000 ohms.

I noticed a small hairline crack in this resistor and when I poked it
with a pin a small flake of the outer coating fell off.

280,000,000 ohms seems like an awfully large value to me. Could this be
a correct reading?

Either you meter is way off, you are reading it wrongly, or the resistor
has really changed with age. 280m ohms is just about right.

Geoff.

--
Geoffrey S. Mendelson, Jerusalem, Israel gsm@mendelson.com N3OWJ/4X1GM

 

[Geoffrey S. Mendelson]

Readily Visible wrote:

Rich Webb wrote:
On Sun, 24 May 2009 10:41:43 -0700, Readily Visible
Readily_Visible@xyz.com> wrote:

I have a resistor in an analog VOM meter that I suspect is bad. It is
exclusive to the 1x ohm scale, which is now reading as if it were the
1000x ohm scale.

The color bands are as follows:

Red
Grey
Violet
Gold
Red

287 / 10 (e.g. 28.7) at 2% tolerance.

I figured that was probably closer to reality so I salvaged up a 100 ohm
and a 39 ohm resistor and put them in parallel to get 28 ohms and the 1x
ohms scale is reading close to normal.

It seems the 5 and 6 band codes are different than the 4.


Here's a correct caclculator:

http://samengstrom.com/nxl/2020/6_band_resistor_color_code_page.en.html

Geoff.
--
Geoffrey S. Mendelson, Jerusalem, Israel gsm@mendelson.com N3OWJ/4X1GM

 

[Rich Webb]

On Sun, 24 May 2009 20:04:03 +0000 (UTC), "Geoffrey S. Mendelson"
<gsm@mendelson.com> wrote:

Readily Visible wrote:
Rich Webb wrote:
On Sun, 24 May 2009 10:41:43 -0700, Readily Visible
Readily_Visible@xyz.com> wrote:

I have a resistor in an analog VOM meter that I suspect is bad. It is
exclusive to the 1x ohm scale, which is now reading as if it were the
1000x ohm scale.

The color bands are as follows:

Red
Grey
Violet
Gold
Red

287 / 10 (e.g. 28.7) at 2% tolerance.

I figured that was probably closer to reality so I salvaged up a 100 ohm
and a 39 ohm resistor and put them in parallel to get 28 ohms and the 1x
ohms scale is reading close to normal.


It seems the 5 and 6 band codes are different than the 4.


Here's a correct caclculator:

http://samengstrom.com/nxl/2020/6_band_resistor_color_code_page.en.html

Or this free app from Schematica.
<http://www.schematica.com/resistor_color_codes/Resistor.htm>

I'm okay with the normal bands but always screw up the gold/silver
multipliers -- and the tolerance bands? Fuggedaboudit.

--
Rich Webb Norfolk, VA

 

[Readily Visible]

Geoffrey S. Mendelson wrote:

Readily Visible wrote:
Rich Webb wrote:
On Sun, 24 May 2009 10:41:43 -0700, Readily Visible
Readily_Visible@xyz.com> wrote:

I have a resistor in an analog VOM meter that I suspect is bad. It is
exclusive to the 1x ohm scale, which is now reading as if it were the
1000x ohm scale.

The color bands are as follows:

Red
Grey
Violet
Gold
Red
287 / 10 (e.g. 28.7) at 2% tolerance.
I figured that was probably closer to reality so I salvaged up a 100 ohm
and a 39 ohm resistor and put them in parallel to get 28 ohms and the 1x
ohms scale is reading close to normal.


It seems the 5 and 6 band codes are different than the 4.


Here's a correct caclculator:

http://samengstrom.com/nxl/2020/6_band_resistor_color_code_page.en.html

Geoff.

Thanks Geoff. I bookmarked it.