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Thanks. I was taking a SWAG that it was impedance.
On 5/21/2020 10:35 AM, jim wrote:
> symbol on meter settings indicates "diode test" ..Puts a known
> voltage across diode and measures "diode turn on voltage" ie where it
> starts to conduct ..not the same as ohms ...
>
> Jim
>
> On Thursday, May 21, 2020, 8:29:27 AM PDT, Bob Spidell
> <bspidell@comcast.net> wrote:
>
>
> First, why on earth did you have a spark plug lead on a radiator
> cap??? (presume you meant 'distributor' cap?)
>
> It looks like you have your multimeter set to diode test (maybe that's
> how continuity works on your MM?). The reading is probably ohms,
> indicating a very low resistance circuit, but to be sure turn the MM
> control knob one click clockwise, to the 200 ohm range ('200 omega').Â
> It'll probably give the same reading; i.e. .792 ohms, which is about
> what you'd expect from a short stranded copper wire lead (IIRC, one
> ohm per foot of cable is considered normal, even copper has some
> resistance).
>
> Bob
>
>
> On 5/21/2020 7:55 AM, Linwood Rose via Healeys wrote:
> Hi guys,
> Educate me. When doing some preventative maintenance, I pulled a spark
> plug lead out of the radiator cap (using a 123 distributor) the cable
> pulled away from the terminal - not a particularly unusual outcome.
> Got a new 90 degree terminal and crimped it on to the cable (Pertronix
> cable) and before I put the boot on the end of the cable I thought I
> would check the continuity. It barely dropped below 1.
>
> So then I checked a brand new, never used, cable made-up by AH Spares.
> As shown in the image below when the sensors are attached to each end
> of the cable I get a reading of .792 which is not sufficient to even
> sound the beeper on the multimeter device. I suppose there are degrees
> of continuity (not just on/off) but I guess I expected the alarm to
> sound and the reading to drop to near zero.
>
> Could someone interpret these findings for me?
>
> Thanks, as always.
>
> Lin
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Thanks. I was taking a SWAG that it was impedance.<br>
<br>
<div class="moz-cite-prefix">On 5/21/2020 10:35 AM, jim wrote:<br>
</div>
<blockquote type="cite"
cite="mid:369087910.1972963.1590082527663@mail.yahoo.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div class="ydp6f678330yahoo-style-wrap" style="font-family:
Helvetica Neue, Helvetica, Arial, sans-serif; font-size: 13px;">
<div dir="ltr" data-setdir="false">symbol on meter settings
indicates "diode test" ..Puts a known voltage across diode and
measures "diode turn on voltage" ie where it starts to
conduct ..not the same as ohms ...</div>
<div dir="ltr" data-setdir="false"><br>
</div>
<div dir="ltr" data-setdir="false">Jim<br>
</div>
<div><br>
</div>
</div>
<div id="ydp88a2940dyahoo_quoted_0897012119"
class="ydp88a2940dyahoo_quoted">
<div style="font-family:'Helvetica Neue', Helvetica, Arial,
sans-serif;font-size:13px;color:#26282a;">
<div> On Thursday, May 21, 2020, 8:29:27 AM PDT, Bob Spidell
<a class="moz-txt-link-rfc2396E"
href="mailto:bspidell@comcast.net";><bspidell@comcast.net></a> wrote:
</div>
<div><br>
</div>
<div><br>
</div>
<div>
<div id="ydp88a2940dyiv5607545115">
<div> First, why on earth did you have a spark plug lead
on a radiator cap??? (presume you meant 'distributor'
cap?)<br clear="none">
<br clear="none">
It looks like you have your multimeter set to diode test
(maybe that's how continuity works on your MM?). The
reading is probably ohms, indicating a very low
resistance circuit, but to be sure turn the MM control
knob one click clockwise, to the 200 ohm range ('200
omega'). It'll probably give the same reading; i.e.
.792 ohms, which is about what you'd expect from a short
stranded copper wire lead (IIRC, one ohm per foot of
cable is considered normal, even copper has some
resistance).<br clear="none">
<br clear="none">
Bob <br clear="none">
<br clear="none">
<br clear="none">
<div class="ydp88a2940dyiv5607545115yqt2866999372"
id="ydp88a2940dyiv5607545115yqtfd48655">
<div class="ydp88a2940dyiv5607545115moz-cite-prefix">On
5/21/2020 7:55 AM, Linwood Rose via Healeys wrote:<br
clear="none">
</div>
<blockquote type="cite"> </blockquote>
</div>
</div>
<div>
<div class="ydp88a2940dyiv5607545115yqt2866999372"
id="ydp88a2940dyiv5607545115yqtfd04721"> Hi guys,
<div class="ydp88a2940dyiv5607545115">Educate me. When
doing some preventative maintenance, I pulled a
spark plug lead out of the radiator cap (using a 123
distributor) the cable pulled away from the terminal
- not a particularly unusual outcome. Got a new 90
degree terminal and crimped it on to the cable
(Pertronix cable) and before I put the boot on the
end of the cable I thought I would check the
continuity. It barely dropped below 1.</div>
<div class="ydp88a2940dyiv5607545115"><br
class="ydp88a2940dyiv5607545115" clear="none">
</div>
<div class="ydp88a2940dyiv5607545115">So then I
checked a brand new, never used, cable made-up by AH
Spares. As shown in the image below when the sensors
are attached to each end of the cable I get a
reading of .792 which is not sufficient to even
sound the beeper on the multimeter device. I suppose
there are degrees of continuity (not just on/off)
but I guess I expected the alarm to sound and the
reading to drop to near zero.</div>
<div class="ydp88a2940dyiv5607545115"><br
class="ydp88a2940dyiv5607545115" clear="none">
</div>
<div class="ydp88a2940dyiv5607545115">Could someone
interpret these findings for me?</div>
<div class="ydp88a2940dyiv5607545115"><br
class="ydp88a2940dyiv5607545115" clear="none">
</div>
<div class="ydp88a2940dyiv5607545115">Thanks, as
always.</div>
<div class="ydp88a2940dyiv5607545115"><br
class="ydp88a2940dyiv5607545115" clear="none">
</div>
<div class="ydp88a2940dyiv5607545115">Lin<br>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</blockquote>
<br>
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