Today's Message Index:
----------------------
1. 11:51 AM - Extra insulation (Bill Naumuk)
2. 03:56 PM - 601HDS - VDO Senders in LE Tanks (checking Ohm) (Hodges, Mitch)
3. 04:24 PM - Re: 601HDS - VDO Senders in LE Tanks (checking Ohm) (Jim Belcher)
4. 05:49 PM - Re: 601HDS - VDO Senders in LE Tanks (checking Ohm) (Hodges, Mitch)
5. 07:37 PM - Re: Extra insulation (Elden Jacobson)
6. 08:08 PM - Re: 601HDS - VDO Senders in LE Tanks (checking Ohm) (Gary Ray)
Message 1
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| Subject: | Extra insulation |
All-
Wound up with enough extra 1/2" insulation to do both sides of a
firewall. 3.5' x4.5', Wicks #SP-500, will take $20 + shipping. Look it
up.
Originally came unfolded in a 5' tall box. if you don't mind
folding it we can ship USPS for 1/2 the cost. If not, I have the
original box. Take it from me- folding is no big deal.
Bill Naumuk
Townville, Pa.
HDS N601MG/Corvair 95%
Message 2
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| Subject: | 601HDS - VDO Senders in LE Tanks (checking Ohm) |
Just getting ready to put the sender in the LE tank on the left wing of my
HDS. Following the instructions, I've done the bend, etc. Now I'm trying
to test the sender's Ohm readings. Unfortunately, what I get are readings
that bounces all over the place and never settles down anywhere close.
Now, being somewhat less than a daily user of a multimeter (I think I've
used one once before, and not sure I was successful then) it is very
possible its user error, so I thought maybe someone could verify I'm doing
this correctly.
I have an ACTRON CP7672 multimeter
http://www.actron.com/publish/2004/06/07/pdf_english_16157.pdf. It is set
to to 2000 on the Ohm/Resistance scale), although I've tried the others.
The Red lead is plugged into the V(OHm)A plug, and the black lead is plugged
into the COM plug. I touch both leads to the terminal on the sender, but
not to each other. At both the Full and Empty settings, I get just a wide
swing in but no reading close to what it should be (although they do pop up
in the seemingly random numbers generated).
So, bad sender, bad method or bad user?
Thanks,
Mitch Hodges
N601MH - Wings under Perpetual Construction
http://www.hodges.aero
Message 3
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| Subject: | Re: 601HDS - VDO Senders in LE Tanks (checking Ohm) |
On Sunday 20 September 2009 17:55, Hodges, Mitch wrote:
> Just getting ready to put the sender in the LE tank on the left wing of my
> HDS. Following the instructions, I've done the bend, etc. Now I'm trying
> to test the sender's Ohm readings. Unfortunately, what I get are readings
> that bounces all over the place and never settles down anywhere close.
Which suggests either a faulty sender or a faulty measurement.
Don't trust touching the leads to the terminals. Get some clip leads, with
alligator clips on the ends. Clip one end to a terminal, and the other to the
multimeter for each lead.
If it still bounces around, you probably have a bad sender. If not, trying
moving the float up and down. The resistance should change, without wild
fluctuations.
You can also try connecting the two multimeter leads together, and see if you
get a zero reading.
Assuming your VDO sender is similar to the one used in the XL, 2000 is much
too high a setting. It seems to me the XL senders are in the neighborhood of
70 ohms. A setting of 100 or 200 ophms would be closer to the ballpark.
--
============================================
Do not archive.
============================================
Jim B Belcher
BS, MS Physics, Math, Computer Science
A&P/IA
Retired aerospace technical manager
Happiness is a belt-fed weapon
============================================
Message 4
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| Subject: | 601HDS - VDO Senders in LE Tanks (checking Ohm) |
Thanks Jim, I'll try the alligator clips, that may do it. Also, I meant 200,
not 2000 on the setting.
I do notice that even when I just touch the probs together I'm getting some
fluctuation. I'm going to take it into work tomorrow to have someone with
more experience than me try it.
Mitch
-----Original Message-----
From: owner-zenith-list-server@matronics.com
[mailto:owner-zenith-list-server@matronics.com] On Behalf Of Jim Belcher
Sent: Sunday, September 20, 2009 7:26 PM
Subject: Re: Zenith-List: 601HDS - VDO Senders in LE Tanks (checking Ohm)
--> <z601a@anemicaardvark.com>
On Sunday 20 September 2009 17:55, Hodges, Mitch wrote:
> Just getting ready to put the sender in the LE tank on the left wing
> of my HDS. Following the instructions, I've done the bend, etc. Now
> I'm trying to test the sender's Ohm readings. Unfortunately, what I
> get are readings that bounces all over the place and never settles down
anywhere close.
Which suggests either a faulty sender or a faulty measurement.
Don't trust touching the leads to the terminals. Get some clip leads, with
alligator clips on the ends. Clip one end to a terminal, and the other to
the multimeter for each lead.
If it still bounces around, you probably have a bad sender. If not, trying
moving the float up and down. The resistance should change, without wild
fluctuations.
You can also try connecting the two multimeter leads together, and see if
you get a zero reading.
Assuming your VDO sender is similar to the one used in the XL, 2000 is much
too high a setting. It seems to me the XL senders are in the neighborhood of
70 ohms. A setting of 100 or 200 ophms would be closer to the ballpark.
--
============================================
Do not archive.
============================================
Jim B Belcher
BS, MS Physics, Math, Computer Science
A&P/IA
Retired aerospace technical manager
Happiness is a belt-fed weapon
============================================
Message 5
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| Subject: | Re: Extra insulation |
If it's not already gone, Bill, I'd like to have it.
-
Elden Jacobson
--- On Mon, 9/21/09, Bill Naumuk <naumuk@windstream.net> wrote:
From: Bill Naumuk <naumuk@windstream.net>
Subject: Zenith-List: Extra insulation
All-
--- Wound up with enough extra 1/2" insulation to do both sides of a
firewall. 3.5' x4.5', Wicks #SP-500, will take $20 + shipping. Look it up.
--- -Originally came unfolded in a 5' tall box. if you don't mind f
olding it we can ship USPS for 1/2 the cost. If not, I have the original bo
x. Take it from me- folding is no big deal.
-
Bill Naumuk
Townville, Pa.
HDS N601MG/Corvair 95%
=0A=0A=0A
Message 6
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| Subject: | Re: 601HDS - VDO Senders in LE Tanks (checking Ohm) |
Mitch
For practice and checking the function of your meter, try measuring
several resistors with a known value. The meter should read very close
without fluctuations.
If you get the expected value with fluctuation higher you probably have
a loose wire connection in one of your test leads.
The VDO senders should read between 10 and 180 ohms(Empty-Full).
Also, Practice voltage readings on batteries etc. to gain experience.
One more point for later, a broken wire or corroded connection from the
VDO sender to the instrument panel fuel gauge will be a higher
resistance than 180 ohms which causes the fuel gauge to show a very full
tank indication when you actually have much less fuel in the tank. Ten
ohms is an empty tank, 180 ohms is a full tank, and anything causing
resistance above 180 ohms will show a very full tank.
For this reason be sure to visually check your tanks before flight and
observe that the gauges are in agreement with the visual.
Gary Ray
davgray@sbcglobal.net
----- Original Message -----
From: Hodges, Mitch
To: zenith-list@matronics.com
Sent: Sunday, September 20, 2009 6:55 PM
Subject: Zenith-List: 601HDS - VDO Senders in LE Tanks (checking Ohm)
Just getting ready to put the sender in the LE tank on the left wing
of my HDS. Following the instructions, I've done the bend, etc. Now
I'm trying to test the sender's Ohm readings. Unfortunately, what I get
are readings that bounces all over the place and never settles down
anywhere close.
Now, being somewhat less than a daily user of a multimeter (I think
I've used one once before, and not sure I was successful then) it is
very possible its user error, so I thought maybe someone could verify
I'm doing this correctly.
I have an ACTRON CP7672 multimeter
http://www.actron.com/publish/2004/06/07/pdf_english_16157.pdf. It is
set to to 2000 on the Ohm/Resistance scale), although I've tried the
others.
The Red lead is plugged into the V(OHm)A plug, and the black lead is
plugged into the COM plug. I touch both leads to the terminal on the
sender, but not to each other. At both the Full and Empty settings, I
get just a wide swing in but no reading close to what it should be
(although they do pop up in the seemingly random numbers generated).
So, bad sender, bad method or bad user?
Thanks,
Mitch Hodges
N601MH - Wings under Perpetual Construction
http://www.hodges.aero
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