*Help!* Crazy Tailcap Readings...Excel XL830L

34 posts / 0 new
Last post

Pages

tallboybass
tallboybass's picture
Offline
Last seen: 2 years 8 months ago
Joined: 05/23/2013 - 17:58
Posts: 1049
Location: Tulsa, OK - USA
*Help!* Crazy Tailcap Readings...Excel XL830L

Hi, my XL830L was reading very low…. .8A for a tailcap reading on an XML2 C12…so I went to Radio Shack and spent nearly as much as the meter cost for banana plugs and made my own leads with good wire (maybe 12 or 14 gauge). NOW it’s reading as high as 5A with an AW IMR battery! With a Sanyo 2600 it’s about 3.39A. Does any of this make sense?

I read somewhere that with a low battery you might get high readings so I put a new battery in there, same thing.

Thanks!
Alan

Tom E
Tom E's picture
Offline
Last seen: 2 hours 43 min ago
Joined: 08/19/2012 - 08:23
Posts: 14912
Location: LI NY

Yes, with a direct drive driver. Direct drive makes those stock lights look good! Smile For a while, anyway... I've seen readings go over 6A. Think my stock LightMalls C8 XML U2 did that, way back...

So that's an XM-L2 on an aluminum star I suppose? Copper stars drive up Vf more...

tallboybass
tallboybass's picture
Offline
Last seen: 2 years 8 months ago
Joined: 05/23/2013 - 17:58
Posts: 1049
Location: Tulsa, OK - USA

Shoot, what’s it going to do with 20R’s in there!

And yes, I’m sure it must be aluminum.

I checked my Convoy S3 with a Nanjg 105C 2.8A driver and it’s hitting around 3.3A…you sure that’s OK?

BIGWOOD
BIGWOOD's picture
Offline
Last seen: 1 year 4 days ago
Joined: 11/17/2011 - 16:16
Posts: 702
Location: Vancouver, BC

tallboybass wrote:
Shoot, what's it going to do with 20R's in there! And yes, I'm sure it must be aluminum. I checked my Convoy S3 with a Nanjg 105C 2.8A driver and it's hitting around 3.3A...you sure that's OK?

 

Getting measurements of 3.3A on a 2.8A linear driver?  Something wrong there.  It should be lower not higher.

Tom E
Tom E's picture
Offline
Last seen: 2 hours 43 min ago
Joined: 08/19/2012 - 08:23
Posts: 14912
Location: LI NY

I am sure that's not ok -- Undecided. Now that's making no sense for sure... My $12-$15 DMM is going on a year now and works great, the UNI-T UT33D model, but I did buy a better model from FT: UNI-T UT50B. What's nice bout the 50B is it shuts off automatically because I constantly seem to leave things on...

tallboybass
tallboybass's picture
Offline
Last seen: 2 years 8 months ago
Joined: 05/23/2013 - 17:58
Posts: 1049
Location: Tulsa, OK - USA

I didn’t think so…wonder if there’s any way to calibrate it? We know about what a 2.8A driver should do, right?

I’ve got a tiny little pocket-sized meter that’s 20 years old and it seems to be spot on AFAIK, but it doesn’t do current.

Tom E
Tom E's picture
Offline
Last seen: 2 hours 43 min ago
Joined: 08/19/2012 - 08:23
Posts: 14912
Location: LI NY

With 2.8A's, I read really close to it, maybe 2.85 or 2.88A at tops. the 350 7135's can get higher readings, 380's usually lower. 3.3A is out there. Seem to recall someone seeing or talking about a similar issue... Dunno...

moderator007
moderator007's picture
Offline
Last seen: 1 month 2 weeks ago
Joined: 12/23/2012 - 04:47
Posts: 3740
Location: North Carolina

tallboybass wrote:
I didn’t think so…wonder if there’s any way to calibrate it? We know about what a 2.8A driver should do, right?

I’ve got a tiny little pocket-sized meter that’s 20 years old and it seems to be spot on AFAIK, but it doesn’t do current.


Hows the voltage reading from a known voltage. Is it off also?
moderator007
moderator007's picture
Offline
Last seen: 1 month 2 weeks ago
Joined: 12/23/2012 - 04:47
Posts: 3740
Location: North Carolina

Turning that little pot will change the voltage reading for calibration on a cheap harbor freight DMM.
.

.
.

I have been told that all meters should contain the pot for calibration of voltage. I don’t know that the current can be calibrated on this model. What meter are you using?
Update: Well there it is in the thread title, how did I miss that? :~
http://www.petervis.com/meters/XIOLE_XL830L/XIOLE_XL830L_Inside_View.html
Should be that little yellow and white pot in the link.
.
To calibrate the meter you will either need a known accurate meter to check against or a voltage standard.
http://www.voltagestandard.com/DMMCheck.html

bdiddle
Offline
Last seen: 3 days 15 hours ago
Joined: 12/14/2012 - 14:36
Posts: 814

Never seen a 2.8 driver read more than 2.98ish. The AMC7135’s typically allow more than 350ma each.

Newb

dchomak
Offline
Last seen: 3 years 5 months ago
Joined: 03/17/2012 - 20:10
Posts: 4122
Location: Connecticut
ryansoh3
ryansoh3's picture
Offline
Last seen: 10 months 5 days ago
Joined: 08/04/2012 - 08:21
Posts: 3890
Location: US

There was a thread about a DMM giving weird readings, and it ultimately was caused by a depleted DMM battery.

BLF ≠ B-grade Flashlight Forum

 

FmC
FmC's picture
Offline
Last seen: 9 months 4 days ago
Joined: 03/31/2013 - 05:23
Posts: 2197
Location: Brisbane, AU

Yep, put a fresh battery in it.

I got caught out at work earlier this week – replaced a faulty alternator in a car, & the new one tested at ~17 volts. I thought it had a faulty regulator, replaced it with another unit, same reading…… turned out my work multimeter battery was getting flat…… Oops

tallboybass
tallboybass's picture
Offline
Last seen: 2 years 8 months ago
Joined: 05/23/2013 - 17:58
Posts: 1049
Location: Tulsa, OK - USA

New battery was the first thing I did if you read the OP.

garrybunk
garrybunk's picture
Offline
Last seen: 1 day 3 hours ago
Joined: 10/31/2011 - 09:25
Posts: 6099
Location: Johnstown, PA

My old Elenco meter is giving voltage readings about 0.10v too high (at least at around 4 to 6 volts) and gives too high of current readings.  Thread I posted about current here.  I never fixed it.  I just replaced it (although I find myself using it and forgetting the voltage readings are a little high).  There are quite a few pots inside mine. 

My XL-830L has proven good though with thick leads (I posted my test in the original T-Mart deal thread dchomak linked). 

I'd suggest always trying to test your meter / leads with a Nanjg driver and fresh battery since you know what you should be reading.

-Garry

My Bike Lights Thread, Optics (TIR) Comparison Beamshots, Diffusion Techniques

, MTBR’s Lights & Night Riding Forum
NOTE: Now hosting my photos from my Google account. Post up if you can’t see them. Older photos hosted on Photobucket or Flickr may disappear (PM me if you want access to them).
tallboybass
tallboybass's picture
Offline
Last seen: 2 years 8 months ago
Joined: 05/23/2013 - 17:58
Posts: 1049
Location: Tulsa, OK - USA

Garry, what do you get when checking your Nanjg for current?

So, the way you calibrate these babies is…“throw it out and get a good meter?” I like it. Wink

garrybunk
garrybunk's picture
Offline
Last seen: 1 day 3 hours ago
Joined: 10/31/2011 - 09:25
Posts: 6099
Location: Johnstown, PA

Post #65 in that thread.  I was getting 2.05A on a 2.1A Nanjg (6x7135's) which matched my 2.051 on my "good meter", both with short thick 12ga leads. 

-Garry

My Bike Lights Thread, Optics (TIR) Comparison Beamshots, Diffusion Techniques

, MTBR’s Lights & Night Riding Forum
NOTE: Now hosting my photos from my Google account. Post up if you can’t see them. Older photos hosted on Photobucket or Flickr may disappear (PM me if you want access to them).
tallboybass
tallboybass's picture
Offline
Last seen: 2 years 8 months ago
Joined: 05/23/2013 - 17:58
Posts: 1049
Location: Tulsa, OK - USA

Ah, thanks. I think my meter might be a return…it had a battery already in it (plus another wrapped battery) and there was a crack in the protective cover. This was also the second one they sent out, first one didn’t make it here.

Great deal….“Two 9v batteries for $5.94!!”….comes with piece o’ plastic cr@p meter. Sad

garrybunk
garrybunk's picture
Offline
Last seen: 1 day 3 hours ago
Joined: 10/31/2011 - 09:25
Posts: 6099
Location: Johnstown, PA

I'd recommend taking a step up in meter quality, especially if this will be your only meter. 

-Garry

My Bike Lights Thread, Optics (TIR) Comparison Beamshots, Diffusion Techniques

, MTBR’s Lights & Night Riding Forum
NOTE: Now hosting my photos from my Google account. Post up if you can’t see them. Older photos hosted on Photobucket or Flickr may disappear (PM me if you want access to them).
tallboybass
tallboybass's picture
Offline
Last seen: 2 years 8 months ago
Joined: 05/23/2013 - 17:58
Posts: 1049
Location: Tulsa, OK - USA

garrybunk wrote:

I’d recommend taking a step up in meter quality, especially if this will be your only meter. 

-Garry


I think that is good advice!

Really, my old pocket-sized Radio Shack meter has been rock-solid for over 20 years, but it doesn’t do current.

I’m going to poke around in the Excel and see about calibrating it with a known source…

garrybunk
garrybunk's picture
Offline
Last seen: 1 day 3 hours ago
Joined: 10/31/2011 - 09:25
Posts: 6099
Location: Johnstown, PA

Some very quick recommendations on another meter:

Equus 3320 (thinking it might even be at some Walmarts): $18.74 at Amazon.

Here's a Mastech MS8268 which seems identical to my "good one" but without the lux meter (not sure how good it is anyway) and without temp/humidty (who needs that anyway): $24 at Amazon. My Mastech has a bit of a cheap feel to it (and the probe sockets don't lock the probes in so tight), but it functions well (get what you pay for I guess). 

-Garry

My Bike Lights Thread, Optics (TIR) Comparison Beamshots, Diffusion Techniques

, MTBR’s Lights & Night Riding Forum
NOTE: Now hosting my photos from my Google account. Post up if you can’t see them. Older photos hosted on Photobucket or Flickr may disappear (PM me if you want access to them).
tallboybass
tallboybass's picture
Offline
Last seen: 2 years 8 months ago
Joined: 05/23/2013 - 17:58
Posts: 1049
Location: Tulsa, OK - USA

Thanks for the recommends!

After messing with the calibration pot inside this meter, I’m convinced this one is rubbish. I couldn’t even get it close to what it should read on a 2.8A Nanjg.

At least I got some good leads made for when a proper meter comes along!

tallboybass
tallboybass's picture
Offline
Last seen: 2 years 8 months ago
Joined: 05/23/2013 - 17:58
Posts: 1049
Location: Tulsa, OK - USA

I ordered the Mastech from Amazon as well as some helping hands.

dchomak
Offline
Last seen: 3 years 5 months ago
Joined: 03/17/2012 - 20:10
Posts: 4122
Location: Connecticut

“Back in the day” a VTVM was a rare item, not just anyone had one – but I did. Mid 60’s, this one cost $39.95 and it was a KIT. You had to put it together, all point to point wiring!

And note there is no Amp scale.
This next one also came in kit form and cost $69.95, a for real DMM – from the mid 70’s
Sabtronics Model 2000

Back in the 60’s, $39.95 was a LOT of money! It is because of that, I am happy to use a cheap Harbor Freight meter and not complain. Relatively speaking, a bargain, and more accurate than either of these 2. That is also why I can’t help buying meters, they all seem so inexpensive.

EDIT: I plan on restoring these 2 and get them up and running.
Speaking of calibration, in the directions for the EICO VTVM, the calibration procedure was to plug the probes into a US AC outlet and adjust for 117V. The DC calibration was connect to a fresh Carbon-Zinc D cell and adjust to 1.65V!
And that was it!
The ohms adjust was just under the meter face, you can see it in the pic, and had to be constantly adjusted as the Vacuum Tubes heated up.
God I feel old!

garrybunk
garrybunk's picture
Offline
Last seen: 1 day 3 hours ago
Joined: 10/31/2011 - 09:25
Posts: 6099
Location: Johnstown, PA

I used to have an old US Army analog meter.  My dad brought me home a couple years ago as a teenager and I kept the best one (well last I knew I left it at my parents house).  No idea how old it was.  It was in a big heavy case where the front unlatched and came off.  Very large case with just a small analog meter in the center.  Here is an ebay listing for one that looks like I remember.  I'll have to see if my parents still have it and if I can get it (just to keep it).

Pics from that Ebay listing:

1

1

Glad I'm not using that thing anymore!!

My Bike Lights Thread, Optics (TIR) Comparison Beamshots, Diffusion Techniques

, MTBR’s Lights & Night Riding Forum
NOTE: Now hosting my photos from my Google account. Post up if you can’t see them. Older photos hosted on Photobucket or Flickr may disappear (PM me if you want access to them).
moderator007
moderator007's picture
Offline
Last seen: 1 month 2 weeks ago
Joined: 12/23/2012 - 04:47
Posts: 3740
Location: North Carolina

I have a Mastech MS8229. Reads very comparable to my 87V. Seems to be a very good low cost meter.
The only thing I could complain about is it will not work outside in the sun. The screen will completely black out, if left in the sun more than a few minutes. Temperatures outside where in the 70’s incase your wondering. Once it cools back down the screen will start to come back. The 87V had no problem dealing with the outside sun, had to go fetch it once the Mastech blacked out. I would not recommend the MS8229 to anyone who intends to use it outside. Sad
I do think the Mastech is definitely a step up from what you had.

garrybunk
garrybunk's picture
Offline
Last seen: 1 day 3 hours ago
Joined: 10/31/2011 - 09:25
Posts: 6099
Location: Johnstown, PA

My "Mastech" is the Harbor Freight "Centech" branded one found here.  Seems to be a Mastech MS8229.  I'm not sure if I've ever used it outside to be honest.  (Also not sure if I've ever used a DMM outside at all.)  So I've not experienced any screen issues, but it could just be that I've not used it outside.

-Garry

My Bike Lights Thread, Optics (TIR) Comparison Beamshots, Diffusion Techniques

, MTBR’s Lights & Night Riding Forum
NOTE: Now hosting my photos from my Google account. Post up if you can’t see them. Older photos hosted on Photobucket or Flickr may disappear (PM me if you want access to them).
dchomak
Offline
Last seen: 3 years 5 months ago
Joined: 03/17/2012 - 20:10
Posts: 4122
Location: Connecticut

Garry, another thing some do not realize, is that an old, analog mechanical meter like yours had such a low internal impedance that they could “load” a circuit and thereby not give accurate readings. That’s why a VTVM (vacuum tube volt meter” was an “elite” piece of test equipment. Another reason I appreciate so much the newer meters. Even the cheap, cheap ones.

One more thing, any meter, no matter the cost is only as good as it’s calibration.

moderator007
moderator007's picture
Offline
Last seen: 1 month 2 weeks ago
Joined: 12/23/2012 - 04:47
Posts: 3740
Location: North Carolina

garrybunk wrote:

My “Mastech” is the Harbor Freight “Centech” branded one found here.  Seems to be a Mastech MS8229.  I’m not sure if I’ve ever used it outside to be honest.  (Also not sure if I’ve ever used a DMM outside at all.)  So I’ve not experienced any screen issues, but it could just be that I’ve not used it outside.

-Garry


I would not have thought, I would have ever used mine outside either. My air conditioner quit this spring, so I went out to check the capacitance of the run capacitor in the outside unit. That’s when she blacked out while I was removing a panel to gain access. No more than a few minutes had went by. Had to go get the fluke. Sure enough the capacitor was bad. Saved myself a expensive visit from a AC man I’am sure. Run capacitor cost me 15 bucks and has been working fine ever since. :bigsmile:
garrybunk
garrybunk's picture
Offline
Last seen: 1 day 3 hours ago
Joined: 10/31/2011 - 09:25
Posts: 6099
Location: Johnstown, PA

moderator007 wrote:
. . .My air conditioner quit this spring. . .

Now that's something that would NEVER happen around here! Smile (i.e. running an air conditioner in the spring).  We only have two seasons here, winter and winter is coming.

-Garry

My Bike Lights Thread, Optics (TIR) Comparison Beamshots, Diffusion Techniques

, MTBR’s Lights & Night Riding Forum
NOTE: Now hosting my photos from my Google account. Post up if you can’t see them. Older photos hosted on Photobucket or Flickr may disappear (PM me if you want access to them).
moderator007
moderator007's picture
Offline
Last seen: 1 month 2 weeks ago
Joined: 12/23/2012 - 04:47
Posts: 3740
Location: North Carolina

garrybunk wrote:

moderator007 wrote:
. . .My air conditioner quit this spring. . .

Now that’s something that would NEVER happen around here! Smile (i.e. running an air conditioner in the spring).  We only have two seasons here, winter and winter is coming.

-Garry


If you lived where I do and had a significant other. You would have a air condition or no significant other. :bigsmile:

Pages