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Old 18th January 2013, 09:03 PM   #11
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so, its a known issue, but not fatal? do you know how long the bug has been known about?
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Old 18th January 2013, 09:13 PM   #12
ODougbo is offline ODougbo  United States
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Yikes!

I very happy with the purchase of the VC6243+

Cost the same as ONE 2.OmH 14g Erse coil.
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Old 18th January 2013, 09:15 PM   #13
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Quote:
Originally Posted by linuxworks View Post
so, its a known issue, but not fatal? do you know how long the bug has been known about?

Not very long, the first reports of it that I have seen are in late november of last year. Mind you this is when its first discovered, not when Mastech first becomse aware of it. That likely comes later as people start confirming the issue and then it comes to mastech's notice. So the bug is a relatively new discovery.
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Old 18th January 2013, 09:17 PM   #14
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sigh.

how disappointing. oh well. "don't use the psu".

good thing I have a supply of eneloops.
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Old 18th January 2013, 09:46 PM   #15
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Quote:
Originally Posted by ODougbo View Post
Yikes!

I very happy with the purchase of the VC6243+

Cost the same as ONE 2.OmH 14g Erse coil.
If you want to know the ACTUAL inductance of a device then the VC6243+ is not going to cut it. The VC6243+ class of device is going to give you a rough ballpark value for the inductance at a single frequency, ~200hz, but nothing more than that. It is more or less the LCR equivalent to the $5 Harbor Freight DMM. That being said, if all you need is a ballpark measurement (or a relative measurement to other inductors) then this meter is for you. If you need real values then you need to spend more. If this meter class is all you need then there is nothing wrong with that, get one of these. I am a big proponent of paying for what you need, not necessarily getting the most popular device. For example, I very happily own a UT61E DMM. I know my needs and I know its features and drawbacks. The UT61E works perfectly for me. It does everything I need it to and I keep aware of the drawbacks when using it. It's a great meter in that it meets all of its abitious specs (and exceeds them actually) at a great price but it isn't a Fluke 87-V, 289, etc. I knew this going in and those meters are overkill for me in general anyways so I didn't bother spending the premium to get one.

I apologize if it sounds like I'm crapping on your device because I'm not. I'm just stating the facts. Additionally, there is one more thing I feel I would be remiss if I didn't address. I wouldn't trust ANYTHING from Victor (note the starting VC in the model number). There are a lot of budget meter makers out there and Victor is one of the worst of the worst. Its recognized as being a crap maker even by its own people (chinese buyers). Chinese hobbyists, who because of limited funds are relegated to off-brands won't trust Victor. They tend to way overstate their specs (most other makers at least meet their specs), have bad input protection even by chinese standards and shoddy workmanship. While other low budget manufacturers are hit or miss (for example Uni-T hand held meters: good to great in general with some exceptions, benchtop meters: freaking rubbish), victor tends to be universally bad.

Quote:
Originally Posted by linuxworks View Post
sigh.

how disappointing. oh well. "don't use the psu".

good thing I have a supply of eneloops.
Some users have reported good results using an aftermarket power supply.
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Old 22nd January 2013, 07:03 AM   #16
ODougbo is offline ODougbo  United States
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That bad aye, sounds like the equipment I've picked up at M*M, everything I ever bought there has gone bad. E.g a Unbal converter, 2 channel that somehow went 1 channel (so weird it was funny).
The little Victor work fine yesterday, can downsize coils quickly, I was surprised that a 1/2 of turn of wire would change value (how good do you have to be?).
The Victor was only $36 with free ship, it did work better than I thought it would.

Harbor Freight has something for $5.00 I may look for that.

Thanks PedroD
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Old 22nd January 2013, 02:00 PM   #17
oshifis is online now oshifis  Hungary
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There is no such thing as 1/2 turn
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Old 19th February 2013, 08:20 AM   #18
ODougbo is offline ODougbo  United States
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How did I get by without this........Copper and GAS!!! What's going on $$$$

Been hanging to a pair of 5.5mh 14g but was able to rewind them to smaller spools and make up 2 - 1.5mh. (about 6' piece of wire left over)

Once in a while.......
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Last edited by ODougbo; 19th February 2013 at 08:23 AM.
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Old 19th February 2013, 09:14 AM   #19
JMFahey is online now JMFahey  Argentina
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Quote:
Originally Posted by oshifis View Post
There is no such thing as 1/2 turn
Yes there is.
Very much used in UHF transmitters or receivers.

Sometimes referred to as "U" turn or "U" coil, for obvious reasons.

Just cut and pasted from UHF schematics and datasheets:
Quote:
I have not specified the length of the stripline transformers in the amplier part of the circuit. These can be 1/2 turn of 12mm coil, center tapped for band 5 UHF. 1 turn center tapped for lower UHF.
or
Quote:
**L1 6 turns, (approx. depends upon circuit layout) AWG #24
enameled copper wire, close wound on 7/32, ceramic coil
form. Tuning provided by an aluminum slug.
**L2 1 turn, AWG #16 enameled copper wire, 3/8, I.D.
(AIR CORE).
**L3 1/2 turn, AWG #16 enameled copper wire, 1/4, I.D.
(AIR CORE).
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Old 20th February 2013, 01:12 AM   #20
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Its worth spending a bit of money on an inductance meter as low cost ones can be inaccurate.

I worked on a SMPS design with a transformer where the leakage inductance was required to be a set value 120uH. My LC meter said it was 10uH and a USB LC meter said it was 60uH.
When I measured the resonant frequency with a capacitor, sig gen and a scope to get the inductance I found it was 128uH.

It depends how accurate you want to be.
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