TENMA 72-3155 LCR meter

[William Sommerwerck]

MCM had this on sale for $40. In the middle of Advent Speaker restoration, and
not having an inductance meter, I splurged.

I was frankly surprised, especially after reading a (basically favorable)
review in which the reviewer made the not-unreasonable complaint that the test
frequency was too low. (The unit measures the inductor's impedance, then
mathematically removes its resistance. The higher the frequency, the less
effect errors in the resistance reading have.)

I measured two precision Alpha-Core air-core inductors I'd bought for the
Advent. The test leads measured 4 to 5 uH. After subtracting the test leads'
inductance...

The 0.47mH inductor measured 0.475mH.

The 1.5mH inductor measured 1.527mH.

The spec'd accuracy on the 2mH range is 2%, +/- 8 digits. So (assuming
Alpha-Core has much-better meters), that's not bad.

 

[William Sommerwerck]

Whoops. Wrong model number. It's 72-8155.

 

[William Sommerwerck]

"RobertMacy" wrote in message newsp.xkk4zfzm2cx0wh@ajm...

How does that compare to the relatively 'free' version of
Bob Masta's, DAQARTA, LCR Meter using your soundcard?

I don't know. I don't own it.

 

[RobertMacy]

On Thu, 14 Aug 2014 05:21:04 -0700, William Sommerwerck
<grizzledgeezer@comcast.net> wrote:

MCM had this on sale for $40. In the middle of Advent Speaker
restoration, and not having an inductance meter, I splurged.

I was frankly surprised, especially after reading a (basically
favorable) review in which the reviewer made the not-unreasonable
complaint that the test frequency was too low. (The unit measures the
inductor's impedance, then mathematically removes its resistance. The
higher the frequency, the less effect errors in the resistance reading
have.)

I measured two precision Alpha-Core air-core inductors I'd bought for
the Advent. The test leads measured 4 to 5 uH. After subtracting the
test leads' inductance...

The 0.47mH inductor measured 0.475mH.

The 1.5mH inductor measured 1.527mH.

The spec'd accuracy on the 2mH range is 2%, +/- 8 digits. So (assuming
Alpha-Core has much-better meters), that's not bad.

How does that compare to the relatively 'free' version of Bob Masta's,
DAQARTA, LCR Meter using your soundcard?

 

[RobertMacy]

On Thu, 14 Aug 2014 06:55:52 -0700, William Sommerwerck
<grizzledgeezer@comcast.net> wrote:

"RobertMacy" wrote in message newsp.xkk4zfzm2cx0wh@ajm...
How does that compare to the relatively 'free' version of
Bob Masta's, DAQARTA, LCR Meter using your soundcard?

I don't know. I don't own it.

from memory, something like 4MB download, and free TOTAL use for a while,
and some kind of minimal stuff forever.

Actually runs on WinXP [and up, I think] AND Win98. If you never do
anything else with it it makes for a great accurate function generator!
Always use an extra source.