I know nothing about this LCR meter by ESI - diyAudio
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Old 31st July 2007, 07:53 AM   #1
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Default I know nothing about this LCR meter by ESI

I picked up an LCR meter made by ESI, model # 410 (1 MHz)
Can't find any info on the net, except that the front panel looks
just like the more common ESI model # 295 or 2522b (1 KHz).

http://www.tucker.com/images/images_spec/00000820.pdf

I believe ESI was bought by Tegam, but their site reveales no match....to either models. I think a manual for 295 might get me up and running with the 410 that I have.


Does anyone know anything about this (these) meters?
Are kelvin clips mandatory?

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Old 31st July 2007, 12:15 PM   #2
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Not a clue. Does it have other frequencies, or just 1MHz? Kelvin clips help accuracy with low impedance loads (most capacitors at 1MHz), but don't do much when lead resistance isn't a factor. They also make it easier to eliminate lead capacitance from the measurement- as long as you're doing a 3 or 4-terminal measurement, you might as well carry it right to the component lead via Kelvin clips. I do a lot of fixturing where the separate shielded leads terminate to a big conventional spring clip for the component lead. Not a Kelvin clip, but plenty close enough for most low frequency applications. Note that you can easily make real Kelvin clips out of simple plastic clothes pins. Just attach some adhesive copper shielding tape (or even wire) to each face of the clip and wire back to the meter. No expensive magic required. Where you really want Kelvin clips is for measuring things like emitter resistors- for anything below about 20-50 ohms, where you want accuracy, they're essential.
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Old 1st August 2007, 12:55 AM   #3
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I have a Teagam LCR bridge that uses Kelvin Klips, etc. Mine has a CRT display and a digital tape drive built in. To operate it you select frequency and measurement mode, then calibrate. Calibration involves allowing the machine to zero itself with the leads shorted and open.

I don't have proper cal standards to check accuracy, but using some precision caps and resistors it appears to be close enough. Resistance measurements match my Fluke 87 type IV meter to 3 decimal digits.

What do you need to know about the unit?

I_F
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Old 1st August 2007, 02:43 PM   #4
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Quote:
What do you need to know about the unit?
Well, it powers up, but with the two led displays are flashing at power up, every time.
(these units can take two different measurements at a time.)

flashing readouts (at power-up):

+8.242, n, Fp

+01.54, m, S, HV

I can reset (zero-out, no blinking) the displays by pressing the 'NOM VALUE' button.
I seem to be able to put it in different modes. Pressing "START' button will always make the readouts flashing again.
I have not yet made clips yet for this yet, so I can't see if it measures anything.

I wonder if the blinking displays indicate a 'completed' measurement????..or if something is wrong...???

(there are some empty card slots inside, maybe for options ?)
I only paid $20 for the unit.

---------------------------------------------------------
BTW, there are 4 BNC inputs labeled:
(HI)
Drive, Sense
(LOW)
Drive, Sense

I think a four wire connection goes like this:
BNC center wires 'drive' and 'sense' are connected together at the kelvin clip.....for each HI and LOW pairs.
BNC shields are tied together for each pair.
Correct??

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Old 1st August 2007, 07:46 PM   #5
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It is probably flashing when you hit the measure button because nothing is connected to measure (i.e. flashing indicates that measurement is out of range).

I think you are right about the wiring of the leads- I'll check mine and see what they look like.

I_F
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Old 2nd August 2007, 04:10 AM   #6
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Like this:
....scroll to midway on this page:

http://www.allaboutcircuits.com/vol_1/chpt_8/9.html

Click the image to open in full size.


But I still wonder..........I've seen kelvin clips being a RED and a BLACK pair.
On this kind of meter, would RED be "High" and BLACK be "Low"?
What is the purpose of a "High" and "Low" anyhow? .....to measure polarized caps?

These types of meters will measure a cap's ESR, correct?

Sorry for the basic questions. I think I'll download some various LCR manuals, and read them.

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Old 18th May 2008, 06:32 AM   #7
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Default ESI 410

Hi, Redrabbit,

recently I've bought an ESI 410....

A lot of problems, probably it's damaged....


I'm searching for the manual and the schematic, but I'm also
interested in the EPROM firmware..


Are You interested to collaborate in order to achieve the full functionality of this (interesting and "misterious") LCR Meter ?


Thanks in advance !

Andrea - Italy
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Old 19th May 2008, 05:23 AM   #8
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I'll try to figure it out again. I have not powered it up for a year or so.
My understanding of measurements is better now.
Keep an eye out for the # 296 meter manual, similar type meter, so probably similar functions.
http://recycledequipment.com/index.c...-lcr-meter.cfm

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Old 1st July 2008, 01:06 AM   #9
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Default ESI 410 Instruction manual

Hi, Redrabbit,

I've bought the copy of a ESI 410 Instruction manual...

If You're interested, I can scan and make a PDF for You...I
need only a few info about Your unit (mine isn't working)..

bye

Andrea
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Old 1st July 2008, 10:46 AM   #10
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Chroma641,
I sent you a message. Thanks !!

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