Ramsey, Fumiaki-San
The Omegameter was sold in several different models, ours does the full
calculations and prints the results on a small slip of paper (like a cash
register), as well as . So no calculators are used in our case.
We have both an Omegameter and an Ionograph. The operators prefer the
Omegameter as being a bit easier to use, the main difference being that our
Ionograph is an early model where the top of the tank is about 6 feet off
the ground, and about 3 feet deep - so some tricks have to be used to get
product in and out of the thing.
The Ionograph is said to be more accurate than the Omegameter, the main
difference (as I understand it anyway) is that the Ionograph uses heated
solution, so it does a better job of removing the residue from the CCA. The
Ionograph is controlled by a separate PC and offers more "bells and
whistles". As well, the unit they currently sell does not have the elevated
tank, so is much easier to use.
Never having seen a Zero-Ion, I can't comment on those.
regards,
Graham Collins
Process Engineer,
Litton Systems Canada, Atlantic Facility
(902) 873-2000 ext 6215
-----Original Message-----
From: Ramsey's [mailto:[log in to unmask]]
Sent: Tuesday, January 18, 2000 8:23 AM
To: [log in to unmask]
Subject: [TN] Omega meter v.s. Zero-ion(ZI-100A)
Alpha Metals sold the Omega Meter 500. Aqueous Technologies sells the
Zero-Ion. The Omega Meter 500 was replaces by technology similar to the
Zero-Ion. The new unit is the Ion-O-graph or something like that.
The Omega Meter and Zero-Ion both use a DI water and Alcohol mixture. 75%
alcohol by volume.
The Omega Meter cleans the test solution to some value greater than 19 Meg
ohms and measures the change in solution resistance over time. The measured
resistance, temperature, and specific gravity of the solution are factors in
a hand calculation to relate the removed contamination to an equivalent
amount of salt per square inch or cm.
The Zero-Ion cleans the test solution to one of two preset resistance
values, 150 Meg ohms or 50 Meg ohms. The unit then measures the time it
takes to return the solution to that resistivity value after a specimen has
been added to the solution. Firmware calculates an equivalent of salt per
surface area for you and prints the result in a number of formats.
The Omega Meter is less sensitive, in my experience. However, the Zero-Ion
can give misleading results because it is so sensitive. There have been
occasions where the Zero-Ion measured outrageous levels of contamination
because it started to extract contaminates from plastics and the solder mask
(especially dry film). The 50 Meg ohm range yields more stable measurements
in these cases.
The Omega Meter requires the user to calculate test results by hand. A
programmable calculator would be needed for most production line workers.
The temperature of the test solution in the Zero Ion increases when used
heavily. The warm test solution is a better solvent than room temperature
test solution. I found that the tests results were slightly different when
the solution was warm. It can give the impression that things are getting
worse, when the test solution is merely getting warm.
The Omega Meter cleans the sample for a set period of time. The time is
selected by the user. The manual suggests five minutes. I found that that
results from the Zero-Ion and the Omega Meter were more alike when the test
was run for 10 to 15 minutes. A test cycle in the Zero-Ion will take from
15 to 40 minutes.
In my opinion, these tools are only useful for setting a benchmark for your
cleaning process. Neither give you an absolute measure of contaminates.
The Zero-Ion is easier for a production worker to use, though it can
mis-lead users because it is very sensitive.
The Omega Meter is not as easy to use. I found its sensitivity satisfactory
for use as a benchmarking tool.
Subject:
Omega meter v.s. Zero-ion(ZI-100A)
Date:
Mon, 17 Jan 2000 16:36:16 +0900
From:
"F.Shigeoka(Ueno-Seiki)" <[log in to unmask]>
I'm looking for test equipment to measure flux residue.
Does anyone know the difference between Omega metaer and Zero-ion ?
---------------------
Fumiaki Shigeoka
[log in to unmask]
Ueno-seiki co.,ltd.
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