New System in Italy have a machine based on a flying grid. This machine has
one top and one bottom grid with 80 probes pluss one top and one bottom
grid with 16 probes. The test area is 590 x 460 mm, and they say that
typical distanse for moving to next testpoint is 1mm. This makes the
machine very fast (around 10 min for 10000 testpoints). Do anyone have any
experience whith this machine ?

Can You please tell me the name on the english machine that looks
interesting.
----------
> From: David Hoover <[log in to unmask]>
> To: 'Tech Net' <[log in to unmask]>
> Subject: FAB:Re: re: test: FLYING PROBE VS. HARD TOOLING
> Date: 14. desember 1996 04:05
> 
> Josh,
> 
> Good answer. I agree completely. One thing I'd like to mention is
> that for ultra fine pitch (CSP, UFP, FC...etc.) as the circuit density
> increases and the circuit width decrease (even in length) the flying
> probe attributes test with one of the variables being capacitance.
> The probe touches down and charges the trace. Now touch again
> and detect the pF value. An exercise (I mean an EXERCISE!) I
> have been through (a couple of times mind you) is that micro shorts
> were not detected by two microtraces shorted. Maybe the 
> threshold/tolerance of the equipment just couldn't cut it. Had to go
> to full blown point to point (with all net close proximity) testing.
> Too 2 wks to test 24 12X18 panels at 24 up. .002/.002 technology.
> Maybe the testers have been upgraded within the last yr. I dunno.
> There is some new ones out since then.
> looks interesting. Until someone can prove different, I'll stick to
> double density 2 fixture (point to point, pitch short to point) and
> intensive AOI with reflective and flouressive in 1/10 mil res.
> 
> My .02 cents.
> 
> Have a happy Holidays
> 
> [log in to unmask]
>   
> 
> ===================================================
> Date: Thu, 12 Dec 96 14:12:37 PST
> From: <[log in to unmask]> (Josh Moody)
> To: <[log in to unmask]>
> Subject: re: test: FLYING PROBE VS. HARD TOOLING
> Message-Id: <[log in to unmask]>
> Content-Type: text/plain;
>                charset=US-ASCII
> 
> The biggest difference from a pure manufacturing standpoint is that
> flying probe testing takes alot of time, based on my experience
> about 70 minutes per board (assume 7500 test points per board).
> The benefits are that the customer does not need to pay for a fixture,
> therefore for prototypes it is the best way to go.  The machines
> are somewhat spendy ($300K-$400K) and require the user to be well
> trained.  From PCB consumer standpoint they are a great addition to
> the world of electrical test (usually costing is done on a test point 
> basis - ie one test point costs $0.04).  Another side benefit is the 
> ability to test finer pitch devices, PCB manufacture of 10mil pitch
> has really pushed traditional ET methods into a corner.  The more 
> expensive flying probe are able to do 10mil pitch.  Anyway that is my 
> opinion  
> 
> Regards,
> Josh Moody
> Process Engineer
> Merix Corp.
> 
> 
> 
>
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